old_contents: # Copyright 2017 Vector Creations Ltd
  #
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  #
  #     http://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  
  import logging
  
  from synapse.storage.prepare_database import get_statements
  from synapse.storage.engines import PostgresEngine, Sqlite3Engine
  
  logger = logging.getLogger(__name__)
  
  
  BOTH_TABLES = """
  CREATE TABLE user_directory_stream_pos (
      Lock CHAR(1) NOT NULL DEFAULT 'X' UNIQUE,  -- Makes sure this table only has one row.
      stream_id BIGINT,
      CHECK (Lock='X')
  );
  
  INSERT INTO user_directory_stream_pos (stream_id) VALUES (null);
  
  CREATE TABLE user_directory (
      user_id TEXT NOT NULL,
      room_id TEXT NOT NULL,  -- A room_id that we know is public
      display_name TEXT,
      avatar_url TEXT
  );
  
  CREATE INDEX user_directory_room_idx ON user_directory(room_id);
  CREATE INDEX user_directory_user_idx ON user_directory(user_id);
  """
  
  
  POSTGRES_TABLE = """
  CREATE TABLE user_directory_search (
      user_id TEXT NOT NULL,
      vector tsvector
  );
  
  CREATE INDEX user_directory_search_fts_idx ON user_directory_search USING gin(vector);
  CREATE INDEX user_directory_search_user_idx ON user_directory_search(user_id);
  """
  
  
  SQLITE_TABLE = """
  CREATE VIRTUAL TABLE user_directory_search
      USING fts4 ( user_id, value );
  """
  
  
  def run_create(cur, database_engine, *args, **kwargs):
      for statement in get_statements(BOTH_TABLES.splitlines()):
          cur.execute(statement)
  
      if isinstance(database_engine, PostgresEngine):
          for statement in get_statements(POSTGRES_TABLE.splitlines()):
              cur.execute(statement)
      elif isinstance(database_engine, Sqlite3Engine):
          for statement in get_statements(SQLITE_TABLE.splitlines()):
              cur.execute(statement)
      else:
          raise Exception("Unrecognized database engine")
  
  
  def run_upgrade(*args, **kwargs):
      pass
  
new_contents: # Copyright 2017 Vector Creations Ltd
  #
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  #
  #     http://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  
  import logging
  
  from synapse.storage.prepare_database import get_statements
  from synapse.storage.engines import PostgresEngine, Sqlite3Engine
  
  logger = logging.getLogger(__name__)
  
  
  BOTH_TABLES = """
  CREATE TABLE user_directory_stream_pos (
      Lock CHAR(1) NOT NULL DEFAULT 'X' UNIQUE,  -- Makes sure this table only has one row.
      stream_id BIGINT,
      CHECK (Lock='X')
  );
  
  INSERT INTO user_directory_stream_pos (stream_id) VALUES (null);
  
  CREATE TABLE user_directory (
      user_id TEXT NOT NULL,
      room_id TEXT NOT NULL,  -- A room_id that we know is public
      display_name TEXT,
      avatar_url TEXT
  );
  
  CREATE INDEX user_directory_room_idx ON user_directory(room_id);
  CREATE UNIQUE INDEX user_directory_user_idx ON user_directory(user_id);
  """
  
  
  POSTGRES_TABLE = """
  CREATE TABLE user_directory_search (
      user_id TEXT NOT NULL,
      vector tsvector
  );
  
  CREATE INDEX user_directory_search_fts_idx ON user_directory_search USING gin(vector);
  CREATE UNIQUE INDEX user_directory_search_user_idx ON user_directory_search(user_id);
  """
  
  
  SQLITE_TABLE = """
  CREATE VIRTUAL TABLE user_directory_search
      USING fts4 ( user_id, value );
  """
  
  
  def run_create(cur, database_engine, *args, **kwargs):
      for statement in get_statements(BOTH_TABLES.splitlines()):
          cur.execute(statement)
  
      if isinstance(database_engine, PostgresEngine):
          for statement in get_statements(POSTGRES_TABLE.splitlines()):
              cur.execute(statement)
      elif isinstance(database_engine, Sqlite3Engine):
          for statement in get_statements(SQLITE_TABLE.splitlines()):
              cur.execute(statement)
      else:
          raise Exception("Unrecognized database engine")
  
  
  def run_upgrade(*args, **kwargs):
      pass
  
subject: Use unique indices