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"""
Create spans from Django middleware invocations
"""
from django import VERSION as DJANGO_VERSION
from sentry_sdk import Hub
from sentry_sdk._functools import wraps
from sentry_sdk._types import MYPY
from sentry_sdk.utils import (
ContextVar,
transaction_from_function,
capture_internal_exceptions,
)
if MYPY:
from typing import Any
from typing import Callable
from typing import TypeVar
F = TypeVar("F", bound=Callable[..., Any])
_import_string_should_wrap_middleware = ContextVar(
"import_string_should_wrap_middleware"
)
if DJANGO_VERSION < (1, 7):
import_string_name = "import_by_path"
else:
import_string_name = "import_string"
def patch_django_middlewares():
# type: () -> None
from django.core.handlers import base
old_import_string = getattr(base, import_string_name)
def sentry_patched_import_string(dotted_path):
# type: (str) -> Any
rv = old_import_string(dotted_path)
if _import_string_should_wrap_middleware.get(None):
rv = _wrap_middleware(rv, dotted_path)
return rv
setattr(base, import_string_name, sentry_patched_import_string)
old_load_middleware = base.BaseHandler.load_middleware
def sentry_patched_load_middleware(*args, **kwargs):
# type: (Any, Any) -> Any
_import_string_should_wrap_middleware.set(True)
try:
return old_load_middleware(*args, **kwargs)
finally:
_import_string_should_wrap_middleware.set(False)
base.BaseHandler.load_middleware = sentry_patched_load_middleware
def _wrap_middleware(middleware, middleware_name):
# type: (Any, str) -> Any
from sentry_sdk.integrations.django import DjangoIntegration
def _get_wrapped_method(old_method):
# type: (F) -> F
with capture_internal_exceptions():
def sentry_wrapped_method(*args, **kwargs):
# type: (*Any, **Any) -> Any
hub = Hub.current
integration = hub.get_integration(DjangoIntegration)
if integration is None or not integration.middleware_spans:
return old_method(*args, **kwargs)
function_name = transaction_from_function(old_method)
description = middleware_name
function_basename = getattr(old_method, "__name__", None)
if function_basename:
description = "{}.{}".format(description, function_basename)
with hub.start_span(
op="django.middleware", description=description
) as span:
span.set_tag("django.function_name", function_name)
span.set_tag("django.middleware_name", middleware_name)
return old_method(*args, **kwargs)
try:
# fails for __call__ of function on Python 2 (see py2.7-django-1.11)
sentry_wrapped_method = wraps(old_method)(sentry_wrapped_method)
# Necessary for Django 3.1
sentry_wrapped_method.__self__ = old_method.__self__ # type: ignore
except Exception:
pass
return sentry_wrapped_method # type: ignore
return old_method
class SentryWrappingMiddleware(object):
def __init__(self, *args, **kwargs):
# type: (*Any, **Any) -> None
self._inner = middleware(*args, **kwargs)
self._call_method = None
# We need correct behavior for `hasattr()`, which we can only determine
# when we have an instance of the middleware we're wrapping.
def __getattr__(self, method_name):
# type: (str) -> Any
if method_name not in (
"process_request",
"process_view",
"process_template_response",
"process_response",
"process_exception",
):
raise AttributeError()
old_method = getattr(self._inner, method_name)
rv = _get_wrapped_method(old_method)
self.__dict__[method_name] = rv
return rv
def __call__(self, *args, **kwargs):
# type: (*Any, **Any) -> Any
f = self._call_method
if f is None:
self._call_method = f = _get_wrapped_method(self._inner.__call__)
return f(*args, **kwargs)
if hasattr(middleware, "__name__"):
SentryWrappingMiddleware.__name__ = middleware.__name__
return SentryWrappingMiddleware
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