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| import tornado | |
| class RequestContextHandler(tornado.web.RequestHandler): | |
| def _execute(self, transforms, *args, **kwargs): | |
| # following the example of: | |
| # https://github.com/bdarnell/tornado_tracing/blob/master/tornado_tracing/recording.py | |
| global_data = {} # add whatever here, e.g. self.request | |
| with tornado.stack_context.StackContext(functools.partial(ThreadRequestContext, **global_data)): | |
| super(RequestContextHandler, self)._execute(transforms, *args, **kwargs) | |
| # elsewhere, use ThreadRequestContext.data => a dict |
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| import threading | |
| class ThreadRequestContext(object): | |
| """A context manager that saves some per-thread state globally. | |
| Intended for use with Tornado's StackContext. | |
| Provide arbitrary data as kwargs upon creation, | |
| then use ThreadRequestContext.data to access it. | |
| """ | |
| _state = threading.local() | |
| _state.data = {} | |
| class __metaclass__(type): | |
| # property() doesn't work on classmethods, | |
| # see http://stackoverflow.com/q/128573/1231454 | |
| @property | |
| def data(cls): | |
| if not hasattr(cls._state, 'data'): | |
| return {} | |
| return cls._state.data | |
| def __init__(self, **data): | |
| self._data = data | |
| def __enter__(self): | |
| self._prev_data = self.__class__.data | |
| self.__class__._state.data = self._data | |
| def __exit__(self, *exc): | |
| self.__class__._state.data = self._prev_data | |
| del self._prev_data | |
| return False |
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