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42 lines
1.1 KiB
Python
42 lines
1.1 KiB
Python
"""Background worker: drains a queue of jobs."""
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import argparse
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import logging
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import time
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from collections import deque
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log = logging.getLogger("worker")
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def process(job: dict) -> str:
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kind = job.get("kind")
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if kind == "email":
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return f"sent email to {job['to']}"
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if kind == "report":
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return f"built report {job['name']}"
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raise ValueError(f"unknown job kind: {kind!r}")
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def run(queue: deque, once: bool = False) -> int:
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done = 0
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while queue:
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job = queue.popleft()
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try:
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log.info(process(job))
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done += 1
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except ValueError as e: # TODO: dead-letter queue
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log.warning("skipping job: %s", e)
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if once:
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break
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time.sleep(0.01)
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return done
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if __name__ == "__main__":
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parser = argparse.ArgumentParser()
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parser.add_argument("--once", action="store_true")
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args = parser.parse_args()
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logging.basicConfig(level=logging.INFO)
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jobs = deque([{"kind": "email", "to": "dev@example.com"}, {"kind": "report", "name": "weekly"}, {"kind": "?"}])
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print(f"processed {run(jobs, args.once)} job(s)")
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