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