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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.
*/
// _ todo: reconnect?
#define MONGO_LOGV2_DEFAULT_COMPONENT ::mongo::logv2::LogComponent::kNetwork
#include "mongo/platform/basic.h"
#include "mongo/client/connpool.h"
#include <limits>
#include <string>
#include "mongo/base/init.h"
#include "mongo/client/connection_string.h"
#include "mongo/client/dbclient_connection.h"
#include "mongo/client/global_conn_pool.h"
#include "mongo/client/replica_set_monitor.h"
#include "mongo/executor/connection_pool_stats.h"
#include "mongo/logv2/log.h"
#include "mongo/stdx/chrono.h"
#include "mongo/util/exit.h"
#include "mongo/util/net/socket_exception.h"
#if !defined(__has_feature)
#define __has_feature(x) 0
#endif
#if __has_feature(address_sanitizer)
#include <sanitizer/lsan_interface.h>
#endif
namespace mongo {
namespace {
const int kDefaultIdleTimeout = std::numeric_limits<int>::max();
const int kDefaultMaxInUse = std::numeric_limits<int>::max();
auto makeDuration(double secs) {
return Milliseconds(static_cast<Milliseconds::rep>(1000 * secs));
}
} // namespace
using std::endl;
using std::list;
using std::map;
using std::set;
using std::string;
using std::vector;
// ------ PoolForHost ------
PoolForHost::PoolForHost()
: _created(0),
_minValidCreationTimeMicroSec(0),
_type(ConnectionString::INVALID),
_maxPoolSize(kPoolSizeUnlimited),
_maxInUse(kDefaultMaxInUse),
_checkedOut(0),
_badConns(0),
_parentDestroyed(false),
_inShutdown(false) {}
PoolForHost::~PoolForHost() {
clear();
}
void PoolForHost::clear() {
if (!_parentDestroyed) {
LOGV2(24124,
"Dropping all pooled connections to {connString} "
"(with timeout of {timeoutSecs} seconds)",
"Dropping all pooled connections to a host",
"connString"_attr = _hostName,
"socketTimeout"_attr = makeDuration(_socketTimeoutSecs));
}
_pool = decltype(_pool){};
}
auto PoolForHost::done(DBConnectionPool* pool, DBClientBase* c) -> ConnectionHealth {
const bool isFailed = c->isFailed();
--_checkedOut;
// Remember that this host had a broken connection for later
if (isFailed) {
reportBadConnectionAt(c->getSockCreationMicroSec());
}
// Another (later) connection was reported as broken to this host
bool isBroken = c->getSockCreationMicroSec() < _minValidCreationTimeMicroSec;
if (isFailed || isBroken) {
_badConns++;
LOGV2(24125,
"Ending connection to {connString} (with timeout of {socketTimeout}) "
"due to bad connection status; {numOpenConns} connections to that host remain open",
"Ending connection to a host due to a bad connection status",
"connString"_attr = _hostName,
"socketTimeout"_attr = makeDuration(_socketTimeoutSecs),
"numOpenConns"_attr = openConnections());
return ConnectionHealth::kFailed;
} else if (_maxPoolSize >= 0 && static_cast<int>(_pool.size()) >= _maxPoolSize) {
// We have a pool size that we need to enforce
LOGV2(24126,
"Ending idle connection to {connString} (with timeout of {socketTimeout}) "
"because its pool meets constraints; "
"{numOpenConns} connections to that host remain open",
"Ending idle connection to a host because its pool mees constraints",
"connString"_attr = _hostName,
"socketTimeout"_attr = makeDuration(_socketTimeoutSecs),
"numOpenConns"_attr = openConnections());
return ConnectionHealth::kTooMany;
}
// The connection is probably fine, save for later
_pool.push(std::unique_ptr<DBClientBase>(c));
return ConnectionHealth::kReuseable;
}
void PoolForHost::reportBadConnectionAt(uint64_t microSec) {
if (microSec != DBClientBase::INVALID_SOCK_CREATION_TIME &&
microSec > _minValidCreationTimeMicroSec) {
_minValidCreationTimeMicroSec = microSec;
LOGV2(24127,
"Detected bad connection created at {currentTime}, "
"clearing pool for {connString} of {numOpenConns} connections",
"Detected bad connection, clearing pool for host",
"currentTime"_attr =
Microseconds(static_cast<Microseconds::rep>(_minValidCreationTimeMicroSec)),
"connString"_attr = _hostName,
"numOpenConns"_attr = openConnections());
clear();
}
}
bool PoolForHost::isBadSocketCreationTime(uint64_t microSec) {
return microSec != DBClientBase::INVALID_SOCK_CREATION_TIME &&
microSec <= _minValidCreationTimeMicroSec;
}
DBClientBase* PoolForHost::get(DBConnectionPool* pool, double socketTimeout) {
while (!_pool.empty()) {
auto sc = std::move(_pool.top());
_pool.pop();
if (!sc.ok()) {
_badConns++;
pool->onDestroy(sc.conn.get());
continue;
}
verify(sc.conn->getSoTimeout() == socketTimeout);
++_checkedOut;
return sc.conn.release();
}
return nullptr;
}
void PoolForHost::flush() {
clear();
}
void PoolForHost::getStaleConnections(Date_t idleThreshold, vector<DBClientBase*>& stale) {
vector<StoredConnection> all;
while (!_pool.empty()) {
StoredConnection c = std::move(_pool.top());
_pool.pop();
if (c.ok() && !c.addedBefore(idleThreshold)) {
all.push_back(std::move(c));
} else {
_badConns++;
stale.emplace_back(c.conn.release());
}
}
for (auto& conn : all) {
_pool.push(std::move(conn));
}
}
PoolForHost::StoredConnection::StoredConnection(std::unique_ptr<DBClientBase> c)
: conn(std::move(c)), added(Date_t::now()) {}
bool PoolForHost::StoredConnection::ok() {
// Poke the connection to see if we're still ok
return conn->isStillConnected();
}
bool PoolForHost::StoredConnection::addedBefore(Date_t time) {
return added < time;
}
void PoolForHost::createdOne(DBClientBase* base) {
if (_created == 0)
_type = base->type();
++_created;
// _checkedOut is used to indicate the number of in-use connections so
// though we didn't actually check this connection out, we bump it here.
++_checkedOut;
}
void PoolForHost::initializeHostName(const std::string& hostName) {
if (_hostName.empty()) {
_hostName = hostName;
}
}
void PoolForHost::waitForFreeConnection(int timeout, stdx::unique_lock<Latch>& lk) {
auto condition = [&] { return (numInUse() < _maxInUse || _inShutdown.load()); };
if (timeout > 0) {
stdx::chrono::seconds timeoutSeconds{timeout};
// If we timed out waiting without getting a new connection, throw.
uassert(ErrorCodes::ExceededTimeLimit,
str::stream() << "too many connections to " << _hostName << ":" << timeout,
!_cv.wait_for(lk, timeoutSeconds, condition));
} else {
_cv.wait(lk, condition);
}
}
void PoolForHost::notifyWaiters() {
_cv.notify_one();
}
void PoolForHost::shutdown() {
_inShutdown.store(true);
_cv.notify_all();
}
// ------ DBConnectionPool::Detail ------
class DBConnectionPool::Detail {
public:
template <typename Connect>
static DBClientBase* get(DBConnectionPool* _this,
const std::string& host,
double timeout,
Connect connect) {
while (!(_this->_inShutdown.load())) {
// Get a connection from the pool, if there is one.
std::unique_ptr<DBClientBase> c(_this->_get(host, timeout));
if (c) {
// This call may throw.
_this->onHandedOut(c.get());
return c.release();
}
// If there are no pooled connections for this host, create a new connection. If
// there are too many connections in this pool to make a new one, block until a
// connection is released.
{
stdx::unique_lock<Latch> lk(_this->_mutex);
PoolForHost& p = _this->_pools[PoolKey(host, timeout)];
if (p.openConnections() >= _this->_maxInUse) {
LOGV2(20112,
"Too many in-use connections; "
"waiting until there are fewer than {maxInUseConns}",
"Too many in-use connections; waiting until there are fewer than maximum",
"maxInUseConns"_attr = _this->_maxInUse);
p.waitForFreeConnection(timeout, lk);
} else {
// Drop the lock here, so we can connect without holding it.
// _finishCreate will take the lock again.
lk.unlock();
// Create a new connection and return. All Connect functions
// should throw if they cannot create a connection.
auto c = connect();
invariant(c);
return _this->_finishCreate(host, timeout, c);
}
}
}
// If we get here, we are in shutdown, and it does not matter what we return.
invariant(_this->_inShutdown.load());
uassert(ErrorCodes::ShutdownInProgress, "connection pool is in shutdown", false);
MONGO_UNREACHABLE;
}
};
// ------ DBConnectionPool ------
const int PoolForHost::kPoolSizeUnlimited(-1);
DBConnectionPool::DBConnectionPool()
: _name("dbconnectionpool"),
_maxPoolSize(PoolForHost::kPoolSizeUnlimited),
_maxInUse(kDefaultMaxInUse),
_idleTimeout(kDefaultIdleTimeout),
_inShutdown(false),
_hooks(new list<DBConnectionHook*>())
{}
void DBConnectionPool::shutdown() {
if (!_inShutdown.swap(true)) {
stdx::lock_guard<Latch> L(_mutex);
for (auto i = _pools.begin(); i != _pools.end(); i++) {
PoolForHost& p = i->second;
p.shutdown();
}
}
}
DBClientBase* DBConnectionPool::_get(const string& ident, double socketTimeout) {
uassert(ErrorCodes::ShutdownInProgress,
"Can't use connection pool during shutdown",
!globalInShutdownDeprecated());
stdx::lock_guard<Latch> L(_mutex);
PoolForHost& p = _pools[PoolKey(ident, socketTimeout)];
p.setMaxPoolSize(_maxPoolSize);
p.setSocketTimeout(socketTimeout);
p.initializeHostName(ident);
return p.get(this, socketTimeout);
}
int DBConnectionPool::openConnections(const string& ident, double socketTimeout) {
stdx::lock_guard<Latch> L(_mutex);
PoolForHost& p = _pools[PoolKey(ident, socketTimeout)];
return p.openConnections();
}
DBClientBase* DBConnectionPool::_finishCreate(const string& ident,
double socketTimeout,
DBClientBase* conn) {
{
stdx::lock_guard<Latch> L(_mutex);
PoolForHost& p = _pools[PoolKey(ident, socketTimeout)];
p.setMaxPoolSize(_maxPoolSize);
p.initializeHostName(ident);
p.createdOne(conn);
}
try {
onCreate(conn);
onHandedOut(conn);
} catch (std::exception&) {
delete conn;
throw;
}
LOGV2(20113,
"Successfully connected to {connString} "
"({numOpenConns} connections now open to that host "
"with a {socketTimeoutSecs} second timeout)",
"Successfully connected to host",
"connString"_attr = ident,
"numOpenConns"_attr = openConnections(ident, socketTimeout),
"socketTimeoutSecs"_attr = socketTimeout);
return conn;
}
DBClientBase* DBConnectionPool::get(const ConnectionString& url, double socketTimeout) {
auto connect = [&]() {
string errmsg;
auto c = url.connect(StringData(), errmsg, socketTimeout).release();
uassert(13328, _name + ": connect failed " + url.toString() + " : " + errmsg, c);
return c;
};
return Detail::get(this, url.toString(), socketTimeout, connect);
}
DBClientBase* DBConnectionPool::get(const string& host, double socketTimeout) {
auto connect = [&] {
const ConnectionString cs(uassertStatusOK(ConnectionString::parse(host)));
string errmsg;
auto c = cs.connect(StringData(), errmsg, socketTimeout).release();
if (!c) {
throwSocketError(SocketErrorKind::CONNECT_ERROR,
host,
str::stream() << _name << " error: " << errmsg);
}
return c;
};
return Detail::get(this, host, socketTimeout, connect);
}
DBClientBase* DBConnectionPool::get(const MongoURI& uri, double socketTimeout) {
auto connect = [&] {
string errmsg;
std::unique_ptr<DBClientBase> c(uri.connect(uri.getAppName().get(), errmsg, socketTimeout));
uassert(40356, _name + ": connect failed " + uri.toString() + " : " + errmsg, c);
return c.release();
};
return Detail::get(this, uri.toString(), socketTimeout, connect);
}
int DBConnectionPool::getNumAvailableConns(const string& host, double socketTimeout) const {
stdx::lock_guard<Latch> L(_mutex);
auto it = _pools.find(PoolKey(host, socketTimeout));
return (it == _pools.end()) ? 0 : it->second.numAvailable();
}
int DBConnectionPool::getNumBadConns(const string& host, double socketTimeout) const {
stdx::lock_guard<Latch> L(_mutex);
auto it = _pools.find(PoolKey(host, socketTimeout));
return (it == _pools.end()) ? 0 : it->second.getNumBadConns();
}
void DBConnectionPool::onRelease(DBClientBase* conn) {
if (_hooks->empty()) {
return;
}
for (list<DBConnectionHook*>::iterator i = _hooks->begin(); i != _hooks->end(); i++) {
(*i)->onRelease(conn);
}
}
void DBConnectionPool::release(const string& host, DBClientBase* c) {
onRelease(c);
PoolForHost* pool;
PoolForHost::ConnectionHealth health;
{
// Grab our pool and update its accounting
stdx::lock_guard lk(_mutex);
pool = &_pools[PoolKey(host, c->getSoTimeout())];
health = pool->done(this, c);
}
if (health != PoolForHost::ConnectionHealth::kReuseable) {
// If the connection wasn't okay, destroy it
onDestroy(c);
delete c;
}
pool->notifyWaiters();
}
void DBConnectionPool::decrementEgress(const string& host, DBClientBase* c) {
stdx::lock_guard L(_mutex);
PoolForHost& p = _pools[PoolKey(host, c->getSoTimeout())];
--p._checkedOut;
}
DBConnectionPool::~DBConnectionPool() {
// Do not log in destruction, because global connection pools get
// destroyed after the logging framework.
stdx::lock_guard<Latch> L(_mutex);
for (PoolMap::iterator i = _pools.begin(); i != _pools.end(); i++) {
PoolForHost& p = i->second;
p._parentDestroyed = true;
}
#if __has_feature(address_sanitizer)
__lsan_ignore_object(_hooks);
#endif
}
void DBConnectionPool::flush() {
stdx::lock_guard<Latch> L(_mutex);
for (PoolMap::iterator i = _pools.begin(); i != _pools.end(); i++) {
PoolForHost& p = i->second;
p.flush();
}
}
void DBConnectionPool::clear() {
stdx::lock_guard<Latch> L(_mutex);
LOGV2_DEBUG(20114,
2,
"Removing connections on all pools owned by {poolName}",
"Removing all connectionns associated with this set of pools",
"poolName"_attr = _name);
for (PoolMap::iterator iter = _pools.begin(); iter != _pools.end(); ++iter) {
iter->second.clear();
}
}
void DBConnectionPool::removeHost(const string& host) {
stdx::lock_guard<Latch> L(_mutex);
LOGV2_DEBUG(20115,
2,
"Removing connections from all pools to {connString}",
"Removing connections from all pools to a host",
"connString"_attr = host);
for (PoolMap::iterator i = _pools.begin(); i != _pools.end(); ++i) {
const string& poolHost = i->first.ident;
if (!serverNameCompare()(host, poolHost) && !serverNameCompare()(poolHost, host)) {
// hosts are the same
i->second.clear();
}
}
}
void DBConnectionPool::addHook(DBConnectionHook* hook) {
_hooks->push_back(hook);
}
void DBConnectionPool::onCreate(DBClientBase* conn) {
if (_hooks->size() == 0)
return;
for (list<DBConnectionHook*>::iterator i = _hooks->begin(); i != _hooks->end(); i++) {
(*i)->onCreate(conn);
}
}
void DBConnectionPool::onHandedOut(DBClientBase* conn) {
if (_hooks->size() == 0)
return;
for (list<DBConnectionHook*>::iterator i = _hooks->begin(); i != _hooks->end(); i++) {
(*i)->onHandedOut(conn);
}
}
void DBConnectionPool::onDestroy(DBClientBase* conn) {
if (_hooks->size() == 0)
return;
for (list<DBConnectionHook*>::iterator i = _hooks->begin(); i != _hooks->end(); i++) {
(*i)->onDestroy(conn);
}
}
void DBConnectionPool::appendConnectionStats(executor::ConnectionPoolStats* stats) const {
{
stdx::lock_guard<Latch> lk(_mutex);
for (PoolMap::const_iterator i = _pools.begin(); i != _pools.end(); ++i) {
if (i->second.numCreated() == 0)
continue;
// Mongos may use either a replica set uri or a list of addresses as
// the identifier here, so we always take the first server parsed out
// as our label for connPoolStats. Note that these stats will collide
// with any existing stats for the chosen host.
auto uri = ConnectionString::parse(i->first.ident);
invariant(uri.isOK());
HostAndPort host = uri.getValue().getServers().front();
executor::ConnectionStatsPer hostStats{static_cast<size_t>(i->second.numInUse()),
static_cast<size_t>(i->second.numAvailable()),
static_cast<size_t>(i->second.numCreated()),
0};
stats->updateStatsForHost("global", host, hostStats);
}
}
}
bool DBConnectionPool::serverNameCompare::operator()(const string& a, const string& b) const {
const char* ap = a.c_str();
const char* bp = b.c_str();
while (true) {
if (*ap == '\0' || *ap == '/') {
if (*bp == '\0' || *bp == '/')
return false; // equal strings
else
return true; // a is shorter
}
if (*bp == '\0' || *bp == '/')
return false; // b is shorter
if (*ap < *bp)
return true;
else if (*ap > *bp)
return false;
++ap;
++bp;
}
verify(false);
}
bool DBConnectionPool::poolKeyCompare::operator()(const PoolKey& a, const PoolKey& b) const {
if (DBConnectionPool::serverNameCompare()(a.ident, b.ident))
return true;
if (DBConnectionPool::serverNameCompare()(b.ident, a.ident))
return false;
return a.timeout < b.timeout;
}
bool DBConnectionPool::isConnectionGood(const string& hostName, DBClientBase* conn) {
if (conn == nullptr) {
return false;
}
if (conn->isFailed()) {
return false;
}
{
stdx::lock_guard<Latch> sl(_mutex);
PoolForHost& pool = _pools[PoolKey(hostName, conn->getSoTimeout())];
if (pool.isBadSocketCreationTime(conn->getSockCreationMicroSec())) {
return false;
}
}
return true;
}
void DBConnectionPool::taskDoWork() {
vector<DBClientBase*> toDelete;
auto idleThreshold = Date_t::now() - _idleTimeout;
{
// we need to get the connections inside the lock
// but we can actually delete them outside
stdx::lock_guard<Latch> lk(_mutex);
for (PoolMap::iterator i = _pools.begin(); i != _pools.end(); ++i) {
i->second.getStaleConnections(idleThreshold, toDelete);
}
}
for (size_t i = 0; i < toDelete.size(); i++) {
try {
onDestroy(toDelete[i]);
delete toDelete[i];
} catch (...) {
// we don't care if there was a socket error
}
}
}
// ------ ScopedDbConnection ------
ScopedDbConnection::ScopedDbConnection(const std::string& host, double socketTimeout)
: _host(host),
_conn(globalConnPool.get(host, socketTimeout)),
_socketTimeoutSecs(socketTimeout) {
_setSocketTimeout();
}
ScopedDbConnection::ScopedDbConnection(const ConnectionString& host, double socketTimeout)
: _host(host.toString()),
_conn(globalConnPool.get(host, socketTimeout)),
_socketTimeoutSecs(socketTimeout) {
_setSocketTimeout();
}
ScopedDbConnection::ScopedDbConnection(const MongoURI& uri, double socketTimeout)
: _host(uri.toString()),
_conn(globalConnPool.get(uri, socketTimeout)),
_socketTimeoutSecs(socketTimeout) {
_setSocketTimeout();
}
void ScopedDbConnection::done() {
if (!_conn) {
return;
}
globalConnPool.release(_host, _conn);
_conn = nullptr;
}
void ScopedDbConnection::kill() {
globalConnPool.decrementEgress(_host, _conn);
delete _conn;
_conn = nullptr;
}
void ScopedDbConnection::_setSocketTimeout() {
if (!_conn)
return;
if (_conn->type() == ConnectionString::MASTER)
static_cast<DBClientConnection*>(_conn)->setSoTimeout(_socketTimeoutSecs);
}
ScopedDbConnection::~ScopedDbConnection() {
if (_conn) {
if (_conn->isFailed()) {
if (_conn->getSockCreationMicroSec() == DBClientBase::INVALID_SOCK_CREATION_TIME) {
kill();
} else {
// The pool takes care of deleting the failed connection - this
// will also trigger disposal of older connections in the pool
done();
}
} else {
/* see done() comments above for why we log this line */
LOGV2(24128,
"Scoped connection to {connString} not being returned to the pool",
"Scoped connection not being returned to the pool",
"connString"_attr = _conn->getServerAddress());
kill();
}
}
}
void ScopedDbConnection::clearPool() {
globalConnPool.clear();
}
AtomicWord<int> AScopedConnection::_numConnections;
MONGO_INITIALIZER(SetupDBClientBaseWithConnection)(InitializerContext*) {
DBClientBase::withConnection_do_not_use = [](std::string host,
std::function<void(DBClientBase*)> cb) {
ScopedDbConnection conn(host);
cb(conn.get());
conn.done();
};
return Status::OK();
}
} // namespace mongo
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