156 lines
4.1 KiB
C++
156 lines
4.1 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/ChannelRequester.h"
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namespace rsocket {
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void ChannelRequester::onSubscribe(
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std::shared_ptr<yarpl::flowable::Subscription> subscription) {
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CHECK(!requested_);
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publisherSubscribe(std::move(subscription));
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if (hasInitialRequest_) {
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initStream(std::move(request_));
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}
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}
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void ChannelRequester::onNext(Payload request) {
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if (!requested_) {
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initStream(std::move(request));
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return;
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}
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if (!publisherClosed()) {
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writePayload(std::move(request));
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}
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}
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// TODO: consolidate code in onCompleteImpl, onErrorImpl, cancelImpl
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void ChannelRequester::onComplete() {
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if (!requested_) {
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endStream(StreamCompletionSignal::CANCEL);
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removeFromWriter();
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return;
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}
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if (!publisherClosed()) {
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publisherComplete();
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writeComplete();
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tryCompleteChannel();
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}
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}
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void ChannelRequester::onError(folly::exception_wrapper ex) {
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if (!requested_) {
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endStream(StreamCompletionSignal::CANCEL);
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removeFromWriter();
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return;
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}
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if (!publisherClosed()) {
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publisherComplete();
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endStream(StreamCompletionSignal::ERROR);
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writeApplicationError(ex.get_exception()->what());
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tryCompleteChannel();
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}
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}
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void ChannelRequester::request(int64_t n) {
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if (!requested_) {
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// The initial request has not been sent out yet, hence we must accumulate
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// the unsynchronised allowance, portion of which will be sent out with
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// the initial request frame, and the rest will be dispatched via
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// ConsumerBase:request (ultimately by sending REQUEST_N frames).
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initialResponseAllowance_.add(n);
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return;
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}
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ConsumerBase::generateRequest(n);
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}
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void ChannelRequester::cancel() {
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if (!requested_) {
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endStream(StreamCompletionSignal::CANCEL);
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removeFromWriter();
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return;
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}
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cancelConsumer();
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writeCancel();
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tryCompleteChannel();
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}
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void ChannelRequester::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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CHECK(requested_);
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bool finalComplete = processFragmentedPayload(
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std::move(payload), flagsNext, flagsComplete, flagsFollows);
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if (finalComplete) {
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completeConsumer();
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tryCompleteChannel();
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}
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}
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void ChannelRequester::handleRequestN(uint32_t n) {
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CHECK(requested_);
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PublisherBase::processRequestN(n);
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}
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void ChannelRequester::handleError(folly::exception_wrapper ew) {
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CHECK(requested_);
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errorConsumer(std::move(ew));
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terminatePublisher();
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}
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void ChannelRequester::handleCancel() {
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CHECK(requested_);
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terminatePublisher();
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tryCompleteChannel();
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}
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void ChannelRequester::endStream(StreamCompletionSignal signal) {
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terminatePublisher();
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ConsumerBase::endStream(signal);
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}
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void ChannelRequester::initStream(Payload&& request) {
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requested_ = true;
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const size_t initialN = initialResponseAllowance_.consumeUpTo(kMaxRequestN);
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const size_t remainingN = initialResponseAllowance_.consumeAll();
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// Send as much as possible with the initial request.
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CHECK_GE(kMaxRequestN, initialN);
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newStream(
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StreamType::CHANNEL, static_cast<uint32_t>(initialN), std::move(request));
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// We must inform ConsumerBase about an implicit allowance we have
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// requested from the remote end.
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ConsumerBase::addImplicitAllowance(initialN);
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// Pump the remaining allowance into the ConsumerBase _after_ sending the
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// initial request.
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if (remainingN) {
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ConsumerBase::generateRequest(remainingN);
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}
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}
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void ChannelRequester::tryCompleteChannel() {
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if (publisherClosed() && consumerClosed()) {
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endStream(StreamCompletionSignal::COMPLETE);
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removeFromWriter();
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}
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}
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} // namespace rsocket
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