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  <h1>Source code for grpc_health.v1.health</h1><div class="highlight"><pre>
<span></span><span class="c1"># Copyright 2015 gRPC authors.</span>
<span class="c1">#</span>
<span class="c1"># Licensed under the Apache License, Version 2.0 (the &quot;License&quot;);</span>
<span class="c1"># you may not use this file except in compliance with the License.</span>
<span class="c1"># You may obtain a copy of the License at</span>
<span class="c1">#</span>
<span class="c1">#     http://www.apache.org/licenses/LICENSE-2.0</span>
<span class="c1">#</span>
<span class="c1"># Unless required by applicable law or agreed to in writing, software</span>
<span class="c1"># distributed under the License is distributed on an &quot;AS IS&quot; BASIS,</span>
<span class="c1"># WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span>
<span class="c1"># See the License for the specific language governing permissions and</span>
<span class="c1"># limitations under the License.</span>
<span class="sd">&quot;&quot;&quot;Reference implementation for health checking in gRPC Python.&quot;&quot;&quot;</span>

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

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

<span class="kn">from</span> <span class="nn">grpc_health.v1</span> <span class="k">import</span> <span class="n">health_pb2</span> <span class="k">as</span> <span class="n">_health_pb2</span>
<span class="kn">from</span> <span class="nn">grpc_health.v1</span> <span class="k">import</span> <span class="n">health_pb2_grpc</span> <span class="k">as</span> <span class="n">_health_pb2_grpc</span>

<span class="n">SERVICE_NAME</span> <span class="o">=</span> <span class="n">_health_pb2</span><span class="o">.</span><span class="n">DESCRIPTOR</span><span class="o">.</span><span class="n">services_by_name</span><span class="p">[</span><span class="s1">&#39;Health&#39;</span><span class="p">]</span><span class="o">.</span><span class="n">full_name</span>


<span class="k">class</span> <span class="nc">_Watcher</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="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">_responses</span> <span class="o">=</span> <span class="n">collections</span><span class="o">.</span><span class="n">deque</span><span class="p">()</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">_open</span> <span class="o">=</span> <span class="kc">True</span>

    <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">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="ow">not</span> <span class="bp">self</span><span class="o">.</span><span class="n">_responses</span> <span class="ow">and</span> <span class="bp">self</span><span class="o">.</span><span class="n">_open</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">_responses</span><span class="p">:</span>
                <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">_responses</span><span class="o">.</span><span class="n">popleft</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>

    <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>

    <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>

    <span class="k">def</span> <span class="nf">add</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">response</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">_responses</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">response</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>

    <span class="k">def</span> <span class="nf">close</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">_open</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>


<span class="k">def</span> <span class="nf">_watcher_to_send_response_callback_adapter</span><span class="p">(</span><span class="n">watcher</span><span class="p">):</span>

    <span class="k">def</span> <span class="nf">send_response_callback</span><span class="p">(</span><span class="n">response</span><span class="p">):</span>
        <span class="k">if</span> <span class="n">response</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
            <span class="n">watcher</span><span class="o">.</span><span class="n">close</span><span class="p">()</span>
        <span class="k">else</span><span class="p">:</span>
            <span class="n">watcher</span><span class="o">.</span><span class="n">add</span><span class="p">(</span><span class="n">response</span><span class="p">)</span>

    <span class="k">return</span> <span class="n">send_response_callback</span>


<div class="viewcode-block" id="HealthServicer"><a class="viewcode-back" href="../../../grpc_health_checking.html#grpc_health.v1.health.HealthServicer">[docs]</a><span class="k">class</span> <span class="nc">HealthServicer</span><span class="p">(</span><span class="n">_health_pb2_grpc</span><span class="o">.</span><span class="n">HealthServicer</span><span class="p">):</span>
    <span class="sd">&quot;&quot;&quot;Servicer handling RPCs for service statuses.&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">experimental_non_blocking</span><span class="o">=</span><span class="kc">True</span><span class="p">,</span>
                 <span class="n">experimental_thread_pool</span><span class="o">=</span><span class="kc">None</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">RLock</span><span class="p">()</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">_server_status</span> <span class="o">=</span> <span class="p">{}</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">_send_response_callbacks</span> <span class="o">=</span> <span class="p">{}</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">Watch</span><span class="o">.</span><span class="vm">__func__</span><span class="o">.</span><span class="n">experimental_non_blocking</span> <span class="o">=</span> <span class="n">experimental_non_blocking</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">Watch</span><span class="o">.</span><span class="vm">__func__</span><span class="o">.</span><span class="n">experimental_thread_pool</span> <span class="o">=</span> <span class="n">experimental_thread_pool</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">_gracefully_shutting_down</span> <span class="o">=</span> <span class="kc">False</span>

    <span class="k">def</span> <span class="nf">_on_close_callback</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">send_response_callback</span><span class="p">,</span> <span class="n">service</span><span class="p">):</span>

        <span class="k">def</span> <span class="nf">callback</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="bp">self</span><span class="o">.</span><span class="n">_send_response_callbacks</span><span class="p">[</span><span class="n">service</span><span class="p">]</span><span class="o">.</span><span class="n">remove</span><span class="p">(</span>
                    <span class="n">send_response_callback</span><span class="p">)</span>
            <span class="n">send_response_callback</span><span class="p">(</span><span class="kc">None</span><span class="p">)</span>

        <span class="k">return</span> <span class="n">callback</span>

    <span class="k">def</span> <span class="nf">Check</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">request</span><span class="p">,</span> <span class="n">context</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="n">status</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_server_status</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">request</span><span class="o">.</span><span class="n">service</span><span class="p">)</span>
            <span class="k">if</span> <span class="n">status</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
                <span class="n">context</span><span class="o">.</span><span class="n">set_code</span><span class="p">(</span><span class="n">grpc</span><span class="o">.</span><span class="n">StatusCode</span><span class="o">.</span><span class="n">NOT_FOUND</span><span class="p">)</span>
                <span class="k">return</span> <span class="n">_health_pb2</span><span class="o">.</span><span class="n">HealthCheckResponse</span><span class="p">()</span>
            <span class="k">else</span><span class="p">:</span>
                <span class="k">return</span> <span class="n">_health_pb2</span><span class="o">.</span><span class="n">HealthCheckResponse</span><span class="p">(</span><span class="n">status</span><span class="o">=</span><span class="n">status</span><span class="p">)</span>

    <span class="c1"># pylint: disable=arguments-differ</span>
    <span class="k">def</span> <span class="nf">Watch</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">request</span><span class="p">,</span> <span class="n">context</span><span class="p">,</span> <span class="n">send_response_callback</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
        <span class="n">blocking_watcher</span> <span class="o">=</span> <span class="kc">None</span>
        <span class="k">if</span> <span class="n">send_response_callback</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
            <span class="c1"># The server does not support the experimental_non_blocking</span>
            <span class="c1"># parameter. For backwards compatibility, return a blocking response</span>
            <span class="c1"># generator.</span>
            <span class="n">blocking_watcher</span> <span class="o">=</span> <span class="n">_Watcher</span><span class="p">()</span>
            <span class="n">send_response_callback</span> <span class="o">=</span> <span class="n">_watcher_to_send_response_callback_adapter</span><span class="p">(</span>
                <span class="n">blocking_watcher</span><span class="p">)</span>
        <span class="n">service</span> <span class="o">=</span> <span class="n">request</span><span class="o">.</span><span class="n">service</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="n">status</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_server_status</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">service</span><span class="p">)</span>
            <span class="k">if</span> <span class="n">status</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
                <span class="n">status</span> <span class="o">=</span> <span class="n">_health_pb2</span><span class="o">.</span><span class="n">HealthCheckResponse</span><span class="o">.</span><span class="n">SERVICE_UNKNOWN</span>  <span class="c1"># pylint: disable=no-member</span>
            <span class="n">send_response_callback</span><span class="p">(</span>
                <span class="n">_health_pb2</span><span class="o">.</span><span class="n">HealthCheckResponse</span><span class="p">(</span><span class="n">status</span><span class="o">=</span><span class="n">status</span><span class="p">))</span>
            <span class="k">if</span> <span class="n">service</span> <span class="ow">not</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">_send_response_callbacks</span><span class="p">:</span>
                <span class="bp">self</span><span class="o">.</span><span class="n">_send_response_callbacks</span><span class="p">[</span><span class="n">service</span><span class="p">]</span> <span class="o">=</span> <span class="nb">set</span><span class="p">()</span>
            <span class="bp">self</span><span class="o">.</span><span class="n">_send_response_callbacks</span><span class="p">[</span><span class="n">service</span><span class="p">]</span><span class="o">.</span><span class="n">add</span><span class="p">(</span><span class="n">send_response_callback</span><span class="p">)</span>
            <span class="n">context</span><span class="o">.</span><span class="n">add_callback</span><span class="p">(</span>
                <span class="bp">self</span><span class="o">.</span><span class="n">_on_close_callback</span><span class="p">(</span><span class="n">send_response_callback</span><span class="p">,</span> <span class="n">service</span><span class="p">))</span>
        <span class="k">return</span> <span class="n">blocking_watcher</span>

<div class="viewcode-block" id="HealthServicer.set"><a class="viewcode-back" href="../../../grpc_health_checking.html#grpc_health.v1.health.HealthServicer.set">[docs]</a>    <span class="k">def</span> <span class="nf">set</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">service</span><span class="p">,</span> <span class="n">status</span><span class="p">):</span>
        <span class="sd">&quot;&quot;&quot;Sets the status of a service.</span>

<span class="sd">        Args:</span>
<span class="sd">          service: string, the name of the service. NOTE, &#39;&#39; must be set.</span>
<span class="sd">          status: HealthCheckResponse.status enum value indicating the status of</span>
<span class="sd">            the service</span>
<span class="sd">        &quot;&quot;&quot;</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">_gracefully_shutting_down</span><span class="p">:</span>
                <span class="k">return</span>
            <span class="k">else</span><span class="p">:</span>
                <span class="bp">self</span><span class="o">.</span><span class="n">_server_status</span><span class="p">[</span><span class="n">service</span><span class="p">]</span> <span class="o">=</span> <span class="n">status</span>
                <span class="k">if</span> <span class="n">service</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">_send_response_callbacks</span><span class="p">:</span>
                    <span class="k">for</span> <span class="n">send_response_callback</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">_send_response_callbacks</span><span class="p">[</span>
                            <span class="n">service</span><span class="p">]:</span>
                        <span class="n">send_response_callback</span><span class="p">(</span>
                            <span class="n">_health_pb2</span><span class="o">.</span><span class="n">HealthCheckResponse</span><span class="p">(</span><span class="n">status</span><span class="o">=</span><span class="n">status</span><span class="p">))</span></div>

<div class="viewcode-block" id="HealthServicer.enter_graceful_shutdown"><a class="viewcode-back" href="../../../grpc_health_checking.html#grpc_health.v1.health.HealthServicer.enter_graceful_shutdown">[docs]</a>    <span class="k">def</span> <span class="nf">enter_graceful_shutdown</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
        <span class="sd">&quot;&quot;&quot;Permanently sets the status of all services to NOT_SERVING.</span>

<span class="sd">        This should be invoked when the server is entering a graceful shutdown</span>
<span class="sd">        period. After this method is invoked, future attempts to set the status</span>
<span class="sd">        of a service will be ignored.</span>

<span class="sd">        This is an EXPERIMENTAL API.</span>
<span class="sd">        &quot;&quot;&quot;</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">_gracefully_shutting_down</span><span class="p">:</span>
                <span class="k">return</span>
            <span class="k">else</span><span class="p">:</span>
                <span class="k">for</span> <span class="n">service</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">_server_status</span><span class="p">:</span>
                    <span class="bp">self</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="n">service</span><span class="p">,</span>
                             <span class="n">_health_pb2</span><span class="o">.</span><span class="n">HealthCheckResponse</span><span class="o">.</span><span class="n">NOT_SERVING</span><span class="p">)</span>  <span class="c1"># pylint: disable=no-member</span>
                <span class="bp">self</span><span class="o">.</span><span class="n">_gracefully_shutting_down</span> <span class="o">=</span> <span class="kc">True</span></div></div>
</pre></div>

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