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from inspect import iscoroutinefunction, markcoroutinefunction
from asgiref.sync import sync_to_async
__all__ = ["MiddlewareMixin"]
class MiddlewareMixin:
sync_capable = True
async_capable = True
def __init__(self, get_response):
if get_response is None:
raise ValueError("get_response must be provided.")
self.get_response = get_response
# If get_response is a coroutine function, turns us into async mode so
# a thread is not consumed during a whole request.
self.async_mode = iscoroutinefunction(self.get_response)
if self.async_mode:
# Mark the class as async-capable, but do the actual switch inside
# __call__ to avoid swapping out dunder methods.
markcoroutinefunction(self)
super().__init__()
def __repr__(self):
return "<%s get_response=%s>" % (
self.__class__.__qualname__,
getattr(
self.get_response,
"__qualname__",
self.get_response.__class__.__name__,
),
)
def __call__(self, request):
# Exit out to async mode, if needed
if self.async_mode:
return self.__acall__(request)
response = None
if hasattr(self, "process_request"):
response = self.process_request(request)
response = response or self.get_response(request)
if hasattr(self, "process_response"):
response = self.process_response(request, response)
return response
async def __acall__(self, request):
"""
Async version of __call__ that is swapped in when an async request
is running.
"""
response = None
if hasattr(self, "process_request"):
response = await sync_to_async(
self.process_request,
thread_sensitive=True,
)(request)
response = response or await self.get_response(request)
if hasattr(self, "process_response"):
response = await sync_to_async(
self.process_response,
thread_sensitive=True,
)(request, response)
return response
|
