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{ Channel, Connection, connect as amqpConnect } from \"amqplib/callback_api\";\nimport { EventEmitter } from \"events\";\nimport util = require('util');\n\nconst MAX_LISTENERS = 10000;\n\nvar debug = util.debuglog(\"amqptools\");\n\nexport class ChannelManager extends EventEmitter {\n connectionURI: string;\n channel: Channel;\n channelPromise: Promise<Channel>;\n connection: Connection;\n maxReconnectionAttempts = 100;\n randomReconnectionInterval = true;\n\n eventListeners: Event\n\n private connectCallbacks: ((err: Error, channel: Channel) => void)[] = [];\n private connectInProgress: boolean;\n\n constructor() {\n super();\n this.setMaxListeners(MAX_LISTENERS);\n }\n\n onConnectionClose = (error) => {\n debug(\"amqp connection has been closed\");\n this.channel = null;\n this.connection = null;\n this.channelPromise = null;\n var reconnections = 0;\n var tryReconnect = () => {\n debug(\"Reconnection attempt...\");\n this.connect((err) => {\n reconnections++;\n if (!err) {\n this.emit(\"reconnect\");\n return debug(\"Connection has been restored\");\n }\n if (reconnections >= this.maxReconnectionAttempts) {\n throw new Error(\"Fail to establish a connection with rabbitmq\");\n }\n var timeout = this.randomReconnectionInterval ? Math.floor(Math.random()*(10-1)) + 1 : 1;\n debug(\"Next reconnect in %d seconds\", timeout);\n setTimeout(tryReconnect, timeout * 1000);\n });\n };\n tryReconnect();\n }\n\n connect(cb) {\n if (this.channel) {\n return cb(null, this.channel);\n }\n\n this.connectCallbacks.push(cb);\n if (this.connectInProgress) return;\n this.connectInProgress = true;\n\n amqpConnect(this.connectionURI, (err, connection) => {\n if (err) {\n return this.connectRespond(err, null);\n }\n this.connection = connection;\n this.connection.on(\"close\", this.onConnectionClose);\n this.connection.createChannel((err, channel) => {\n if (err) {\n return this.connectRespond(err, null);\n }\n this.channel = channel;\n\n this.channel.on('error', () => { this.reconnect() });\n\n this.connectRespond(null, this.channel)\n });\n });\n }\n\n connectRespond(err, channel) {\n this.connectInProgress = false;\n if (err) {\n debug(\"Fail to connect...\", err);\n }\n else {\n debug(\"Connected\");\n }\n this.connectCallbacks.forEach((extraCb) => {\n if (!extraCb) return;\n extraCb(err, channel);\n });\n this.connectCallbacks = [];\n }\n\n getChannel(): Promise<Channel> {\n return new Promise<Channel>((resolve, reject) => {\n if (this.channel) {\n return resolve(this.channel);\n }\n this.connect((err, channel) => {\n if (err) return reject(err);\n resolve(channel);\n })\n });\n }\n\n setConnectionURI(uri) {\n this.connectionURI = uri;\n }\n\n disconnect(cb) {\n if (!this.connection) {\n return cb();\n }\n this.connection.removeListener(\"close\", this.onConnectionClose);\n this.connection.close(() => {\n this.connection = null;\n this.channel = null;\n this.channelPromise = null;\n cb();\n });\n }\n\n reconnect(cb?) {\n this.disconnect(() => {\n this.connect(cb);\n });\n }\n}\n\nexport var channelManager = new ChannelManager();"]} |