The syncer from icodein

syncer's Introduction

Syncer

https://codecov.io/github/miyakogi/syncer/coverage.svg?branch=master

Syncer is an async-to-sync converter for python.

PyPI: https://pypi.python.org/pypi/syncer/
Documentation: https://miyakogi.github.io/syncer/
Source code: https://github.com/miyakogi/syncer/

Features

Sometimes (mainly in test) we need to convert asynchronous functions to normal, synchronous functions and run them synchronously. It can be done by ayncio.get_event_loop().run_until_complete(), but it's quite long...

Syncer makes this conversion easy.

Convert coroutine-function (defined by aync def) to normal (synchronous) function
Run coroutines synchronously
Support both async def and decorator (@asyncio.coroutine) style

Install

At the command line:

$ pip install syncer

Usage

This module has only one function: syncer.sync.

from syncer import sync
async def async_fun():
    ...
    return 1
b = sync(async_fun)  # now b is synchronous
assert 1 == b()

To test the above async_fun in asynchronous test functions:

import unittest

class TestA(unittest.TestCase):
    # ``sync`` can be used as decorator.
    # The decorated function becomes synchronous.
    @sync
    async def test_async_fun(self):
        self.assertEqual(await async_fun(), 1)

Or, keep test functions synchronous and get results synchronously:

class TestA(unittest.TestCase):
    def test_async_fun(self):
        # run coroutine and return the result
        self.assertEqual(sync(async_fun()), 1)
        # This is equivalent to below, just a shortcut
        self.assertEqual(
            asyncio.get_event_loop().run_until_complete(async_fun()), 1)