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logging.html

logging.html 13 KB
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  9.     <title>flask.logging &#8212; proxypool  documentation</title>
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    28. 

  28.     <link rel="top" title="proxypool  documentation" href="../../index.html" />
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  29.     <link rel="up" title="Module code" href="../index.html" />
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  30.    
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    35. 

  35. 

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  37.   <body role="document">
    38. 

  38.   
    39. 

  39. 

  40.     <div class="document">
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  42.         <div class="bodywrapper">
    43. 

  43.           <div class="body" role="main">
    44. 

  44.             
    45. 

  45.   <h1>Source code for flask.logging</h1><div class="highlight"><pre>
    46. 

  46. <span></span><span class="c1"># -*- coding: utf-8 -*-</span>
    47. 

  47. <span class="sd">&quot;&quot;&quot;</span>
    48. 

  48. <span class="sd">    flask.logging</span>
    49. 

  49. <span class="sd">    ~~~~~~~~~~~~~</span>
    50. 

  50. 

  51. <span class="sd">    Implements the logging support for Flask.</span>
    52. 

  52. 

  53. <span class="sd">    :copyright: (c) 2015 by Armin Ronacher.</span>
    54. 

  54. <span class="sd">    :license: BSD, see LICENSE for more details.</span>
    55. 

  55. <span class="sd">&quot;&quot;&quot;</span>
    56. 

  56. 

  57. <span class="kn">from</span> <span class="nn">__future__</span> <span class="k">import</span> <span class="n">absolute_import</span>
    58. 

  58. 

  59. <span class="kn">import</span> <span class="nn">sys</span>
    60. 

  60. 

  61. <span class="kn">from</span> <span class="nn">werkzeug.local</span> <span class="k">import</span> <span class="n">LocalProxy</span>
    62. 

  62. <span class="kn">from</span> <span class="nn">logging</span> <span class="k">import</span> <span class="n">getLogger</span><span class="p">,</span> <span class="n">StreamHandler</span><span class="p">,</span> <span class="n">Formatter</span><span class="p">,</span> <span class="n">getLoggerClass</span><span class="p">,</span> \
    63. 

  63.      <span class="n">DEBUG</span><span class="p">,</span> <span class="n">ERROR</span>
    64. 

  64. <span class="kn">from</span> <span class="nn">.globals</span> <span class="k">import</span> <span class="n">_request_ctx_stack</span>
    65. 

  65. 

  66. 

  67. <span class="n">PROD_LOG_FORMAT</span> <span class="o">=</span> <span class="s1">&#39;[</span><span class="si">%(asctime)s</span><span class="s1">] </span><span class="si">%(levelname)s</span><span class="s1"> in </span><span class="si">%(module)s</span><span class="s1">: </span><span class="si">%(message)s</span><span class="s1">&#39;</span>
    68. 

  68. <span class="n">DEBUG_LOG_FORMAT</span> <span class="o">=</span> <span class="p">(</span>
    69. 

  69.     <span class="s1">&#39;-&#39;</span> <span class="o">*</span> <span class="mi">80</span> <span class="o">+</span> <span class="s1">&#39;</span><span class="se">\n</span><span class="s1">&#39;</span> <span class="o">+</span>
    70. 

  70.     <span class="s1">&#39;</span><span class="si">%(levelname)s</span><span class="s1"> in </span><span class="si">%(module)s</span><span class="s1"> [</span><span class="si">%(pathname)s</span><span class="s1">:</span><span class="si">%(lineno)d</span><span class="s1">]:</span><span class="se">\n</span><span class="s1">&#39;</span> <span class="o">+</span>
    71. 

  71.     <span class="s1">&#39;</span><span class="si">%(message)s</span><span class="se">\n</span><span class="s1">&#39;</span> <span class="o">+</span>
    72. 

  72.     <span class="s1">&#39;-&#39;</span> <span class="o">*</span> <span class="mi">80</span>
    73. 

  73. <span class="p">)</span>
    74. 

  74. 

  75. 

  76. <span class="nd">@LocalProxy</span>
    77. 

  77. <span class="k">def</span> <span class="nf">_proxy_stream</span><span class="p">():</span>
    78. 

  78.     <span class="sd">&quot;&quot;&quot;Finds the most appropriate error stream for the application.  If a</span>
    79. 

  79. <span class="sd">    WSGI request is in flight we log to wsgi.errors, otherwise this resolves</span>
    80. 

  80. <span class="sd">    to sys.stderr.</span>
    81. 

  81. <span class="sd">    &quot;&quot;&quot;</span>
    82. 

  82.     <span class="n">ctx</span> <span class="o">=</span> <span class="n">_request_ctx_stack</span><span class="o">.</span><span class="n">top</span>
    83. 

  83.     <span class="k">if</span> <span class="n">ctx</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span><span class="p">:</span>
    84. 

  84.         <span class="k">return</span> <span class="n">ctx</span><span class="o">.</span><span class="n">request</span><span class="o">.</span><span class="n">environ</span><span class="p">[</span><span class="s1">&#39;wsgi.errors&#39;</span><span class="p">]</span>
    85. 

  85.     <span class="k">return</span> <span class="n">sys</span><span class="o">.</span><span class="n">stderr</span>
    86. 

  86. 

  87. 

  88. <span class="k">def</span> <span class="nf">_should_log_for</span><span class="p">(</span><span class="n">app</span><span class="p">,</span> <span class="n">mode</span><span class="p">):</span>
    89. 

  89.     <span class="n">policy</span> <span class="o">=</span> <span class="n">app</span><span class="o">.</span><span class="n">config</span><span class="p">[</span><span class="s1">&#39;LOGGER_HANDLER_POLICY&#39;</span><span class="p">]</span>
    90. 

  90.     <span class="k">if</span> <span class="n">policy</span> <span class="o">==</span> <span class="n">mode</span> <span class="ow">or</span> <span class="n">policy</span> <span class="o">==</span> <span class="s1">&#39;always&#39;</span><span class="p">:</span>
    91. 

  91.         <span class="k">return</span> <span class="kc">True</span>
    92. 

  92.     <span class="k">return</span> <span class="kc">False</span>
    93. 

  93. 

  94. 

  95. <div class="viewcode-block" id="create_logger"><a class="viewcode-back" href="../../flask/flask.html#flask.logging.create_logger">[docs]</a><span class="k">def</span> <span class="nf">create_logger</span><span class="p">(</span><span class="n">app</span><span class="p">):</span>
    96. 

  96.     <span class="sd">&quot;&quot;&quot;Creates a logger for the given application.  This logger works</span>
    97. 

  97. <span class="sd">    similar to a regular Python logger but changes the effective logging</span>
    98. 

  98. <span class="sd">    level based on the application&#39;s debug flag.  Furthermore this</span>
    99. 

  99. <span class="sd">    function also removes all attached handlers in case there was a</span>
    100. 

  100. <span class="sd">    logger with the log name before.</span>
    101. 

  101. <span class="sd">    &quot;&quot;&quot;</span>
    102. 

  102.     <span class="n">Logger</span> <span class="o">=</span> <span class="n">getLoggerClass</span><span class="p">()</span>
    103. 

  103. 

  104.     <span class="k">class</span> <span class="nc">DebugLogger</span><span class="p">(</span><span class="n">Logger</span><span class="p">):</span>
    105. 

  105.         <span class="k">def</span> <span class="nf">getEffectiveLevel</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
    106. 

  106.             <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">level</span> <span class="o">==</span> <span class="mi">0</span> <span class="ow">and</span> <span class="n">app</span><span class="o">.</span><span class="n">debug</span><span class="p">:</span>
    107. 

  107.                 <span class="k">return</span> <span class="n">DEBUG</span>
    108. 

  108.             <span class="k">return</span> <span class="n">Logger</span><span class="o">.</span><span class="n">getEffectiveLevel</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span>
    109. 

  109. 

  110.     <span class="k">class</span> <span class="nc">DebugHandler</span><span class="p">(</span><span class="n">StreamHandler</span><span class="p">):</span>
    111. 

  111.         <span class="k">def</span> <span class="nf">emit</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">record</span><span class="p">):</span>
    112. 

  112.             <span class="k">if</span> <span class="n">app</span><span class="o">.</span><span class="n">debug</span> <span class="ow">and</span> <span class="n">_should_log_for</span><span class="p">(</span><span class="n">app</span><span class="p">,</span> <span class="s1">&#39;debug&#39;</span><span class="p">):</span>
    113. 

  113.                 <span class="n">StreamHandler</span><span class="o">.</span><span class="n">emit</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">record</span><span class="p">)</span>
    114. 

  114. 

  115.     <span class="k">class</span> <span class="nc">ProductionHandler</span><span class="p">(</span><span class="n">StreamHandler</span><span class="p">):</span>
    116. 

  116.         <span class="k">def</span> <span class="nf">emit</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">record</span><span class="p">):</span>
    117. 

  117.             <span class="k">if</span> <span class="ow">not</span> <span class="n">app</span><span class="o">.</span><span class="n">debug</span> <span class="ow">and</span> <span class="n">_should_log_for</span><span class="p">(</span><span class="n">app</span><span class="p">,</span> <span class="s1">&#39;production&#39;</span><span class="p">):</span>
    118. 

  118.                 <span class="n">StreamHandler</span><span class="o">.</span><span class="n">emit</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">record</span><span class="p">)</span>
    119. 

  119. 

  120.     <span class="n">debug_handler</span> <span class="o">=</span> <span class="n">DebugHandler</span><span class="p">()</span>
    121. 

  121.     <span class="n">debug_handler</span><span class="o">.</span><span class="n">setLevel</span><span class="p">(</span><span class="n">DEBUG</span><span class="p">)</span>
    122. 

  122.     <span class="n">debug_handler</span><span class="o">.</span><span class="n">setFormatter</span><span class="p">(</span><span class="n">Formatter</span><span class="p">(</span><span class="n">DEBUG_LOG_FORMAT</span><span class="p">))</span>
    123. 

  123. 

  124.     <span class="n">prod_handler</span> <span class="o">=</span> <span class="n">ProductionHandler</span><span class="p">(</span><span class="n">_proxy_stream</span><span class="p">)</span>
    125. 

  125.     <span class="n">prod_handler</span><span class="o">.</span><span class="n">setLevel</span><span class="p">(</span><span class="n">ERROR</span><span class="p">)</span>
    126. 

  126.     <span class="n">prod_handler</span><span class="o">.</span><span class="n">setFormatter</span><span class="p">(</span><span class="n">Formatter</span><span class="p">(</span><span class="n">PROD_LOG_FORMAT</span><span class="p">))</span>
    127. 

  127. 

  128.     <span class="n">logger</span> <span class="o">=</span> <span class="n">getLogger</span><span class="p">(</span><span class="n">app</span><span class="o">.</span><span class="n">logger_name</span><span class="p">)</span>
    129. 

  129.     <span class="c1"># just in case that was not a new logger, get rid of all the handlers</span>
    130. 

  130.     <span class="c1"># already attached to it.</span>
    131. 

  131.     <span class="k">del</span> <span class="n">logger</span><span class="o">.</span><span class="n">handlers</span><span class="p">[:]</span>
    132. 

  132.     <span class="n">logger</span><span class="o">.</span><span class="n">__class__</span> <span class="o">=</span> <span class="n">DebugLogger</span>
    133. 

  133.     <span class="n">logger</span><span class="o">.</span><span class="n">addHandler</span><span class="p">(</span><span class="n">debug_handler</span><span class="p">)</span>
    134. 

  134.     <span class="n">logger</span><span class="o">.</span><span class="n">addHandler</span><span class="p">(</span><span class="n">prod_handler</span><span class="p">)</span>
    135. 

  135.     <span class="k">return</span> <span class="n">logger</span></div>
    136. 

  136. </pre></div>
    137. 

  137. 

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    141. 

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    142. 

  142.         <div class="sphinxsidebarwrapper"><div class="relations">
    143. 

  143. <h3>Related Topics</h3>
    144. 

  144. <ul>
    145. 

  145.   <li><a href="../../index.html">Documentation overview</a><ul>
    146. 

  146.   <li><a href="../index.html">Module code</a><ul>
    147. 

  147.   </ul></li>
    148. 

  148.   </ul></li>
    149. 

  149. </ul>
    150. 

  150. </div>
    151. 

  151. <div id="searchbox" style="display: none" role="search">
    152. 

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    153. 

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  156.       <input type="hidden" name="check_keywords" value="yes" />
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  157.       <input type="hidden" name="area" value="default" />
    158. 

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    159. 

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    160. 

  160. <script type="text/javascript">$('#searchbox').show(0);</script>
    161. 

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    166. 

  166.       &copy;2016, Author.
    167. 

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