Add m-esr52 at 52.6.0

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diff --git a/testing/xpcshell/node-http2/lib/protocol/connection.js b/testing/xpcshell/node-http2/lib/protocol/connection.js
new file mode 100644
index 000000000..2b86b7f1c
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+++ b/testing/xpcshell/node-http2/lib/protocol/connection.js
@@ -0,0 +1,619 @@
+var assert = require('assert');
+
+// The Connection class
+// ====================
+
+// The Connection class manages HTTP/2 connections. Each instance corresponds to one transport
+// stream (TCP stream). It operates by sending and receiving frames and is implemented as a
+// [Flow](flow.html) subclass.
+
+var Flow = require('./flow').Flow;
+
+exports.Connection = Connection;
+
+// Public API
+// ----------
+
+// * **new Connection(log, firstStreamId, settings)**: create a new Connection
+//
+// * **Event: 'error' (type)**: signals a connection level error made by the other end
+//
+// * **Event: 'peerError' (type)**: signals the receipt of a GOAWAY frame that contains an error
+//   code other than NO_ERROR
+//
+// * **Event: 'stream' (stream)**: signals that there's an incoming stream
+//
+// * **createStream(): stream**: initiate a new stream
+//
+// * **set(settings, callback)**: change the value of one or more settings according to the
+//   key-value pairs of `settings`. The callback is called after the peer acknowledged the changes.
+//
+// * **ping([callback])**: send a ping and call callback when the answer arrives
+//
+// * **close([error])**: close the stream with an error code
+
+// Constructor
+// -----------
+
+// The main aspects of managing the connection are:
+function Connection(log, firstStreamId, settings) {
+  // * initializing the base class
+  Flow.call(this, 0);
+
+  // * logging: every method uses the common logger object
+  this._log = log.child({ component: 'connection' });
+
+  // * stream management
+  this._initializeStreamManagement(firstStreamId);
+
+  // * lifecycle management
+  this._initializeLifecycleManagement();
+
+  // * flow control
+  this._initializeFlowControl();
+
+  // * settings management
+  this._initializeSettingsManagement(settings);
+
+  // * multiplexing
+  this._initializeMultiplexing();
+}
+Connection.prototype = Object.create(Flow.prototype, { constructor: { value: Connection } });
+
+// Overview
+// --------
+
+//              |    ^             |    ^
+//              v    |             v    |
+//         +--------------+   +--------------+
+//     +---|   stream1    |---|   stream2    |----      ....      ---+
+//     |   | +----------+ |   | +----------+ |                       |
+//     |   | | stream1. | |   | | stream2. | |                       |
+//     |   +-| upstream |-+   +-| upstream |-+                       |
+//     |     +----------+       +----------+                         |
+//     |       |     ^             |     ^                           |
+//     |       v     |             v     |                           |
+//     |       +-----+-------------+-----+--------      ....         |
+//     |       ^     |             |     |                           |
+//     |       |     v             |     |                           |
+//     |   +--------------+        |     |                           |
+//     |   |   stream0    |        |     |                           |
+//     |   |  connection  |        |     |                           |
+//     |   |  management  |     multiplexing                         |
+//     |   +--------------+     flow control                         |
+//     |                           |     ^                           |
+//     |                   _read() |     | _write()                  |
+//     |                           v     |                           |
+//     |                +------------+ +-----------+                 |
+//     |                |output queue| |input queue|                 |
+//     +----------------+------------+-+-----------+-----------------+
+//                                 |     ^
+//                          read() |     | write()
+//                                 v     |
+
+// Stream management
+// -----------------
+
+var Stream  = require('./stream').Stream;
+
+// Initialization:
+Connection.prototype._initializeStreamManagement = function _initializeStreamManagement(firstStreamId) {
+  // * streams are stored in two data structures:
+  //   * `_streamIds` is an id -> stream map of the streams that are allowed to receive frames.
+  //   * `_streamPriorities` is a priority -> [stream] map of stream that allowed to send frames.
+  this._streamIds = [];
+  this._streamPriorities = [];
+
+  // * The next outbound stream ID and the last inbound stream id
+  this._nextStreamId = firstStreamId;
+  this._lastIncomingStream = 0;
+
+  // * Calling `_writeControlFrame` when there's an incoming stream with 0 as stream ID
+  this._streamIds[0] = { upstream: { write: this._writeControlFrame.bind(this) } };
+
+  // * By default, the number of concurrent outbound streams is not limited. The `_streamLimit` can
+  //   be set by the SETTINGS_MAX_CONCURRENT_STREAMS setting.
+  this._streamSlotsFree = Infinity;
+  this._streamLimit = Infinity;
+  this.on('RECEIVING_SETTINGS_MAX_CONCURRENT_STREAMS', this._updateStreamLimit);
+};
+
+// `_writeControlFrame` is called when there's an incoming frame in the `_control` stream. It
+// broadcasts the message by creating an event on it.
+Connection.prototype._writeControlFrame = function _writeControlFrame(frame) {
+  if ((frame.type === 'SETTINGS') || (frame.type === 'PING') ||
+      (frame.type === 'GOAWAY') || (frame.type === 'WINDOW_UPDATE') ||
+      (frame.type === 'ALTSVC')) {
+    this._log.debug({ frame: frame }, 'Receiving connection level frame');
+    this.emit(frame.type, frame);
+  } else {
+    this._log.error({ frame: frame }, 'Invalid connection level frame');
+    this.emit('error', 'PROTOCOL_ERROR');
+  }
+};
+
+// Methods to manage the stream slot pool:
+Connection.prototype._updateStreamLimit = function _updateStreamLimit(newStreamLimit) {
+  var wakeup = (this._streamSlotsFree === 0) && (newStreamLimit > this._streamLimit);
+  this._streamSlotsFree += newStreamLimit - this._streamLimit;
+  this._streamLimit = newStreamLimit;
+  if (wakeup) {
+    this.emit('wakeup');
+  }
+};
+
+Connection.prototype._changeStreamCount = function _changeStreamCount(change) {
+  if (change) {
+    this._log.trace({ free: this._streamSlotsFree, change: change },
+                    'Changing active stream count.');
+    var wakeup = (this._streamSlotsFree === 0) && (change < 0);
+    this._streamSlotsFree -= change;
+    if (wakeup) {
+      this.emit('wakeup');
+    }
+  }
+};
+
+// Creating a new *inbound or outbound* stream with the given `id` (which is undefined in case of
+// an outbound stream) consists of three steps:
+//
+// 1. var stream = new Stream(this._log, this);
+// 2. this._allocateId(stream, id);
+// 2. this._allocatePriority(stream);
+
+// Allocating an ID to a stream
+Connection.prototype._allocateId = function _allocateId(stream, id) {
+  // * initiated stream without definite ID
+  if (id === undefined) {
+    id = this._nextStreamId;
+    this._nextStreamId += 2;
+  }
+
+  // * incoming stream with a legitim ID (larger than any previous and different parity than ours)
+  else if ((id > this._lastIncomingStream) && ((id - this._nextStreamId) % 2 !== 0)) {
+    this._lastIncomingStream = id;
+  }
+
+  // * incoming stream with invalid ID
+  else {
+    this._log.error({ stream_id: id, lastIncomingStream: this._lastIncomingStream },
+                    'Invalid incoming stream ID.');
+    this.emit('error', 'PROTOCOL_ERROR');
+    return undefined;
+  }
+
+  assert(!(id in this._streamIds));
+
+  // * adding to `this._streamIds`
+  this._log.trace({ s: stream, stream_id: id }, 'Allocating ID for stream.');
+  this._streamIds[id] = stream;
+  stream.id = id;
+  this.emit('new_stream', stream, id);
+
+  // * forwarding connection errors from streams
+  stream.on('connectionError', this.emit.bind(this, 'error'));
+
+  return id;
+};
+
+// Allocating a priority to a stream, and managing priority changes
+Connection.prototype._allocatePriority = function _allocatePriority(stream) {
+  this._log.trace({ s: stream }, 'Allocating priority for stream.');
+  this._insert(stream, stream._priority);
+  stream.on('priority', this._reprioritize.bind(this, stream));
+  stream.upstream.on('readable', this.emit.bind(this, 'wakeup'));
+  this.emit('wakeup');
+};
+
+Connection.prototype._insert = function _insert(stream, priority) {
+  if (priority in this._streamPriorities) {
+    this._streamPriorities[priority].push(stream);
+  } else {
+    this._streamPriorities[priority] = [stream];
+  }
+};
+
+Connection.prototype._reprioritize = function _reprioritize(stream, priority) {
+  var bucket = this._streamPriorities[stream._priority];
+  var index = bucket.indexOf(stream);
+  assert(index !== -1);
+  bucket.splice(index, 1);
+  if (bucket.length === 0) {
+    delete this._streamPriorities[stream._priority];
+  }
+
+  this._insert(stream, priority);
+};
+
+// Creating an *inbound* stream with the given ID. It is called when there's an incoming frame to
+// a previously nonexistent stream.
+Connection.prototype._createIncomingStream = function _createIncomingStream(id) {
+  this._log.debug({ stream_id: id }, 'New incoming stream.');
+
+  var stream = new Stream(this._log, this);
+  this._allocateId(stream, id);
+  this._allocatePriority(stream);
+  this.emit('stream', stream, id);
+
+  return stream;
+};
+
+// Creating an *outbound* stream
+Connection.prototype.createStream = function createStream() {
+  this._log.trace('Creating new outbound stream.');
+
+  // * Receiving is enabled immediately, and an ID gets assigned to the stream
+  var stream = new Stream(this._log, this);
+  this._allocatePriority(stream);
+
+  return stream;
+};
+
+// Multiplexing
+// ------------
+
+Connection.prototype._initializeMultiplexing = function _initializeMultiplexing() {
+  this.on('window_update', this.emit.bind(this, 'wakeup'));
+  this._sendScheduled = false;
+  this._firstFrameReceived = false;
+};
+
+// The `_send` method is a virtual method of the [Flow class](flow.html) that has to be implemented
+// by child classes. It reads frames from streams and pushes them to the output buffer.
+Connection.prototype._send = function _send(immediate) {
+  // * Do not do anything if the connection is already closed
+  if (this._closed) {
+    return;
+  }
+
+  // * Collapsing multiple calls in a turn into a single deferred call
+  if (immediate) {
+    this._sendScheduled = false;
+  } else {
+    if (!this._sendScheduled) {
+      this._sendScheduled = true;
+      setImmediate(this._send.bind(this, true));
+    }
+    return;
+  }
+
+  this._log.trace('Starting forwarding frames from streams.');
+
+  // * Looping through priority `bucket`s in priority order.
+priority_loop:
+  for (var priority in this._streamPriorities) {
+    var bucket = this._streamPriorities[priority];
+    var nextBucket = [];
+
+    // * Forwarding frames from buckets with round-robin scheduling.
+    //   1. pulling out frame
+    //   2. if there's no frame, skip this stream
+    //   3. if forwarding this frame would make `streamCount` greater than `streamLimit`, skip
+    //      this stream
+    //   4. adding stream to the bucket of the next round
+    //   5. assigning an ID to the frame (allocating an ID to the stream if there isn't already)
+    //   6. if forwarding a PUSH_PROMISE, allocate ID to the promised stream
+    //   7. forwarding the frame, changing `streamCount` as appropriate
+    //   8. stepping to the next stream if there's still more frame needed in the output buffer
+    //   9. switching to the bucket of the next round
+    while (bucket.length > 0) {
+      for (var index = 0; index < bucket.length; index++) {
+        var stream = bucket[index];
+        var frame = stream.upstream.read((this._window > 0) ? this._window : -1);
+
+        if (!frame) {
+          continue;
+        } else if (frame.count_change > this._streamSlotsFree) {
+          stream.upstream.unshift(frame);
+          continue;
+        }
+
+        nextBucket.push(stream);
+
+        if (frame.stream === undefined) {
+          frame.stream = stream.id || this._allocateId(stream);
+        }
+
+        if (frame.type === 'PUSH_PROMISE') {
+          this._allocatePriority(frame.promised_stream);
+          frame.promised_stream = this._allocateId(frame.promised_stream);
+        }
+
+        this._log.trace({ s: stream, frame: frame }, 'Forwarding outgoing frame');
+        var moreNeeded = this.push(frame);
+        this._changeStreamCount(frame.count_change);
+
+        assert(moreNeeded !== null); // The frame shouldn't be unforwarded
+        if (moreNeeded === false) {
+          break priority_loop;
+        }
+      }
+
+      bucket = nextBucket;
+      nextBucket = [];
+    }
+  }
+
+  // * if we couldn't forward any frame, then sleep until window update, or some other wakeup event
+  if (moreNeeded === undefined) {
+    this.once('wakeup', this._send.bind(this));
+  }
+
+  this._log.trace({ moreNeeded: moreNeeded }, 'Stopping forwarding frames from streams.');
+};
+
+// The `_receive` method is another virtual method of the [Flow class](flow.html) that has to be
+// implemented by child classes. It forwards the given frame to the appropriate stream:
+Connection.prototype._receive = function _receive(frame, done) {
+  this._log.trace({ frame: frame }, 'Forwarding incoming frame');
+
+  // * first frame needs to be checked by the `_onFirstFrameReceived` method
+  if (!this._firstFrameReceived) {
+    this._firstFrameReceived = true;
+    this._onFirstFrameReceived(frame);
+  }
+
+  // Do some sanity checking here before we create a stream
+  if ((frame.type == 'SETTINGS' ||
+       frame.type == 'PING' ||
+       frame.type == 'GOAWAY') &&
+      frame.stream != 0) {
+    // Got connection-level frame on a stream - EEP!
+    this.close('PROTOCOL_ERROR');
+    return;
+  } else if ((frame.type == 'DATA' ||
+              frame.type == 'HEADERS' ||
+              frame.type == 'PRIORITY' ||
+              frame.type == 'RST_STREAM' ||
+              frame.type == 'PUSH_PROMISE' ||
+              frame.type == 'CONTINUATION') &&
+             frame.stream == 0) {
+    // Got stream-level frame on connection - EEP!
+    this.close('PROTOCOL_ERROR');
+    return;
+  }
+  // WINDOW_UPDATE can be on either stream or connection
+
+  // * gets the appropriate stream from the stream registry
+  var stream = this._streamIds[frame.stream];
+
+  // * or creates one if it's not in `this.streams`
+  if (!stream) {
+    stream = this._createIncomingStream(frame.stream);
+  }
+
+  // * in case of PUSH_PROMISE, replaces the promised stream id with a new incoming stream
+  if (frame.type === 'PUSH_PROMISE') {
+    frame.promised_stream = this._createIncomingStream(frame.promised_stream);
+  }
+
+  frame.count_change = this._changeStreamCount.bind(this);
+
+  // * and writes it to the `stream`'s `upstream`
+  stream.upstream.write(frame);
+
+  done();
+};
+
+// Settings management
+// -------------------
+
+var defaultSettings = {
+};
+
+// Settings management initialization:
+Connection.prototype._initializeSettingsManagement = function _initializeSettingsManagement(settings) {
+  // * Setting up the callback queue for setting acknowledgements
+  this._settingsAckCallbacks = [];
+
+  // * Sending the initial settings.
+  this._log.debug({ settings: settings },
+                  'Sending the first SETTINGS frame as part of the connection header.');
+  this.set(settings || defaultSettings);
+
+  // * Forwarding SETTINGS frames to the `_receiveSettings` method
+  this.on('SETTINGS', this._receiveSettings);
+  this.on('RECEIVING_SETTINGS_MAX_FRAME_SIZE', this._sanityCheckMaxFrameSize);
+};
+
+// * Checking that the first frame the other endpoint sends is SETTINGS
+Connection.prototype._onFirstFrameReceived = function _onFirstFrameReceived(frame) {
+  if ((frame.stream === 0) && (frame.type === 'SETTINGS')) {
+    this._log.debug('Receiving the first SETTINGS frame as part of the connection header.');
+  } else {
+    this._log.fatal({ frame: frame }, 'Invalid connection header: first frame is not SETTINGS.');
+    this.emit('error', 'PROTOCOL_ERROR');
+  }
+};
+
+// Handling of incoming SETTINGS frames.
+Connection.prototype._receiveSettings = function _receiveSettings(frame) {
+  // * If it's an ACK, call the appropriate callback
+  if (frame.flags.ACK) {
+    var callback = this._settingsAckCallbacks.shift();
+    if (callback) {
+      callback();
+    }
+  }
+
+  // * If it's a setting change request, then send an ACK and change the appropriate settings
+  else {
+    if (!this._closed) {
+      this.push({
+        type: 'SETTINGS',
+        flags: { ACK: true },
+        stream: 0,
+        settings: {}
+      });
+    }
+    for (var name in frame.settings) {
+      this.emit('RECEIVING_' + name, frame.settings[name]);
+    }
+  }
+};
+
+Connection.prototype._sanityCheckMaxFrameSize = function _sanityCheckMaxFrameSize(value) {
+  if ((value < 0x4000) || (value >= 0x01000000)) {
+    this._log.fatal('Received invalid value for max frame size: ' + value);
+    this.emit('error');
+  }
+};
+
+// Changing one or more settings value and sending out a SETTINGS frame
+Connection.prototype.set = function set(settings, callback) {
+  // * Calling the callback and emitting event when the change is acknowledges
+  var self = this;
+  this._settingsAckCallbacks.push(function() {
+    for (var name in settings) {
+      self.emit('ACKNOWLEDGED_' + name, settings[name]);
+    }
+    if (callback) {
+      callback();
+    }
+  });
+
+  // * Sending out the SETTINGS frame
+  this.push({
+    type: 'SETTINGS',
+    flags: { ACK: false },
+    stream: 0,
+    settings: settings
+  });
+  for (var name in settings) {
+    this.emit('SENDING_' + name, settings[name]);
+  }
+};
+
+// Lifecycle management
+// --------------------
+
+// The main responsibilities of lifecycle management code:
+//
+// * keeping the connection alive by
+//   * sending PINGs when the connection is idle
+//   * answering PINGs
+// * ending the connection
+
+Connection.prototype._initializeLifecycleManagement = function _initializeLifecycleManagement() {
+  this._pings = {};
+  this.on('PING', this._receivePing);
+  this.on('GOAWAY', this._receiveGoaway);
+  this._closed = false;
+};
+
+// Generating a string of length 16 with random hexadecimal digits
+Connection.prototype._generatePingId = function _generatePingId() {
+  do {
+    var id = '';
+    for (var i = 0; i < 16; i++) {
+      id += Math.floor(Math.random()*16).toString(16);
+    }
+  } while(id in this._pings);
+  return id;
+};
+
+// Sending a ping and calling `callback` when the answer arrives
+Connection.prototype.ping = function ping(callback) {
+  var id = this._generatePingId();
+  var data = new Buffer(id, 'hex');
+  this._pings[id] = callback;
+
+  this._log.debug({ data: data }, 'Sending PING.');
+  this.push({
+    type: 'PING',
+    flags: {
+      ACK: false
+    },
+    stream: 0,
+    data: data
+  });
+};
+
+// Answering pings
+Connection.prototype._receivePing = function _receivePing(frame) {
+  if (frame.flags.ACK) {
+    var id = frame.data.toString('hex');
+    if (id in this._pings) {
+      this._log.debug({ data: frame.data }, 'Receiving answer for a PING.');
+      var callback = this._pings[id];
+      if (callback) {
+        callback();
+      }
+      delete this._pings[id];
+    } else {
+      this._log.warn({ data: frame.data }, 'Unsolicited PING answer.');
+    }
+
+  } else {
+    this._log.debug({ data: frame.data }, 'Answering PING.');
+    this.push({
+      type: 'PING',
+      flags: {
+        ACK: true
+      },
+      stream: 0,
+      data: frame.data
+    });
+  }
+};
+
+// Terminating the connection
+Connection.prototype.close = function close(error) {
+  if (this._closed) {
+    this._log.warn('Trying to close an already closed connection');
+    return;
+  }
+
+  this._log.debug({ error: error }, 'Closing the connection');
+  this.push({
+    type: 'GOAWAY',
+    flags: {},
+    stream: 0,
+    last_stream: this._lastIncomingStream,
+    error: error || 'NO_ERROR'
+  });
+  this.push(null);
+  this._closed = true;
+};
+
+Connection.prototype._receiveGoaway = function _receiveGoaway(frame) {
+  this._log.debug({ error: frame.error }, 'Other end closed the connection');
+  this.push(null);
+  this._closed = true;
+  if (frame.error !== 'NO_ERROR') {
+    this.emit('peerError', frame.error);
+  }
+};
+
+// Flow control
+// ------------
+
+Connection.prototype._initializeFlowControl = function _initializeFlowControl() {
+  // Handling of initial window size of individual streams.
+  this._initialStreamWindowSize = INITIAL_STREAM_WINDOW_SIZE;
+  this.on('new_stream', function(stream) {
+    stream.upstream.setInitialWindow(this._initialStreamWindowSize);
+  });
+  this.on('RECEIVING_SETTINGS_INITIAL_WINDOW_SIZE', this._setInitialStreamWindowSize);
+  this._streamIds[0].upstream.setInitialWindow = function noop() {};
+};
+
+// The initial connection flow control window is 65535 bytes.
+var INITIAL_STREAM_WINDOW_SIZE = 65535;
+
+// A SETTINGS frame can alter the initial flow control window size for all current streams. When the
+// value of SETTINGS_INITIAL_WINDOW_SIZE changes, a receiver MUST adjust the window size of all
+// stream by calling the `setInitialStreamWindowSize` method. The window size has to be modified by
+// the difference between the new value and the old value.
+Connection.prototype._setInitialStreamWindowSize = function _setInitialStreamWindowSize(size) {
+  if ((this._initialStreamWindowSize === Infinity) && (size !== Infinity)) {
+    this._log.error('Trying to manipulate initial flow control window size after flow control was turned off.');
+    this.emit('error', 'FLOW_CONTROL_ERROR');
+  } else {
+    this._log.debug({ size: size }, 'Changing stream initial window size.');
+    this._initialStreamWindowSize = size;
+    this._streamIds.forEach(function(stream) {
+      stream.upstream.setInitialWindow(size);
+    });
+  }
+};