contrib/showstack.py

wireprotoserver: rename hgweb.protocol to wireprotoserver (API)

The HTTP wire protocol server / response handler is currently defined
in the hgweb sub-package. That only kind of makes sense. hgweb does
contain most of the HTTP server code. However, hgweb is more tailored
for providing HTTP server and WSGI scaffolding and serving hgweb
requests. The wire protocol is kind of its own beast.

In addition, the code for HTTP and SSH wire protocol handling is
actually pretty small and it needs to stay in sync to ensure parity
between the transport implementations.

We rename mercurial/hgweb/protocol.py to mercurial/wireprotoserver.py.
The new module will eventually become the home of the SSH handler
as well.

.. api::

   Content from mercurial.hgweb.protocol has been moved to
   mercurial.wireprotoserver.

Differential Revision: https://phab.mercurial-scm.org/D1965

# showstack.py - extension to dump a Python stack trace on signal
#
# binds to both SIGQUIT (Ctrl-\) and SIGINFO (Ctrl-T on BSDs)
"""dump stack trace when receiving SIGQUIT (Ctrl-\) and SIGINFO (Ctrl-T on BSDs)
"""

from __future__ import absolute_import
import signal
import sys
import traceback

def sigshow(*args):
    sys.stderr.write("\n")
    traceback.print_stack(args[1], limit=10, file=sys.stderr)
    sys.stderr.write("----\n")

def extsetup(ui):
    signal.signal(signal.SIGQUIT, sigshow)
    try:
        signal.signal(signal.SIGINFO, sigshow)
    except AttributeError:
        pass