Manage coroutine execution speed
Project description
Execute coroutines with limitations. Take a look at following examples.
Uniform and steady execution
Let’s imagine we have some service. We want to get something like 10k results from that server. While we don’t want to cost trouble target server we can use Pulemet with rps parameter. It will run just rps requests per second. And we won’t damage server. Also, we may need to use pool_size parameter if server doesn’t answer fast enough. That parameter will prevent creating new connections above the limit if current still working.
import asyncio
from pulemet import Pulemet
async def http_request(t: float = 0):
"""Let's say we go somewhere by http here."""
await asyncio.sleep(t)
return 1
async def sum_results(coros):
s = 0
for elem in asyncio.as_completed(coros):
s += await elem
return s
pulemet = Pulemet(rps=1, pool_size=20)
coroutines = pulemet.process([http_request() for _ in range(10)])
result = asyncio.get_event_loop().run_until_complete(sum_results(coroutines))
Functions and retries
You can run some async function with list of arguments and catch certain exceptions and even try call it again(few times). All of these in following example.
import asyncio
from pulemet import Pulemet
async def func(ind):
await asyncio.sleep(0.001)
if ind % 2 == 0:
raise ValueError
return ind
def main():
pulemet = Pulemet(rps=10)
coros_pulemet = pulemet.process_funcs(
coro_func=func,
coros_kwargs=({'ind': i} for i in range(0, 20)),
exceptions=(ValueError,),
exceptions_max=5,
)
coroutines = asyncio.gather(*coros_pulemet, return_exceptions=True)
asyncio.get_event_loop().run_until_complete(coroutines)
if __name__ == '__main__':
main()
Progress Bar Integration
That example explain how you can see execution progress this tqdm.
import asyncio
from tqdm.auto import tqdm
from pulemet import Pulemet
async def target(t: float = 0):
await asyncio.sleep(t)
return 1
async def sum_results(coros):
s = 0
for elem in asyncio.as_completed(coros):
s += await elem
return s
pulemet = Pulemet(rps=1, pbar=tqdm)
coroutines = pulemet.process([target() for _ in range(10)])
result = asyncio.get_event_loop().run_until_complete(sum_results(coroutines))
You will see something like that.
Total: 0it [00:00, ?it/s]
Per second: 0it [00:00, ?it/s]
Total: 0%| | 0/10 [00:00<?, ?it/s]
Total: 20%|██ | 2/10 [00:01<00:04, 1.99it/s]
Total: 30%|███ | 3/10 [00:02<00:04, 1.40it/s]
Total: 40%|████ | 4/10 [00:03<00:04, 1.22it/s]
Total: 50%|█████ | 5/10 [00:04<00:04, 1.13it/s]
Total: 60%|██████ | 6/10 [00:05<00:03, 1.08it/s]
Total: 70%|███████ | 7/10 [00:06<00:02, 1.05it/s]
Total: 80%|████████ | 8/10 [00:07<00:01, 1.04it/s]
Total: 90%|█████████ | 9/10 [00:08<00:00, 1.02it/s]
Total: 100%|██████████| 10/10 [00:09<00:00, 1.02it/s]
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