88 lines
2.9 KiB
ReStructuredText
88 lines
2.9 KiB
ReStructuredText
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Copyright (c) 2016 OpenStack Foundation
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Licensed under the Apache License, Version 2.0 (the "License"); you may
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not use this file except in compliance with the License. You may obtain
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a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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License for the specific language governing permissions and limitations
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under the License.
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Guru Meditation Reports
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=======================
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Dragonflow contains a mechanism whereby developers and system administrators
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can generate a report about the state of a running Dragonflow executable.
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This report is called a *Guru Meditation Report* (*GMR* for short).
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Generating a GMR
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----------------
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A *GMR* can be generated by sending the *USR2* signal to any Dragonflow process
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with support (see below).
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The *GMR* will then be outputted standard error for that particular process.
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For example, suppose that ``df-local-controller`` has process id ``2525``, and
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was run with ``2>/var/log/dragonflow/df-controller.log``. Then,
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``kill -USR2 2525`` will trigger the Guru Meditation report to be printed to
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``/var/log/dragonflow/df-controller.log``.
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Structure of a GMR
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------------------
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The *GMR* is designed to be extensible; any particular executable may add its
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own sections. However, the base *GMR* consists of several sections:
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Package
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Shows information about the package to which this process belongs, including
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version information
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Threads
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Shows stack traces and thread ids for each of the threads within this process
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Green Threads
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Shows stack traces for each of the green threads within this process (green
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threads don't have thread ids)
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Configuration
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Lists all the configuration options currently accessible via the CONF object
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for the current process
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Adding Support for GMRs to New Executables
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------------------------------------------
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Adding support for a *GMR* to a given executable is fairly easy.
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First import the module, as well as the Dragonflow version module:
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.. code-block:: python
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from oslo_reports import guru_meditation_report as gmr
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from dragonflow import version
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Then, register any additional sections (optional):
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.. code-block:: python
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TextGuruMeditation.register_section('Some Special Section',
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some_section_generator)
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Finally (under main), before running the "main loop" of the executable,
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register the *GMR* hook:
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.. code-block:: python
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TextGuruMeditation.setup_autorun(version)
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Extending the GMR
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-----------------
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As mentioned above, additional sections can be added to the GMR for a
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particular executable.
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For more information, see the inline documentation under :mod:`oslo.reports`
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