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{ channelManager } from './ChannelManager'\nimport { Channel } from \"amqplib/callback_api\"\nimport {Options} from \"amqplib/properties\";\nconst EXCHANGE_PREFIX = \"nimbus:event:\";\nconst EXCHANGE_ALL_EVENTS = \"nimbus:events\";\nconst EXCHANGE_EVENTS_BY_USER = \"nimbus:eventsByUser\";\nconst QUEUE_PREFIX = \"nimbus:listener:\";\nconst QUEUE_OPTIONS = { durable: false, autoDelete: true, exclusive: true};\nconst PERSISTENT_QUEUE_OPTIONS = { durable: true, autoDelete: false, exclusive: false};\nconst QUEUE_RUNTIME_OPTIONS = { durable: false, autoDelete: true};\nconst EXCHANGE_OPTIONS = { durable: true, autoDelete: false };\n\nimport util = require(\"util\");\n\nvar debug = util.debuglog(\"amqptools\");\n\nexport interface EventListenerConstructorOptions {\n exchange?: string;\n runtime?: string;\n topic?: string;\n userId?: string;\n persistent?: boolean;\n autoAck?: boolean;\n prefetchCount?: number;\n}\n\nexport interface MessageExtra {\n ack?: () => void\n}\n\nexport interface ListenerFunc {\n (message: any, extra: MessageExtra): void\n}\n\nexport class EventListener {\n exchange: string;\n topic: string;\n queue: string;\n userId: string;\n // listener queue wont be removed after client disconnects(durable + no auto-delete)\n persistent: boolean = false;\n // auto-ack event message\n autoAck: boolean = true;\n prefetchCount: number;\n private listener: ListenerFunc;\n private queueOptions: Options.AssertQueue;\n private consumerTag: string;\n\n constructor(options: EventListenerConstructorOptions) {\n this.exchange = options.exchange;\n this.topic = options.topic;\n this.userId = options.userId;\n this.queueOptions = QUEUE_OPTIONS;\n this.prefetchCount = options.prefetchCount || 1\n if(options.hasOwnProperty(\"persistent\")) {\n this.persistent = options.persistent;\n }\n if(options.hasOwnProperty(\"autoAck\")) {\n this.autoAck = options.autoAck;\n }\n if (options.runtime) {\n this.queue = QUEUE_PREFIX + options.runtime +\n (this.exchange ? ':' + this.exchange : '') +\n (this.topic ? ':' + this.topic : '');\n this.queueOptions = QUEUE_RUNTIME_OPTIONS;\n if(this.persistent) {\n this.queueOptions = PERSISTENT_QUEUE_OPTIONS;\n }\n }\n\n channelManager.on(\"reconnect\", this.onReconnect);\n }\n\n onReconnect = () => {\n debug(\"Trying to re establish consuming on event queue %s\", this.queueName);\n this.consume();\n }\n\n get fullExchangeName(): string {\n if (this.userId) {\n return EXCHANGE_EVENTS_BY_USER;\n }\n return this.exchange ? EXCHANGE_PREFIX + this.exchange : EXCHANGE_ALL_EVENTS;\n }\n\n get queueName(): string {\n return this.queue;\n }\n\n get routeKey(): string {\n if (!this.topic && !this.exchange && !this.userId) return '#';\n return [this.exchange, this.topic]\n .map(str => (str ? str : '*'))\n .join('.')\n .concat(this.userId ? '.' + this.userId : '');\n }\n\n set queueName(val: string) {\n this.queue = val;\n }\n\n private assertExchange() {\n return channelManager.getChannel().then((channel) => {\n return new Promise((resolve, reject) => {\n channel.assertExchange(this.fullExchangeName, \"topic\", EXCHANGE_OPTIONS,\n (err) => err ? reject(err) : resolve(channel));\n })\n })\n }\n\n private assertQueue() {\n return channelManager.getChannel().then((channel) => {\n return new Promise((resolve, reject) => {\n channel.assertQueue(this.queueName, this.queueOptions, (err, ok) => {\n if (err) return reject(err);\n this.queueName = ok.queue;\n resolve(channel);\n });\n })\n })\n }\n\n private bindQueue() {\n return channelManager.getChannel().then((channel) => {\n return new Promise<Channel>((resolve, reject) => {\n channel.bindQueue(this.queueName, this.fullExchangeName, this.routeKey, {},\n (err) => err ? reject(err) : resolve(channel));\n })\n })\n }\n\n private ack(msg) {\n return channelManager.getChannel().then((channel) => {\n channel.ack(msg);\n });\n }\n\n private onMessageReceived = (msg) => {\n var message = JSON.parse(msg.content.toString());\n var extra: MessageExtra = {};\n if(this.autoAck) {\n this.ack(msg);\n }\n else {\n extra.ack = () => {\n this.ack(msg);\n };\n }\n this.listener(message, extra);\n }\n\n private consume() {\n let _this = this;\n return this.assertExchange()\n .then(() => this.assertQueue())\n .then(() => this.bindQueue())\n .then((channel) => {\n channel.prefetch(this.prefetchCount)\n channel.consume(this.queueName, this.onMessageReceived, undefined, function (err, ok) {\n if(err) {\n console.error(\"Fail to consume on queue \" + _this.queueName, err)\n throw err\n }\n _this.consumerTag = ok.consumerTag;\n });\n });\n }\n\n listen(listener: (message, extra?) => void) {\n if(this.listener) {\n throw new Error(\"Listener is already set\");\n }\n this.listener = listener;\n return this.consume();\n }\n\n cancel() {\n channelManager.getChannel().then((channel) => {\n channel.cancel(this.consumerTag);\n channelManager.removeListener(\"reconnect\", this.onReconnect);\n }) \n }\n}"]} |