我试图让this包工作。
redis版本：稳定4.0.6
我像这样连接Redis，那里没有问题。
pubsub.js
var viz = svg.selectAll("path")
.data(data)
.enter()
.append("path")
.attr({
d: function(d) {
return lineFun(d.arr)
},
"stroke": "purple",
"stroke-width": 2,
"fill": "none",
"class":"line"
})
.style("stroke",function(){
return d.color=color(d.arr);
})
.attr("transform", "translate(48, " + 10 +")")
;
}
d3.json("sample-data.json",function(error,data){
//check the file loaded properly
if (error) { //is there an error?
console.log(error); //if so, log it to the console
} else { //If not we're golden!
//Now show me the money!
ds=data; //put the data in the global var
}
data.forEach(function(jsonData){
var lineData = d3.range(0, jsonData.spend, 100)
.map(x => [x, (jsonData.alpha * (1 - Math.pow(2.71828, (-jsonData.beta * x))))] );
/* console.log("this is the data:",lineData);*/
//i think line date returns an array with each item in it also an array of 2 items
var arr = [];
for (var i = 0; i < lineData.length; i++) {
arr.push({
x: lineData[i][0],
y: lineData[i][1]
});
}
jsonData.arr = arr;
console.log(jsonData);
});
buildLine(data);
});
启动Node.js应用程序后，我可以看到＆＃34; connected＆＃34;在控制台上并执行操作，我已经检查过了。
我的var redis = require("redis");
var psRedis = redis.createClient();
psRedis.auth("mypasswordishere", function (callback) {
console.log("connected");
});
module.exports.psRedis = psRedis;
文件位于下方。
test.js
test.js但是，当我访问var express = require('express');
var router = express.Router();
var path = require("path");
var bodyParser = require('body-parser');
var async1 = require("async");
var client = require("../databases/redis/redis.js").client;
var RedisSMQ = require("rsmq");
var psRedis = require("./realtime/operations/pubsub").psRedis;
var rsmq = new RedisSMQ({client: psRedis});
rsmq.createQueue({qname: "myqueue"}, function (err, resp) {
if (resp === 1) {
console.log("queue created");
}
});
rsmq.receiveMessage({qname: "myqueue"}, function (err, resp) {
if (resp) {
console.log(resp);
}
});
router.get('/pubsubTest', function (req, res, next) {
async1.waterfall([
function (callback) {
rsmq.sendMessage({qname: "myqueue", message: "Hello World 1"}, function (err, resp) {
if (resp) {
console.log("Message sent. ID:", resp);
}
});
callback(null, 'done!');
}
], function (err, result) {
res.sendStatus(200);
});
});
module.exports = router;
时，控制台上只会显示消息ID。
发送消息。 ID：exb289xu0i7IaQPEy1wA4O7xQQ6n0CAp
如果我重新启动我的Node.js应用程序，我会看到下面的结果，这是预期的。为什么不立即出现？
/pubsubTest谢谢。
答案 0 :(得分：2)
receiveMessage不会“触发”。您发送邮件后，需要后来称呼它。
您正在寻找的是rsmq提供的实时选项。
var rsmq = new RedisSMQ({client: psRedis}, ns: "rsmq",realtime :true});
现在，通过sendMessage添加到队列中的每条新消息中，都会向rsmq:rt:{qname}发送内容为{msg}的发布消息。就您而言，sendMessage将发出一个事件，即rsmq:rt:myqueue
有两种解决方案，都将使用事件rsmq:rt:myqueue
1。第一个将使用redis客户端，该客户端可以使用redis提供的subscribe方法订阅此发布的事件，以实现PUB / SUB。
var redis = require('redis');
const subscribe = redis.createClient();
subscribe.subscribe('rsmq:rt:myqueue');
subscribe.on('message', function(msg) { //msg=>'rsmq:rt:myqueue'
rsmq.receiveMessage({qname: "myqueue"}, function (err, resp) {
if (resp) {
console.log(resp);
}
});
});
整个代码如下：
var express = require('express');
var router = express.Router();
var path = require("path");
var bodyParser = require('body-parser');
var async1 = require("async");
var client = require("../databases/redis/redis.js").client;
var psRedis = require("./realtime/operations/pubsub").psRedis;
var rsmq = new RedisSMQ({client: psRedis}, ns: "rsmq",realtime :true});
rsmq.createQueue({qname: "myqueue"}, function (err, resp) {
if (resp === 1) {
console.log("queue created");
}
});
const subscribe = redis.createClient( 6379,"127.0.0.1"); //creating new
worker and pass your credentials
subscribe.subscribe('rsmq:rt:myqueue');
subscribe.on('message', function(msg) { //msg=>'rsmq:rt:myqueue'
rsmq.receiveMessage({qname: "myqueue"}, function (err, resp) {
if (resp) {
console.log(resp);
}
});
});
router.get('/pubsubTest', function (req, res, next) {
async1.waterfall([
function (callback) {
rsmq.sendMessage({qname: "myqueue", message: "Hello World 1"},
function (err,
resp) {
if (resp) {
console.log("Message sent. ID:", resp);
}});
callback(null, 'done!');
}
], function (err, result) {
res.sendStatus(200);
});
});
module.exports = router;
2。第二种解决方法是使用rsmq-worker，它将为您提供一个 消息 事件，您可以使用.on方法收听该事件。
var RSMQWorker = require( "rsmq-worker" );
var worker = new RSMQWorker( "myqueue" ,{interval:.1}); // this worker
will poll the queue every .1 second.
worker.on( "message", function( message, next, msgid ){
if(message){
console.log(message);
}
next();
});
worker.start();
整个代码如下：
var express = require('express');
var router = express.Router();
var path = require("path");
var bodyParser = require('body-parser');
var async1 = require("async");
var client = require("../databases/redis/redis.js").client;
var psRedis = require("./realtime/operations/pubsub").psRedis;
var rsmq = new RedisSMQ({client: psRedis},{ ns: "rsmq",realtime :true});
rsmq.createQueue({qname: "myqueue"}, function (err, resp) {
if (resp === 1) {
console.log("queue created");
}
});
var RSMQWorker = require( "rsmq-worker" );
var worker = new RSMQWorker( "myqueue" ,{interval:.1});
worker.on( "message", function( message, next, msgid ){
if(message){
console.log(message);
}
next();
});
// optional error listeners
worker.on('error', function( err, msg ){
console.log( "ERROR", err, msg.id );
});
worker.on('exceeded', function( msg ){
console.log( "EXCEEDED", msg.id );
});
worker.on('timeout', function( msg ){
console.log( "TIMEOUT", msg.id, msg.rc );
});
worker.start();
router.get('/pubsubTest', function (req, res, next) {
async1.waterfall([
function (callback) {
rsmq.sendMessage({qname: "myqueue", message: "Hello World1"}
,function (err, resp) {
if (resp) {
console.log("Message sent. ID:", resp);
}});
callback(null, 'done!');
}
], function (err, result) {
res.sendStatus(200);
});
});
module.exports = router;
注意：在第一个解决方案中，您将需要使用deleteMessage删除从队列中收到的消息，或者也可以使用popMessage来接收最后一条消息并为您删除。如果您不删除该消息，则将再次获得所有消息，直到该特定消息的超时时间结束为止。
由于这个原因，我更喜欢使用第二种解决方案，rsmq会为您处理这些事情，并且您还可以提供自己的轮询间隔