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<span>Stem Docs</span></a></h1>
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<h2 class="heading"><span>Comparing Directory Authority Flags</span></h2>
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<div class="section" id="comparing-directory-authority-flags">
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<h1>Comparing Directory Authority Flags<a class="headerlink" href="#comparing-directory-authority-flags" title="Permalink to this headline">¶</a></h1>
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<a class="reference external image-reference" href="../double_double_toil_and_trouble.html"><img alt="../../_images/back.png" src="../../_images/back.png" /></a>
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<p>Compares the votes of two directory authorities, in this case moria1 and
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maatuska, with a special interest in the 'Running' flag.</p>
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<div class="highlight-python"><div class="highlight"><pre><span class="kn">import</span> <span class="nn">collections</span>
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<span class="kn">import</span> <span class="nn">stem.descriptor</span>
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<span class="kn">import</span> <span class="nn">stem.descriptor.remote</span>
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<span class="kn">import</span> <span class="nn">stem.directory</span>
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<span class="c"># Query all authority votes asynchronously.</span>
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<span class="n">downloader</span> <span class="o">=</span> <span class="n">stem</span><span class="o">.</span><span class="n">descriptor</span><span class="o">.</span><span class="n">remote</span><span class="o">.</span><span class="n">DescriptorDownloader</span><span class="p">(</span>
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<span class="n">document_handler</span> <span class="o">=</span> <span class="n">stem</span><span class="o">.</span><span class="n">descriptor</span><span class="o">.</span><span class="n">DocumentHandler</span><span class="o">.</span><span class="n">DOCUMENT</span><span class="p">,</span>
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<span class="p">)</span>
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<span class="c"># An ordered dictionary ensures queries are finished in the order they were</span>
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<span class="c"># added.</span>
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<span class="n">queries</span> <span class="o">=</span> <span class="n">collections</span><span class="o">.</span><span class="n">OrderedDict</span><span class="p">()</span>
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<span class="k">for</span> <span class="n">name</span><span class="p">,</span> <span class="n">authority</span> <span class="ow">in</span> <span class="n">stem</span><span class="o">.</span><span class="n">directory</span><span class="o">.</span><span class="n">Authority</span><span class="o">.</span><span class="n">from_cache</span><span class="p">()</span><span class="o">.</span><span class="n">items</span><span class="p">():</span>
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<span class="k">if</span> <span class="n">authority</span><span class="o">.</span><span class="n">v3ident</span> <span class="ow">is</span> <span class="bp">None</span><span class="p">:</span>
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<span class="k">continue</span> <span class="c"># authority doesn't vote if it lacks a v3ident</span>
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<span class="n">queries</span><span class="p">[</span><span class="n">name</span><span class="p">]</span> <span class="o">=</span> <span class="n">downloader</span><span class="o">.</span><span class="n">get_vote</span><span class="p">(</span><span class="n">authority</span><span class="p">)</span>
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<span class="c"># Wait for the votes to finish being downloaded, this produces a dictionary of</span>
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<span class="c"># authority nicknames to their vote.</span>
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<span class="n">votes</span> <span class="o">=</span> <span class="nb">dict</span><span class="p">((</span><span class="n">name</span><span class="p">,</span> <span class="n">query</span><span class="o">.</span><span class="n">run</span><span class="p">()[</span><span class="mi">0</span><span class="p">])</span> <span class="k">for</span> <span class="p">(</span><span class="n">name</span><span class="p">,</span> <span class="n">query</span><span class="p">)</span> <span class="ow">in</span> <span class="n">queries</span><span class="o">.</span><span class="n">items</span><span class="p">())</span>
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<span class="c"># Get a superset of all the fingerprints in all the votes.</span>
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<span class="n">all_fingerprints</span> <span class="o">=</span> <span class="nb">set</span><span class="p">()</span>
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<span class="k">for</span> <span class="n">vote</span> <span class="ow">in</span> <span class="n">votes</span><span class="o">.</span><span class="n">values</span><span class="p">():</span>
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<span class="n">all_fingerprints</span><span class="o">.</span><span class="n">update</span><span class="p">(</span><span class="n">vote</span><span class="o">.</span><span class="n">routers</span><span class="o">.</span><span class="n">keys</span><span class="p">())</span>
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<span class="c"># Finally, compare moria1's votes to maatuska's votes.</span>
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<span class="k">for</span> <span class="n">fingerprint</span> <span class="ow">in</span> <span class="n">all_fingerprints</span><span class="p">:</span>
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<span class="n">moria1_vote</span> <span class="o">=</span> <span class="n">votes</span><span class="p">[</span><span class="s">'moria1'</span><span class="p">]</span><span class="o">.</span><span class="n">routers</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">fingerprint</span><span class="p">)</span>
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<span class="n">maatuska_vote</span> <span class="o">=</span> <span class="n">votes</span><span class="p">[</span><span class="s">'maatuska'</span><span class="p">]</span><span class="o">.</span><span class="n">routers</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">fingerprint</span><span class="p">)</span>
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<span class="k">if</span> <span class="ow">not</span> <span class="n">moria1_vote</span> <span class="ow">and</span> <span class="ow">not</span> <span class="n">maatuska_vote</span><span class="p">:</span>
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<span class="k">print</span><span class="p">(</span><span class="s">"both moria1 and maatuska haven't voted about </span><span class="si">%s</span><span class="s">"</span> <span class="o">%</span> <span class="n">fingerprint</span><span class="p">)</span>
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<span class="k">elif</span> <span class="ow">not</span> <span class="n">moria1_vote</span><span class="p">:</span>
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<span class="k">print</span><span class="p">(</span><span class="s">"moria1 hasn't voted about </span><span class="si">%s</span><span class="s">"</span> <span class="o">%</span> <span class="n">fingerprint</span><span class="p">)</span>
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<span class="k">elif</span> <span class="ow">not</span> <span class="n">maatuska_vote</span><span class="p">:</span>
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<span class="k">print</span><span class="p">(</span><span class="s">"maatuska hasn't voted about </span><span class="si">%s</span><span class="s">"</span> <span class="o">%</span> <span class="n">fingerprint</span><span class="p">)</span>
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<span class="k">elif</span> <span class="s">'Running'</span> <span class="ow">in</span> <span class="n">moria1_vote</span><span class="o">.</span><span class="n">flags</span> <span class="ow">and</span> <span class="s">'Running'</span> <span class="ow">not</span> <span class="ow">in</span> <span class="n">maatuska_vote</span><span class="o">.</span><span class="n">flags</span><span class="p">:</span>
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<span class="k">print</span><span class="p">(</span><span class="s">"moria1 has the Running flag but maatuska doesn't: </span><span class="si">%s</span><span class="s">"</span> <span class="o">%</span> <span class="n">fingerprint</span><span class="p">)</span>
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<span class="k">elif</span> <span class="s">'Running'</span> <span class="ow">in</span> <span class="n">maatuska_vote</span><span class="o">.</span><span class="n">flags</span> <span class="ow">and</span> <span class="s">'Running'</span> <span class="ow">not</span> <span class="ow">in</span> <span class="n">moria1_vote</span><span class="o">.</span><span class="n">flags</span><span class="p">:</span>
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<span class="k">print</span><span class="p">(</span><span class="s">"maatuska has the Running flag but moria1 doesn't: </span><span class="si">%s</span><span class="s">"</span> <span class="o">%</span> <span class="n">fingerprint</span><span class="p">)</span>
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</pre></div>
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</div>
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<div class="highlight-python"><pre>% python compare_flags.py
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maatuska has the Running flag but moria1 doesn't: 92FCB6748A40E6088E22FBAB943AB2DD743EA818
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maatuska has the Running flag but moria1 doesn't: 6871F682350BA931838C0EC1E4A23044DAE06A73
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maatuska has the Running flag but moria1 doesn't: E2BB13AA2F6960CD93ABE5257A825687F3973C62
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moria1 has the Running flag but maatuska doesn't: 546C54E2A89D88E0794D04AECBF1AC8AC9DA81DE
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moria1 has the Running flag but maatuska doesn't: DCAEC3D069DC39AAE43D13C8AF31B5645E05ED61
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...</pre>
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