Async to sync converter
Syncer is an async-to-sync converter for python.
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
At the command line:
$ pip install syncer
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)
More examples/use-cases will be found in test.
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