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pika_listener.py
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pika_listener.py
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# Copyright (C) 2020 The Software Heritage developers
# See the AUTHORS file at the top-level directory of this distribution
# License: GNU General Public License version 3, or any later version
# See top-level LICENSE file for more information
import json
import logging
import sys
import pika
from swh.core.statsd import statsd
from swh.scheduler import get_scheduler
from swh.scheduler.utils import utcnow
logger = logging.getLogger(__name__)
def get_listener(broker_url, queue_name, scheduler_backend):
connection = pika.BlockingConnection(pika.URLParameters(broker_url))
channel = connection.channel()
channel.queue_declare(queue=queue_name, durable=True)
exchange = "celeryev"
routing_key = "#"
channel.queue_bind(queue=queue_name, exchange=exchange, routing_key=routing_key)
channel.basic_qos(prefetch_count=1000)
channel.basic_consume(
queue=queue_name, on_message_callback=get_on_message(scheduler_backend),
)
return channel
def get_on_message(scheduler_backend):
def on_message(channel, method_frame, properties, body):
try:
events = json.loads(body)
except Exception:
logger.warning("Could not parse body %r", body)
events = []
if not isinstance(events, list):
events = [events]
for event in events:
logger.debug("Received event %r", event)
process_event(event, scheduler_backend)
channel.basic_ack(delivery_tag=method_frame.delivery_tag)
return on_message
def process_event(event, scheduler_backend):
uuid = event.get("uuid")
if not uuid:
return
event_type = event["type"]
statsd.increment(
"swh_scheduler_listener_handled_event_total", tags={"event_type": event_type}
)
if event_type == "task-started":
scheduler_backend.start_task_run(
uuid, timestamp=utcnow(), metadata={"worker": event.get("hostname")},
)
elif event_type == "task-result":
result = event["result"]
status = None
if isinstance(result, dict) and "status" in result:
status = result["status"]
if status == "success":
status = "eventful" if result.get("eventful") else "uneventful"
if status is None:
status = "eventful" if result else "uneventful"
scheduler_backend.end_task_run(
uuid, timestamp=utcnow(), status=status, result=result
)
elif event_type == "task-failed":
scheduler_backend.end_task_run(uuid, timestamp=utcnow(), status="failed")
if __name__ == "__main__":
url = sys.argv[1]
logging.basicConfig(level=logging.DEBUG)
scheduler_backend = get_scheduler("local", args={"db": "service=swh-scheduler"})
channel = get_listener(url, "celeryev.test", scheduler_backend)
logger.info("Start consuming")
channel.start_consuming()

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