Remove dependency on grpcio-tools

mypy-protobuf doesn't require it to run. It's only required to
run mypy on the generated stubs. This removes a dependency, especially
nice for folks not actually using grpc.

Fixes #270

Author: nipunn1313

CHANGELOG.md

@@ -1,6 +1,7 @@
 ## Upcoming
 
 - Switch from setup.py to pyproject.toml and setup.cfg per https://packaging.python.org/tutorials/packaging-projects/
+- Remove dependency on grpcio-tools. mypy-protobuf doesn't need it to run. It's only needed to run mypy afterward.
 
 ## 2.9
 

run_test.sh

@@ -9,6 +9,9 @@ PY_VER_MYPY_PROTOBUF_SHORT=$(echo $PY_VER_MYPY_PROTOBUF | cut -d. -f1-2)
 PY_VER_MYPY=${PY_VER_MYPY:=3.8.11}
 PY_VER_UNIT_TESTS="${PY_VER_UNIT_TESTS_3:=3.8.11} ${PY_VER_UNIT_TESTS_2:=2.7.18}"
 
+PROTOC_ARGS="--proto_path=proto/ --experimental_allow_proto3_optional"
+GRPC_PROTOS=$(find proto/testproto/grpc -name "*.proto")
+
 # Clean out generated/ directory - except for .generated / __init__.py
 find test/generated -type f -not \( -name "*.expected" -or -name "__init__.py" \) -delete
 
@@ -86,7 +89,6 @@ MYPY_PROTOBUF_VENV=venv_$PY_VER_MYPY_PROTOBUF
         exit 1
     fi
 
-    PROTOC_ARGS="--proto_path=proto/ --experimental_allow_proto3_optional"
     # Compile protoc -> python
     $PROTOC $PROTOC_ARGS --python_out=test/generated `find proto -name "*.proto"`
 
@@ -102,16 +104,23 @@ MYPY_PROTOBUF_VENV=venv_$PY_VER_MYPY_PROTOBUF
     # Overwrite w/ run with mypy-protobuf without flags
     $PROTOC $PROTOC_ARGS --mypy_out=test/generated `find proto -name "*.proto"`
 
-    # Compile GRPC
-    GRPC_PROTOS=$(find proto/testproto/grpc -name "*.proto")
+    # Generate grpc protos
     $PROTOC $PROTOC_ARGS --mypy_grpc_out=test/generated $GRPC_PROTOS
-    python -m grpc_tools.protoc $PROTOC_ARGS --grpc_python_out=test/generated $GRPC_PROTOS
 )
 
 for PY_VER in $PY_VER_UNIT_TESTS; do
     UNIT_TESTS_VENV=venv_$PY_VER
     PY_VER_MYPY_TARGET=$(echo $PY_VER | cut -d. -f1-2)
 
+    # Generate GRPC protos for mypy / tests
+    if [[ $PY_VER =~ ^3.* ]]; then
+        (
+            source $UNIT_TESTS_VENV/bin/activate
+            $PROTOC $PROTOC_ARGS --mypy_grpc_out=test/generated $GRPC_PROTOS
+            python -m grpc_tools.protoc $PROTOC_ARGS --grpc_python_out=test/generated $GRPC_PROTOS
+        )
+    fi
+
     # Run mypy on unit tests / generated output
     (
         source $MYPY_VENV/bin/activate

setup.cfg

@@ -17,7 +17,6 @@ py_modules =
 install_requires =
     protobuf>=3.17.3
     types-protobuf>=3.17.3
-    grpcio-tools>=1.38.1
 python_requires = >=3.6
 
 [options.entry_points]

test_requirements.txt

@@ -1,8 +1,9 @@
 # Requirements to run unit tests. Tests import from
 # generated code.
+protobuf>=3.17.3
 pytest ; python_version < "3.0"
 pytest==6.2.4 ; python_version >= "3.0"
-protobuf>=3.17.3
-typing ; python_version<"3.5"
 grpc-stubs>=1.24.6 ; python_version>="3.0"
+grpcio-tools>=1.38.1 ; python_version >= "3.5"
 types-protobuf==3.17.3
+typing ; python_version<"3.5"