nginx+lua+redis

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在使用nginx+lua+redis做一个系统，来支撑高并发高访问量的应用。开发时突然想到golang是不是也可以达到同样的效果。于是写了个简单的代码对比一下。

具体就不多做介绍了，网上很多关于nginx+lua+redis构建高并发应用的介绍。我使用的是openresty+lua+redis。

先贴下测试结果，机器就是2013年新出的低配air——（1.3 GHz Intel Core i5， 4 GB 1600 MHz DDR3）, 命令：

ab -n 1000 -c 100 http://localhost:8880/

openresty+lua+redis:Concurrency Level: 100Time taken for tests: 0.458 secondsComplete requests: 1000Failed requests: 0Total transferred: 689000 bytesHTML transferred: 533000 bytesRequests per second: 2183.67 [#/sec] (mean)Time per request: 45.794 [ms] (mean)Time per request: 0.458 [ms] (mean, across all concurrent requests)Transfer rate: 1469.29 [Kbytes/sec] receivedgolang+redis:Concurrency Level: 100Time taken for tests: 0.503 secondsComplete requests: 1000Failed requests: 0Total transferred: 650000 bytesHTML transferred: 532000 bytesRequests per second: 1988.22 [#/sec] (mean)Time per request: 50.296 [ms] (mean)Time per request: 0.503 [ms] (mean, across all concurrent requests)Transfer rate: 1262.05 [Kbytes/sec] receivedlua代码：

— redis 配置localparams={host=‘127.0.0.1′,port=6379,}localred=redis:new()localok,err=red:connect(params.host,params.port)ifnotokthenngx.say(“failed to connect: “,err)returnendlocalposition_key=ngx.var.position_keylocalcontent=red:get(position_key)ngx.print(content)golang代码 ：

packagemainimport(“fmt”“github.com/garyburd/redigo/redis”“log”“net/http”“time”)funcgetConn()(redis.Conn,error){conn,err:=redis.DialTimeout(“tcp”,“:6379”,0,1*time.Second,1*time.Second)iferr!=nil{fmt.Println(err)}returnconn,err}funcindexHandler(whttp.ResponseWriter,r*http.Request){conn,err:=getConn()iferr!=nil{http.Error(w,err.Error(),http.StatusInternalServerError)return}result,err:=conn.Do(“get”,“content_1”)iferr!=nil{http.Error(w,err.Error(),http.StatusInternalServerError)return}fmt.Fprintf(w,“Hello, %q”,result)}funcmain(){http.HandleFunc(“/”,indexHandler)err:=http.ListenAndServe(“:8880”,nil)iferr!=nil{log.Fatal(“ListenAndServe: “,err.Error())}}经过多次压测之后发现，nginx + lua + redis的组合确实高效，golang + redis的方案其实也差不了多少。相对于整个系统从开发到部署的方式来说，golang可能更合适，更符合开发的习惯，毕竟nginx + lua 这种方案开发和测试都略显别扭。

补充连接池的使用和测试结果

上次测试完之后，觉得这个代码还有提高的空间，于是查了下怎么在golang中使用redis连接池（其实就是redigo的使用），还有lua中怎么使用redis连接池（其实就是rest.redis的使用）。

先上结果:

openresty + lua + redisConcurrency Level: 100Time taken for tests: 0.284 secondsComplete requests: 1000Failed requests: 0Total transferred: 687000 bytesHTML transferred: 531000 bytesRequests per second: 3522.03 [#/sec] (mean)Time per request: 28.393 [ms] (mean)Time per request: 0.284 [ms] (mean, across all concurrent requests)Transfer rate: 2362.93 [Kbytes/sec] received

再看golang:

golang + redisConcurrency Level: 100Time taken for tests: 0.327 secondsComplete requests: 1000Failed requests: 0Total transferred: 650000 bytesHTML transferred: 532000 bytesRequests per second: 3058.52 [#/sec] (mean)Time per request: 32.696 [ms] (mean)Time per request: 0.327 [ms] (mean, across all concurrent requests)Transfer rate: 1941.44 [Kbytes/sec] received

lua代码：

— redis 配置localparams={host=‘127.0.0.1′,port=6379,}localred=redis:new()localok,err=red:connect(params.host,params.port)ifnotokthenngx.say(“failed to connect: “,err)returnendlocalposition_key=ngx.var.position_keylocalcontent=red:get(position_key)ngx.print(content)localok,err=red:set_keepalive(10000,100)ifnotokthenngx.say(“failed to set keepalive: “,err)returnend

golang代码:

packagemainimport(“flag”“fmt”“github.com/garyburd/redigo/redis”“log”“net/http”“runtime”“time”)var(pool*redis.PoolredisServer=flag.String(“redisServer”,“:6379”,“”))funcindexHandler(whttp.ResponseWriter,r*http.Request){t0:=time.Now()conn:=pool.Get()t1:=time.Now()fmt.Printf(“The call took %v to run.\n”,t1.Sub(t0))deferconn.Close()result,err:=conn.Do(“get”,“content_1”)iferr!=nil{http.Error(w,err.Error(),http.StatusInternalServerError)return}fmt.Fprintf(w,“Hello, %q”,result)}funcnewPool(serverstring)*redis.Pool{return&redis.Pool{MaxIdle:3,IdleTimeout:240*time.Second,Dial:func()(redis.Conn,error){c,err:=redis.Dial(“tcp”,server)iferr!=nil{returnnil,err}returnc,err},TestOnBorrow:func(credis.Conn,ttime.Time)error{_,err:=c.Do(“PING”)returnerr},}}funcmain(){runtime.GOMAXPROCS(runtime.NumCPU())flag.Parse()pool=newPool(*redisServer)http.HandleFunc(“/”,indexHandler)err:=http.ListenAndServe(“:8880”,nil)iferr!=nil{log.Fatal(“ListenAndServe: “,err.Error())}}

golang中除了添加了线程池，还设置了cpu核数。

不过这个测试并不十分严谨，redis，nginx，golang http server，ab压测都在一台机器，相互之间会有影响。有兴趣的可以自己分开部署测试下。

以上就介绍了nginx+lua+redis，包括了方面的内容，希望对PHP教程有兴趣的朋友有所帮助。

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