first commit

NodeServer/redis/index.js

@@ -0,0 +1,45 @@
+const redis = require("redis");
+const BroadcastChannel = require("../BroadcastChannel");
+
+class Redis {
+  constructor() {
+    this.client = redis.createClient({
+      host:'127.0.0.1',
+      port:'6379',
+      ttl: 5*60*1000
+    });
+
+    this.client.on("error", function(error) {
+      console.error(error);
+    });
+
+    this.client.send_command('config', ['set', 'notify-keyspace-events', 'Ex'], this.SubscribeExpired);
+  }
+
+  async get(key) {
+    return new Promise((resolve)=>{
+      this.client.get(key, (err,res) => resolve(res));
+    })
+  }
+
+  set(key, value="") {
+    this.client.set(key, value);
+    // 设置key的过期时间60秒（其实也就是二维码的有效时间）
+    this.client.expire(key, 60)
+  }
+
+  SubscribeExpired(e, r) {
+    let sub = redis.createClient(6379);
+    const expired_subKey = '__keyevent@0__:expired';
+    sub.subscribe(expired_subKey, function () {
+      sub.on('message', function (chan, msg) {
+        console.log(`二维码：${msg} 已超时过期... `);
+        // 二维码失效，通过 BroadcastChannel 通知 routes/socket.js
+        BroadcastChannel.SubscribeExpired.postMessage(msg);
+      });
+    })
+  }
+}
+
+module.exports = new Redis();
+