class PipelineServer(ManagedService):
    """ Thin wrapper around PipelineServer constructs.

    Allows controlled start and stop of the web app server
    in a separate process.

    Parameters
    ----------
    config : yaml
        reference to the yaml configuration file

    """
    def __init__(self, config):
        self.config = config
        self.pipeline_server_job = None
        self._restarting = threading.Event()

    def trigger_event(self, event: config_mgm.ConfigChangedEvent):
        """Trigger change event on pipelines not running. 
        Pipelines already runnig are already notified by rective configurations

        """
        if self.pipeline_server_job is None:
            return

        if self._restarting.is_set():
            return

        self._restarting.set()
        self.stop()
        self.start()
        self._restarting.clear()

    def start(self, **kwargs):
        log.info('PipelineServer server job starting...')
        f = PipelineServerJob(self.config)
        self.pipeline_server_job = ThreadedJob(f)
        self.pipeline_server_job.start()
        log.info('Pipeline server job started')

    def healthcheck(self):
        return time.monotonic(), True

    def heal(self):
        """Heal the server.

        TODO: Keep an eye for potential scenarios that cause this server to
         become unresponsive.
        """

    def stop(self):
        if self.pipeline_server_job:
            log.info('Pipeline server job stopping...')
            self.pipeline_server_job.stop()
            self.pipeline_server_job.join()
            self.pipeline_server_job = None
            log.info('Pipeline server job stopped.')
Beispiel #2
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class PipelineServer(ManagedService):
    """Thin wrapper around PipelineServer constructs.

    Allows controlled start and stop of the web app server
    in a separate process.

    Parameters
    ----------
    config : yaml
        reference to the yaml configuration file

    """

    def __init__(self, config):
        self.config = config
        self.pipeline_server_job = None

    def start(self, **kwargs):
        log.info("PipelineServer server job starting...")
        f = PipelineServerJob(self.config)
        self.pipeline_server_job = ThreadedJob(f)
        self.pipeline_server_job.start()
        log.info("Pipeline server job started")

    def healthcheck(self):
        return time.monotonic(), True

    def heal(self):
        """Heal the server.

        TODO: Keep an eye for potential scenarios that cause this server to
         become unresponsive.
        """

    def stop(self):
        if self.pipeline_server_job:
            log.info("Pipeline server job stopping...")
            try:
                self.pipeline_server_job.stop()
                self.pipeline_server_job.join()
            except RuntimeError as err:
                log.warning("Failed stopping: %s" % err)
            self.pipeline_server_job = None
            log.info("Pipeline server job stopped.")
Beispiel #3
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class FlaskServer(ManagedService):
    """ Thin wrapper around Flask constructs.

    Allows controlled start and stop of the web app server
    in a separate process.

    Parameters
    ----------
    config : yaml
        reference to the yaml configuration file

    """

    def __init__(self, config):
        self.config = config
        self.flask_job = None

    def start(self, **kwargs):
        log.info('Flask server job starting...')
        f = FlaskJob(self.config)
        self.flask_job = ThreadedJob(f)
        self.flask_job.start()
        log.info('Flask server job started')

    def healthcheck(self):
        # Note: Implement actual health check for Flask
        # See if the /healthcheck URL returns a 200 quickly
        return time.monotonic(), True

    def heal(self):
        """Heal the server.

        TODO: Keep an eye for potential scenarios that cause this server to
         become unresponsive.
        """

    def stop(self):
        if self.flask_job:
            log.info('Flask server job stopping...')
            self.flask_job.stop()
            self.flask_job.join()
            log.info('Flask server job stopped.')