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113 lines
3.0 KiB
113 lines
3.0 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/internal/base_server_writer.h"
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#include "pw_assert/assert.h"
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#include "pw_rpc/internal/method.h"
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#include "pw_rpc/internal/packet.h"
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#include "pw_rpc/internal/server.h"
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namespace pw::rpc::internal {
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BaseServerWriter::BaseServerWriter(ServerCall& call)
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: call_(call), state_(kOpen) {
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call_.server().RegisterWriter(*this);
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}
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BaseServerWriter& BaseServerWriter::operator=(BaseServerWriter&& other) {
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Finish();
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state_ = other.state_;
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if (other.open()) {
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other.call_.server().RemoveWriter(other);
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other.state_ = kClosed;
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other.call_.server().RegisterWriter(*this);
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}
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call_ = std::move(other.call_);
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response_ = std::move(other.response_);
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return *this;
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}
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uint32_t BaseServerWriter::method_id() const { return call_.method().id(); }
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Status BaseServerWriter::Finish(Status status) {
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if (!open()) {
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return Status::FailedPrecondition();
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}
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// If the ServerWriter implementer or user forgets to release an acquired
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// buffer before finishing, release it here.
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if (!response_.empty()) {
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ReleasePayloadBuffer();
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}
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Close();
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// Send a control packet indicating that the stream (and RPC) has terminated.
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return call_.channel().Send(Packet(PacketType::SERVER_STREAM_END,
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call_.channel().id(),
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call_.service().id(),
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method().id(),
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{},
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status));
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}
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std::span<std::byte> BaseServerWriter::AcquirePayloadBuffer() {
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PW_DCHECK(open());
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// Only allow having one active buffer at a time.
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if (response_.empty()) {
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response_ = call_.channel().AcquireBuffer();
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}
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return response_.payload(ResponsePacket());
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}
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Status BaseServerWriter::ReleasePayloadBuffer(
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std::span<const std::byte> payload) {
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PW_DCHECK(open());
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return call_.channel().Send(response_, ResponsePacket(payload));
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}
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Status BaseServerWriter::ReleasePayloadBuffer() {
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PW_DCHECK(open());
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call_.channel().Release(response_);
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return OkStatus();
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}
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void BaseServerWriter::Close() {
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if (!open()) {
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return;
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}
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call_.server().RemoveWriter(*this);
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state_ = kClosed;
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}
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Packet BaseServerWriter::ResponsePacket(
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std::span<const std::byte> payload) const {
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return Packet(PacketType::RESPONSE,
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call_.channel().id(),
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call_.service().id(),
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method().id(),
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payload);
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}
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} // namespace pw::rpc::internal
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