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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.
// clang-format off
#include "pw_rpc/internal/log_config.h" // PW_LOG_* macros must be first.
#include "pw_rpc/client.h"
// clang-format on
#include "pw_log/log.h"
#include "pw_rpc/internal/client_call.h"
#include "pw_rpc/internal/packet.h"
#include "pw_status/try.h"
namespace pw::rpc {
namespace {
using internal::Packet;
using internal::pwpb::PacketType;
} // namespace
Status Client::ProcessPacket(ConstByteSpan data) {
PW_TRY_ASSIGN(Packet packet, Endpoint::ProcessPacket(data, Packet::kClient));
// Find an existing call for this RPC, if any.
internal::rpc_lock().lock();
IntrusiveList<internal::Call>::iterator call = FindCall(packet);
internal::Channel* channel = GetInternalChannel(packet.channel_id());
if (channel == nullptr) {
internal::rpc_lock().unlock();
PW_LOG_WARN("RPC client received a packet for an unregistered channel");
return Status::Unavailable();
}
if (call == calls_end()) {
// The call for the packet does not exist. If the packet is a server stream
// message, notify the server so that it can kill the stream. Otherwise,
// silently drop the packet (as it would terminate the RPC anyway).
if (packet.type() == PacketType::SERVER_STREAM) {
channel->Send(Packet::ClientError(packet, Status::FailedPrecondition()))
.IgnoreError();
PW_LOG_WARN("RPC client received stream message for an unknown call");
}
internal::rpc_lock().unlock();
return OkStatus(); // OK since the packet was handled
}
switch (packet.type()) {
case PacketType::RESPONSE:
// RPCs without a server stream include a payload with the final packet.
if (call->has_server_stream()) {
static_cast<internal::StreamResponseClientCall&>(*call).HandleCompleted(
packet.status());
} else {
static_cast<internal::UnaryResponseClientCall&>(*call).HandleCompleted(
packet.payload(), packet.status());
}
break;
case PacketType::SERVER_ERROR:
call->HandleError(packet.status());
break;
case PacketType::SERVER_STREAM:
if (call->has_server_stream()) {
call->HandlePayload(packet.payload());
} else {
// Report the error to the server so it can abort the RPC.
channel->Send(Packet::ClientError(packet, Status::InvalidArgument()))
.IgnoreError(); // Errors are logged in Channel::Send.
call->HandleError(Status::InvalidArgument());
PW_LOG_DEBUG("Received SERVER_STREAM for RPC without a server stream");
}
break;
case PacketType::REQUEST:
case PacketType::CLIENT_STREAM:
case PacketType::CLIENT_ERROR:
case PacketType::CLIENT_STREAM_END:
default:
internal::rpc_lock().unlock();
PW_LOG_WARN("pw_rpc client unable to handle packet of type %u",
static_cast<unsigned>(packet.type()));
}
return OkStatus(); // OK since the packet was handled
}
} // namespace pw::rpc
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