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
|
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* 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/. */
#include "nsDNSPrefetch.h"
#include "nsCOMPtr.h"
#include "nsString.h"
#include "nsThreadUtils.h"
#include "nsIDNSListener.h"
#include "nsIDNSService.h"
#include "nsICancelable.h"
#include "nsIURI.h"
static nsIDNSService *sDNSService = nullptr;
nsresult
nsDNSPrefetch::Initialize(nsIDNSService *aDNSService)
{
NS_IF_RELEASE(sDNSService);
sDNSService = aDNSService;
NS_IF_ADDREF(sDNSService);
return NS_OK;
}
nsresult
nsDNSPrefetch::Shutdown()
{
NS_IF_RELEASE(sDNSService);
return NS_OK;
}
nsDNSPrefetch::nsDNSPrefetch(nsIURI *aURI,
nsIDNSListener *aListener,
bool storeTiming)
: mStoreTiming(storeTiming)
, mListener(do_GetWeakReference(aListener))
{
aURI->GetAsciiHost(mHostname);
}
nsresult
nsDNSPrefetch::Prefetch(uint16_t flags)
{
if (mHostname.IsEmpty())
return NS_ERROR_NOT_AVAILABLE;
if (!sDNSService)
return NS_ERROR_NOT_AVAILABLE;
nsCOMPtr<nsICancelable> tmpOutstanding;
if (mStoreTiming)
mStartTimestamp = mozilla::TimeStamp::Now();
// If AsyncResolve fails, for example because prefetching is disabled,
// then our timing will be useless. However, in such a case,
// mEndTimestamp will be a null timestamp and callers should check
// TimingsValid() before using the timing.
nsCOMPtr<nsIThread> mainThread = do_GetMainThread();
return sDNSService->AsyncResolve(mHostname,
flags | nsIDNSService::RESOLVE_SPECULATE,
this, mainThread,
getter_AddRefs(tmpOutstanding));
}
nsresult
nsDNSPrefetch::PrefetchLow(bool refreshDNS)
{
return Prefetch(nsIDNSService::RESOLVE_PRIORITY_LOW |
(refreshDNS ? nsIDNSService::RESOLVE_BYPASS_CACHE : 0));
}
nsresult
nsDNSPrefetch::PrefetchMedium(bool refreshDNS)
{
return Prefetch(nsIDNSService::RESOLVE_PRIORITY_MEDIUM |
(refreshDNS ? nsIDNSService::RESOLVE_BYPASS_CACHE : 0));
}
nsresult
nsDNSPrefetch::PrefetchHigh(bool refreshDNS)
{
return Prefetch(refreshDNS ?
nsIDNSService::RESOLVE_BYPASS_CACHE : 0);
}
NS_IMPL_ISUPPORTS(nsDNSPrefetch, nsIDNSListener)
NS_IMETHODIMP
nsDNSPrefetch::OnLookupComplete(nsICancelable *request,
nsIDNSRecord *rec,
nsresult status)
{
MOZ_ASSERT(NS_IsMainThread(), "Expecting DNS callback on main thread.");
if (mStoreTiming) {
mEndTimestamp = mozilla::TimeStamp::Now();
}
nsCOMPtr<nsIDNSListener> listener = do_QueryReferent(mListener);
if (listener) {
listener->OnLookupComplete(request, rec, status);
}
return NS_OK;
}
|
