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# Copyright 2020 The Pigweed Authors
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may not
# use this file except in compliance with the License. You may obtain a copy of
# the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations under
# the License.
"""pw_rpc protoc plugin entrypoint to generate code for RPC services."""
import enum
import sys
from google.protobuf.compiler import plugin_pb2
from pw_rpc import codegen_nanopb
from pw_rpc import codegen_pwpb
from pw_rpc import codegen_raw
class Codegen(enum.Enum):
RAW = 0
NANOPB = 1
PWPB = 2
def process_proto_request(
codegen: Codegen,
req: plugin_pb2.CodeGeneratorRequest,
res: plugin_pb2.CodeGeneratorResponse,
) -> None:
"""Handles a protoc CodeGeneratorRequest message.
Generates code for the files in the request and writes the output to the
specified CodeGeneratorResponse message.
Args:
req: A CodeGeneratorRequest for a proto compilation.
res: A CodeGeneratorResponse to populate with the plugin's output.
"""
for proto_file in req.proto_file:
if codegen is Codegen.RAW:
output_files = codegen_raw.process_proto_file(proto_file)
elif codegen is Codegen.NANOPB:
output_files = codegen_nanopb.process_proto_file(proto_file)
elif codegen is Codegen.PWPB:
output_files = codegen_pwpb.process_proto_file(proto_file)
else:
raise NotImplementedError(f'Unknown codegen type {codegen}')
for output_file in output_files:
fd = res.file.add()
fd.name = output_file.name()
fd.content = output_file.content()
def main(codegen: Codegen) -> int:
"""Protobuf compiler plugin entrypoint.
Reads a CodeGeneratorRequest proto from stdin and writes a
CodeGeneratorResponse to stdout.
"""
data = sys.stdin.buffer.read()
request = plugin_pb2.CodeGeneratorRequest.FromString(data)
response = plugin_pb2.CodeGeneratorResponse()
process_proto_request(codegen, request, response)
# Declare that this plugin supports optional fields in proto3. No proto
# message code is generated, so optional in proto3 is supported trivially.
response.supported_features |= ( # type: ignore[attr-defined]
response.FEATURE_PROTO3_OPTIONAL
) # type: ignore[attr-defined]
sys.stdout.buffer.write(response.SerializeToString())
return 0
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