diff -r 5d721a565503 -r 872e936f9f3f log.go
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/log.go	Sun Dec 16 15:15:59 2012 -0700
@@ -0,0 +1,36 @@
+// Copyright 2011 The Go Authors.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Control over logging from the XMPP library.
+
+package xmpp
+
+var (
+	// If any of these are non-nil when NewClient() is called,
+	// they will be used to log messages of the indicated
+	// severity.
+	Warn Logger = &noLog{}
+	Info Logger = &noLog{}
+	Debug Logger = &noLog{}
+)
+
+// Anything implementing Logger can receive log messages from the XMPP
+// library. The default implementation doesn't log anything; it
+// efficiently discards all messages.
+type Logger interface {
+	Log(v ...interface{})
+	Logf(fmt string, v ...interface{})
+}
+
+type noLog struct {
+	flags  int
+	prefix string
+}
+var _ Logger = &noLog{}
+
+func (l *noLog) Log(v ...interface{}) {
+}
+
+func (l *noLog) Logf(fmt string, v ...interface{}) {
+}