[sync] Add typed url sync metadata to the history db

components/history/core/browser/typed_url_sync_metadata_database.cc

Index: components/history/core/browser/typed_url_sync_metadata_database.cc
diff --git a/components/history/core/browser/typed_url_sync_metadata_database.cc b/components/history/core/browser/typed_url_sync_metadata_database.cc
new file mode 100644
index 0000000000000000000000000000000000000000..bb96da4636e58e3bb80d610cb57e190f3e480774
--- /dev/null
+++ b/components/history/core/browser/typed_url_sync_metadata_database.cc
@@ -0,0 +1,139 @@
+// Copyright 2017 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 "components/history/core/browser/typed_url_sync_metadata_database.h"
+
+#include "base/strings/string_number_conversions.h"
+#include "sql/statement.h"
+
+namespace history {
+
+namespace {
+
+const char kTypedURLModelTypeStateKey[] = "typed_url_model_type_state";

[brettw, 2017/03/20 17:27:06]

Can you provide documentation somewhere (maybe here is the best?) for what the
value of this key means in the database?

[Gang Wu, 2017/03/20 21:34:47]

Done.

+
+}  // namespace
+
+// Description of database table:
+//
+// typed_url_sync_metadata
+//   storage_key      the rowid of an entry in urls table, used by service to
+//                    look up native data with sync metadata records.
+//   value            Serialize sync EntityMetadata, which is for tracking sync
+//                    state of each typed url.
+
+TypedURLSyncMetadataDatabase::TypedURLSyncMetadataDatabase() {}
+
+TypedURLSyncMetadataDatabase::~TypedURLSyncMetadataDatabase() {}
+
+bool TypedURLSyncMetadataDatabase::GetAllSyncMetadata(
+    syncer::MetadataBatch* metadata_batch) {
+  syncer::EntityMetadataMap metadata_records_map;
+
+  // TODO(gangwu): crbug.com/701670 remove metadata_records_map to reduce memory
+  // usage and time.
+  if (GetAllSyncEntityMetadata(&metadata_records_map)) {
+    for (const auto& storage_key_to_metadata : metadata_records_map) {
+      metadata_batch->AddMetadata(storage_key_to_metadata.first,
+                                  storage_key_to_metadata.second);
+    }
+  } else {
+    return false;
+  }
+
+  sync_pb::ModelTypeState model_type_state;
+  if (GetModelTypeState(&model_type_state)) {
+    metadata_batch->SetModelTypeState(model_type_state);
+  } else {
+    return false;
+  }
+
+  return true;
+}
+
+bool TypedURLSyncMetadataDatabase::UpdateSyncMetadata(
+    const std::string& storage_key,
+    const sync_pb::EntityMetadata& metadata) {
+  int64_t storage_key_int = 0;
+  if (!base::StringToInt64(storage_key, &storage_key_int)) {
+    return false;
+  }
+  sql::Statement s(GetDB().GetUniqueStatement(
+      "INSERT OR REPLACE INTO typed_url_sync_metadata "
+      "(storage_key, value) VALUES(?, ?)"));
+  s.BindInt64(0, storage_key_int);
+  s.BindString(1, metadata.SerializeAsString());
+
+  return s.Run();
+}
+
+bool TypedURLSyncMetadataDatabase::ClearSyncMetadata(
+    const std::string& storage_key) {
+  int64_t storage_key_int = 0;
+  if (!base::StringToInt64(storage_key, &storage_key_int)) {
+    return false;
+  }
+  sql::Statement s(GetDB().GetUniqueStatement(
+      "DELETE FROM typed_url_sync_metadata WHERE storage_key=?"));
+  s.BindInt64(0, storage_key_int);
+
+  return s.Run();
+}
+
+bool TypedURLSyncMetadataDatabase::UpdateModelTypeState(
+    const sync_pb::ModelTypeState& model_type_state) {
+  DCHECK_GT(GetMetaTable()->GetVersionNumber(), 0);
+
+  std::string serialized_state = model_type_state.SerializeAsString();
+  return GetMetaTable()->SetValue(kTypedURLModelTypeStateKey, serialized_state);
+}
+
+bool TypedURLSyncMetadataDatabase::ClearModelTypeState() {
+  DCHECK_GT(GetMetaTable()->GetVersionNumber(), 0);
+  return GetMetaTable()->DeleteKey(kTypedURLModelTypeStateKey);
+}
+
+bool TypedURLSyncMetadataDatabase::InitSyncTable() {
+  if (!GetDB().DoesTableExist("typed_url_sync_metadata")) {
+    if (!GetDB().Execute("CREATE TABLE typed_url_sync_metadata ("
+                         "storage_key INTEGER PRIMARY KEY NOT NULL,"
+                         "value BLOB)")) {
+      NOTREACHED();
+      return false;
+    }
+  }
+  return true;
+}
+
+bool TypedURLSyncMetadataDatabase::GetAllSyncEntityMetadata(
+    syncer::EntityMetadataMap* metadata_records) {
+  sql::Statement s(GetDB().GetUniqueStatement(
+      "SELECT storage_key, value FROM typed_url_sync_metadata"));
+
+  while (s.Step()) {
+    std::string storage_key = base::Int64ToString(s.ColumnInt64(0));
+    std::string serialized_metadata = s.ColumnString(1);
+    sync_pb::EntityMetadata metadata_record;
+    if (metadata_record.ParseFromString(serialized_metadata)) {
+      metadata_records->insert(std::make_pair(storage_key, metadata_record));
+    } else {
+      return false;
+    }
+  }
+  return true;
+}
+
+bool TypedURLSyncMetadataDatabase::GetModelTypeState(
+    sync_pb::ModelTypeState* state) {
+  DCHECK_GT(GetMetaTable()->GetVersionNumber(), 0);
+  std::string serialized_state;
+  if (!GetMetaTable()->GetValue(kTypedURLModelTypeStateKey,
+                                &serialized_state)) {
+    return true;
+  }
+
+  return state->ParseFromString(serialized_state);
+}
+
+}  // namespace history