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  <h1>Source code for grpc.framework.foundation.stream_util</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;Helpful utilities related to the stream module.&quot;&quot;&quot;</span>

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

<span class="kn">from</span> <span class="nn">grpc.framework.foundation</span> <span class="k">import</span> <span class="n">stream</span>

<span class="n">_NO_VALUE</span> <span class="o">=</span> <span class="nb">object</span><span class="p">()</span>


<div class="viewcode-block" id="TransformingConsumer"><a class="viewcode-back" href="../../../../grpc.framework.foundation.html#grpc.framework.foundation.stream_util.TransformingConsumer">[docs]</a><span class="k">class</span> <span class="nc">TransformingConsumer</span><span class="p">(</span><span class="n">stream</span><span class="o">.</span><span class="n">Consumer</span><span class="p">):</span>
  <span class="sd">&quot;&quot;&quot;A stream.Consumer that passes a transformation of its input to another.&quot;&quot;&quot;</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">transformation</span><span class="p">,</span> <span class="n">downstream</span><span class="p">):</span>
    <span class="bp">self</span><span class="o">.</span><span class="n">_transformation</span> <span class="o">=</span> <span class="n">transformation</span>
    <span class="bp">self</span><span class="o">.</span><span class="n">_downstream</span> <span class="o">=</span> <span class="n">downstream</span>

<div class="viewcode-block" id="TransformingConsumer.consume"><a class="viewcode-back" href="../../../../grpc.framework.foundation.html#grpc.framework.foundation.stream_util.TransformingConsumer.consume">[docs]</a>  <span class="k">def</span> <span class="nf">consume</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">value</span><span class="p">):</span>
    <span class="bp">self</span><span class="o">.</span><span class="n">_downstream</span><span class="o">.</span><span class="n">consume</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_transformation</span><span class="p">(</span><span class="n">value</span><span class="p">))</span></div>

<div class="viewcode-block" id="TransformingConsumer.terminate"><a class="viewcode-back" href="../../../../grpc.framework.foundation.html#grpc.framework.foundation.stream_util.TransformingConsumer.terminate">[docs]</a>  <span class="k">def</span> <span class="nf">terminate</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">_downstream</span><span class="o">.</span><span class="n">terminate</span><span class="p">()</span></div>

<div class="viewcode-block" id="TransformingConsumer.consume_and_terminate"><a class="viewcode-back" href="../../../../grpc.framework.foundation.html#grpc.framework.foundation.stream_util.TransformingConsumer.consume_and_terminate">[docs]</a>  <span class="k">def</span> <span class="nf">consume_and_terminate</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">value</span><span class="p">):</span>
    <span class="bp">self</span><span class="o">.</span><span class="n">_downstream</span><span class="o">.</span><span class="n">consume_and_terminate</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_transformation</span><span class="p">(</span><span class="n">value</span><span class="p">))</span></div></div>


<div class="viewcode-block" id="IterableConsumer"><a class="viewcode-back" href="../../../../grpc.framework.foundation.html#grpc.framework.foundation.stream_util.IterableConsumer">[docs]</a><span class="k">class</span> <span class="nc">IterableConsumer</span><span class="p">(</span><span class="n">stream</span><span class="o">.</span><span class="n">Consumer</span><span class="p">):</span>
  <span class="sd">&quot;&quot;&quot;A Consumer that when iterated over emits the values it has consumed.&quot;&quot;&quot;</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="bp">self</span><span class="o">.</span><span class="n">_condition</span> <span class="o">=</span> <span class="n">threading</span><span class="o">.</span><span class="n">Condition</span><span class="p">()</span>
    <span class="bp">self</span><span class="o">.</span><span class="n">_values</span> <span class="o">=</span> <span class="p">[]</span>
    <span class="bp">self</span><span class="o">.</span><span class="n">_active</span> <span class="o">=</span> <span class="kc">True</span>

<div class="viewcode-block" id="IterableConsumer.consume"><a class="viewcode-back" href="../../../../grpc.framework.foundation.html#grpc.framework.foundation.stream_util.IterableConsumer.consume">[docs]</a>  <span class="k">def</span> <span class="nf">consume</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">stock_reply</span><span class="p">):</span>
    <span class="k">with</span> <span class="bp">self</span><span class="o">.</span><span class="n">_condition</span><span class="p">:</span>
      <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">_active</span><span class="p">:</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">_values</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">stock_reply</span><span class="p">)</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">_condition</span><span class="o">.</span><span class="n">notify</span><span class="p">()</span></div>

<div class="viewcode-block" id="IterableConsumer.terminate"><a class="viewcode-back" href="../../../../grpc.framework.foundation.html#grpc.framework.foundation.stream_util.IterableConsumer.terminate">[docs]</a>  <span class="k">def</span> <span class="nf">terminate</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">_condition</span><span class="p">:</span>
      <span class="bp">self</span><span class="o">.</span><span class="n">_active</span> <span class="o">=</span> <span class="kc">False</span>
      <span class="bp">self</span><span class="o">.</span><span class="n">_condition</span><span class="o">.</span><span class="n">notify</span><span class="p">()</span></div>

<div class="viewcode-block" id="IterableConsumer.consume_and_terminate"><a class="viewcode-back" href="../../../../grpc.framework.foundation.html#grpc.framework.foundation.stream_util.IterableConsumer.consume_and_terminate">[docs]</a>  <span class="k">def</span> <span class="nf">consume_and_terminate</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">stock_reply</span><span class="p">):</span>
    <span class="k">with</span> <span class="bp">self</span><span class="o">.</span><span class="n">_condition</span><span class="p">:</span>
      <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">_active</span><span class="p">:</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">_values</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">stock_reply</span><span class="p">)</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">_active</span> <span class="o">=</span> <span class="kc">False</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">_condition</span><span class="o">.</span><span class="n">notify</span><span class="p">()</span></div>

  <span class="k">def</span> <span class="nf">__iter__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
    <span class="k">return</span> <span class="bp">self</span>

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

<div class="viewcode-block" id="IterableConsumer.next"><a class="viewcode-back" href="../../../../grpc.framework.foundation.html#grpc.framework.foundation.stream_util.IterableConsumer.next">[docs]</a>  <span class="k">def</span> <span class="nf">next</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">_condition</span><span class="p">:</span>
      <span class="k">while</span> <span class="bp">self</span><span class="o">.</span><span class="n">_active</span> <span class="ow">and</span> <span class="ow">not</span> <span class="bp">self</span><span class="o">.</span><span class="n">_values</span><span class="p">:</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">_condition</span><span class="o">.</span><span class="n">wait</span><span class="p">()</span>
      <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">_values</span><span class="p">:</span>
        <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">_values</span><span class="o">.</span><span class="n">pop</span><span class="p">(</span><span class="mi">0</span><span class="p">)</span>
      <span class="k">else</span><span class="p">:</span>
        <span class="k">raise</span> <span class="ne">StopIteration</span><span class="p">()</span></div></div>


<div class="viewcode-block" id="ThreadSwitchingConsumer"><a class="viewcode-back" href="../../../../grpc.framework.foundation.html#grpc.framework.foundation.stream_util.ThreadSwitchingConsumer">[docs]</a><span class="k">class</span> <span class="nc">ThreadSwitchingConsumer</span><span class="p">(</span><span class="n">stream</span><span class="o">.</span><span class="n">Consumer</span><span class="p">):</span>
  <span class="sd">&quot;&quot;&quot;A Consumer decorator that affords serialization and asynchrony.&quot;&quot;&quot;</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">sink</span><span class="p">,</span> <span class="n">pool</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">_sink</span> <span class="o">=</span> <span class="n">sink</span>
    <span class="bp">self</span><span class="o">.</span><span class="n">_pool</span> <span class="o">=</span> <span class="n">pool</span>
    <span class="c1"># True if self._spin has been submitted to the pool to be called once and</span>
    <span class="c1"># that call has not yet returned, False otherwise.</span>
    <span class="bp">self</span><span class="o">.</span><span class="n">_spinning</span> <span class="o">=</span> <span class="kc">False</span>
    <span class="bp">self</span><span class="o">.</span><span class="n">_values</span> <span class="o">=</span> <span class="p">[]</span>
    <span class="bp">self</span><span class="o">.</span><span class="n">_active</span> <span class="o">=</span> <span class="kc">True</span>

  <span class="k">def</span> <span class="nf">_spin</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">sink</span><span class="p">,</span> <span class="n">value</span><span class="p">,</span> <span class="n">terminate</span><span class="p">):</span>
    <span class="k">while</span> <span class="kc">True</span><span class="p">:</span>
      <span class="k">try</span><span class="p">:</span>
        <span class="k">if</span> <span class="n">value</span> <span class="ow">is</span> <span class="n">_NO_VALUE</span><span class="p">:</span>
          <span class="n">sink</span><span class="o">.</span><span class="n">terminate</span><span class="p">()</span>
        <span class="k">elif</span> <span class="n">terminate</span><span class="p">:</span>
          <span class="n">sink</span><span class="o">.</span><span class="n">consume_and_terminate</span><span class="p">(</span><span class="n">value</span><span class="p">)</span>
        <span class="k">else</span><span class="p">:</span>
          <span class="n">sink</span><span class="o">.</span><span class="n">consume</span><span class="p">(</span><span class="n">value</span><span class="p">)</span>
      <span class="k">except</span> <span class="ne">Exception</span> <span class="k">as</span> <span class="n">e</span><span class="p">:</span>  <span class="c1"># pylint:disable=broad-except</span>
        <span class="n">logging</span><span class="o">.</span><span class="n">exception</span><span class="p">(</span><span class="n">e</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="n">terminate</span><span class="p">:</span>
          <span class="bp">self</span><span class="o">.</span><span class="n">_spinning</span> <span class="o">=</span> <span class="kc">False</span>
          <span class="k">return</span>
        <span class="k">elif</span> <span class="bp">self</span><span class="o">.</span><span class="n">_values</span><span class="p">:</span>
          <span class="n">value</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_values</span><span class="o">.</span><span class="n">pop</span><span class="p">(</span><span class="mi">0</span><span class="p">)</span>
          <span class="n">terminate</span> <span class="o">=</span> <span class="ow">not</span> <span class="bp">self</span><span class="o">.</span><span class="n">_values</span> <span class="ow">and</span> <span class="ow">not</span> <span class="bp">self</span><span class="o">.</span><span class="n">_active</span>
        <span class="k">elif</span> <span class="ow">not</span> <span class="bp">self</span><span class="o">.</span><span class="n">_active</span><span class="p">:</span>
          <span class="n">value</span> <span class="o">=</span> <span class="n">_NO_VALUE</span>
          <span class="n">terminate</span> <span class="o">=</span> <span class="kc">True</span>
        <span class="k">else</span><span class="p">:</span>
          <span class="bp">self</span><span class="o">.</span><span class="n">_spinning</span> <span class="o">=</span> <span class="kc">False</span>
          <span class="k">return</span>

<div class="viewcode-block" id="ThreadSwitchingConsumer.consume"><a class="viewcode-back" href="../../../../grpc.framework.foundation.html#grpc.framework.foundation.stream_util.ThreadSwitchingConsumer.consume">[docs]</a>  <span class="k">def</span> <span class="nf">consume</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">value</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">_active</span><span class="p">:</span>
        <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">_spinning</span><span class="p">:</span>
          <span class="bp">self</span><span class="o">.</span><span class="n">_values</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">value</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">_pool</span><span class="o">.</span><span class="n">submit</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_spin</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">_sink</span><span class="p">,</span> <span class="n">value</span><span class="p">,</span> <span class="kc">False</span><span class="p">)</span>
          <span class="bp">self</span><span class="o">.</span><span class="n">_spinning</span> <span class="o">=</span> <span class="kc">True</span></div>

<div class="viewcode-block" id="ThreadSwitchingConsumer.terminate"><a class="viewcode-back" href="../../../../grpc.framework.foundation.html#grpc.framework.foundation.stream_util.ThreadSwitchingConsumer.terminate">[docs]</a>  <span class="k">def</span> <span class="nf">terminate</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">_active</span><span class="p">:</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">_active</span> <span class="o">=</span> <span class="kc">False</span>
        <span class="k">if</span> <span class="ow">not</span> <span class="bp">self</span><span class="o">.</span><span class="n">_spinning</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">submit</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_spin</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">_sink</span><span class="p">,</span> <span class="n">_NO_VALUE</span><span class="p">,</span> <span class="kc">True</span><span class="p">)</span>
          <span class="bp">self</span><span class="o">.</span><span class="n">_spinning</span> <span class="o">=</span> <span class="kc">True</span></div>

<div class="viewcode-block" id="ThreadSwitchingConsumer.consume_and_terminate"><a class="viewcode-back" href="../../../../grpc.framework.foundation.html#grpc.framework.foundation.stream_util.ThreadSwitchingConsumer.consume_and_terminate">[docs]</a>  <span class="k">def</span> <span class="nf">consume_and_terminate</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">value</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">_active</span><span class="p">:</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">_active</span> <span class="o">=</span> <span class="kc">False</span>
        <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">_spinning</span><span class="p">:</span>
          <span class="bp">self</span><span class="o">.</span><span class="n">_values</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">value</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">_pool</span><span class="o">.</span><span class="n">submit</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_spin</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">_sink</span><span class="p">,</span> <span class="n">value</span><span class="p">,</span> <span class="kc">True</span><span class="p">)</span>
          <span class="bp">self</span><span class="o">.</span><span class="n">_spinning</span> <span class="o">=</span> <span class="kc">True</span></div></div>
</pre></div>

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