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Sartika Aritonang
news
Commits
e57f3032
Commit
e57f3032
authored
4 years ago
by
Sartika Aritonang
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compatibility.py
stbi/Lib/site-packages/asgiref/compatibility.py
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stbi/Lib/site-packages/asgiref/compatibility.py
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e57f3032
import
asyncio
import
inspect
def
is_double_callable
(
application
):
"""
Tests to see if an application is a legacy-style (double-callable) application.
"""
# Look for a hint on the object first
if
getattr
(
application
,
"_asgi_single_callable"
,
False
):
return
False
if
getattr
(
application
,
"_asgi_double_callable"
,
False
):
return
True
# Uninstanted classes are double-callable
if
inspect
.
isclass
(
application
):
return
True
# Instanted classes depend on their __call__
if
hasattr
(
application
,
"__call__"
):
# We only check to see if its __call__ is a coroutine function -
# if it's not, it still might be a coroutine function itself.
if
asyncio
.
iscoroutinefunction
(
application
.
__call__
):
return
False
# Non-classes we just check directly
return
not
asyncio
.
iscoroutinefunction
(
application
)
def
double_to_single_callable
(
application
):
"""
Transforms a double-callable ASGI application into a single-callable one.
"""
async
def
new_application
(
scope
,
receive
,
send
):
instance
=
application
(
scope
)
return
await
instance
(
receive
,
send
)
return
new_application
def
guarantee_single_callable
(
application
):
"""
Takes either a single- or double-callable application and always returns it
in single-callable style. Use this to add backwards compatibility for ASGI
2.0 applications to your server/test harness/etc.
"""
if
is_double_callable
(
application
):
application
=
double_to_single_callable
(
application
)
return
application
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