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# Copyright 2013 Red Hat, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
"""Provides Guru Meditation Report
This module defines the actual OpenStack Guru Meditation
Report class.
This can be used in the OpenStack command definition files.
For example, in a nova command module (under nova/cmd):
.. code-block:: python
:emphasize-lines: 8,9,10
CONF = cfg.CONF
# maybe import some options here...
def main():
config.parse_args(sys.argv)
logging.setup('blah')
TextGuruMeditation.register_section('Some Special Section',
special_section_generator)
TextGuruMeditation.setup_autorun(version_object)
server = service.Service.create(binary='some-service',
topic=CONF.some_service_topic)
service.serve(server)
service.wait()
Then, you can do
.. code-block:: bash
$ kill -USR1 $SERVICE_PID
and get a Guru Meditation Report in the file or terminal
where stderr is logged for that given service.
"""
from __future__ import print_function
import inspect
import os
import signal
import sys
from oslo_utils import timeutils
from openstack.common.report.generators import conf as cgen
from openstack.common.report.generators import threading as tgen
from openstack.common.report.generators import version as pgen
from openstack.common.report import report
class GuruMeditation(object):
"""A Guru Meditation Report Mixin/Base Class
This class is a base class for Guru Meditation Reports.
It provides facilities for registering sections and
setting up functionality to auto-run the report on
a certain signal.
This class should always be used in conjunction with
a Report class via multiple inheritance. It should
always come first in the class list to ensure the
MRO is correct.
"""
timestamp_fmt = "%Y%m%d%H%M%S"
def __init__(self, version_obj, sig_handler_tb=None, *args, **kwargs):
self.version_obj = version_obj
self.traceback = sig_handler_tb
super(GuruMeditation, self).__init__(*args, **kwargs)
self.start_section_index = len(self.sections)
@classmethod
def register_section(cls, section_title, generator):
"""Register a New Section
This method registers a persistent section for the current
class.
:param str section_title: the title of the section
:param generator: the generator for the section
"""
try:
cls.persistent_sections.append([section_title, generator])
except AttributeError:
cls.persistent_sections = [[section_title, generator]]
@classmethod
def setup_autorun(cls, version, service_name=None,
log_dir=None, signum=None):
"""Set Up Auto-Run
This method sets up the Guru Meditation Report to automatically
get dumped to stderr or a file in a given dir when the given signal
is received.
:param version: the version object for the current product
:param service_name: this program name used to construct logfile name
:param logdir: path to a log directory where to create a file
:param signum: the signal to associate with running the report
"""
if not signum and hasattr(signal, 'SIGUSR1'):
# SIGUSR1 is not supported on all platforms
signum = signal.SIGUSR1
if signum:
signal.signal(signum,
lambda sn, tb: cls.handle_signal(
version, service_name, log_dir, tb))
@classmethod
def handle_signal(cls, version, service_name, log_dir, traceback):
"""The Signal Handler
This method (indirectly) handles receiving a registered signal and
dumping the Guru Meditation Report to stderr or a file in a given dir.
If service name and log dir are not None, the report will be dumped to
a file named $service_name_gurumeditation_$current_time in the log_dir
directory.
This method is designed to be curried into a proper signal handler by
currying out the version
parameter.
:param version: the version object for the current product
:param service_name: this program name used to construct logfile name
:param logdir: path to a log directory where to create a file
:param traceback: the traceback provided to the signal handler
"""
try:
res = cls(version, traceback).run()
except Exception:
print("Unable to run Guru Meditation Report!",
file=sys.stderr)
else:
if log_dir:
service_name = service_name or os.path.basename(
inspect.stack()[-1][1])
filename = "%s_gurumeditation_%s" % (
service_name, timeutils.strtime(fmt=cls.timestamp_fmt))
filepath = os.path.join(log_dir, filename)
try:
with open(filepath, "w") as dumpfile:
dumpfile.write(res)
except Exception:
print("Unable to dump Guru Meditation Report to file %s" %
(filepath,), file=sys.stderr)
else:
print(res, file=sys.stderr)
def _readd_sections(self):
del self.sections[self.start_section_index:]
self.add_section('Package',
pgen.PackageReportGenerator(self.version_obj))
self.add_section('Threads',
tgen.ThreadReportGenerator(self.traceback))
self.add_section('Green Threads',
tgen.GreenThreadReportGenerator())
self.add_section('Configuration',
cgen.ConfigReportGenerator())
try:
for section_title, generator in self.persistent_sections:
self.add_section(section_title, generator)
except AttributeError:
pass
def run(self):
self._readd_sections()
return super(GuruMeditation, self).run()
# GuruMeditation must come first to get the correct MRO
class TextGuruMeditation(GuruMeditation, report.TextReport):
"""A Text Guru Meditation Report
This report is the basic human-readable Guru Meditation Report
It contains the following sections by default
(in addition to any registered persistent sections):
- Package Information
- Threads List
- Green Threads List
- Configuration Options
:param version_obj: the version object for the current product
:param traceback: an (optional) frame object providing the actual
traceback for the current thread
"""
def __init__(self, version_obj, traceback=None):
super(TextGuruMeditation, self).__init__(version_obj, traceback,
'Guru Meditation')
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