[issue29615] SimpleXMLRPCDispatcher._dispatch mangles tracebacks when invoking RPC calls through _dispatch
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[issue29615] SimpleXMLRPCDispatcher._dispatch mangles tracebacks when invoking RPC calls through _dispatch
Changes by Petr MOTEJLEK : -- pull_requests: +392 ___ Python tracker <http://bugs.python.org/issue29615> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue29374] Doc bug: signal.sigwait and signal.sigtimedwait do not work outside the Main thread
New submission from Petr MOTEJLEK:
Hi,
The documentation for signal.signal() clearly states that it is only supposed
to be called on MainThread
However, it does not say so for the signal.sigwait() and neither
signal.sigtimedwait()
I think this is an error on the documentation side of things (unless I misread
it). When either signal.sigwait or signal.sigtimedwait are called outside
MainThread, they simply never catch any signals (signal.sigwait blocks
indefinitely)
I did not test this on Windows, but on both Linux and OS X the behavior is the
same
Consider the below simple code
import signal
import os
def sigwait():
print("Send me a signal, my PID is {p}".format(p=os.getpid()))
print("Got the signal: {i}".format(i=signal.sigwait((signal.SIGUSR1,
If sigwait() is called on MainThread and the process receives SIGUSR1, "Got the
signal: ..." gets printed. However, calling sigwait in a different thread
blocks the thread indefinitely. The behavior is the same with
signal.sigtimedwait() as well
--
assignee: docs@python
components: Documentation
messages: 286269
nosy: docs@python, p...@motejlek.net
priority: normal
severity: normal
status: open
title: Doc bug: signal.sigwait and signal.sigtimedwait do not work outside the
Main thread
type: behavior
versions: Python 3.4, Python 3.5, Python 3.6, Python 3.7
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[issue29615] SimpleXMLRPCDispatcher._dispatch mangles tracebacks when invoking RPC calls through _dispatch
New submission from Petr MOTEJLEK: Hello, We discovered that SimpleXMLRPCDispatcher mangles tracebacks printed from within the invoked RPC methods when an object that has _dispatch(method, params) defined has been registered with it Steps to reproduce - use https://docs.python.org/3.4/library/xmlrpc.server.html#xmlrpc.server.SimpleXMLRPCServer.register_instance and register within SimpleXMLRPCDispatcher an object with the _dispatch(method, params) method defined - invoke any RPC method that prints a traceback (perhaps raise an exception in it, catch it and use logging.exception to log it) --> the traceback will display a very strange looking KeyError (its value being the name of the invoked method) and then the actual exception that was fed into logging.exception The reason for this is that SimpleXMLRPCDispatcher._dispatch first attempts to acquire the function to invoke by reading from the functions registered with the dispatcher. When this attempt fails, KeyError is raised. During its handling different approaches are taken to acquire the function and for all but one when the function is acquired, handling of the KeyError ends and the function is called properly, outside of the except block However, in the case of objects that define the _dispatch(method, params) function, the _dispatch(method, params) function is called straight away, still within the except block handling the KeyError, and this leads to the mangled traceback This behavior is neither documented, nor expected (we believe) and thus the code should be changed Will submit a PR (incl. tests) for this later on -- components: Library (Lib) messages: 288319 nosy: p...@motejlek.net priority: normal severity: normal status: open title: SimpleXMLRPCDispatcher._dispatch mangles tracebacks when invoking RPC calls through _dispatch versions: Python 3.4, Python 3.5, Python 3.6, Python 3.7 ___ Python tracker <http://bugs.python.org/issue29615> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue29615] SimpleXMLRPCDispatcher._dispatch mangles tracebacks when invoking RPC calls through _dispatch
Changes by Petr MOTEJLEK : -- pull_requests: +231 ___ Python tracker <http://bugs.python.org/issue29615> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
