Wyatt Hepler | 2253040 | 2021-07-30 23:40:40 -0700 | [diff] [blame] | 1 | // Copyright 2021 The Pigweed Authors |
| 2 | // |
| 3 | // Licensed under the Apache License, Version 2.0 (the "License"); you may not |
| 4 | // use this file except in compliance with the License. You may obtain a copy of |
| 5 | // the License at |
| 6 | // |
| 7 | // https://www.apache.org/licenses/LICENSE-2.0 |
| 8 | // |
| 9 | // Unless required by applicable law or agreed to in writing, software |
| 10 | // distributed under the License is distributed on an "AS IS" BASIS, WITHOUT |
| 11 | // WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the |
| 12 | // License for the specific language governing permissions and limitations under |
| 13 | // the License. |
| 14 | |
| 15 | // Simple RPC server with the transfer service registered. Reads HDLC frames |
| 16 | // with RPC packets through a socket. The transfer service reads and writes to a |
| 17 | // fixed-size buffer. The buffer's contents can be set by writing |
| 18 | // null-terminated strings through stdin. |
| 19 | |
| 20 | #include <cstddef> |
| 21 | #include <thread> |
| 22 | #include <variant> |
| 23 | |
| 24 | #include "pw_assert/check.h" |
| 25 | #include "pw_log/log.h" |
| 26 | #include "pw_rpc_system_server/rpc_server.h" |
| 27 | #include "pw_rpc_system_server/socket.h" |
| 28 | #include "pw_stream/memory_stream.h" |
| 29 | #include "pw_transfer/transfer.h" |
| 30 | |
| 31 | namespace pw::transfer { |
| 32 | namespace { |
| 33 | |
| 34 | class BufferReaderWriter final : public ReadWriteHandler { |
| 35 | public: |
| 36 | BufferReaderWriter(uint32_t transfer_id, ByteSpan buffer) |
| 37 | : ReadWriteHandler(transfer_id), buffer_(buffer), size_bytes_(0) {} |
| 38 | |
| 39 | Status PrepareRead() override { |
| 40 | set_reader( |
| 41 | stream_.emplace<stream::MemoryReader>(buffer_.first(size_bytes_))); |
| 42 | return OkStatus(); |
| 43 | } |
| 44 | |
| 45 | Status PrepareWrite() override { |
| 46 | set_writer(stream_.emplace<stream::MemoryWriter>(buffer_)); |
| 47 | return OkStatus(); |
| 48 | } |
| 49 | |
| 50 | Status FinalizeWrite(Status) override { |
| 51 | size_bytes_ = std::get<stream::MemoryWriter>(stream_).bytes_written(); |
| 52 | return OkStatus(); |
| 53 | } |
| 54 | |
| 55 | void set_size(size_t new_size) { size_bytes_ = new_size; } |
| 56 | |
| 57 | private: |
| 58 | // TODO(hepler): Use a seekable MemoryReaderWriter when available. |
| 59 | std::variant<std::monostate, stream::MemoryReader, stream::MemoryWriter> |
| 60 | stream_; |
| 61 | ByteSpan buffer_; |
| 62 | size_t size_bytes_; |
| 63 | }; |
| 64 | |
Alexei Frolov | 563946f | 2021-08-05 18:58:48 -0700 | [diff] [blame] | 65 | constexpr size_t kChunkSizeBytes = 256; |
| 66 | constexpr size_t kMaxReceiveSizeBytes = 1024; |
| 67 | |
| 68 | TransferService transfer_service(kChunkSizeBytes, kMaxReceiveSizeBytes); |
Wyatt Hepler | 2253040 | 2021-07-30 23:40:40 -0700 | [diff] [blame] | 69 | |
| 70 | std::byte buffer[512]; |
| 71 | |
Wyatt Hepler | 82d499b | 2021-08-23 09:13:16 -0700 | [diff] [blame^] | 72 | void RunServer(int socket_port) { |
| 73 | rpc::system_server::set_socket_port(socket_port); |
Wyatt Hepler | 2253040 | 2021-07-30 23:40:40 -0700 | [diff] [blame] | 74 | |
| 75 | BufferReaderWriter transfer(99, buffer); |
| 76 | |
| 77 | // Read characters from stdin directly into the buffer. Stop at 0 or overflow. |
| 78 | std::thread([&transfer] { |
| 79 | int next_char; |
| 80 | size_t index = 0; |
| 81 | |
| 82 | while ((next_char = std::getchar()) != EOF) { |
| 83 | if (next_char == '\0') { |
| 84 | transfer.set_size(index); |
| 85 | index = 0; |
| 86 | continue; |
| 87 | } |
| 88 | |
| 89 | PW_CHECK_UINT_LT(index, sizeof(buffer), "Sent too many characters!"); |
| 90 | buffer[index++] = static_cast<std::byte>(next_char); |
| 91 | } |
| 92 | }).detach(); |
| 93 | |
| 94 | transfer_service.RegisterHandler(transfer); |
| 95 | |
| 96 | rpc::system_server::Init(); |
| 97 | rpc::system_server::Server().RegisterService(transfer_service); |
| 98 | |
| 99 | PW_LOG_INFO("Starting pw_rpc server"); |
Wyatt Hepler | 82d499b | 2021-08-23 09:13:16 -0700 | [diff] [blame^] | 100 | PW_CHECK_OK(rpc::system_server::Start()); |
Wyatt Hepler | 2253040 | 2021-07-30 23:40:40 -0700 | [diff] [blame] | 101 | } |
| 102 | |
| 103 | } // namespace |
| 104 | } // namespace pw::transfer |
| 105 | |
Wyatt Hepler | 82d499b | 2021-08-23 09:13:16 -0700 | [diff] [blame^] | 106 | int main(int argc, char* argv[]) { |
| 107 | if (argc != 2) { |
| 108 | PW_LOG_ERROR("Usage: %s PORT", argv[0]); |
| 109 | return 1; |
| 110 | } |
| 111 | pw::transfer::RunServer(std::atoi(argv[1])); |
Wyatt Hepler | 2253040 | 2021-07-30 23:40:40 -0700 | [diff] [blame] | 112 | return 0; |
| 113 | } |