def from_settings(settings):
    """ Factory method that returns an instance of channel

        :param str connection_type: This field can be `blocking`
            `asyncore`, `libev`, `select`, `tornado`, or `twisted`

        See pika documentation for more details:
            TODO: put pika url regarding connection type

        Parameters is a dictionary that can
        include the following values:

            :param str host: Hostname or IP Address to connect to
            :param int port: TCP port to connect to
            :param str virtual_host: RabbitMQ virtual host to use
            :param pika.credentials.Credentials credentials: auth credentials
            :param int channel_max: Maximum number of channels to allow
            :param int frame_max: The maximum byte size for an AMQP frame
            :param int heartbeat_interval: How often to send heartbeats
            :param bool ssl: Enable SSL
            :param dict ssl_options: Arguments passed to ssl.wrap_socket as
            :param int connection_attempts: Maximum number of retry attempts
            :param int|float retry_delay: Time to wait in seconds, before the next
            :param int|float socket_timeout: Use for high latency networks
            :param str locale: Set the locale value
            :param bool backpressure_detection: Toggle backpressure detection

        :return: Channel object
    """

    connection_type = settings.get('RABBITMQ_CONNECTION_TYPE', RABBITMQ_CONNECTION_TYPE)
    queue_name = settings.get('RABBITMQ_QUEUE_NAME', RABBITMQ_QUEUE_NAME)
    connection_parameters = settings.get('RABBITMQ_CONNECTION_PARAMETERS', RABBITMQ_CONNECTION_PARAMETERS)

    connection = {
        'blocking': pika.BlockingConnection,
        'libev': pika.LibevConnection,
        'select': pika.SelectConnection,
        'tornado': pika.TornadoConnection,
        'twisted': pika.TwistedConnection
    }[connection_type](pika.ConnectionParameters(**connection_parameters))

    channel = connection.channel()
    channel.queue_declare(queue=queue_name, durable=True)

    return channel
Factory method that returns an instance of channel

        :param str connection_type: This field can be `blocking`
            `asyncore`, `libev`, `select`, `tornado`, or `twisted`

        See pika documentation for more details:
            TODO: put pika url regarding connection type

        Parameters is a dictionary that can
        include the following values:

            :param str host: Hostname or IP Address to connect to
            :param int port: TCP port to connect to
            :param str virtual_host: RabbitMQ virtual host to use
            :param pika.credentials.Credentials credentials: auth credentials
            :param int channel_max: Maximum number of channels to allow
            :param int frame_max: The maximum byte size for an AMQP frame
            :param int heartbeat_interval: How often to send heartbeats
            :param bool ssl: Enable SSL
            :param dict ssl_options: Arguments passed to ssl.wrap_socket as
            :param int connection_attempts: Maximum number of retry attempts
            :param int|float retry_delay: Time to wait in seconds, before the next
            :param int|float socket_timeout: Use for high latency networks
            :param str locale: Set the locale value
            :param bool backpressure_detection: Toggle backpressure detection

        :return: Channel object