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util = require(\"util\");\nimport async = require(\"async\");\nimport crypto = require(\"crypto\");\nimport randomString = require(\"just.randomstring\");\nimport { channelManager } from './ChannelManager';\nimport { promiseNodeify } from './promise-nodeify';\n\nconst QUEUE_PREFIX = \"_queue_rpc:\";\nconst CALL_TIMEOUT = 3600 * 1000;\n\nvar returnCbs = {},\n replyQueue = \"\",\n DEBUG = false;\n\nfunction dbg(...args:any[]) {\n if (DEBUG) {\n console.log.apply(console, args);\n }\n}\n\nsetInterval(() => {\n // check every hour for expired callbacks\n var removeKeys = [],\n now = new Date().getTime(),\n k,\n timeCreated,\n data;\n for (k in returnCbs) {\n timeCreated = returnCbs[k].date.getTime();\n if (now - timeCreated >= CALL_TIMEOUT) {\n removeKeys.push(k);\n }\n }\n removeKeys.forEach((k) => {\n data = returnCbs[k];\n delete returnCbs[k];\n });\n}, 3600 * 1000);\n\nfunction _parseAction(event) {\n return {\n queue: QUEUE_PREFIX + event,\n };\n}\n\nfunction _errorPrepare(err) {\n if (!err) {\n return null;\n }\n return {\n code: err.code ? err.code : -1,\n msg: err.message,\n data: err.data,\n errtype: err.errtype\n };\n}\n\nexport interface Processors {\n\n}\n\nexport class RPCManager {\n processors:Processors;\n\n constructor() {\n this.processors = {};\n }\n\n private createQueue(action, cb?) {\n let promise = channelManager.getChannel().then((channel) => {\n return new Promise((resolve, reject) => {\n var actionParsed = _parseAction(action);\n channel.assertQueue(actionParsed.queue, {}, (err, attrs) => {\n if (err) return reject(err);\n\n channel.consume(actionParsed.queue, (msg) => {\n var content = JSON.parse(msg.content.toString());\n try {\n dbg(\"Incoming RPC request\", action);\n this.processors[action].listener(content, (err, body) => {\n var response = {\n error: _errorPrepare(err),\n body: typeof body !== \"undefined\" ? body : null\n };\n channel.sendToQueue(msg.properties.replyTo, new Buffer(JSON.stringify(response)), {\n correlationId: msg.properties.correlationId\n });\n\n dbg(\"Incoming RPC request\", action, \" processed! reply to\",\n msg.properties.replyTo);\n });\n }\n catch (ex) {\n console.error(\"ERROR IN rpc processor\\n\", ex.message, ex.stack);\n }\n channel.ack(msg);\n }, {}, (err, res) => {\n if (err) return reject(err);\n resolve(res.consumerTag);\n });\n });\n })\n });\n\n return promiseNodeify(promise, cb);\n };\n\n register(action, cb, registerCb) {\n registerCb = registerCb || (() => null);\n if (this.processors[action]) {\n throw new Error(\"Can't register same action processor twice\");\n }\n var consumerTag;\n async.series([\n (next) => {\n channelManager.connect(() => {\n next();\n });\n },\n (next) => {\n this.createQueue(action, (err, tag) => {\n if (!err) {\n consumerTag = tag;\n }\n next(err);\n });\n }\n ], (err) => {\n if (!err) {\n this.processors[action] = {\n listener: cb,\n consumerTag: consumerTag\n };\n }\n registerCb(err);\n });\n return true;\n };\n\n unregister(action, cb?) {\n let promise = channelManager.getChannel().then((channel) => {\n return new Promise((resolve, reject) => {\n if (!this.processors[action]) {\n process.nextTick(() => resolve(null));\n return;\n }\n channel.cancel(this.processors[action].consumerTag, (err) => {\n if (err) return reject(err);\n\n delete this.processors[action];\n resolve(null);\n });\n })\n });\n\n return promiseNodeify(promise, cb);\n };\n\n call(action, params, cb?) {\n let promise = channelManager.getChannel().then((channel) => {\n return new Promise((resolve, reject) => {\n if (typeof params === \"function\") {\n cb = params;\n params = {};\n }\n var actionParsed = _parseAction(action);\n async.series([\n (next) => {\n channelManager.connect(() => {\n next();\n });\n },\n (next) => {\n if (replyQueue) {\n return next();\n }\n channel.assertQueue(\"\", {\n durable: false,\n autoDelete: true\n }, (err, attrs) => {\n if (err) return reject(err);\n replyQueue = attrs.queue;\n channel.consume(replyQueue, (_msg) => {\n var msg = JSON.parse(_msg.content.toString()),\n correlationId = _msg.properties.correlationId;\n if (returnCbs[correlationId]) {\n dbg(\"RPC Response\", returnCbs[correlationId].action);\n\n var resError = null;\n if (msg.error) {\n resError = new Error(msg.error.msg);\n resError.code = msg.error.code;\n resError.errtype = msg.error.errtype;\n resError.data = msg.error.data;\n }\n var returnCb = returnCbs[correlationId].cb;\n delete returnCbs[correlationId];\n returnCb(resError, msg.body);\n }\n else {\n dbg(\"Obtained reply but unrecognized by correlationId:\", correlationId);\n }\n channel.ack(_msg);\n });\n next();\n });\n },\n () => {\n var correlationId = randomString(48);\n dbg(\"RPC Call\", action, \"wait reply to\", replyQueue);\n returnCbs[correlationId] = {\n date: new Date(),\n cb: cb,\n action: action,\n params: params\n };\n channel.sendToQueue(actionParsed.queue, new Buffer(JSON.stringify(params)), {\n correlationId: correlationId,\n replyTo: replyQueue\n });\n }\n ]);\n })\n });\n\n return promiseNodeify(promise, cb);\n }\n\n static purgeActionQueue(action, cb) {\n return channelManager.getChannel().then((channel) => {\n var actionParsed = _parseAction(action);\n channel.purgeQueue(actionParsed.queue, cb);\n });\n };\n\n}\n\n"]} |