| // 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. |
| |
| // Simple RPC server with the transfer service registered. Reads HDLC frames |
| // with RPC packets through a socket. The transfer service reads and writes to a |
| // fixed-size buffer. The buffer's contents can be set by writing |
| // null-terminated strings through stdin. |
| |
| #include <cstddef> |
| #include <thread> |
| #include <variant> |
| |
| #include "pw_assert/check.h" |
| #include "pw_log/log.h" |
| #include "pw_rpc_system_server/rpc_server.h" |
| #include "pw_rpc_system_server/socket.h" |
| #include "pw_stream/memory_stream.h" |
| #include "pw_transfer/transfer.h" |
| |
| namespace pw::transfer { |
| namespace { |
| |
| class BufferReaderWriter final : public ReadWriteHandler { |
| public: |
| BufferReaderWriter(uint32_t transfer_id, ByteSpan buffer) |
| : ReadWriteHandler(transfer_id), buffer_(buffer), size_bytes_(0) {} |
| |
| Status PrepareRead() override { |
| set_reader( |
| stream_.emplace<stream::MemoryReader>(buffer_.first(size_bytes_))); |
| return OkStatus(); |
| } |
| |
| Status PrepareWrite() override { |
| set_writer(stream_.emplace<stream::MemoryWriter>(buffer_)); |
| return OkStatus(); |
| } |
| |
| Status FinalizeWrite(Status) override { |
| size_bytes_ = std::get<stream::MemoryWriter>(stream_).bytes_written(); |
| return OkStatus(); |
| } |
| |
| void set_size(size_t new_size) { size_bytes_ = new_size; } |
| |
| private: |
| // TODO(hepler): Use a seekable MemoryReaderWriter when available. |
| std::variant<std::monostate, stream::MemoryReader, stream::MemoryWriter> |
| stream_; |
| ByteSpan buffer_; |
| size_t size_bytes_; |
| }; |
| |
| TransferService transfer_service; |
| |
| std::byte buffer[512]; |
| |
| void RunServer() { |
| rpc::system_server::set_socket_port(33001); |
| |
| BufferReaderWriter transfer(99, buffer); |
| |
| // Read characters from stdin directly into the buffer. Stop at 0 or overflow. |
| std::thread([&transfer] { |
| int next_char; |
| size_t index = 0; |
| |
| while ((next_char = std::getchar()) != EOF) { |
| if (next_char == '\0') { |
| transfer.set_size(index); |
| index = 0; |
| continue; |
| } |
| |
| PW_CHECK_UINT_LT(index, sizeof(buffer), "Sent too many characters!"); |
| buffer[index++] = static_cast<std::byte>(next_char); |
| } |
| }).detach(); |
| |
| transfer_service.RegisterHandler(transfer); |
| |
| rpc::system_server::Init(); |
| rpc::system_server::Server().RegisterService(transfer_service); |
| |
| PW_LOG_INFO("Starting pw_rpc server"); |
| rpc::system_server::Start() |
| .IgnoreError(); // TODO(pwbug/387): Handle Status properly |
| } |
| |
| } // namespace |
| } // namespace pw::transfer |
| |
| int main() { |
| pw::transfer::RunServer(); |
| return 0; |
| } |