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<h1 id="python-grpc-protobufs">Python gRPC + protobufs</h1>
<h2 id="problem">Problem</h2>
<p>You have <code>.proto</code> files defining protobufs and grpc services and you want Pants to generate Python code from them that you can use from a Python application.</p>
<h2 id="solution">Solution</h2>
<p>Create <code>python_grpc_library</code> targets and use the gen goal to generate code from the <code>.proto</code> files. There is a codegen task grpcio-run, that uses Python's grpcio library https://grpc.io/ and generates python code from .proto files.</p>
<h2 id="usage">Usage</h2>
<p>in a <code>BUILD</code> file near your proto files, create a <code>python_grpcio_library</code> target with your protos as a <code>sources</code>.</p>
<div class="codehilite"><pre><span></span>python_grpcio_library(
sources=['service.proto'],
dependencies=[
'3rdparty/python:protobuf',
]
)
</pre></div>
<p>Then, you can add a dependency on this target in your python binary's <code>BUILD</code> file <code>dependencies</code> section:</p>
<div class="codehilite"><pre><span></span>python_binary(
source='server.py',
dependencies=[
'src/protobuf/org/pantsbuild/example/grpcio/service',
],
)
</pre></div>
<h2 id="example">Example:</h2>
<p>An example Python gRPC client/server can be found in <a href="https://github.com/pantsbuild/pants/tree/master/examples/src/python/example/grpcio">/examples/src/python/example/grpcio</a></p>
<p>to create a gRPC server execute</p>
<div class="codehilite"><pre><span></span>./pants run src/python/example/grpcio/server
</pre></div>
<p>and when server is running, run client example:</p>
<div class="codehilite"><pre><span></span>./pants run src/python/example/grpcio/client
</pre></div>
<p>generated code can be found as usual in pants output directory:</p>
<div class="codehilite"><pre><span></span>./pants.d/gen/grpcio-run/current/examples.src.protobuf.org.pantsbuild.example.service.service/current/org/pantsbuild/example/service
</pre></div>
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