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middleware.go
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middleware.go
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package go_mux
import (
"bytes"
"fmt"
"io"
"io/ioutil"
"net/http"
"net/http/httptest"
"net/url"
"os"
"strings"
)
type teeCloser struct {
tee io.Reader
source io.Closer
}
func (tc *teeCloser) Read(p []byte) (n int, err error) {
return tc.tee.Read(p)
}
func (tc *teeCloser) Close() error {
_ = tc.source.Close()
return nil
}
func WrapReader(source io.ReadCloser) (firstReader io.ReadCloser, secondReader io.ReadCloser) {
var buffer bytes.Buffer
copyReader := ioutil.NopCloser(&buffer)
tee := io.TeeReader(source, &buffer)
tc := &teeCloser{tee, source}
return tc, copyReader
}
func Middleware(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
if !shouldLogRequest(r) {
next.ServeHTTP(w, r)
return
}
//log.Print("optic: before")
//log.Print(r)
requestBody, requestBodyCopyReader := WrapReader(r.Body)
requestCopy := r
requestCopy.Body = requestBody
responseRecorder := httptest.NewRecorder()
next.ServeHTTP(responseRecorder, requestCopy)
//log.Print("optic: after")
response := responseRecorder.Result()
responseBody, responseBodyCopyReader := WrapReader(response.Body)
response.Body = responseBody
//log.Print("optic: before replaying response")
WriteResponse(response, w)
//log.Print("optic: after replaying response")
//log.Print("optic: before logging request and response")
logInteraction(requestCopy, requestBodyCopyReader, response, responseBodyCopyReader)
//log.Print("optic: after logging request and response")
})
}
func WriteResponse(response *http.Response, w http.ResponseWriter) {
//log.Printf("optic: writing response (%d)", response.StatusCode)
for k, v := range response.Header {
//log.Print(k)
//log.Print(v)
w.Header()[k] = v
}
w.WriteHeader(response.StatusCode)
_, err := io.Copy(w, response.Body)
if err != nil {
//log.Print(err)
return
}
//log.Printf("body: %d bytes written", bytesWritten)
}
func isWsHandshakeRequest(req *http.Request) bool {
if strings.ToLower(req.Header.Get("Upgrade")) == "websocket" {
parts := strings.Split(strings.ToLower(req.Header.Get("Connection")), ",")
for _, part := range parts {
if strings.TrimSpace(part) == "upgrade" {
return true
}
}
}
return false
}
func shouldLogRequest(req *http.Request) bool {
shouldUseOptic := len(os.Getenv("OPTIC_SERVER_LISTENING")) > 0
if !shouldUseOptic {
return false
}
if isWsHandshakeRequest(req) {
return false
}
return true
}
func logInteraction(req *http.Request, requestBody io.ReadCloser, res *http.Response, responseBody io.ReadCloser) {
interactionId, err := logRequest(req, requestBody)
if err == nil {
err := logResponse(interactionId, res, responseBody)
if err != nil {
//log.Print("optic error logging response")
//log.Print(fmt.Sprint(err))
}
} else {
//log.Print("optic error logging request")
//log.Print(fmt.Sprint(err))
}
}
func logResponse(interactionId string, res *http.Response, responseBody io.ReadCloser) (err error) {
host := os.Getenv("OPTIC_SERVER_HOST")
client := http.DefaultClient
path := fmt.Sprintf("/interactions/%s/status/%d", interactionId, res.StatusCode)
responseUrl := &url.URL{
Scheme: "http",
Host: host + ":30335",
Path: path,
}
responseLog := &http.Request{
Method: "POST",
Body: responseBody,
Header: res.Header,
URL: responseUrl,
}
//log.Print("updated request for logging response")
//log.Print(res.Header)
_, err = client.Do(responseLog)
return err;
}
func logRequest(req *http.Request, requestBody io.ReadCloser) (interactionId string, err error) {
host := os.Getenv("OPTIC_SERVER_HOST")
client := http.DefaultClient
requestUrl := req.URL
requestUrl.Scheme = "http"
requestUrl.Host = host + ":30334"
logRequestRequest := &http.Request{
URL: requestUrl,
Method: req.Method,
Body: requestBody,
Header: req.Header,
}
logRequestRequest.URL = requestUrl
//log.Print("updated request for logging request")
//log.Print(logRequestRequest)
interactionResponse, err := client.Do(logRequestRequest)
if err == nil {
buffer := new(bytes.Buffer)
_, _ = buffer.ReadFrom(interactionResponse.Body)
interactionId := buffer.String()
//log.Printf("interactionID %s", interactionId)
return interactionId, nil
}
return "", err
}