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  <h1>Source code for grpc.early_adopter.implementations</h1><div class="highlight"><pre>
<span></span><span class="c1"># Copyright 2015, Google Inc.</span>
<span class="c1"># All rights reserved.</span>
<span class="c1">#</span>
<span class="c1"># Redistribution and use in source and binary forms, with or without</span>
<span class="c1"># modification, are permitted provided that the following conditions are</span>
<span class="c1"># met:</span>
<span class="c1">#</span>
<span class="c1">#     * Redistributions of source code must retain the above copyright</span>
<span class="c1"># notice, this list of conditions and the following disclaimer.</span>
<span class="c1">#     * Redistributions in binary form must reproduce the above</span>
<span class="c1"># copyright notice, this list of conditions and the following disclaimer</span>
<span class="c1"># in the documentation and/or other materials provided with the</span>
<span class="c1"># distribution.</span>
<span class="c1">#     * Neither the name of Google Inc. nor the names of its</span>
<span class="c1"># contributors may be used to endorse or promote products derived from</span>
<span class="c1"># this software without specific prior written permission.</span>
<span class="c1">#</span>
<span class="c1"># THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS</span>
<span class="c1"># &quot;AS IS&quot; AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT</span>
<span class="c1"># LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR</span>
<span class="c1"># A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT</span>
<span class="c1"># OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,</span>
<span class="c1"># SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT</span>
<span class="c1"># LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,</span>
<span class="c1"># DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY</span>
<span class="c1"># THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT</span>
<span class="c1"># (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE</span>
<span class="c1"># OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.</span>

<span class="sd">&quot;&quot;&quot;Entry points into GRPC.&quot;&quot;&quot;</span>

<span class="kn">import</span> <span class="nn">threading</span>

<span class="kn">from</span> <span class="nn">grpc._adapter</span> <span class="k">import</span> <span class="n">fore</span> <span class="k">as</span> <span class="n">_fore</span>
<span class="kn">from</span> <span class="nn">grpc._adapter</span> <span class="k">import</span> <span class="n">rear</span> <span class="k">as</span> <span class="n">_rear</span>
<span class="kn">from</span> <span class="nn">grpc.framework.alpha</span> <span class="k">import</span> <span class="n">_face_utilities</span>
<span class="kn">from</span> <span class="nn">grpc.framework.alpha</span> <span class="k">import</span> <span class="n">_reexport</span>
<span class="kn">from</span> <span class="nn">grpc.framework.alpha</span> <span class="k">import</span> <span class="n">interfaces</span>
<span class="kn">from</span> <span class="nn">grpc.framework.base</span> <span class="k">import</span> <span class="n">implementations</span> <span class="k">as</span> <span class="n">_base_implementations</span>
<span class="kn">from</span> <span class="nn">grpc.framework.base</span> <span class="k">import</span> <span class="n">util</span> <span class="k">as</span> <span class="n">_base_utilities</span>
<span class="kn">from</span> <span class="nn">grpc.framework.face</span> <span class="k">import</span> <span class="n">implementations</span> <span class="k">as</span> <span class="n">_face_implementations</span>
<span class="kn">from</span> <span class="nn">grpc.framework.foundation</span> <span class="k">import</span> <span class="n">logging_pool</span>

<span class="n">_DEFAULT_THREAD_POOL_SIZE</span> <span class="o">=</span> <span class="mi">8</span>
<span class="n">_ONE_DAY_IN_SECONDS</span> <span class="o">=</span> <span class="mi">24</span> <span class="o">*</span> <span class="mi">60</span> <span class="o">*</span> <span class="mi">60</span>


<span class="k">class</span> <span class="nc">_Server</span><span class="p">(</span><span class="n">interfaces</span><span class="o">.</span><span class="n">Server</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">breakdown</span><span class="p">,</span> <span class="n">port</span><span class="p">,</span> <span class="n">private_key</span><span class="p">,</span> <span class="n">certificate_chain</span><span class="p">,</span>
        <span class="n">thread_pool_size</span><span class="o">=</span><span class="n">_DEFAULT_THREAD_POOL_SIZE</span><span class="p">):</span>
    <span class="bp">self</span><span class="o">.</span><span class="n">_lock</span> <span class="o">=</span> <span class="n">threading</span><span class="o">.</span><span class="n">Lock</span><span class="p">()</span>
    <span class="bp">self</span><span class="o">.</span><span class="n">_breakdown</span> <span class="o">=</span> <span class="n">breakdown</span>
    <span class="bp">self</span><span class="o">.</span><span class="n">_port</span> <span class="o">=</span> <span class="n">port</span>
    <span class="k">if</span> <span class="n">private_key</span> <span class="ow">is</span> <span class="kc">None</span> <span class="ow">or</span> <span class="n">certificate_chain</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
      <span class="bp">self</span><span class="o">.</span><span class="n">_key_chain_pairs</span> <span class="o">=</span> <span class="p">()</span>
    <span class="k">else</span><span class="p">:</span>
      <span class="bp">self</span><span class="o">.</span><span class="n">_key_chain_pairs</span> <span class="o">=</span> <span class="p">((</span><span class="n">private_key</span><span class="p">,</span> <span class="n">certificate_chain</span><span class="p">),)</span>

    <span class="bp">self</span><span class="o">.</span><span class="n">_pool_size</span> <span class="o">=</span> <span class="n">thread_pool_size</span>
    <span class="bp">self</span><span class="o">.</span><span class="n">_pool</span> <span class="o">=</span> <span class="kc">None</span>
    <span class="bp">self</span><span class="o">.</span><span class="n">_back</span> <span class="o">=</span> <span class="kc">None</span>
    <span class="bp">self</span><span class="o">.</span><span class="n">_fore_link</span> <span class="o">=</span> <span class="kc">None</span>

  <span class="k">def</span> <span class="nf">_start</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
    <span class="k">with</span> <span class="bp">self</span><span class="o">.</span><span class="n">_lock</span><span class="p">:</span>
      <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">_pool</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">_pool</span> <span class="o">=</span> <span class="n">logging_pool</span><span class="o">.</span><span class="n">pool</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_pool_size</span><span class="p">)</span>
        <span class="n">servicer</span> <span class="o">=</span> <span class="n">_face_implementations</span><span class="o">.</span><span class="n">servicer</span><span class="p">(</span>
            <span class="bp">self</span><span class="o">.</span><span class="n">_pool</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">_breakdown</span><span class="o">.</span><span class="n">implementations</span><span class="p">,</span> <span class="kc">None</span><span class="p">)</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">_back</span> <span class="o">=</span> <span class="n">_base_implementations</span><span class="o">.</span><span class="n">back_link</span><span class="p">(</span>
            <span class="n">servicer</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">_pool</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">_pool</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">_pool</span><span class="p">,</span> <span class="n">_ONE_DAY_IN_SECONDS</span><span class="p">,</span>
            <span class="n">_ONE_DAY_IN_SECONDS</span><span class="p">)</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">_fore_link</span> <span class="o">=</span> <span class="n">_fore</span><span class="o">.</span><span class="n">ForeLink</span><span class="p">(</span>
            <span class="bp">self</span><span class="o">.</span><span class="n">_pool</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">_breakdown</span><span class="o">.</span><span class="n">request_deserializers</span><span class="p">,</span>
            <span class="bp">self</span><span class="o">.</span><span class="n">_breakdown</span><span class="o">.</span><span class="n">response_serializers</span><span class="p">,</span> <span class="kc">None</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">_key_chain_pairs</span><span class="p">,</span>
            <span class="n">port</span><span class="o">=</span><span class="bp">self</span><span class="o">.</span><span class="n">_port</span><span class="p">)</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">_back</span><span class="o">.</span><span class="n">join_fore_link</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_fore_link</span><span class="p">)</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">_fore_link</span><span class="o">.</span><span class="n">join_rear_link</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_back</span><span class="p">)</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">_fore_link</span><span class="o">.</span><span class="n">start</span><span class="p">()</span>
      <span class="k">else</span><span class="p">:</span>
        <span class="k">raise</span> <span class="ne">ValueError</span><span class="p">(</span><span class="s1">&#39;Server currently running!&#39;</span><span class="p">)</span>

  <span class="k">def</span> <span class="nf">_stop</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
    <span class="k">with</span> <span class="bp">self</span><span class="o">.</span><span class="n">_lock</span><span class="p">:</span>
      <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">_pool</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
        <span class="k">raise</span> <span class="ne">ValueError</span><span class="p">(</span><span class="s1">&#39;Server not running!&#39;</span><span class="p">)</span>
      <span class="k">else</span><span class="p">:</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">_fore_link</span><span class="o">.</span><span class="n">stop</span><span class="p">()</span>
        <span class="n">_base_utilities</span><span class="o">.</span><span class="n">wait_for_idle</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_back</span><span class="p">)</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">_pool</span><span class="o">.</span><span class="n">shutdown</span><span class="p">(</span><span class="n">wait</span><span class="o">=</span><span class="kc">True</span><span class="p">)</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">_fore_link</span> <span class="o">=</span> <span class="kc">None</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">_back</span> <span class="o">=</span> <span class="kc">None</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">_pool</span> <span class="o">=</span> <span class="kc">None</span>

  <span class="k">def</span> <span class="nf">__enter__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
    <span class="bp">self</span><span class="o">.</span><span class="n">_start</span><span class="p">()</span>
    <span class="k">return</span> <span class="bp">self</span>

  <span class="k">def</span> <span class="nf">__exit__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">exc_type</span><span class="p">,</span> <span class="n">exc_val</span><span class="p">,</span> <span class="n">exc_tb</span><span class="p">):</span>
    <span class="bp">self</span><span class="o">.</span><span class="n">_stop</span><span class="p">()</span>
    <span class="k">return</span> <span class="kc">False</span>

  <span class="k">def</span> <span class="nf">start</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
    <span class="bp">self</span><span class="o">.</span><span class="n">_start</span><span class="p">()</span>

  <span class="k">def</span> <span class="nf">stop</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
    <span class="bp">self</span><span class="o">.</span><span class="n">_stop</span><span class="p">()</span>

  <span class="k">def</span> <span class="nf">port</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
    <span class="k">with</span> <span class="bp">self</span><span class="o">.</span><span class="n">_lock</span><span class="p">:</span>
      <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">_fore_link</span><span class="o">.</span><span class="n">port</span><span class="p">()</span>


<span class="k">class</span> <span class="nc">_Stub</span><span class="p">(</span><span class="n">interfaces</span><span class="o">.</span><span class="n">Stub</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">breakdown</span><span class="p">,</span> <span class="n">host</span><span class="p">,</span> <span class="n">port</span><span class="p">,</span> <span class="n">secure</span><span class="p">,</span> <span class="n">root_certificates</span><span class="p">,</span> <span class="n">private_key</span><span class="p">,</span>
      <span class="n">certificate_chain</span><span class="p">,</span> <span class="n">metadata_transformer</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">server_host_override</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span>
      <span class="n">thread_pool_size</span><span class="o">=</span><span class="n">_DEFAULT_THREAD_POOL_SIZE</span><span class="p">):</span>
    <span class="bp">self</span><span class="o">.</span><span class="n">_lock</span> <span class="o">=</span> <span class="n">threading</span><span class="o">.</span><span class="n">Lock</span><span class="p">()</span>
    <span class="bp">self</span><span class="o">.</span><span class="n">_breakdown</span> <span class="o">=</span> <span class="n">breakdown</span>
    <span class="bp">self</span><span class="o">.</span><span class="n">_host</span> <span class="o">=</span> <span class="n">host</span>
    <span class="bp">self</span><span class="o">.</span><span class="n">_port</span> <span class="o">=</span> <span class="n">port</span>
    <span class="bp">self</span><span class="o">.</span><span class="n">_secure</span> <span class="o">=</span> <span class="n">secure</span>
    <span class="bp">self</span><span class="o">.</span><span class="n">_root_certificates</span> <span class="o">=</span> <span class="n">root_certificates</span>
    <span class="bp">self</span><span class="o">.</span><span class="n">_private_key</span> <span class="o">=</span> <span class="n">private_key</span>
    <span class="bp">self</span><span class="o">.</span><span class="n">_certificate_chain</span> <span class="o">=</span> <span class="n">certificate_chain</span>
    <span class="bp">self</span><span class="o">.</span><span class="n">_metadata_transformer</span> <span class="o">=</span> <span class="n">metadata_transformer</span>
    <span class="bp">self</span><span class="o">.</span><span class="n">_server_host_override</span> <span class="o">=</span> <span class="n">server_host_override</span>

    <span class="bp">self</span><span class="o">.</span><span class="n">_pool_size</span> <span class="o">=</span> <span class="n">thread_pool_size</span>
    <span class="bp">self</span><span class="o">.</span><span class="n">_pool</span> <span class="o">=</span> <span class="kc">None</span>
    <span class="bp">self</span><span class="o">.</span><span class="n">_front</span> <span class="o">=</span> <span class="kc">None</span>
    <span class="bp">self</span><span class="o">.</span><span class="n">_rear_link</span> <span class="o">=</span> <span class="kc">None</span>
    <span class="bp">self</span><span class="o">.</span><span class="n">_understub</span> <span class="o">=</span> <span class="kc">None</span>

  <span class="k">def</span> <span class="nf">__enter__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
    <span class="k">with</span> <span class="bp">self</span><span class="o">.</span><span class="n">_lock</span><span class="p">:</span>
      <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">_pool</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">_pool</span> <span class="o">=</span> <span class="n">logging_pool</span><span class="o">.</span><span class="n">pool</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_pool_size</span><span class="p">)</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">_front</span> <span class="o">=</span> <span class="n">_base_implementations</span><span class="o">.</span><span class="n">front_link</span><span class="p">(</span>
            <span class="bp">self</span><span class="o">.</span><span class="n">_pool</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">_pool</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">_pool</span><span class="p">)</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">_rear_link</span> <span class="o">=</span> <span class="n">_rear</span><span class="o">.</span><span class="n">RearLink</span><span class="p">(</span>
            <span class="bp">self</span><span class="o">.</span><span class="n">_host</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">_port</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">_pool</span><span class="p">,</span>
            <span class="bp">self</span><span class="o">.</span><span class="n">_breakdown</span><span class="o">.</span><span class="n">request_serializers</span><span class="p">,</span>
            <span class="bp">self</span><span class="o">.</span><span class="n">_breakdown</span><span class="o">.</span><span class="n">response_deserializers</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">_secure</span><span class="p">,</span>
            <span class="bp">self</span><span class="o">.</span><span class="n">_root_certificates</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">_private_key</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">_certificate_chain</span><span class="p">,</span>
            <span class="n">metadata_transformer</span><span class="o">=</span><span class="bp">self</span><span class="o">.</span><span class="n">_metadata_transformer</span><span class="p">,</span>
            <span class="n">server_host_override</span><span class="o">=</span><span class="bp">self</span><span class="o">.</span><span class="n">_server_host_override</span><span class="p">)</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">_front</span><span class="o">.</span><span class="n">join_rear_link</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_rear_link</span><span class="p">)</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">_rear_link</span><span class="o">.</span><span class="n">join_fore_link</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_front</span><span class="p">)</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">_rear_link</span><span class="o">.</span><span class="n">start</span><span class="p">()</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">_understub</span> <span class="o">=</span> <span class="n">_face_implementations</span><span class="o">.</span><span class="n">dynamic_stub</span><span class="p">(</span>
            <span class="bp">self</span><span class="o">.</span><span class="n">_breakdown</span><span class="o">.</span><span class="n">face_cardinalities</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">_front</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">_pool</span><span class="p">,</span> <span class="s1">&#39;&#39;</span><span class="p">)</span>
      <span class="k">else</span><span class="p">:</span>
        <span class="k">raise</span> <span class="ne">ValueError</span><span class="p">(</span><span class="s1">&#39;Tried to __enter__ already-__enter__ed Stub!&#39;</span><span class="p">)</span>
    <span class="k">return</span> <span class="bp">self</span>

  <span class="k">def</span> <span class="nf">__exit__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">exc_type</span><span class="p">,</span> <span class="n">exc_val</span><span class="p">,</span> <span class="n">exc_tb</span><span class="p">):</span>
    <span class="k">with</span> <span class="bp">self</span><span class="o">.</span><span class="n">_lock</span><span class="p">:</span>
      <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">_pool</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
        <span class="k">raise</span> <span class="ne">ValueError</span><span class="p">(</span><span class="s1">&#39;Tried to __exit__ non-__enter__ed Stub!&#39;</span><span class="p">)</span>
      <span class="k">else</span><span class="p">:</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">_rear_link</span><span class="o">.</span><span class="n">stop</span><span class="p">()</span>
        <span class="n">_base_utilities</span><span class="o">.</span><span class="n">wait_for_idle</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_front</span><span class="p">)</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">_pool</span><span class="o">.</span><span class="n">shutdown</span><span class="p">(</span><span class="n">wait</span><span class="o">=</span><span class="kc">True</span><span class="p">)</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">_rear_link</span> <span class="o">=</span> <span class="kc">None</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">_front</span> <span class="o">=</span> <span class="kc">None</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">_pool</span> <span class="o">=</span> <span class="kc">None</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">_understub</span> <span class="o">=</span> <span class="kc">None</span>
    <span class="k">return</span> <span class="kc">False</span>

  <span class="k">def</span> <span class="nf">__getattr__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">attr</span><span class="p">):</span>
    <span class="k">with</span> <span class="bp">self</span><span class="o">.</span><span class="n">_lock</span><span class="p">:</span>
      <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">_pool</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
        <span class="k">raise</span> <span class="ne">ValueError</span><span class="p">(</span><span class="s1">&#39;Tried to __getattr__ non-__enter__ed Stub!&#39;</span><span class="p">)</span>
      <span class="k">else</span><span class="p">:</span>
        <span class="n">method_cardinality</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_breakdown</span><span class="o">.</span><span class="n">cardinalities</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">attr</span><span class="p">)</span>
        <span class="n">underlying_attr</span> <span class="o">=</span> <span class="nb">getattr</span><span class="p">(</span>
            <span class="bp">self</span><span class="o">.</span><span class="n">_understub</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">_breakdown</span><span class="o">.</span><span class="n">qualified_names</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">attr</span><span class="p">),</span> <span class="kc">None</span><span class="p">)</span>
        <span class="k">if</span> <span class="n">method_cardinality</span> <span class="ow">is</span> <span class="n">interfaces</span><span class="o">.</span><span class="n">Cardinality</span><span class="o">.</span><span class="n">UNARY_UNARY</span><span class="p">:</span>
          <span class="k">return</span> <span class="n">_reexport</span><span class="o">.</span><span class="n">unary_unary_sync_async</span><span class="p">(</span><span class="n">underlying_attr</span><span class="p">)</span>
        <span class="k">elif</span> <span class="n">method_cardinality</span> <span class="ow">is</span> <span class="n">interfaces</span><span class="o">.</span><span class="n">Cardinality</span><span class="o">.</span><span class="n">UNARY_STREAM</span><span class="p">:</span>
          <span class="k">return</span> <span class="k">lambda</span> <span class="n">request</span><span class="p">,</span> <span class="n">timeout</span><span class="p">:</span> <span class="n">_reexport</span><span class="o">.</span><span class="n">cancellable_iterator</span><span class="p">(</span>
              <span class="n">underlying_attr</span><span class="p">(</span><span class="n">request</span><span class="p">,</span> <span class="n">timeout</span><span class="p">))</span>
        <span class="k">elif</span> <span class="n">method_cardinality</span> <span class="ow">is</span> <span class="n">interfaces</span><span class="o">.</span><span class="n">Cardinality</span><span class="o">.</span><span class="n">STREAM_UNARY</span><span class="p">:</span>
          <span class="k">return</span> <span class="n">_reexport</span><span class="o">.</span><span class="n">stream_unary_sync_async</span><span class="p">(</span><span class="n">underlying_attr</span><span class="p">)</span>
        <span class="k">elif</span> <span class="n">method_cardinality</span> <span class="ow">is</span> <span class="n">interfaces</span><span class="o">.</span><span class="n">Cardinality</span><span class="o">.</span><span class="n">STREAM_STREAM</span><span class="p">:</span>
          <span class="k">return</span> <span class="k">lambda</span> <span class="n">request_iterator</span><span class="p">,</span> <span class="n">timeout</span><span class="p">:</span> <span class="p">(</span>
              <span class="n">_reexport</span><span class="o">.</span><span class="n">cancellable_iterator</span><span class="p">(</span><span class="n">underlying_attr</span><span class="p">(</span>
                  <span class="n">request_iterator</span><span class="p">,</span> <span class="n">timeout</span><span class="p">)))</span>
        <span class="k">else</span><span class="p">:</span>
          <span class="k">raise</span> <span class="ne">AttributeError</span><span class="p">(</span><span class="n">attr</span><span class="p">)</span>


<div class="viewcode-block" id="stub"><a class="viewcode-back" href="../../../grpc.early_adopter.html#grpc.early_adopter.implementations.stub">[docs]</a><span class="k">def</span> <span class="nf">stub</span><span class="p">(</span>
    <span class="n">service_name</span><span class="p">,</span> <span class="n">methods</span><span class="p">,</span> <span class="n">host</span><span class="p">,</span> <span class="n">port</span><span class="p">,</span> <span class="n">metadata_transformer</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">secure</span><span class="o">=</span><span class="kc">False</span><span class="p">,</span>
    <span class="n">root_certificates</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">private_key</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">certificate_chain</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span>
    <span class="n">server_host_override</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">thread_pool_size</span><span class="o">=</span><span class="n">_DEFAULT_THREAD_POOL_SIZE</span><span class="p">):</span>
  <span class="sd">&quot;&quot;&quot;Constructs an interfaces.Stub.</span>

<span class="sd">  Args:</span>
<span class="sd">    service_name: The package-qualified full name of the service.</span>
<span class="sd">    methods: A dictionary from RPC method name to</span>
<span class="sd">      interfaces.RpcMethodInvocationDescription describing the RPCs to be</span>
<span class="sd">      supported by the created stub. The RPC method names in the dictionary are</span>
<span class="sd">      not qualified by the service name or decorated in any other way.</span>
<span class="sd">    host: The host to which to connect for RPC service.</span>
<span class="sd">    port: The port to which to connect for RPC service.</span>
<span class="sd">    metadata_transformer: A callable that given a metadata object produces</span>
<span class="sd">      another metadata object to be used in the underlying communication on the</span>
<span class="sd">      wire.</span>
<span class="sd">    secure: Whether or not to construct the stub with a secure connection.</span>
<span class="sd">    root_certificates: The PEM-encoded root certificates or None to ask for</span>
<span class="sd">      them to be retrieved from a default location.</span>
<span class="sd">    private_key: The PEM-encoded private key to use or None if no private key</span>
<span class="sd">      should be used.</span>
<span class="sd">    certificate_chain: The PEM-encoded certificate chain to use or None if no</span>
<span class="sd">      certificate chain should be used.</span>
<span class="sd">    server_host_override: (For testing only) the target name used for SSL</span>
<span class="sd">      host name checking.</span>
<span class="sd">    thread_pool_size: The maximum number of threads to allow in the backing</span>
<span class="sd">      thread pool.</span>

<span class="sd">  Returns:</span>
<span class="sd">    An interfaces.Stub affording RPC invocation.</span>
<span class="sd">  &quot;&quot;&quot;</span>
  <span class="n">breakdown</span> <span class="o">=</span> <span class="n">_face_utilities</span><span class="o">.</span><span class="n">break_down_invocation</span><span class="p">(</span><span class="n">service_name</span><span class="p">,</span> <span class="n">methods</span><span class="p">)</span>
  <span class="k">return</span> <span class="n">_Stub</span><span class="p">(</span>
      <span class="n">breakdown</span><span class="p">,</span> <span class="n">host</span><span class="p">,</span> <span class="n">port</span><span class="p">,</span> <span class="n">secure</span><span class="p">,</span> <span class="n">root_certificates</span><span class="p">,</span> <span class="n">private_key</span><span class="p">,</span>
      <span class="n">certificate_chain</span><span class="p">,</span> <span class="n">server_host_override</span><span class="o">=</span><span class="n">server_host_override</span><span class="p">,</span>
      <span class="n">metadata_transformer</span><span class="o">=</span><span class="n">metadata_transformer</span><span class="p">,</span>
      <span class="n">thread_pool_size</span><span class="o">=</span><span class="n">thread_pool_size</span><span class="p">)</span></div>


<div class="viewcode-block" id="server"><a class="viewcode-back" href="../../../grpc.early_adopter.html#grpc.early_adopter.implementations.server">[docs]</a><span class="k">def</span> <span class="nf">server</span><span class="p">(</span>
    <span class="n">service_name</span><span class="p">,</span> <span class="n">methods</span><span class="p">,</span> <span class="n">port</span><span class="p">,</span> <span class="n">private_key</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">certificate_chain</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span>
    <span class="n">thread_pool_size</span><span class="o">=</span><span class="n">_DEFAULT_THREAD_POOL_SIZE</span><span class="p">):</span>
  <span class="sd">&quot;&quot;&quot;Constructs an interfaces.Server.</span>

<span class="sd">  Args:</span>
<span class="sd">    service_name: The package-qualified full name of the service.</span>
<span class="sd">    methods: A dictionary from RPC method name to</span>
<span class="sd">      interfaces.RpcMethodServiceDescription describing the RPCs to</span>
<span class="sd">      be serviced by the created server. The RPC method names in the dictionary</span>
<span class="sd">      are not qualified by the service name or decorated in any other way.</span>
<span class="sd">    port: The port on which to serve or zero to ask for a port to be</span>
<span class="sd">      automatically selected.</span>
<span class="sd">    private_key: A pem-encoded private key, or None for an insecure server.</span>
<span class="sd">    certificate_chain: A pem-encoded certificate chain, or None for an insecure</span>
<span class="sd">      server.</span>
<span class="sd">    thread_pool_size: The maximum number of threads to allow in the backing</span>
<span class="sd">      thread pool.</span>

<span class="sd">  Returns:</span>
<span class="sd">    An interfaces.Server that will serve secure traffic.</span>
<span class="sd">  &quot;&quot;&quot;</span>
  <span class="n">breakdown</span> <span class="o">=</span> <span class="n">_face_utilities</span><span class="o">.</span><span class="n">break_down_service</span><span class="p">(</span><span class="n">service_name</span><span class="p">,</span> <span class="n">methods</span><span class="p">)</span>
  <span class="k">return</span> <span class="n">_Server</span><span class="p">(</span><span class="n">breakdown</span><span class="p">,</span> <span class="n">port</span><span class="p">,</span> <span class="n">private_key</span><span class="p">,</span> <span class="n">certificate_chain</span><span class="p">,</span>
      <span class="n">thread_pool_size</span><span class="o">=</span><span class="n">thread_pool_size</span><span class="p">)</span></div>
</pre></div>

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