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| 1 | +/** |
| 2 | + * 消息队列，简单实现了消息订阅、发布和RPC调用 |
| 3 | + * 也可参考 https://github.com/tjmehta/amqplib-rpc 实现方式 |
| 4 | + */ |
| 5 | + |
| 6 | +var bunnymq = require('bunnymq') |
| 7 | + |
| 8 | +var config = { |
| 9 | + host: 'amqp://localhost', // connect url |
| 10 | + prefetch: 5, // number of fetched messages at once on the channel |
| 11 | + requeue: true, // requeue put back message into the broker if consumer crashes/trigger exception |
| 12 | + timeout: 1000, // time between two reconnect (ms) |
| 13 | + rpcTimeout: 1000 // default timeout for RPC calls. If set to '0' there will be none. |
| 14 | +} |
| 15 | + |
| 16 | +var conn = bunnymq(config) |
| 17 | +var producer = conn.producer |
| 18 | +var consumer = conn.consumer |
| 19 | + |
| 20 | +/** |
| 21 | + * Producer (publisher), can send messages to a named queue. |
| 22 | + */ |
| 23 | +exports.publish = function (queueName, content) { |
| 24 | + producer.produce(queueName, content) |
| 25 | +} |
| 26 | + |
| 27 | +/** |
| 28 | + * Consumer (subscriber), can handle messages from a named queue. |
| 29 | + */ |
| 30 | +exports.subscribe = function (queueName, callback) { |
| 31 | + consumer.consume(queueName, callback) |
| 32 | +} |
| 33 | + |
| 34 | +/** |
| 35 | + * RPC invoking |
| 36 | + * @param {String} queueName 队列名 |
| 37 | + * @param {Object} content 传递的参数 |
| 38 | + * @param {Function} callback 回调函数，参数为返回值 |
| 39 | + */ |
| 40 | +exports.rpcCall = function (queueName, content, callback) { |
| 41 | + producer.produce(queueName, content, { rpc: true }).then(callback) |
| 42 | +} |
| 43 | + |
| 44 | +/** |
| 45 | + * RPC provider |
| 46 | + * @param {String} queueName 队列名 |
| 47 | + * @param {Function} handler 处理函数，其返回值可以是普通数据类型或Promise对象 |
| 48 | + */ |
| 49 | +exports.rpcReceive = function (queueName, handler) { |
| 50 | + consumer.consume(queueName, handler) |
| 51 | +} |
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