Massive refactoring of extensions sync code

chrome/browser/sync/glue/extension_sync.h

Index: chrome/browser/sync/glue/extension_sync.h
diff --git a/chrome/browser/sync/glue/extension_sync.h b/chrome/browser/sync/glue/extension_sync.h
new file mode 100644
index 0000000000000000000000000000000000000000..a3c0b748c2fb7131c536e92bd2ee85abaa13c3a9
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+++ b/chrome/browser/sync/glue/extension_sync.h
@@ -0,0 +1,86 @@
+// Copyright (c) 2010 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.
+
+#ifndef CHROME_BROWSER_SYNC_GLUE_EXTENSION_SYNC_H_
+#define CHROME_BROWSER_SYNC_GLUE_EXTENSION_SYNC_H_
+#pragma once
+
+// This file contains functions necessary for syncing
+// extensions-related data types.
+
+#include <map>
+#include <string>
+
+class Extension;
+class ExtensionsService;
+class Profile;
+class ProfileSyncService;
+
+namespace sync_pb {
+class ExtensionSpecifics;
+}  // namespace sync_pb
+
+namespace browser_sync {
+
+class ExtensionData;
+struct ExtensionSyncTraits;
+
+// A map from extension IDs to ExtensionData objects.
+typedef std::map<std::string, ExtensionData> ExtensionDataMap;
+
+// Fills in |has_children| with whether or not the root node with the
+// given tag has child nodes.  Returns true iff the lookup succeeded.
+//
+// TODO(akalin): Move this somewhere where it can be used by
+// other data types.
+bool RootNodeHasChildren(const char* tag,
+                         ProfileSyncService* sync_service,
+                         bool* has_children);
+
+ExtensionsService* GetExtensionsServiceFromProfile(Profile* profile);
+
+// Fills |extension_data_map| with both client-side information about
+// installed extensions and the server-side information about
+// extensions to be synced.  Returns true iff this was successful; if
+// unsuccessful, the contents of |extension_data_map| are undefined.
+bool SlurpExtensionData(const ExtensionSyncTraits& traits,
+                        ProfileSyncService* sync_service,
+                        ExtensionDataMap* extension_data_map);
+
+// Updates the server and client as necessary from
+// |extension_data_map|.  Returns true iff this was successful.
+//
+// NOTE(akalin): Keep in mind that updating the client is an
+// asynchronous process; the only thing that's guaranteed if this
+// function is returned is that the updates were successfully started.
+bool FlushExtensionData(const ExtensionSyncTraits& traits,
+                        const ExtensionDataMap& extension_data_map,
+                        ProfileSyncService* sync_service);
+
+// Updates the server data for the given extension.  Returns true iff
+// this was successful; if unsuccessful, an error string is put into
+// |error|.
+bool UpdateServerData(const ExtensionSyncTraits& traits,
+                      const Extension& extension,
+                      ProfileSyncService* sync_service,
+                      std::string* error);
+
+// Updates the server data for the given extension, if it exists.
+void RemoveServerData(const ExtensionSyncTraits& traits,
+                      const Extension& extension,
+                      ProfileSyncService* sync_service);
+
+// Starts updating the client data from the given server data.
+void UpdateClient(const ExtensionSyncTraits& traits,
+                  const sync_pb::ExtensionSpecifics& server_data,
+                  ExtensionsService* extensions_service);
+
+// Removes existing client data for the given extension.
+void RemoveFromClient(const ExtensionSyncTraits& traits,
+                      const std::string& id,
+                      ExtensionsService* extensions_service);
+
+}  // namespace browser_sync
+
+#endif  // CHROME_BROWSER_SYNC_GLUE_EXTENSION_SYNC_H_