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Update Lorax documentation - 23.13 Add documentation for the new monitor and mount modules.
2015-07-10 18:39:39 +00:00
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<h1>Source code for pylorax.monitor</h1><div class="highlight"><pre>
<span class="c"># monitor.py</span>
<span class="c">#</span>
<span class="c"># Copyright (C) 2011-2015 Red Hat, Inc.</span>
<span class="c">#</span>
<span class="c"># This program is free software; you can redistribute it and/or modify</span>
<span class="c"># it under the terms of the GNU General Public License as published by</span>
<span class="c"># the Free Software Foundation; either version 2 of the License, or</span>
<span class="c"># (at your option) any later version.</span>
<span class="c">#</span>
<span class="c"># This program is distributed in the hope that it will be useful,</span>
<span class="c"># but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
<span class="c"># MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</span>
<span class="c"># GNU General Public License for more details.</span>
<span class="c">#</span>
<span class="c"># You should have received a copy of the GNU General Public License</span>
<span class="c"># along with this program. If not, see &lt;http://www.gnu.org/licenses/&gt;.</span>
<span class="c">#</span>
<span class="c"># Author(s): Brian C. Lane &lt;bcl@redhat.com&gt;</span>
<span class="c">#</span>
<span class="kn">import</span> <span class="nn">logging</span>
<span class="n">log</span> <span class="o">=</span> <span class="n">logging</span><span class="o">.</span><span class="n">getLogger</span><span class="p">(</span><span class="s">&quot;livemedia-creator&quot;</span><span class="p">)</span>
<span class="kn">import</span> <span class="nn">re</span>
<span class="kn">import</span> <span class="nn">socket</span>
<span class="kn">import</span> <span class="nn">socketserver</span>
<span class="kn">import</span> <span class="nn">threading</span>
<span class="kn">import</span> <span class="nn">time</span>
<div class="viewcode-block" id="LogRequestHandler"><a class="viewcode-back" href="../../pylorax.html#pylorax.monitor.LogRequestHandler">[docs]</a><span class="k">class</span> <span class="nc">LogRequestHandler</span><span class="p">(</span><span class="n">socketserver</span><span class="o">.</span><span class="n">BaseRequestHandler</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;</span>
<span class="sd"> Handle monitoring and saving the logfiles from the virtual install</span>
<span class="sd"> Incoming data is written to self.server.log_path and each line is checked</span>
<span class="sd"> for patterns that would indicate that the installation failed.</span>
<span class="sd"> self.server.log_error is set True when this happens.</span>
<span class="sd"> &quot;&quot;&quot;</span>
<div class="viewcode-block" id="LogRequestHandler.setup"><a class="viewcode-back" href="../../pylorax.html#pylorax.monitor.LogRequestHandler.setup">[docs]</a> <span class="k">def</span> <span class="nf">setup</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;Start writing to self.server.log_path&quot;&quot;&quot;</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">server</span><span class="o">.</span><span class="n">log_path</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">fp</span> <span class="o">=</span> <span class="nb">open</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">server</span><span class="o">.</span><span class="n">log_path</span><span class="p">,</span> <span class="s">&quot;w&quot;</span><span class="p">)</span> <span class="c"># pylint: disable=attribute-defined-outside-init</span>
<span class="k">else</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">fp</span> <span class="o">=</span> <span class="bp">None</span>
<span class="bp">self</span><span class="o">.</span><span class="n">request</span><span class="o">.</span><span class="n">settimeout</span><span class="p">(</span><span class="mi">10</span><span class="p">)</span>
</div>
<div class="viewcode-block" id="LogRequestHandler.handle"><a class="viewcode-back" href="../../pylorax.html#pylorax.monitor.LogRequestHandler.handle">[docs]</a> <span class="k">def</span> <span class="nf">handle</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;</span>
<span class="sd"> Write incoming data to a logfile and check for errors</span>
<span class="sd"> Split incoming data into lines and check for any Tracebacks or other</span>
<span class="sd"> errors that indicate that the install failed.</span>
<span class="sd"> Loops until self.server.kill is True</span>
<span class="sd"> &quot;&quot;&quot;</span>
<span class="n">log</span><span class="o">.</span><span class="n">info</span><span class="p">(</span><span class="s">&quot;Processing logs from </span><span class="si">%s</span><span class="s">&quot;</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">client_address</span><span class="p">)</span>
<span class="n">line</span> <span class="o">=</span> <span class="s">&quot;&quot;</span>
<span class="k">while</span> <span class="bp">True</span><span class="p">:</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">server</span><span class="o">.</span><span class="n">kill</span><span class="p">:</span>
<span class="k">break</span>
<span class="k">try</span><span class="p">:</span>
<span class="n">data</span> <span class="o">=</span> <span class="nb">str</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">request</span><span class="o">.</span><span class="n">recv</span><span class="p">(</span><span class="mi">4096</span><span class="p">),</span> <span class="s">&quot;utf8&quot;</span><span class="p">)</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">fp</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">fp</span><span class="o">.</span><span class="n">write</span><span class="p">(</span><span class="n">data</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">fp</span><span class="o">.</span><span class="n">flush</span><span class="p">()</span>
<span class="c"># check the data for errors and set error flag</span>
<span class="c"># need to assemble it into lines so we can test for the error</span>
<span class="c"># string.</span>
<span class="k">while</span> <span class="n">data</span><span class="p">:</span>
<span class="n">more</span> <span class="o">=</span> <span class="n">data</span><span class="o">.</span><span class="n">split</span><span class="p">(</span><span class="s">&quot;</span><span class="se">\n</span><span class="s">&quot;</span><span class="p">,</span> <span class="mi">1</span><span class="p">)</span>
<span class="n">line</span> <span class="o">+=</span> <span class="n">more</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span>
<span class="k">if</span> <span class="nb">len</span><span class="p">(</span><span class="n">more</span><span class="p">)</span> <span class="o">&gt;</span> <span class="mi">1</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">iserror</span><span class="p">(</span><span class="n">line</span><span class="p">)</span>
<span class="n">line</span> <span class="o">=</span> <span class="s">&quot;&quot;</span>
<span class="n">data</span> <span class="o">=</span> <span class="n">more</span><span class="p">[</span><span class="mi">1</span><span class="p">]</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">data</span> <span class="o">=</span> <span class="bp">None</span>
<span class="k">except</span> <span class="n">socket</span><span class="o">.</span><span class="n">timeout</span><span class="p">:</span>
<span class="k">pass</span>
<span class="k">except</span> <span class="ne">Exception</span> <span class="k">as</span> <span class="n">e</span><span class="p">:</span> <span class="c"># pylint: disable=broad-except</span>
<span class="n">log</span><span class="o">.</span><span class="n">info</span><span class="p">(</span><span class="s">&quot;log processing killed by exception: </span><span class="si">%s</span><span class="s">&quot;</span><span class="p">,</span> <span class="n">e</span><span class="p">)</span>
<span class="k">break</span>
</div>
<div class="viewcode-block" id="LogRequestHandler.finish"><a class="viewcode-back" href="../../pylorax.html#pylorax.monitor.LogRequestHandler.finish">[docs]</a> <span class="k">def</span> <span class="nf">finish</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="n">log</span><span class="o">.</span><span class="n">info</span><span class="p">(</span><span class="s">&quot;Shutting down log processing&quot;</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">request</span><span class="o">.</span><span class="n">close</span><span class="p">()</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">fp</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">fp</span><span class="o">.</span><span class="n">close</span><span class="p">()</span>
</div>
<div class="viewcode-block" id="LogRequestHandler.iserror"><a class="viewcode-back" href="../../pylorax.html#pylorax.monitor.LogRequestHandler.iserror">[docs]</a> <span class="k">def</span> <span class="nf">iserror</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">line</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;</span>
<span class="sd"> Check a line to see if it contains an error indicating installation failure</span>
<span class="sd"> :param str line: log line to check for failure</span>
<span class="sd"> If the line contains IGNORED it will be skipped.</span>
<span class="sd"> &quot;&quot;&quot;</span>
<span class="k">if</span> <span class="s">&quot;IGNORED&quot;</span> <span class="ow">in</span> <span class="n">line</span><span class="p">:</span>
<span class="k">return</span>
<span class="n">simple_tests</span> <span class="o">=</span> <span class="p">[</span><span class="s">&quot;Traceback (&quot;</span><span class="p">,</span>
<span class="s">&quot;Out of memory:&quot;</span><span class="p">,</span>
<span class="s">&quot;Call Trace:&quot;</span><span class="p">,</span>
<span class="s">&quot;insufficient disk space:&quot;</span><span class="p">,</span>
<span class="s">&quot;error populating transaction after&quot;</span><span class="p">,</span>
<span class="s">&quot;traceback script(s) have been run&quot;</span><span class="p">,</span>
<span class="s">&quot;packaging: Missed: NoSuchPackage&quot;</span><span class="p">]</span>
<span class="n">re_tests</span> <span class="o">=</span> <span class="p">[</span><span class="s">r&quot;packaging: base repo .* not valid&quot;</span><span class="p">,</span>
<span class="s">r&quot;packaging: .* requires .*&quot;</span><span class="p">]</span>
<span class="k">for</span> <span class="n">t</span> <span class="ow">in</span> <span class="n">simple_tests</span><span class="p">:</span>
<span class="k">if</span> <span class="n">t</span> <span class="ow">in</span> <span class="n">line</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">server</span><span class="o">.</span><span class="n">log_error</span> <span class="o">=</span> <span class="bp">True</span>
<span class="bp">self</span><span class="o">.</span><span class="n">server</span><span class="o">.</span><span class="n">error_line</span> <span class="o">=</span> <span class="n">line</span>
<span class="k">return</span>
<span class="k">for</span> <span class="n">t</span> <span class="ow">in</span> <span class="n">re_tests</span><span class="p">:</span>
<span class="k">if</span> <span class="n">re</span><span class="o">.</span><span class="n">search</span><span class="p">(</span><span class="n">t</span><span class="p">,</span> <span class="n">line</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">server</span><span class="o">.</span><span class="n">log_error</span> <span class="o">=</span> <span class="bp">True</span>
<span class="bp">self</span><span class="o">.</span><span class="n">server</span><span class="o">.</span><span class="n">error_line</span> <span class="o">=</span> <span class="n">line</span>
<span class="k">return</span>
</div></div>
<div class="viewcode-block" id="LogServer"><a class="viewcode-back" href="../../pylorax.html#pylorax.monitor.LogServer">[docs]</a><span class="k">class</span> <span class="nc">LogServer</span><span class="p">(</span><span class="n">socketserver</span><span class="o">.</span><span class="n">TCPServer</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;A TCP Server that listens for log data&quot;&quot;&quot;</span>
<span class="c"># Number of seconds to wait for a connection after startup</span>
<span class="n">timeout</span> <span class="o">=</span> <span class="mi">60</span>
<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">log_path</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;</span>
<span class="sd"> Setup the log server</span>
<span class="sd"> :param str log_path: Path to the log file to write</span>
<span class="sd"> &quot;&quot;&quot;</span>
<span class="bp">self</span><span class="o">.</span><span class="n">kill</span> <span class="o">=</span> <span class="bp">False</span>
<span class="bp">self</span><span class="o">.</span><span class="n">log_error</span> <span class="o">=</span> <span class="bp">False</span>
<span class="bp">self</span><span class="o">.</span><span class="n">error_line</span> <span class="o">=</span> <span class="s">&quot;&quot;</span>
<span class="bp">self</span><span class="o">.</span><span class="n">log_path</span> <span class="o">=</span> <span class="n">log_path</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_timeout</span> <span class="o">=</span> <span class="n">kwargs</span><span class="o">.</span><span class="n">pop</span><span class="p">(</span><span class="s">&quot;timeout&quot;</span><span class="p">,</span> <span class="bp">None</span><span class="p">)</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">_timeout</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_start_time</span> <span class="o">=</span> <span class="n">time</span><span class="o">.</span><span class="n">time</span><span class="p">()</span>
<span class="n">socketserver</span><span class="o">.</span><span class="n">TCPServer</span><span class="o">.</span><span class="n">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">)</span>
<div class="viewcode-block" id="LogServer.log_check"><a class="viewcode-back" href="../../pylorax.html#pylorax.monitor.LogServer.log_check">[docs]</a> <span class="k">def</span> <span class="nf">log_check</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;</span>
<span class="sd"> Check to see if an error has been found in the log</span>
<span class="sd"> :returns: True if there has been an error</span>
<span class="sd"> :rtype: bool</span>
<span class="sd"> &quot;&quot;&quot;</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">_timeout</span><span class="p">:</span>
<span class="n">taking_too_long</span> <span class="o">=</span> <span class="n">time</span><span class="o">.</span><span class="n">time</span><span class="p">()</span> <span class="o">&gt;</span> <span class="bp">self</span><span class="o">.</span><span class="n">_start_time</span> <span class="o">+</span> <span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_timeout</span> <span class="o">*</span> <span class="mi">60</span><span class="p">)</span>
<span class="k">if</span> <span class="n">taking_too_long</span><span class="p">:</span>
<span class="n">log</span><span class="o">.</span><span class="n">error</span><span class="p">(</span><span class="s">&quot;Canceling installation due to timeout&quot;</span><span class="p">)</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">taking_too_long</span> <span class="o">=</span> <span class="bp">False</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">log_error</span> <span class="ow">or</span> <span class="n">taking_too_long</span>
</div></div>
<div class="viewcode-block" id="LogMonitor"><a class="viewcode-back" href="../../pylorax.html#pylorax.monitor.LogMonitor">[docs]</a><span class="k">class</span> <span class="nc">LogMonitor</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;</span>
<span class="sd"> Setup a server to monitor the logs output by the installation</span>
<span class="sd"> This needs to be running before the virt-install runs, it expects</span>
<span class="sd"> there to be a listener on the port used for the virtio log port.</span>
<span class="sd"> &quot;&quot;&quot;</span>
<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">log_path</span><span class="o">=</span><span class="bp">None</span><span class="p">,</span> <span class="n">host</span><span class="o">=</span><span class="s">&quot;localhost&quot;</span><span class="p">,</span> <span class="n">port</span><span class="o">=</span><span class="mi">0</span><span class="p">,</span> <span class="n">timeout</span><span class="o">=</span><span class="bp">None</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;</span>
<span class="sd"> Start a thread to monitor the logs.</span>
<span class="sd"> :param str log_path: Path to the logfile to write</span>
<span class="sd"> :param str host: Host to bind to. Default is localhost.</span>
<span class="sd"> :param int port: Port to listen to or 0 to pick a port</span>
<span class="sd"> If 0 is passed for the port the dynamically assigned port will be</span>
<span class="sd"> available as self.port</span>
<span class="sd"> If log_path isn&#39;t set then it only monitors the logs, instead of</span>
<span class="sd"> also writing them to disk.</span>
<span class="sd"> &quot;&quot;&quot;</span>
<span class="bp">self</span><span class="o">.</span><span class="n">server</span> <span class="o">=</span> <span class="n">LogServer</span><span class="p">(</span><span class="n">log_path</span><span class="p">,</span> <span class="p">(</span><span class="n">host</span><span class="p">,</span> <span class="n">port</span><span class="p">),</span> <span class="n">LogRequestHandler</span><span class="p">,</span> <span class="n">timeout</span><span class="o">=</span><span class="n">timeout</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">host</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">port</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">server</span><span class="o">.</span><span class="n">server_address</span>
<span class="bp">self</span><span class="o">.</span><span class="n">log_path</span> <span class="o">=</span> <span class="n">log_path</span>
<span class="bp">self</span><span class="o">.</span><span class="n">server_thread</span> <span class="o">=</span> <span class="n">threading</span><span class="o">.</span><span class="n">Thread</span><span class="p">(</span><span class="n">target</span><span class="o">=</span><span class="bp">self</span><span class="o">.</span><span class="n">server</span><span class="o">.</span><span class="n">handle_request</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">server_thread</span><span class="o">.</span><span class="n">daemon</span> <span class="o">=</span> <span class="bp">True</span>
<span class="bp">self</span><span class="o">.</span><span class="n">server_thread</span><span class="o">.</span><span class="n">start</span><span class="p">()</span>
<div class="viewcode-block" id="LogMonitor.shutdown"><a class="viewcode-back" href="../../pylorax.html#pylorax.monitor.LogMonitor.shutdown">[docs]</a> <span class="k">def</span> <span class="nf">shutdown</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;Force shutdown of the monitoring thread&quot;&quot;&quot;</span>
<span class="bp">self</span><span class="o">.</span><span class="n">server</span><span class="o">.</span><span class="n">kill</span> <span class="o">=</span> <span class="bp">True</span>
<span class="bp">self</span><span class="o">.</span><span class="n">server_thread</span><span class="o">.</span><span class="n">join</span><span class="p">()</span></div></div>
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