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{ channelManager } from './ChannelManager'\nimport { TaskManager } from \"./TaskManager\"\nimport { Channel } from \"amqplib/callback_api\"\n\nimport uuid = require(\"node-uuid\")\nimport util = require(\"util\")\n\nconst EXCHANGE_PREFIX = \"nimbus:jobs:\";\nconst EXCHANGE_OPTIONS = {durable: true, autoDelete: false};\n\nconst JOB_QUEUE_PREFIX = \"nimbus:jobs:queue:\";\nconst JOB_QUEUE_OPTIONS = {durable: true, autoDelete: false};\n\nconst debug = util.debuglog(\"amqptools\");\n\nexport interface TaskParams {\n title: string,\n data: any\n}\n\nexport class Task {\n uuid:string;\n type:string;\n params:TaskParams;\n taskCallback: any;\n opts: any;\n static taskManager:TaskManager;\n\n constructor(type:string, params?:TaskParams) {\n this.uuid = uuid.v4();\n this.type = type;\n this.params = params;\n\n channelManager.on(\"reconnect\", this.onReconnect);\n }\n\n onReconnect = () => {\n if(this.taskCallback) {\n debug(\"Trying to re establish consuming on task queue %s\", this.queueName);\n this.consume();\n }\n }\n\n get exchangeName() {\n return EXCHANGE_PREFIX + Task.taskManager.service;\n }\n\n get queueName() {\n return JOB_QUEUE_PREFIX + this.type;\n }\n\n start(cb?) {\n if (!this.params) return;\n\n channelManager.getChannel()\n .then(() => this.assertExchange())\n .then(() => this.assertQueue())\n .then(() => this.bindQueue())\n .then((channel) => {\n let params = JSON.parse(JSON.stringify(this.params));\n params['uuid'] = this.uuid;\n var eventData = new Buffer(JSON.stringify(params));\n\n channel.publish(this.exchangeName, this.type, eventData);\n if (cb) cb();\n });\n\n return this;\n }\n\n private assertExchange() {\n return channelManager.getChannel().then((channel) => {\n return new Promise((resolve, reject) => {\n channel.assertExchange(this.exchangeName, 'direct', EXCHANGE_OPTIONS, (err) => {\n if (err) return reject(err);\n resolve(channel);\n })\n });\n })\n }\n\n private assertQueue() {\n return channelManager.getChannel().then((channel) => {\n return new Promise<Channel>((resolve, reject) => {\n channel.assertQueue(this.queueName, JOB_QUEUE_OPTIONS, (err) => {\n if (err) return reject(err);\n resolve(channel);\n })\n })\n })\n }\n\n private bindQueue() {\n return channelManager.getChannel().then((channel) => {\n channel.bindQueue(this.queueName, this.exchangeName, this.type);\n return channel;\n });\n }\n\n purgeQueue() {\n return channelManager.getChannel().then((channel) => {\n return new Promise((resolve, reject) => {\n channel.checkQueue(this.queueName, (err, ok) => {\n if (err) return resolve(null);\n if (ok) {\n return channel.purgeQueue(this.queueName, (err, reply) => {\n if (err) return reject(err);\n resolve(reply)\n })\n }\n resolve(null);\n })\n });\n });\n }\n\n consume() {\n return channelManager.getChannel()\n .then(() => this.assertQueue())\n .then((channel) => {\n channel.prefetch(this.opts.prefetchCount);\n debug(\"Attaching task listener for %s, prefetch=%d\", this.type, this.opts.prefetchCount);\n channel.consume(this.queueName, (msg) => {\n var taskData = JSON.parse(msg.content.toString());\n this.taskCallback(taskData, err => {\n if (err && err.nack) {\n // dead letter the message\n channel.nack(msg, false, false)\n } else {\n channel.ack(msg)\n }\n })\n }, {noAck: false});\n });\n }\n\n processTask(opts, taskCallback) {\n if(this.taskCallback) {\n throw new Error(\"Task callback already set\");\n }\n if(typeof opts === \"function\") {\n taskCallback = opts;\n opts = {};\n }\n this.taskCallback = taskCallback;\n opts = opts || {};\n opts.prefetchCount = opts.prefetchCount || 1;\n this.opts = opts;\n return this.consume();\n }\n}\n"]} |