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  <h1>Source code for grpc_tools.protoc</h1><div class="highlight"><pre>
<span></span><span class="ch">#!/usr/bin/env python</span>

<span class="c1"># Copyright 2016 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="kn">import</span> <span class="nn">pkg_resources</span>
<span class="kn">import</span> <span class="nn">sys</span>

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

<span class="kn">from</span> <span class="nn">grpc_tools</span> <span class="kn">import</span> <span class="n">_protoc_compiler</span>

<span class="n">_PROTO_MODULE_SUFFIX</span> <span class="o">=</span> <span class="s2">&quot;_pb2&quot;</span>
<span class="n">_SERVICE_MODULE_SUFFIX</span> <span class="o">=</span> <span class="s2">&quot;_pb2_grpc&quot;</span>

<span class="n">_DISABLE_DYNAMIC_STUBS</span> <span class="o">=</span> <span class="s2">&quot;GRPC_PYTHON_DISABLE_DYNAMIC_STUBS&quot;</span>


<span class="k">def</span> <span class="nf">main</span><span class="p">(</span><span class="n">command_arguments</span><span class="p">):</span>
    <span class="sd">&quot;&quot;&quot;Run the protocol buffer compiler with the given command-line arguments.</span>

<span class="sd">  Args:</span>
<span class="sd">    command_arguments: a list of strings representing command line arguments to</span>
<span class="sd">        `protoc`.</span>
<span class="sd">  &quot;&quot;&quot;</span>
    <span class="n">command_arguments</span> <span class="o">=</span> <span class="p">[</span><span class="n">argument</span><span class="o">.</span><span class="n">encode</span><span class="p">()</span> <span class="k">for</span> <span class="n">argument</span> <span class="ow">in</span> <span class="n">command_arguments</span><span class="p">]</span>
    <span class="k">return</span> <span class="n">_protoc_compiler</span><span class="o">.</span><span class="n">run_main</span><span class="p">(</span><span class="n">command_arguments</span><span class="p">)</span>


<span class="c1"># NOTE(rbellevi): importlib.abc is not supported on 3.4.</span>
<span class="k">if</span> <span class="n">sys</span><span class="o">.</span><span class="n">version_info</span> <span class="o">&gt;=</span> <span class="p">(</span><span class="mi">3</span><span class="p">,</span> <span class="mi">5</span><span class="p">,</span> <span class="mi">0</span><span class="p">):</span>
    <span class="kn">import</span> <span class="nn">contextlib</span>
    <span class="kn">import</span> <span class="nn">importlib</span>
    <span class="kn">import</span> <span class="nn">importlib.machinery</span>
    <span class="kn">import</span> <span class="nn">threading</span>

    <span class="n">_FINDERS_INSTALLED</span> <span class="o">=</span> <span class="kc">False</span>
    <span class="n">_FINDERS_INSTALLED_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="k">def</span> <span class="nf">_maybe_install_proto_finders</span><span class="p">():</span>
        <span class="k">global</span> <span class="n">_FINDERS_INSTALLED</span>
        <span class="k">with</span> <span class="n">_FINDERS_INSTALLED_LOCK</span><span class="p">:</span>
            <span class="k">if</span> <span class="ow">not</span> <span class="n">_FINDERS_INSTALLED</span><span class="p">:</span>
                <span class="n">sys</span><span class="o">.</span><span class="n">meta_path</span><span class="o">.</span><span class="n">extend</span><span class="p">([</span>
                    <span class="n">ProtoFinder</span><span class="p">(</span><span class="n">_PROTO_MODULE_SUFFIX</span><span class="p">,</span>
                                <span class="n">_protoc_compiler</span><span class="o">.</span><span class="n">get_protos</span><span class="p">),</span>
                    <span class="n">ProtoFinder</span><span class="p">(</span><span class="n">_SERVICE_MODULE_SUFFIX</span><span class="p">,</span>
                                <span class="n">_protoc_compiler</span><span class="o">.</span><span class="n">get_services</span><span class="p">)</span>
                <span class="p">])</span>
                <span class="n">_FINDERS_INSTALLED</span> <span class="o">=</span> <span class="kc">True</span>

    <span class="k">def</span> <span class="nf">_module_name_to_proto_file</span><span class="p">(</span><span class="n">suffix</span><span class="p">,</span> <span class="n">module_name</span><span class="p">):</span>
        <span class="n">components</span> <span class="o">=</span> <span class="n">module_name</span><span class="o">.</span><span class="n">split</span><span class="p">(</span><span class="s2">&quot;.&quot;</span><span class="p">)</span>
        <span class="n">proto_name</span> <span class="o">=</span> <span class="n">components</span><span class="p">[</span><span class="o">-</span><span class="mi">1</span><span class="p">][:</span><span class="o">-</span><span class="mi">1</span> <span class="o">*</span> <span class="nb">len</span><span class="p">(</span><span class="n">suffix</span><span class="p">)]</span>
        <span class="c1"># NOTE(rbellevi): The Protobuf library expects this path to use</span>
        <span class="c1"># forward slashes on every platform.</span>
        <span class="k">return</span> <span class="s2">&quot;/&quot;</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">components</span><span class="p">[:</span><span class="o">-</span><span class="mi">1</span><span class="p">]</span> <span class="o">+</span> <span class="p">[</span><span class="n">proto_name</span> <span class="o">+</span> <span class="s2">&quot;.proto&quot;</span><span class="p">])</span>

    <span class="k">def</span> <span class="nf">_proto_file_to_module_name</span><span class="p">(</span><span class="n">suffix</span><span class="p">,</span> <span class="n">proto_file</span><span class="p">):</span>
        <span class="n">components</span> <span class="o">=</span> <span class="n">proto_file</span><span class="o">.</span><span class="n">split</span><span class="p">(</span><span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">sep</span><span class="p">)</span>
        <span class="n">proto_base_name</span> <span class="o">=</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">splitext</span><span class="p">(</span><span class="n">components</span><span class="p">[</span><span class="o">-</span><span class="mi">1</span><span class="p">])[</span><span class="mi">0</span><span class="p">]</span>
        <span class="k">return</span> <span class="s2">&quot;.&quot;</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">components</span><span class="p">[:</span><span class="o">-</span><span class="mi">1</span><span class="p">]</span> <span class="o">+</span> <span class="p">[</span><span class="n">proto_base_name</span> <span class="o">+</span> <span class="n">suffix</span><span class="p">])</span>

    <span class="k">def</span> <span class="nf">_protos</span><span class="p">(</span><span class="n">protobuf_path</span><span class="p">):</span>
        <span class="sd">&quot;&quot;&quot;Returns a gRPC module generated from the indicated proto file.&quot;&quot;&quot;</span>
        <span class="n">_maybe_install_proto_finders</span><span class="p">()</span>
        <span class="n">module_name</span> <span class="o">=</span> <span class="n">_proto_file_to_module_name</span><span class="p">(</span><span class="n">_PROTO_MODULE_SUFFIX</span><span class="p">,</span>
                                                 <span class="n">protobuf_path</span><span class="p">)</span>
        <span class="n">module</span> <span class="o">=</span> <span class="n">importlib</span><span class="o">.</span><span class="n">import_module</span><span class="p">(</span><span class="n">module_name</span><span class="p">)</span>
        <span class="k">return</span> <span class="n">module</span>

    <span class="k">def</span> <span class="nf">_services</span><span class="p">(</span><span class="n">protobuf_path</span><span class="p">):</span>
        <span class="sd">&quot;&quot;&quot;Returns a module generated from the indicated proto file.&quot;&quot;&quot;</span>
        <span class="n">_maybe_install_proto_finders</span><span class="p">()</span>
        <span class="n">_protos</span><span class="p">(</span><span class="n">protobuf_path</span><span class="p">)</span>
        <span class="n">module_name</span> <span class="o">=</span> <span class="n">_proto_file_to_module_name</span><span class="p">(</span><span class="n">_SERVICE_MODULE_SUFFIX</span><span class="p">,</span>
                                                 <span class="n">protobuf_path</span><span class="p">)</span>
        <span class="n">module</span> <span class="o">=</span> <span class="n">importlib</span><span class="o">.</span><span class="n">import_module</span><span class="p">(</span><span class="n">module_name</span><span class="p">)</span>
        <span class="k">return</span> <span class="n">module</span>

    <span class="k">def</span> <span class="nf">_protos_and_services</span><span class="p">(</span><span class="n">protobuf_path</span><span class="p">):</span>
        <span class="sd">&quot;&quot;&quot;Returns two modules, corresponding to _pb2.py and _pb2_grpc.py files.&quot;&quot;&quot;</span>
        <span class="k">return</span> <span class="p">(</span><span class="n">_protos</span><span class="p">(</span><span class="n">protobuf_path</span><span class="p">),</span> <span class="n">_services</span><span class="p">(</span><span class="n">protobuf_path</span><span class="p">))</span>

    <span class="n">_proto_code_cache</span> <span class="o">=</span> <span class="p">{}</span>
    <span class="n">_proto_code_cache_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="k">class</span> <span class="nc">ProtoLoader</span><span class="p">(</span><span class="n">importlib</span><span class="o">.</span><span class="n">abc</span><span class="o">.</span><span class="n">Loader</span><span class="p">):</span>

        <span class="k">def</span> <span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">suffix</span><span class="p">,</span> <span class="n">codegen_fn</span><span class="p">,</span> <span class="n">module_name</span><span class="p">,</span> <span class="n">protobuf_path</span><span class="p">,</span>
                     <span class="n">proto_root</span><span class="p">):</span>
            <span class="bp">self</span><span class="o">.</span><span class="n">_suffix</span> <span class="o">=</span> <span class="n">suffix</span>
            <span class="bp">self</span><span class="o">.</span><span class="n">_codegen_fn</span> <span class="o">=</span> <span class="n">codegen_fn</span>
            <span class="bp">self</span><span class="o">.</span><span class="n">_module_name</span> <span class="o">=</span> <span class="n">module_name</span>
            <span class="bp">self</span><span class="o">.</span><span class="n">_protobuf_path</span> <span class="o">=</span> <span class="n">protobuf_path</span>
            <span class="bp">self</span><span class="o">.</span><span class="n">_proto_root</span> <span class="o">=</span> <span class="n">proto_root</span>

        <span class="k">def</span> <span class="nf">create_module</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">spec</span><span class="p">):</span>
            <span class="k">return</span> <span class="kc">None</span>

        <span class="k">def</span> <span class="nf">_generated_file_to_module_name</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">filepath</span><span class="p">):</span>
            <span class="n">components</span> <span class="o">=</span> <span class="n">filepath</span><span class="o">.</span><span class="n">split</span><span class="p">(</span><span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">sep</span><span class="p">)</span>
            <span class="k">return</span> <span class="s2">&quot;.&quot;</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">components</span><span class="p">[:</span><span class="o">-</span><span class="mi">1</span><span class="p">]</span> <span class="o">+</span>
                            <span class="p">[</span><span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">splitext</span><span class="p">(</span><span class="n">components</span><span class="p">[</span><span class="o">-</span><span class="mi">1</span><span class="p">])[</span><span class="mi">0</span><span class="p">]])</span>

        <span class="k">def</span> <span class="nf">exec_module</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">module</span><span class="p">):</span>
            <span class="k">assert</span> <span class="n">module</span><span class="o">.</span><span class="vm">__name__</span> <span class="o">==</span> <span class="bp">self</span><span class="o">.</span><span class="n">_module_name</span>
            <span class="n">code</span> <span class="o">=</span> <span class="kc">None</span>
            <span class="k">with</span> <span class="n">_proto_code_cache_lock</span><span class="p">:</span>
                <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">_module_name</span> <span class="ow">in</span> <span class="n">_proto_code_cache</span><span class="p">:</span>
                    <span class="n">code</span> <span class="o">=</span> <span class="n">_proto_code_cache</span><span class="p">[</span><span class="bp">self</span><span class="o">.</span><span class="n">_module_name</span><span class="p">]</span>
                    <span class="n">exec</span><span class="p">(</span><span class="n">code</span><span class="p">,</span> <span class="n">module</span><span class="o">.</span><span class="vm">__dict__</span><span class="p">)</span>
                <span class="k">else</span><span class="p">:</span>
                    <span class="n">files</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_codegen_fn</span><span class="p">(</span>
                        <span class="bp">self</span><span class="o">.</span><span class="n">_protobuf_path</span><span class="o">.</span><span class="n">encode</span><span class="p">(</span><span class="s1">&#39;ascii&#39;</span><span class="p">),</span>
                        <span class="p">[</span><span class="n">path</span><span class="o">.</span><span class="n">encode</span><span class="p">(</span><span class="s1">&#39;ascii&#39;</span><span class="p">)</span> <span class="k">for</span> <span class="n">path</span> <span class="ow">in</span> <span class="n">sys</span><span class="o">.</span><span class="n">path</span><span class="p">])</span>
                    <span class="c1"># NOTE: The files are returned in topological order of dependencies. Each</span>
                    <span class="c1"># entry is guaranteed to depend only on the modules preceding it in the</span>
                    <span class="c1"># list and the last entry is guaranteed to be our requested module. We</span>
                    <span class="c1"># cache the code from the first invocation at module-scope so that we</span>
                    <span class="c1"># don&#39;t have to regenerate code that has already been generated by protoc.</span>
                    <span class="k">for</span> <span class="n">f</span> <span class="ow">in</span> <span class="n">files</span><span class="p">[:</span><span class="o">-</span><span class="mi">1</span><span class="p">]:</span>
                        <span class="n">module_name</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_generated_file_to_module_name</span><span class="p">(</span>
                            <span class="n">f</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">decode</span><span class="p">(</span><span class="s1">&#39;ascii&#39;</span><span class="p">))</span>
                        <span class="k">if</span> <span class="n">module_name</span> <span class="ow">not</span> <span class="ow">in</span> <span class="n">sys</span><span class="o">.</span><span class="n">modules</span><span class="p">:</span>
                            <span class="k">if</span> <span class="n">module_name</span> <span class="ow">not</span> <span class="ow">in</span> <span class="n">_proto_code_cache</span><span class="p">:</span>
                                <span class="n">_proto_code_cache</span><span class="p">[</span><span class="n">module_name</span><span class="p">]</span> <span class="o">=</span> <span class="n">f</span><span class="p">[</span><span class="mi">1</span><span class="p">]</span>
                            <span class="n">importlib</span><span class="o">.</span><span class="n">import_module</span><span class="p">(</span><span class="n">module_name</span><span class="p">)</span>
                    <span class="n">exec</span><span class="p">(</span><span class="n">files</span><span class="p">[</span><span class="o">-</span><span class="mi">1</span><span class="p">][</span><span class="mi">1</span><span class="p">],</span> <span class="n">module</span><span class="o">.</span><span class="vm">__dict__</span><span class="p">)</span>

    <span class="k">class</span> <span class="nc">ProtoFinder</span><span class="p">(</span><span class="n">importlib</span><span class="o">.</span><span class="n">abc</span><span class="o">.</span><span class="n">MetaPathFinder</span><span class="p">):</span>

        <span class="k">def</span> <span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">suffix</span><span class="p">,</span> <span class="n">codegen_fn</span><span class="p">):</span>
            <span class="bp">self</span><span class="o">.</span><span class="n">_suffix</span> <span class="o">=</span> <span class="n">suffix</span>
            <span class="bp">self</span><span class="o">.</span><span class="n">_codegen_fn</span> <span class="o">=</span> <span class="n">codegen_fn</span>

        <span class="k">def</span> <span class="nf">find_spec</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">fullname</span><span class="p">,</span> <span class="n">path</span><span class="p">,</span> <span class="n">target</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
            <span class="k">if</span> <span class="ow">not</span> <span class="n">fullname</span><span class="o">.</span><span class="n">endswith</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_suffix</span><span class="p">):</span>
                <span class="k">return</span> <span class="kc">None</span>
            <span class="n">filepath</span> <span class="o">=</span> <span class="n">_module_name_to_proto_file</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_suffix</span><span class="p">,</span> <span class="n">fullname</span><span class="p">)</span>
            <span class="k">for</span> <span class="n">search_path</span> <span class="ow">in</span> <span class="n">sys</span><span class="o">.</span><span class="n">path</span><span class="p">:</span>
                <span class="k">try</span><span class="p">:</span>
                    <span class="n">prospective_path</span> <span class="o">=</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">search_path</span><span class="p">,</span> <span class="n">filepath</span><span class="p">)</span>
                    <span class="n">os</span><span class="o">.</span><span class="n">stat</span><span class="p">(</span><span class="n">prospective_path</span><span class="p">)</span>
                <span class="k">except</span> <span class="p">(</span><span class="ne">FileNotFoundError</span><span class="p">,</span> <span class="ne">NotADirectoryError</span><span class="p">,</span> <span class="ne">OSError</span><span class="p">):</span>
                    <span class="k">continue</span>
                <span class="k">else</span><span class="p">:</span>
                    <span class="k">return</span> <span class="n">importlib</span><span class="o">.</span><span class="n">machinery</span><span class="o">.</span><span class="n">ModuleSpec</span><span class="p">(</span>
                        <span class="n">fullname</span><span class="p">,</span>
                        <span class="n">ProtoLoader</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_suffix</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">_codegen_fn</span><span class="p">,</span> <span class="n">fullname</span><span class="p">,</span>
                                    <span class="n">filepath</span><span class="p">,</span> <span class="n">search_path</span><span class="p">))</span>

    <span class="c1"># NOTE(rbellevi): We provide an environment variable that enables users to completely</span>
    <span class="c1"># disable this behavior if it is not desired, e.g. for performance reasons.</span>
    <span class="k">if</span> <span class="ow">not</span> <span class="n">os</span><span class="o">.</span><span class="n">getenv</span><span class="p">(</span><span class="n">_DISABLE_DYNAMIC_STUBS</span><span class="p">):</span>
        <span class="n">_maybe_install_proto_finders</span><span class="p">()</span>

<span class="k">if</span> <span class="vm">__name__</span> <span class="o">==</span> <span class="s1">&#39;__main__&#39;</span><span class="p">:</span>
    <span class="n">proto_include</span> <span class="o">=</span> <span class="n">pkg_resources</span><span class="o">.</span><span class="n">resource_filename</span><span class="p">(</span><span class="s1">&#39;grpc_tools&#39;</span><span class="p">,</span> <span class="s1">&#39;_proto&#39;</span><span class="p">)</span>
    <span class="n">sys</span><span class="o">.</span><span class="n">exit</span><span class="p">(</span><span class="n">main</span><span class="p">(</span><span class="n">sys</span><span class="o">.</span><span class="n">argv</span> <span class="o">+</span> <span class="p">[</span><span class="s1">&#39;-I</span><span class="si">{}</span><span class="s1">&#39;</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">proto_include</span><span class="p">)]))</span>
</pre></div>

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