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Add async support

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This allows for async functions to be passed to the Flask class
instance, for example as a view function,

    @app.route("/")
    async def index():
        return "Async hello"

this comes with a cost though of poorer performance than using the
sync equivalent.

asgiref is the standard way to run async code within a sync context,
and is used in Django making it a safe and sane choice for this.
This commit is contained in:
pgjones 2020-07-06 20:54:26 +01:00 • committed by David Lord
parent 85b8fab268
commit 6979265fa6
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11 changed files with 165 additions and 9 deletions
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6
src/flask/app.py
View file

@ -1050,7 +1050,7 @@ class Flask(Scaffold):
"View function mapping is overwriting an existing"
f" endpoint function: {endpoint}"
)
self.view_functions[endpoint] = view_func
self.view_functions[endpoint] = self.ensure_sync(view_func)
@setupmethod
def template_filter(self, name=None):
@ -1165,7 +1165,7 @@ class Flask(Scaffold):
.. versionadded:: 0.8
"""
self.before_first_request_funcs.append(f)
self.before_first_request_funcs.append(self.ensure_sync(f))
return f
@setupmethod
@ -1198,7 +1198,7 @@ class Flask(Scaffold):
.. versionadded:: 0.9
"""
self.teardown_appcontext_funcs.append(f)
self.teardown_appcontext_funcs.append(self.ensure_sync(f))
return f
@setupmethod