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// Copyright 2020 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.
#include "pw_rpc/client.h"
#include "pw_log/log.h"
#include "pw_rpc/internal/packet.h"
namespace pw::rpc {
namespace {
using internal::BaseClientCall;
using internal::Packet;
using internal::PacketType;
} // namespace
Status Client::ProcessPacket(ConstByteSpan data) {
Result<Packet> result = Packet::FromBuffer(data);
if (!result.ok()) {
PW_LOG_WARN("RPC client failed to decode incoming packet");
return Status::DataLoss();
}
Packet& packet = result.value();
if (packet.destination() != Packet::kClient) {
return Status::InvalidArgument();
}
if (packet.channel_id() == Channel::kUnassignedChannelId ||
packet.service_id() == 0 || packet.method_id() == 0) {
PW_LOG_WARN("RPC client received a malformed packet");
return Status::DataLoss();
}
auto call = std::find_if(calls_.begin(), calls_.end(), [&](auto& c) {
return c.channel().id() == packet.channel_id() &&
c.service_id() == packet.service_id() &&
c.method_id() == packet.method_id();
});
auto channel = std::find_if(channels_.begin(), channels_.end(), [&](auto& c) {
return c.id() == packet.channel_id();
});
if (channel == channels_.end()) {
PW_LOG_WARN("RPC client received a packet for an unregistered channel");
return Status::NotFound();
}
if (call == calls_.end()) {
PW_LOG_WARN("RPC client received a packet for a request it did not make");
channel->Send(Packet::ClientError(packet, Status::FailedPrecondition()));
return Status::NotFound();
}
switch (packet.type()) {
case PacketType::RESPONSE:
case PacketType::SERVER_ERROR:
call->HandleResponse(packet);
break;
case PacketType::SERVER_STREAM_END:
call->HandleResponse(packet);
RemoveCall(*call);
break;
default:
return Status::Unimplemented();
}
return Status::Ok();
}
Status Client::RegisterCall(BaseClientCall& call) {
auto existing_call = std::find_if(calls_.begin(), calls_.end(), [&](auto& c) {
return c.channel().id() == call.channel().id() &&
c.service_id() == call.service_id() &&
c.method_id() == call.method_id();
});
if (existing_call != calls_.end()) {
PW_LOG_WARN(
"RPC client tried to call same method multiple times; aborting.");
return Status::FailedPrecondition();
}
calls_.push_front(call);
return Status::Ok();
}
} // namespace pw::rpc
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