98 lines
3.4 KiB
C++
98 lines
3.4 KiB
C++
// Copyright 2020 The Pigweed Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License"); you may not
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// use this file except in compliance with the License. You may obtain a copy of
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// the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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// License for the specific language governing permissions and limitations under
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// the License.
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// clang-format off
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#include "pw_rpc/internal/log_config.h" // PW_LOG_* macros must be first.
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#include "pw_rpc/client.h"
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// clang-format on
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#include "pw_log/log.h"
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#include "pw_rpc/internal/client_call.h"
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#include "pw_rpc/internal/packet.h"
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#include "pw_status/try.h"
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namespace pw::rpc {
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namespace {
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using internal::Packet;
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using internal::PacketType;
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} // namespace
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Status Client::ProcessPacket(ConstByteSpan data) {
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PW_TRY_ASSIGN(Packet packet, Endpoint::ProcessPacket(data, Packet::kClient));
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// Find an existing call for this RPC, if any.
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internal::rpc_lock().lock();
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internal::ClientCall* call =
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static_cast<internal::ClientCall*>(FindCall(packet));
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internal::Channel* channel = GetInternalChannel(packet.channel_id());
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if (channel == nullptr) {
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internal::rpc_lock().unlock();
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PW_LOG_WARN("RPC client received a packet for an unregistered channel");
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return Status::Unavailable();
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}
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if (call == nullptr || call->id() != packet.call_id()) {
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// The call for the packet does not exist. If the packet is a server stream
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// message, notify the server so that it can kill the stream. Otherwise,
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// silently drop the packet (as it would terminate the RPC anyway).
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if (packet.type() == PacketType::SERVER_STREAM) {
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channel->Send(Packet::ClientError(packet, Status::FailedPrecondition()))
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.IgnoreError();
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PW_LOG_WARN("RPC client received stream message for an unknown call");
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}
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internal::rpc_lock().unlock();
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return OkStatus(); // OK since the packet was handled
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}
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switch (packet.type()) {
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case PacketType::RESPONSE:
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// RPCs without a server stream include a payload with the final packet.
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if (call->has_server_stream()) {
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static_cast<internal::StreamResponseClientCall&>(*call).HandleCompleted(
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packet.status());
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} else {
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static_cast<internal::UnaryResponseClientCall&>(*call).HandleCompleted(
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packet.payload(), packet.status());
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}
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break;
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case PacketType::SERVER_ERROR:
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call->HandleError(packet.status());
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break;
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case PacketType::SERVER_STREAM:
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if (call->has_server_stream()) {
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call->HandlePayload(packet.payload());
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} else {
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// Report the error to the server so it can abort the RPC.
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channel->Send(Packet::ClientError(packet, Status::InvalidArgument()))
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.IgnoreError(); // Errors are logged in Channel::Send.
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call->HandleError(Status::InvalidArgument());
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PW_LOG_DEBUG("Received SERVER_STREAM for RPC without a server stream");
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}
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break;
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default:
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internal::rpc_lock().unlock();
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PW_LOG_WARN("pw_rpc client unable to handle packet of type %u",
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static_cast<unsigned>(packet.type()));
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}
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return OkStatus(); // OK since the packet was handled
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}
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} // namespace pw::rpc
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