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Distribute consumers evenly across worker nodes #8

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Distribute consumers evenly across worker nodes #8

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25 changes: 22 additions & 3 deletions eventbusk/cli.py
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Original file line number Diff line number Diff line change
Expand Up @@ -100,21 +100,40 @@ def reload(self) -> None:

@cli.command()
@click.option("--app", "-A", help="Path to EventBus instance. eg. 'mymodule:app'")
def worker(app: str) -> None:
@click.option("--worker-number", "-w", help="Worker instance number")
@click.option("--total-workers", "-n", help="Total number of worker nodes")
def worker(app: str, worker_number: int = 1, total_workers: int = 1) -> None:
"""
Start consumer workers
"""
bus = find_app(app)
receivers = bus.receivers
# Sort by name to distribute receivers evenly across worker instances
receivers: list[Callable] = sorted(
list(bus.receivers),
key=lambda receiver_fn: receiver_fn.__name__
)
if not receivers:
logger.error("No registered receivers to run.")
return

if worker_number < 0:
logger.error("Worker instance number cannot be less than 1")
return
if worker_number > total_workers:
logger.error("Worker instance number cannot be > total workers")

num_workers = len(receivers)
logger.info(f"Found {num_workers} receivers.")

# Every n-th receiver (n = total_workers) starting from `worker_number`
# will be run on current worker instance
worker_receivers = [
receivers[i-1]
for i in range(worker_number, total_workers + 1, total_workers)
]

manager = cotyledon.ServiceManager()
with cwd_in_path():
for receiver in receivers:
for receiver in worker_receivers:
manager.add(Worker, args=(receiver,))
manager.run()