2005-04-09 Richard Taylor <rjt-gramps@thegrindstone.me.uk>
* src/GrampsDBCallback.py: block recursive signal calls, improved error reporting. All warnings are now printed to stderr even if logging is turned off. svn: r4328
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Richard Taylor
parent
c987a9faff
commit
025bac3328
@ -1,3 +1,8 @@
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2005-04-09 Richard Taylor <rjt-gramps@thegrindstone.me.uk>
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* src/GrampsDBCallback.py: block recursive signal calls, improved error
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reporting. All warnings are now printed to stderr even if logging
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is turned off.
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2005-04-08 Don Allingham <don@gramps-project.org>
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* src/AddMedia.py: pychecker changes
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* src/ChooseParents.py: pychecker changes
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@ -234,6 +234,10 @@ class GrampsDBCallback(object):
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# containing the list of types of the arguments
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# that the callback methods must accept.
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self._current_key = 0 # counter to give a unique key to each callback.
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self._current_signals = [] # list of all the signals that are currently
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# being emitted by this instance. This is
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# used to prevent recursive emittion of the
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# same signal.
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# To speed up the signal type checking the signals declared by
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# each of the classes in the inheritance tree of this instance
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@ -326,66 +330,94 @@ class GrampsDBCallback(object):
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# Check signal exists
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if signal_name not in self.__signal_map.keys():
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self._log("Warning: attempt to emit to unknown signal: %s\n"
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" from: file: %s\n"
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" line: %d\n"
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" func: %s\n"
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% ((str(signal_name),) + inspect.stack()[1][1:4]))
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self._warn("Attempt to emit to unknown signal: %s\n"
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" from: file: %s\n"
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" line: %d\n"
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" func: %s\n"
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% ((str(signal_name),) + inspect.stack()[1][1:4]))
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return
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# type check arguments
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arg_types = self.__signal_map[signal_name]
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if arg_types == None and len(args) > 0:
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self._log("Warning: signal emitted with "
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"wrong number of args: %s\n"
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" from: file: %s\n"
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" line: %d\n"
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" func: %s\n"
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% ((str(signal_name),) + inspect.stack()[1][1:4]))
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# check that the signal is not already being emitted. This prevents
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# against recursive signal emmissions.
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if signal_name in self._current_signals:
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self._warn("Signal recursion blocked. "
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"Signals was : %s\n"
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" from: file: %s\n"
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" line: %d\n"
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" func: %s\n"
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% ((str(signal_name),) + inspect.stack()[1][1:4]))
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return
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if len(args) > 0:
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if len(args) != len(arg_types):
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self._log("Warning: signal emitted with "
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"wrong number of args: %s\n"
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" from: file: %s\n"
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" line: %d\n"
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" func: %s\n"
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% ((str(signal_name),) + inspect.stack()[1][1:4]))
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try:
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self._current_signals.append(signal_name)
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# check that args is a tuple. This is a common programming error.
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if not (isinstance(args,tuple) or args == None):
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self._warn("Signal emitted with argument that is not a tuple.\n"
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" emit() takes two arguments, the signal name and a \n"
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" tuple that contains the arguments that are to be \n"
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" passed to the callbacks. If you are passing a signal \n"
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" argument it must be done as a single element tuple \n"
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" e.g. emit('my-signal',(1,)) \n"
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" signal was: %s\n"
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" from: file: %s\n"
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" line: %d\n"
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" func: %s\n"
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% ((str(signal_name),) + inspect.stack()[1][1:4]))
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return
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if arg_types != None:
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for i in range(0,len(arg_types)):
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if not isinstance(args[i],arg_types[i]):
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self._log("Warning: signal emitted with "
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"wrong arg types: %s\n"
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" from: file: %s\n"
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" line: %d\n"
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" func: %s\n"
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% ((str(signal_name),) + inspect.stack()[1][1:4]))
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# type check arguments
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arg_types = self.__signal_map[signal_name]
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if arg_types == None and len(args) > 0:
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self._warn("Signal emitted with "
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"wrong number of args: %s\n"
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" from: file: %s\n"
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" line: %d\n"
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" func: %s\n"
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% ((str(signal_name),) + inspect.stack()[1][1:4]))
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return
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self._log(" arg passed was: %s, type of arg passed %s, type should be: %s\n"
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% (args[i],repr(type(args[i])),repr(arg_types[i])))
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return
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if len(args) > 0:
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if len(args) != len(arg_types):
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self._warn("Signal emitted with "
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"wrong number of args: %s\n"
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" from: file: %s\n"
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" line: %d\n"
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" func: %s\n"
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% ((str(signal_name),) + inspect.stack()[1][1:4]))
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return
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if signal_name in self.__callback_map.keys():
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self._log("emmitting signal: %s\n" % (signal_name,))
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# Don't bother if there are no callbacks.
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for (key,fn) in self.__callback_map[signal_name]:
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self._log("Calling callback with key: %s\n" % (key,))
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try:
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if type(fn) == tuple: # call class method
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cb[0](fn[1],*args)
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elif type(fn) == types.FunctionType or \
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type(fn) == types.MethodType: # call func
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fn(*args)
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else:
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self._log("Warning: badly formed entry in callback map.\n")
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except:
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log("%s: %s" % (self.__class__.__name__,
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"Warning: exception occured in callback function.\n"))
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log("%s: %s" % (self.__class__.__name__,
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"".join(traceback.format_exception(*sys.exc_info()))))
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if arg_types != None:
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for i in range(0,len(arg_types)):
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if not isinstance(args[i],arg_types[i]):
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self._warn("Signal emitted with "
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"wrong arg types: %s\n"
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" from: file: %s\n"
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" line: %d\n"
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" func: %s\n"
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" arg passed was: %s, type of arg passed %s, type should be: %s\n"
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% ((str(signal_name),) + inspect.stack()[1][1:4] +\
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(args[i],repr(type(args[i])),repr(arg_types[i]))))
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return
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if signal_name in self.__callback_map.keys():
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self._log("emmitting signal: %s\n" % (signal_name,))
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# Don't bother if there are no callbacks.
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for (key,fn) in self.__callback_map[signal_name]:
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self._log("Calling callback with key: %s\n" % (key,))
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try:
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if type(fn) == tuple: # call class method
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cb[0](fn[1],*args)
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elif type(fn) == types.FunctionType or \
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type(fn) == types.MethodType: # call func
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fn(*args)
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else:
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self._warn("Badly formed entry in callback map.\n")
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except:
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self._warn("Exception occured in callback function.\n"
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"%s" % ("".join(traceback.format_exception(*sys.exc_info())),))
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finally:
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self._current_signals.remove(signal_name)
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#
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# instance signals control methods
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@ -409,6 +441,9 @@ class GrampsDBCallback(object):
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if GrampsDBCallback.__LOG_ALL or self.__enable_logging:
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log("%s: %s" % (self.__class__.__name__, str(msg)))
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def _warn(self,msg):
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log("Warning: %s: %s" % (self.__class__.__name__, str(msg)))
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#
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# Class methods
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#
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@ -655,9 +690,70 @@ if __name__ == "__main__":
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res=[]
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def fn(s,r=res):
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res.append(s)
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t._log = fn
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t._warn = fn
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t.connect('test-lots',fn2), t.emit('test-lots',('a','a',[1,2],t,1.2))
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assert res[1][0:8] == "Warning:", "Type error not detected"
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assert res[0][0:6] == "Signal", "Type error not detected"
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def test_recursion_block(self):
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class TestSignals(GrampsDBCallback):
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__signals__ = {
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'test-recursion' : (GrampsDBCallback,)
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}
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def fn(cb):
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cb.emit('test-recursion',(t,))
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res=[]
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def fn2(s,r=res):
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res.append(s)
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t = TestSignals()
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t._warn = fn2
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t.connect('test-recursion',fn)
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try:
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t.emit('test-recursion',(t,))
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except RuntimeError:
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assert False, "signal recursion not blocked1."
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assert res[0][0:6] == "Signal", "signal recursion not blocked"
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def test_multisignal_recursion_block(self):
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class TestSignals(GrampsDBCallback):
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__signals__ = {
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'test-top' : (GrampsDBCallback,),
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'test-middle' : (GrampsDBCallback,),
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'test-bottom' : (GrampsDBCallback,)
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}
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def top(cb):
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cb.emit('test-middle',(t,))
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def middle(cb):
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cb.emit('test-bottom',(t,))
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def bottom(cb):
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cb.emit('test-top',(t,))
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res=[]
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def fn2(s,r=res):
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res.append(s)
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t = TestSignals()
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t._warn = fn2
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t.connect('test-top',top)
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t.connect('test-middle',middle)
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t.connect('test-bottom',bottom)
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try:
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t.emit('test-top',(t,))
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except RuntimeError:
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assert False, "multisignal recursion not blocked1."
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assert res[0][0:6] == "Signal", "multisignal recursion not blocked"
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unittest.main()
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