136 lines
4.0 KiB
C++
136 lines
4.0 KiB
C++
// Copyright (c) Facebook, Inc. and its affiliates.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://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,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "rsocket/statemachine/RequestResponseRequester.h"
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#include "rsocket/internal/Common.h"
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#include "rsocket/statemachine/RSocketStateMachine.h"
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namespace rsocket {
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void RequestResponseRequester::subscribe(
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std::shared_ptr<yarpl::single::SingleObserver<Payload>> subscriber) {
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DCHECK(state_ != State::CLOSED);
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DCHECK(!consumingSubscriber_);
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consumingSubscriber_ = std::move(subscriber);
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consumingSubscriber_->onSubscribe(shared_from_this());
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if (state_ == State::NEW) {
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state_ = State::REQUESTED;
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newStream(StreamType::REQUEST_RESPONSE, 1, std::move(initialPayload_));
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return;
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}
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if (auto subscriber = std::move(consumingSubscriber_)) {
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subscriber->onError(std::runtime_error("cannot request more than 1 item"));
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}
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removeFromWriter();
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}
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void RequestResponseRequester::cancel() noexcept {
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consumingSubscriber_ = nullptr;
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switch (state_) {
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case State::NEW:
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state_ = State::CLOSED;
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removeFromWriter();
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break;
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case State::REQUESTED: {
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state_ = State::CLOSED;
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writeCancel();
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removeFromWriter();
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} break;
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case State::CLOSED:
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break;
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}
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consumingSubscriber_.reset();
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}
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void RequestResponseRequester::endStream(StreamCompletionSignal signal) {
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switch (state_) {
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case State::NEW:
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case State::REQUESTED:
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// Spontaneous ::endStream signal means an error.
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DCHECK(StreamCompletionSignal::COMPLETE != signal);
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DCHECK(StreamCompletionSignal::CANCEL != signal);
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state_ = State::CLOSED;
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break;
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case State::CLOSED:
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break;
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}
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if (auto subscriber = std::move(consumingSubscriber_)) {
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DCHECK(signal != StreamCompletionSignal::COMPLETE);
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DCHECK(signal != StreamCompletionSignal::CANCEL);
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subscriber->onError(StreamInterruptedException(static_cast<int>(signal)));
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}
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}
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void RequestResponseRequester::handleError(folly::exception_wrapper ew) {
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switch (state_) {
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case State::NEW:
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// Cannot receive a frame before sending the initial request.
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CHECK(false);
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break;
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case State::REQUESTED:
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state_ = State::CLOSED;
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if (auto subscriber = std::move(consumingSubscriber_)) {
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subscriber->onError(std::move(ew));
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}
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removeFromWriter();
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break;
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case State::CLOSED:
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break;
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}
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}
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void RequestResponseRequester::handlePayload(
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Payload&& payload,
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bool /*flagsComplete*/,
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bool flagsNext,
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bool flagsFollows) {
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// (State::NEW) Cannot receive a frame before sending the initial request.
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// (State::CLOSED) should not be receiving frames when closed
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// if we fail here, we broke some internal invariant of the class
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CHECK(state_ == State::REQUESTED);
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payloadFragments_.addPayload(std::move(payload), flagsNext, false);
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if (flagsFollows) {
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// there will be more fragments to come
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return;
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}
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bool finalFlagsNext, finalFlagsComplete;
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Payload finalPayload;
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std::tie(finalPayload, finalFlagsNext, finalFlagsComplete) =
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payloadFragments_.consumePayloadAndFlags();
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state_ = State::CLOSED;
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if (finalPayload || finalFlagsNext) {
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consumingSubscriber_->onSuccess(std::move(finalPayload));
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consumingSubscriber_ = nullptr;
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} else if (!finalFlagsComplete) {
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writeInvalidError("Payload, NEXT or COMPLETE flag expected");
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endStream(StreamCompletionSignal::ERROR);
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}
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removeFromWriter();
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}
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size_t RequestResponseRequester::getConsumerAllowance() const {
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return (state_ == State::REQUESTED) ? 1 : 0;
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}
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} // namespace rsocket
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