| # Copyright 2021 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. |
| """This module generates the code for raw pw_rpc services.""" |
| |
| import os |
| from typing import Iterable |
| |
| from pw_protobuf.output_file import OutputFile |
| from pw_protobuf.proto_tree import ProtoServiceMethod |
| from pw_protobuf.proto_tree import build_node_tree |
| from pw_rpc import codegen |
| from pw_rpc.codegen import (client_call_type, get_id, CodeGenerator, |
| RPC_NAMESPACE) |
| |
| PROTO_H_EXTENSION = '.pb.h' |
| |
| |
| def _proto_filename_to_generated_header(proto_file: str) -> str: |
| """Returns the generated C++ RPC header name for a .proto file.""" |
| filename = os.path.splitext(proto_file)[0] |
| return f'{filename}.raw_rpc{PROTO_H_EXTENSION}' |
| |
| |
| def _proto_filename_to_stub_header(proto_file: str) -> str: |
| """Returns the generated C++ RPC header name for a .proto file.""" |
| filename = os.path.splitext(proto_file)[0] |
| return f'{filename}.raw_rpc.stub{PROTO_H_EXTENSION}' |
| |
| |
| def _function(method: ProtoServiceMethod) -> str: |
| return f'{client_call_type(method, "Raw")} {method.name()}' |
| |
| |
| def _user_args(method: ProtoServiceMethod) -> Iterable[str]: |
| if not method.client_streaming(): |
| yield '::pw::ConstByteSpan request' |
| |
| if method.server_streaming(): |
| yield '::pw::Function<void(::pw::ConstByteSpan)>&& on_next = nullptr' |
| yield '::pw::Function<void(::pw::Status)>&& on_completed = nullptr' |
| else: |
| yield ('::pw::Function<void(::pw::ConstByteSpan, ::pw::Status)>&& ' |
| 'on_completed = nullptr') |
| |
| yield '::pw::Function<void(::pw::Status)>&& on_error = nullptr' |
| |
| |
| class RawCodeGenerator(CodeGenerator): |
| """Generates an RPC service and client using the raw buffers API.""" |
| def name(self) -> str: |
| return 'raw' |
| |
| def method_union_name(self) -> str: |
| return 'RawMethodUnion' |
| |
| def includes(self, unused_proto_file_name: str) -> Iterable[str]: |
| yield '#include "pw_rpc/raw/client_reader_writer.h"' |
| yield '#include "pw_rpc/raw/internal/method_union.h"' |
| yield '#include "pw_rpc/raw/server_reader_writer.h"' |
| |
| def service_aliases(self) -> None: |
| self.line(f'using RawServerWriter = {RPC_NAMESPACE}::RawServerWriter;') |
| self.line(f'using RawServerReader = {RPC_NAMESPACE}::RawServerReader;') |
| self.line('using RawServerReaderWriter = ' |
| f'{RPC_NAMESPACE}::RawServerReaderWriter;') |
| |
| def method_descriptor(self, method: ProtoServiceMethod) -> None: |
| impl_method = f'&Implementation::{method.name()}' |
| |
| self.line(f'{RPC_NAMESPACE}::internal::GetRawMethodFor<{impl_method}, ' |
| f'{method.type().cc_enum()}>(') |
| self.line(f' {get_id(method)}), // Hash of "{method.name()}"') |
| |
| def client_member_function(self, method: ProtoServiceMethod) -> None: |
| self.line(f'{_function(method)}(') |
| self.indented_list(*_user_args(method), end=') const {') |
| |
| with self.indent(): |
| base = 'Stream' if method.server_streaming() else 'Unary' |
| self.line(f'return {RPC_NAMESPACE}::internal::' |
| f'{base}ResponseClientCall::' |
| f'Start<{client_call_type(method, "Raw")}>(') |
| |
| service_client = RPC_NAMESPACE + '::internal::ServiceClient' |
| arg = ['std::move(on_next)'] if method.server_streaming() else [] |
| |
| self.indented_list( |
| f'{service_client}::client()', |
| f'{service_client}::channel_id()', |
| 'kServiceId', |
| get_id(method), |
| *arg, |
| 'std::move(on_completed)', |
| 'std::move(on_error)', |
| '{}' if method.client_streaming() else 'request', |
| end=');') |
| |
| self.line('}') |
| |
| def client_static_function(self, method: ProtoServiceMethod) -> None: |
| self.line(f'static {_function(method)}(') |
| self.indented_list(f'{RPC_NAMESPACE}::Client& client', |
| 'uint32_t channel_id', |
| *_user_args(method), |
| end=') {') |
| |
| with self.indent(): |
| self.line(f'return Client(client, channel_id).{method.name()}(') |
| |
| args = [] |
| |
| if not method.client_streaming(): |
| args.append('request') |
| |
| if method.server_streaming(): |
| args.append('std::move(on_next)') |
| |
| self.indented_list(*args, |
| 'std::move(on_completed)', |
| 'std::move(on_error)', |
| end=');') |
| |
| self.line('}') |
| |
| def method_info_specialization(self, method: ProtoServiceMethod) -> None: |
| self.line() |
| # We have Request/Response as voids to mark raw as a special case. |
| # Raw operates in ConstByteSpans, which won't be copied by copying the |
| # span itself and without special treatment will lead to dangling |
| # pointers. |
| # |
| # Helpers/traits that want to use Request/Response and should support |
| # raw are required to do a special implementation for them instead that |
| # will copy the actual data. |
| self.line('using Request = void;') |
| self.line('using Response = void;') |
| |
| |
| class StubGenerator(codegen.StubGenerator): |
| def unary_signature(self, method: ProtoServiceMethod, prefix: str) -> str: |
| return (f'void {prefix}{method.name()}(pw::ConstByteSpan request, ' |
| 'pw::rpc::RawUnaryResponder& responder)') |
| |
| def unary_stub(self, method: ProtoServiceMethod, |
| output: OutputFile) -> None: |
| output.write_line(codegen.STUB_REQUEST_TODO) |
| output.write_line('static_cast<void>(request);') |
| output.write_line(codegen.STUB_RESPONSE_TODO) |
| output.write_line('static_cast<void>(responder);') |
| |
| def server_streaming_signature(self, method: ProtoServiceMethod, |
| prefix: str) -> str: |
| |
| return (f'void {prefix}{method.name()}(' |
| 'pw::ConstByteSpan request, RawServerWriter& writer)') |
| |
| def client_streaming_signature(self, method: ProtoServiceMethod, |
| prefix: str) -> str: |
| return f'void {prefix}{method.name()}(RawServerReader& reader)' |
| |
| def bidirectional_streaming_signature(self, method: ProtoServiceMethod, |
| prefix: str) -> str: |
| return (f'void {prefix}{method.name()}(' |
| 'RawServerReaderWriter& reader_writer)') |
| |
| |
| def process_proto_file(proto_file) -> Iterable[OutputFile]: |
| """Generates code for a single .proto file.""" |
| |
| _, package_root = build_node_tree(proto_file) |
| output_filename = _proto_filename_to_generated_header(proto_file.name) |
| |
| generator = RawCodeGenerator(output_filename) |
| codegen.generate_package(proto_file, package_root, generator) |
| |
| codegen.package_stubs(package_root, generator, StubGenerator()) |
| |
| return [generator.output] |