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 transformed output values
Futures with a default timeout
Futures resolved by a caller-provided polling function
Synchronous executor
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
v1.6.0 - 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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