A library of composable Python executors and futures
Project description
more-executors
This library is intended for use with the
concurrent.futures
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.futureswithasyncio - 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)
Development
virtualenv and pip may be used to locally install this project from
source:
virtualenv ~/dev/python
. ~/dev/python/bin/activate
git clone https://github.com/rohanpm/more-executors
cd more-executors
pip install --editable .
Autotests may be run with pytest:
pip install -r test-requirements.txt
py.test
Submit pull requests against https://github.com/rohanpm/more-executors.
License
This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
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