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<h1>Source code for airflow.utils.log.logging_mixin</h1><div class="highlight"><pre>
<span></span><span class="c1"># -*- coding: utf-8 -*-</span>
<span class="c1">#</span>
<span class="c1"># Licensed to the Apache Software Foundation (ASF) under one</span>
<span class="c1"># or more contributor license agreements. See the NOTICE file</span>
<span class="c1"># distributed with this work for additional information</span>
<span class="c1"># regarding copyright ownership. The ASF licenses this file</span>
<span class="c1"># to you under the Apache License, Version 2.0 (the</span>
<span class="c1"># &quot;License&quot;); you may not use this file except in compliance</span>
<span class="c1"># with the License. You may obtain a copy of the License at</span>
<span class="c1">#</span>
<span class="c1"># http://www.apache.org/licenses/LICENSE-2.0</span>
<span class="c1">#</span>
<span class="c1"># Unless required by applicable law or agreed to in writing,</span>
<span class="c1"># software distributed under the License is distributed on an</span>
<span class="c1"># &quot;AS IS&quot; BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY</span>
<span class="c1"># KIND, either express or implied. See the License for the</span>
<span class="c1"># specific language governing permissions and limitations</span>
<span class="c1"># under the License.</span>
<span class="c1">#</span>
<span class="kn">from</span> <span class="nn">__future__</span> <span class="k">import</span> <span class="n">absolute_import</span>
<span class="kn">from</span> <span class="nn">__future__</span> <span class="k">import</span> <span class="n">division</span>
<span class="kn">from</span> <span class="nn">__future__</span> <span class="k">import</span> <span class="n">print_function</span>
<span class="kn">from</span> <span class="nn">__future__</span> <span class="k">import</span> <span class="n">unicode_literals</span>
<span class="kn">import</span> <span class="nn">logging</span>
<span class="kn">import</span> <span class="nn">sys</span>
<span class="kn">import</span> <span class="nn">warnings</span>
<span class="kn">import</span> <span class="nn">six</span>
<span class="kn">from</span> <span class="nn">builtins</span> <span class="k">import</span> <span class="nb">object</span>
<span class="kn">from</span> <span class="nn">contextlib</span> <span class="k">import</span> <span class="n">contextmanager</span>
<span class="kn">from</span> <span class="nn">logging</span> <span class="k">import</span> <span class="n">Handler</span><span class="p">,</span> <span class="n">StreamHandler</span>
<div class="viewcode-block" id="LoggingMixin"><a class="viewcode-back" href="../../../../_api/airflow/executors/index.html#airflow.executors.LoggingMixin">[docs]</a><span class="k">class</span> <span class="nc">LoggingMixin</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;</span>
<span class="sd"> Convenience super-class to have a logger configured with the class name</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">context</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_set_context</span><span class="p">(</span><span class="n">context</span><span class="p">)</span>
<span class="c1"># We want to deprecate the logger property in Airflow 2.0</span>
<span class="c1"># The log property is the de facto standard in most programming languages</span>
<span class="nd">@property</span>
<span class="k">def</span> <span class="nf">logger</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="n">warnings</span><span class="o">.</span><span class="n">warn</span><span class="p">(</span>
<span class="s1">&#39;Initializing logger for </span><span class="si">{}</span><span class="s1"> using logger(), which will &#39;</span>
<span class="s1">&#39;be replaced by .log in Airflow 2.0&#39;</span><span class="o">.</span><span class="n">format</span><span class="p">(</span>
<span class="bp">self</span><span class="o">.</span><span class="vm">__class__</span><span class="o">.</span><span class="vm">__module__</span> <span class="o">+</span> <span class="s1">&#39;.&#39;</span> <span class="o">+</span> <span class="bp">self</span><span class="o">.</span><span class="vm">__class__</span><span class="o">.</span><span class="vm">__name__</span>
<span class="p">),</span>
<span class="ne">DeprecationWarning</span>
<span class="p">)</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">log</span>
<span class="nd">@property</span>
<span class="k">def</span> <span class="nf">log</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">try</span><span class="p">:</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">_log</span>
<span class="k">except</span> <span class="ne">AttributeError</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_log</span> <span class="o">=</span> <span class="n">logging</span><span class="o">.</span><span class="n">root</span><span class="o">.</span><span class="n">getChild</span><span class="p">(</span>
<span class="bp">self</span><span class="o">.</span><span class="vm">__class__</span><span class="o">.</span><span class="vm">__module__</span> <span class="o">+</span> <span class="s1">&#39;.&#39;</span> <span class="o">+</span> <span class="bp">self</span><span class="o">.</span><span class="vm">__class__</span><span class="o">.</span><span class="vm">__name__</span>
<span class="p">)</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">_log</span>
<span class="k">def</span> <span class="nf">_set_context</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">context</span><span class="p">):</span>
<span class="k">if</span> <span class="n">context</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span><span class="p">:</span>
<span class="n">set_context</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">log</span><span class="p">,</span> <span class="n">context</span><span class="p">)</span></div>
<span class="k">class</span> <span class="nc">StreamLogWriter</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span>
<span class="n">encoding</span> <span class="o">=</span> <span class="kc">False</span>
<span class="sd">&quot;&quot;&quot;</span>
<span class="sd"> Allows to redirect stdout and stderr to logger</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">logger</span><span class="p">,</span> <span class="n">level</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;</span>
<span class="sd"> :param log: The log level method to write to, ie. log.debug, log.warning</span>
<span class="sd"> :return:</span>
<span class="sd"> &quot;&quot;&quot;</span>
<span class="bp">self</span><span class="o">.</span><span class="n">logger</span> <span class="o">=</span> <span class="n">logger</span>
<span class="bp">self</span><span class="o">.</span><span class="n">level</span> <span class="o">=</span> <span class="n">level</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_buffer</span> <span class="o">=</span> <span class="nb">str</span><span class="p">()</span>
<span class="k">def</span> <span class="nf">write</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">message</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;</span>
<span class="sd"> Do whatever it takes to actually log the specified logging record</span>
<span class="sd"> :param message: message to log</span>
<span class="sd"> &quot;&quot;&quot;</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">message</span><span class="o">.</span><span class="n">endswith</span><span class="p">(</span><span class="s2">&quot;</span><span class="se">\n</span><span class="s2">&quot;</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_buffer</span> <span class="o">+=</span> <span class="n">message</span>
<span class="k">else</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_buffer</span> <span class="o">+=</span> <span class="n">message</span>
<span class="bp">self</span><span class="o">.</span><span class="n">logger</span><span class="o">.</span><span class="n">log</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">level</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">_buffer</span><span class="o">.</span><span class="n">rstrip</span><span class="p">())</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_buffer</span> <span class="o">=</span> <span class="nb">str</span><span class="p">()</span>
<span class="k">def</span> <span class="nf">flush</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;</span>
<span class="sd"> Ensure all logging output has been flushed</span>
<span class="sd"> &quot;&quot;&quot;</span>
<span class="k">if</span> <span class="nb">len</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_buffer</span><span class="p">)</span> <span class="o">&gt;</span> <span class="mi">0</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">logger</span><span class="o">.</span><span class="n">log</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">level</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">_buffer</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_buffer</span> <span class="o">=</span> <span class="nb">str</span><span class="p">()</span>
<span class="k">def</span> <span class="nf">isatty</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;</span>
<span class="sd"> Returns False to indicate the fd is not connected to a tty(-like) device.</span>
<span class="sd"> For compatibility reasons.</span>
<span class="sd"> &quot;&quot;&quot;</span>
<span class="k">return</span> <span class="kc">False</span>
<span class="k">class</span> <span class="nc">RedirectStdHandler</span><span class="p">(</span><span class="n">StreamHandler</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;</span>
<span class="sd"> This class is like a StreamHandler using sys.stderr/stdout, but always uses</span>
<span class="sd"> whatever sys.stderr/stderr is currently set to rather than the value of</span>
<span class="sd"> sys.stderr/stdout at handler construction time.</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">stream</span><span class="p">):</span>
<span class="k">if</span> <span class="ow">not</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">stream</span><span class="p">,</span> <span class="n">six</span><span class="o">.</span><span class="n">string_types</span><span class="p">):</span>
<span class="k">raise</span> <span class="ne">Exception</span><span class="p">(</span><span class="s2">&quot;Cannot use file like objects. Use &#39;stdout&#39; or &#39;stderr&#39;&quot;</span>
<span class="s2">&quot; as a str and without &#39;ext://&#39;.&quot;</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_use_stderr</span> <span class="o">=</span> <span class="kc">True</span>
<span class="k">if</span> <span class="s1">&#39;stdout&#39;</span> <span class="ow">in</span> <span class="n">stream</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_use_stderr</span> <span class="o">=</span> <span class="kc">False</span>
<span class="c1"># StreamHandler tries to set self.stream</span>
<span class="n">Handler</span><span class="o">.</span><span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span>
<span class="nd">@property</span>
<span class="k">def</span> <span class="nf">stream</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">_use_stderr</span><span class="p">:</span>
<span class="k">return</span> <span class="n">sys</span><span class="o">.</span><span class="n">stderr</span>
<span class="k">return</span> <span class="n">sys</span><span class="o">.</span><span class="n">stdout</span>
<span class="nd">@contextmanager</span>
<span class="k">def</span> <span class="nf">redirect_stdout</span><span class="p">(</span><span class="n">logger</span><span class="p">,</span> <span class="n">level</span><span class="p">):</span>
<span class="n">writer</span> <span class="o">=</span> <span class="n">StreamLogWriter</span><span class="p">(</span><span class="n">logger</span><span class="p">,</span> <span class="n">level</span><span class="p">)</span>
<span class="k">try</span><span class="p">:</span>
<span class="n">sys</span><span class="o">.</span><span class="n">stdout</span> <span class="o">=</span> <span class="n">writer</span>
<span class="k">yield</span>
<span class="k">finally</span><span class="p">:</span>
<span class="n">sys</span><span class="o">.</span><span class="n">stdout</span> <span class="o">=</span> <span class="n">sys</span><span class="o">.</span><span class="n">__stdout__</span>
<span class="nd">@contextmanager</span>
<span class="k">def</span> <span class="nf">redirect_stderr</span><span class="p">(</span><span class="n">logger</span><span class="p">,</span> <span class="n">level</span><span class="p">):</span>
<span class="n">writer</span> <span class="o">=</span> <span class="n">StreamLogWriter</span><span class="p">(</span><span class="n">logger</span><span class="p">,</span> <span class="n">level</span><span class="p">)</span>
<span class="k">try</span><span class="p">:</span>
<span class="n">sys</span><span class="o">.</span><span class="n">stderr</span> <span class="o">=</span> <span class="n">writer</span>
<span class="k">yield</span>
<span class="k">finally</span><span class="p">:</span>
<span class="n">sys</span><span class="o">.</span><span class="n">stderr</span> <span class="o">=</span> <span class="n">sys</span><span class="o">.</span><span class="n">__stderr__</span>
<span class="k">def</span> <span class="nf">set_context</span><span class="p">(</span><span class="n">logger</span><span class="p">,</span> <span class="n">value</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;</span>
<span class="sd"> Walks the tree of loggers and tries to set the context for each handler</span>
<span class="sd"> :param logger: logger</span>
<span class="sd"> :param value: value to set</span>
<span class="sd"> &quot;&quot;&quot;</span>
<span class="n">_logger</span> <span class="o">=</span> <span class="n">logger</span>
<span class="k">while</span> <span class="n">_logger</span><span class="p">:</span>
<span class="k">for</span> <span class="n">handler</span> <span class="ow">in</span> <span class="n">_logger</span><span class="o">.</span><span class="n">handlers</span><span class="p">:</span>
<span class="k">try</span><span class="p">:</span>
<span class="n">handler</span><span class="o">.</span><span class="n">set_context</span><span class="p">(</span><span class="n">value</span><span class="p">)</span>
<span class="k">except</span> <span class="ne">AttributeError</span><span class="p">:</span>
<span class="c1"># Not all handlers need to have context passed in so we ignore</span>
<span class="c1"># the error when handlers do not have set_context defined.</span>
<span class="k">pass</span>
<span class="k">if</span> <span class="n">_logger</span><span class="o">.</span><span class="n">propagate</span> <span class="ow">is</span> <span class="kc">True</span><span class="p">:</span>
<span class="n">_logger</span> <span class="o">=</span> <span class="n">_logger</span><span class="o">.</span><span class="n">parent</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">_logger</span> <span class="o">=</span> <span class="kc">None</span>
</pre></div>
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