1 // Copyright 2020 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 #include <cstddef>
16 #include <cstdint>
17 #include <cstdio>
18
19 #include "pw_assert/check.h"
20 #include "pw_hdlc/rpc_channel.h"
21 #include "pw_hdlc/rpc_packets.h"
22 #include "pw_log/log.h"
23 #include "pw_rpc_system_server/rpc_server.h"
24 #include "pw_stream/socket_stream.h"
25
26 namespace pw::rpc::system_server {
27 namespace {
28
29 constexpr size_t kMaxTransmissionUnit = 512;
30 uint16_t socket_port = 33000;
31
32 stream::SocketStream socket_stream;
33
34 hdlc::RpcChannelOutput hdlc_channel_output(socket_stream,
35 hdlc::kDefaultRpcAddress,
36 "HDLC channel");
37 Channel channels[] = {rpc::Channel::Create<1>(&hdlc_channel_output)};
38 rpc::Server server(channels);
39
40 } // namespace
41
set_socket_port(uint16_t new_socket_port)42 void set_socket_port(uint16_t new_socket_port) {
43 socket_port = new_socket_port;
44 }
45
Init()46 void Init() {
47 log_basic::SetOutput([](std::string_view log) {
48 std::fprintf(stderr, "%.*s\n", static_cast<int>(log.size()), log.data());
49 hdlc::WriteUIFrame(1, std::as_bytes(std::span(log)), socket_stream)
50 .IgnoreError(); // TODO(pwbug/387): Handle Status properly
51 });
52
53 PW_LOG_INFO("Starting pw_rpc server on port %d", socket_port);
54 PW_CHECK_OK(socket_stream.Serve(socket_port));
55 }
56
Server()57 rpc::Server& Server() { return server; }
58
Start()59 Status Start() {
60 // Declare a buffer for decoding incoming HDLC frames.
61 std::array<std::byte, kMaxTransmissionUnit> input_buffer;
62 hdlc::Decoder decoder(input_buffer);
63
64 while (true) {
65 std::array<std::byte, kMaxTransmissionUnit> data;
66 auto ret_val = socket_stream.Read(data);
67 if (ret_val.ok()) {
68 for (std::byte byte : ret_val.value()) {
69 if (auto result = decoder.Process(byte); result.ok()) {
70 hdlc::Frame& frame = result.value();
71 if (frame.address() == hdlc::kDefaultRpcAddress) {
72 server.ProcessPacket(frame.data(), hdlc_channel_output)
73 .IgnoreError(); // TODO(pwbug/387): Handle Status properly
74 }
75 }
76 }
77 }
78 }
79 }
80
81 } // namespace pw::rpc::system_server
82