Log the sync communication that happens between client and server.

chrome/browser/sync/engine/traffic_logger.cc

Index: chrome/browser/sync/engine/traffic_logger.cc
diff --git a/chrome/browser/sync/engine/traffic_logger.cc b/chrome/browser/sync/engine/traffic_logger.cc
new file mode 100644
index 0000000000000000000000000000000000000000..21f800e503914fa58fdcee5f3643fb9c9b32f330
--- /dev/null
+++ b/chrome/browser/sync/engine/traffic_logger.cc
@@ -0,0 +1,49 @@
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "chrome/browser/sync/engine/traffic_logger.h"
+
+#include <string>
+
+#include "base/json/json_writer.h"
+#include "base/logging.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/values.h"
+#include "chrome/browser/sync/protocol/proto_value_conversions.h"
+#include "chrome/browser/sync/protocol/sync.pb.h"
+
+namespace browser_sync {
+
+namespace {
+template <class T>
+void LogData(const T& data,
+             DictionaryValue* (*to_dictionary_value)(const T&, bool),
+             const std::string& description) {
+  if (VLOG_IS_ON(1)) {
+    scoped_ptr<DictionaryValue> value((*to_dictionary_value)(data,
+                                      true /* decode_specifics */));
+    std::string message;
+    base::JSONWriter::Write(value.get(), true /* pretty_print */, &message);
+    VLOG(1) << "\n" << description;
+    VLOG(1) << "\n" << message;

[akalin, 2012/03/14 00:17:30]

may want to make it a single line, like:

VLOG(1) << "\n" << description << "\n" << message;

Since the message contains newlines anyway, may as well just print the VLOG
prefix stuff once

[lipalani1, 2012/03/15 00:02:13]

Done.

+  }
+}
+}  // namespace
+
+void LogClientToServerMessage(const sync_pb::ClientToServerMessage& msg) {
+  LogData(msg, &ClientToServerMessageToValue,
+          "******Client To Server Message******");
+  // TODO(lipalani) : Store the data(minus specifics)

[akalin, 2012/03/14 00:17:30]

space before '(minus'

[lipalani1, 2012/03/15 00:02:13]

Done.

+  // in a circular buffer in memory.
+}
+
+void LogClientToServerResponse(
+    const sync_pb::ClientToServerResponse& response) {
+  LogData(response, &ClientToServerResponseToValue,
+          "******Server Response******");
+  // TODO(lipalani) : Store the data(minus specifics)

[akalin, 2012/03/14 00:17:30]

here too

[lipalani1, 2012/03/15 00:02:13]

Done.

+  // in a circular buffer in memory.
+}
+
+}  // namespace browser_sync