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// Copyright 2018 Google Inc. All Rights Reserved.
//
// 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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