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Better exception handling (#2128)

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* WIP for better exception handling

* Note about removal

* resolve conditional to reduce lookups

* Cleanup logic
This commit is contained in:
Adam Hopkins 2021-06-21 14:14:07 +03:00 committed by GitHub
parent 5bb9aa0c2c
commit 80fca9aef7
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1 changed files with 15 additions and 9 deletions
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20
sanic/handlers.py
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@ -25,7 +25,6 @@ class ErrorHandler:
handlers = None
cached_handlers = None
_missing = object()
def __init__(self):
self.handlers = []
@ -45,7 +44,9 @@ class ErrorHandler:
:return: None
"""
# self.handlers to be deprecated and removed in version 21.12
self.handlers.append((exception, handler))
self.cached_handlers[exception] = handler
def lookup(self, exception):
"""
@ -61,13 +62,18 @@ class ErrorHandler:
:return: Registered function if found ``None`` otherwise
"""
handler = self.cached_handlers.get(type(exception), self._missing)
if handler is self._missing:
for exception_class, handler in self.handlers:
if isinstance(exception, exception_class):
self.cached_handlers[type(exception)] = handler
exception_class = type(exception)
if exception_class in self.cached_handlers:
return self.cached_handlers[exception_class]
for ancestor in type.mro(exception_class):
if ancestor in self.cached_handlers:
handler = self.cached_handlers[ancestor]
self.cached_handlers[exception_class] = handler
return handler
self.cached_handlers[type(exception)] = None
if ancestor is BaseException:
break
self.cached_handlers[exception_class] = None
handler = None
return handler