upstream/ipython Files · IPython/zmq/log.py

inputhook: disable CTRL+C when a hook is active....

inputhook: disable CTRL+C when a hook is active. On systems with 'readline', it's very likely to intercept a signal during a select() call. The default SIGINT handler will schedule a KeyboardInterrupt exception to be raised as soon as possible. If ctypes is used to install a Python callback for PyOS_InputHook, this will happen as soon as the bytecode execution starts, so even if the first instruction of the callback is a `try: ... except KeyboardInterrupt` clause, it's actually too late. As ctypes doesn't allow a Python callback to raise an exception, this ends up with IPython detecting an internal error... not pretty. We must therefore ignore the SIGINT signals until we are sure the exception handler is active, in the Python callback.

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      import logging

      from logging import INFO, DEBUG, WARN, ERROR, FATAL

      import zmq

      from zmq.log.handlers import PUBHandler

      class EnginePUBHandler(PUBHandler):

          """A simple PUBHandler subclass that sets root_topic"""

          engine=None

          def __init__(self, engine, *args, **kwargs):

              PUBHandler.__init__(self,*args, **kwargs)

              self.engine = engine

          @property

          def root_topic(self):

              """this is a property, in case the handler is created

              before the engine gets registered with an id"""

              if isinstance(getattr(self.engine, 'id', None), int):

                  return "engine.%i"%self.engine.id

              else:

                  return "engine"

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				import logging
				from logging import INFO, DEBUG, WARN, ERROR, FATAL

				import zmq
				from zmq.log.handlers import PUBHandler

				class EnginePUBHandler(PUBHandler):
				"""A simple PUBHandler subclass that sets root_topic"""
				engine=None

				def __init__(self, engine, args, *kwargs):
				PUBHandler.__init__(self,args, *kwargs)
				self.engine = engine

				@property
				def root_topic(self):
				"""this is a property, in case the handler is created
				before the engine gets registered with an id"""
				if isinstance(getattr(self.engine, 'id', None), int):
				return "engine.%i"%self.engine.id
				else:
				return "engine"