| // 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/internal/channel.h" |
| // clang-format on |
| |
| #include "pw_log/log.h" |
| #include "pw_rpc/internal/packet.h" |
| |
| namespace pw::rpc::internal { |
| |
| using std::byte; |
| |
| std::span<byte> Channel::OutputBuffer::payload(const Packet& packet) const { |
| const size_t reserved_size = packet.MinEncodedSizeBytes(); |
| return reserved_size <= buffer_.size() ? buffer_.subspan(reserved_size) |
| : std::span<byte>(); |
| } |
| |
| Status Channel::Send(OutputBuffer& buffer, const internal::Packet& packet) { |
| Result encoded = packet.Encode(buffer.buffer_); |
| |
| if (!encoded.ok()) { |
| PW_LOG_ERROR( |
| "Failed to encode RPC packet type %u to channel %u buffer, status %u", |
| static_cast<unsigned>(packet.type()), |
| static_cast<unsigned>(id()), |
| encoded.status().code()); |
| output().DiscardBuffer(buffer.buffer_); |
| buffer.buffer_ = {}; |
| return Status::Internal(); |
| } |
| |
| buffer.buffer_ = {}; |
| Status status = output().SendAndReleaseBuffer(encoded.value()); |
| |
| if (!status.ok()) { |
| PW_LOG_DEBUG("Channel %u failed to send packet with status %u", |
| static_cast<unsigned>(id()), |
| status.code()); |
| |
| // TODO(pwbug/503): It is important that pw_rpc provide a consistent set of |
| // status codes in its APIs. This status comes from a user class and |
| // should not be returned directly unless it maps to a standardized |
| // code. For now, just remap FAILED_PRECONDITION because that value is |
| // used within the RPC system for another purpose (attempted to use a |
| // closed RPC call object). Long term, the statuses need to be |
| // standardized across all APIs. For example, this might return OK, |
| // UNAVAILABLE, or DATA_LOSS and other codes are mapped to UNKNOWN. |
| if (status.IsFailedPrecondition()) { |
| status = Status::Unknown(); |
| } |
| } |
| return status; |
| } |
| |
| } // namespace pw::rpc::internal |