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710 lines
16 KiB
710 lines
16 KiB
'use strict' |
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var transport = require('../spdy-transport') |
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var assert = require('assert') |
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var util = require('util') |
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var debug = { |
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client: require('debug')('spdy:stream:client'), |
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server: require('debug')('spdy:stream:server') |
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} |
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var Duplex = require('readable-stream').Duplex |
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function Stream (connection, options) { |
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Duplex.call(this) |
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var connectionState = connection._spdyState |
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var state = {} |
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this._spdyState = state |
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this.id = options.id |
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this.method = options.method |
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this.path = options.path |
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this.host = options.host |
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this.headers = options.headers || {} |
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this.connection = connection |
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this.parent = options.parent || null |
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state.socket = null |
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state.protocol = connectionState.protocol |
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state.constants = state.protocol.constants |
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// See _initPriority() |
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state.priority = null |
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state.version = this.connection.getVersion() |
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state.isServer = this.connection.isServer() |
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state.debug = state.isServer ? debug.server : debug.client |
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state.framer = connectionState.framer |
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state.parser = connectionState.parser |
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state.request = options.request |
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state.needResponse = options.request |
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state.window = connectionState.streamWindow.clone(options.id) |
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state.sessionWindow = connectionState.window |
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state.maxChunk = connectionState.maxChunk |
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// Can't send incoming request |
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// (See `.send()` method) |
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state.sent = !state.request |
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state.readable = options.readable !== false |
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state.writable = options.writable !== false |
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state.aborted = false |
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state.corked = 0 |
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state.corkQueue = [] |
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state.timeout = new transport.utils.Timeout(this) |
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this.on('finish', this._onFinish) |
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this.on('end', this._onEnd) |
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var self = this |
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function _onWindowOverflow () { |
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self._onWindowOverflow() |
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} |
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state.window.recv.on('overflow', _onWindowOverflow) |
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state.window.send.on('overflow', _onWindowOverflow) |
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this._initPriority(options.priority) |
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if (!state.readable) { this.push(null) } |
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if (!state.writable) { |
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this._writableState.ended = true |
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this._writableState.finished = true |
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} |
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} |
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util.inherits(Stream, Duplex) |
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exports.Stream = Stream |
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Stream.prototype._init = function _init (socket) { |
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this.socket = socket |
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} |
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Stream.prototype._initPriority = function _initPriority (priority) { |
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var state = this._spdyState |
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var connectionState = this.connection._spdyState |
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var root = connectionState.priorityRoot |
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if (!priority) { |
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state.priority = root.addDefault(this.id) |
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return |
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} |
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state.priority = root.add({ |
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id: this.id, |
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parent: priority.parent, |
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weight: priority.weight, |
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exclusive: priority.exclusive |
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}) |
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} |
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Stream.prototype._handleFrame = function _handleFrame (frame) { |
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var state = this._spdyState |
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// Ignore any kind of data after abort |
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if (state.aborted) { |
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state.debug('id=%d ignoring frame=%s after abort', this.id, frame.type) |
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return |
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} |
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// Restart the timer on incoming frames |
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state.timeout.reset() |
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if (frame.type === 'DATA') { |
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this._handleData(frame) |
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} else if (frame.type === 'HEADERS') { |
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this._handleHeaders(frame) |
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} else if (frame.type === 'RST') { |
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this._handleRST(frame) |
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} else if (frame.type === 'WINDOW_UPDATE') { this._handleWindowUpdate(frame) } else if (frame.type === 'PRIORITY') { |
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this._handlePriority(frame) |
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} else if (frame.type === 'PUSH_PROMISE') { this._handlePushPromise(frame) } |
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if (frame.fin) { |
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state.debug('id=%d end', this.id) |
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this.push(null) |
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} |
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} |
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function checkAborted (stream, state, callback) { |
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if (state.aborted) { |
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state.debug('id=%d abort write', stream.id) |
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process.nextTick(function () { |
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callback(new Error('Stream write aborted')) |
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}) |
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return true |
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} |
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return false |
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} |
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function _send (stream, state, data, callback) { |
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if (checkAborted(stream, state, callback)) { |
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return |
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} |
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state.debug('id=%d presend=%d', stream.id, data.length) |
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state.timeout.reset() |
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state.window.send.update(-data.length, function () { |
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if (checkAborted(stream, state, callback)) { |
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return |
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} |
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state.debug('id=%d send=%d', stream.id, data.length) |
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state.timeout.reset() |
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state.framer.dataFrame({ |
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id: stream.id, |
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priority: state.priority.getPriority(), |
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fin: false, |
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data: data |
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}, function (err) { |
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state.debug('id=%d postsend=%d', stream.id, data.length) |
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callback(err) |
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}) |
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}) |
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} |
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Stream.prototype._write = function _write (data, enc, callback) { |
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var state = this._spdyState |
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// Send the request if it wasn't sent |
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if (!state.sent) { this.send() } |
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// Writes should come after pending control frames (response and headers) |
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if (state.corked !== 0) { |
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var self = this |
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state.corkQueue.push(function () { |
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self._write(data, enc, callback) |
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}) |
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return |
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} |
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// Split DATA in chunks to prevent window from going negative |
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this._splitStart(data, _send, callback) |
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} |
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Stream.prototype._splitStart = function _splitStart (data, onChunk, callback) { |
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return this._split(data, 0, onChunk, callback) |
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} |
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Stream.prototype._split = function _split (data, offset, onChunk, callback) { |
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if (offset === data.length) { |
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return process.nextTick(callback) |
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} |
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var state = this._spdyState |
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var local = state.window.send |
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var session = state.sessionWindow.send |
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var availSession = Math.max(0, session.getCurrent()) |
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if (availSession === 0) { |
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availSession = session.getMax() |
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} |
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var availLocal = Math.max(0, local.getCurrent()) |
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if (availLocal === 0) { |
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availLocal = local.getMax() |
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} |
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var avail = Math.min(availSession, availLocal) |
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avail = Math.min(avail, state.maxChunk) |
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var self = this |
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if (avail === 0) { |
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state.window.send.update(0, function () { |
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self._split(data, offset, onChunk, callback) |
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}) |
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return |
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} |
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// Split data in chunks in a following way: |
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var limit = avail |
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var size = Math.min(data.length - offset, limit) |
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var chunk = data.slice(offset, offset + size) |
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onChunk(this, state, chunk, function (err) { |
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if (err) { return callback(err) } |
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// Get the next chunk |
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self._split(data, offset + size, onChunk, callback) |
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}) |
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} |
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Stream.prototype._read = function _read () { |
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var state = this._spdyState |
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if (!state.window.recv.isDraining()) { |
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return |
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} |
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var delta = state.window.recv.getDelta() |
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state.debug('id=%d window emptying, update by %d', this.id, delta) |
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state.window.recv.update(delta) |
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state.framer.windowUpdateFrame({ |
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id: this.id, |
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delta: delta |
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}) |
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} |
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Stream.prototype._handleData = function _handleData (frame) { |
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var state = this._spdyState |
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// DATA on ended or not readable stream! |
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if (!state.readable || this._readableState.ended) { |
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state.framer.rstFrame({ id: this.id, code: 'STREAM_CLOSED' }) |
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return |
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} |
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state.debug('id=%d recv=%d', this.id, frame.data.length) |
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state.window.recv.update(-frame.data.length) |
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this.push(frame.data) |
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} |
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Stream.prototype._handleRST = function _handleRST (frame) { |
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if (frame.code !== 'CANCEL') { |
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this.emit('error', new Error('Got RST: ' + frame.code)) |
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} |
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this.abort() |
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} |
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Stream.prototype._handleWindowUpdate = function _handleWindowUpdate (frame) { |
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var state = this._spdyState |
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state.window.send.update(frame.delta) |
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} |
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Stream.prototype._onWindowOverflow = function _onWindowOverflow () { |
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var state = this._spdyState |
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state.debug('id=%d window overflow', this.id) |
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state.framer.rstFrame({ id: this.id, code: 'FLOW_CONTROL_ERROR' }) |
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this.aborted = true |
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this.emit('error', new Error('HTTP2 window overflow')) |
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} |
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Stream.prototype._handlePriority = function _handlePriority (frame) { |
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var state = this._spdyState |
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state.priority.remove() |
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state.priority = null |
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this._initPriority(frame.priority) |
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// Mostly for testing purposes |
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this.emit('priority', frame.priority) |
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} |
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Stream.prototype._handleHeaders = function _handleHeaders (frame) { |
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var state = this._spdyState |
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if (!state.readable || this._readableState.ended) { |
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state.framer.rstFrame({ id: this.id, code: 'STREAM_CLOSED' }) |
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return |
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} |
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if (state.needResponse) { |
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return this._handleResponse(frame) |
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} |
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this.emit('headers', frame.headers) |
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} |
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Stream.prototype._handleResponse = function _handleResponse (frame) { |
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var state = this._spdyState |
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if (frame.headers[':status'] === undefined) { |
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state.framer.rstFrame({ id: this.id, code: 'PROTOCOL_ERROR' }) |
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return |
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} |
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state.needResponse = false |
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this.emit('response', frame.headers[':status'] | 0, frame.headers) |
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} |
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Stream.prototype._onFinish = function _onFinish () { |
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var state = this._spdyState |
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// Send the request if it wasn't sent |
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if (!state.sent) { |
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// NOTE: will send HEADERS with FIN flag |
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this.send() |
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} else { |
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// Just an `.end()` without any writes will trigger immediate `finish` event |
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// without any calls to `_write()`. |
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if (state.corked !== 0) { |
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var self = this |
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state.corkQueue.push(function () { |
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self._onFinish() |
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}) |
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return |
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} |
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state.framer.dataFrame({ |
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id: this.id, |
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priority: state.priority.getPriority(), |
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fin: true, |
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data: Buffer.alloc(0) |
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}) |
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} |
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this._maybeClose() |
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} |
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Stream.prototype._onEnd = function _onEnd () { |
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this._maybeClose() |
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} |
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Stream.prototype._checkEnded = function _checkEnded (callback) { |
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var state = this._spdyState |
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var ended = false |
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if (state.aborted) { ended = true } |
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if (!state.writable || this._writableState.finished) { ended = true } |
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if (!ended) { |
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return true |
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} |
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if (!callback) { |
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return false |
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} |
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var err = new Error('Ended stream can\'t send frames') |
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process.nextTick(function () { |
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callback(err) |
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}) |
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return false |
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} |
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Stream.prototype._maybeClose = function _maybeClose () { |
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var state = this._spdyState |
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// .abort() emits `close` |
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if (state.aborted) { |
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return |
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} |
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if ((!state.readable || this._readableState.ended) && |
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this._writableState.finished) { |
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// Clear timeout |
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state.timeout.set(0) |
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this.emit('close') |
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} |
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} |
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Stream.prototype._handlePushPromise = function _handlePushPromise (frame) { |
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var push = this.connection._createStream({ |
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id: frame.promisedId, |
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parent: this, |
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push: true, |
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request: true, |
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method: frame.headers[':method'], |
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path: frame.headers[':path'], |
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host: frame.headers[':authority'], |
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priority: frame.priority, |
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headers: frame.headers, |
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writable: false |
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}) |
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// GOAWAY |
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if (this.connection._isGoaway(push.id)) { |
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return |
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} |
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if (!this.emit('pushPromise', push)) { |
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push.abort() |
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} |
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} |
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Stream.prototype._hardCork = function _hardCork () { |
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var state = this._spdyState |
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this.cork() |
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state.corked++ |
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} |
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Stream.prototype._hardUncork = function _hardUncork () { |
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var state = this._spdyState |
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this.uncork() |
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state.corked-- |
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if (state.corked !== 0) { |
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return |
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} |
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// Invoke callbacks |
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var queue = state.corkQueue |
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state.corkQueue = [] |
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for (var i = 0; i < queue.length; i++) { |
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queue[i]() |
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} |
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} |
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Stream.prototype._sendPush = function _sendPush (status, response, callback) { |
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var self = this |
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var state = this._spdyState |
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this._hardCork() |
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state.framer.pushFrame({ |
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id: this.parent.id, |
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promisedId: this.id, |
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priority: state.priority.toJSON(), |
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path: this.path, |
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host: this.host, |
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method: this.method, |
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status: status, |
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headers: this.headers, |
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response: response |
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}, function (err) { |
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self._hardUncork() |
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callback(err) |
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}) |
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} |
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Stream.prototype._wasSent = function _wasSent () { |
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var state = this._spdyState |
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return state.sent |
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} |
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// Public API |
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Stream.prototype.send = function send (callback) { |
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var state = this._spdyState |
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if (state.sent) { |
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var err = new Error('Stream was already sent') |
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process.nextTick(function () { |
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if (callback) { |
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callback(err) |
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} |
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}) |
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return |
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} |
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state.sent = true |
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state.timeout.reset() |
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// GET requests should always be auto-finished |
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if (this.method === 'GET') { |
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this._writableState.ended = true |
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this._writableState.finished = true |
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} |
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// TODO(indunty): ideally it should just take a stream object as an input |
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var self = this |
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this._hardCork() |
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state.framer.requestFrame({ |
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id: this.id, |
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method: this.method, |
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path: this.path, |
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host: this.host, |
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priority: state.priority.toJSON(), |
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headers: this.headers, |
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fin: this._writableState.finished |
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}, function (err) { |
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self._hardUncork() |
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if (!callback) { |
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return |
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} |
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callback(err) |
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}) |
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} |
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Stream.prototype.respond = function respond (status, headers, callback) { |
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var self = this |
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var state = this._spdyState |
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assert(!state.request, 'Can\'t respond on request') |
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state.timeout.reset() |
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if (!this._checkEnded(callback)) { return } |
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var frame = { |
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id: this.id, |
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status: status, |
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headers: headers |
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} |
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this._hardCork() |
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state.framer.responseFrame(frame, function (err) { |
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self._hardUncork() |
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if (callback) { callback(err) } |
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}) |
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} |
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Stream.prototype.setWindow = function setWindow (size) { |
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var state = this._spdyState |
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state.timeout.reset() |
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if (!this._checkEnded()) { |
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return |
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} |
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state.debug('id=%d force window max=%d', this.id, size) |
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state.window.recv.setMax(size) |
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var delta = state.window.recv.getDelta() |
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if (delta === 0) { return } |
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state.framer.windowUpdateFrame({ |
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id: this.id, |
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delta: delta |
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}) |
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state.window.recv.update(delta) |
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} |
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Stream.prototype.sendHeaders = function sendHeaders (headers, callback) { |
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var self = this |
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var state = this._spdyState |
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state.timeout.reset() |
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if (!this._checkEnded(callback)) { |
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return |
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} |
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// Request wasn't yet send, coalesce headers |
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if (!state.sent) { |
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this.headers = Object.assign({}, this.headers) |
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Object.assign(this.headers, headers) |
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process.nextTick(function () { |
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if (callback) { |
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callback(null) |
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} |
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}) |
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return |
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} |
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this._hardCork() |
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state.framer.headersFrame({ |
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id: this.id, |
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headers: headers |
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}, function (err) { |
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self._hardUncork() |
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if (callback) { callback(err) } |
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}) |
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} |
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Stream.prototype._destroy = function destroy () { |
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this.abort() |
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} |
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Stream.prototype.abort = function abort (code, callback) { |
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var state = this._spdyState |
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// .abort(callback) |
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if (typeof code === 'function') { |
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callback = code |
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code = null |
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} |
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if (this._readableState.ended && this._writableState.finished) { |
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state.debug('id=%d already closed', this.id) |
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if (callback) { |
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process.nextTick(callback) |
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} |
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return |
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} |
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if (state.aborted) { |
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state.debug('id=%d already aborted', this.id) |
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if (callback) { process.nextTick(callback) } |
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return |
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} |
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state.aborted = true |
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state.debug('id=%d abort', this.id) |
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this.setTimeout(0) |
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var abortCode = code || 'CANCEL' |
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state.framer.rstFrame({ |
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id: this.id, |
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code: abortCode |
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}) |
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var self = this |
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process.nextTick(function () { |
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if (callback) { |
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callback(null) |
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} |
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self.emit('close', new Error('Aborted, code: ' + abortCode)) |
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}) |
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} |
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Stream.prototype.setPriority = function setPriority (info) { |
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var state = this._spdyState |
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state.timeout.reset() |
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if (!this._checkEnded()) { |
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return |
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} |
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state.debug('id=%d priority change', this.id, info) |
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var frame = { id: this.id, priority: info } |
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// Change priority on this side |
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this._handlePriority(frame) |
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|
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// And on the other too |
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state.framer.priorityFrame(frame) |
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} |
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Stream.prototype.pushPromise = function pushPromise (uri, callback) { |
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if (!this._checkEnded(callback)) { |
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return |
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} |
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var self = this |
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this._hardCork() |
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var push = this.connection.pushPromise(this, uri, function (err) { |
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self._hardUncork() |
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if (!err) { |
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push._hardUncork() |
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} |
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if (callback) { |
|
return callback(err, push) |
|
} |
|
|
|
if (err) { push.emit('error', err) } |
|
}) |
|
push._hardCork() |
|
|
|
return push |
|
} |
|
|
|
Stream.prototype.setMaxChunk = function setMaxChunk (size) { |
|
var state = this._spdyState |
|
state.maxChunk = size |
|
} |
|
|
|
Stream.prototype.setTimeout = function setTimeout (delay, callback) { |
|
var state = this._spdyState |
|
|
|
state.timeout.set(delay, callback) |
|
}
|
|
|