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StreamsFactory.cpp
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// Copyright 2004-present Facebook. All Rights Reserved.
#include "rsocket/statemachine/StreamsFactory.h"
#include "rsocket/statemachine/ChannelRequester.h"
#include "rsocket/statemachine/ChannelResponder.h"
#include "rsocket/statemachine/RSocketStateMachine.h"
#include "rsocket/statemachine/RequestResponseRequester.h"
#include "rsocket/statemachine/RequestResponseResponder.h"
#include "rsocket/statemachine/StreamRequester.h"
#include "rsocket/statemachine/StreamResponder.h"
#include "yarpl/flowable/Flowable.h"
#include "yarpl/single/Singles.h"
namespace rsocket {
using namespace yarpl;
StreamsFactory::StreamsFactory(
RSocketStateMachine& connection,
RSocketMode mode)
: connection_(connection),
nextStreamId_(
mode == RSocketMode::CLIENT
? 1 /*Streams initiated by a client MUST use
odd-numbered stream identifiers*/
: 2 /*streams initiated by the server MUST use
even-numbered stream identifiers*/) {}
static void subscribeToErrorFlowable(
Reference<yarpl::flowable::Subscriber<Payload>> responseSink) {
yarpl::flowable::Flowables::error<Payload>(
std::runtime_error("state machine is disconnected/closed"))
->subscribe(std::move(responseSink));
}
static void subscribeToErrorSingle(
Reference<yarpl::single::SingleObserver<Payload>> responseSink) {
yarpl::single::Singles::error<Payload>(
std::runtime_error("state machine is disconnected/closed"))
->subscribe(std::move(responseSink));
}
Reference<yarpl::flowable::Subscriber<Payload>>
StreamsFactory::createChannelRequester(
Reference<yarpl::flowable::Subscriber<Payload>> responseSink) {
if (connection_.isDisconnected()) {
subscribeToErrorFlowable(std::move(responseSink));
return nullptr;
}
auto const streamId = getNextStreamId();
auto stateMachine = yarpl::make_ref<ChannelRequester>(
connection_.shared_from_this(), streamId);
connection_.addStream(streamId, stateMachine);
stateMachine->subscribe(std::move(responseSink));
return stateMachine;
}
void StreamsFactory::createStreamRequester(
Payload request,
Reference<yarpl::flowable::Subscriber<Payload>> responseSink) {
if (connection_.isDisconnected()) {
subscribeToErrorFlowable(std::move(responseSink));
return;
}
auto const streamId = getNextStreamId();
auto stateMachine = yarpl::make_ref<StreamRequester>(
connection_.shared_from_this(), streamId, std::move(request));
connection_.addStream(streamId, stateMachine);
stateMachine->subscribe(std::move(responseSink));
}
void StreamsFactory::createStreamRequester(
Reference<yarpl::flowable::Subscriber<Payload>> responseSink,
StreamId streamId,
size_t n) {
if (connection_.isDisconnected()) {
subscribeToErrorFlowable(std::move(responseSink));
return;
}
auto stateMachine = yarpl::make_ref<StreamRequester>(
connection_.shared_from_this(), streamId, Payload());
// Set requested to true (since cold resumption)
stateMachine->setRequested(n);
connection_.addStream(streamId, stateMachine);
stateMachine->subscribe(std::move(responseSink));
}
void StreamsFactory::createRequestResponseRequester(
Payload payload,
Reference<yarpl::single::SingleObserver<Payload>> responseSink) {
if (connection_.isDisconnected()) {
subscribeToErrorSingle(std::move(responseSink));
return;
}
auto const streamId = getNextStreamId();
auto stateMachine = yarpl::make_ref<RequestResponseRequester>(
connection_.shared_from_this(), streamId, std::move(payload));
connection_.addStream(streamId, stateMachine);
stateMachine->subscribe(std::move(responseSink));
}
StreamId StreamsFactory::getNextStreamId() {
StreamId streamId = nextStreamId_;
CHECK(streamId <= std::numeric_limits<int32_t>::max() - 2);
nextStreamId_ += 2;
return streamId;
}
void StreamsFactory::setNextStreamId(StreamId streamId) {
nextStreamId_ = streamId + 2;
}
bool StreamsFactory::registerNewPeerStreamId(StreamId streamId) {
DCHECK(streamId != 0);
if (nextStreamId_ % 2 == streamId % 2) {
// if this is an unknown stream to the socket and this socket is
// generating
// such stream ids, it is an incoming frame on the stream which no longer
// exist
return false;
}
if (streamId <= lastPeerStreamId_) {
// receiving frame for a stream which no longer exists
return false;
}
lastPeerStreamId_ = streamId;
return true;
}
Reference<ChannelResponder> StreamsFactory::createChannelResponder(
uint32_t initialRequestN,
StreamId streamId) {
auto stateMachine = yarpl::make_ref<ChannelResponder>(
connection_.shared_from_this(), streamId, initialRequestN);
connection_.addStream(streamId, stateMachine);
return stateMachine;
}
Reference<yarpl::flowable::Subscriber<Payload>>
StreamsFactory::createStreamResponder(
uint32_t initialRequestN,
StreamId streamId) {
auto stateMachine = yarpl::make_ref<StreamResponder>(
connection_.shared_from_this(), streamId, initialRequestN);
connection_.addStream(streamId, stateMachine);
return stateMachine;
}
Reference<yarpl::single::SingleObserver<Payload>>
StreamsFactory::createRequestResponseResponder(StreamId streamId) {
auto stateMachine = yarpl::make_ref<RequestResponseResponder>(
connection_.shared_from_this(), streamId);
connection_.addStream(streamId, stateMachine);
return stateMachine;
}
}