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quene #asyncio
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import asyncio | |
import itertools as it | |
import os | |
import random | |
import time | |
async def makeitem(size: int = 5) -> str: | |
return os.urandom(size).hex() | |
async def randsleep(a: int = 1, b: int = 5, caller=None) -> None: | |
i = random.randint(0, 10) | |
if caller: | |
print(f"{caller} sleeping for {i} seconds.") | |
await asyncio.sleep(i) | |
async def produce(name: int, q: asyncio.Queue) -> None: | |
n = random.randint(0, 10) | |
for _ in it.repeat(None, n): # Synchronous loop for each single producer | |
await randsleep(caller=f"Producer {name}") | |
i = await makeitem() | |
t = time.perf_counter() | |
await q.put((i, t)) | |
print(f"Producer {name} added <{i}> to queue.") | |
async def consume(name: int, q: asyncio.Queue) -> None: | |
while True: | |
await randsleep(caller=f"Consumer {name}") | |
i, t = await q.get() | |
now = time.perf_counter() | |
print(f"Consumer {name} got element <{i}>" | |
f" in {now-t:0.5f} seconds.") | |
q.task_done() | |
async def main(nprod: int, ncon: int): | |
q = asyncio.Queue() | |
producers = [asyncio.create_task(produce(n, q)) for n in range(nprod)] | |
consumers = [asyncio.create_task(consume(n, q)) for n in range(ncon)] | |
await asyncio.gather(*producers) | |
await q.join() # Implicitly awaits consumers, too | |
for c in consumers: | |
c.cancel() | |
if __name__ == "__main__": | |
import argparse | |
random.seed(444) | |
parser = argparse.ArgumentParser() | |
parser.add_argument("-p", "--nprod", type=int, default=5) | |
parser.add_argument("-c", "--ncon", type=int, default=10) | |
ns = parser.parse_args() | |
start = time.perf_counter() | |
asyncio.run(main(**ns.__dict__)) | |
elapsed = time.perf_counter() - start | |
print(f"Program completed in {elapsed:0.5f} seconds.") |
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