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<h1>Source code for vmware.vapi.lib.load</h1><div class="highlight"><pre>
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<span class="sd">"""</span>
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<span class="sd">Convenience methods for dynamic loading</span>
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<span class="sd">"""</span>
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<span class="n">__author__</span> <span class="o">=</span> <span class="s">'VMware, Inc.'</span>
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<span class="n">__copyright__</span> <span class="o">=</span> <span class="s">'Copyright 2011-2014 VMware, Inc. All rights reserved. -- VMware Confidential'</span>
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<span class="kn">import</span> <span class="nn">logging</span>
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<span class="kn">import</span> <span class="nn">six</span>
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<span class="kn">from</span> <span class="nn">vmware.vapi.settings</span> <span class="kn">import</span> <span class="n">config</span>
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<span class="n">logger</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="n">__name__</span><span class="p">)</span>
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<div class="viewcode-block" id="dynamic_import"><a class="viewcode-back" href="../../../../vmware.vapi.lib.html#vmware.vapi.lib.load.dynamic_import">[docs]</a><span class="k">def</span> <span class="nf">dynamic_import</span><span class="p">(</span><span class="n">constructor</span><span class="p">):</span>
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<span class="sd">"""</span>
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<span class="sd"> Dynamically import a module and get the specified module attribute</span>
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<span class="sd"> :type constructor: :class:`str`</span>
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<span class="sd"> :param constructor: Fully qualified module attribute</span>
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<span class="sd"> :rtype: :class:`object`</span>
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<span class="sd"> :return: Python object</span>
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<span class="sd"> """</span>
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<span class="n">target_attr</span> <span class="o">=</span> <span class="bp">None</span>
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<span class="k">if</span> <span class="n">constructor</span><span class="p">:</span>
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<span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">constructor</span><span class="p">,</span> <span class="n">six</span><span class="o">.</span><span class="n">string_types</span><span class="p">):</span>
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<span class="k">try</span><span class="p">:</span>
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<span class="n">module_name</span><span class="p">,</span> <span class="n">fn</span> <span class="o">=</span> <span class="n">constructor</span><span class="o">.</span><span class="n">rsplit</span><span class="p">(</span><span class="s">'.'</span><span class="p">,</span> <span class="mi">1</span><span class="p">)</span>
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<span class="n">module</span> <span class="o">=</span> <span class="nb">__import__</span><span class="p">(</span><span class="n">module_name</span><span class="p">,</span> <span class="nb">globals</span><span class="p">(),</span> <span class="nb">locals</span><span class="p">(),</span> <span class="p">[</span><span class="n">fn</span><span class="p">])</span>
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<span class="n">target_attr</span> <span class="o">=</span> <span class="nb">getattr</span><span class="p">(</span><span class="n">module</span><span class="p">,</span> <span class="n">fn</span><span class="p">)</span>
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<span class="k">except</span> <span class="ne">ImportError</span> <span class="k">as</span> <span class="n">err</span><span class="p">:</span>
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<span class="n">logger</span><span class="o">.</span><span class="n">exception</span><span class="p">(</span><span class="s">'Import failed: </span><span class="si">%s</span><span class="s">: module </span><span class="si">%s</span><span class="s"> fn </span><span class="si">%s</span><span class="s">'</span><span class="p">,</span>
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<span class="nb">str</span><span class="p">(</span><span class="n">err</span><span class="p">),</span> <span class="n">module_name</span><span class="p">,</span> <span class="n">fn</span><span class="p">)</span>
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<span class="n">target_attr</span> <span class="o">=</span> <span class="bp">None</span>
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<span class="k">except</span> <span class="ne">AttributeError</span> <span class="k">as</span> <span class="n">err</span><span class="p">:</span>
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<span class="n">logger</span><span class="o">.</span><span class="n">exception</span><span class="p">(</span><span class="s">'Import failed: Module </span><span class="si">%s</span><span class="s"> has no </span><span class="si">%s</span><span class="s">'</span><span class="p">,</span>
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<span class="n">module_name</span><span class="p">,</span> <span class="n">fn</span><span class="p">)</span>
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<span class="n">target_attr</span> <span class="o">=</span> <span class="bp">None</span>
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<span class="k">return</span> <span class="n">target_attr</span>
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</div>
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<div class="viewcode-block" id="import_multiple_classes"><a class="viewcode-back" href="../../../../vmware.vapi.lib.html#vmware.vapi.lib.load.import_multiple_classes">[docs]</a><span class="k">def</span> <span class="nf">import_multiple_classes</span><span class="p">(</span><span class="n">section</span><span class="p">,</span> <span class="n">property_key</span><span class="p">):</span>
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<span class="sd">"""</span>
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<span class="sd"> Import multiple class names provided in the config file</span>
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<span class="sd"> :type section: :class:`str`</span>
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<span class="sd"> :param section: Name of the section in the config file</span>
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<span class="sd"> :type property_key: :class:`str`</span>
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<span class="sd"> :param property_key: Name of the property in the config file</span>
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<span class="sd"> :rtype: :class:`list` of :class:`str`</span>
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<span class="sd"> :return: List of class references</span>
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<span class="sd"> """</span>
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<span class="n">cfg</span> <span class="o">=</span> <span class="n">config</span><span class="o">.</span><span class="n">cfg</span>
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<span class="n">classes</span> <span class="o">=</span> <span class="p">[]</span>
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<span class="k">if</span> <span class="n">cfg</span> <span class="ow">and</span> <span class="n">cfg</span><span class="o">.</span><span class="n">has_section</span><span class="p">(</span><span class="n">section</span><span class="p">)</span> <span class="ow">and</span> <span class="n">cfg</span><span class="o">.</span><span class="n">has_option</span><span class="p">(</span><span class="n">section</span><span class="p">,</span>
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<span class="n">property_key</span><span class="p">):</span>
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<span class="n">class_names</span> <span class="o">=</span> <span class="n">cfg</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">section</span><span class="p">,</span> <span class="n">property_key</span><span class="p">)</span><span class="o">.</span><span class="n">split</span><span class="p">(</span><span class="s">','</span><span class="p">)</span>
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<span class="k">for</span> <span class="n">class_name</span> <span class="ow">in</span> <span class="n">class_names</span><span class="p">:</span>
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<span class="n">class_name</span> <span class="o">=</span> <span class="n">class_name</span><span class="o">.</span><span class="n">strip</span><span class="p">()</span>
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<span class="n">class_ref</span> <span class="o">=</span> <span class="n">dynamic_import</span><span class="p">(</span><span class="n">class_name</span><span class="p">)</span>
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<span class="k">if</span> <span class="n">class_ref</span> <span class="ow">is</span> <span class="ow">not</span> <span class="bp">None</span><span class="p">:</span>
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<span class="n">classes</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">class_ref</span><span class="p">())</span>
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<span class="k">return</span> <span class="n">classes</span></div>
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</pre></div>
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