summaryrefslogtreecommitdiffstats
path: root/netwerk/protocol/http/Http2Session.cpp
blob: 55ddbe908795855ec8b2305e43586599a7378983 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
3524
3525
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537
3538
3539
3540
3541
3542
3543
3544
3545
3546
3547
3548
3549
3550
3551
3552
3553
3554
3555
3556
3557
3558
3559
3560
3561
3562
3563
3564
3565
3566
3567
3568
3569
3570
3571
3572
3573
3574
3575
3576
3577
3578
3579
3580
3581
3582
3583
3584
3585
3586
3587
3588
3589
3590
3591
3592
3593
3594
3595
3596
3597
3598
3599
3600
3601
3602
3603
3604
3605
3606
3607
3608
3609
3610
3611
3612
3613
3614
3615
3616
3617
3618
3619
3620
3621
3622
3623
3624
3625
3626
3627
3628
3629
3630
3631
3632
3633
3634
3635
3636
3637
3638
3639
3640
3641
3642
3643
3644
3645
3646
3647
3648
3649
3650
3651
3652
3653
3654
3655
3656
3657
3658
3659
3660
3661
3662
3663
3664
3665
3666
3667
3668
3669
3670
3671
3672
3673
3674
3675
3676
3677
3678
3679
3680
3681
3682
3683
3684
3685
3686
3687
3688
3689
3690
3691
3692
3693
3694
3695
3696
3697
3698
3699
3700
3701
3702
3703
3704
3705
3706
3707
3708
3709
3710
3711
3712
3713
3714
3715
3716
3717
3718
3719
3720
3721
3722
3723
3724
3725
3726
3727
3728
3729
3730
3731
3732
3733
3734
3735
3736
3737
3738
3739
3740
3741
3742
3743
3744
3745
3746
3747
3748
3749
3750
3751
3752
3753
3754
3755
3756
3757
3758
3759
3760
3761
3762
3763
3764
3765
3766
3767
3768
3769
3770
3771
3772
3773
3774
3775
3776
3777
3778
3779
3780
3781
3782
3783
3784
3785
3786
3787
3788
3789
3790
3791
3792
3793
3794
3795
3796
3797
3798
3799
3800
3801
3802
3803
3804
3805
3806
3807
3808
3809
3810
3811
3812
3813
3814
3815
3816
3817
3818
3819
3820
3821
3822
3823
3824
3825
3826
3827
3828
3829
3830
3831
3832
3833
3834
3835
3836
3837
3838
3839
3840
3841
3842
3843
3844
3845
3846
3847
3848
3849
3850
3851
3852
3853
3854
3855
3856
3857
3858
3859
3860
3861
3862
3863
3864
3865
3866
3867
3868
3869
3870
3871
3872
3873
3874
3875
3876
3877
3878
3879
3880
3881
3882
3883
3884
3885
3886
3887
3888
3889
3890
3891
3892
3893
3894
3895
3896
3897
3898
3899
3900
3901
3902
3903
3904
3905
3906
3907
3908
3909
3910
3911
3912
3913
3914
3915
3916
3917
3918
3919
3920
3921
3922
3923
3924
3925
3926
3927
3928
3929
3930
3931
3932
3933
3934
3935
3936
3937
3938
3939
3940
3941
3942
3943
3944
3945
3946
3947
3948
3949
3950
3951
3952
3953
3954
3955
3956
3957
3958
3959
3960
3961
3962
3963
3964
3965
3966
3967
3968
3969
3970
3971
3972
3973
3974
3975
3976
3977
3978
3979
3980
3981
3982
3983
3984
3985
3986
3987
3988
3989
3990
3991
3992
3993
3994
3995
3996
3997
3998
3999
4000
4001
4002
4003
4004
4005
4006
4007
4008
4009
4010
4011
4012
4013
4014
4015
4016
4017
4018
4019
4020
4021
4022
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set sw=2 ts=8 et tw=80 : */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

// HttpLog.h should generally be included first
#include "HttpLog.h"

// Log on level :5, instead of default :4.
#undef LOG
#define LOG(args) LOG5(args)
#undef LOG_ENABLED
#define LOG_ENABLED() LOG5_ENABLED()

#include <algorithm>

#include "Http2Session.h"
#include "Http2Stream.h"
#include "Http2Push.h"

#include "mozilla/EndianUtils.h"
#include "mozilla/Telemetry.h"
#include "mozilla/Preferences.h"
#include "nsHttp.h"
#include "nsHttpHandler.h"
#include "nsHttpConnection.h"
#include "nsIRequestContext.h"
#include "nsISSLSocketControl.h"
#include "nsISSLStatus.h"
#include "nsISSLStatusProvider.h"
#include "nsISupportsPriority.h"
#include "nsStandardURL.h"
#include "nsURLHelper.h"
#include "prnetdb.h"
#include "sslt.h"
#include "mozilla/Sprintf.h"
#include "nsSocketTransportService2.h"
#include "nsNetUtil.h"

namespace mozilla {
namespace net {

// Http2Session has multiple inheritance of things that implement
// nsISupports, so this magic is taken from nsHttpPipeline that
// implements some of the same abstract classes.
NS_IMPL_ADDREF(Http2Session)
NS_IMPL_RELEASE(Http2Session)
NS_INTERFACE_MAP_BEGIN(Http2Session)
NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsAHttpConnection)
NS_INTERFACE_MAP_END

// "magic" refers to the string that preceeds HTTP/2 on the wire
// to help find any intermediaries speaking an older version of HTTP
const uint8_t Http2Session::kMagicHello[] = {
  0x50, 0x52, 0x49, 0x20, 0x2a, 0x20, 0x48, 0x54,
  0x54, 0x50, 0x2f, 0x32, 0x2e, 0x30, 0x0d, 0x0a,
  0x0d, 0x0a, 0x53, 0x4d, 0x0d, 0x0a, 0x0d, 0x0a
};

#define RETURN_SESSION_ERROR(o,x)  \
do {                             \
  (o)->mGoAwayReason = (x);      \
  return NS_ERROR_ILLEGAL_VALUE; \
  } while (0)

Http2Session::Http2Session(nsISocketTransport *aSocketTransport, uint32_t version, bool attemptingEarlyData)
  : mSocketTransport(aSocketTransport)
  , mSegmentReader(nullptr)
  , mSegmentWriter(nullptr)
  , mNextStreamID(3) // 1 is reserved for Updgrade handshakes
  , mLastPushedID(0)
  , mConcurrentHighWater(0)
  , mDownstreamState(BUFFERING_OPENING_SETTINGS)
  , mInputFrameBufferSize(kDefaultBufferSize)
  , mInputFrameBufferUsed(0)
  , mInputFrameDataSize(0)
  , mInputFrameDataRead(0)
  , mInputFrameFinal(false)
  , mInputFrameType(0)
  , mInputFrameFlags(0)
  , mInputFrameID(0)
  , mPaddingLength(0)
  , mInputFrameDataStream(nullptr)
  , mNeedsCleanup(nullptr)
  , mDownstreamRstReason(NO_HTTP_ERROR)
  , mExpectedHeaderID(0)
  , mExpectedPushPromiseID(0)
  , mContinuedPromiseStream(0)
  , mFlatHTTPResponseHeadersOut(0)
  , mShouldGoAway(false)
  , mClosed(false)
  , mCleanShutdown(false)
  , mTLSProfileConfirmed(false)
  , mGoAwayReason(NO_HTTP_ERROR)
  , mClientGoAwayReason(UNASSIGNED)
  , mPeerGoAwayReason(UNASSIGNED)
  , mGoAwayID(0)
  , mOutgoingGoAwayID(0)
  , mConcurrent(0)
  , mServerPushedResources(0)
  , mServerInitialStreamWindow(kDefaultRwin)
  , mLocalSessionWindow(kDefaultRwin)
  , mServerSessionWindow(kDefaultRwin)
  , mInitialRwin(ASpdySession::kInitialRwin)
  , mOutputQueueSize(kDefaultQueueSize)
  , mOutputQueueUsed(0)
  , mOutputQueueSent(0)
  , mLastReadEpoch(PR_IntervalNow())
  , mPingSentEpoch(0)
  , mPreviousUsed(false)
  , mWaitingForSettingsAck(false)
  , mGoAwayOnPush(false)
  , mUseH2Deps(false)
  , mAttemptingEarlyData(attemptingEarlyData)
{
  MOZ_ASSERT(PR_GetCurrentThread() == gSocketThread);

  static uint64_t sSerial;
  mSerial = ++sSerial;

  LOG3(("Http2Session::Http2Session %p serial=0x%X\n", this, mSerial));

  mInputFrameBuffer = MakeUnique<char[]>(mInputFrameBufferSize);
  mOutputQueueBuffer = MakeUnique<char[]>(mOutputQueueSize);
  mDecompressBuffer.SetCapacity(kDefaultBufferSize);

  mPushAllowance = gHttpHandler->SpdyPushAllowance();
  mInitialRwin = std::max(gHttpHandler->SpdyPullAllowance(), mPushAllowance);
  mMaxConcurrent = gHttpHandler->DefaultSpdyConcurrent();
  mSendingChunkSize = gHttpHandler->SpdySendingChunkSize();
  SendHello();

  mLastDataReadEpoch = mLastReadEpoch;

  mPingThreshold = gHttpHandler->SpdyPingThreshold();
  mPreviousPingThreshold = mPingThreshold;
}

void
Http2Session::Shutdown()
{
  for (auto iter = mStreamTransactionHash.Iter(); !iter.Done(); iter.Next()) {
    nsAutoPtr<Http2Stream> &stream = iter.Data();

    // On a clean server hangup the server sets the GoAwayID to be the ID of
    // the last transaction it processed. If the ID of stream in the
    // local stream is greater than that it can safely be restarted because the
    // server guarantees it was not partially processed. Streams that have not
    // registered an ID haven't actually been sent yet so they can always be
    // restarted.
    if (mCleanShutdown &&
        (stream->StreamID() > mGoAwayID || !stream->HasRegisteredID())) {
      CloseStream(stream, NS_ERROR_NET_RESET);  // can be restarted
    } else if (stream->RecvdData()) {
      CloseStream(stream, NS_ERROR_NET_PARTIAL_TRANSFER);
    } else if (mGoAwayReason == INADEQUATE_SECURITY) {
      CloseStream(stream, NS_ERROR_NET_INADEQUATE_SECURITY);
    } else {
      CloseStream(stream, NS_ERROR_ABORT);
    }
  }
}

Http2Session::~Http2Session()
{
  LOG3(("Http2Session::~Http2Session %p mDownstreamState=%X",
        this, mDownstreamState));

  Shutdown();

  Telemetry::Accumulate(Telemetry::SPDY_PARALLEL_STREAMS, mConcurrentHighWater);
  Telemetry::Accumulate(Telemetry::SPDY_REQUEST_PER_CONN, (mNextStreamID - 1) / 2);
  Telemetry::Accumulate(Telemetry::SPDY_SERVER_INITIATED_STREAMS,
                        mServerPushedResources);
  Telemetry::Accumulate(Telemetry::SPDY_GOAWAY_LOCAL, mClientGoAwayReason);
  Telemetry::Accumulate(Telemetry::SPDY_GOAWAY_PEER, mPeerGoAwayReason);
}

void
Http2Session::LogIO(Http2Session *self, Http2Stream *stream,
                    const char *label,
                    const char *data, uint32_t datalen)
{
  if (!LOG5_ENABLED())
    return;

  LOG5(("Http2Session::LogIO %p stream=%p id=0x%X [%s]",
        self, stream, stream ? stream->StreamID() : 0, label));

  // Max line is (16 * 3) + 10(prefix) + newline + null
  char linebuf[128];
  uint32_t index;
  char *line = linebuf;

  linebuf[127] = 0;

  for (index = 0; index < datalen; ++index) {
    if (!(index % 16)) {
      if (index) {
        *line = 0;
        LOG5(("%s", linebuf));
      }
      line = linebuf;
      snprintf(line, 128, "%08X: ", index);
      line += 10;
    }
    snprintf(line, 128 - (line - linebuf), "%02X ", (reinterpret_cast<const uint8_t *>(data))[index]);
    line += 3;
  }
  if (index) {
    *line = 0;
    LOG5(("%s", linebuf));
  }
}

typedef nsresult (*Http2ControlFx) (Http2Session *self);
static Http2ControlFx sControlFunctions[] = {
  nullptr, // type 0 data is not a control function
  Http2Session::RecvHeaders,
  Http2Session::RecvPriority,
  Http2Session::RecvRstStream,
  Http2Session::RecvSettings,
  Http2Session::RecvPushPromise,
  Http2Session::RecvPing,
  Http2Session::RecvGoAway,
  Http2Session::RecvWindowUpdate,
  Http2Session::RecvContinuation,
  Http2Session::RecvAltSvc // extension for type 0x0A
};

bool
Http2Session::RoomForMoreConcurrent()
{
  MOZ_ASSERT(PR_GetCurrentThread() == gSocketThread);
  return (mConcurrent < mMaxConcurrent);
}

bool
Http2Session::RoomForMoreStreams()
{
  if (mNextStreamID + mStreamTransactionHash.Count() * 2 > kMaxStreamID)
    return false;

  return !mShouldGoAway;
}

PRIntervalTime
Http2Session::IdleTime()
{
  return PR_IntervalNow() - mLastDataReadEpoch;
}

uint32_t
Http2Session::ReadTimeoutTick(PRIntervalTime now)
{
  MOZ_ASSERT(PR_GetCurrentThread() == gSocketThread);

  LOG3(("Http2Session::ReadTimeoutTick %p delta since last read %ds\n",
       this, PR_IntervalToSeconds(now - mLastReadEpoch)));

  if (!mPingThreshold)
    return UINT32_MAX;

  if ((now - mLastReadEpoch) < mPingThreshold) {
    // recent activity means ping is not an issue
    if (mPingSentEpoch) {
      mPingSentEpoch = 0;
      if (mPreviousUsed) {
        // restore the former value
        mPingThreshold = mPreviousPingThreshold;
        mPreviousUsed = false;
      }
    }

    return PR_IntervalToSeconds(mPingThreshold) -
      PR_IntervalToSeconds(now - mLastReadEpoch);
  }

  if (mPingSentEpoch) {
    LOG3(("Http2Session::ReadTimeoutTick %p handle outstanding ping\n"));
    if ((now - mPingSentEpoch) >= gHttpHandler->SpdyPingTimeout()) {
      LOG3(("Http2Session::ReadTimeoutTick %p Ping Timer Exhaustion\n", this));
      mPingSentEpoch = 0;
      Close(NS_ERROR_NET_TIMEOUT);
      return UINT32_MAX;
    }
    return 1; // run the tick aggressively while ping is outstanding
  }

  LOG3(("Http2Session::ReadTimeoutTick %p generating ping\n", this));

  mPingSentEpoch = PR_IntervalNow();
  if (!mPingSentEpoch) {
    mPingSentEpoch = 1; // avoid the 0 sentinel value
  }
  GeneratePing(false);
  ResumeRecv(); // read the ping reply

  // Check for orphaned push streams. This looks expensive, but generally the
  // list is empty.
  Http2PushedStream *deleteMe;
  TimeStamp timestampNow;
  do {
    deleteMe = nullptr;

    for (uint32_t index = mPushedStreams.Length();
         index > 0 ; --index) {
      Http2PushedStream *pushedStream = mPushedStreams[index - 1];

      if (timestampNow.IsNull())
        timestampNow = TimeStamp::Now(); // lazy initializer

      // if stream finished, but is not connected, and its been like that for
      // long then cleanup the stream.
      if (pushedStream->IsOrphaned(timestampNow))
      {
        LOG3(("Http2Session Timeout Pushed Stream %p 0x%X\n",
              this, pushedStream->StreamID()));
        deleteMe = pushedStream;
        break; // don't CleanupStream() while iterating this vector
      }
    }
    if (deleteMe)
      CleanupStream(deleteMe, NS_ERROR_ABORT, CANCEL_ERROR);

  } while (deleteMe);

  return 1; // run the tick aggressively while ping is outstanding
}

uint32_t
Http2Session::RegisterStreamID(Http2Stream *stream, uint32_t aNewID)
{
  MOZ_ASSERT(PR_GetCurrentThread() == gSocketThread);
  MOZ_ASSERT(mNextStreamID < 0xfffffff0,
             "should have stopped admitting streams");
  MOZ_ASSERT(!(aNewID & 1),
             "0 for autoassign pull, otherwise explicit even push assignment");

  if (!aNewID) {
    // auto generate a new pull stream ID
    aNewID = mNextStreamID;
    MOZ_ASSERT(aNewID & 1, "pull ID must be odd.");
    mNextStreamID += 2;
  }

  LOG3(("Http2Session::RegisterStreamID session=%p stream=%p id=0x%X "
        "concurrent=%d",this, stream, aNewID, mConcurrent));

  // We've used up plenty of ID's on this session. Start
  // moving to a new one before there is a crunch involving
  // server push streams or concurrent non-registered submits
  if (aNewID >= kMaxStreamID)
    mShouldGoAway = true;

  // integrity check
  if (mStreamIDHash.Get(aNewID)) {
    LOG3(("   New ID already present\n"));
    MOZ_ASSERT(false, "New ID already present in mStreamIDHash");
    mShouldGoAway = true;
    return kDeadStreamID;
  }

  mStreamIDHash.Put(aNewID, stream);
  return aNewID;
}

bool
Http2Session::AddStream(nsAHttpTransaction *aHttpTransaction,
                        int32_t aPriority,
                        bool aUseTunnel,
                        nsIInterfaceRequestor *aCallbacks)
{
  MOZ_ASSERT(PR_GetCurrentThread() == gSocketThread);

  // integrity check
  if (mStreamTransactionHash.Get(aHttpTransaction)) {
    LOG3(("   New transaction already present\n"));
    MOZ_ASSERT(false, "AddStream duplicate transaction pointer");
    return false;
  }

  if (!mConnection) {
    mConnection = aHttpTransaction->Connection();
  }

  if (mClosed || mShouldGoAway) {
    nsHttpTransaction *trans = aHttpTransaction->QueryHttpTransaction();
    if (trans && !trans->GetPushedStream()) {
      LOG3(("Http2Session::AddStream %p atrans=%p trans=%p session unusable - resched.\n",
            this, aHttpTransaction, trans));
      aHttpTransaction->SetConnection(nullptr);
      gHttpHandler->InitiateTransaction(trans, trans->Priority());
      return true;
    }
  }

  aHttpTransaction->SetConnection(this);

  if (aUseTunnel) {
    LOG3(("Http2Session::AddStream session=%p trans=%p OnTunnel",
          this, aHttpTransaction));
    DispatchOnTunnel(aHttpTransaction, aCallbacks);
    return true;
  }

  Http2Stream *stream = new Http2Stream(aHttpTransaction, this, aPriority);

  LOG3(("Http2Session::AddStream session=%p stream=%p serial=%u "
        "NextID=0x%X (tentative)", this, stream, mSerial, mNextStreamID));

  mStreamTransactionHash.Put(aHttpTransaction, stream);

  mReadyForWrite.Push(stream);
  SetWriteCallbacks();

  // Kick off the SYN transmit without waiting for the poll loop
  // This won't work for the first stream because there is no segment reader
  // yet.
  if (mSegmentReader) {
    uint32_t countRead;
    ReadSegments(nullptr, kDefaultBufferSize, &countRead);
  }

  if (!(aHttpTransaction->Caps() & NS_HTTP_ALLOW_KEEPALIVE) &&
      !aHttpTransaction->IsNullTransaction()) {
    LOG3(("Http2Session::AddStream %p transaction %p forces keep-alive off.\n",
          this, aHttpTransaction));
    DontReuse();
  }

  return true;
}

void
Http2Session::QueueStream(Http2Stream *stream)
{
  // will be removed via processpending or a shutdown path
  MOZ_ASSERT(PR_GetCurrentThread() == gSocketThread);
  MOZ_ASSERT(!stream->CountAsActive());
  MOZ_ASSERT(!stream->Queued());

  LOG3(("Http2Session::QueueStream %p stream %p queued.", this, stream));

#ifdef DEBUG
  int32_t qsize = mQueuedStreams.GetSize();
  for (int32_t i = 0; i < qsize; i++) {
    Http2Stream *qStream = static_cast<Http2Stream *>(mQueuedStreams.ObjectAt(i));
    MOZ_ASSERT(qStream != stream);
    MOZ_ASSERT(qStream->Queued());
  }
#endif

  stream->SetQueued(true);
  mQueuedStreams.Push(stream);
}

void
Http2Session::ProcessPending()
{
  MOZ_ASSERT(PR_GetCurrentThread() == gSocketThread);

  Http2Stream*stream;
  while (RoomForMoreConcurrent() &&
         (stream = static_cast<Http2Stream *>(mQueuedStreams.PopFront()))) {

    LOG3(("Http2Session::ProcessPending %p stream %p woken from queue.",
          this, stream));
    MOZ_ASSERT(!stream->CountAsActive());
    MOZ_ASSERT(stream->Queued());
    stream->SetQueued(false);
    mReadyForWrite.Push(stream);
    SetWriteCallbacks();
  }
}

nsresult
Http2Session::NetworkRead(nsAHttpSegmentWriter *writer, char *buf,
                          uint32_t count, uint32_t *countWritten)
{
  MOZ_ASSERT(PR_GetCurrentThread() == gSocketThread);

  if (!count) {
    *countWritten = 0;
    return NS_OK;
  }

  nsresult rv = writer->OnWriteSegment(buf, count, countWritten);
  if (NS_SUCCEEDED(rv) && *countWritten > 0)
    mLastReadEpoch = PR_IntervalNow();
  return rv;
}

void
Http2Session::SetWriteCallbacks()
{
  if (mConnection && (GetWriteQueueSize() || mOutputQueueUsed))
    mConnection->ResumeSend();
}

void
Http2Session::RealignOutputQueue()
{
  if (mAttemptingEarlyData) {
    // We can't realign right now, because we may need what's in there if early
    // data fails.
    return;
  }

  mOutputQueueUsed -= mOutputQueueSent;
  memmove(mOutputQueueBuffer.get(),
          mOutputQueueBuffer.get() + mOutputQueueSent,
          mOutputQueueUsed);
  mOutputQueueSent = 0;
}

void
Http2Session::FlushOutputQueue()
{
  if (!mSegmentReader || !mOutputQueueUsed)
    return;

  nsresult rv;
  uint32_t countRead;
  uint32_t avail = mOutputQueueUsed - mOutputQueueSent;

  if (!avail && mAttemptingEarlyData) {
    // This is kind of a hack, but there are cases where we'll have already
    // written the data we want whlie doing early data, but we get called again
    // with a reader, and we need to avoid calling the reader when there's
    // nothing for it to read.
    return;
  }

  rv = mSegmentReader->
    OnReadSegment(mOutputQueueBuffer.get() + mOutputQueueSent, avail,
                  &countRead);
  LOG3(("Http2Session::FlushOutputQueue %p sz=%d rv=%x actual=%d",
        this, avail, rv, countRead));

  // Dont worry about errors on write, we will pick this up as a read error too
  if (NS_FAILED(rv))
    return;

  mOutputQueueSent += countRead;

  if (mAttemptingEarlyData) {
    return;
  }

  if (countRead == avail) {
    mOutputQueueUsed = 0;
    mOutputQueueSent = 0;
    return;
  }

  // If the output queue is close to filling up and we have sent out a good
  // chunk of data from the beginning then realign it.

  if ((mOutputQueueSent >= kQueueMinimumCleanup) &&
      ((mOutputQueueSize - mOutputQueueUsed) < kQueueTailRoom)) {
    RealignOutputQueue();
  }
}

void
Http2Session::DontReuse()
{
  LOG3(("Http2Session::DontReuse %p\n", this));
  mShouldGoAway = true;
  if (!mStreamTransactionHash.Count())
    Close(NS_OK);
}

uint32_t
Http2Session::SpdyVersion()
{
  return HTTP_VERSION_2;
}

uint32_t
Http2Session::GetWriteQueueSize()
{
  MOZ_ASSERT(PR_GetCurrentThread() == gSocketThread);

  return mReadyForWrite.GetSize();
}

void
Http2Session::ChangeDownstreamState(enum internalStateType newState)
{
  MOZ_ASSERT(PR_GetCurrentThread() == gSocketThread);

  LOG3(("Http2Session::ChangeDownstreamState() %p from %X to %X",
        this, mDownstreamState, newState));
  mDownstreamState = newState;
}

void
Http2Session::ResetDownstreamState()
{
  MOZ_ASSERT(PR_GetCurrentThread() == gSocketThread);

  LOG3(("Http2Session::ResetDownstreamState() %p", this));
  ChangeDownstreamState(BUFFERING_FRAME_HEADER);

  if (mInputFrameFinal && mInputFrameDataStream) {
    mInputFrameFinal = false;
    LOG3(("  SetRecvdFin id=0x%x\n", mInputFrameDataStream->StreamID()));
    mInputFrameDataStream->SetRecvdFin(true);
    MaybeDecrementConcurrent(mInputFrameDataStream);
  }
  mInputFrameFinal = false;
  mInputFrameBufferUsed = 0;
  mInputFrameDataStream = nullptr;
}

// return true if activated (and counted against max)
// otherwise return false and queue
bool
Http2Session::TryToActivate(Http2Stream *aStream)
{
  if (aStream->Queued()) {
    LOG3(("Http2Session::TryToActivate %p stream=%p already queued.\n", this, aStream));
    return false;
  }

  if (!RoomForMoreConcurrent()) {
    LOG3(("Http2Session::TryToActivate %p stream=%p no room for more concurrent "
          "streams %d\n", this, aStream));
    QueueStream(aStream);
    return false;
  }

  LOG3(("Http2Session::TryToActivate %p stream=%p\n", this, aStream));
  IncrementConcurrent(aStream);
  return true;
}

void
Http2Session::IncrementConcurrent(Http2Stream *stream)
{
  MOZ_ASSERT(PR_GetCurrentThread() == gSocketThread);
  MOZ_ASSERT(!stream->StreamID() || (stream->StreamID() & 1),
             "Do not activate pushed streams");

  nsAHttpTransaction *trans = stream->Transaction();
  if (!trans || !trans->IsNullTransaction() || trans->QuerySpdyConnectTransaction()) {

    MOZ_ASSERT(!stream->CountAsActive());
    stream->SetCountAsActive(true);
    ++mConcurrent;

    if (mConcurrent > mConcurrentHighWater) {
      mConcurrentHighWater = mConcurrent;
    }
    LOG3(("Http2Session::IncrementCounter %p counting stream %p Currently %d "
          "streams in session, high water mark is %d\n",
          this, stream, mConcurrent, mConcurrentHighWater));
  }
}

// call with data length (i.e. 0 for 0 data bytes - ignore 9 byte header)
// dest must have 9 bytes of allocated space
template<typename charType> void
Http2Session::CreateFrameHeader(charType dest, uint16_t frameLength,
                                uint8_t frameType, uint8_t frameFlags,
                                uint32_t streamID)
{
  MOZ_ASSERT(frameLength <= kMaxFrameData, "framelength too large");
  MOZ_ASSERT(!(streamID & 0x80000000));
  MOZ_ASSERT(!frameFlags ||
             (frameType != FRAME_TYPE_PRIORITY &&
              frameType != FRAME_TYPE_RST_STREAM &&
              frameType != FRAME_TYPE_GOAWAY &&
              frameType != FRAME_TYPE_WINDOW_UPDATE));

  dest[0] = 0x00;
  NetworkEndian::writeUint16(dest + 1, frameLength);
  dest[3] = frameType;
  dest[4] = frameFlags;
  NetworkEndian::writeUint32(dest + 5, streamID);
}

char *
Http2Session::EnsureOutputBuffer(uint32_t spaceNeeded)
{
  // this is an infallible allocation (if an allocation is
  // needed, which is probably isn't)
  EnsureBuffer(mOutputQueueBuffer, mOutputQueueUsed + spaceNeeded,
               mOutputQueueUsed, mOutputQueueSize);
  return mOutputQueueBuffer.get() + mOutputQueueUsed;
}

template void
Http2Session::CreateFrameHeader(char *dest, uint16_t frameLength,
                                uint8_t frameType, uint8_t frameFlags,
                                uint32_t streamID);

template void
Http2Session::CreateFrameHeader(uint8_t *dest, uint16_t frameLength,
                                uint8_t frameType, uint8_t frameFlags,
                                uint32_t streamID);

void
Http2Session::MaybeDecrementConcurrent(Http2Stream *aStream)
{
  MOZ_ASSERT(PR_GetCurrentThread() == gSocketThread);
  LOG3(("MaybeDecrementConcurrent %p id=0x%X concurrent=%d active=%d\n",
        this, aStream->StreamID(), mConcurrent, aStream->CountAsActive()));

  if (!aStream->CountAsActive())
    return;

  MOZ_ASSERT(mConcurrent);
  aStream->SetCountAsActive(false);
  --mConcurrent;
  ProcessPending();
}

// Need to decompress some data in order to keep the compression
// context correct, but we really don't care what the result is
nsresult
Http2Session::UncompressAndDiscard(bool isPush)
{
  nsresult rv;
  nsAutoCString trash;

  rv = mDecompressor.DecodeHeaderBlock(reinterpret_cast<const uint8_t *>(mDecompressBuffer.BeginReading()),
                                       mDecompressBuffer.Length(), trash, isPush);
  mDecompressBuffer.Truncate();
  if (NS_FAILED(rv)) {
    LOG3(("Http2Session::UncompressAndDiscard %p Compression Error\n",
          this));
    mGoAwayReason = COMPRESSION_ERROR;
    return rv;
  }
  return NS_OK;
}

void
Http2Session::GeneratePing(bool isAck)
{
  MOZ_ASSERT(PR_GetCurrentThread() == gSocketThread);
  LOG3(("Http2Session::GeneratePing %p isAck=%d\n", this, isAck));

  char *packet = EnsureOutputBuffer(kFrameHeaderBytes + 8);
  mOutputQueueUsed += kFrameHeaderBytes + 8;

  if (isAck) {
    CreateFrameHeader(packet, 8, FRAME_TYPE_PING, kFlag_ACK, 0);
    memcpy(packet + kFrameHeaderBytes,
           mInputFrameBuffer.get() + kFrameHeaderBytes, 8);
  } else {
    CreateFrameHeader(packet, 8, FRAME_TYPE_PING, 0, 0);
    memset(packet + kFrameHeaderBytes, 0, 8);
  }

  LogIO(this, nullptr, "Generate Ping", packet, kFrameHeaderBytes + 8);
  FlushOutputQueue();
}

void
Http2Session::GenerateSettingsAck()
{
  // need to generate ack of this settings frame
  MOZ_ASSERT(PR_GetCurrentThread() == gSocketThread);
  LOG3(("Http2Session::GenerateSettingsAck %p\n", this));

  char *packet = EnsureOutputBuffer(kFrameHeaderBytes);
  mOutputQueueUsed += kFrameHeaderBytes;
  CreateFrameHeader(packet, 0, FRAME_TYPE_SETTINGS, kFlag_ACK, 0);
  LogIO(this, nullptr, "Generate Settings ACK", packet, kFrameHeaderBytes);
  FlushOutputQueue();
}

void
Http2Session::GeneratePriority(uint32_t aID, uint8_t aPriorityWeight)
{
  MOZ_ASSERT(PR_GetCurrentThread() == gSocketThread);
  LOG3(("Http2Session::GeneratePriority %p %X %X\n",
        this, aID, aPriorityWeight));

  uint32_t frameSize = kFrameHeaderBytes + 5;
  char *packet = EnsureOutputBuffer(frameSize);
  mOutputQueueUsed += frameSize;

  CreateFrameHeader(packet, 5, FRAME_TYPE_PRIORITY, 0, aID);
  NetworkEndian::writeUint32(packet + kFrameHeaderBytes, 0);
  memcpy(packet + frameSize - 1, &aPriorityWeight, 1);
  LogIO(this, nullptr, "Generate Priority", packet, frameSize);
  FlushOutputQueue();
}

void
Http2Session::GenerateRstStream(uint32_t aStatusCode, uint32_t aID)
{
  MOZ_ASSERT(PR_GetCurrentThread() == gSocketThread);

  // make sure we don't do this twice for the same stream (at least if we
  // have a stream entry for it)
  Http2Stream *stream = mStreamIDHash.Get(aID);
  if (stream) {
    if (stream->SentReset())
      return;
    stream->SetSentReset(true);
  }

  LOG3(("Http2Session::GenerateRst %p 0x%X %d\n", this, aID, aStatusCode));

  uint32_t frameSize = kFrameHeaderBytes + 4;
  char *packet = EnsureOutputBuffer(frameSize);
  mOutputQueueUsed += frameSize;
  CreateFrameHeader(packet, 4, FRAME_TYPE_RST_STREAM, 0, aID);

  NetworkEndian::writeUint32(packet + kFrameHeaderBytes, aStatusCode);

  LogIO(this, nullptr, "Generate Reset", packet, frameSize);
  FlushOutputQueue();
}

void
Http2Session::GenerateGoAway(uint32_t aStatusCode)
{
  MOZ_ASSERT(PR_GetCurrentThread() == gSocketThread);
  LOG3(("Http2Session::GenerateGoAway %p code=%X\n", this, aStatusCode));

  mClientGoAwayReason = aStatusCode;
  uint32_t frameSize = kFrameHeaderBytes + 8;
  char *packet = EnsureOutputBuffer(frameSize);
  mOutputQueueUsed += frameSize;

  CreateFrameHeader(packet, 8, FRAME_TYPE_GOAWAY, 0, 0);

  // last-good-stream-id are bytes 9-12 reflecting pushes
  NetworkEndian::writeUint32(packet + kFrameHeaderBytes, mOutgoingGoAwayID);

  // bytes 13-16 are the status code.
  NetworkEndian::writeUint32(packet + frameSize - 4, aStatusCode);

  LogIO(this, nullptr, "Generate GoAway", packet, frameSize);
  FlushOutputQueue();
}

// The Hello is comprised of
// 1] 24 octets of magic, which are designed to
// flush out silent but broken intermediaries
// 2] a settings frame which sets a small flow control window for pushes
// 3] a window update frame which creates a large session flow control window
// 4] 5 priority frames for streams which will never be opened with headers
//    these streams (3, 5, 7, 9, b) build a dependency tree that all other
//    streams will be direct leaves of.
void
Http2Session::SendHello()
{
  MOZ_ASSERT(PR_GetCurrentThread() == gSocketThread);
  LOG3(("Http2Session::SendHello %p\n", this));

  // sized for magic + 5 settings and a session window update and 5 priority frames
  // 24 magic, 33 for settings (9 header + 4 settings @6), 13 for window update,
  // 5 priority frames at 14 (9 + 5) each
  static const uint32_t maxSettings = 5;
  static const uint32_t prioritySize = 5 * (kFrameHeaderBytes + 5);
  static const uint32_t maxDataLen = 24 + kFrameHeaderBytes + maxSettings * 6 + 13 + prioritySize;
  char *packet = EnsureOutputBuffer(maxDataLen);
  memcpy(packet, kMagicHello, 24);
  mOutputQueueUsed += 24;
  LogIO(this, nullptr, "Magic Connection Header", packet, 24);

  packet = mOutputQueueBuffer.get() + mOutputQueueUsed;
  memset(packet, 0, maxDataLen - 24);

  // frame header will be filled in after we know how long the frame is
  uint8_t numberOfEntries = 0;

  // entries need to be listed in order by ID
  // 1st entry is bytes 9 to 14
  // 2nd entry is bytes 15 to 20
  // 3rd entry is bytes 21 to 26
  // 4th entry is bytes 27 to 32
  // 5th entry is bytes 33 to 38

  // Let the other endpoint know about our default HPACK decompress table size
  uint32_t maxHpackBufferSize = gHttpHandler->DefaultHpackBuffer();
  mDecompressor.SetInitialMaxBufferSize(maxHpackBufferSize);
  NetworkEndian::writeUint16(packet + kFrameHeaderBytes + (6 * numberOfEntries), SETTINGS_TYPE_HEADER_TABLE_SIZE);
  NetworkEndian::writeUint32(packet + kFrameHeaderBytes + (6 * numberOfEntries) + 2, maxHpackBufferSize);
  numberOfEntries++;

  if (!gHttpHandler->AllowPush()) {
    // If we don't support push then set MAX_CONCURRENT to 0 and also
    // set ENABLE_PUSH to 0
    NetworkEndian::writeUint16(packet + kFrameHeaderBytes + (6 * numberOfEntries), SETTINGS_TYPE_ENABLE_PUSH);
    // The value portion of the setting pair is already initialized to 0
    numberOfEntries++;

    NetworkEndian::writeUint16(packet + kFrameHeaderBytes + (6 * numberOfEntries), SETTINGS_TYPE_MAX_CONCURRENT);
    // The value portion of the setting pair is already initialized to 0
    numberOfEntries++;

    mWaitingForSettingsAck = true;
  }

  // Advertise the Push RWIN for the session, and on each new pull stream
  // send a window update
  NetworkEndian::writeUint16(packet + kFrameHeaderBytes + (6 * numberOfEntries), SETTINGS_TYPE_INITIAL_WINDOW);
  NetworkEndian::writeUint32(packet + kFrameHeaderBytes + (6 * numberOfEntries) + 2, mPushAllowance);
  numberOfEntries++;

  // Make sure the other endpoint knows that we're sticking to the default max
  // frame size
  NetworkEndian::writeUint16(packet + kFrameHeaderBytes + (6 * numberOfEntries), SETTINGS_TYPE_MAX_FRAME_SIZE);
  NetworkEndian::writeUint32(packet + kFrameHeaderBytes + (6 * numberOfEntries) + 2, kMaxFrameData);
  numberOfEntries++;

  MOZ_ASSERT(numberOfEntries <= maxSettings);
  uint32_t dataLen = 6 * numberOfEntries;
  CreateFrameHeader(packet, dataLen, FRAME_TYPE_SETTINGS, 0, 0);
  mOutputQueueUsed += kFrameHeaderBytes + dataLen;

  LogIO(this, nullptr, "Generate Settings", packet, kFrameHeaderBytes + dataLen);

  // now bump the local session window from 64KB
  uint32_t sessionWindowBump = mInitialRwin - kDefaultRwin;
  if (kDefaultRwin < mInitialRwin) {
    // send a window update for the session (Stream 0) for something large
    mLocalSessionWindow = mInitialRwin;

    packet = mOutputQueueBuffer.get() + mOutputQueueUsed;
    CreateFrameHeader(packet, 4, FRAME_TYPE_WINDOW_UPDATE, 0, 0);
    mOutputQueueUsed += kFrameHeaderBytes + 4;
    NetworkEndian::writeUint32(packet + kFrameHeaderBytes, sessionWindowBump);

    LOG3(("Session Window increase at start of session %p %u\n",
          this, sessionWindowBump));
    LogIO(this, nullptr, "Session Window Bump ", packet, kFrameHeaderBytes + 4);
  }

  if (gHttpHandler->UseH2Deps() && gHttpHandler->CriticalRequestPrioritization()) {
    mUseH2Deps = true;
    MOZ_ASSERT(mNextStreamID == kLeaderGroupID);
    CreatePriorityNode(kLeaderGroupID, 0, 200, "leader");
    mNextStreamID += 2;
    MOZ_ASSERT(mNextStreamID == kOtherGroupID);
    CreatePriorityNode(kOtherGroupID, 0, 100, "other");
    mNextStreamID += 2;
    MOZ_ASSERT(mNextStreamID == kBackgroundGroupID);
    CreatePriorityNode(kBackgroundGroupID, 0, 0, "background");
    mNextStreamID += 2;
    MOZ_ASSERT(mNextStreamID == kSpeculativeGroupID);
    CreatePriorityNode(kSpeculativeGroupID, kBackgroundGroupID, 0, "speculative");
    mNextStreamID += 2;
    MOZ_ASSERT(mNextStreamID == kFollowerGroupID);
    CreatePriorityNode(kFollowerGroupID, kLeaderGroupID, 0, "follower");
    mNextStreamID += 2;
  }

  FlushOutputQueue();
}

void
Http2Session::CreatePriorityNode(uint32_t streamID, uint32_t dependsOn, uint8_t weight,
                                 const char *label)
{
  char *packet = mOutputQueueBuffer.get() + mOutputQueueUsed;
  CreateFrameHeader(packet, 5, FRAME_TYPE_PRIORITY, 0, streamID);
  mOutputQueueUsed += kFrameHeaderBytes + 5;
  NetworkEndian::writeUint32(packet + kFrameHeaderBytes, dependsOn); // depends on
  packet[kFrameHeaderBytes + 4] = weight; // weight

  LOG3(("Http2Session %p generate Priority Frame 0x%X depends on 0x%X "
        "weight %d for %s class\n", this, streamID, dependsOn, weight, label));
  LogIO(this, nullptr, "Priority dep node", packet, kFrameHeaderBytes + 5);
}

// perform a bunch of integrity checks on the stream.
// returns true if passed, false (plus LOG and ABORT) if failed.
bool
Http2Session::VerifyStream(Http2Stream *aStream, uint32_t aOptionalID = 0)
{
  // This is annoying, but at least it is O(1)
  MOZ_ASSERT(PR_GetCurrentThread() == gSocketThread);

#ifndef DEBUG
  // Only do the real verification in debug builds
  return true;
#endif

  if (!aStream)
    return true;

  uint32_t test = 0;

  do {
    if (aStream->StreamID() == kDeadStreamID)
      break;

    nsAHttpTransaction *trans = aStream->Transaction();

    test++;
    if (!trans)
      break;

    test++;
    if (mStreamTransactionHash.Get(trans) != aStream)
      break;

    if (aStream->StreamID()) {
      Http2Stream *idStream = mStreamIDHash.Get(aStream->StreamID());

      test++;
      if (idStream != aStream)
        break;

      if (aOptionalID) {
        test++;
        if (idStream->StreamID() != aOptionalID)
          break;
      }
    }

    // tests passed
    return true;
  } while (0);

  LOG3(("Http2Session %p VerifyStream Failure %p stream->id=0x%X "
       "optionalID=0x%X trans=%p test=%d\n",
       this, aStream, aStream->StreamID(),
       aOptionalID, aStream->Transaction(), test));

  MOZ_ASSERT(false, "VerifyStream");
  return false;
}

void
Http2Session::CleanupStream(Http2Stream *aStream, nsresult aResult,
                            errorType aResetCode)
{
  MOZ_ASSERT(PR_GetCurrentThread() == gSocketThread);
  LOG3(("Http2Session::CleanupStream %p %p 0x%X %X\n",
        this, aStream, aStream ? aStream->StreamID() : 0, aResult));
  if (!aStream) {
    return;
  }

  if (aStream->DeferCleanup(aResult)) {
    LOG3(("Http2Session::CleanupStream 0x%X deferred\n", aStream->StreamID()));
    return;
  }

  if (!VerifyStream(aStream)) {
    LOG3(("Http2Session::CleanupStream failed to verify stream\n"));
    return;
  }

  Http2PushedStream *pushSource = aStream->PushSource();
  if (pushSource) {
    // aStream is a synthetic  attached to an even push
    MOZ_ASSERT(pushSource->GetConsumerStream() == aStream);
    MOZ_ASSERT(!aStream->StreamID());
    MOZ_ASSERT(!(pushSource->StreamID() & 0x1));
    pushSource->SetConsumerStream(nullptr);
  }

  // don't reset a stream that has recevied a fin or rst
  if (!aStream->RecvdFin() && !aStream->RecvdReset() && aStream->StreamID() &&
      !(mInputFrameFinal && (aStream == mInputFrameDataStream))) { // !(recvdfin with mark pending)
    LOG3(("Stream 0x%X had not processed recv FIN, sending RST code %X\n", aStream->StreamID(), aResetCode));
    GenerateRstStream(aResetCode, aStream->StreamID());
  }

  CloseStream(aStream, aResult);

  // Remove the stream from the ID hash table and, if an even id, the pushed
  // table too.
  uint32_t id = aStream->StreamID();
  if (id > 0) {
    mStreamIDHash.Remove(id);
    if (!(id & 1)) {
      mPushedStreams.RemoveElement(aStream);
      Http2PushedStream *pushStream = static_cast<Http2PushedStream *>(aStream);
      nsAutoCString hashKey;
      pushStream->GetHashKey(hashKey);
      nsIRequestContext *requestContext = aStream->RequestContext();
      if (requestContext) {
        SpdyPushCache *cache = nullptr;
        requestContext->GetSpdyPushCache(&cache);
        if (cache) {
          Http2PushedStream *trash = cache->RemovePushedStreamHttp2(hashKey);
          LOG3(("Http2Session::CleanupStream %p aStream=%p pushStream=%p trash=%p",
                this, aStream, pushStream, trash));
        }
      }
    }
  }

  RemoveStreamFromQueues(aStream);

  // removing from the stream transaction hash will
  // delete the Http2Stream and drop the reference to
  // its transaction
  mStreamTransactionHash.Remove(aStream->Transaction());

  if (mShouldGoAway && !mStreamTransactionHash.Count())
    Close(NS_OK);

  if (pushSource) {
    pushSource->SetDeferCleanupOnSuccess(false);
    CleanupStream(pushSource, aResult, aResetCode);
  }
}

void
Http2Session::CleanupStream(uint32_t aID, nsresult aResult, errorType aResetCode)
{
  MOZ_ASSERT(PR_GetCurrentThread() == gSocketThread);
  Http2Stream *stream = mStreamIDHash.Get(aID);
  LOG3(("Http2Session::CleanupStream %p by ID 0x%X to stream %p\n",
        this, aID, stream));
  if (!stream) {
    return;
  }
  CleanupStream(stream, aResult, aResetCode);
}

static void RemoveStreamFromQueue(Http2Stream *aStream, nsDeque &queue)
{
  size_t size = queue.GetSize();
  for (size_t count = 0; count < size; ++count) {
    Http2Stream *stream = static_cast<Http2Stream *>(queue.PopFront());
    if (stream != aStream)
      queue.Push(stream);
  }
}

void
Http2Session::RemoveStreamFromQueues(Http2Stream *aStream)
{
  RemoveStreamFromQueue(aStream, mReadyForWrite);
  RemoveStreamFromQueue(aStream, mQueuedStreams);
  RemoveStreamFromQueue(aStream, mPushesReadyForRead);
  RemoveStreamFromQueue(aStream, mSlowConsumersReadyForRead);
}

void
Http2Session::CloseStream(Http2Stream *aStream, nsresult aResult)
{
  MOZ_ASSERT(PR_GetCurrentThread() == gSocketThread);
  LOG3(("Http2Session::CloseStream %p %p 0x%x %X\n",
        this, aStream, aStream->StreamID(), aResult));

  MaybeDecrementConcurrent(aStream);

  // Check if partial frame reader
  if (aStream == mInputFrameDataStream) {
    LOG3(("Stream had active partial read frame on close"));
    ChangeDownstreamState(DISCARDING_DATA_FRAME);
    mInputFrameDataStream = nullptr;
  }

  RemoveStreamFromQueues(aStream);

  if (aStream->IsTunnel()) {
    UnRegisterTunnel(aStream);
  }

  // Send the stream the close() indication
  aStream->Close(aResult);
}

nsresult
Http2Session::SetInputFrameDataStream(uint32_t streamID)
{
  mInputFrameDataStream = mStreamIDHash.Get(streamID);
  if (VerifyStream(mInputFrameDataStream, streamID))
    return NS_OK;

  LOG3(("Http2Session::SetInputFrameDataStream failed to verify 0x%X\n",
       streamID));
  mInputFrameDataStream = nullptr;
  return NS_ERROR_UNEXPECTED;
}

nsresult
Http2Session::ParsePadding(uint8_t &paddingControlBytes, uint16_t &paddingLength)
{
  if (mInputFrameFlags & kFlag_PADDED) {
    paddingLength = *reinterpret_cast<uint8_t *>(&mInputFrameBuffer[kFrameHeaderBytes]);
    paddingControlBytes = 1;
  } else {
    paddingLength = 0;
    paddingControlBytes = 0;
  }

  if (static_cast<uint32_t>(paddingLength + paddingControlBytes) > mInputFrameDataSize) {
    // This is fatal to the session
    LOG3(("Http2Session::ParsePadding %p stream 0x%x PROTOCOL_ERROR "
          "paddingLength %d > frame size %d\n",
          this, mInputFrameID, paddingLength, mInputFrameDataSize));
    RETURN_SESSION_ERROR(this, PROTOCOL_ERROR);
  }

  return NS_OK;
}

nsresult
Http2Session::RecvHeaders(Http2Session *self)
{
  MOZ_ASSERT(self->mInputFrameType == FRAME_TYPE_HEADERS ||
             self->mInputFrameType == FRAME_TYPE_CONTINUATION);

  bool isContinuation = self->mExpectedHeaderID != 0;

  // If this doesn't have END_HEADERS set on it then require the next
  // frame to be HEADERS of the same ID
  bool endHeadersFlag = self->mInputFrameFlags & kFlag_END_HEADERS;

  if (endHeadersFlag)
    self->mExpectedHeaderID = 0;
  else
    self->mExpectedHeaderID = self->mInputFrameID;

  uint32_t priorityLen = 0;
  if (self->mInputFrameFlags & kFlag_PRIORITY) {
    priorityLen = 5;
  }
  self->SetInputFrameDataStream(self->mInputFrameID);

  // Find out how much padding this frame has, so we can only extract the real
  // header data from the frame.
  uint16_t paddingLength = 0;
  uint8_t paddingControlBytes = 0;
  nsresult rv;

  if (!isContinuation) {
    self->mDecompressBuffer.Truncate();
    rv = self->ParsePadding(paddingControlBytes, paddingLength);
    if (NS_FAILED(rv)) {
      return rv;
    }
  }

  LOG3(("Http2Session::RecvHeaders %p stream 0x%X priorityLen=%d stream=%p "
        "end_stream=%d end_headers=%d priority_group=%d "
        "paddingLength=%d padded=%d\n",
        self, self->mInputFrameID, priorityLen, self->mInputFrameDataStream,
        self->mInputFrameFlags & kFlag_END_STREAM,
        self->mInputFrameFlags & kFlag_END_HEADERS,
        self->mInputFrameFlags & kFlag_PRIORITY,
        paddingLength,
        self->mInputFrameFlags & kFlag_PADDED));

  if ((paddingControlBytes + priorityLen + paddingLength) > self->mInputFrameDataSize) {
    // This is fatal to the session
    RETURN_SESSION_ERROR(self, PROTOCOL_ERROR);
  }

  if (!self->mInputFrameDataStream) {
    // Cannot find stream. We can continue the session, but we need to
    // uncompress the header block to maintain the correct compression context

    LOG3(("Http2Session::RecvHeaders %p lookup mInputFrameID stream "
          "0x%X failed. NextStreamID = 0x%X\n",
          self, self->mInputFrameID, self->mNextStreamID));

    if (self->mInputFrameID >= self->mNextStreamID)
      self->GenerateRstStream(PROTOCOL_ERROR, self->mInputFrameID);

    self->mDecompressBuffer.Append(&self->mInputFrameBuffer[kFrameHeaderBytes + paddingControlBytes + priorityLen],
                                   self->mInputFrameDataSize - paddingControlBytes - priorityLen - paddingLength);

    if (self->mInputFrameFlags & kFlag_END_HEADERS) {
      rv = self->UncompressAndDiscard(false);
      if (NS_FAILED(rv)) {
        LOG3(("Http2Session::RecvHeaders uncompress failed\n"));
        // this is fatal to the session
        self->mGoAwayReason = COMPRESSION_ERROR;
        return rv;
      }
    }

    self->ResetDownstreamState();
    return NS_OK;
  }

  // make sure this is either the first headers or a trailer
  if (self->mInputFrameDataStream->AllHeadersReceived() &&
      !(self->mInputFrameFlags & kFlag_END_STREAM)) {
    // Any header block after the first that does *not* end the stream is
    // illegal.
    LOG3(("Http2Session::Illegal Extra HeaderBlock %p 0x%X\n", self, self->mInputFrameID));
    RETURN_SESSION_ERROR(self, PROTOCOL_ERROR);
  }

  // queue up any compression bytes
  self->mDecompressBuffer.Append(&self->mInputFrameBuffer[kFrameHeaderBytes + paddingControlBytes + priorityLen],
                                 self->mInputFrameDataSize - paddingControlBytes - priorityLen - paddingLength);

  self->mInputFrameDataStream->UpdateTransportReadEvents(self->mInputFrameDataSize);
  self->mLastDataReadEpoch = self->mLastReadEpoch;

  if (!endHeadersFlag) { // more are coming - don't process yet
    self->ResetDownstreamState();
    return NS_OK;
  }

  rv = self->ResponseHeadersComplete();
  if (rv == NS_ERROR_ILLEGAL_VALUE) {
    LOG3(("Http2Session::RecvHeaders %p PROTOCOL_ERROR detected stream 0x%X\n",
          self, self->mInputFrameID));
    self->CleanupStream(self->mInputFrameDataStream, rv, PROTOCOL_ERROR);
    self->ResetDownstreamState();
    rv = NS_OK;
  } else if (NS_FAILED(rv)) {
    // This is fatal to the session.
    self->mGoAwayReason = COMPRESSION_ERROR;
  }
  return rv;
}

// ResponseHeadersComplete() returns NS_ERROR_ILLEGAL_VALUE when the stream
// should be reset with a PROTOCOL_ERROR, NS_OK when the response headers were
// fine, and any other error is fatal to the session.
nsresult
Http2Session::ResponseHeadersComplete()
{
  LOG3(("Http2Session::ResponseHeadersComplete %p for 0x%X fin=%d",
        this, mInputFrameDataStream->StreamID(), mInputFrameFinal));

  // only interpret headers once, afterwards ignore as trailers
  if (mInputFrameDataStream->AllHeadersReceived()) {
    LOG3(("Http2Session::ResponseHeadersComplete extra headers"));
    MOZ_ASSERT(mInputFrameFlags & kFlag_END_STREAM);
    nsresult rv = UncompressAndDiscard(false);
    if (NS_FAILED(rv)) {
      LOG3(("Http2Session::ResponseHeadersComplete extra uncompress failed\n"));
      return rv;
    }
    mFlatHTTPResponseHeadersOut = 0;
    mFlatHTTPResponseHeaders.Truncate();
    if (mInputFrameFinal) {
      // need to process the fin
      ChangeDownstreamState(PROCESSING_COMPLETE_HEADERS);
    } else {
      ResetDownstreamState();
    }

    return NS_OK;
  }

  // if this turns out to be a 1xx response code we have to
  // undo the headers received bit that we are setting here.
  bool didFirstSetAllRecvd = !mInputFrameDataStream->AllHeadersReceived();
  mInputFrameDataStream->SetAllHeadersReceived();

  // The stream needs to see flattened http headers
  // Uncompressed http/2 format headers currently live in
  // Http2Stream::mDecompressBuffer - convert that to HTTP format in
  // mFlatHTTPResponseHeaders via ConvertHeaders()

  nsresult rv;
  int32_t httpResponseCode; // out param to ConvertResponseHeaders
  mFlatHTTPResponseHeadersOut = 0;
  rv = mInputFrameDataStream->ConvertResponseHeaders(&mDecompressor,
                                                     mDecompressBuffer,
                                                     mFlatHTTPResponseHeaders,
                                                     httpResponseCode);
  if (rv == NS_ERROR_NET_RESET) {
    LOG(("Http2Session::ResponseHeadersComplete %p ConvertResponseHeaders reset\n", this));
    // This means the stream found connection-oriented auth. Treat this like we
    // got a reset with HTTP_1_1_REQUIRED.
    mInputFrameDataStream->Transaction()->DisableSpdy();
    CleanupStream(mInputFrameDataStream, NS_ERROR_NET_RESET, CANCEL_ERROR);
    ResetDownstreamState();
    return NS_OK;
  } else if (NS_FAILED(rv)) {
    return rv;
  }

  // allow more headers in the case of 1xx
  if (((httpResponseCode / 100) == 1) && didFirstSetAllRecvd) {
    mInputFrameDataStream->UnsetAllHeadersReceived();
  }

  ChangeDownstreamState(PROCESSING_COMPLETE_HEADERS);
  return NS_OK;
}

nsresult
Http2Session::RecvPriority(Http2Session *self)
{
  MOZ_ASSERT(self->mInputFrameType == FRAME_TYPE_PRIORITY);

  if (self->mInputFrameDataSize != 5) {
    LOG3(("Http2Session::RecvPriority %p wrong length data=%d\n",
          self, self->mInputFrameDataSize));
    RETURN_SESSION_ERROR(self, PROTOCOL_ERROR);
  }

  if (!self->mInputFrameID) {
    LOG3(("Http2Session::RecvPriority %p stream ID of 0.\n", self));
    RETURN_SESSION_ERROR(self, PROTOCOL_ERROR);
  }

  nsresult rv = self->SetInputFrameDataStream(self->mInputFrameID);
  if (NS_FAILED(rv))
    return rv;

  uint32_t newPriorityDependency = NetworkEndian::readUint32(
      self->mInputFrameBuffer.get() + kFrameHeaderBytes);
  bool exclusive = !!(newPriorityDependency & 0x80000000);
  newPriorityDependency &= 0x7fffffff;
  uint8_t newPriorityWeight = *(self->mInputFrameBuffer.get() + kFrameHeaderBytes + 4);
  if (self->mInputFrameDataStream) {
    self->mInputFrameDataStream->SetPriorityDependency(newPriorityDependency,
                                                       newPriorityWeight,
                                                       exclusive);
  }

  self->ResetDownstreamState();
  return NS_OK;
}

nsresult
Http2Session::RecvRstStream(Http2Session *self)
{
  MOZ_ASSERT(self->mInputFrameType == FRAME_TYPE_RST_STREAM);

  if (self->mInputFrameDataSize != 4) {
    LOG3(("Http2Session::RecvRstStream %p RST_STREAM wrong length data=%d",
          self, self->mInputFrameDataSize));
    RETURN_SESSION_ERROR(self, PROTOCOL_ERROR);
  }

  if (!self->mInputFrameID) {
    LOG3(("Http2Session::RecvRstStream %p stream ID of 0.\n", self));
    RETURN_SESSION_ERROR(self, PROTOCOL_ERROR);
  }

  self->mDownstreamRstReason = NetworkEndian::readUint32(
      self->mInputFrameBuffer.get() + kFrameHeaderBytes);

  LOG3(("Http2Session::RecvRstStream %p RST_STREAM Reason Code %u ID %x\n",
        self, self->mDownstreamRstReason, self->mInputFrameID));

  self->SetInputFrameDataStream(self->mInputFrameID);
  if (!self->mInputFrameDataStream) {
    // if we can't find the stream just ignore it (4.2 closed)
    self->ResetDownstreamState();
    return NS_OK;
  }

  self->mInputFrameDataStream->SetRecvdReset(true);
  self->MaybeDecrementConcurrent(self->mInputFrameDataStream);
  self->ChangeDownstreamState(PROCESSING_CONTROL_RST_STREAM);
  return NS_OK;
}

nsresult
Http2Session::RecvSettings(Http2Session *self)
{
  MOZ_ASSERT(self->mInputFrameType == FRAME_TYPE_SETTINGS);

  if (self->mInputFrameID) {
    LOG3(("Http2Session::RecvSettings %p needs stream ID of 0. 0x%X\n",
          self, self->mInputFrameID));
    RETURN_SESSION_ERROR(self, PROTOCOL_ERROR);
  }

  if (self->mInputFrameDataSize % 6) {
    // Number of Settings is determined by dividing by each 6 byte setting
    // entry. So the payload must be a multiple of 6.
    LOG3(("Http2Session::RecvSettings %p SETTINGS wrong length data=%d",
          self, self->mInputFrameDataSize));
    RETURN_SESSION_ERROR(self, PROTOCOL_ERROR);
  }

  uint32_t numEntries = self->mInputFrameDataSize / 6;
  LOG3(("Http2Session::RecvSettings %p SETTINGS Control Frame "
        "with %d entries ack=%X", self, numEntries,
        self->mInputFrameFlags & kFlag_ACK));

  if ((self->mInputFrameFlags & kFlag_ACK) && self->mInputFrameDataSize) {
    LOG3(("Http2Session::RecvSettings %p ACK with non zero payload is err\n"));
    RETURN_SESSION_ERROR(self, PROTOCOL_ERROR);
  }

  for (uint32_t index = 0; index < numEntries; ++index) {
    uint8_t *setting = reinterpret_cast<uint8_t *>
      (self->mInputFrameBuffer.get()) + kFrameHeaderBytes + index * 6;

    uint16_t id = NetworkEndian::readUint16(setting);
    uint32_t value = NetworkEndian::readUint32(setting + 2);
    LOG3(("Settings ID %u, Value %u", id, value));

    switch (id)
    {
    case SETTINGS_TYPE_HEADER_TABLE_SIZE:
      LOG3(("Compression header table setting received: %d\n", value));
      self->mCompressor.SetMaxBufferSize(value);
      break;

    case SETTINGS_TYPE_ENABLE_PUSH:
      LOG3(("Client received an ENABLE Push SETTING. Odd.\n"));
      // nop
      break;

    case SETTINGS_TYPE_MAX_CONCURRENT:
      self->mMaxConcurrent = value;
      Telemetry::Accumulate(Telemetry::SPDY_SETTINGS_MAX_STREAMS, value);
      self->ProcessPending();
      break;

    case SETTINGS_TYPE_INITIAL_WINDOW:
      {
        Telemetry::Accumulate(Telemetry::SPDY_SETTINGS_IW, value >> 10);
        int32_t delta = value - self->mServerInitialStreamWindow;
        self->mServerInitialStreamWindow = value;

        // SETTINGS only adjusts stream windows. Leave the session window alone.
        // We need to add the delta to all open streams (delta can be negative)
        for (auto iter = self->mStreamTransactionHash.Iter();
             !iter.Done();
             iter.Next()) {
          iter.Data()->UpdateServerReceiveWindow(delta);
        }
      }
      break;

    case SETTINGS_TYPE_MAX_FRAME_SIZE:
      {
        if ((value < kMaxFrameData) || (value >= 0x01000000)) {
          LOG3(("Received invalid max frame size 0x%X", value));
          RETURN_SESSION_ERROR(self, PROTOCOL_ERROR);
        }
        // We stick to the default for simplicity's sake, so nothing to change
      }
      break;

    default:
      break;
    }
  }

  self->ResetDownstreamState();

  if (!(self->mInputFrameFlags & kFlag_ACK)) {
    self->GenerateSettingsAck();
  } else if (self->mWaitingForSettingsAck) {
    self->mGoAwayOnPush = true;
  }

  return NS_OK;
}

nsresult
Http2Session::RecvPushPromise(Http2Session *self)
{
  MOZ_ASSERT(self->mInputFrameType == FRAME_TYPE_PUSH_PROMISE ||
             self->mInputFrameType == FRAME_TYPE_CONTINUATION);

  // Find out how much padding this frame has, so we can only extract the real
  // header data from the frame.
  uint16_t paddingLength = 0;
  uint8_t paddingControlBytes = 0;

  // If this doesn't have END_PUSH_PROMISE set on it then require the next
  // frame to be PUSH_PROMISE of the same ID
  uint32_t promiseLen;
  uint32_t promisedID;

  if (self->mExpectedPushPromiseID) {
    promiseLen = 0; // really a continuation frame
    promisedID = self->mContinuedPromiseStream;
  } else {
    self->mDecompressBuffer.Truncate();
    nsresult rv = self->ParsePadding(paddingControlBytes, paddingLength);
    if (NS_FAILED(rv)) {
      return rv;
    }
    promiseLen = 4;
    promisedID = NetworkEndian::readUint32(
        self->mInputFrameBuffer.get() + kFrameHeaderBytes + paddingControlBytes);
    promisedID &= 0x7fffffff;
    if (promisedID <= self->mLastPushedID) {
      LOG3(("Http2Session::RecvPushPromise %p ID too low %u expected > %u.\n",
            self, promisedID, self->mLastPushedID));
      RETURN_SESSION_ERROR(self, PROTOCOL_ERROR);
    }
    self->mLastPushedID = promisedID;
  }

  uint32_t associatedID = self->mInputFrameID;

  if (self->mInputFrameFlags & kFlag_END_PUSH_PROMISE) {
    self->mExpectedPushPromiseID = 0;
    self->mContinuedPromiseStream = 0;
  } else {
    self->mExpectedPushPromiseID = self->mInputFrameID;
    self->mContinuedPromiseStream = promisedID;
  }

  if ((paddingControlBytes + promiseLen + paddingLength) > self->mInputFrameDataSize) {
    // This is fatal to the session
    LOG3(("Http2Session::RecvPushPromise %p ID 0x%X assoc ID 0x%X "
          "PROTOCOL_ERROR extra %d > frame size %d\n",
          self, promisedID, associatedID, (paddingControlBytes + promiseLen + paddingLength),
          self->mInputFrameDataSize));
    RETURN_SESSION_ERROR(self, PROTOCOL_ERROR);
  }

  LOG3(("Http2Session::RecvPushPromise %p ID 0x%X assoc ID 0x%X "
        "paddingLength %d padded %d\n",
        self, promisedID, associatedID, paddingLength,
        self->mInputFrameFlags & kFlag_PADDED));

  if (!associatedID || !promisedID || (promisedID & 1)) {
    LOG3(("Http2Session::RecvPushPromise %p ID invalid.\n", self));
    RETURN_SESSION_ERROR(self, PROTOCOL_ERROR);
  }

  // confirm associated-to
  nsresult rv = self->SetInputFrameDataStream(associatedID);
  if (NS_FAILED(rv))
    return rv;

  Http2Stream *associatedStream = self->mInputFrameDataStream;
  ++(self->mServerPushedResources);

  // Anytime we start using the high bit of stream ID (either client or server)
  // begin to migrate to a new session.
  if (promisedID >= kMaxStreamID)
    self->mShouldGoAway = true;

  bool resetStream = true;
  SpdyPushCache *cache = nullptr;

  if (self->mShouldGoAway && !Http2PushedStream::TestOnPush(associatedStream)) {
    LOG3(("Http2Session::RecvPushPromise %p cache push while in GoAway "
          "mode refused.\n", self));
    self->GenerateRstStream(REFUSED_STREAM_ERROR, promisedID);
  } else if (!gHttpHandler->AllowPush()) {
    // ENABLE_PUSH and MAX_CONCURRENT_STREAMS of 0 in settings disabled push
    LOG3(("Http2Session::RecvPushPromise Push Recevied when Disabled\n"));
    if (self->mGoAwayOnPush) {
      LOG3(("Http2Session::RecvPushPromise sending GOAWAY"));
      RETURN_SESSION_ERROR(self, PROTOCOL_ERROR);
    }
    self->GenerateRstStream(REFUSED_STREAM_ERROR, promisedID);
  } else if (!(associatedID & 1)) {
    LOG3(("Http2Session::RecvPushPromise %p assocated=0x%X on pushed (even) stream not allowed\n",
          self, associatedID));
    self->GenerateRstStream(PROTOCOL_ERROR, promisedID);
  } else if (!associatedStream) {
    LOG3(("Http2Session::RecvPushPromise %p lookup associated ID failed.\n", self));
    self->GenerateRstStream(PROTOCOL_ERROR, promisedID);
  } else {
    nsIRequestContext *requestContext = associatedStream->RequestContext();
    if (requestContext) {
      requestContext->GetSpdyPushCache(&cache);
      if (!cache) {
        cache = new SpdyPushCache();
        if (!cache || NS_FAILED(requestContext->SetSpdyPushCache(cache))) {
          delete cache;
          cache = nullptr;
        }
      }
    }
    if (!cache) {
      // this is unexpected, but we can handle it just by refusing the push
      LOG3(("Http2Session::RecvPushPromise Push Recevied without push cache\n"));
      self->GenerateRstStream(REFUSED_STREAM_ERROR, promisedID);
    } else {
      resetStream = false;
    }
  }

  if (resetStream) {
    // Need to decompress the headers even though we aren't using them yet in
    // order to keep the compression context consistent for other frames
    self->mDecompressBuffer.Append(&self->mInputFrameBuffer[kFrameHeaderBytes + paddingControlBytes + promiseLen],
                                   self->mInputFrameDataSize - paddingControlBytes - promiseLen - paddingLength);
    if (self->mInputFrameFlags & kFlag_END_PUSH_PROMISE) {
      rv = self->UncompressAndDiscard(true);
      if (NS_FAILED(rv)) {
        LOG3(("Http2Session::RecvPushPromise uncompress failed\n"));
        self->mGoAwayReason = COMPRESSION_ERROR;
        return rv;
      }
    }
    self->ResetDownstreamState();
    return NS_OK;
  }

  self->mDecompressBuffer.Append(&self->mInputFrameBuffer[kFrameHeaderBytes + paddingControlBytes + promiseLen],
                                 self->mInputFrameDataSize - paddingControlBytes - promiseLen - paddingLength);

  if (!(self->mInputFrameFlags & kFlag_END_PUSH_PROMISE)) {
    LOG3(("Http2Session::RecvPushPromise not finishing processing for multi-frame push\n"));
    self->ResetDownstreamState();
    return NS_OK;
  }

  // Create the buffering transaction and push stream
  RefPtr<Http2PushTransactionBuffer> transactionBuffer =
    new Http2PushTransactionBuffer();
  transactionBuffer->SetConnection(self);
  Http2PushedStream *pushedStream =
    new Http2PushedStream(transactionBuffer, self, associatedStream, promisedID);

  rv = pushedStream->ConvertPushHeaders(&self->mDecompressor,
                                        self->mDecompressBuffer,
                                        pushedStream->GetRequestString());

  if (rv == NS_ERROR_NOT_IMPLEMENTED) {
    LOG3(("Http2Session::PushPromise Semantics not Implemented\n"));
    self->GenerateRstStream(REFUSED_STREAM_ERROR, promisedID);
    delete pushedStream;
    self->ResetDownstreamState();
    return NS_OK;
  }

  if (rv == NS_ERROR_ILLEGAL_VALUE) {
    // This means the decompression completed ok, but there was a problem with
    // the decoded headers. Reset the stream and go away.
    self->GenerateRstStream(PROTOCOL_ERROR, promisedID);
    delete pushedStream;
    self->ResetDownstreamState();
    return NS_OK;
  } else if (NS_FAILED(rv)) {
    // This is fatal to the session.
    self->mGoAwayReason = COMPRESSION_ERROR;
    return rv;
  }

  // Ownership of the pushed stream is by the transaction hash, just as it
  // is for a client initiated stream. Errors that aren't fatal to the
  // whole session must call cleanupStream() after this point in order
  // to remove the stream from that hash.
  self->mStreamTransactionHash.Put(transactionBuffer, pushedStream);
  self->mPushedStreams.AppendElement(pushedStream);

  if (self->RegisterStreamID(pushedStream, promisedID) == kDeadStreamID) {
    LOG3(("Http2Session::RecvPushPromise registerstreamid failed\n"));
    self->mGoAwayReason = INTERNAL_ERROR;
    return NS_ERROR_FAILURE;
  }

  if (promisedID > self->mOutgoingGoAwayID)
    self->mOutgoingGoAwayID = promisedID;

  // Fake the request side of the pushed HTTP transaction. Sets up hash
  // key and origin
  uint32_t notUsed;
  pushedStream->ReadSegments(nullptr, 1, &notUsed);

  nsAutoCString key;
  if (!pushedStream->GetHashKey(key)) {
    LOG3(("Http2Session::RecvPushPromise one of :authority :scheme :path missing from push\n"));
    self->CleanupStream(pushedStream, NS_ERROR_FAILURE, PROTOCOL_ERROR);
    self->ResetDownstreamState();
    return NS_OK;
  }

  RefPtr<nsStandardURL> associatedURL, pushedURL;
  rv = Http2Stream::MakeOriginURL(associatedStream->Origin(), associatedURL);
  if (NS_SUCCEEDED(rv)) {
    rv = Http2Stream::MakeOriginURL(pushedStream->Origin(), pushedURL);
  }
  LOG3(("Http2Session::RecvPushPromise %p checking %s == %s", self,
        associatedStream->Origin().get(), pushedStream->Origin().get()));
  bool match = false;
  if (NS_SUCCEEDED(rv)) {
    rv = associatedURL->Equals(pushedURL, &match);
  }
  if (NS_FAILED(rv)) {
    // Fallback to string equality of origins. This won't be guaranteed to be as
    // liberal as we want it to be, but it will at least be safe
    match = associatedStream->Origin().Equals(pushedStream->Origin());
  }
  if (!match) {
    LOG3(("Http2Session::RecvPushPromise %p pushed stream mismatched origin "
          "associated origin %s .. pushed origin %s\n", self,
          associatedStream->Origin().get(), pushedStream->Origin().get()));
    self->CleanupStream(pushedStream, NS_ERROR_FAILURE, REFUSED_STREAM_ERROR);
    self->ResetDownstreamState();
    return NS_OK;
  }

  if (pushedStream->TryOnPush()) {
    LOG3(("Http2Session::RecvPushPromise %p channel implements nsIHttpPushListener "
          "stream %p will not be placed into session cache.\n", self, pushedStream));
  } else {
    LOG3(("Http2Session::RecvPushPromise %p place stream into session cache\n", self));
    if (!cache->RegisterPushedStreamHttp2(key, pushedStream)) {
      LOG3(("Http2Session::RecvPushPromise registerPushedStream Failed\n"));
      self->CleanupStream(pushedStream, NS_ERROR_FAILURE, INTERNAL_ERROR);
      self->ResetDownstreamState();
      return NS_OK;
    }
  }

  pushedStream->SetHTTPState(Http2Stream::RESERVED_BY_REMOTE);
  static_assert(Http2Stream::kWorstPriority >= 0,
                "kWorstPriority out of range");
  uint8_t priorityWeight = (nsISupportsPriority::PRIORITY_LOWEST + 1) -
    (Http2Stream::kWorstPriority - Http2Stream::kNormalPriority);
  pushedStream->SetPriority(Http2Stream::kWorstPriority);
  self->GeneratePriority(promisedID, priorityWeight);
  self->ResetDownstreamState();
  return NS_OK;
}

nsresult
Http2Session::RecvPing(Http2Session *self)
{
  MOZ_ASSERT(self->mInputFrameType == FRAME_TYPE_PING);

  LOG3(("Http2Session::RecvPing %p PING Flags 0x%X.", self,
        self->mInputFrameFlags));

  if (self->mInputFrameDataSize != 8) {
    LOG3(("Http2Session::RecvPing %p PING had wrong amount of data %d",
          self, self->mInputFrameDataSize));
    RETURN_SESSION_ERROR(self, FRAME_SIZE_ERROR);
  }

  if (self->mInputFrameID) {
    LOG3(("Http2Session::RecvPing %p PING needs stream ID of 0. 0x%X\n",
          self, self->mInputFrameID));
    RETURN_SESSION_ERROR(self, PROTOCOL_ERROR);
  }

  if (self->mInputFrameFlags & kFlag_ACK) {
    // presumably a reply to our timeout ping.. don't reply to it
    self->mPingSentEpoch = 0;
  } else {
    // reply with a ack'd ping
    self->GeneratePing(true);
  }

  self->ResetDownstreamState();
  return NS_OK;
}

nsresult
Http2Session::RecvGoAway(Http2Session *self)
{
  MOZ_ASSERT(self->mInputFrameType == FRAME_TYPE_GOAWAY);

  if (self->mInputFrameDataSize < 8) {
    // data > 8 is an opaque token that we can't interpret. NSPR Logs will
    // have the hex of all packets so there is no point in separately logging.
    LOG3(("Http2Session::RecvGoAway %p GOAWAY had wrong amount of data %d",
          self, self->mInputFrameDataSize));
    RETURN_SESSION_ERROR(self, PROTOCOL_ERROR);
  }

  if (self->mInputFrameID) {
    LOG3(("Http2Session::RecvGoAway %p GOAWAY had non zero stream ID 0x%X\n",
          self, self->mInputFrameID));
    RETURN_SESSION_ERROR(self, PROTOCOL_ERROR);
  }

  self->mShouldGoAway = true;
  self->mGoAwayID = NetworkEndian::readUint32(
      self->mInputFrameBuffer.get() + kFrameHeaderBytes);
  self->mGoAwayID &= 0x7fffffff;
  self->mCleanShutdown = true;
  self->mPeerGoAwayReason = NetworkEndian::readUint32(
      self->mInputFrameBuffer.get() + kFrameHeaderBytes + 4);

  // Find streams greater than the last-good ID and mark them for deletion
  // in the mGoAwayStreamsToRestart queue. The underlying transaction can be
  // restarted.
  for (auto iter = self->mStreamTransactionHash.Iter();
       !iter.Done();
       iter.Next()) {
    // these streams were not processed by the server and can be restarted.
    // Do that after the enumerator completes to avoid the risk of
    // a restart event re-entrantly modifying this hash. Be sure not to restart
    // a pushed (even numbered) stream
    nsAutoPtr<Http2Stream>& stream = iter.Data();
    if ((stream->StreamID() > self->mGoAwayID && (stream->StreamID() & 1)) ||
        !stream->HasRegisteredID()) {
      self->mGoAwayStreamsToRestart.Push(stream);
    }
  }

  // Process the streams marked for deletion and restart.
  size_t size = self->mGoAwayStreamsToRestart.GetSize();
  for (size_t count = 0; count < size; ++count) {
    Http2Stream *stream =
      static_cast<Http2Stream *>(self->mGoAwayStreamsToRestart.PopFront());

    if (self->mPeerGoAwayReason == HTTP_1_1_REQUIRED) {
      stream->Transaction()->DisableSpdy();
    }
    self->CloseStream(stream, NS_ERROR_NET_RESET);
    if (stream->HasRegisteredID())
      self->mStreamIDHash.Remove(stream->StreamID());
    self->mStreamTransactionHash.Remove(stream->Transaction());
  }

  // Queued streams can also be deleted from this session and restarted
  // in another one. (they were never sent on the network so they implicitly
  // are not covered by the last-good id.
  size = self->mQueuedStreams.GetSize();
  for (size_t count = 0; count < size; ++count) {
    Http2Stream *stream =
      static_cast<Http2Stream *>(self->mQueuedStreams.PopFront());
    MOZ_ASSERT(stream->Queued());
    stream->SetQueued(false);
    if (self->mPeerGoAwayReason == HTTP_1_1_REQUIRED) {
      stream->Transaction()->DisableSpdy();
    }
    self->CloseStream(stream, NS_ERROR_NET_RESET);
    self->mStreamTransactionHash.Remove(stream->Transaction());
  }

  LOG3(("Http2Session::RecvGoAway %p GOAWAY Last-Good-ID 0x%X status 0x%X "
        "live streams=%d\n", self, self->mGoAwayID, self->mPeerGoAwayReason,
        self->mStreamTransactionHash.Count()));

  self->ResetDownstreamState();
  return NS_OK;
}

nsresult
Http2Session::RecvWindowUpdate(Http2Session *self)
{
  MOZ_ASSERT(self->mInputFrameType == FRAME_TYPE_WINDOW_UPDATE);

  if (self->mInputFrameDataSize != 4) {
    LOG3(("Http2Session::RecvWindowUpdate %p Window Update wrong length %d\n",
          self, self->mInputFrameDataSize));
    RETURN_SESSION_ERROR(self, PROTOCOL_ERROR);
  }

  uint32_t delta = NetworkEndian::readUint32(
      self->mInputFrameBuffer.get() + kFrameHeaderBytes);
  delta &= 0x7fffffff;

  LOG3(("Http2Session::RecvWindowUpdate %p len=%d Stream 0x%X.\n",
        self, delta, self->mInputFrameID));

  if (self->mInputFrameID) { // stream window
    nsresult rv = self->SetInputFrameDataStream(self->mInputFrameID);
    if (NS_FAILED(rv))
      return rv;

    if (!self->mInputFrameDataStream) {
      LOG3(("Http2Session::RecvWindowUpdate %p lookup streamID 0x%X failed.\n",
            self, self->mInputFrameID));
      // only resest the session if the ID is one we haven't ever opened
      if (self->mInputFrameID >= self->mNextStreamID)
        self->GenerateRstStream(PROTOCOL_ERROR, self->mInputFrameID);
      self->ResetDownstreamState();
      return NS_OK;
    }

    if (delta == 0) {
      LOG3(("Http2Session::RecvWindowUpdate %p received 0 stream window update",
            self));
      self->CleanupStream(self->mInputFrameDataStream, NS_ERROR_ILLEGAL_VALUE,
                          PROTOCOL_ERROR);
      self->ResetDownstreamState();
      return NS_OK;
    }

    int64_t oldRemoteWindow = self->mInputFrameDataStream->ServerReceiveWindow();
    self->mInputFrameDataStream->UpdateServerReceiveWindow(delta);
    if (self->mInputFrameDataStream->ServerReceiveWindow() >= 0x80000000) {
      // a window cannot reach 2^31 and be in compliance. Our calculations
      // are 64 bit safe though.
      LOG3(("Http2Session::RecvWindowUpdate %p stream window "
            "exceeds 2^31 - 1\n", self));
      self->CleanupStream(self->mInputFrameDataStream, NS_ERROR_ILLEGAL_VALUE,
                          FLOW_CONTROL_ERROR);
      self->ResetDownstreamState();
      return NS_OK;
    }

    LOG3(("Http2Session::RecvWindowUpdate %p stream 0x%X window "
          "%d increased by %d now %d.\n", self, self->mInputFrameID,
          oldRemoteWindow, delta, oldRemoteWindow + delta));

  } else { // session window update
    if (delta == 0) {
      LOG3(("Http2Session::RecvWindowUpdate %p received 0 session window update",
            self));
      RETURN_SESSION_ERROR(self, PROTOCOL_ERROR);
    }

    int64_t oldRemoteWindow = self->mServerSessionWindow;
    self->mServerSessionWindow += delta;

    if (self->mServerSessionWindow >= 0x80000000) {
      // a window cannot reach 2^31 and be in compliance. Our calculations
      // are 64 bit safe though.
      LOG3(("Http2Session::RecvWindowUpdate %p session window "
            "exceeds 2^31 - 1\n", self));
      RETURN_SESSION_ERROR(self, FLOW_CONTROL_ERROR);
    }

    if ((oldRemoteWindow <= 0) && (self->mServerSessionWindow > 0)) {
      LOG3(("Http2Session::RecvWindowUpdate %p restart session window\n",
            self));
      for (auto iter = self->mStreamTransactionHash.Iter();
           !iter.Done();
           iter.Next()) {
        MOZ_ASSERT(self->mServerSessionWindow > 0);

        nsAutoPtr<Http2Stream>& stream = iter.Data();
        if (!stream->BlockedOnRwin() || stream->ServerReceiveWindow() <= 0) {
          continue;
        }

        self->mReadyForWrite.Push(stream);
        self->SetWriteCallbacks();
      }
    }
    LOG3(("Http2Session::RecvWindowUpdate %p session window "
          "%d increased by %d now %d.\n", self,
          oldRemoteWindow, delta, oldRemoteWindow + delta));
  }

  self->ResetDownstreamState();
  return NS_OK;
}

nsresult
Http2Session::RecvContinuation(Http2Session *self)
{
  MOZ_ASSERT(self->mInputFrameType == FRAME_TYPE_CONTINUATION);
  MOZ_ASSERT(self->mInputFrameID);
  MOZ_ASSERT(self->mExpectedPushPromiseID || self->mExpectedHeaderID);
  MOZ_ASSERT(!(self->mExpectedPushPromiseID && self->mExpectedHeaderID));

  LOG3(("Http2Session::RecvContinuation %p Flags 0x%X id 0x%X "
        "promise id 0x%X header id 0x%X\n",
        self, self->mInputFrameFlags, self->mInputFrameID,
        self->mExpectedPushPromiseID, self->mExpectedHeaderID));

  self->SetInputFrameDataStream(self->mInputFrameID);

  if (!self->mInputFrameDataStream) {
    LOG3(("Http2Session::RecvContination stream ID 0x%X not found.",
          self->mInputFrameID));
    RETURN_SESSION_ERROR(self, PROTOCOL_ERROR);
  }

  // continued headers
  if (self->mExpectedHeaderID) {
    self->mInputFrameFlags &= ~kFlag_PRIORITY;
    return RecvHeaders(self);
  }

  // continued push promise
  if (self->mInputFrameFlags & kFlag_END_HEADERS) {
    self->mInputFrameFlags &= ~kFlag_END_HEADERS;
    self->mInputFrameFlags |= kFlag_END_PUSH_PROMISE;
  }
  return RecvPushPromise(self);
}

class UpdateAltSvcEvent : public Runnable
{
public:
UpdateAltSvcEvent(const nsCString &header,
                  const nsCString &aOrigin,
                  nsHttpConnectionInfo *aCI,
                  nsIInterfaceRequestor *callbacks)
    : mHeader(header)
    , mOrigin(aOrigin)
    , mCI(aCI)
    , mCallbacks(callbacks)
  {
  }

  NS_IMETHOD Run() override
  {
    MOZ_ASSERT(NS_IsMainThread());

    nsCString originScheme;
    nsCString originHost;
    int32_t originPort = -1;

    nsCOMPtr<nsIURI> uri;
    if (NS_FAILED(NS_NewURI(getter_AddRefs(uri), mOrigin))) {
      LOG(("UpdateAltSvcEvent origin does not parse %s\n",
           mOrigin.get()));
      return NS_OK;
    }
    uri->GetScheme(originScheme);
    uri->GetHost(originHost);
    uri->GetPort(&originPort);

    AltSvcMapping::ProcessHeader(mHeader, originScheme, originHost, originPort,
                                 mCI->GetUsername(), mCI->GetPrivate(), mCallbacks,
                                 mCI->ProxyInfo(), 0, mCI->GetOriginAttributes());
    return NS_OK;
  }

private:
  nsCString mHeader;
  nsCString mOrigin;
  RefPtr<nsHttpConnectionInfo> mCI;
  nsCOMPtr<nsIInterfaceRequestor> mCallbacks;
};

// defined as an http2 extension - alt-svc
// defines receipt of frame type 0x0A.. See AlternateSevices.h at least draft -06 sec 4
// as this is an extension, never generate protocol error - just ignore problems
nsresult
Http2Session::RecvAltSvc(Http2Session *self)
{
  MOZ_ASSERT(self->mInputFrameType == FRAME_TYPE_ALTSVC);
  LOG3(("Http2Session::RecvAltSvc %p Flags 0x%X id 0x%X\n", self,
        self->mInputFrameFlags, self->mInputFrameID));

  if (self->mInputFrameDataSize < 2) {
    LOG3(("Http2Session::RecvAltSvc %p frame too small", self));
    self->ResetDownstreamState();
    return NS_OK;
  }

  uint16_t originLen = NetworkEndian::readUint16(
      self->mInputFrameBuffer.get() + kFrameHeaderBytes);
  if (originLen + 2U > self->mInputFrameDataSize) {
    LOG3(("Http2Session::RecvAltSvc %p origin len too big for frame", self));
    self->ResetDownstreamState();
    return NS_OK;
  }

  if (!gHttpHandler->AllowAltSvc()) {
    LOG3(("Http2Session::RecvAltSvc %p frame alt service pref'd off", self));
    self->ResetDownstreamState();
    return NS_OK;
  }

  uint16_t altSvcFieldValueLen = static_cast<uint16_t>(self->mInputFrameDataSize) - 2U - originLen;
  LOG3(("Http2Session::RecvAltSvc %p frame originLen=%u altSvcFieldValueLen=%u\n",
        self, originLen, altSvcFieldValueLen));

  if (self->mInputFrameDataSize > 2000) {
    LOG3(("Http2Session::RecvAltSvc %p frame too large to parse sensibly", self));
    self->ResetDownstreamState();
    return NS_OK;
  }

  nsAutoCString origin;
  bool impliedOrigin = true;
  if (originLen) {
    origin.Assign(self->mInputFrameBuffer.get() + kFrameHeaderBytes + 2, originLen);
    impliedOrigin = false;
  }

  nsAutoCString altSvcFieldValue;
  if (altSvcFieldValueLen) {
    altSvcFieldValue.Assign(self->mInputFrameBuffer.get() + kFrameHeaderBytes + 2 + originLen,
                            altSvcFieldValueLen);
  }

  if (altSvcFieldValue.IsEmpty() || !nsHttp::IsReasonableHeaderValue(altSvcFieldValue)) {
    LOG(("Http2Session %p Alt-Svc Response Header seems unreasonable - skipping\n", self));
    self->ResetDownstreamState();
    return NS_OK;
  }

  if (self->mInputFrameID & 1) {
    // pulled streams apply to the origin of the pulled stream.
    // If the origin field is filled in the frame, the frame should be ignored
    if (!origin.IsEmpty()) {
      LOG(("Http2Session %p Alt-Svc pulled stream has non empty origin\n", self));
      self->ResetDownstreamState();
      return NS_OK;
    }
    
    if (NS_FAILED(self->SetInputFrameDataStream(self->mInputFrameID)) ||
        !self->mInputFrameDataStream->Transaction() ||
        !self->mInputFrameDataStream->Transaction()->RequestHead()) {
      LOG3(("Http2Session::RecvAltSvc %p got frame w/o origin on invalid stream", self));
      self->ResetDownstreamState();
      return NS_OK;
    }

    self->mInputFrameDataStream->Transaction()->RequestHead()->Origin(origin);
  } else if (!self->mInputFrameID) {
    // ID 0 streams must supply their own origin
    if (origin.IsEmpty()) {
      LOG(("Http2Session %p Alt-Svc Stream 0 has empty origin\n", self));
      self->ResetDownstreamState();
      return NS_OK;
    }
  } else {
    // handling of push streams is not defined. Let's ignore it
    LOG(("Http2Session %p Alt-Svc received on pushed stream - ignoring\n", self));
    self->ResetDownstreamState();
    return NS_OK;
  }

  RefPtr<nsHttpConnectionInfo> ci(self->ConnectionInfo());
  if (!self->mConnection || !ci) {
    LOG3(("Http2Session::RecvAltSvc %p no connection or conninfo for %d", self,
          self->mInputFrameID));
    self->ResetDownstreamState();
    return NS_OK;
  }

  if (!impliedOrigin) {
    bool okToReroute = true;
    nsCOMPtr<nsISupports> securityInfo;
    self->mConnection->GetSecurityInfo(getter_AddRefs(securityInfo));
    nsCOMPtr<nsISSLSocketControl> ssl = do_QueryInterface(securityInfo);
    if (!ssl) {
      okToReroute = false;
    }

    // a little off main thread origin parser. This is a non critical function because
    // any alternate route created has to be verified anyhow
    nsAutoCString specifiedOriginHost;
    if (origin.EqualsIgnoreCase("https://", 8)) {
      specifiedOriginHost.Assign(origin.get() + 8, origin.Length() - 8);
    } else if (origin.EqualsIgnoreCase("http://", 7)) {
      specifiedOriginHost.Assign(origin.get() + 7, origin.Length() - 7);
    }

    int32_t colonOffset = specifiedOriginHost.FindCharInSet(":", 0);
    if (colonOffset != kNotFound) {
      specifiedOriginHost.Truncate(colonOffset);
    }

    if (okToReroute) {
      ssl->IsAcceptableForHost(specifiedOriginHost, &okToReroute);
    }

    if (!okToReroute) {
      LOG3(("Http2Session::RecvAltSvc %p can't reroute non-authoritative origin %s",
            self, origin.BeginReading()));
      self->ResetDownstreamState();
      return NS_OK;
    }
  }

  nsCOMPtr<nsISupports> callbacks;
  self->mConnection->GetSecurityInfo(getter_AddRefs(callbacks));
  nsCOMPtr<nsIInterfaceRequestor> irCallbacks = do_QueryInterface(callbacks);

  RefPtr<UpdateAltSvcEvent> event =
    new UpdateAltSvcEvent(altSvcFieldValue, origin, ci, irCallbacks);
  NS_DispatchToMainThread(event);
  self->ResetDownstreamState();
  return NS_OK;
}

//-----------------------------------------------------------------------------
// nsAHttpTransaction. It is expected that nsHttpConnection is the caller
// of these methods
//-----------------------------------------------------------------------------

void
Http2Session::OnTransportStatus(nsITransport* aTransport,
                                nsresult aStatus, int64_t aProgress)
{
  MOZ_ASSERT(PR_GetCurrentThread() == gSocketThread);

  switch (aStatus) {
    // These should appear only once, deliver to the first
    // transaction on the session.
  case NS_NET_STATUS_RESOLVING_HOST:
  case NS_NET_STATUS_RESOLVED_HOST:
  case NS_NET_STATUS_CONNECTING_TO:
  case NS_NET_STATUS_CONNECTED_TO:
  case NS_NET_STATUS_TLS_HANDSHAKE_STARTING:
  case NS_NET_STATUS_TLS_HANDSHAKE_ENDED:
  {
    Http2Stream *target = mStreamIDHash.Get(1);
    if (!target) {
      // any transaction will do if we can't find the low numbered one
      // generally this happens when the initial transaction hasn't been
      // assigned a stream id yet.
      auto iter = mStreamTransactionHash.Iter();
      if (!iter.Done()) {
        target = iter.Data();
      }
    }
    nsAHttpTransaction *transaction = target ? target->Transaction() : nullptr;
    if (transaction)
      transaction->OnTransportStatus(aTransport, aStatus, aProgress);
    break;
  }

  default:
    // The other transport events are ignored here because there is no good
    // way to map them to the right transaction in http/2. Instead, the events
    // are generated again from the http/2 code and passed directly to the
    // correct transaction.

    // NS_NET_STATUS_SENDING_TO:
    // This is generated by the socket transport when (part) of
    // a transaction is written out
    //
    // There is no good way to map it to the right transaction in http/2,
    // so it is ignored here and generated separately when the request
    // is sent from Http2Stream::TransmitFrame

    // NS_NET_STATUS_WAITING_FOR:
    // Created by nsHttpConnection when the request has been totally sent.
    // There is no good way to map it to the right transaction in http/2,
    // so it is ignored here and generated separately when the same
    // condition is complete in Http2Stream when there is no more
    // request body left to be transmitted.

    // NS_NET_STATUS_RECEIVING_FROM
    // Generated in session whenever we read a data frame or a HEADERS
    // that can be attributed to a particular stream/transaction

    break;
  }
}

// ReadSegments() is used to write data to the network. Generally, HTTP
// request data is pulled from the approriate transaction and
// converted to http/2 data. Sometimes control data like window-update are
// generated instead.

nsresult
Http2Session::ReadSegmentsAgain(nsAHttpSegmentReader *reader,
                                uint32_t count, uint32_t *countRead, bool *again)
{
  MOZ_ASSERT(PR_GetCurrentThread() == gSocketThread);

  MOZ_ASSERT(!mSegmentReader || !reader || (mSegmentReader == reader),
             "Inconsistent Write Function Callback");

  nsresult rv = ConfirmTLSProfile();
  if (NS_FAILED(rv)) {
    if (mGoAwayReason == INADEQUATE_SECURITY) {
      LOG3(("Http2Session::ReadSegments %p returning INADEQUATE_SECURITY %x",
            this, NS_ERROR_NET_INADEQUATE_SECURITY));
      rv = NS_ERROR_NET_INADEQUATE_SECURITY;
    }
    return rv;
  }

  if (reader)
    mSegmentReader = reader;

  *countRead = 0;

  LOG3(("Http2Session::ReadSegments %p", this));

  Http2Stream *stream = static_cast<Http2Stream *>(mReadyForWrite.PopFront());
  if (!stream) {
    LOG3(("Http2Session %p could not identify a stream to write; suspending.",
          this));
    uint32_t availBeforeFlush = mOutputQueueUsed - mOutputQueueSent;
    FlushOutputQueue();
    uint32_t availAfterFlush = mOutputQueueUsed - mOutputQueueSent;
    if (availBeforeFlush != availAfterFlush) {
      LOG3(("Http2Session %p ResumeRecv After early flush in ReadSegments", this));
      Unused << ResumeRecv();
    }
    SetWriteCallbacks();
    if (mAttemptingEarlyData) {
      // We can still try to send our preamble as early-data
      *countRead = mOutputQueueUsed - mOutputQueueSent;
    }
    return *countRead ? NS_OK : NS_BASE_STREAM_WOULD_BLOCK;
  }

  uint32_t earlyDataUsed = 0;
  if (mAttemptingEarlyData) {
    if (!stream->Do0RTT()) {
      LOG3(("Http2Session %p will not get early data from Http2Stream %p 0x%X",
            this, stream, stream->StreamID()));
      FlushOutputQueue();
      SetWriteCallbacks();
      // We can still send our preamble
      *countRead = mOutputQueueUsed - mOutputQueueSent;
      return *countRead ? NS_OK : NS_BASE_STREAM_WOULD_BLOCK;
    }

    if (!m0RTTStreams.Contains(stream->StreamID())) {
      m0RTTStreams.AppendElement(stream->StreamID());
    }

    // Need to adjust this to only take as much as we can fit in with the
    // preamble/settings/priority stuff
    count -= (mOutputQueueUsed - mOutputQueueSent);

    // Keep track of this to add it into countRead later, as
    // stream->ReadSegments will likely change the value of mOutputQueueUsed.
    earlyDataUsed = mOutputQueueUsed - mOutputQueueSent;
  }

  LOG3(("Http2Session %p will write from Http2Stream %p 0x%X "
        "block-input=%d block-output=%d\n", this, stream, stream->StreamID(),
        stream->RequestBlockedOnRead(), stream->BlockedOnRwin()));

  rv = stream->ReadSegments(this, count, countRead);

  if (earlyDataUsed) {
    // Do this here because countRead could get reset somewhere down the rabbit
    // hole of stream->ReadSegments, and we want to make sure we return the
    // proper value to our caller.
    *countRead += earlyDataUsed;
  }

  // Not every permutation of stream->ReadSegents produces data (and therefore
  // tries to flush the output queue) - SENDING_FIN_STREAM can be an example
  // of that. But we might still have old data buffered that would be good
  // to flush.
  FlushOutputQueue();

  // Allow new server reads - that might be data or control information
  // (e.g. window updates or http replies) that are responses to these writes
  ResumeRecv();

  if (stream->RequestBlockedOnRead()) {

    // We are blocked waiting for input - either more http headers or
    // any request body data. When more data from the request stream
    // becomes available the httptransaction will call conn->ResumeSend().

    LOG3(("Http2Session::ReadSegments %p dealing with block on read", this));

    // call readsegments again if there are other streams ready
    // to run in this session
    if (GetWriteQueueSize()) {
      rv = NS_OK;
    } else {
      rv = NS_BASE_STREAM_WOULD_BLOCK;
    }
    SetWriteCallbacks();
    return rv;
  }

  if (NS_FAILED(rv)) {
    LOG3(("Http2Session::ReadSegments %p may return FAIL code %X",
          this, rv));
    if (rv == NS_BASE_STREAM_WOULD_BLOCK) {
      return rv;
    }

    CleanupStream(stream, rv, CANCEL_ERROR);
    if (SoftStreamError(rv)) {
      LOG3(("Http2Session::ReadSegments %p soft error override\n", this));
      *again = false;
      SetWriteCallbacks();
      rv = NS_OK;
    }
    return rv;
  }

  if (*countRead > 0) {
    LOG3(("Http2Session::ReadSegments %p stream=%p countread=%d",
          this, stream, *countRead));
    mReadyForWrite.Push(stream);
    SetWriteCallbacks();
    return rv;
  }

  if (stream->BlockedOnRwin()) {
    LOG3(("Http2Session %p will stream %p 0x%X suspended for flow control\n",
          this, stream, stream->StreamID()));
    return NS_BASE_STREAM_WOULD_BLOCK;
  }

  LOG3(("Http2Session::ReadSegments %p stream=%p stream send complete",
        this, stream));

  // call readsegments again if there are other streams ready
  // to go in this session
  SetWriteCallbacks();

  return rv;
}

nsresult
Http2Session::ReadSegments(nsAHttpSegmentReader *reader,
                           uint32_t count, uint32_t *countRead)
{
  bool again = false;
  return ReadSegmentsAgain(reader, count, countRead, &again);
}

nsresult
Http2Session::ReadyToProcessDataFrame(enum internalStateType newState)
{
  MOZ_ASSERT(newState == PROCESSING_DATA_FRAME ||
             newState == DISCARDING_DATA_FRAME_PADDING);
  ChangeDownstreamState(newState);

  Telemetry::Accumulate(Telemetry::SPDY_CHUNK_RECVD,
                        mInputFrameDataSize >> 10);
  mLastDataReadEpoch = mLastReadEpoch;

  if (!mInputFrameID) {
    LOG3(("Http2Session::ReadyToProcessDataFrame %p data frame stream 0\n",
          this));
    RETURN_SESSION_ERROR(this, PROTOCOL_ERROR);
  }

  nsresult rv = SetInputFrameDataStream(mInputFrameID);
  if (NS_FAILED(rv)) {
    LOG3(("Http2Session::ReadyToProcessDataFrame %p lookup streamID 0x%X "
          "failed. probably due to verification.\n", this, mInputFrameID));
    return rv;
  }
  if (!mInputFrameDataStream) {
    LOG3(("Http2Session::ReadyToProcessDataFrame %p lookup streamID 0x%X "
          "failed. Next = 0x%X", this, mInputFrameID, mNextStreamID));
    if (mInputFrameID >= mNextStreamID)
      GenerateRstStream(PROTOCOL_ERROR, mInputFrameID);
    ChangeDownstreamState(DISCARDING_DATA_FRAME);
  } else if (mInputFrameDataStream->RecvdFin() ||
            mInputFrameDataStream->RecvdReset() ||
            mInputFrameDataStream->SentReset()) {
    LOG3(("Http2Session::ReadyToProcessDataFrame %p streamID 0x%X "
          "Data arrived for already server closed stream.\n",
          this, mInputFrameID));
    if (mInputFrameDataStream->RecvdFin() || mInputFrameDataStream->RecvdReset())
      GenerateRstStream(STREAM_CLOSED_ERROR, mInputFrameID);
    ChangeDownstreamState(DISCARDING_DATA_FRAME);
  } else if (mInputFrameDataSize == 0 && !mInputFrameFinal) {
    // Only if non-final because the stream properly handles final frames of any
    // size, and we want the stream to be able to notice its own end flag.
    LOG3(("Http2Session::ReadyToProcessDataFrame %p streamID 0x%X "
          "Ignoring 0-length non-terminal data frame.", this, mInputFrameID));
    ChangeDownstreamState(DISCARDING_DATA_FRAME);
  }

  LOG3(("Start Processing Data Frame. "
        "Session=%p Stream ID 0x%X Stream Ptr %p Fin=%d Len=%d",
        this, mInputFrameID, mInputFrameDataStream, mInputFrameFinal,
        mInputFrameDataSize));
  UpdateLocalRwin(mInputFrameDataStream, mInputFrameDataSize);

  if (mInputFrameDataStream) {
    mInputFrameDataStream->SetRecvdData(true);
  }

  return NS_OK;
}

// WriteSegments() is used to read data off the socket. Generally this is
// just the http2 frame header and from there the appropriate *Stream
// is identified from the Stream-ID. The http transaction associated with
// that read then pulls in the data directly, which it will feed to
// OnWriteSegment(). That function will gateway it into http and feed
// it to the appropriate transaction.

// we call writer->OnWriteSegment via NetworkRead() to get a http2 header..
// and decide if it is data or control.. if it is control, just deal with it.
// if it is data, identify the stream
// call stream->WriteSegments which can call this::OnWriteSegment to get the
// data. It always gets full frames if they are part of the stream

nsresult
Http2Session::WriteSegmentsAgain(nsAHttpSegmentWriter *writer,
                                 uint32_t count, uint32_t *countWritten,
                                 bool *again)
{
  MOZ_ASSERT(PR_GetCurrentThread() == gSocketThread);

  LOG3(("Http2Session::WriteSegments %p InternalState %X\n",
        this, mDownstreamState));

  *countWritten = 0;

  if (mClosed)
    return NS_ERROR_FAILURE;

  nsresult rv = ConfirmTLSProfile();
  if (NS_FAILED(rv))
    return rv;

  SetWriteCallbacks();

  // If there are http transactions attached to a push stream with filled buffers
  // trigger that data pump here. This only reads from buffers (not the network)
  // so mDownstreamState doesn't matter.
  Http2Stream *pushConnectedStream =
    static_cast<Http2Stream *>(mPushesReadyForRead.PopFront());
  if (pushConnectedStream) {
    return ProcessConnectedPush(pushConnectedStream, writer, count, countWritten);
  }

  // feed gecko channels that previously stopped consuming data
  // only take data from stored buffers
  Http2Stream *slowConsumer =
    static_cast<Http2Stream *>(mSlowConsumersReadyForRead.PopFront());
  if (slowConsumer) {
    internalStateType savedState = mDownstreamState;
    mDownstreamState = NOT_USING_NETWORK;
    rv = ProcessSlowConsumer(slowConsumer, writer, count, countWritten);
    mDownstreamState = savedState;
    return rv;
  }

  // The BUFFERING_OPENING_SETTINGS state is just like any BUFFERING_FRAME_HEADER
  // except the only frame type it will allow is SETTINGS

  // The session layer buffers the leading 8 byte header of every frame.
  // Non-Data frames are then buffered for their full length, but data
  // frames (type 0) are passed through to the http stack unprocessed

  if (mDownstreamState == BUFFERING_OPENING_SETTINGS ||
      mDownstreamState == BUFFERING_FRAME_HEADER) {
    // The first 9 bytes of every frame is header information that
    // we are going to want to strip before passing to http. That is
    // true of both control and data packets.

    MOZ_ASSERT(mInputFrameBufferUsed < kFrameHeaderBytes,
               "Frame Buffer Used Too Large for State");

    rv = NetworkRead(writer, &mInputFrameBuffer[mInputFrameBufferUsed],
                     kFrameHeaderBytes - mInputFrameBufferUsed, countWritten);

    if (NS_FAILED(rv)) {
      LOG3(("Http2Session %p buffering frame header read failure %x\n",
            this, rv));
      // maybe just blocked reading from network
      if (rv == NS_BASE_STREAM_WOULD_BLOCK)
        rv = NS_OK;
      return rv;
    }

    LogIO(this, nullptr, "Reading Frame Header",
          &mInputFrameBuffer[mInputFrameBufferUsed], *countWritten);

    mInputFrameBufferUsed += *countWritten;

    if (mInputFrameBufferUsed < kFrameHeaderBytes)
    {
      LOG3(("Http2Session::WriteSegments %p "
            "BUFFERING FRAME HEADER incomplete size=%d",
            this, mInputFrameBufferUsed));
      return rv;
    }

    // 3 bytes of length, 1 type byte, 1 flag byte, 1 unused bit, 31 bits of ID
    uint8_t totallyWastedByte = mInputFrameBuffer.get()[0];
    mInputFrameDataSize = NetworkEndian::readUint16(
        mInputFrameBuffer.get() + 1);
    if (totallyWastedByte || (mInputFrameDataSize > kMaxFrameData)) {
      LOG3(("Got frame too large 0x%02X%04X", totallyWastedByte, mInputFrameDataSize));
      RETURN_SESSION_ERROR(this, PROTOCOL_ERROR);
    }
    mInputFrameType = *reinterpret_cast<uint8_t *>(mInputFrameBuffer.get() + kFrameLengthBytes);
    mInputFrameFlags = *reinterpret_cast<uint8_t *>(mInputFrameBuffer.get() + kFrameLengthBytes + kFrameTypeBytes);
    mInputFrameID = NetworkEndian::readUint32(
        mInputFrameBuffer.get() + kFrameLengthBytes + kFrameTypeBytes + kFrameFlagBytes);
    mInputFrameID &= 0x7fffffff;
    mInputFrameDataRead = 0;

    if (mInputFrameType == FRAME_TYPE_DATA || mInputFrameType == FRAME_TYPE_HEADERS)  {
      mInputFrameFinal = mInputFrameFlags & kFlag_END_STREAM;
    } else {
      mInputFrameFinal = 0;
    }

    mPaddingLength = 0;

    LOG3(("Http2Session::WriteSegments[%p::%x] Frame Header Read "
          "type %X data len %u flags %x id 0x%X",
          this, mSerial, mInputFrameType, mInputFrameDataSize, mInputFrameFlags,
          mInputFrameID));

    // if mExpectedHeaderID is non 0, it means this frame must be a CONTINUATION of
    // a HEADERS frame with a matching ID (section 6.2)
    if (mExpectedHeaderID &&
        ((mInputFrameType != FRAME_TYPE_CONTINUATION) ||
         (mExpectedHeaderID != mInputFrameID))) {
      LOG3(("Expected CONINUATION OF HEADERS for ID 0x%X\n", mExpectedHeaderID));
      RETURN_SESSION_ERROR(this, PROTOCOL_ERROR);
    }

    // if mExpectedPushPromiseID is non 0, it means this frame must be a
    // CONTINUATION of a PUSH_PROMISE with a matching ID (section 6.2)
    if (mExpectedPushPromiseID &&
        ((mInputFrameType != FRAME_TYPE_CONTINUATION) ||
         (mExpectedPushPromiseID != mInputFrameID))) {
      LOG3(("Expected CONTINUATION of PUSH PROMISE for ID 0x%X\n",
            mExpectedPushPromiseID));
      RETURN_SESSION_ERROR(this, PROTOCOL_ERROR);
    }

    if (mDownstreamState == BUFFERING_OPENING_SETTINGS &&
        mInputFrameType != FRAME_TYPE_SETTINGS) {
      LOG3(("First Frame Type Must Be Settings\n"));
      RETURN_SESSION_ERROR(this, PROTOCOL_ERROR);
    }

    if (mInputFrameType != FRAME_TYPE_DATA) { // control frame
      EnsureBuffer(mInputFrameBuffer, mInputFrameDataSize + kFrameHeaderBytes,
                   kFrameHeaderBytes, mInputFrameBufferSize);
      ChangeDownstreamState(BUFFERING_CONTROL_FRAME);
    } else if (mInputFrameFlags & kFlag_PADDED) {
      ChangeDownstreamState(PROCESSING_DATA_FRAME_PADDING_CONTROL);
    } else {
      rv = ReadyToProcessDataFrame(PROCESSING_DATA_FRAME);
      if (NS_FAILED(rv)) {
        return rv;
      }
    }
  }

  if (mDownstreamState == PROCESSING_DATA_FRAME_PADDING_CONTROL) {
    MOZ_ASSERT(mInputFrameFlags & kFlag_PADDED,
               "Processing padding control on unpadded frame");

    MOZ_ASSERT(mInputFrameBufferUsed < (kFrameHeaderBytes + 1),
               "Frame buffer used too large for state");

    rv = NetworkRead(writer, &mInputFrameBuffer[mInputFrameBufferUsed],
                     (kFrameHeaderBytes + 1) - mInputFrameBufferUsed,
                     countWritten);

    if (NS_FAILED(rv)) {
      LOG3(("Http2Session %p buffering data frame padding control read failure %x\n",
            this, rv));
      // maybe just blocked reading from network
      if (rv == NS_BASE_STREAM_WOULD_BLOCK)
        rv = NS_OK;
      return rv;
    }

    LogIO(this, nullptr, "Reading Data Frame Padding Control",
          &mInputFrameBuffer[mInputFrameBufferUsed], *countWritten);

    mInputFrameBufferUsed += *countWritten;

    if (mInputFrameBufferUsed - kFrameHeaderBytes < 1) {
      LOG3(("Http2Session::WriteSegments %p "
            "BUFFERING DATA FRAME CONTROL PADDING incomplete size=%d",
            this, mInputFrameBufferUsed - 8));
      return rv;
    }

    ++mInputFrameDataRead;

    char *control = &mInputFrameBuffer[kFrameHeaderBytes];
    mPaddingLength = static_cast<uint8_t>(*control);

    LOG3(("Http2Session::WriteSegments %p stream 0x%X mPaddingLength=%d", this,
          mInputFrameID, mPaddingLength));

    if (1U + mPaddingLength > mInputFrameDataSize) {
      LOG3(("Http2Session::WriteSegments %p stream 0x%X padding too large for "
            "frame", this, mInputFrameID));
      RETURN_SESSION_ERROR(this, PROTOCOL_ERROR);
    } else if (1U + mPaddingLength == mInputFrameDataSize) {
      // This frame consists entirely of padding, we can just discard it
      LOG3(("Http2Session::WriteSegments %p stream 0x%X frame with only padding",
            this, mInputFrameID));
      rv = ReadyToProcessDataFrame(DISCARDING_DATA_FRAME_PADDING);
      if (NS_FAILED(rv)) {
        return rv;
      }
    } else {
      LOG3(("Http2Session::WriteSegments %p stream 0x%X ready to read HTTP data",
            this, mInputFrameID));
      rv = ReadyToProcessDataFrame(PROCESSING_DATA_FRAME);
      if (NS_FAILED(rv)) {
        return rv;
      }
    }
  }

  if (mDownstreamState == PROCESSING_CONTROL_RST_STREAM) {
    nsresult streamCleanupCode;

    // There is no bounds checking on the error code.. we provide special
    // handling for a couple of cases and all others (including unknown) are
    // equivalent to cancel.
    if (mDownstreamRstReason == REFUSED_STREAM_ERROR) {
      streamCleanupCode = NS_ERROR_NET_RESET;      // can retry this 100% safely
      mInputFrameDataStream->Transaction()->ReuseConnectionOnRestartOK(true);
    } else if (mDownstreamRstReason == HTTP_1_1_REQUIRED) {
      streamCleanupCode = NS_ERROR_NET_RESET;
      mInputFrameDataStream->Transaction()->ReuseConnectionOnRestartOK(true);
      mInputFrameDataStream->Transaction()->DisableSpdy();
    } else {
      streamCleanupCode = mInputFrameDataStream->RecvdData() ?
        NS_ERROR_NET_PARTIAL_TRANSFER :
        NS_ERROR_NET_INTERRUPT;
    }

    if (mDownstreamRstReason == COMPRESSION_ERROR) {
      mShouldGoAway = true;
    }

    // mInputFrameDataStream is reset by ChangeDownstreamState
    Http2Stream *stream = mInputFrameDataStream;
    ResetDownstreamState();
    LOG3(("Http2Session::WriteSegments cleanup stream on recv of rst "
          "session=%p stream=%p 0x%X\n", this, stream,
          stream ? stream->StreamID() : 0));
    CleanupStream(stream, streamCleanupCode, CANCEL_ERROR);
    return NS_OK;
  }

  if (mDownstreamState == PROCESSING_DATA_FRAME ||
      mDownstreamState == PROCESSING_COMPLETE_HEADERS) {

    // The cleanup stream should only be set while stream->WriteSegments is
    // on the stack and then cleaned up in this code block afterwards.
    MOZ_ASSERT(!mNeedsCleanup, "cleanup stream set unexpectedly");
    mNeedsCleanup = nullptr;                     /* just in case */

    uint32_t streamID = mInputFrameDataStream->StreamID();
    mSegmentWriter = writer;
    rv = mInputFrameDataStream->WriteSegments(this, count, countWritten);
    mSegmentWriter = nullptr;

    mLastDataReadEpoch = mLastReadEpoch;

    if (SoftStreamError(rv)) {
      // This will happen when the transaction figures out it is EOF, generally
      // due to a content-length match being made. Return OK from this function
      // otherwise the whole session would be torn down.

      // if we were doing PROCESSING_COMPLETE_HEADERS need to pop the state
      // back to PROCESSING_DATA_FRAME where we came from
      mDownstreamState = PROCESSING_DATA_FRAME;

      if (mInputFrameDataRead == mInputFrameDataSize)
        ResetDownstreamState();
      LOG3(("Http2Session::WriteSegments session=%p id 0x%X "
            "needscleanup=%p. cleanup stream based on "
            "stream->writeSegments returning code %x\n",
            this, streamID, mNeedsCleanup, rv));
      MOZ_ASSERT(!mNeedsCleanup || mNeedsCleanup->StreamID() == streamID);
      CleanupStream(streamID, NS_OK, CANCEL_ERROR);
      mNeedsCleanup = nullptr;
      *again = false;
      ResumeRecv();
      return NS_OK;
    }

    if (mNeedsCleanup) {
      LOG3(("Http2Session::WriteSegments session=%p stream=%p 0x%X "
            "cleanup stream based on mNeedsCleanup.\n",
            this, mNeedsCleanup, mNeedsCleanup ? mNeedsCleanup->StreamID() : 0));
      CleanupStream(mNeedsCleanup, NS_OK, CANCEL_ERROR);
      mNeedsCleanup = nullptr;
    }

    if (NS_FAILED(rv)) {
      LOG3(("Http2Session %p data frame read failure %x\n", this, rv));
      // maybe just blocked reading from network
      if (rv == NS_BASE_STREAM_WOULD_BLOCK)
        rv = NS_OK;
    }

    return rv;
  }

  if (mDownstreamState == DISCARDING_DATA_FRAME ||
      mDownstreamState == DISCARDING_DATA_FRAME_PADDING) {
    char trash[4096];
    uint32_t discardCount = std::min(mInputFrameDataSize - mInputFrameDataRead,
                                     4096U);
    LOG3(("Http2Session::WriteSegments %p trying to discard %d bytes of data",
          this, discardCount));

    if (!discardCount && mDownstreamState == DISCARDING_DATA_FRAME) {
      // Only do this short-cirtuit if we're not discarding a pure padding
      // frame, as we need to potentially handle the stream FIN in those cases.
      // See bug 1381016 comment 36 for more details.
      ResetDownstreamState();
      ResumeRecv();
      return NS_BASE_STREAM_WOULD_BLOCK;
    }

    rv = NetworkRead(writer, trash, discardCount, countWritten);

    if (NS_FAILED(rv)) {
      LOG3(("Http2Session %p discard frame read failure %x\n", this, rv));
      // maybe just blocked reading from network
      if (rv == NS_BASE_STREAM_WOULD_BLOCK)
        rv = NS_OK;
      return rv;
    }

    LogIO(this, nullptr, "Discarding Frame", trash, *countWritten);

    mInputFrameDataRead += *countWritten;

    if (mInputFrameDataRead == mInputFrameDataSize) {
      Http2Stream *streamToCleanup = nullptr;
      if (mInputFrameFinal) {
        streamToCleanup = mInputFrameDataStream;
      }

      ResetDownstreamState();

      if (streamToCleanup) {
        CleanupStream(streamToCleanup, NS_OK, CANCEL_ERROR);
      }
    }
    return rv;
  }

  if (mDownstreamState != BUFFERING_CONTROL_FRAME) {
    MOZ_ASSERT(false); // this cannot happen
    return NS_ERROR_UNEXPECTED;
  }

  MOZ_ASSERT(mInputFrameBufferUsed == kFrameHeaderBytes, "Frame Buffer Header Not Present");
  MOZ_ASSERT(mInputFrameDataSize + kFrameHeaderBytes <= mInputFrameBufferSize,
             "allocation for control frame insufficient");

  rv = NetworkRead(writer, &mInputFrameBuffer[kFrameHeaderBytes + mInputFrameDataRead],
                   mInputFrameDataSize - mInputFrameDataRead, countWritten);

  if (NS_FAILED(rv)) {
    LOG3(("Http2Session %p buffering control frame read failure %x\n",
          this, rv));
    // maybe just blocked reading from network
    if (rv == NS_BASE_STREAM_WOULD_BLOCK)
      rv = NS_OK;
    return rv;
  }

  LogIO(this, nullptr, "Reading Control Frame",
        &mInputFrameBuffer[kFrameHeaderBytes + mInputFrameDataRead], *countWritten);

  mInputFrameDataRead += *countWritten;

  if (mInputFrameDataRead != mInputFrameDataSize)
    return NS_OK;

  MOZ_ASSERT(mInputFrameType != FRAME_TYPE_DATA);
  if (mInputFrameType < FRAME_TYPE_LAST) {
    rv = sControlFunctions[mInputFrameType](this);
  } else {
    // Section 4.1 requires this to be ignored; though protocol_error would
    // be better
    LOG3(("Http2Session %p unknown frame type %x ignored\n",
          this, mInputFrameType));
    ResetDownstreamState();
    rv = NS_OK;
  }

  MOZ_ASSERT(NS_FAILED(rv) ||
             mDownstreamState != BUFFERING_CONTROL_FRAME,
             "Control Handler returned OK but did not change state");

  if (mShouldGoAway && !mStreamTransactionHash.Count())
    Close(NS_OK);
  return rv;
}

nsresult
Http2Session::WriteSegments(nsAHttpSegmentWriter *writer,
                            uint32_t count, uint32_t *countWritten)
{
  bool again = false;
  return WriteSegmentsAgain(writer, count, countWritten, &again);
}

nsresult
Http2Session::Finish0RTT(bool aRestart, bool aAlpnChanged)
{
  MOZ_ASSERT(mAttemptingEarlyData);
  LOG3(("Http2Session::Finish0RTT %p aRestart=%d aAlpnChanged=%d", this,
        aRestart, aAlpnChanged));

  for (size_t i = 0; i < m0RTTStreams.Length(); ++i) {
    // Instead of passing (aRestart, aAlpnChanged) here, we use aAlpnChanged for
    // both arguments because as long as the alpn token stayed the same, we can
    // just reuse what we have in our buffer to send instead of having to have
    // the transaction rewind and read it all over again. We only need to rewind
    // the transaction if we're switching to a new protocol, because our buffer
    // won't get used in that case.
    Http2Stream *stream = mStreamIDHash.Get(m0RTTStreams[i]);
    if (stream) {
      stream->Finish0RTT(aAlpnChanged, aAlpnChanged);
    }
  }

  if (aRestart) {
    // 0RTT failed
    if (aAlpnChanged) {
      // This is a slightly more involved case - we need to get all our streams/
      // transactions back in the queue so they can restart as http/1

      // These must be set this way to ensure we gracefully restart all streams
      mGoAwayID = 0;
      mCleanShutdown = true;

      // Close takes care of the rest of our work for us. The reason code here
      // doesn't matter, as we aren't actually going to send a GOAWAY frame, but
      // we use NS_ERROR_NET_RESET as it's closest to the truth.
      Close(NS_ERROR_NET_RESET);
    } else {
      // This is the easy case - early data failed, but we're speaking h2, so
      // we just need to rewind to the beginning of the preamble and try again.
      mOutputQueueSent = 0;
    }
  } else {
    // 0RTT succeeded
    // Make sure we look for any incoming data in repsonse to our early data.
    ResumeRecv();
  }

  mAttemptingEarlyData = false;
  m0RTTStreams.Clear();
  RealignOutputQueue();

  return NS_OK;
}

nsresult
Http2Session::ProcessConnectedPush(Http2Stream *pushConnectedStream,
                                   nsAHttpSegmentWriter * writer,
                                   uint32_t count, uint32_t *countWritten)
{
  LOG3(("Http2Session::ProcessConnectedPush %p 0x%X\n",
        this, pushConnectedStream->StreamID()));
  mSegmentWriter = writer;
  nsresult rv = pushConnectedStream->WriteSegments(this, count, countWritten);
  mSegmentWriter = nullptr;

  // The pipe in nsHttpTransaction rewrites CLOSED error codes into OK
  // so we need this check to determine the truth.
  if (NS_SUCCEEDED(rv) && !*countWritten &&
      pushConnectedStream->PushSource() &&
      pushConnectedStream->PushSource()->GetPushComplete()) {
    rv = NS_BASE_STREAM_CLOSED;
  }

  if (rv == NS_BASE_STREAM_CLOSED) {
    CleanupStream(pushConnectedStream, NS_OK, CANCEL_ERROR);
    rv = NS_OK;
  }

  // if we return OK to nsHttpConnection it will use mSocketInCondition
  // to determine whether to schedule more reads, incorrectly
  // assuming that nsHttpConnection::OnSocketWrite() was called.
  if (NS_SUCCEEDED(rv) || rv == NS_BASE_STREAM_WOULD_BLOCK) {
    rv = NS_BASE_STREAM_WOULD_BLOCK;
    ResumeRecv();
  }
  return rv;
}

nsresult
Http2Session::ProcessSlowConsumer(Http2Stream *slowConsumer,
                                  nsAHttpSegmentWriter * writer,
                                  uint32_t count, uint32_t *countWritten)
{
  LOG3(("Http2Session::ProcessSlowConsumer %p 0x%X\n",
        this, slowConsumer->StreamID()));
  mSegmentWriter = writer;
  nsresult rv = slowConsumer->WriteSegments(this, count, countWritten);
  mSegmentWriter = nullptr;
  LOG3(("Http2Session::ProcessSlowConsumer Writesegments %p 0x%X rv %X %d\n",
        this, slowConsumer->StreamID(), rv, *countWritten));
  if (NS_SUCCEEDED(rv) && !*countWritten && slowConsumer->RecvdFin()) {
    rv = NS_BASE_STREAM_CLOSED;
  }

  if (NS_SUCCEEDED(rv) && (*countWritten > 0)) {
    // There have been buffered bytes successfully fed into the
    // formerly blocked consumer. Repeat until buffer empty or
    // consumer is blocked again.
    UpdateLocalRwin(slowConsumer, 0);
    ConnectSlowConsumer(slowConsumer);
  }

  if (rv == NS_BASE_STREAM_CLOSED) {
    CleanupStream(slowConsumer, NS_OK, CANCEL_ERROR);
    rv = NS_OK;
  }

  return rv;
}

void
Http2Session::UpdateLocalStreamWindow(Http2Stream *stream, uint32_t bytes)
{
  if (!stream) // this is ok - it means there was a data frame for a rst stream
    return;

  // If this data packet was not for a valid or live stream then there
  // is no reason to mess with the flow control
  if (!stream || stream->RecvdFin() || stream->RecvdReset() ||
      mInputFrameFinal) {
    return;
  }

  stream->DecrementClientReceiveWindow(bytes);

  // Don't necessarily ack every data packet. Only do it
  // after a significant amount of data.
  uint64_t unacked = stream->LocalUnAcked();
  int64_t  localWindow = stream->ClientReceiveWindow();

  LOG3(("Http2Session::UpdateLocalStreamWindow this=%p id=0x%X newbytes=%u "
        "unacked=%llu localWindow=%lld\n",
        this, stream->StreamID(), bytes, unacked, localWindow));

  if (!unacked)
    return;

  if ((unacked < kMinimumToAck) && (localWindow > kEmergencyWindowThreshold))
    return;

  if (!stream->HasSink()) {
    LOG3(("Http2Session::UpdateLocalStreamWindow %p 0x%X Pushed Stream Has No Sink\n",
          this, stream->StreamID()));
    return;
  }

  // Generate window updates directly out of session instead of the stream
  // in order to avoid queue delays in getting the 'ACK' out.
  uint32_t toack = (unacked <= 0x7fffffffU) ? unacked : 0x7fffffffU;

  LOG3(("Http2Session::UpdateLocalStreamWindow Ack this=%p id=0x%X acksize=%d\n",
        this, stream->StreamID(), toack));
  stream->IncrementClientReceiveWindow(toack);
  if (toack == 0) {
    // Ensure we never send an illegal 0 window update
    return;
  }

  // room for this packet needs to be ensured before calling this function
  char *packet = mOutputQueueBuffer.get() + mOutputQueueUsed;
  mOutputQueueUsed += kFrameHeaderBytes + 4;
  MOZ_ASSERT(mOutputQueueUsed <= mOutputQueueSize);

  CreateFrameHeader(packet, 4, FRAME_TYPE_WINDOW_UPDATE, 0, stream->StreamID());
  NetworkEndian::writeUint32(packet + kFrameHeaderBytes, toack);

  LogIO(this, stream, "Stream Window Update", packet, kFrameHeaderBytes + 4);
  // dont flush here, this write can commonly be coalesced with a
  // session window update to immediately follow.
}

void
Http2Session::UpdateLocalSessionWindow(uint32_t bytes)
{
  if (!bytes)
    return;

  mLocalSessionWindow -= bytes;

  LOG3(("Http2Session::UpdateLocalSessionWindow this=%p newbytes=%u "
        "localWindow=%lld\n", this, bytes, mLocalSessionWindow));

  // Don't necessarily ack every data packet. Only do it
  // after a significant amount of data.
  if ((mLocalSessionWindow > (mInitialRwin - kMinimumToAck)) &&
      (mLocalSessionWindow > kEmergencyWindowThreshold))
    return;

  // Only send max  bits of window updates at a time.
  uint64_t toack64 = mInitialRwin - mLocalSessionWindow;
  uint32_t toack = (toack64 <= 0x7fffffffU) ? toack64 : 0x7fffffffU;

  LOG3(("Http2Session::UpdateLocalSessionWindow Ack this=%p acksize=%u\n",
        this, toack));
  mLocalSessionWindow += toack;

  if (toack == 0) {
    // Ensure we never send an illegal 0 window update
    return;
  }

  // room for this packet needs to be ensured before calling this function
  char *packet = mOutputQueueBuffer.get() + mOutputQueueUsed;
  mOutputQueueUsed += kFrameHeaderBytes + 4;
  MOZ_ASSERT(mOutputQueueUsed <= mOutputQueueSize);

  CreateFrameHeader(packet, 4, FRAME_TYPE_WINDOW_UPDATE, 0, 0);
  NetworkEndian::writeUint32(packet + kFrameHeaderBytes, toack);

  LogIO(this, nullptr, "Session Window Update", packet, kFrameHeaderBytes + 4);
  // dont flush here, this write can commonly be coalesced with others
}

void
Http2Session::UpdateLocalRwin(Http2Stream *stream, uint32_t bytes)
{
  // make sure there is room for 2 window updates even though
  // we may not generate any.
  EnsureOutputBuffer(2 * (kFrameHeaderBytes + 4));

  UpdateLocalStreamWindow(stream, bytes);
  UpdateLocalSessionWindow(bytes);
  FlushOutputQueue();
}

void
Http2Session::Close(nsresult aReason)
{
  MOZ_ASSERT(PR_GetCurrentThread() == gSocketThread);

  if (mClosed)
    return;

  LOG3(("Http2Session::Close %p %X", this, aReason));

  mClosed = true;

  Shutdown();

  mStreamIDHash.Clear();
  mStreamTransactionHash.Clear();

  uint32_t goAwayReason;
  if (mGoAwayReason != NO_HTTP_ERROR) {
    goAwayReason = mGoAwayReason;
  } else if (NS_SUCCEEDED(aReason)) {
    goAwayReason = NO_HTTP_ERROR;
  } else if (aReason == NS_ERROR_ILLEGAL_VALUE) {
    goAwayReason = PROTOCOL_ERROR;
  } else {
    goAwayReason = INTERNAL_ERROR;
  }
  if (!mAttemptingEarlyData) {
    GenerateGoAway(goAwayReason);
  }
  mConnection = nullptr;
  mSegmentReader = nullptr;
  mSegmentWriter = nullptr;
}

nsHttpConnectionInfo *
Http2Session::ConnectionInfo()
{
  RefPtr<nsHttpConnectionInfo> ci;
  GetConnectionInfo(getter_AddRefs(ci));
  return ci.get();
}

void
Http2Session::CloseTransaction(nsAHttpTransaction *aTransaction,
                               nsresult aResult)
{
  MOZ_ASSERT(PR_GetCurrentThread() == gSocketThread);
  LOG3(("Http2Session::CloseTransaction %p %p %x", this, aTransaction, aResult));

  // Generally this arrives as a cancel event from the connection manager.

  // need to find the stream and call CleanupStream() on it.
  Http2Stream *stream = mStreamTransactionHash.Get(aTransaction);
  if (!stream) {
    LOG3(("Http2Session::CloseTransaction %p %p %x - not found.",
          this, aTransaction, aResult));
    return;
  }
  LOG3(("Http2Session::CloseTransaction probably a cancel. "
        "this=%p, trans=%p, result=%x, streamID=0x%X stream=%p",
        this, aTransaction, aResult, stream->StreamID(), stream));
  CleanupStream(stream, aResult, CANCEL_ERROR);
  ResumeRecv();
}

//-----------------------------------------------------------------------------
// nsAHttpSegmentReader
//-----------------------------------------------------------------------------

nsresult
Http2Session::OnReadSegment(const char *buf,
                            uint32_t count, uint32_t *countRead)
{
  MOZ_ASSERT(PR_GetCurrentThread() == gSocketThread);
  nsresult rv;

  // If we can release old queued data then we can try and write the new
  // data directly to the network without using the output queue at all
  if (mOutputQueueUsed && !mAttemptingEarlyData)
    FlushOutputQueue();

  if (!mOutputQueueUsed && mSegmentReader) {
    // try and write directly without output queue
    rv = mSegmentReader->OnReadSegment(buf, count, countRead);

    if (rv == NS_BASE_STREAM_WOULD_BLOCK) {
      *countRead = 0;
    } else if (NS_FAILED(rv)) {
      return rv;
    }

    if (*countRead < count) {
      uint32_t required = count - *countRead;
      // assuming a commitment() happened, this ensurebuffer is a nop
      // but just in case the queuesize is too small for the required data
      // call ensurebuffer().
      EnsureBuffer(mOutputQueueBuffer, required, 0, mOutputQueueSize);
      memcpy(mOutputQueueBuffer.get(), buf + *countRead, required);
      mOutputQueueUsed = required;
    }

    *countRead = count;
    return NS_OK;
  }

  // At this point we are going to buffer the new data in the output
  // queue if it fits. By coalescing multiple small submissions into one larger
  // buffer we can get larger writes out to the network later on.

  // This routine should not be allowed to fill up the output queue
  // all on its own - at least kQueueReserved bytes are always left
  // for other routines to use - but this is an all-or-nothing function,
  // so if it will not all fit just return WOULD_BLOCK

  if ((mOutputQueueUsed + count) > (mOutputQueueSize - kQueueReserved))
    return NS_BASE_STREAM_WOULD_BLOCK;

  memcpy(mOutputQueueBuffer.get() + mOutputQueueUsed, buf, count);
  mOutputQueueUsed += count;
  *countRead = count;

  FlushOutputQueue();

  return NS_OK;
}

nsresult
Http2Session::CommitToSegmentSize(uint32_t count, bool forceCommitment)
{
  if (mOutputQueueUsed)
    FlushOutputQueue();

  // would there be enough room to buffer this if needed?
  if ((mOutputQueueUsed + count) <= (mOutputQueueSize - kQueueReserved))
    return NS_OK;

  // if we are using part of our buffers already, try again later unless
  // forceCommitment is set.
  if (mOutputQueueUsed && !forceCommitment)
    return NS_BASE_STREAM_WOULD_BLOCK;

  if (mOutputQueueUsed) {
    // normally we avoid the memmove of RealignOutputQueue, but we'll try
    // it if forceCommitment is set before growing the buffer.
    RealignOutputQueue();

    // is there enough room now?
    if ((mOutputQueueUsed + count) <= (mOutputQueueSize - kQueueReserved))
      return NS_OK;
  }

  // resize the buffers as needed
  EnsureOutputBuffer(count + kQueueReserved);

  MOZ_ASSERT((mOutputQueueUsed + count) <= (mOutputQueueSize - kQueueReserved),
             "buffer not as large as expected");

  return NS_OK;
}

//-----------------------------------------------------------------------------
// nsAHttpSegmentWriter
//-----------------------------------------------------------------------------

nsresult
Http2Session::OnWriteSegment(char *buf,
                             uint32_t count, uint32_t *countWritten)
{
  MOZ_ASSERT(PR_GetCurrentThread() == gSocketThread);
  nsresult rv;

  if (!mSegmentWriter) {
    // the only way this could happen would be if Close() were called on the
    // stack with WriteSegments()
    return NS_ERROR_FAILURE;
  }

  if (mDownstreamState == NOT_USING_NETWORK ||
      mDownstreamState == BUFFERING_FRAME_HEADER ||
      mDownstreamState == DISCARDING_DATA_FRAME_PADDING) {
    return NS_BASE_STREAM_WOULD_BLOCK;
  }

  if (mDownstreamState == PROCESSING_DATA_FRAME) {

    if (mInputFrameFinal &&
        mInputFrameDataRead == mInputFrameDataSize) {
      *countWritten = 0;
      SetNeedsCleanup();
      return NS_BASE_STREAM_CLOSED;
    }

    count = std::min(count, mInputFrameDataSize - mInputFrameDataRead);
    rv = NetworkRead(mSegmentWriter, buf, count, countWritten);
    if (NS_FAILED(rv))
      return rv;

    LogIO(this, mInputFrameDataStream, "Reading Data Frame",
          buf, *countWritten);

    mInputFrameDataRead += *countWritten;
    if (mPaddingLength && (mInputFrameDataSize - mInputFrameDataRead <= mPaddingLength)) {
      // We are crossing from real HTTP data into the realm of padding. If
      // we've actually crossed the line, we need to munge countWritten for the
      // sake of goodness and sanity. No matter what, any future calls to
      // WriteSegments need to just discard data until we reach the end of this
      // frame.
      if (mInputFrameDataSize != mInputFrameDataRead) {
        // Only change state if we still have padding to read. If we don't do
        // this, we can end up hanging on frames that combine real data,
        // padding, and END_STREAM (see bug 1019921)
        ChangeDownstreamState(DISCARDING_DATA_FRAME_PADDING);
      }
      uint32_t paddingRead = mPaddingLength - (mInputFrameDataSize - mInputFrameDataRead);
      LOG3(("Http2Session::OnWriteSegment %p stream 0x%X len=%d read=%d "
            "crossed from HTTP data into padding (%d of %d) countWritten=%d",
            this, mInputFrameID, mInputFrameDataSize, mInputFrameDataRead,
            paddingRead, mPaddingLength, *countWritten));
      *countWritten -= paddingRead;
      LOG3(("Http2Session::OnWriteSegment %p stream 0x%X new countWritten=%d",
            this, mInputFrameID, *countWritten));
    }

    mInputFrameDataStream->UpdateTransportReadEvents(*countWritten);
    if ((mInputFrameDataRead == mInputFrameDataSize) && !mInputFrameFinal)
      ResetDownstreamState();

    return rv;
  }

  if (mDownstreamState == PROCESSING_COMPLETE_HEADERS) {

    if (mFlatHTTPResponseHeaders.Length() == mFlatHTTPResponseHeadersOut &&
        mInputFrameFinal) {
      *countWritten = 0;
      SetNeedsCleanup();
      return NS_BASE_STREAM_CLOSED;
    }

    count = std::min(count,
                     mFlatHTTPResponseHeaders.Length() -
                     mFlatHTTPResponseHeadersOut);
    memcpy(buf,
           mFlatHTTPResponseHeaders.get() + mFlatHTTPResponseHeadersOut,
           count);
    mFlatHTTPResponseHeadersOut += count;
    *countWritten = count;

    if (mFlatHTTPResponseHeaders.Length() == mFlatHTTPResponseHeadersOut) {
      if (!mInputFrameFinal) {
        // If more frames are expected in this stream, then reset the state so they can be
        // handled. Otherwise (e.g. a 0 length response with the fin on the incoming headers)
        // stay in PROCESSING_COMPLETE_HEADERS state so the SetNeedsCleanup() code above can
        // cleanup the stream.
        ResetDownstreamState();
      }
    }

    return NS_OK;
  }

  MOZ_ASSERT(false);
  return NS_ERROR_UNEXPECTED;
}

void
Http2Session::SetNeedsCleanup()
{
  LOG3(("Http2Session::SetNeedsCleanup %p - recorded downstream fin of "
        "stream %p 0x%X", this, mInputFrameDataStream,
        mInputFrameDataStream->StreamID()));

  // This will result in Close() being called
  MOZ_ASSERT(!mNeedsCleanup, "mNeedsCleanup unexpectedly set");
  mInputFrameDataStream->SetResponseIsComplete();
  mNeedsCleanup = mInputFrameDataStream;
  ResetDownstreamState();
}

void
Http2Session::ConnectPushedStream(Http2Stream *stream)
{
  mPushesReadyForRead.Push(stream);
  ForceRecv();
}

void
Http2Session::ConnectSlowConsumer(Http2Stream *stream)
{
  LOG3(("Http2Session::ConnectSlowConsumer %p 0x%X\n",
        this, stream->StreamID()));
  mSlowConsumersReadyForRead.Push(stream);
  ForceRecv();
}

uint32_t
Http2Session::FindTunnelCount(nsHttpConnectionInfo *aConnInfo)
{
  MOZ_ASSERT(PR_GetCurrentThread() == gSocketThread);
  uint32_t rv = 0;
  mTunnelHash.Get(aConnInfo->HashKey(), &rv);
  return rv;
}

void
Http2Session::RegisterTunnel(Http2Stream *aTunnel)
{
  MOZ_ASSERT(PR_GetCurrentThread() == gSocketThread);
  nsHttpConnectionInfo *ci = aTunnel->Transaction()->ConnectionInfo();
  uint32_t newcount = FindTunnelCount(ci) + 1;
  mTunnelHash.Remove(ci->HashKey());
  mTunnelHash.Put(ci->HashKey(), newcount);
  LOG3(("Http2Stream::RegisterTunnel %p stream=%p tunnels=%d [%s]",
        this, aTunnel, newcount, ci->HashKey().get()));
}

void
Http2Session::UnRegisterTunnel(Http2Stream *aTunnel)
{
  MOZ_ASSERT(PR_GetCurrentThread() == gSocketThread);
  nsHttpConnectionInfo *ci = aTunnel->Transaction()->ConnectionInfo();
  MOZ_ASSERT(FindTunnelCount(ci));
  uint32_t newcount = FindTunnelCount(ci) - 1;
  mTunnelHash.Remove(ci->HashKey());
  if (newcount) {
    mTunnelHash.Put(ci->HashKey(), newcount);
  }
  LOG3(("Http2Session::UnRegisterTunnel %p stream=%p tunnels=%d [%s]",
        this, aTunnel, newcount, ci->HashKey().get()));
}

void
Http2Session::CreateTunnel(nsHttpTransaction *trans,
                           nsHttpConnectionInfo *ci,
                           nsIInterfaceRequestor *aCallbacks)
{
  LOG(("Http2Session::CreateTunnel %p %p make new tunnel\n", this, trans));
  // The connect transaction will hold onto the underlying http
  // transaction so that an auth created by the connect can be mappped
  // to the correct security callbacks

  RefPtr<SpdyConnectTransaction> connectTrans =
    new SpdyConnectTransaction(ci, aCallbacks, trans->Caps(), trans, this);
  AddStream(connectTrans, nsISupportsPriority::PRIORITY_NORMAL, false, nullptr);
  Http2Stream *tunnel = mStreamTransactionHash.Get(connectTrans);
  MOZ_ASSERT(tunnel);
  RegisterTunnel(tunnel);
}

void
Http2Session::DispatchOnTunnel(nsAHttpTransaction *aHttpTransaction,
                               nsIInterfaceRequestor *aCallbacks)
{
  MOZ_ASSERT(PR_GetCurrentThread() == gSocketThread);
  nsHttpTransaction *trans = aHttpTransaction->QueryHttpTransaction();
  nsHttpConnectionInfo *ci = aHttpTransaction->ConnectionInfo();
  MOZ_ASSERT(trans);

  LOG3(("Http2Session::DispatchOnTunnel %p trans=%p", this, trans));

  aHttpTransaction->SetConnection(nullptr);

  // this transaction has done its work of setting up a tunnel, let
  // the connection manager queue it if necessary
  trans->SetTunnelProvider(this);
  trans->EnableKeepAlive();

  if (FindTunnelCount(ci) < gHttpHandler->MaxConnectionsPerOrigin()) {
    LOG3(("Http2Session::DispatchOnTunnel %p create on new tunnel %s",
          this, ci->HashKey().get()));
    CreateTunnel(trans, ci, aCallbacks);
  } else {
    // requeue it. The connection manager is responsible for actually putting
    // this on the tunnel connection with the specific ci. If that can't
    // happen the cmgr checks with us via MaybeReTunnel() to see if it should
    // make a new tunnel or just wait longer.
    LOG3(("Http2Session::DispatchOnTunnel %p trans=%p queue in connection manager",
          this, trans));
    gHttpHandler->InitiateTransaction(trans, trans->Priority());
  }
}

// From ASpdySession
bool
Http2Session::MaybeReTunnel(nsAHttpTransaction *aHttpTransaction)
{
  MOZ_ASSERT(PR_GetCurrentThread() == gSocketThread);
  nsHttpTransaction *trans = aHttpTransaction->QueryHttpTransaction();
  LOG(("Http2Session::MaybeReTunnel %p trans=%p\n", this, trans));
  if (!trans || trans->TunnelProvider() != this) {
    // this isn't really one of our transactions.
    return false;
  }

  if (mClosed || mShouldGoAway) {
    LOG(("Http2Session::MaybeReTunnel %p %p session closed - requeue\n", this, trans));
    trans->SetTunnelProvider(nullptr);
    gHttpHandler->InitiateTransaction(trans, trans->Priority());
    return true;
  }

  nsHttpConnectionInfo *ci = aHttpTransaction->ConnectionInfo();
  LOG(("Http2Session:MaybeReTunnel %p %p count=%d limit %d\n",
       this, trans, FindTunnelCount(ci), gHttpHandler->MaxConnectionsPerOrigin()));
  if (FindTunnelCount(ci) >= gHttpHandler->MaxConnectionsPerOrigin()) {
    // patience - a tunnel will open up.
    return false;
  }

  LOG(("Http2Session::MaybeReTunnel %p %p make new tunnel\n", this, trans));
  CreateTunnel(trans, ci, trans->SecurityCallbacks());
  return true;
}

nsresult
Http2Session::BufferOutput(const char *buf,
                           uint32_t count,
                           uint32_t *countRead)
{
  nsAHttpSegmentReader *old = mSegmentReader;
  mSegmentReader = nullptr;
  nsresult rv = OnReadSegment(buf, count, countRead);
  mSegmentReader = old;
  return rv;
}

bool // static
Http2Session::ALPNCallback(nsISupports *securityInfo)
{
  if (!gHttpHandler->IsH2MandatorySuiteEnabled()) {
    LOG3(("Http2Session::ALPNCallback Mandatory Cipher Suite Unavailable\n"));
    return false;
  }

  nsCOMPtr<nsISSLSocketControl> ssl = do_QueryInterface(securityInfo);
  LOG3(("Http2Session::ALPNCallback sslsocketcontrol=%p\n", ssl.get()));
  if (ssl) {
    int16_t version = ssl->GetSSLVersionOffered();
    LOG3(("Http2Session::ALPNCallback version=%x\n", version));
    if (version >= nsISSLSocketControl::TLS_VERSION_1_2) {
      return true;
    }
  }
  return false;
}

nsresult
Http2Session::ConfirmTLSProfile()
{
  if (mTLSProfileConfirmed) {
    return NS_OK;
  }

  LOG3(("Http2Session::ConfirmTLSProfile %p mConnection=%p\n",
        this, mConnection.get()));

  if (mAttemptingEarlyData) {
    LOG3(("Http2Session::ConfirmTLSProfile %p temporarily passing due to early data\n", this));
    return NS_OK;
  }

  if (!gHttpHandler->EnforceHttp2TlsProfile()) {
    LOG3(("Http2Session::ConfirmTLSProfile %p passed due to configuration bypass\n", this));
    mTLSProfileConfirmed = true;
    return NS_OK;
  }

  if (!mConnection)
    return NS_ERROR_FAILURE;

  nsCOMPtr<nsISupports> securityInfo;
  mConnection->GetSecurityInfo(getter_AddRefs(securityInfo));
  nsCOMPtr<nsISSLSocketControl> ssl = do_QueryInterface(securityInfo);
  LOG3(("Http2Session::ConfirmTLSProfile %p sslsocketcontrol=%p\n", this, ssl.get()));
  if (!ssl)
    return NS_ERROR_FAILURE;

  int16_t version = ssl->GetSSLVersionUsed();
  LOG3(("Http2Session::ConfirmTLSProfile %p version=%x\n", this, version));
  if (version < nsISSLSocketControl::TLS_VERSION_1_2) {
    LOG3(("Http2Session::ConfirmTLSProfile %p FAILED due to lack of TLS1.2\n", this));
    RETURN_SESSION_ERROR(this, INADEQUATE_SECURITY);
  }

  uint16_t kea = ssl->GetKEAUsed();
  if (kea != ssl_kea_dh && kea != ssl_kea_ecdh) {
    LOG3(("Http2Session::ConfirmTLSProfile %p FAILED due to invalid KEA %d\n",
          this, kea));
    RETURN_SESSION_ERROR(this, INADEQUATE_SECURITY);
  }

  uint32_t keybits = ssl->GetKEAKeyBits();
  if (kea == ssl_kea_dh && keybits < 2048) {
    LOG3(("Http2Session::ConfirmTLSProfile %p FAILED due to DH %d < 2048\n",
          this, keybits));
    RETURN_SESSION_ERROR(this, INADEQUATE_SECURITY);
  } else if (kea == ssl_kea_ecdh && keybits < 224) { // see rfc7540 9.2.1.
    LOG3(("Http2Session::ConfirmTLSProfile %p FAILED due to ECDH %d < 224\n",
          this, keybits));
    RETURN_SESSION_ERROR(this, INADEQUATE_SECURITY);
  }

  int16_t macAlgorithm = ssl->GetMACAlgorithmUsed();
  LOG3(("Http2Session::ConfirmTLSProfile %p MAC Algortihm (aead==6) %d\n",
        this, macAlgorithm));
  if (macAlgorithm != nsISSLSocketControl::SSL_MAC_AEAD) {
    LOG3(("Http2Session::ConfirmTLSProfile %p FAILED due to lack of AEAD\n", this));
    RETURN_SESSION_ERROR(this, INADEQUATE_SECURITY);
  }

  /* We are required to send SNI. We do that already, so no check is done
   * here to make sure we did. */

  /* We really should check to ensure TLS compression isn't enabled on
   * this connection. However, we never enable TLS compression on our end,
   * anyway, so it'll never be on. All the same, see https://bugzil.la/965881
   * for the possibility for an interface to ensure it never gets turned on. */

  mTLSProfileConfirmed = true;
  return NS_OK;
}


//-----------------------------------------------------------------------------
// Modified methods of nsAHttpConnection
//-----------------------------------------------------------------------------

void
Http2Session::TransactionHasDataToWrite(nsAHttpTransaction *caller)
{
  MOZ_ASSERT(PR_GetCurrentThread() == gSocketThread);
  LOG3(("Http2Session::TransactionHasDataToWrite %p trans=%p", this, caller));

  // a trapped signal from the http transaction to the connection that
  // it is no longer blocked on read.

  Http2Stream *stream = mStreamTransactionHash.Get(caller);
  if (!stream || !VerifyStream(stream)) {
    LOG3(("Http2Session::TransactionHasDataToWrite %p caller %p not found",
          this, caller));
    return;
  }

  LOG3(("Http2Session::TransactionHasDataToWrite %p ID is 0x%X\n",
        this, stream->StreamID()));

  if (!mClosed) {
    mReadyForWrite.Push(stream);
    SetWriteCallbacks();
  } else {
    LOG3(("Http2Session::TransactionHasDataToWrite %p closed so not setting Ready4Write\n",
          this));
  }

  // NSPR poll will not poll the network if there are non system PR_FileDesc's
  // that are ready - so we can get into a deadlock waiting for the system IO
  // to come back here if we don't force the send loop manually.
  ForceSend();
}

void
Http2Session::TransactionHasDataToRecv(nsAHttpTransaction *caller)
{
  MOZ_ASSERT(PR_GetCurrentThread() == gSocketThread);
  LOG3(("Http2Session::TransactionHasDataToRecv %p trans=%p", this, caller));

  // a signal from the http transaction to the connection that it will consume more
  Http2Stream *stream = mStreamTransactionHash.Get(caller);
  if (!stream || !VerifyStream(stream)) {
    LOG3(("Http2Session::TransactionHasDataToRecv %p caller %p not found",
          this, caller));
    return;
  }

  LOG3(("Http2Session::TransactionHasDataToRecv %p ID is 0x%X\n",
        this, stream->StreamID()));
  ConnectSlowConsumer(stream);
}

void
Http2Session::TransactionHasDataToWrite(Http2Stream *stream)
{
  MOZ_ASSERT(PR_GetCurrentThread() == gSocketThread);
  LOG3(("Http2Session::TransactionHasDataToWrite %p stream=%p ID=0x%x",
        this, stream, stream->StreamID()));

  mReadyForWrite.Push(stream);
  SetWriteCallbacks();
  ForceSend();
}

bool
Http2Session::IsPersistent()
{
  return true;
}

nsresult
Http2Session::TakeTransport(nsISocketTransport **,
                            nsIAsyncInputStream **, nsIAsyncOutputStream **)
{
  MOZ_ASSERT(false, "TakeTransport of Http2Session");
  return NS_ERROR_UNEXPECTED;
}

already_AddRefed<nsHttpConnection>
Http2Session::TakeHttpConnection()
{
  MOZ_ASSERT(false, "TakeHttpConnection of Http2Session");
  return nullptr;
}

uint32_t
Http2Session::CancelPipeline(nsresult reason)
{
  // we don't pipeline inside http/2, so this isn't an issue
  return 0;
}

nsAHttpTransaction::Classifier
Http2Session::Classification()
{
  if (!mConnection)
    return nsAHttpTransaction::CLASS_GENERAL;
  return mConnection->Classification();
}

void
Http2Session::GetSecurityCallbacks(nsIInterfaceRequestor **aOut)
{
  *aOut = nullptr;
}

//-----------------------------------------------------------------------------
// unused methods of nsAHttpTransaction
// We can be sure of this because Http2Session is only constructed in
// nsHttpConnection and is never passed out of that object or a TLSFilterTransaction
// TLS tunnel
//-----------------------------------------------------------------------------

void
Http2Session::SetConnection(nsAHttpConnection *)
{
  // This is unexpected
  MOZ_ASSERT(false, "Http2Session::SetConnection()");
}

void
Http2Session::SetProxyConnectFailed()
{
  MOZ_ASSERT(false, "Http2Session::SetProxyConnectFailed()");
}

bool
Http2Session::IsDone()
{
  return !mStreamTransactionHash.Count();
}

nsresult
Http2Session::Status()
{
  MOZ_ASSERT(false, "Http2Session::Status()");
  return NS_ERROR_UNEXPECTED;
}

uint32_t
Http2Session::Caps()
{
  MOZ_ASSERT(false, "Http2Session::Caps()");
  return 0;
}

void
Http2Session::SetDNSWasRefreshed()
{
  MOZ_ASSERT(false, "Http2Session::SetDNSWasRefreshed()");
}

uint64_t
Http2Session::Available()
{
  MOZ_ASSERT(false, "Http2Session::Available()");
  return 0;
}

nsHttpRequestHead *
Http2Session::RequestHead()
{
  MOZ_ASSERT(PR_GetCurrentThread() == gSocketThread);
  MOZ_ASSERT(false,
             "Http2Session::RequestHead() "
             "should not be called after http/2 is setup");
  return NULL;
}

uint32_t
Http2Session::Http1xTransactionCount()
{
  return 0;
}

nsresult
Http2Session::TakeSubTransactions(
  nsTArray<RefPtr<nsAHttpTransaction> > &outTransactions)
{
  // Generally this cannot be done with http/2 as transactions are
  // started right away.

  LOG3(("Http2Session::TakeSubTransactions %p\n", this));

  if (mConcurrentHighWater > 0)
    return NS_ERROR_ALREADY_OPENED;

  LOG3(("   taking %d\n", mStreamTransactionHash.Count()));

  for (auto iter = mStreamTransactionHash.Iter(); !iter.Done(); iter.Next()) {
    outTransactions.AppendElement(iter.Key());

    // Removing the stream from the hash will delete the stream and drop the
    // transaction reference the hash held.
    iter.Remove();
  }
  return NS_OK;
}

nsresult
Http2Session::AddTransaction(nsAHttpTransaction *)
{
  // This API is meant for pipelining, Http2Session's should be
  // extended with AddStream()

  MOZ_ASSERT(false,
             "Http2Session::AddTransaction() should not be called");

  return NS_ERROR_NOT_IMPLEMENTED;
}

uint32_t
Http2Session::PipelineDepth()
{
  return IsDone() ? 0 : 1;
}

nsresult
Http2Session::SetPipelinePosition(int32_t position)
{
  // This API is meant for pipelining, Http2Session's should be
  // extended with AddStream()

  MOZ_ASSERT(false,
             "Http2Session::SetPipelinePosition() should not be called");

  return NS_ERROR_NOT_IMPLEMENTED;
}

int32_t
Http2Session::PipelinePosition()
{
  return 0;
}

//-----------------------------------------------------------------------------
// Pass through methods of nsAHttpConnection
//-----------------------------------------------------------------------------

nsAHttpConnection *
Http2Session::Connection()
{
  MOZ_ASSERT(PR_GetCurrentThread() == gSocketThread);
  return mConnection;
}

nsresult
Http2Session::OnHeadersAvailable(nsAHttpTransaction *transaction,
                                 nsHttpRequestHead *requestHead,
                                 nsHttpResponseHead *responseHead, bool *reset)
{
  return mConnection->OnHeadersAvailable(transaction,
                                         requestHead,
                                         responseHead,
                                         reset);
}

bool
Http2Session::IsReused()
{
  return mConnection->IsReused();
}

nsresult
Http2Session::PushBack(const char *buf, uint32_t len)
{
  return mConnection->PushBack(buf, len);
}

void
Http2Session::SendPing()
{
  MOZ_ASSERT(PR_GetCurrentThread() == gSocketThread);

  if (mPreviousUsed) {
    // alredy in progress, get out
    return;
  }

  mPingSentEpoch = PR_IntervalNow();
  if (!mPingSentEpoch) {
    mPingSentEpoch = 1; // avoid the 0 sentinel value
  }
  if (!mPingThreshold ||
      (mPingThreshold > gHttpHandler->NetworkChangedTimeout())) {
    mPreviousPingThreshold = mPingThreshold;
    mPreviousUsed = true;
    mPingThreshold = gHttpHandler->NetworkChangedTimeout();
  }
  GeneratePing(false);
  ResumeRecv();
}

} // namespace net
} // namespace mozilla