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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 <algorithm>
#include <stdexcept>
#include <stdint.h>
#include <thrift/server/TServerFramework.h>
namespace apache {
namespace thrift {
namespace server {
using apache::thrift::concurrency::Synchronized;
using apache::thrift::protocol::TProtocol;
using apache::thrift::protocol::TProtocolFactory;
using std::bind;
using std::shared_ptr;
using apache::thrift::transport::TServerTransport;
using apache::thrift::transport::TTransport;
using apache::thrift::transport::TTransportException;
using apache::thrift::transport::TTransportFactory;
using std::string;
TServerFramework::TServerFramework(const shared_ptr<TProcessorFactory>& processorFactory,
const shared_ptr<TServerTransport>& serverTransport,
const shared_ptr<TTransportFactory>& transportFactory,
const shared_ptr<TProtocolFactory>& protocolFactory)
: TServer(processorFactory, serverTransport, transportFactory, protocolFactory),
clients_(0),
hwm_(0),
limit_(INT64_MAX) {
}
TServerFramework::TServerFramework(const shared_ptr<TProcessor>& processor,
const shared_ptr<TServerTransport>& serverTransport,
const shared_ptr<TTransportFactory>& transportFactory,
const shared_ptr<TProtocolFactory>& protocolFactory)
: TServer(processor, serverTransport, transportFactory, protocolFactory),
clients_(0),
hwm_(0),
limit_(INT64_MAX) {
}
TServerFramework::TServerFramework(const shared_ptr<TProcessorFactory>& processorFactory,
const shared_ptr<TServerTransport>& serverTransport,
const shared_ptr<TTransportFactory>& inputTransportFactory,
const shared_ptr<TTransportFactory>& outputTransportFactory,
const shared_ptr<TProtocolFactory>& inputProtocolFactory,
const shared_ptr<TProtocolFactory>& outputProtocolFactory)
: TServer(processorFactory,
serverTransport,
inputTransportFactory,
outputTransportFactory,
inputProtocolFactory,
outputProtocolFactory),
clients_(0),
hwm_(0),
limit_(INT64_MAX) {
}
TServerFramework::TServerFramework(const shared_ptr<TProcessor>& processor,
const shared_ptr<TServerTransport>& serverTransport,
const shared_ptr<TTransportFactory>& inputTransportFactory,
const shared_ptr<TTransportFactory>& outputTransportFactory,
const shared_ptr<TProtocolFactory>& inputProtocolFactory,
const shared_ptr<TProtocolFactory>& outputProtocolFactory)
: TServer(processor,
serverTransport,
inputTransportFactory,
outputTransportFactory,
inputProtocolFactory,
outputProtocolFactory),
clients_(0),
hwm_(0),
limit_(INT64_MAX) {
}
TServerFramework::~TServerFramework() = default;
template <typename T>
static void releaseOneDescriptor(const string& name, T& pTransport) {
if (pTransport) {
try {
pTransport->close();
} catch (const TTransportException& ttx) {
string errStr = string("TServerFramework " + name + " close failed: ") + ttx.what();
GlobalOutput(errStr.c_str());
}
}
}
void TServerFramework::serve() {
shared_ptr<TTransport> client;
shared_ptr<TTransport> inputTransport;
shared_ptr<TTransport> outputTransport;
shared_ptr<TProtocol> inputProtocol;
shared_ptr<TProtocol> outputProtocol;
// Start the server listening
serverTransport_->listen();
// Run the preServe event to indicate server is now listening
// and that it is safe to connect.
if (eventHandler_) {
eventHandler_->preServe();
}
// Fetch client from server
for (;;) {
try {
// Dereference any resources from any previous client creation
// such that a blocking accept does not hold them indefinitely.
outputProtocol.reset();
inputProtocol.reset();
outputTransport.reset();
inputTransport.reset();
client.reset();
// If we have reached the limit on the number of concurrent
// clients allowed, wait for one or more clients to drain before
// accepting another.
{
Synchronized sync(mon_);
while (clients_ >= limit_) {
mon_.wait();
}
}
client = serverTransport_->accept();
inputTransport = inputTransportFactory_->getTransport(client);
outputTransport = outputTransportFactory_->getTransport(client);
if (!outputProtocolFactory_) {
inputProtocol = inputProtocolFactory_->getProtocol(inputTransport, outputTransport);
outputProtocol = inputProtocol;
} else {
inputProtocol = inputProtocolFactory_->getProtocol(inputTransport);
outputProtocol = outputProtocolFactory_->getProtocol(outputTransport);
}
newlyConnectedClient(shared_ptr<TConnectedClient>(
new TConnectedClient(getProcessor(inputProtocol, outputProtocol, client),
inputProtocol,
outputProtocol,
eventHandler_,
client),
bind(&TServerFramework::disposeConnectedClient, this, std::placeholders::_1)));
} catch (TTransportException& ttx) {
releaseOneDescriptor("inputTransport", inputTransport);
releaseOneDescriptor("outputTransport", outputTransport);
releaseOneDescriptor("client", client);
if (ttx.getType() == TTransportException::TIMED_OUT
|| ttx.getType() == TTransportException::CLIENT_DISCONNECT) {
// Accept timeout and client disconnect - continue processing.
continue;
} else if (ttx.getType() == TTransportException::END_OF_FILE
|| ttx.getType() == TTransportException::INTERRUPTED) {
// Server was interrupted. This only happens when stopping.
break;
} else {
// All other transport exceptions are logged.
// State of connection is unknown. Done.
string errStr = string("TServerTransport died: ") + ttx.what();
GlobalOutput(errStr.c_str());
break;
}
}
}
releaseOneDescriptor("serverTransport", serverTransport_);
}
int64_t TServerFramework::getConcurrentClientLimit() const {
Synchronized sync(mon_);
return limit_;
}
int64_t TServerFramework::getConcurrentClientCount() const {
Synchronized sync(mon_);
return clients_;
}
int64_t TServerFramework::getConcurrentClientCountHWM() const {
Synchronized sync(mon_);
return hwm_;
}
void TServerFramework::setConcurrentClientLimit(int64_t newLimit) {
if (newLimit < 1) {
throw std::invalid_argument("newLimit must be greater than zero");
}
Synchronized sync(mon_);
limit_ = newLimit;
if (limit_ - clients_ > 0) {
mon_.notify();
}
}
void TServerFramework::stop() {
// Order is important because serve() releases serverTransport_ when it is
// interrupted, which closes the socket that interruptChildren uses.
serverTransport_->interruptChildren();
serverTransport_->interrupt();
}
void TServerFramework::newlyConnectedClient(const shared_ptr<TConnectedClient>& pClient) {
{
Synchronized sync(mon_);
++clients_;
hwm_ = (std::max)(hwm_, clients_);
}
onClientConnected(pClient);
}
void TServerFramework::disposeConnectedClient(TConnectedClient* pClient) {
onClientDisconnected(pClient);
delete pClient;
Synchronized sync(mon_);
if (limit_ - --clients_ > 0) {
mon_.notify();
}
}
}
}
} // apache::thrift::server
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