151 lines
3.6 KiB
Go
151 lines
3.6 KiB
Go
package main
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import (
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"bytes"
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"compress/gzip"
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"encoding/json"
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"fmt"
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"io"
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"io/ioutil"
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"net/http"
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"net/http/httputil"
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"net/url"
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"strconv"
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"strings"
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"github.com/googollee/go-socket.io"
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)
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type transport struct {
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http.RoundTripper
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itemInfoPath string
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maxItems int
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currItemID int
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}
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var captures Captures
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var dashboardSocket socketio.Socket
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func main() {
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args := ParseArgs()
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proxyHost := fmt.Sprintf("http://localhost:%s", args.proxyPort)
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dashboardPath := fmt.Sprintf("/%s/", args.dashboard)
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dashboardItemInfoPath := fmt.Sprintf("/%s/items/", args.dashboard)
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transp := &transport{
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RoundTripper: http.DefaultTransport,
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itemInfoPath: dashboardItemInfoPath,
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maxItems: args.maxCaptures,
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currItemID: 0,
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}
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http.Handle("/", getProxyHandler(args.targetURL, transp))
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http.Handle("/socket.io/", getDashboardSocketHandler())
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http.Handle(dashboardPath, getDashboardHandler())
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http.Handle(dashboardItemInfoPath, getDashboardItemInfoHandler())
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fmt.Printf("\nListening on %s", proxyHost)
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fmt.Printf("\n %s/%s\n\n", proxyHost, args.dashboard)
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fmt.Println(http.ListenAndServe(":"+args.proxyPort, nil))
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}
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func getDashboardSocketHandler() http.Handler {
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server, err := socketio.NewServer(nil)
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if err != nil {
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fmt.Println("socket server error", err)
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}
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server.On("connection", func(so socketio.Socket) {
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dashboardSocket = so
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dashboardSocket.Emit("captures", captures.MetadataOnly())
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})
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server.On("error", func(so socketio.Socket, err error) {
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fmt.Println("socket error", err)
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})
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return server
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}
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func getDashboardHandler() http.Handler {
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return http.HandlerFunc(func(res http.ResponseWriter, req *http.Request) {
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res.Header().Add("Content-Type", "text/html")
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res.Write([]byte(dashboardHTML))
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})
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}
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func getDashboardItemInfoHandler() http.Handler {
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return http.HandlerFunc(func(res http.ResponseWriter, req *http.Request) {
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id := req.URL.Path[strings.LastIndex(req.URL.Path, "/")+1:]
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i, _ := strconv.Atoi(id)
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json, _ := json.Marshal(captures[i])
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res.Header().Add("Content-Type", "application/json")
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res.Write([]byte(json))
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})
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}
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func getProxyHandler(url *url.URL, transp *transport) http.Handler {
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proxy := httputil.NewSingleHostReverseProxy(url)
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proxy.Transport = transp
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return http.HandlerFunc(func(response http.ResponseWriter, request *http.Request) {
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request.Host = request.URL.Host
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proxy.ServeHTTP(response, request)
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})
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}
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func (t *transport) RoundTrip(req *http.Request) (*http.Response, error) {
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reqDump, err := dumpRequest(req)
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if err != nil {
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return nil, err
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}
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res, err := t.RoundTripper.RoundTrip(req)
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if err != nil {
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return nil, fmt.Errorf("uh oh | %v | %s", err, req.URL)
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}
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resDump, err := dumpResponse(res)
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if err != nil {
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return nil, err
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}
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capture := Capture{
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ID: t.NewItemID(),
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Path: req.URL.Path,
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Method: req.Method,
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Status: res.StatusCode,
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InfoPath: t.itemInfoPath,
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Request: string(reqDump),
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Response: string(resDump),
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}
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captures.Add(capture)
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captures.RemoveLastAfterReaching(t.maxItems)
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if dashboardSocket != nil {
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dashboardSocket.Emit("captures", captures.MetadataOnly())
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}
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return res, nil
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}
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func (t *transport) NewItemID() int {
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t.currItemID++
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return t.currItemID
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}
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func dumpRequest(req *http.Request) ([]byte, error) {
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return httputil.DumpRequest(req, true)
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}
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func dumpResponse(res *http.Response) ([]byte, error) {
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var originalBody bytes.Buffer
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reader := io.TeeReader(res.Body, &originalBody)
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if res.Header.Get("Content-Encoding") == "gzip" {
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reader, _ = gzip.NewReader(reader)
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}
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res.Body = ioutil.NopCloser(reader)
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resDump, err := httputil.DumpResponse(res, true)
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res.Body = ioutil.NopCloser(&originalBody)
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return resDump, err
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}
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