A library of composable Python executors
Project description
This library is intended for use with the `concurrent.futures <https://docs.python.org/3/library/concurrent.futures.html>`__ module. It includes a collection of Executor implementations in order to extend the behavior of Future objects.
Features
Futures with implicit retry
Futures with implicit cancel on executor shutdown
Futures with implicit cancel after timeout
Futures with transformed output values (sync & async)
Futures resolved by a caller-provided polling function
Throttle the number of futures running at once
Synchronous executor
Bridge concurrent.futures with asyncio
Convenience API for creating executors
See the API documentation for detailed information on usage.
Example
This example combines the map and retry executors to create futures for HTTP requests running concurrently, decoding JSON responses within the future and retrying on error.
import requests
from concurrent.futures import as_completed
from more_executors import Executors
def get_json(response):
response.raise_for_status()
return (response.url, response.json())
def fetch_urls(urls):
# Configure an executor:
# - run up to 4 requests concurrently, in separate threads
# - run get_json on each response
# - retry up to several minutes on any errors
executor = Executors.\
thread_pool(max_workers=4).\
with_map(get_json).\
with_retry()
# Submit requests for each given URL
futures = [executor.submit(requests.get, url)
for url in urls]
# Futures API works as normal; we can block on the completed
# futures and map/retry happens implicitly
for future in as_completed(futures):
(url, data) = future.result()
do_something(url, data)Changelog
v1.14.0
v1.13.0
Introduced Executors.bind
v1.12.0
Introduced FlatMapExecutor
v1.11.0
Fixed hangs on executor shutdown
v1.10.0
Improved RetryPolicy API
Fixed a race condition leading to RetryExecutor hangs
Added logger argument to each executor
v1.9.0
Introduced ThrottleExecutor
v1.8.0
Fixed missing long_description in package
v1.7.0
Revised TimeoutExecutor concept to “cancel after timeout”
Introduced AsyncioExecutor
v1.6.0
Introduce TimeoutExecutor
Use monotonic clock in RetryExecutor
Avoid some uninterruptible sleeps on Python 2.x
Minor improvements to logging
License
GPLv3
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