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<h1>Source code for Bcfg2.Server.Plugins.Cfg.CfgGenshiGenerator</h1><div class="highlight"><pre>
<span class="sd">""" The CfgGenshiGenerator allows you to use the `Genshi</span>
<span class="sd"><http://genshi.edgewall.org>`_ templating system to generate</span>
<span class="sd">:ref:`server-plugins-generators-cfg` files. """</span>
<span class="kn">import</span> <span class="nn">re</span>
<span class="kn">import</span> <span class="nn">sys</span>
<span class="kn">import</span> <span class="nn">traceback</span>
<span class="kn">from</span> <span class="nn">Bcfg2.Server.Plugin</span> <span class="kn">import</span> <span class="n">PluginExecutionError</span>
<span class="kn">from</span> <span class="nn">Bcfg2.Server.Plugins.Cfg</span> <span class="kn">import</span> <span class="n">CfgGenerator</span><span class="p">,</span> <span class="n">SETUP</span>
<span class="k">try</span><span class="p">:</span>
<span class="kn">import</span> <span class="nn">genshi.core</span>
<span class="kn">from</span> <span class="nn">genshi.template</span> <span class="kn">import</span> <span class="n">TemplateLoader</span><span class="p">,</span> <span class="n">NewTextTemplate</span>
<span class="kn">from</span> <span class="nn">genshi.template.eval</span> <span class="kn">import</span> <span class="n">UndefinedError</span><span class="p">,</span> <span class="n">Suite</span>
<span class="c">#: True if Genshi libraries are available</span>
<span class="n">HAS_GENSHI</span> <span class="o">=</span> <span class="bp">True</span>
<span class="k">def</span> <span class="nf">_genshi_removes_blank_lines</span><span class="p">():</span>
<span class="sd">""" Genshi 0.5 uses the Python :mod:`compiler` package to</span>
<span class="sd"> compile genshi snippets to AST. Genshi 0.6 uses some bespoke</span>
<span class="sd"> magic, because compiler has been deprecated.</span>
<span class="sd"> :func:`compiler.parse` produces an AST that removes all excess</span>
<span class="sd"> whitespace (e.g., blank lines), while</span>
<span class="sd"> :func:`genshi.template.astutil.parse` does not. In order to</span>
<span class="sd"> determine which actual line of code an error occurs on, we</span>
<span class="sd"> need to know which is in use and how it treats blank lines.</span>
<span class="sd"> I've beat my head against this for hours and the best/only way</span>
<span class="sd"> I can find is to compile some genshi code with an error and</span>
<span class="sd"> see which line it's on."""</span>
<span class="n">code</span> <span class="o">=</span> <span class="s">"""d = dict()</span>
<span class="s">d['a']"""</span>
<span class="k">try</span><span class="p">:</span>
<span class="n">Suite</span><span class="p">(</span><span class="n">code</span><span class="p">)</span><span class="o">.</span><span class="n">execute</span><span class="p">(</span><span class="nb">dict</span><span class="p">())</span>
<span class="k">except</span> <span class="ne">KeyError</span><span class="p">:</span>
<span class="n">line</span> <span class="o">=</span> <span class="n">traceback</span><span class="o">.</span><span class="n">extract_tb</span><span class="p">(</span><span class="n">sys</span><span class="o">.</span><span class="n">exc_info</span><span class="p">()[</span><span class="mi">2</span><span class="p">])[</span><span class="o">-</span><span class="mi">1</span><span class="p">][</span><span class="mi">1</span><span class="p">]</span>
<span class="k">if</span> <span class="n">line</span> <span class="o">==</span> <span class="mi">2</span><span class="p">:</span>
<span class="k">return</span> <span class="bp">True</span>
<span class="k">else</span><span class="p">:</span>
<span class="k">return</span> <span class="bp">False</span>
<span class="c">#: True if Genshi removes all blank lines from a code block before</span>
<span class="c">#: executing it; False indicates that Genshi only removes leading</span>
<span class="c">#: and trailing blank lines. See</span>
<span class="c">#: :func:`_genshi_removes_blank_lines` for an explanation of this.</span>
<span class="n">GENSHI_REMOVES_BLANK_LINES</span> <span class="o">=</span> <span class="n">_genshi_removes_blank_lines</span><span class="p">()</span>
<span class="k">except</span> <span class="ne">ImportError</span><span class="p">:</span>
<span class="n">TemplateLoader</span> <span class="o">=</span> <span class="bp">None</span> <span class="c"># pylint: disable=C0103</span>
<span class="n">HAS_GENSHI</span> <span class="o">=</span> <span class="bp">False</span>
<span class="k">def</span> <span class="nf">removecomment</span><span class="p">(</span><span class="n">stream</span><span class="p">):</span>
<span class="sd">""" A Genshi filter that removes comments from the stream. This</span>
<span class="sd"> function is a generator.</span>
<span class="sd"> :param stream: The Genshi stream to remove comments from</span>
<span class="sd"> :type stream: genshi.core.Stream</span>
<span class="sd"> :returns: tuple of ``(kind, data, pos)``, as when iterating</span>
<span class="sd"> through a Genshi stream</span>
<span class="sd"> """</span>
<span class="k">for</span> <span class="n">kind</span><span class="p">,</span> <span class="n">data</span><span class="p">,</span> <span class="n">pos</span> <span class="ow">in</span> <span class="n">stream</span><span class="p">:</span>
<span class="k">if</span> <span class="n">kind</span> <span class="ow">is</span> <span class="n">genshi</span><span class="o">.</span><span class="n">core</span><span class="o">.</span><span class="n">COMMENT</span><span class="p">:</span>
<span class="k">continue</span>
<span class="k">yield</span> <span class="n">kind</span><span class="p">,</span> <span class="n">data</span><span class="p">,</span> <span class="n">pos</span>
<div class="viewcode-block" id="CfgGenshiGenerator"><a class="viewcode-back" href="../../../../../development/cfg.html#Bcfg2.Server.Plugins.Cfg.CfgGenshiGenerator.CfgGenshiGenerator">[docs]</a><span class="k">class</span> <span class="nc">CfgGenshiGenerator</span><span class="p">(</span><span class="n">CfgGenerator</span><span class="p">):</span>
<span class="sd">""" The CfgGenshiGenerator allows you to use the `Genshi</span>
<span class="sd"> <http://genshi.edgewall.org>`_ templating system to generate</span>
<span class="sd"> :ref:`server-plugins-generators-cfg` files. """</span>
<span class="c">#: Handle .genshi files</span>
<span class="n">__extensions__</span> <span class="o">=</span> <span class="p">[</span><span class="s">'genshi'</span><span class="p">]</span>
<span class="c">#: ``__loader_cls__`` is the class that will be instantiated to</span>
<span class="c">#: load the template files. It must implement one public function,</span>
<span class="c">#: ``load()``, as :class:`genshi.template.TemplateLoader`.</span>
<span class="n">__loader_cls__</span> <span class="o">=</span> <span class="n">TemplateLoader</span>
<span class="c">#: Ignore ``.genshi_include`` files so they can be used with the</span>
<span class="c">#: Genshi ``{% include ... %}`` directive without raising warnings.</span>
<span class="n">__ignore__</span> <span class="o">=</span> <span class="p">[</span><span class="s">"genshi_include"</span><span class="p">]</span>
<span class="c">#: Low priority to avoid matching host- or group-specific</span>
<span class="c">#: .crypt.genshi files</span>
<span class="n">__priority__</span> <span class="o">=</span> <span class="mi">50</span>
<span class="c">#: Error-handling in Genshi is pretty obtuse. This regex is used</span>
<span class="c">#: to extract the first line of the code block that raised an</span>
<span class="c">#: exception in a Genshi template so we can provide a decent error</span>
<span class="c">#: message that actually tells the end user where an error</span>
<span class="c">#: occurred.</span>
<span class="n">pyerror_re</span> <span class="o">=</span> <span class="n">re</span><span class="o">.</span><span class="n">compile</span><span class="p">(</span><span class="s">'<\w+ u?[</span><span class="se">\'</span><span class="s">"](.*?)\s*\.\.\.[</span><span class="se">\'</span><span class="s">"]>'</span><span class="p">)</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">fname</span><span class="p">,</span> <span class="n">spec</span><span class="p">,</span> <span class="n">encoding</span><span class="p">):</span>
<span class="n">CfgGenerator</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="n">fname</span><span class="p">,</span> <span class="n">spec</span><span class="p">,</span> <span class="n">encoding</span><span class="p">)</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">HAS_GENSHI</span><span class="p">:</span>
<span class="k">raise</span> <span class="n">PluginExecutionError</span><span class="p">(</span><span class="s">"Genshi is not available"</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">template</span> <span class="o">=</span> <span class="bp">None</span>
<span class="bp">self</span><span class="o">.</span><span class="n">loader</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">__loader_cls__</span><span class="p">(</span><span class="n">max_cache_size</span><span class="o">=</span><span class="mi">0</span><span class="p">)</span>
<span class="n">__init__</span><span class="o">.</span><span class="n">__doc__</span> <span class="o">=</span> <span class="n">CfgGenerator</span><span class="o">.</span><span class="n">__init__</span><span class="o">.</span><span class="n">__doc__</span>
<div class="viewcode-block" id="CfgGenshiGenerator.get_data"><a class="viewcode-back" href="../../../../../development/cfg.html#Bcfg2.Server.Plugins.Cfg.CfgGenshiGenerator.CfgGenshiGenerator.get_data">[docs]</a> <span class="k">def</span> <span class="nf">get_data</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">entry</span><span class="p">,</span> <span class="n">metadata</span><span class="p">):</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">template</span> <span class="ow">is</span> <span class="bp">None</span><span class="p">:</span>
<span class="k">raise</span> <span class="n">PluginExecutionError</span><span class="p">(</span><span class="s">"Failed to load template </span><span class="si">%s</span><span class="s">"</span> <span class="o">%</span>
<span class="bp">self</span><span class="o">.</span><span class="n">name</span><span class="p">)</span>
<span class="n">fname</span> <span class="o">=</span> <span class="n">entry</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s">'realname'</span><span class="p">,</span> <span class="n">entry</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s">'name'</span><span class="p">))</span>
<span class="n">stream</span> <span class="o">=</span> \
<span class="bp">self</span><span class="o">.</span><span class="n">template</span><span class="o">.</span><span class="n">generate</span><span class="p">(</span><span class="n">name</span><span class="o">=</span><span class="n">fname</span><span class="p">,</span>
<span class="n">metadata</span><span class="o">=</span><span class="n">metadata</span><span class="p">,</span>
<span class="n">path</span><span class="o">=</span><span class="bp">self</span><span class="o">.</span><span class="n">name</span><span class="p">,</span>
<span class="n">source_path</span><span class="o">=</span><span class="bp">self</span><span class="o">.</span><span class="n">name</span><span class="p">,</span>
<span class="n">repo</span><span class="o">=</span><span class="n">SETUP</span><span class="p">[</span><span class="s">'repo'</span><span class="p">])</span><span class="o">.</span><span class="n">filter</span><span class="p">(</span><span class="n">removecomment</span><span class="p">)</span>
<span class="k">try</span><span class="p">:</span>
<span class="k">try</span><span class="p">:</span>
<span class="k">return</span> <span class="n">stream</span><span class="o">.</span><span class="n">render</span><span class="p">(</span><span class="s">'text'</span><span class="p">,</span> <span class="n">encoding</span><span class="o">=</span><span class="bp">self</span><span class="o">.</span><span class="n">encoding</span><span class="p">,</span>
<span class="n">strip_whitespace</span><span class="o">=</span><span class="bp">False</span><span class="p">)</span>
<span class="k">except</span> <span class="ne">TypeError</span><span class="p">:</span>
<span class="k">return</span> <span class="n">stream</span><span class="o">.</span><span class="n">render</span><span class="p">(</span><span class="s">'text'</span><span class="p">,</span> <span class="n">encoding</span><span class="o">=</span><span class="bp">self</span><span class="o">.</span><span class="n">encoding</span><span class="p">)</span>
<span class="k">except</span> <span class="n">UndefinedError</span><span class="p">:</span>
<span class="c"># a failure in a genshi expression _other_ than %{ python ... %}</span>
<span class="n">err</span> <span class="o">=</span> <span class="n">sys</span><span class="o">.</span><span class="n">exc_info</span><span class="p">()[</span><span class="mi">1</span><span class="p">]</span>
<span class="n">stack</span> <span class="o">=</span> <span class="n">traceback</span><span class="o">.</span><span class="n">extract_tb</span><span class="p">(</span><span class="n">sys</span><span class="o">.</span><span class="n">exc_info</span><span class="p">()[</span><span class="mi">2</span><span class="p">])</span>
<span class="k">for</span> <span class="n">quad</span> <span class="ow">in</span> <span class="n">stack</span><span class="p">:</span>
<span class="k">if</span> <span class="n">quad</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span> <span class="o">==</span> <span class="bp">self</span><span class="o">.</span><span class="n">name</span><span class="p">:</span>
<span class="k">raise</span> <span class="n">PluginExecutionError</span><span class="p">(</span><span class="s">"</span><span class="si">%s</span><span class="s">: </span><span class="si">%s</span><span class="s"> at '</span><span class="si">%s</span><span class="s">'"</span> <span class="o">%</span>
<span class="p">(</span><span class="n">err</span><span class="o">.</span><span class="n">__class__</span><span class="o">.</span><span class="n">__name__</span><span class="p">,</span> <span class="n">err</span><span class="p">,</span>
<span class="n">quad</span><span class="p">[</span><span class="mi">2</span><span class="p">]))</span>
<span class="k">raise</span>
<span class="k">except</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_handle_genshi_exception</span><span class="p">(</span><span class="n">sys</span><span class="o">.</span><span class="n">exc_info</span><span class="p">())</span></div>
<span class="n">get_data</span><span class="o">.</span><span class="n">__doc__</span> <span class="o">=</span> <span class="n">CfgGenerator</span><span class="o">.</span><span class="n">get_data</span><span class="o">.</span><span class="n">__doc__</span>
<span class="k">def</span> <span class="nf">_handle_genshi_exception</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">exc</span><span class="p">):</span>
<span class="sd">""" this is horrible, and I deeply apologize to whoever gets</span>
<span class="sd"> to maintain this after I go to the Great Beer Garden in the</span>
<span class="sd"> Sky. genshi is incredibly opaque about what's being executed,</span>
<span class="sd"> so the only way I can find to determine which {% python %}</span>
<span class="sd"> block is being executed -- if there are multiples -- is to</span>
<span class="sd"> iterate through them and match the snippet of the first line</span>
<span class="sd"> that's in the traceback with the first non-empty line of the</span>
<span class="sd"> block. """</span>
<span class="c"># a failure in a %{ python ... %} block -- the snippet in</span>
<span class="c"># the traceback is just the beginning of the block.</span>
<span class="n">err</span> <span class="o">=</span> <span class="n">exc</span><span class="p">[</span><span class="mi">1</span><span class="p">]</span>
<span class="n">stack</span> <span class="o">=</span> <span class="n">traceback</span><span class="o">.</span><span class="n">extract_tb</span><span class="p">(</span><span class="n">exc</span><span class="p">[</span><span class="mi">2</span><span class="p">])</span>
<span class="c"># find the right frame of the stack</span>
<span class="k">for</span> <span class="n">frame</span> <span class="ow">in</span> <span class="nb">reversed</span><span class="p">(</span><span class="n">stack</span><span class="p">):</span>
<span class="k">if</span> <span class="n">frame</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span> <span class="o">==</span> <span class="bp">self</span><span class="o">.</span><span class="n">name</span><span class="p">:</span>
<span class="n">lineno</span><span class="p">,</span> <span class="n">func</span> <span class="o">=</span> <span class="n">frame</span><span class="p">[</span><span class="mi">1</span><span class="p">:</span><span class="mi">3</span><span class="p">]</span>
<span class="k">break</span>
<span class="k">else</span><span class="p">:</span>
<span class="c"># couldn't even find the stack frame, wtf.</span>
<span class="k">raise</span> <span class="n">PluginExecutionError</span><span class="p">(</span><span class="s">"</span><span class="si">%s</span><span class="s">: </span><span class="si">%s</span><span class="s">"</span> <span class="o">%</span>
<span class="p">(</span><span class="n">err</span><span class="o">.</span><span class="n">__class__</span><span class="o">.</span><span class="n">__name__</span><span class="p">,</span> <span class="n">err</span><span class="p">))</span>
<span class="n">execs</span> <span class="o">=</span> <span class="p">[</span><span class="n">contents</span>
<span class="k">for</span> <span class="n">etype</span><span class="p">,</span> <span class="n">contents</span><span class="p">,</span> <span class="n">_</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">template</span><span class="o">.</span><span class="n">stream</span>
<span class="k">if</span> <span class="n">etype</span> <span class="o">==</span> <span class="bp">self</span><span class="o">.</span><span class="n">template</span><span class="o">.</span><span class="n">EXEC</span><span class="p">]</span>
<span class="n">contents</span> <span class="o">=</span> <span class="bp">None</span>
<span class="k">if</span> <span class="nb">len</span><span class="p">(</span><span class="n">execs</span><span class="p">)</span> <span class="o">==</span> <span class="mi">1</span><span class="p">:</span>
<span class="n">contents</span> <span class="o">=</span> <span class="n">execs</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span>
<span class="k">elif</span> <span class="nb">len</span><span class="p">(</span><span class="n">execs</span><span class="p">)</span> <span class="o">></span> <span class="mi">1</span><span class="p">:</span>
<span class="n">match</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">pyerror_re</span><span class="o">.</span><span class="n">match</span><span class="p">(</span><span class="n">func</span><span class="p">)</span>
<span class="k">if</span> <span class="n">match</span><span class="p">:</span>
<span class="n">firstline</span> <span class="o">=</span> <span class="n">match</span><span class="o">.</span><span class="n">group</span><span class="p">(</span><span class="mi">0</span><span class="p">)</span>
<span class="k">for</span> <span class="n">pyblock</span> <span class="ow">in</span> <span class="n">execs</span><span class="p">:</span>
<span class="k">if</span> <span class="n">pyblock</span><span class="o">.</span><span class="n">startswith</span><span class="p">(</span><span class="n">firstline</span><span class="p">):</span>
<span class="n">contents</span> <span class="o">=</span> <span class="n">pyblock</span>
<span class="k">break</span>
<span class="c"># else, no EXEC blocks -- WTF?</span>
<span class="k">if</span> <span class="n">contents</span><span class="p">:</span>
<span class="c"># we now have the bogus block, but we need to get the</span>
<span class="c"># offending line. To get there, we do (line number given</span>
<span class="c"># in the exception) - (firstlineno from the internal</span>
<span class="c"># genshi code object of the snippet) = (line number of the</span>
<span class="c"># line with an error within the block, with blank lines</span>
<span class="c"># removed as appropriate for</span>
<span class="c"># :attr:`GENSHI_REMOVES_BLANK_LINES`)</span>
<span class="n">code</span> <span class="o">=</span> <span class="n">contents</span><span class="o">.</span><span class="n">source</span><span class="o">.</span><span class="n">strip</span><span class="p">()</span><span class="o">.</span><span class="n">splitlines</span><span class="p">()</span>
<span class="k">if</span> <span class="n">GENSHI_REMOVES_BLANK_LINES</span><span class="p">:</span>
<span class="n">code</span> <span class="o">=</span> <span class="p">[</span><span class="n">l</span> <span class="k">for</span> <span class="n">l</span> <span class="ow">in</span> <span class="n">code</span> <span class="k">if</span> <span class="n">l</span><span class="o">.</span><span class="n">strip</span><span class="p">()]</span>
<span class="k">try</span><span class="p">:</span>
<span class="n">line</span> <span class="o">=</span> <span class="n">code</span><span class="p">[</span><span class="n">lineno</span> <span class="o">-</span> <span class="n">contents</span><span class="o">.</span><span class="n">code</span><span class="o">.</span><span class="n">co_firstlineno</span><span class="p">]</span>
<span class="k">raise</span> <span class="n">PluginExecutionError</span><span class="p">(</span><span class="s">"</span><span class="si">%s</span><span class="s">: </span><span class="si">%s</span><span class="s"> at '</span><span class="si">%s</span><span class="s">'"</span> <span class="o">%</span>
<span class="p">(</span><span class="n">err</span><span class="o">.</span><span class="n">__class__</span><span class="o">.</span><span class="n">__name__</span><span class="p">,</span> <span class="n">err</span><span class="p">,</span>
<span class="n">line</span><span class="p">))</span>
<span class="k">except</span> <span class="ne">IndexError</span><span class="p">:</span>
<span class="k">raise</span> <span class="n">PluginExecutionError</span><span class="p">(</span><span class="s">"</span><span class="si">%s</span><span class="s">: </span><span class="si">%s</span><span class="s">"</span> <span class="o">%</span>
<span class="p">(</span><span class="n">err</span><span class="o">.</span><span class="n">__class__</span><span class="o">.</span><span class="n">__name__</span><span class="p">,</span> <span class="n">err</span><span class="p">))</span>
<span class="k">raise</span>
<div class="viewcode-block" id="CfgGenshiGenerator.handle_event"><a class="viewcode-back" href="../../../../../development/cfg.html#Bcfg2.Server.Plugins.Cfg.CfgGenshiGenerator.CfgGenshiGenerator.handle_event">[docs]</a> <span class="k">def</span> <span class="nf">handle_event</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">event</span><span class="p">):</span>
<span class="n">CfgGenerator</span><span class="o">.</span><span class="n">handle_event</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">event</span><span class="p">)</span>
<span class="k">try</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">template</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">loader</span><span class="o">.</span><span class="n">load</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">name</span><span class="p">,</span> <span class="n">cls</span><span class="o">=</span><span class="n">NewTextTemplate</span><span class="p">,</span>
<span class="n">encoding</span><span class="o">=</span><span class="bp">self</span><span class="o">.</span><span class="n">encoding</span><span class="p">)</span>
<span class="k">except</span><span class="p">:</span>
<span class="k">raise</span> <span class="n">PluginExecutionError</span><span class="p">(</span><span class="s">"Failed to load template: </span><span class="si">%s</span><span class="s">"</span> <span class="o">%</span>
<span class="n">sys</span><span class="o">.</span><span class="n">exc_info</span><span class="p">()[</span><span class="mi">1</span><span class="p">])</span></div>
<span class="n">handle_event</span><span class="o">.</span><span class="n">__doc__</span> <span class="o">=</span> <span class="n">CfgGenerator</span><span class="o">.</span><span class="n">handle_event</span><span class="o">.</span><span class="n">__doc__</span></div>
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