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