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/**
* Copyright (C) 2018-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the Server Side Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
/* Client represents a connection to the database (the server-side) and corresponds
to an open socket (or logical connection if pooling on sockets) from a client.
*/
#include "mongo/platform/basic.h"
#include "mongo/db/client.h"
#include <boost/functional/hash.hpp>
#include <string>
#include <vector>
#include "mongo/base/status.h"
#include "mongo/db/operation_context.h"
#include "mongo/db/operation_cpu_timer.h"
#include "mongo/db/service_context.h"
#include "mongo/platform/compiler.h"
#include "mongo/stdx/thread.h"
#include "mongo/util/concurrency/thread_name.h"
#include "mongo/util/exit.h"
#include "mongo/util/str.h"
namespace mongo {
namespace {
thread_local ServiceContext::UniqueClient currentClient;
void invariantNoCurrentClient() {
invariant(!haveClient(),
str::stream() << "Already have client on this thread: " //
<< '"' << Client::getCurrent()->desc() << '"');
}
} // namespace
void Client::initThread(StringData desc, std::shared_ptr<transport::Session> session) {
initThread(desc, getGlobalServiceContext(), std::move(session));
}
void Client::initThread(StringData desc,
ServiceContext* service,
std::shared_ptr<transport::Session> session) {
invariantNoCurrentClient();
std::string fullDesc;
if (session) {
fullDesc = str::stream() << desc << session->id();
} else {
fullDesc = desc.toString();
}
setThreadName(fullDesc);
// Create the client obj, attach to thread
currentClient = service->makeClient(fullDesc, std::move(session));
}
namespace {
int64_t generateSeed(const std::string& desc) {
size_t seed = 0;
boost::hash_combine(seed, Date_t::now().asInt64());
boost::hash_combine(seed, desc);
return seed;
}
} // namespace
Client::Client(std::string desc,
ServiceContext* serviceContext,
std::shared_ptr<transport::Session> session)
: _serviceContext(serviceContext),
_session(std::move(session)),
_desc(std::move(desc)),
_connectionId(_session ? _session->id() : 0),
_prng(generateSeed(_desc)),
_uuid(UUID::gen()) {}
void Client::reportState(BSONObjBuilder& builder) {
builder.append("desc", desc());
if (_connectionId) {
builder.appendNumber("connectionId", _connectionId);
}
if (hasRemote()) {
builder.append("client", getRemote().toString());
}
}
ServiceContext::UniqueOperationContext Client::makeOperationContext() {
return getServiceContext()->makeOperationContext(this);
}
std::string Client::clientAddress(bool includePort) const {
if (!hasRemote()) {
return "";
}
if (includePort) {
return getRemote().toString();
}
return getRemote().host();
}
Client* Client::getCurrent() {
return currentClient.get();
}
std::unique_ptr<Locker> Client::swapLockState(std::unique_ptr<Locker> locker) {
scoped_spinlock scopedLock(_lock);
invariant(_opCtx);
return _opCtx->swapLockState(std::move(locker), scopedLock);
}
Client& cc() {
invariant(haveClient());
return *Client::getCurrent();
}
bool haveClient() {
return static_cast<bool>(currentClient);
}
ServiceContext::UniqueClient Client::releaseCurrent() {
invariant(haveClient(), "No client to release");
if (auto opCtx = currentClient->_opCtx)
if (auto timers = OperationCPUTimers::get(opCtx))
timers->onThreadDetach();
return std::move(currentClient);
}
void Client::setCurrent(ServiceContext::UniqueClient client) {
invariantNoCurrentClient();
currentClient = std::move(client);
if (auto opCtx = currentClient->_opCtx)
if (auto timers = OperationCPUTimers::get(opCtx))
timers->onThreadAttach();
}
/**
* User connections are listed active so long as they are associated with an opCtx.
* Non-user connections are listed active if they have an opCtx and not waiting on a condvar.
*/
bool Client::hasAnyActiveCurrentOp() const {
if (!_opCtx)
return false;
if (isFromUserConnection() || !_opCtx->isWaitingForConditionOrInterrupt())
return true;
return false;
}
void Client::setKilled() noexcept {
stdx::lock_guard<Client> lk(*this);
_killed.store(true);
if (_opCtx) {
_serviceContext->killOperation(lk, _opCtx, ErrorCodes::ClientMarkedKilled);
}
}
ThreadClient::ThreadClient(ServiceContext* serviceContext)
: ThreadClient(getThreadName(), serviceContext, nullptr) {}
ThreadClient::ThreadClient(StringData desc,
ServiceContext* serviceContext,
std::shared_ptr<transport::Session> session) {
invariantNoCurrentClient();
_originalThreadName = getThreadNameRef();
Client::initThread(desc, serviceContext, std::move(session));
}
ThreadClient::~ThreadClient() {
invariant(currentClient);
currentClient.reset(nullptr);
setThreadNameRef(std::move(_originalThreadName));
}
Client* ThreadClient::get() const {
return &cc();
}
} // namespace mongo
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