Throttler
Zero-dependency Python package for easy throttling with asyncio support.
📝
Table of Contents
-
🎒 Install -
🛠 Usage Examples - 👨🏻💻 Author
-
💬 Contributing -
📝 License
🎒
Install
Just
pip install throttler
🛠
Usage Examples
All run-ready examples are here.
Throttler and ThrottlerSimultaneous
Throttler:
Context manager for limiting rate of accessing to context block.
from throttler import Throttler
# Limit to three calls per second
t = Throttler(rate_limit=3, period=1.0)
async with t:
pass
Or
import asyncio
from throttler import throttle
# Limit to three calls per second
@throttle(rate_limit=3, period=1.0)
async def task():
return await asyncio.sleep(0.1)
ThrottlerSimultaneous:
Context manager for limiting simultaneous count of accessing to context block.
from throttler import ThrottlerSimultaneous
# Limit to five simultaneous calls
t = ThrottlerSimultaneous(count=5)
async with t:
pass
Or
import asyncio
from throttler import throttle_simultaneous
# Limit to five simultaneous calls
@throttle_simultaneous(count=5)
async def task():
return await asyncio.sleep(0.1)
Simple Example
import asyncio
import time
from throttler import throttle
# Limit to two calls per second
@throttle(rate_limit=2, period=1.0)
async def task():
return await asyncio.sleep(0.1)
async def many_tasks(count: int):
coros = [task() for _ in range(count)]
for coro in asyncio.as_completed(coros):
_ = await coro
print(f'Timestamp: {time.time()}')
asyncio.run(many_tasks(10))
Result output:
Timestamp: 1585183394.8141203
Timestamp: 1585183394.8141203
Timestamp: 1585183395.830335
Timestamp: 1585183395.830335
Timestamp: 1585183396.8460555
Timestamp: 1585183396.8460555
...
API Example
import asyncio
import time
import aiohttp
from throttler import Throttler, ThrottlerSimultaneous
class SomeAPI:
api_url = 'https://example.com'
def __init__(self, throttler):
self.throttler = throttler
async def request(self, session: aiohttp.ClientSession):
async with self.throttler:
async with session.get(self.api_url) as resp:
return resp
async def many_requests(self, count: int):
async with aiohttp.ClientSession() as session:
coros = [self.request(session) for _ in range(count)]
for coro in asyncio.as_completed(coros):
response = await coro
print(f'{int(time.time())} | Result: {response.status}')
async def run():
# Throttler can be of any type
t = ThrottlerSimultaneous(count=5) # Five simultaneous requests
t = Throttler(rate_limit=10, period=3.0) # Ten requests in three seconds
api = SomeAPI(t)
await api.many_requests(100)
asyncio.run(run())
Result output:
1585182908 | Result: 200
1585182908 | Result: 200
1585182908 | Result: 200
1585182909 | Result: 200
1585182909 | Result: 200
1585182909 | Result: 200
1585182910 | Result: 200
1585182910 | Result: 200
1585182910 | Result: 200
...
ExecutionTimer
Context manager for time limiting of accessing to context block. Simply sleep
periodsecs before next accessing, not analog ofThrottler. Also it can align to start of minutes.
import time
from throttler import ExecutionTimer
et = ExecutionTimer(60, align_sleep=True)
while True:
with et:
print(time.asctime(), '|', time.time())
Or
import time
from throttler import execution_timer
@execution_timer(60, align_sleep=True)
def f():
print(time.asctime(), '|', time.time())
while True:
f()
Result output:
Thu Mar 26 00:56:17 2020 | 1585173377.1203406
Thu Mar 26 00:57:00 2020 | 1585173420.0006166
Thu Mar 26 00:58:00 2020 | 1585173480.002517
Thu Mar 26 00:59:00 2020 | 1585173540.001494
Timer
Context manager for pretty printing start, end, elapsed and average times.
import random
import time
from throttler import Timer
timer = Timer('My Timer', verbose=True)
for _ in range(3):
with timer:
time.sleep(random.random())
Or
import random
import time
from throttler import timer
@timer('My Timer', verbose=True)
def f():
time.sleep(random.random())
for _ in range(3):
f()
Result output:
#1 | My Timer | begin: 2020-03-26 01:46:07.648661
#1 | My Timer | end: 2020-03-26 01:46:08.382135, elapsed: 0.73 sec, average: 0.73 sec
#2 | My Timer | begin: 2020-03-26 01:46:08.382135
#2 | My Timer | end: 2020-03-26 01:46:08.599919, elapsed: 0.22 sec, average: 0.48 sec
#3 | My Timer | begin: 2020-03-26 01:46:08.599919
#3 | My Timer | end: 2020-03-26 01:46:09.083370, elapsed: 0.48 sec, average: 0.48 sec
👨🏻💻 Author
Ramzan Bekbulatov:
💬
Contributing
Contributions, issues and feature requests are welcome!
📝
License
This project is MIT licensed.
2.2k Jan 4, 2023
2.1k Jan 1, 2023
1.1k Jan 2, 2023
3.3k Jan 7, 2023
1 Oct 27, 2021
24 Mar 2, 2022
1 Jan 8, 2022
25.4k Dec 30, 2022
93 Nov 29, 2022
4.2k Dec 26, 2022
468 Jan 1, 2023
98 Nov 10, 2022
220 Jan 5, 2023
9.1k Jan 7, 2023
3.8k Jan 8, 2023
37 Dec 29, 2022
9 Nov 10, 2022
768 Dec 22, 2022
1 Jan 04, 2022
49 Dec 03, 2022
1 Feb 11, 2022
135 Dec 19, 2022
63 Dec 30, 2022
2 Dec 15, 2021
128 Jan 02, 2023
124 Nov 26, 2022
23 Dec 24, 2022
318 Dec 31, 2022
1.5k Jan 04, 2023
2.8k Jan 04, 2023
0 Sep 19, 2022
1 Jan 26, 2022
7 Dec 25, 2022
14 Dec 05, 2022