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RSocketClient.cpp
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242 lines (207 loc) · 8.05 KB
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// Copyright (c) Facebook, Inc. and its affiliates.
//
// 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
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// 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.
#include "rsocket/RSocketClient.h"
#include "rsocket/RSocketRequester.h"
#include "rsocket/RSocketResponder.h"
#include "rsocket/RSocketStats.h"
#include "rsocket/framing/FrameTransportImpl.h"
#include "rsocket/framing/FramedDuplexConnection.h"
#include "rsocket/framing/ScheduledFrameTransport.h"
#include "rsocket/internal/ClientResumeStatusCallback.h"
#include "rsocket/internal/KeepaliveTimer.h"
namespace rsocket {
RSocketClient::RSocketClient(
std::shared_ptr<ConnectionFactory> connectionFactory,
ProtocolVersion protocolVersion,
ResumeIdentificationToken token,
std::shared_ptr<RSocketResponder> responder,
std::chrono::milliseconds keepaliveInterval,
std::shared_ptr<RSocketStats> stats,
std::shared_ptr<RSocketConnectionEvents> connectionEvents,
std::shared_ptr<ResumeManager> resumeManager,
std::shared_ptr<ColdResumeHandler> coldResumeHandler,
folly::EventBase* stateMachineEvb)
: connectionFactory_(std::move(connectionFactory)),
responder_(std::move(responder)),
keepaliveInterval_(keepaliveInterval),
stats_(stats),
connectionEvents_(connectionEvents),
resumeManager_(resumeManager),
coldResumeHandler_(coldResumeHandler),
protocolVersion_(protocolVersion),
token_(std::move(token)),
evb_(stateMachineEvb) {
CHECK(resumeManager_)
<< "provide ResumeManager::makeEmpty() instead of nullptr";
}
RSocketClient::~RSocketClient() {
VLOG(3) << "~RSocketClient ..";
evb_->runImmediatelyOrRunInEventBaseThreadAndWait([sm = stateMachine_] {
auto exn = folly::make_exception_wrapper<std::runtime_error>(
"RSocketClient is closing");
sm->close(std::move(exn), StreamCompletionSignal::CONNECTION_END);
});
}
const std::shared_ptr<RSocketRequester>& RSocketClient::getRequester() const {
return requester_;
}
// Returns if this client is currently disconnected
bool RSocketClient::isDisconnected() const {
return stateMachine_->isDisconnected();
}
folly::Future<folly::Unit> RSocketClient::resume() {
CHECK(connectionFactory_)
<< "The client was likely created without ConnectionFactory. Can't "
<< "resume";
return connectionFactory_->connect(protocolVersion_, ResumeStatus::RESUMING)
.thenValue(
[this](
ConnectionFactory::ConnectedDuplexConnection connection) mutable {
return resumeFromConnection(std::move(connection));
});
}
folly::Future<folly::Unit> RSocketClient::resumeFromConnection(
ConnectionFactory::ConnectedDuplexConnection connection) {
VLOG(2) << "Resuming connection";
if (!evb_) {
// Cold-resumption. EventBase hasn't been explicitly set for SM by the
// application. Use the transport's eventBase.
evb_ = &connection.eventBase;
}
class ResumeCallback : public ClientResumeStatusCallback {
public:
explicit ResumeCallback(folly::Promise<folly::Unit> promise)
: promise_(std::move(promise)) {}
void onResumeOk() noexcept override {
promise_.setValue();
}
void onResumeError(folly::exception_wrapper ex) noexcept override {
promise_.setException(ex);
}
private:
folly::Promise<folly::Unit> promise_;
};
folly::Promise<folly::Unit> promise;
auto future = promise.getFuture();
auto resumeCallback = std::make_unique<ResumeCallback>(std::move(promise));
std::unique_ptr<DuplexConnection> framedConnection;
if (connection.connection->isFramed()) {
framedConnection = std::move(connection.connection);
} else {
framedConnection = std::make_unique<FramedDuplexConnection>(
std::move(connection.connection), protocolVersion_);
}
auto transport =
std::make_shared<FrameTransportImpl>(std::move(framedConnection));
std::shared_ptr<FrameTransport> ft;
if (evb_ != &connection.eventBase) {
// If the StateMachine EventBase is different from the transport
// EventBase, then use ScheduledFrameTransport and
// ScheduledFrameProcessor to ensure the RSocketStateMachine and
// Transport live on the desired EventBases
ft = std::make_shared<ScheduledFrameTransport>(
std::move(transport),
&connection.eventBase, /* Transport EventBase */
evb_); /* StateMachine EventBase */
} else {
ft = std::move(transport);
}
evb_->runInEventBaseThread([this,
frameTransport = std::move(ft),
callback = std::move(resumeCallback)]() mutable {
if (!stateMachine_) {
createState();
}
stateMachine_->resumeClient(
token_,
std::move(frameTransport),
std::move(callback),
protocolVersion_);
});
return future;
}
folly::Future<folly::Unit> RSocketClient::disconnect(
folly::exception_wrapper ew) {
if (!stateMachine_) {
return folly::makeFuture<folly::Unit>(
std::runtime_error{"RSocketClient must always have a state machine"});
}
auto work = [sm = stateMachine_, e = std::move(ew)]() mutable {
sm->disconnect(std::move(e));
};
if (evb_->isInEventBaseThread()) {
VLOG(2) << "Running RSocketClient disconnect synchronously";
work();
return folly::unit;
}
VLOG(2) << "Scheduling RSocketClient disconnect";
return folly::via(evb_, work);
}
void RSocketClient::fromConnection(
std::unique_ptr<DuplexConnection> connection,
folly::EventBase& transportEvb,
SetupParameters params) {
if (!evb_) {
// If no EventBase is given for the stateMachine, then use the transport's
// EventBase to drive the stateMachine.
evb_ = &transportEvb;
}
createState();
std::unique_ptr<DuplexConnection> framed;
if (connection->isFramed()) {
framed = std::move(connection);
} else {
framed = std::make_unique<FramedDuplexConnection>(
std::move(connection), params.protocolVersion);
}
auto transport = std::make_shared<FrameTransportImpl>(std::move(framed));
if (evb_ == &transportEvb) {
stateMachine_->connectClient(std::move(transport), std::move(params));
return;
}
// If the StateMachine EventBase is different from the transport EventBase,
// then use ScheduledFrameTransport and ScheduledFrameProcessor to ensure the
// RSocketStateMachine and Transport live on the desired EventBases.
auto scheduledFT = std::make_shared<ScheduledFrameTransport>(
std::move(transport), &transportEvb, evb_);
evb_->runInEventBaseThread([stateMachine = stateMachine_,
scheduledFT = std::move(scheduledFT),
params = std::move(params)]() mutable {
stateMachine->connectClient(std::move(scheduledFT), std::move(params));
});
}
void RSocketClient::createState() {
// Creation of state is permitted only once for each RSocketClient.
// When evb is removed from RSocketStateMachine, the state can be
// created in constructor
CHECK(!stateMachine_) << "A stateMachine has already been created";
if (!responder_) {
responder_ = std::make_shared<RSocketResponder>();
}
std::unique_ptr<KeepaliveTimer> keepaliveTimer{nullptr};
if (keepaliveInterval_ > std::chrono::milliseconds(0)) {
keepaliveTimer =
std::make_unique<KeepaliveTimer>(keepaliveInterval_, *evb_);
}
stateMachine_ = std::make_shared<RSocketStateMachine>(
std::move(responder_),
std::move(keepaliveTimer),
RSocketMode::CLIENT,
std::move(stats_),
std::move(connectionEvents_),
std::move(resumeManager_),
std::move(coldResumeHandler_));
requester_ = std::make_shared<RSocketRequester>(stateMachine_, *evb_);
}
} // namespace rsocket