node.js 訪問redis數據庫，pub/sub

    本文主要實現使用node.js連接redis數據庫，pub/sub。當有數據壓入到list中時，pub消息，然後在sub端從list中取出相應的數據

pub.js

var redis = require("redis");
var client = redis.createClient();

client.lpush('usr','test:value');     //將數據壓入到list usr中
client.lpush('like','test1:value1');
client.lpush('dislike','test2:value2');

client.publish("usr", 'new');
client.publish("like", 'test');
client.publish("dislike", 'test2');

sub.js

var redis = require("redis");
var fs = require("fs");

var client1 = redis.createClient();
var client2 = redis.createClient();

var len = 0;
client1.on("message", function (channel, message) {
	getValue(channel);

	/*
    	console.log(channel + ": " + message);
	fs.appendFile("./log.txt",message+'\n',function(e){ //將數據追加到日誌文件中
    		if(e) throw e;
    	});
	*/
});

//var myDate = new Date();  //獲取當前時間
//console.log(myDate);

client1.subscribe("usr");
client1.subscribe("like");
client1.subscribe("dislike");

function getValue(channel)
{
	client2.llen(channel,function(err,reply){ //回調函數形式獲取結果，可以使用redis.print來查看結果
		//console.log(reply);
		var client = redis.createClient();
		for(var i=0;i<reply;i++)
		{
			client.rpop(channel,function(err,reply){
				console.log(reply);
			});
		}
	});
}