{koji,worker}/server: log errors returned from handlers

Previously, we had no clue what errors were catched by the default echo's
error handler. Thus, in the case of an error, we were basically blind. Let's
log all errors so we can investigate them later.

Signed-off-by: Ondřej Budai <ondrej@budai.cz>

internal/kojiapi/server.go

@@ -46,6 +46,12 @@ func (s *Server) Handler(path string) http.Handler {
 	e.Binder = binder{}
 	e.StdLogger = s.logger
 
+	// log errors returned from handlers
+	e.HTTPErrorHandler = func(err error, c echo.Context) {
+		log.Println(c.Path(), c.QueryParams().Encode(), err.Error())
+		e.DefaultHTTPErrorHandler(err, c)
+	}
+
 	api.RegisterHandlers(e.Group(path), &apiHandlers{s})
 
 	return e

internal/worker/server.go

@@ -62,6 +62,12 @@ func (s *Server) Handler() http.Handler {
 	e.Binder = binder{}
 	e.StdLogger = s.logger
 
+	// log errors returned from handlers
+	e.HTTPErrorHandler = func(err error, c echo.Context) {
+		log.Println(c.Path(), c.QueryParams().Encode(), err.Error())
+		e.DefaultHTTPErrorHandler(err, c)
+	}
+
 	handler := apiHandlers{
 		server: s,
 	}