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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 | 1× 1× 1× 1× 3434× 3434× 3434× 3434× 3434× 3434× 3434× 3434× 3434× 1× 1× 900× 900× 900× 1× 193× 193× 193× 193× 193× 1× 1× 12549× 1061× 1061× 1061× 11488× 11488× 4× 4× 11484× 11484× 4769× 4769× 11484× 4189× 4189× 11484× 11484× 1× 3108× 1× 2086× 1× 2315× 1× 8519× 1× 3997× 1× 11484× 1057× 10427× 10427× 1057× 1057× 1057× 1057× 1057× 10427× 1× 1717× 1717× 1717× 1717× 1717× 1× 1× 513× | 'use strict' var util = require('util') var EventEmitter = require('events').EventEmitter var debug = { server: require('debug')('spdy:window:server'), client: require('debug')('spdy:window:client') } function Side (window, name, options) { EventEmitter.call(this) this.name = name this.window = window this.current = options.size this.max = options.size this.limit = options.max this.lowWaterMark = options.lowWaterMark === undefined ? this.max / 2 : options.lowWaterMark this._refilling = false this._refillQueue = [] } util.inherits(Side, EventEmitter) Side.prototype.setMax = function setMax (max) { this.window.debug('id=%d side=%s setMax=%d', this.window.id, this.name, max) this.max = max this.lowWaterMark = this.max / 2 } Side.prototype.updateMax = function updateMax (max) { var delta = max - this.max this.window.debug('id=%d side=%s updateMax=%d delta=%d', this.window.id, this.name, max, delta) this.max = max this.lowWaterMark = max / 2 this.update(delta) } Side.prototype.setLowWaterMark = function setLowWaterMark (lwm) { this.lowWaterMark = lwm } Side.prototype.update = function update (size, callback) { // Not enough space for the update, wait for refill if (size <= 0 && callback && this.isEmpty()) { this.window.debug('id=%d side=%s wait for refill=%d [%d/%d]', this.window.id, this.name, -size, this.current, this.max) this._refillQueue.push({ size: size, callback: callback }) return } this.current += size if (this.current > this.limit) { this.emit('overflow') return } this.window.debug('id=%d side=%s update by=%d [%d/%d]', this.window.id, this.name, size, this.current, this.max) // Time to send WINDOW_UPDATE if (size < 0 && this.isDraining()) { this.window.debug('id=%d side=%s drained', this.window.id, this.name) this.emit('drain') } // Time to write if (size > 0 && this.current > 0 && this.current <= size) { this.window.debug('id=%d side=%s full', this.window.id, this.name) this.emit('full') } this._processRefillQueue() if (callback) { process.nextTick(callback) } } Side.prototype.getCurrent = function getCurrent () { return this.current } Side.prototype.getMax = function getMax () { return this.max } Side.prototype.getDelta = function getDelta () { return this.max - this.current } Side.prototype.isDraining = function isDraining () { return this.current <= this.lowWaterMark } Side.prototype.isEmpty = function isEmpty () { return this.current <= 0 } // Private Side.prototype._processRefillQueue = function _processRefillQueue () { // Prevent recursion if (this._refilling) { return } this._refilling = true while (this._refillQueue.length > 0) { var item = this._refillQueue[0] Iif (this.isEmpty()) { break } this.window.debug('id=%d side=%s refilled for size=%d', this.window.id, this.name, -item.size) this._refillQueue.shift() this.update(item.size, item.callback) } this._refilling = false } function Window (options) { this.id = options.id this.isServer = options.isServer this.debug = this.isServer ? debug.server : debug.client this.recv = new Side(this, 'recv', options.recv) this.send = new Side(this, 'send', options.send) } module.exports = Window Window.prototype.clone = function clone (id) { return new Window({ id: id, isServer: this.isServer, recv: { size: this.recv.max, max: this.recv.limit, lowWaterMark: this.recv.lowWaterMark }, send: { size: this.send.max, max: this.send.limit, lowWaterMark: this.send.lowWaterMark } }) } |