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'use strict'
var assert = require('assert')
var http = require('http')
var https = require('https')
var net = require('net')
var util = require('util')
var transport = require('spdy-transport')
var debug = require('debug')('spdy:client')
// Node.js 0.10 and 0.12 support
Object.assign = process.versions.modules >= 46
? Object.assign // eslint-disable-next-line
: util._extend
var EventEmitter = require('events').EventEmitter
var spdy = require('../spdy')
var mode = /^v0\.8\./.test(process.version)
? 'rusty'
: /^v0\.(9|10)\./.test(process.version)
? 'old'
: /^v0\.12\./.test(process.version)
? 'normal'
: 'modern'
var proto = {}
function instantiate (base) {
function Agent (options) {
this._init(base, options)
}
util.inherits(Agent, base)
Agent.create = function create (options) {
return new Agent(options)
}
Object.keys(proto).forEach(function (key) {
Agent.prototype[key] = proto[key]
})
return Agent
}
proto._init = function _init (base, options) {
base.call(this, options)
var state = {}
this._spdyState = state
state.host = options.host
state.options = options.spdy || {}
state.secure = this instanceof https.Agent
state.fallback = false
state.createSocket = this._getCreateSocket()
state.socket = null
state.connection = null
// No chunked encoding
this.keepAlive = false
var self = this
this._connect(options, function (err, connection) {
if (err) {
return self.emit('error', err)
}
state.connection = connection
self.emit('_connect')
})
}
proto._getCreateSocket = function _getCreateSocket () {
// Find super's `createSocket` method
var createSocket
var cons = this.constructor.super_
do {
createSocket = cons.prototype.createSocket
if (cons.super_ === EventEmitter || !cons.super_) {
break
}
cons = cons.super_
} while (!createSocket)
if (!createSocket) {
createSocket = http.Agent.prototype.createSocket
}
assert(createSocket, '.createSocket() method not found')
return createSocket
}
proto._connect = function _connect (options, callback) {
var self = this
var state = this._spdyState
var protocols = state.options.protocols || [
'h2',
'spdy/3.1', 'spdy/3', 'spdy/2',
'http/1.1', 'http/1.0'
]
// TODO(indutny): reconnect automatically?
var socket = this.createConnection(Object.assign({
NPNProtocols: protocols,
ALPNProtocols: protocols,
servername: options.servername || options.host
}, options))
state.socket = socket
socket.setNoDelay(true)
function onError (err) {
return callback(err)
}
socket.on('error', onError)
socket.on(state.secure ? 'secureConnect' : 'connect', function () {
socket.removeListener('error', onError)
var protocol
if (state.secure) {
protocol = socket.npnProtocol ||
socket.alpnProtocol ||
state.options.protocol
} else {
protocol = state.options.protocol
}
// HTTP server - kill socket and switch to the fallback mode
if (!protocol || protocol === 'http/1.1' || protocol === 'http/1.0') {
debug('activating fallback')
socket.destroy()
state.fallback = true
return
}
debug('connected protocol=%j', protocol)
var connection = transport.connection.create(socket, Object.assign({
protocol: /spdy/.test(protocol) ? 'spdy' : 'http2',
isServer: false
}, state.options.connection || {}))
// Pass connection level errors are passed to the agent.
connection.on('error', function (err) {
self.emit('error', err)
})
// Set version when we are certain
if (protocol === 'h2') {
connection.start(4)
} else if (protocol === 'spdy/3.1') {
connection.start(3.1)
} else if (protocol === 'spdy/3') {
connection.start(3)
} else if (protocol === 'spdy/2') {
connection.start(2)
} else {
socket.destroy()
callback(new Error('Unexpected protocol: ' + protocol))
return
}
if (state.options['x-forwarded-for'] !== undefined) {
connection.sendXForwardedFor(state.options['x-forwarded-for'])
}
callback(null, connection)
})
}
proto._createSocket = function _createSocket (req, options, callback) {
var state = this._spdyState
if (state.fallback) { return state.createSocket(req, options) }
var handle = spdy.handle.create(null, null, state.socket)
var socketOptions = {
handle: handle,
allowHalfOpen: true
}
var socket
if (state.secure) {
socket = new spdy.Socket(state.socket, socketOptions)
} else {
socket = new net.Socket(socketOptions)
}
handle.assignSocket(socket)
handle.assignClientRequest(req)
// Create stream only once `req.end()` is called
var self = this
handle.once('needStream', function () {
if (state.connection === null) {
self.once('_connect', function () {
handle.setStream(self._createStream(req, handle))
})
} else {
handle.setStream(self._createStream(req, handle))
}
})
// Yes, it is in reverse
req.on('response', function (res) {
handle.assignRequest(res)
})
handle.assignResponse(req)
// Handle PUSH
req.addListener('newListener', spdy.request.onNewListener)
// For v0.8
socket.readable = true
socket.writable = true
if (callback) {
return callback(null, socket)
}
return socket
}
if (mode === 'modern' || mode === 'normal') {
proto.createSocket = proto._createSocket
} else {
proto.createSocket = function createSocket (name, host, port, addr, req) {
var state = this._spdyState
if (state.fallback) {
return state.createSocket(name, host, port, addr, req)
}
return this._createSocket(req, {
host: host,
port: port
})
}
}
proto._createStream = function _createStream (req, handle) {
var state = this._spdyState
var self = this
return state.connection.reserveStream({
method: req.method,
path: req.path,
headers: req._headers,
host: state.host
}, function (err, stream) {
if (err) {
return self.emit('error', err)
}
stream.on('response', function (status, headers) {
handle.emitResponse(status, headers)
})
})
}
// Public APIs
proto.close = function close (callback) {
var state = this._spdyState
if (state.connection === null) {
this.once('_connect', function () {
this.close(callback)
})
return
}
state.connection.end(callback)
}
exports.Agent = instantiate(https.Agent)
exports.PlainAgent = instantiate(http.Agent)
exports.create = function create (base, options) {
if (typeof base === 'object') {
options = base
base = null
}
if (base) {
return instantiate(base).create(options)
}
if (options.spdy && options.spdy.plain) {
return exports.PlainAgent.create(options)
} else { return exports.Agent.create(options) }
}