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esproxy.go
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esproxy.go
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package main
import (
"bytes"
"flag"
"fmt"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promhttp"
"io"
"io/ioutil"
"log"
"net/http"
"os"
"strconv"
"strings"
"time"
)
var debugLog,errorLog,infoLog *log.Logger
var ProxyUrl1,ProxyUrl2,Port string
var RetryTime int
var TimeOut int64
var help bool
var (
Proxy_receiver_total = prometheus.NewCounterVec(prometheus.CounterOpts{
Name: "proxy_receiver_total",
Help: "count proxy receiver request",
},
[]string {"Server","Method","Uri"},
)
//model.AlertsFromCounter.WithLabelValues("from","to","message","level","host","index").Add(1)
Proxy_send_success_total = prometheus.NewCounterVec(prometheus.CounterOpts{
Name: "proxy_send_success_total",
Help: "count proxy send success request",
},
[]string {"Server","Method","Uri"},
)
//model.AlertToCounter.WithLabelValues("to","message").Add(1)
Proxy_send_fail_total = prometheus.NewCounterVec(prometheus.CounterOpts{
Name: "proxy_send_fail_total",
Help: "count proxy fail request",
},
[]string {"Server","Method","Uri"},
)
)
func init() {
flag.StringVar(&ProxyUrl1, "hosta", "http://10.25.60.212:9200", "指定默认代理的目标`http://10.25.60.212:9200`")
flag.StringVar(&ProxyUrl2, "hostb", "http://10.25.60.213:9200", "指定流量镜像的目标`http://10.25.60.213:9200`")
flag.StringVar(&Port, "p", "9200", "代理服务监听端口`9200`")
flag.IntVar(&RetryTime, "r", 3, "`后端代理失败重试次数`")
flag.Int64Var(&TimeOut, "t", 30, "`后端代理超时时间(秒)`")
flag.BoolVar(&help,"h", false, "显示帮助")
flag.Usage = usage
}
func usage() {
fmt.Fprintf(os.Stderr, `Version 0.1 If you need help contact [email protected]
Usage: esproxy [-h] [-hosta ProxyTarget] [-hostb CopyTarget] [-p Port] [-r RetryTime] [-t TimeOut]
Example：esproxy -hosta http://10.25.60.212:9200 -hostb http://10.25.60.213:9200 -p 9200 -r 3 -t 30
Options:
`)
flag.PrintDefaults()
}
func main() {
flag.Parse()
if help {
flag.Usage()
return
}
infoFile, err := os.OpenFile("log/proxy.log", os.O_WRONLY | os.O_CREATE | os.O_APPEND, 0644)
if err != nil {
fmt.Println("[ "+time.Now().Format("2006/01/02 15:04:05")+" ]",err.Error())
}
errorFile, err := os.OpenFile("log/proxy-error.log", os.O_WRONLY | os.O_CREATE | os.O_APPEND, 0644)
if err != nil {
fmt.Println("[ "+time.Now().Format("2006/01/02 15:04:05")+" ]",err.Error())
}
debugLog = log.New(infoFile, "[DEBUG] [ ", log.Ldate|log.Ltime )
errorLog = log.New(errorFile, "[ERROR] [ ", log.Ldate|log.Ltime)
infoLog = log.New(infoFile, "[INFO] [ ", log.Ldate|log.Ltime)
prometheus.MustRegister(Proxy_receiver_total,Proxy_send_success_total,Proxy_send_fail_total)
http.HandleFunc("/", handler)
http.Handle("/app/metrics", promhttp.Handler())
fmt.Println("[ "+time.Now().Format("2006/01/02 15:04:05")+" ] Start Elasticsearch Proxy On 0.0.0.0:"+Port)
http.ListenAndServe(":"+Port, nil)
os.Exit(0)
}
func handler(w http.ResponseWriter, r *http.Request) {
//var tr *http.Transport
//tr = &http.Transport{
// TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
// Proxy: proxy,
//}
//超时时间设置
HttpTimeOut:=time.Duration(TimeOut)*time.Second
client := &http.Client{Timeout:HttpTimeOut}
HttpBody,_:=ioutil.ReadAll(r.Body)
//缓存request body
ReqBody1:=ioutil.NopCloser(bytes.NewBuffer(HttpBody))
ReqBody2:=ioutil.NopCloser(bytes.NewBuffer(HttpBody))
//记录请求内容
Proxy_receiver_total.WithLabelValues("127.0.0.1:9200",r.Method,r.RequestURI).Add(1)
infoLog.Println("] [Server] 127.0.0.1:9200 [Method] "+r.Method," [Uri] "+r.RequestURI,"[HttpBody] "+strings.Replace(string(HttpBody),"\n","",-1))
//异步转发给第二个ES
infoLog.Println("] [Server] "+ProxyUrl2, "[Method] "+r.Method, " [Uri] "+r.RequestURI, "[HttpBody] "+strings.Replace(string(HttpBody), "\n", "", -1))
channel := make(chan int)
go func(ch chan int) {
for Retry:=0; Retry<RetryTime+1;Retry++ {
req2, err := http.NewRequest(r.Method,ProxyUrl2+r.RequestURI,ReqBody2)
req2.Header=r.Header
_, err = client.Do(req2)
if err != nil {
Proxy_send_fail_total.WithLabelValues(ProxyUrl2,r.Method,r.RequestURI).Add(1)
infoLog.Println("] [Server] "+ProxyUrl2,"[Method] "+r.Method," [Uri] "+r.RequestURI,err.Error())
if Retry == RetryTime {
errorLog.Println("] [Server] "+ProxyUrl2, "[Method] "+r.Method, " [Uri] "+r.RequestURI, "[HttpBody] "+strings.Replace(string(HttpBody), "\n", "", -1))
break
}
debugLog.Println("] [Server] "+ProxyUrl2,"[Method] "+r.Method," [Uri] "+r.RequestURI," retry time "+strconv.Itoa(Retry+1))
}else {
Proxy_send_success_total.WithLabelValues(ProxyUrl2,r.Method,r.RequestURI).Add(1)
break
}
defer req2.Body.Close()
}
ch <- 1
<- channel
}(channel)
//请求第一个ES
var resp = &http.Response{}
infoLog.Println("] [Server] "+ProxyUrl1, "[Method] "+r.Method, " [Uri] "+r.RequestURI, "[HttpBody] "+strings.Replace(string(HttpBody), "\n", "", -1))
for Retry:=0; Retry<RetryTime+1;Retry++ {
req, err := http.NewRequest(r.Method,ProxyUrl1+r.RequestURI,ReqBody1)
req.Header=r.Header
resp, err = client.Do(req)
if err != nil {
Proxy_send_fail_total.WithLabelValues(ProxyUrl1,r.Method,r.RequestURI).Add(1)
infoLog.Println("] [Server] "+ProxyUrl1,"[Method] "+r.Method," [Uri] "+r.RequestURI,err.Error())
if Retry == RetryTime {
http.NotFound(w, r)
errorLog.Println("] [Server] "+ProxyUrl1, "[Method] "+r.Method, " [Uri] "+r.RequestURI, "[HttpBody] "+strings.Replace(string(HttpBody), "\n", "", -1))
return
}
debugLog.Println("] [Server] "+ProxyUrl1,"[Method] "+r.Method," [Uri] "+r.RequestURI," retry time "+strconv.Itoa(Retry+1))
}else {
Proxy_send_success_total.WithLabelValues(ProxyUrl1,r.Method,r.RequestURI).Add(1)
break
}
defer req.Body.Close()
}
//处理返回
data, err := ioutil.ReadAll(resp.Body)
if err != nil && err != io.EOF {
http.NotFound(w, r)
return
}
for i, j := range resp.Header {
for _, k := range j {
w.Header().Add(i, k)
}
}
for _, c := range resp.Cookies() {
w.Header().Add("Set-Cookie", c.Raw)
}
_, ok := resp.Header["Content-Length"]
if !ok && resp.ContentLength > 0 {
w.Header().Add("Content-Length", fmt.Sprint(resp.ContentLength))
}
w.WriteHeader(resp.StatusCode)
w.Write(data)
}