| /* |
| * Copyright (C) 2019 The Android Open Source Project |
| * |
| * 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 |
| * |
| * http://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. |
| */ |
| |
| #ifndef PROTO_PIPE_H |
| #define PROTO_PIPE_H |
| |
| #include <google/protobuf/message_lite.h> |
| #include "tools/base/deploy/common/event.h" |
| #include "tools/base/deploy/common/message_pipe_wrapper.h" |
| #include "tools/base/deploy/common/utils.h" |
| |
| namespace deploy { |
| |
| // A class that exposes methods to easily serialize and send proto messages, as |
| // well as wait for proto responses. |
| class ProtoPipe { |
| public: |
| ProtoPipe(int fd) : pipe_(fd) {} |
| |
| // Writes a serialized protobuf message to the pipe. |
| bool Write(const google::protobuf::MessageLite& message) { |
| std::string bytes; |
| if (!message.SerializeToString(&bytes)) { |
| ErrEvent("Protopipe: Unable to serialize protobuffer message"); |
| return false; |
| } |
| return pipe_.Write(bytes); |
| } |
| |
| // Waits up to timeout milliseconds for a message to be available from the |
| // pipe, then attempts to parse the data read into the specified proto. |
| bool Read(int timeout_ms, google::protobuf::MessageLite* message) { |
| std::string bytes; |
| if (!pipe_.Read(timeout_ms, &bytes)) { |
| ErrEvent("Protopipe: Unable to read() from pipe"); |
| return false; |
| } |
| |
| if (!message->ParseFromString(bytes)) { |
| ErrEvent("Unable to parse proto message"); |
| return false; |
| } |
| return true; |
| } |
| |
| void Close() { pipe_.Close(); } |
| |
| private: |
| MessagePipeWrapper pipe_; |
| }; |
| |
| // A derived class that owns the fd passed in the constructor and will therefore |
| // close it when it is destructed. |
| class OwnedProtoPipe : public ProtoPipe { |
| public: |
| OwnedProtoPipe(int fd) : ProtoPipe(fd) {} |
| virtual ~OwnedProtoPipe() { Close(); } |
| }; |
| |
| } // namespace deploy |
| |
| #endif |