Add return values to SyncerCommand

chrome/browser/sync/internal_api/includes/syncer_error.h

+// 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.
+
+#ifndef CHROME_BROWSER_SYNC_INTERNAL_API_INCLUDES_SYNCER_ERROR_H_
+#define CHROME_BROWSER_SYNC_INTERNAL_API_INCLUDES_SYNCER_ERROR_H_
+#pragma once
+
+namespace browser_sync {
+
+// This enum describes all the ways a SyncerCommand can fail.
+//
+// SyncerCommands do many different things, but they share a common function
+// signature.  This enum, the return value for all SyncerCommands, must be able
+// to describe any possible failure for all SyncerComand.
+//
+// For convenience, functions which are invoked only by SyncerCommands may also
+// return a SyncerError.  It saves us having to write a conversion function, and
+// it makes refactoring easier.
+enum SyncerError {
+  UNSET = 0,       // Default value.
+  DIRECTORY_LOOKUP_FAILED, // Local directory lookup failure.
+
+  NETWORK_CONNECTION_UNAVAILABLE,  // Connectivity failure.
+  NETWORK_IO_ERROR,                // Response buffer read error.
+  SYNC_SERVER_ERROR,               // Non auth HTTP error.
+  SYNC_AUTH_ERROR,                 // HTTP auth error.
+
+  // Based on values returned by server.  Most are defined in sync.proto.
+  SERVER_RETURN_INVALID_CREDENTIAL,
+  SERVER_RETURN_UNKNOWN_ERROR,
+  SERVER_RETURN_THROTTLED,
+  SERVER_RETURN_TRANSIENT_ERROR,
+  SERVER_RETURN_MIGRATION_DONE,
+  SERVER_RETURN_CLEAR_PENDING,
+  SERVER_RETURN_NOT_MY_BIRTHDAY,
+  SERVER_RESPONSE_VALIDATION_FAILED,
+
+  SYNCER_OK
+};
+
+const char * GetSyncerErrorString(SyncerError);
+
+}  // namespace browser_sync
+
+#endif  // CHROME_BROWSER_SYNC_INTERNAL_API_INCLUDES_SYNCER_ERROR_H_