Acara redis keyspace tidak diaktifkan

Anda lupa berlangganan klien pelanggan ke saluran tertentu. Selanjutnya, jika Anda ingin menonton semua acara, Anda perlu menggunakan langganan berbasis pola.

Anda mungkin ingin melakukan sesuatu seperti ini (belum diuji):

subscriber.on("pmessage", function (pattern, channel, message) {
    console.log("("+  pattern +")" + " client received message on " + channel + ": " + message);
    switch (channel) {
        // blah blah blah
        // ...
    }
});
subscriber.psubscribe(''__key*__:*')

Lihat informasi selengkapnya dalam dokumentasi Redis, dan dalam contoh node_redis.

Pembaruan:

Berikut adalah contoh untuk menggambarkan perbedaan antara berlangganan saluran dan berlangganan pola. Penanganan kesalahan yang tepat dihilangkan demi singkatnya.

var redis = require("redis");

var client = redis.createClient('6379','127.0.0.1');
var subscriber1 = redis.createClient('6379','127.0.0.1');
var subscriber2 = redis.createClient('6379','127.0.0.1');

// First subscriber listens only to events occurring for key mykey
function S1(next) {
    subscriber1.on('message', function(channel, msg) {
        console.log( "S1: received on "+channel+" event "+msg )
    });
    subscriber1.subscribe( "[email protected]__:mykey", function (err) {
        next();
    });
}

// Second subscriber listens to events occuring for ALL keys
function S2(next) {
    subscriber2.on('pmessage', function(pattern,channel, msg) {
        console.log( "S2: received on "+channel+" event "+msg )
    });
    subscriber2.psubscribe( "[email protected]__:*", function (err) {
        next();
    });
}

// Do something with keys mykey and anotherkey
function do_something() {
    client.set("mykey","example", function( err ) {
        client.set("mykey", "another example", function( err ) {
            client.del("mykey", function( err ) {
                client.set("anotherkey","example", function( err ) {
                    client.del("anotherkey");
                });
            });
        });
    });
}

// Here we go
S1( function () {
    S2( function () {
        do_something();
    });
});

Hasil dari script ini adalah:

S1: received on [email protected]__:mykey event set
S2: received on [email protected]__:mykey event set
S2: received on [email protected]__:mykey event set
S1: received on [email protected]__:mykey event set
S1: received on [email protected]__:mykey event del
S2: received on [email protected]__:mykey event del
S2: received on [email protected]__:anotherkey event set
S2: received on [email protected]__:anotherkey event del

Anda dapat melihat bahwa pelanggan pertama hanya menerima acara untuk kunci saya, sedangkan pelanggan kedua menerima acara untuk semua kunci.