Vendor DataLoader from aiodataloader and move get_event_loop() out of __init__ function.
#1459
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@@ Coverage Diff @@
## master #1459 +/- ##
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+ Coverage 95.44% 95.72% +0.27%
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Files 49 50 +1
Lines 1582 1683 +101
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+ Hits 1510 1611 +101
Misses 72 72
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flipbit03
changed the title
DataLoader from aiodataloader and move get_event_loop() out of __init__ function.DataLoader from aiodataloader and move get_event_loop() out of __init__ function.
flipbit03
commented
Sep 5, 2022
| @@ -2,6 +2,10 @@ | |||
| exclude = setup.py,docs/*,*/examples/*,graphene/pyutils/*,tests | |||
| max-line-length = 120 | |||
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| # This is a specific ignore for Black+Flake8 | |||
| # source: https://black.readthedocs.io/en/stable/guides/using_black_with_other_tools.html#id1 | |||
| extend-ignore = E203 | |||
There was a problem hiding this comment.
without this line, flake8 was constantly clashing with black over array slice notation whitespacing rules.
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Seems like |
…avior from `__init__` to a property which only gets resolved when actually needed (this will solve PyTest-related early get_event_loop() issues)
…executed by pytest.
…ility to pass in a custom event loop, if needed.
erikwrede
approved these changes
Sep 6, 2022
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DataLoaders are trying to get the asyncio's event loop too early (on
__init__) and this is generating problems like making pytest + async unusable. Since there is no event loop at that moment, the first DataLoader instantiated is actually creating a new event loop. This generates the infamous "Future tied to a different loop" problem many people are facing.In this PR, we are:
aiodataloader'sDataLoaderclass into theutils/moduleget_event_loopout of the class' initializer and into a property which only gets called when actually needed, offsetting the chicken-and-egg problem we are dealing with.The base for this work is dataloader.py, which is MIT Licensed code from Syrus Akbary