For debugging, provide a way to see data passing in and out of weaveproxy

[bboreham]

Sometimes, to understand what has gone wrong, we would like to see the exact json that went in and out of the proxy.

[tomwilkie]

diff --git a/proxy/common.go b/proxy/common.go
index 4c0f3fc..8f457f2 100644
--- a/proxy/common.go
+++ b/proxy/common.go
@@ -42,6 +42,7 @@ func callWeave(args ...string) ([]byte, []byte, error) {

 func unmarshalRequestBody(r *http.Request, target interface{}) error {
        body, err := ioutil.ReadAll(r.Body)
+       Log.Infof("->requestBody: %s", body)
        if err != nil {
                return err
        }
@@ -60,6 +61,7 @@ func marshalRequestBody(r *http.Request, body interface{}) error {
        if err != nil {
                return err
        }
+       Log.Infof("<-requestBody: %s", newBody)
        r.Body = ioutil.NopCloser(bytes.NewReader(newBody))
        r.ContentLength = int64(len(newBody))
        return nil

Was helpful to me...

[bboreham]

Shall we just do this on --log-level=debug, or should I add an extra flag to turn it on?