| // 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. |
| |
| 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/v3/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") |
| } |
| } |
| } |