panel apperance, added experimental tcp/udp proxy support, slight performance improvement for http proxy

src/go-proxy/http_proxy.go

@@ -0,0 +1,66 @@
+package main
+
+import (
+	"fmt"
+	"log"
+	"net"
+	"net/http"
+	"net/http/httputil"
+	"net/url"
+	"time"
+)
+
+type HTTPRoute struct {
+	Url   *url.URL
+	Path  string
+	Proxy *httputil.ReverseProxy
+}
+
+// TODO: default + per proxy
+var transport = &http.Transport{
+	Proxy: http.ProxyFromEnvironment,
+	DialContext: (&net.Dialer{
+		Timeout:   60 * time.Second,
+		KeepAlive: 60 * time.Second,
+	}).DialContext,
+	MaxIdleConns:          1000,
+	MaxIdleConnsPerHost:   1000,
+	IdleConnTimeout:       90 * time.Second,
+	TLSHandshakeTimeout:   10 * time.Second,
+	ExpectContinueTimeout: 1 * time.Second,
+	ResponseHeaderTimeout: 10 * time.Second,
+	ForceAttemptHTTP2:     true,
+}
+
+func NewHTTPRoute(Url *url.URL, Path string) HTTPRoute {
+	proxy := httputil.NewSingleHostReverseProxy(Url)
+	proxy.Transport = transport
+	return HTTPRoute{Url: Url, Path: Path, Proxy: proxy}
+}
+
+func redirectToTLS(w http.ResponseWriter, r *http.Request) {
+	// Redirect to the same host but with HTTPS
+	log.Printf("[Redirect] redirecting to https")
+	var redirectCode int
+	if r.Method == http.MethodGet {
+		redirectCode = http.StatusMovedPermanently
+	} else {
+		redirectCode = http.StatusPermanentRedirect
+	}
+	http.Redirect(w, r, fmt.Sprintf("https://%s%s?%s", r.Host, r.URL.Path, r.URL.RawQuery), redirectCode)
+}
+
+func httpProxyHandler(w http.ResponseWriter, r *http.Request) {
+	route, err := findHTTPRoute(r.Host, r.URL.Path)
+	if err != nil {
+		log.Printf("[Request] failed %s %s%s, error: %v",
+			r.Method,
+			r.Host,
+			r.URL.Path,
+			err,
+		)
+		http.Error(w, err.Error(), http.StatusNotFound)
+		return
+	}
+	route.Proxy.ServeHTTP(w, r)
+}