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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
// 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.
#pragma once
#include <span>
#include "pw_rpc/channel.h"
#include "pw_status/status.h"
namespace pw::rpc::internal {
class Packet;
class Channel : public rpc::Channel {
Channel() = delete;
constexpr Channel(uint32_t id, ChannelOutput* output)
: rpc::Channel(id, output) {}
class OutputBuffer {
constexpr OutputBuffer() = default;
OutputBuffer(const OutputBuffer&) = delete;
OutputBuffer(OutputBuffer&& other) { *this = std::move(other); }
~OutputBuffer() { PW_DCHECK(buffer_.empty()); }
OutputBuffer& operator=(const OutputBuffer&) = delete;
OutputBuffer& operator=(OutputBuffer&& other) {
buffer_ = other.buffer_;
other.buffer_ = {};
return *this;
// Returns a portion of this OutputBuffer to use as the packet payload.
std::span<std::byte> payload(const Packet& packet) const;
friend class Channel;
explicit constexpr OutputBuffer(std::span<std::byte> buffer)
: buffer_(buffer) {}
std::span<std::byte> buffer_;
// Acquires a buffer for the packet.
OutputBuffer AcquireBuffer() const {
return OutputBuffer(output().AcquireBuffer());
Status Send(OutputBuffer& output, const internal::Packet& packet);
} // namespace pw::rpc::internal