choosereactor.py 文件源码

def install_reactor(explicit_reactor=None, verbose=False):
    """
    Install Twisted reactor.

    :param explicit_reactor: If provided, install this reactor. Else, install
        the optimal reactor.
    :type explicit_reactor: obj
    :param verbose: If ``True``, print what happens.
    :type verbose: bool
    """
    import sys

    log = txaio.make_logger()

    if explicit_reactor:
        # install explicitly given reactor
        ##
        from twisted.application.reactors import installReactor
        log.info("Trying to install explicitly specified Twisted reactor '{reactor}'", reactor=explicit_reactor)
        try:
            installReactor(explicit_reactor)
        except:
            log.failure("Could not install Twisted reactor {reactor}\n{log_failure.value}",
                        reactor=explicit_reactor)
            sys.exit(1)
    else:
        # automatically choose optimal reactor
        ##
        log.debug("Automatically choosing optimal Twisted reactor")
        install_optimal_reactor(verbose)

    # now the reactor is installed, import it
    from twisted.internet import reactor
    txaio.config.loop = reactor

    if verbose:
        from twisted.python.reflect import qual
        log.debug("Running Twisted reactor {reactor}", reactor=qual(reactor.__class__))

    return reactor