code: def ensure_specifier_exists(db_spec):
      
      local_match = LOCAL_RE.match(db_spec)
      remote_match = REMOTE_RE.match(db_spec)
      plain_match = PLAIN_RE.match(db_spec)
      if local_match:
          db_name = local_match.groupdict().get('database')
          server = shortcuts.get_server()
          if db_name not in server:
              server.create(db_name)
          return True
      elif remote_match:
          hostname, portnum, database = map(remote_match.groupdict().get,
              ('hostname', 'portnum', 'database'))
          server = shortcuts.get_server(
              server_url=('http://%s:%s' % (hostname, portnum)))
          if database not in server:
              server.create(database)
          return True
      elif plain_match:
          db_name = plain_match.groupdict().get('database')
          server = shortcuts.get_server()
          if db_name not in server:
              server.create(db_name)
          return True
      return False
docs: Make sure a DB specifier exists, creating it if necessary.