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node-que

v1.0.2

Published

一个支持分布式的任务队列

Downloads

11

Readme

que

Build Status Coverage Status

简介

一个基于redis的任务队列,支持分布式(基于http),可横向拓展,错误警告与重试。

benchmark

在自己的最低配阿里云上(单核CPU,1GB内存,1M带宽),利用ab发起10k并发任务请求(script):

ab -n 10000 -c 10000 -p 'post.txt' -T 'application/json' http://127.0.0.1:8083/task
#output
Server Software:
Server Hostname:        127.0.0.1
Server Port:            8083

Document Path:          /task
Document Length:        22 bytes

Concurrency Level:      10000
Time taken for tests:   13.323 seconds
Complete requests:      10000
Failed requests:        0
Write errors:           0
Total transferred:      1640000 bytes
Total POSTed:           1594670
HTML transferred:       220000 bytes
Requests per second:    750.58 [#/sec] (mean)
Time per request:       13322.956 [ms] (mean)
Time per request:       1.332 [ms] (mean, across all concurrent requests)
Transfer rate:          120.21 [Kbytes/sec] received
                        116.89 kb/s sent
                        237.10 kb/s total

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        0 1653 2119.5    722    7005
Processing:   100  863 906.1    470    6949
Waiting:       94  863 906.1    469    6949
Total:        254 2517 2139.3   1797   11185

Percentage of the requests served within a certain time (ms)
  50%   1797
  66%   3245
  75%   3371
  80%   3438
  90%   7294
  95%   7513
  98%   7627
  99%   7952
 100%  11185 (longest request)

使用

安装

直接通过npm:

Que使用了ES6的相关特性,请在运行时加上harmony选项

npm install node-que --save

例子

#单机模式
Que = require 'node-que'

queue = new Que 'myTaskQue'
queue.on 'done', (err, result) ->
  if err then console.error err
  console.log "done! result: #{result}"

handler = (taskData) ->
  new Promise (resolve, reject) ->
    #对传入数据进行自定义操作...
    resolve taskData.data
    
#指定处理函数
queue.processor handler

for i in [0..10]
  queue.push {data: 'myData'}
#分布模式
#master,调度分配节点
Que = require 'node-que'
request = require 'superagent'

masterQue = new Que 'myTaskQue'
masterQue.master(['http://localhost:8081', 'http://localhost:8082']).listen 8083
masterQue.on 'done', (err, result) ->
  if err then console.error err
  console.log "done! result: #{result}"

#salve,工作节点
handler = (taskData) ->
  new Promise (resolve, reject) ->
    #对传入数据进行自定义操作...
    resolve taskData.data

salveQue1 = new Que 'myTaskQue'
salveQue2 = new Que 'myTaskQue'
salveQue1.salve(handler).listen 8081
salveQue2.salve(handler).listen 8082

#从脚本中向队列推入数据
for i in [0..10]
  masterQue.push {data: 'by script'}
#通过http api向队列推入数据
request
  .post 'http://localhost:8083/task'
  .send {data: 'by http api'}
  .set 'Accept', 'application/json'
  .end (err, res) ->
    if err then console.error err
    console.log res.status

API

new Que(queueName)

queueName: 赋予任务队列的名字,用于区分不同队列,在分布模式下,master/salve队列的名字必须相同

生成一个Que实例

push(taskData)

taskData: 待处理数据

将待处理数据推入任务队列(redis list),暂只支持本地redis

processor(handler)

handler(taskData): 数据的处理函数,参数既是队列中的一个待处理数据,必须返回一个Promise实例

指定数据的处理函数

错误处理与重试

队列中的每个任务在处理出现错误时,Que都会对其进行重试,若重试5次仍然未成功,则放弃这个任务

getNumberOfProcessed()

获取队列中已经处理完成的任务数

getNumberOfRejected()

获取队列中重试5次仍未成功后被放弃的任务数

master(salves).listen(port)

salves: 分布模式中,所有salve工作节点的地址数组

port: 此master分配调度节点的监听端口

启动分布模式,将此Que作为master节点,并指定所有salves

salve(handler).listen(port)

handler(taskData): 数据的处理函数,参数既是队列中的一个待处理数据,必须返回一个Promise实例

port: 此salve工作节点的监听端口

stop()

关闭队列

http API

POST /task

将待处理数据推入处理队列

GET /task/processed

获取队列中已经处理完成的任务数

GET /task/rejected

获取队列中重试5次仍未成功后被放弃的任务数