压测工具ab不能统计http请求的错误情况，包括http状态码错误和响应正文的错误关键字。
所以加层代理用于统计http错误情况，重在统计错误情况，而不是代理的性能，主要用于功能接口的测试，比如测试一下请求多少次接口会返回空数据。
被认为是错误的情况：
1、非200状态码
2、响应正文里不包含表示正确关键字
3、响应正文里包含表示错误关键字
编译方式：
go build go_ab_proxy.go
启动方式：
./go_ab_proxy
./go_ab_proxy -okstr 'code":"0'
./go_ab_proxy -failstr error
测试方式：
ab -c 2 -n 10 -X 127.0.0.1:9090 'http://www.baidu.com/'
curl -x 127.0.0.1:9090 'http://www.baidu.com/'
查看错误统计：
ctrl-c或kill结束进程时显示统计结果。
golang代码如下：
go_ab_proxy.go
package mainimport ("bytes""flag""fmt""net/http""net/http/httputil""os""os/signal""strings""sync/atomic""syscall"
)var (successCount int32failCount int32okStr = flag.String("okstr", "", "indicate ok string")failStr = flag.String("failstr", "", "indicate fail string")
)func main() {flag.Parse()if *okStr != "" && *failStr != "" {fmt.Printf("-okstr and -failstr only one can be used\n")return}http.HandleFunc("/", middleware(func(w http.ResponseWriter, r *http.Request) {proxy := httputil.NewSingleHostReverseProxy(r.URL)proxy.ServeHTTP(w, r)}))go installSignal()err := http.ListenAndServe(":9090", nil)if err != nil {fmt.Printf("proxy server start fail, %v\n", err)return}
}func middleware(handler http.HandlerFunc) http.HandlerFunc {return func(response http.ResponseWriter, request *http.Request) {responseWrapper := &ResponseWithRecorder{ResponseWriter: response,StatusCode: http.StatusOK,Body: bytes.Buffer{},}handler(responseWrapper, request)if responseWrapper.StatusCode != http.StatusOK {atomic.AddInt32(&failCount, 1)} else {if *okStr == "" && *failStr == "" {atomic.AddInt32(&successCount, 1)return}resBody := string(responseWrapper.Body.Bytes())if *okStr != "" && !strings.Contains(resBody, *okStr) {atomic.AddInt32(&failCount, 1)return} else if *failStr != "" && strings.Contains(resBody, *failStr) {atomic.AddInt32(&failCount, 1)return}atomic.AddInt32(&successCount, 1)}}
}func installSignal() {sigs := make(chan os.Signal, 1)signal.Notify(sigs, syscall.SIGINT, syscall.SIGTERM)go func() {<-sigsfmt.Printf("successCount=%d, failCount=%d\n", atomic.LoadInt32(&successCount), atomic.LoadInt32(&failCount))os.Exit(0)}()
}type ResponseWithRecorder struct {http.ResponseWriterStatusCode intBody bytes.Buffer
}func (rec *ResponseWithRecorder) WriteHeader(statusCode int) {rec.ResponseWriter.WriteHeader(statusCode)rec.StatusCode = statusCode
}func (rec *ResponseWithRecorder) Write(d []byte) (n int, err error) {n, err = rec.ResponseWriter.Write(d)if err != nil {return}rec.Body.Write(d)return
}
--end--
)
)
