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September 11, 2019 08:54
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ioredis实现Redis Keyspace Notifications
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| // 参考文献 | |
| // https://redis.io/topics/notifications | |
| // https://medium.com/@micah1powell/using-redis-keyspace-notifications-for-a-reminder-service-with-node-c05047befec3 | |
| const Redis = require('ioredis'); | |
| //#region Redis测试 | |
| // subscriber | |
| let RedisSubTester = new Redis({ | |
| port: 6379, // Redis port | |
| host: "127.0.0.1", // Redis host | |
| db: 0 | |
| }); | |
| // publisher | |
| let RedisPubTester = new Redis({ | |
| port: 6379, // Redis port | |
| host: "127.0.0.1", // Redis host | |
| db: 0 | |
| }); | |
| // event handler | |
| let RedisEventsHandler = new Redis({ | |
| port: 6379, // Redis port | |
| host: "127.0.0.1", // Redis host | |
| db: 0 | |
| }); | |
| RedisEventsHandler.on('ready', function () { | |
| // https://redis.io/topics/notifications#configuration | |
| RedisEventsHandler.config("SET", "notify-keyspace-events", "KEA"); | |
| RedisEventsHandler.setex('myKey', 5, 'Hello World'); | |
| // RedisEventsHandler.set('myKey', 'Hello World', 'Ex', 5); | |
| }); | |
| let PubSub = { | |
| publish(channel, message) { | |
| RedisPubTester.publish(channel, message); | |
| }, | |
| subscribe(channel) { | |
| RedisSubTester.subscribe(channel); | |
| }, | |
| psubscribe(channel) { | |
| RedisSubTester.psubscribe(channel); | |
| }, | |
| on(event, callback) { | |
| RedisSubTester.on(event, (channel, message) => { | |
| callback(channel, message); | |
| }); | |
| } | |
| }; | |
| // PubSub.subscribe("__keyevent@0__:expired"); // normal subscriber | |
| PubSub.psubscribe("__key*__:*"); // pattern subscriber | |
| PubSub.psubscribe("news"); | |
| PubSub.psubscribe("music"); | |
| PubSub.publish("news", "Hello world!"); | |
| PubSub.publish("music", "Hello again!"); | |
| PubSub.on("message", async (channel, message) => { | |
| // Handle event | |
| console.log(`channel: ${channel}, message: ${message}`); | |
| }); | |
| PubSub.on("pmessage", async (pattern, channel, message) => { | |
| // Handle event | |
| console.log(`pattern: ${pattern}, channel: ${channel}, message: ${message}`); | |
| }); | |
| //#endregion |
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