pixiecore: add missing file.

The build was broken for a while. Doh.

pixiecore/logging.go

@@ -0,0 +1,36 @@
+// Copyright 2016 Google Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package pixiecore
+
+import (
+	"fmt"
+	"net/http"
+)
+
+func (s *Server) logf(format string, args ...interface{}) {
+	if s.Log == nil {
+		return
+	}
+	s.Log(fmt.Sprintf(format, args...))
+}
+
+// logHTTP logs a message with some context about the HTTP request
+// that caused the statement to be logged.
+func (s *Server) logHTTP(r *http.Request, format string, args ...interface{}) {
+	if s.Log != nil {
+		pfx := fmt.Sprintf("HTTP request for %s from %s: ", r.URL, r.RemoteAddr)
+		s.logf(pfx+format, args...)
+	}
+}