debug: Add RoundTripper

src/restic/debug/round_tripper_debug.go

@@ -0,0 +1,43 @@
+// +build debug
+
+package debug
+
+import (
+	"net/http"
+	"net/http/httputil"
+)
+
+type loggingRoundTripper struct {
+	http.RoundTripper
+}
+
+// RoundTripper returns a new http.RoundTripper which logs all requests (if
+// debug is enabled). When debug is not enabled, upstream is returned.
+func RoundTripper(upstream http.RoundTripper) http.RoundTripper {
+	return loggingRoundTripper{upstream}
+}
+
+func (tr loggingRoundTripper) RoundTrip(req *http.Request) (res *http.Response, err error) {
+	trace, err := httputil.DumpRequestOut(req, false)
+	if err != nil {
+		Log("DumpRequestOut() error: %v\n", err)
+	} else {
+		Log("------------  HTTP REQUEST -----------\n%s", trace)
+	}
+
+	res, err = tr.RoundTripper.RoundTrip(req)
+	if err != nil {
+		Log("RoundTrip() returned error: %v", err)
+	}
+
+	if res != nil {
+		trace, err := httputil.DumpResponse(res, false)
+		if err != nil {
+			Log("DumpResponse() error: %v\n", err)
+		} else {
+			Log("------------  HTTP RESPONSE ----------\n%s", trace)
+		}
+	}
+
+	return res, err
+}

src/restic/debug/round_tripper_release.go

@@ -0,0 +1,11 @@
+// +build !debug
+
+package debug
+
+import "net/http"
+
+// RoundTripper returns a new http.RoundTripper which logs all requests (if
+// debug is enabled). When debug is not enabled, upstream is returned.
+func RoundTripper(upstream http.RoundTripper) http.RoundTripper {
+	return upstream
+}