wip - formatting

httpdebug.go

@@ -7,57 +7,111 @@ import (
 	"io/ioutil"
 	"log"
 	"net/http"
+	"strings"
 	"unicode"
 )
 
-// Wrap returns an http handler that serves h while logging requests and responses to stderr.
+type Mode int
+
+const (
+	ModeOneline Mode = iota
+	ModeTrimmed
+	ModeFull
+)
+
+var ModeDefault = ModeOneline
+
+// Wrap returns an http handler that serves h while logging requests and responses to stderr. It uses ModeDefault.
 func Wrap(h http.Handler) http.Handler {
+	return WrapMode(h, ModeDefault)
+}
+
+// WrapMode returns an http handler that serves h while logging requests and responses to stderr.
+func WrapMode(h http.Handler, m Mode) http.Handler {
 	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-		log.Println(r.Method, r.URL.Path, r.Proto)
+		switch m {
+		case ModeTrimmed:
+			serveTrimmed(h, w, r, 1024, 128)
+		case ModeFull:
+			serveTrimmed(h, w, r, 0, 0)
+		case ModeOneline:
+			buf := &bytes.Buffer{}
+			rw := &rw{
+				ResponseWriter: w,
+				w:              buf,
+			}
+
+			h.ServeHTTP(rw, r)
+			log.Println(r.Method, r.URL.Path, strings.Repeat("\t", 5-((len(r.Method)+len(r.URL.Path))/12)+1), rw.status, http.StatusText(rw.status), buf.Len(), "bytes", "\t", "("+w.Header().Get("Content-Type")+")")
+		}
+	})
+}
 
-		hBuf := &bytes.Buffer{}
-		r.Header.Write(hBuf)
-		log.Println(hBuf.String())
+func serveTrimmed(h http.Handler, w http.ResponseWriter, r *http.Request, trimAt, trimTo int64) {
+	log.Println(r.Method, r.URL.Path, r.Proto)
 
-		requestBuf := &bytes.Buffer{}
-		responseBuf := &bytes.Buffer{}
+	hBuf := &bytes.Buffer{}
+	r.Header.Write(hBuf)
+	log.Println(hBuf.String())
 
-		defer r.Body.Close()
+	requestBuf := &bytes.Buffer{}
+	responseBuf := &bytes.Buffer{}
 
-		r.Body = ioutil.NopCloser(io.TeeReader(r.Body, requestBuf))
+	defer r.Body.Close()
 
-		h.ServeHTTP(rw{
-			ResponseWriter: w,
-			w:              responseBuf,
-		}, r)
+	r.Body = ioutil.NopCloser(io.TeeReader(r.Body, requestBuf))
+
+	rw := &rw{
+		ResponseWriter: w,
+		w:              responseBuf,
+	}
 
-		if requestBuf.Len() > 1024 {
+	h.ServeHTTP(rw, r)
+
+	if trimAt > 0 && trimTo > 0 {
+		if int64(requestBuf.Len()) > trimAt {
 			trimmed := &bytes.Buffer{}
-			io.CopyN(trimmed, requestBuf, 128)
+			io.CopyN(trimmed, requestBuf, trimTo)
 			requestBuf = trimmed
 		}
+	}
 
-		log.Println()
-		log.Println(logsafe(requestBuf.String()))
+	log.Println()
+	log.Println(logsafe(requestBuf.String()))
 
-		hBuf.Reset()
-		w.Header().Write(hBuf)
-		log.Println(hBuf.String())
+	log.Println(rw.status)
 
-		responseBuf = trim(responseBuf, 128)
+	hBuf.Reset()
+	w.Header().Write(hBuf)
+	log.Println(hBuf.String())
 
-		log.Println()
-		log.Println(logsafe(responseBuf.String()))
-	})
+	if trimTo > 0 {
+		responseBuf = trim(responseBuf, int(trimTo))
+	}
+
+	log.Println()
+	log.Println(logsafe(responseBuf.String()))
 }
 
 type rw struct {
 	http.ResponseWriter
-	w io.Writer
+	w      io.Writer
+	status int
 }
 
-func (rw rw) Write(b []byte) (int, error) {
-	rw.w.Write(b)
+func (rw *rw) WriteHeader(s int) {
+	rw.status = s
+	rw.ResponseWriter.WriteHeader(s)
+}
+
+func (rw *rw) Write(b []byte) (int, error) {
+	if rw.status == 0 {
+		rw.WriteHeader(http.StatusOK)
+	}
+
+	if rw.w != nil {
+		rw.w.Write(b)
+	}
 	return rw.ResponseWriter.Write(b)
 }