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Original file line number | Diff line number | Diff line change |
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/* | ||
* | ||
* Copyright (c) 2021 Project CHIP Authors | ||
* All rights reserved. | ||
* | ||
* 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. | ||
* | ||
* This file is a fork from: third_party/pigweed/repo/targets/host/system_rpc_server.cc | ||
* But changes the disconnect behaviour from closing and returning, to awaiting a | ||
* reconnection. | ||
*/ | ||
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#include <cstddef> | ||
#include <cstdint> | ||
#include <cstdio> | ||
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#include "pw_assert/check.h" | ||
#include "pw_hdlc/rpc_channel.h" | ||
#include "pw_hdlc/rpc_packets.h" | ||
#include "pw_log/log.h" | ||
#include "pw_rpc_system_server/rpc_server.h" | ||
#include "pw_stream/socket_stream.h" | ||
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namespace pw::rpc::system_server { | ||
namespace { | ||
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constexpr size_t kMaxTransmissionUnit = 512; | ||
uint16_t socket_port = 33000; | ||
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stream::SocketStream socket_stream; | ||
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hdlc::RpcChannelOutput hdlc_channel_output(socket_stream, hdlc::kDefaultRpcAddress, "HDLC channel"); | ||
Channel channels[] = { rpc::Channel::Create<1>(&hdlc_channel_output) }; | ||
rpc::Server server(channels); | ||
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} // namespace | ||
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void set_socket_port(uint16_t new_socket_port) | ||
{ | ||
socket_port = new_socket_port; | ||
} | ||
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int GetServerSocketFd() | ||
{ | ||
return socket_stream.connection_fd(); | ||
} | ||
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void Init() | ||
{ | ||
log_basic::SetOutput([](std::string_view log) { | ||
std::fprintf(stderr, "%.*s\n", static_cast<int>(log.size()), log.data()); | ||
hdlc::WriteUIFrame(1, as_bytes(span(log)), socket_stream).IgnoreError(); // TODO(pwbug/387): Handle Status properly | ||
}); | ||
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PW_LOG_INFO("Starting pw_rpc server on port %d", socket_port); | ||
PW_CHECK_OK(socket_stream.Serve(socket_port)); | ||
} | ||
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rpc::Server & Server() | ||
{ | ||
return server; | ||
} | ||
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Status Start() | ||
{ | ||
// Declare a buffer for decoding incoming HDLC frames. | ||
std::array<std::byte, kMaxTransmissionUnit> input_buffer; | ||
hdlc::Decoder decoder(input_buffer); | ||
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while (true) | ||
{ | ||
std::array<std::byte, kMaxTransmissionUnit> data; | ||
auto ret_val = socket_stream.Read(data); | ||
if (!ret_val.ok()) | ||
{ | ||
if (ret_val.status() == Status::OutOfRange()) | ||
{ | ||
// An out of range status indicates the remote end has disconnected. | ||
// Start to serve the connection again, which will allow another | ||
// remote to connect. | ||
PW_CHECK_OK(socket_stream.Serve(socket_port)); | ||
} | ||
continue; | ||
} | ||
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for (std::byte byte : ret_val.value()) | ||
{ | ||
auto result = decoder.Process(byte); | ||
if (!result.ok()) | ||
{ | ||
// Non-OK means there isn't a complete packet yet, or there was some | ||
// other issue. Wait for more bytes that form a complete packet. | ||
continue; | ||
} | ||
hdlc::Frame & frame = result.value(); | ||
if (frame.address() != hdlc::kDefaultRpcAddress) | ||
{ | ||
// Wrong address; ignore the packet for now. In the future, this branch | ||
// could expand to add packet routing or metrics. | ||
continue; | ||
} | ||
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server.ProcessPacket(frame.data(), hdlc_channel_output).IgnoreError(); | ||
} | ||
} | ||
} | ||
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} // namespace pw::rpc::system_server |
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