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main.go
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main.go
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package main
import (
"flag"
"fmt"
"net/http"
"net/http/httputil"
"net/url"
)
const (
grafanaString = "grafana.example.com"
defaultRemoteHost = "localhost:30080"
)
var (
port string
service string
targetHost string
)
func init() {
flag.StringVar(&service, "svc", grafanaString, "target service")
flag.StringVar(&port, "port", "8080", "proxy port")
flag.StringVar(&targetHost, "host", defaultRemoteHost, "targeted host-port")
flag.Parse()
}
func main() {
fmt.Printf("reverse-proxy running on: %s\n", getListenAddress())
proxy := newSingleHostReverseProxy(&url.URL{
Scheme: "http",
Host: targetHost,
})
if err := http.ListenAndServe(getListenAddress(), proxy); err != nil {
panic(err)
}
}
func newSingleHostReverseProxy(target *url.URL) *httputil.ReverseProxy {
proxy := httputil.NewSingleHostReverseProxy(target)
targetQuery := target.RawQuery
director := func(req *http.Request) {
req.URL.Scheme = target.Scheme
req.URL.Host = target.Host
req.Host = service
if targetQuery == "" || req.URL.RawQuery == "" {
req.URL.RawQuery = targetQuery + req.URL.RawQuery
} else {
req.URL.RawQuery = targetQuery + "&" + req.URL.RawQuery
}
req.Header.Set("Host", service)
}
proxy.Director = director
return proxy
}
// getListenAddress get the port to listen on
func getListenAddress() string {
return ":" + port
}