sync/engine/syncer_proto_util.h

   1 // Copyright 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef SYNC_ENGINE_SYNCER_PROTO_UTIL_H_
   6 #define SYNC_ENGINE_SYNCER_PROTO_UTIL_H_
   7
   8 #include <string>
   9
  10 #include "base/gtest_prod_util.h"
  11 #include "base/time/time.h"
  12 #include "sync/base/sync_export.h"
  13 #include "sync/internal_api/public/base/model_type.h"
  14 #include "sync/internal_api/public/util/syncer_error.h"
  15 #include "sync/sessions/sync_session.h"
  16 #include "sync/syncable/blob.h"
  17
  18 namespace sync_pb {
  19 class ClientToServerMessage;
  20 class ClientToServerResponse;
  21 class ClientToServerResponse_Error;
  22 class CommitResponse_EntryResponse;
  23 class EntitySpecifics;
  24 class SyncEntity;
  25 }
  26
  27 namespace syncer {
  28
  29 class ServerConnectionManager;
  30
  31 namespace sessions {
  32 class SyncProtocolError;
  33 class SyncSessionContext;
  34 }
  35
  36 namespace syncable {
  37 class Directory;
  38 class Entry;
  39 }
  40
  41 // Returns the types to migrate from the data in |response|.
  42 SYNC_EXPORT_PRIVATE ModelTypeSet GetTypesToMigrate(
  43     const sync_pb::ClientToServerResponse& response);
  44
  45 // Builds a SyncProtocolError from the data in |error|.
  46 SYNC_EXPORT_PRIVATE SyncProtocolError ConvertErrorPBToLocalType(
  47     const sync_pb::ClientToServerResponse_Error& error);
  48
  49 class SYNC_EXPORT_PRIVATE SyncerProtoUtil {
  50  public:
  51   // Posts the given message and fills the buffer with the returned value.
  52   // Returns true on success.  Also handles store birthday verification: will
  53   // produce a SyncError if the birthday is incorrect.
  54   // NOTE: This will add all fields that must be sent on every request, which
  55   // includes store birthday, protocol version, client chips, api keys, etc.
  56   static SyncerError PostClientToServerMessage(
  57       sync_pb::ClientToServerMessage* msg,
  58       sync_pb::ClientToServerResponse* response,
  59       sessions::SyncSession* session);
  60
  61   static bool ShouldMaintainPosition(const sync_pb::SyncEntity& sync_entity);
  62
  63   // Utility methods for converting between syncable::Blobs and protobuf byte
  64   // fields.
  65   static void CopyProtoBytesIntoBlob(const std::string& proto_bytes,
  66                                      syncable::Blob* blob);
  67   static bool ProtoBytesEqualsBlob(const std::string& proto_bytes,
  68                                    const syncable::Blob& blob);
  69   static void CopyBlobIntoProtoBytes(const syncable::Blob& blob,
  70                                      std::string* proto_bytes);
  71
  72   // Extract the name field from a sync entity.
  73   static const std::string& NameFromSyncEntity(
  74       const sync_pb::SyncEntity& entry);
  75
  76   // Extract the name field from a commit entry response.
  77   static const std::string& NameFromCommitEntryResponse(
  78       const sync_pb::CommitResponse_EntryResponse& entry);
  79
  80   // Persist the bag of chips if it is present in the response.
  81   static void PersistBagOfChips(
  82       syncable::Directory* dir,
  83       const sync_pb::ClientToServerResponse& response);
  84
  85   // EntitySpecifics is used as a filter for the GetUpdates message to tell
  86   // the server which datatypes to send back.  This adds a datatype so that
  87   // it's included in the filter.
  88   static void AddToEntitySpecificDatatypesFilter(ModelType datatype,
  89       sync_pb::EntitySpecifics* filter);
  90
  91   // Get a debug string representation of the client to server response.
  92   static std::string ClientToServerResponseDebugString(
  93       const sync_pb::ClientToServerResponse& response);
  94
  95   // Get update contents as a string. Intended for logging, and intended
  96   // to have a smaller footprint than the protobuf's built-in pretty printer.
  97   static std::string SyncEntityDebugString(const sync_pb::SyncEntity& entry);
  98
  99   // Pull the birthday from the dir and put it into the msg.
 100   static void AddRequestBirthday(syncable::Directory* dir,
 101                                  sync_pb::ClientToServerMessage* msg);
 102
 103   // Pull the bag of chips from the dir and put it into the msg.
 104   static void AddBagOfChips(syncable::Directory* dir,
 105                             sync_pb::ClientToServerMessage* msg);
 106
 107
 108   // Set the protocol version field in the outgoing message.
 109   static void SetProtocolVersion(sync_pb::ClientToServerMessage* msg);
 110
 111  private:
 112   SyncerProtoUtil() {}
 113
 114   // Helper functions for PostClientToServerMessage.
 115
 116   // Verifies the store birthday, alerting/resetting as appropriate if there's a
 117   // mismatch. Return false if the syncer should be stuck.
 118   static bool VerifyResponseBirthday(
 119       const sync_pb::ClientToServerResponse& response,
 120       syncable::Directory* dir);
 121
 122   // Returns true if sync is disabled by admin for a dasher account.
 123   static bool IsSyncDisabledByAdmin(
 124       const sync_pb::ClientToServerResponse& response);
 125
 126   // Post the message using the scm, and do some processing on the returned
 127   // headers. Decode the server response.
 128   static bool PostAndProcessHeaders(ServerConnectionManager* scm,
 129                                     sessions::SyncSession* session,
 130                                     const sync_pb::ClientToServerMessage& msg,
 131                                     sync_pb::ClientToServerResponse* response);
 132
 133   static base::TimeDelta GetThrottleDelay(
 134       const sync_pb::ClientToServerResponse& response);
 135
 136   friend class SyncerProtoUtilTest;
 137   FRIEND_TEST_ALL_PREFIXES(SyncerProtoUtilTest, AddRequestBirthday);
 138   FRIEND_TEST_ALL_PREFIXES(SyncerProtoUtilTest, PostAndProcessHeaders);
 139   FRIEND_TEST_ALL_PREFIXES(SyncerProtoUtilTest, VerifyDisabledByAdmin);
 140   FRIEND_TEST_ALL_PREFIXES(SyncerProtoUtilTest, VerifyResponseBirthday);
 141   FRIEND_TEST_ALL_PREFIXES(SyncerProtoUtilTest, HandleThrottlingNoDatatypes);
 142   FRIEND_TEST_ALL_PREFIXES(SyncerProtoUtilTest, HandleThrottlingWithDatatypes);
 143
 144   DISALLOW_COPY_AND_ASSIGN(SyncerProtoUtil);
 145 };
 146
 147 }  // namespace syncer
 148
 149 #endif  // SYNC_ENGINE_SYNCER_PROTO_UTIL_H_