code: def _get_conn():
      '''
      Return a postgres connection.
      '''
      try:
          conn = psycopg2.connect(
                 host=__opts__['master_job_cache.postgres.host'],
                 user=__opts__['master_job_cache.postgres.user'],
                 password=__opts__['master_job_cache.postgres.passwd'],
                 database=__opts__['master_job_cache.postgres.db'],
                 port=__opts__['master_job_cache.postgres.port'])
      except psycopg2.OperationalError:
          log.error('Could not connect to SQL server: %s', sys.exc_info()[0])
          return None
      return conf _get_conn():
      '''
      Return a postgres connection.
      '''
      try:
          conn = psycopg2.connect(
                 host=__opts__['master_job_cache.postgres.host'],
                 user=__opts__['master_job_cache.postgres.user'],
                 password=__opts__['master_job_cache.postgres.passwd'],
                 database=__opts__['master_job_cache.postgres.db'],
                 port=__opts__['master_job_cache.postgres.port'])
      except psycopg2.OperationalError:
          log.error('Could not connect to SQL server: %s', sys.exc_info()[0])
          return None
      return conn
docs: Return a postgres connection.