1 | module.exports = ForeverAgent
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2 | ForeverAgent.SSL = ForeverAgentSSL
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3 |
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4 | var util = require('util')
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5 | , Agent = require('http').Agent
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6 | , net = require('net')
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7 | , tls = require('tls')
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8 | , AgentSSL = require('https').Agent
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9 |
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10 | function getConnectionName(host, port) {
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11 | var name = ''
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12 | if (typeof host === 'string') {
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13 | name = host + ':' + port
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14 | } else {
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15 |
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16 | name = host.host + ':' + host.port + ':' + (host.localAddress ? (host.localAddress + ':') : ':')
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17 | }
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18 | return name
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19 | }
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20 |
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21 | function ForeverAgent(options) {
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22 | var self = this
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23 | self.options = options || {}
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24 | self.requests = {}
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25 | self.sockets = {}
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26 | self.freeSockets = {}
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27 | self.maxSockets = self.options.maxSockets || Agent.defaultMaxSockets
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28 | self.minSockets = self.options.minSockets || ForeverAgent.defaultMinSockets
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29 | self.on('free', function(socket, host, port) {
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30 | var name = getConnectionName(host, port)
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31 |
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32 | if (self.requests[name] && self.requests[name].length) {
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33 | self.requests[name].shift().onSocket(socket)
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34 | } else if (self.sockets[name].length < self.minSockets) {
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35 | if (!self.freeSockets[name]) self.freeSockets[name] = []
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36 | self.freeSockets[name].push(socket)
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37 |
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38 |
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39 | var onIdleError = function() {
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40 | socket.destroy()
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41 | }
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42 | socket._onIdleError = onIdleError
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43 | socket.on('error', onIdleError)
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44 | } else {
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45 |
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46 |
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47 |
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48 |
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49 | socket.destroy()
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50 | }
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51 | })
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52 |
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53 | }
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54 | util.inherits(ForeverAgent, Agent)
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55 |
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56 | ForeverAgent.defaultMinSockets = 5
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57 |
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58 |
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59 | ForeverAgent.prototype.createConnection = net.createConnection
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60 | ForeverAgent.prototype.addRequestNoreuse = Agent.prototype.addRequest
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61 | ForeverAgent.prototype.addRequest = function(req, host, port) {
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62 | var name = getConnectionName(host, port)
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63 |
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64 | if (typeof host !== 'string') {
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65 | var options = host
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66 | port = options.port
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67 | host = options.host
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68 | }
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69 |
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70 | if (this.freeSockets[name] && this.freeSockets[name].length > 0 && !req.useChunkedEncodingByDefault) {
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71 | var idleSocket = this.freeSockets[name].pop()
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72 | idleSocket.removeListener('error', idleSocket._onIdleError)
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73 | delete idleSocket._onIdleError
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74 | req._reusedSocket = true
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75 | req.onSocket(idleSocket)
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76 | } else {
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77 | this.addRequestNoreuse(req, host, port)
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78 | }
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79 | }
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80 |
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81 | ForeverAgent.prototype.removeSocket = function(s, name, host, port) {
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82 | if (this.sockets[name]) {
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83 | var index = this.sockets[name].indexOf(s)
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84 | if (index !== -1) {
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85 | this.sockets[name].splice(index, 1)
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86 | }
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87 | } else if (this.sockets[name] && this.sockets[name].length === 0) {
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88 |
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89 | delete this.sockets[name]
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90 | delete this.requests[name]
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91 | }
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92 |
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93 | if (this.freeSockets[name]) {
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94 | var index = this.freeSockets[name].indexOf(s)
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95 | if (index !== -1) {
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96 | this.freeSockets[name].splice(index, 1)
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97 | if (this.freeSockets[name].length === 0) {
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98 | delete this.freeSockets[name]
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99 | }
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100 | }
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101 | }
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102 |
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103 | if (this.requests[name] && this.requests[name].length) {
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104 |
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105 |
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106 | this.createSocket(name, host, port).emit('free')
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107 | }
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108 | }
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109 |
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110 | function ForeverAgentSSL (options) {
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111 | ForeverAgent.call(this, options)
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112 | }
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113 | util.inherits(ForeverAgentSSL, ForeverAgent)
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114 |
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115 | ForeverAgentSSL.prototype.createConnection = createConnectionSSL
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116 | ForeverAgentSSL.prototype.addRequestNoreuse = AgentSSL.prototype.addRequest
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117 |
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118 | function createConnectionSSL (port, host, options) {
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119 | if (typeof port === 'object') {
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120 | options = port;
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121 | } else if (typeof host === 'object') {
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122 | options = host;
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123 | } else if (typeof options === 'object') {
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124 | options = options;
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125 | } else {
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126 | options = {};
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127 | }
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128 |
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129 | if (typeof port === 'number') {
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130 | options.port = port;
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131 | }
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132 |
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133 | if (typeof host === 'string') {
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134 | options.host = host;
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135 | }
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136 |
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137 | return tls.connect(options);
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138 | }
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