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// Copyright 2014 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 "sync/internal_api/public/model_type_entity.h"
#include <stdint.h>
#include "base/base64.h"
#include "base/sha1.h"
#include "base/time/time.h"
#include "sync/internal_api/public/non_blocking_sync_common.h"
#include "sync/syncable/syncable_util.h"
#include "sync/util/time.h"
namespace syncer_v2 {
scoped_ptr<ModelTypeEntity> ModelTypeEntity::CreateNew(
const std::string& client_tag,
const std::string& client_tag_hash,
const std::string& id,
base::Time creation_time) {
// Initialize metadata
sync_pb::EntityMetadata metadata;
metadata.set_client_tag_hash(client_tag_hash);
if (!id.empty())
metadata.set_server_id(id);
metadata.set_sequence_number(0);
metadata.set_acked_sequence_number(0);
metadata.set_server_version(kUncommittedVersion);
metadata.set_creation_time(syncer::TimeToProtoTime(creation_time));
return scoped_ptr<ModelTypeEntity>(
new ModelTypeEntity(client_tag, &metadata));
}
scoped_ptr<ModelTypeEntity> ModelTypeEntity::CreateFromMetadata(
const std::string& client_tag,
sync_pb::EntityMetadata* metadata) {
return scoped_ptr<ModelTypeEntity>(new ModelTypeEntity(client_tag, metadata));
}
ModelTypeEntity::ModelTypeEntity(const std::string& client_tag,
sync_pb::EntityMetadata* metadata)
: client_tag_(client_tag),
commit_requested_sequence_number_(metadata->acked_sequence_number()) {
DCHECK(metadata->has_client_tag_hash());
DCHECK(metadata->has_creation_time());
metadata_.Swap(metadata);
}
ModelTypeEntity::~ModelTypeEntity() {}
void ModelTypeEntity::CacheCommitData(EntityData* data) {
DCHECK(RequiresCommitRequest());
if (data->client_tag_hash.empty()) {
data->client_tag_hash = metadata_.client_tag_hash();
}
commit_data_ = data->PassToPtr();
DCHECK(HasCommitData());
}
bool ModelTypeEntity::HasCommitData() const {
return !commit_data_->client_tag_hash.empty();
}
bool ModelTypeEntity::IsUnsynced() const {
return metadata_.sequence_number() > metadata_.acked_sequence_number();
}
bool ModelTypeEntity::RequiresCommitRequest() const {
return metadata_.sequence_number() > commit_requested_sequence_number_;
}
bool ModelTypeEntity::RequiresCommitData() const {
return RequiresCommitRequest() && !HasCommitData() && !metadata_.is_deleted();
}
bool ModelTypeEntity::UpdateIsReflection(int64_t update_version) const {
return metadata_.server_version() >= update_version;
}
bool ModelTypeEntity::UpdateIsInConflict(int64_t update_version) const {
return IsUnsynced() && !UpdateIsReflection(update_version);
}
void ModelTypeEntity::ApplyUpdateFromServer(
const UpdateResponseData& response_data) {
DCHECK(metadata_.has_client_tag_hash());
DCHECK(!metadata_.client_tag_hash().empty());
DCHECK(metadata_.has_sequence_number());
// TODO(stanisc): crbug/561829: Filter out update if specifics hash hasn't
// changed.
// TODO(stanisc): crbug/521867: Understand and verify the conflict resolution
// logic here.
// There was a conflict and the server just won it.
// This implicitly acks all outstanding commits because a received update
// will clobber any pending commits on the sync thread.
metadata_.set_acked_sequence_number(metadata_.sequence_number());
commit_requested_sequence_number_ = metadata_.sequence_number();
metadata_.set_server_version(response_data.response_version);
metadata_.set_modification_time(
syncer::TimeToProtoTime(response_data.entity->modification_time));
UpdateSpecificsHash(response_data.entity->specifics);
encryption_key_name_ = response_data.encryption_key_name;
}
void ModelTypeEntity::MakeLocalChange(scoped_ptr<EntityData> data) {
DCHECK(!metadata_.client_tag_hash().empty());
DCHECK_EQ(metadata_.client_tag_hash(), data->client_tag_hash);
DCHECK(!data->modification_time.is_null());
metadata_.set_modification_time(
syncer::TimeToProtoTime(data->modification_time));
metadata_.set_is_deleted(false);
IncrementSequenceNumber();
UpdateSpecificsHash(data->specifics);
data->id = metadata_.server_id();
data->creation_time = syncer::ProtoTimeToTime(metadata_.creation_time());
CacheCommitData(data.get());
}
void ModelTypeEntity::UpdateDesiredEncryptionKey(const std::string& name) {
if (encryption_key_name_ == name)
return;
DVLOG(2) << metadata_.server_id()
<< ": Encryption triggered commit: " << encryption_key_name_
<< " -> " << name;
// Schedule commit with the expectation that the worker will re-encrypt with
// the latest encryption key as it does.
IncrementSequenceNumber();
}
void ModelTypeEntity::Delete() {
IncrementSequenceNumber();
metadata_.set_is_deleted(true);
metadata_.clear_specifics_hash();
// Clear any cached pending commit data.
if (HasCommitData()) commit_data_.reset();
}
void ModelTypeEntity::InitializeCommitRequestData(CommitRequestData* request) {
if (!metadata_.is_deleted()) {
DCHECK(HasCommitData());
DCHECK_EQ(commit_data_->client_tag_hash, metadata_.client_tag_hash());
request->entity = commit_data_;
} else {
// Make an EntityData with empty specifics to indicate deletion. This is
// done lazily here to simplify loading a pending deletion on startup.
EntityData data;
data.client_tag_hash = metadata_.client_tag_hash();
data.id = metadata_.server_id();
data.creation_time = syncer::ProtoTimeToTime(metadata_.creation_time());
request->entity = data.PassToPtr();
}
request->sequence_number = metadata_.sequence_number();
request->base_version = metadata_.server_version();
commit_requested_sequence_number_ = metadata_.sequence_number();
}
void ModelTypeEntity::ReceiveCommitResponse(
const std::string& id,
int64_t sequence_number,
int64_t response_version,
const std::string& encryption_key_name) {
// The server can assign us a new ID in a commit response.
metadata_.set_server_id(id);
metadata_.set_acked_sequence_number(sequence_number);
metadata_.set_server_version(response_version);
encryption_key_name_ = encryption_key_name;
}
void ModelTypeEntity::ClearTransientSyncState() {
// If we have any unacknowledged commit requests outstanding, they've been
// dropped and we should forget about them.
commit_requested_sequence_number_ = metadata_.acked_sequence_number();
}
void ModelTypeEntity::IncrementSequenceNumber() {
DCHECK(metadata_.has_sequence_number());
metadata_.set_sequence_number(metadata_.sequence_number() + 1);
}
// Update hash string for EntitySpecifics.
void ModelTypeEntity::UpdateSpecificsHash(
const sync_pb::EntitySpecifics& specifics) {
if (specifics.ByteSize() > 0) {
std::string hash_input;
specifics.AppendToString(&hash_input);
base::Base64Encode(base::SHA1HashString(hash_input),
metadata_.mutable_specifics_hash());
} else {
metadata_.clear_specifics_hash();
}
}
} // namespace syncer_v2
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