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- // Copyright 2018 Google LLC
- //
- // Licensed under the Apache License, Version 2.0 (the "License");
- // you may not use this file except in compliance with the License.
- // You may obtain a copy of the License at
- //
- // http://www.apache.org/licenses/LICENSE-2.0
- //
- // Unless required by applicable law or agreed to in writing, software
- // distributed under the License is distributed on an "AS IS" BASIS,
- // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- // See the License for the specific language governing permissions and
- // limitations under the License.
-
- // httpr is a proxy that can record or replay HTTP requests.
- // Start httpr with either the -record or -replay flags, providing a filename.
- // Terminate the process with an interrupt (kill -2) to write the log file when recording.
- // To get the CA certificate of the proxy, issue a GET to http://localhost:CP/authority.cer, where
- // CP is the control port.
-
- // +build go1.8
-
- package main
-
- import (
- "flag"
- "fmt"
- "io/ioutil"
- "log"
- "net"
- "net/http"
- "os"
- "os/signal"
-
- "cloud.google.com/go/httpreplay/internal/proxy"
- "github.com/google/martian/martianhttp"
- )
-
- var (
- port = flag.Int("port", 8080, "port of the proxy")
- controlPort = flag.Int("control-port", 8181, "port for controlling the proxy")
- record = flag.String("record", "", "record traffic and save to filename")
- replay = flag.String("replay", "", "read filename and replay traffic")
- debugHeaders = flag.Bool("debug-headers", false, "log header mismatches")
- )
-
- func main() {
- flag.Parse()
- if *record == "" && *replay == "" {
- log.Fatal("provide either -record or -replay")
- }
- if *record != "" && *replay != "" {
- log.Fatal("provide only one of -record and -replay")
- }
- log.Printf("httpr: starting proxy on port %d and control on port %d", *port, *controlPort)
-
- var pr *proxy.Proxy
- var err error
- if *record != "" {
- pr, err = proxy.ForRecording(*record, *port)
- } else {
- pr, err = proxy.ForReplaying(*replay, *port)
- }
- if err != nil {
- log.Fatal(err)
- }
- proxy.DebugHeaders = *debugHeaders
-
- // Expose handlers on the control port.
- mux := http.NewServeMux()
- mux.Handle("/authority.cer", martianhttp.NewAuthorityHandler(pr.CACert))
- mux.HandleFunc("/initial", handleInitial(pr))
- lControl, err := net.Listen("tcp", fmt.Sprintf(":%d", *controlPort))
- if err != nil {
- log.Fatal(err)
- }
- go http.Serve(lControl, mux)
-
- sigc := make(chan os.Signal, 1)
- signal.Notify(sigc, os.Interrupt)
-
- <-sigc
-
- log.Println("httpr: shutting down")
- if err := pr.Close(); err != nil {
- log.Fatal(err)
- }
- }
-
- func handleInitial(pr *proxy.Proxy) http.HandlerFunc {
- return func(w http.ResponseWriter, req *http.Request) {
- switch req.Method {
- case "GET":
- if pr.Initial != nil {
- w.Write(pr.Initial)
- }
-
- case "POST":
- bytes, err := ioutil.ReadAll(req.Body)
- req.Body.Close()
- if err != nil {
- w.WriteHeader(http.StatusInternalServerError)
- fmt.Fprintf(w, "reading body: %v", err)
- }
- pr.Initial = bytes
-
- default:
- w.WriteHeader(http.StatusBadRequest)
- fmt.Fprint(w, "use GET to retrieve initial or POST to set it")
- }
- }
- }
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