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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.
*/
#define MONGO_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kSharding
#include "mongo/platform/basic.h"
#include "mongo/s/client/sharding_connection_hook.h"
#include <string>
#include "mongo/bson/util/bson_extract.h"
#include "mongo/client/authenticate.h"
#include "mongo/db/client.h"
#include "mongo/logv2/log.h"
#include "mongo/rpc/get_status_from_command_result.h"
#include "mongo/s/client/version_manager.h"
#include "mongo/util/log.h"
namespace mongo {
using std::string;
ShardingConnectionHook::ShardingConnectionHook(bool shardedConnections,
std::unique_ptr<rpc::EgressMetadataHook> egressHook)
: _shardedConnections(shardedConnections), _egressHook(std::move(egressHook)) {}
void ShardingConnectionHook::onCreate(DBClientBase* conn) {
if (conn->type() == ConnectionString::INVALID) {
uasserted(ErrorCodes::BadValue, str::stream() << "Unrecognized connection string.");
}
// Authenticate as the first thing we do
// NOTE: Replica set authentication allows authentication against *any* online host
if (auth::isInternalAuthSet()) {
LOGV2_DEBUG(22722, 2, "calling onCreate auth for {conn}", "conn"_attr = conn->toString());
uassertStatusOKWithContext(conn->authenticateInternalUser(),
str::stream() << "can't authenticate to server "
<< conn->getServerAddress());
}
// Delegate the metadata hook logic to the egress hook; use lambdas to pass the arguments in
// the order expected by the egress hook.
if (_shardedConnections) {
conn->setReplyMetadataReader(
[this](OperationContext* opCtx, const BSONObj& metadataObj, StringData target) {
return _egressHook->readReplyMetadata(opCtx, target, metadataObj);
});
}
conn->setRequestMetadataWriter([this](OperationContext* opCtx, BSONObjBuilder* metadataBob) {
return _egressHook->writeRequestMetadata(opCtx, metadataBob);
});
if (conn->type() == ConnectionString::MASTER) {
BSONObj isMasterResponse;
if (!conn->runCommand("admin", BSON("ismaster" << 1), isMasterResponse)) {
uassertStatusOK(getStatusFromCommandResult(isMasterResponse));
}
long long configServerModeNumber;
Status status =
bsonExtractIntegerField(isMasterResponse, "configsvr", &configServerModeNumber);
if (status == ErrorCodes::NoSuchKey) {
// This isn't a config server we're talking to.
return;
}
uassertStatusOK(status);
const long long minKnownConfigServerMode = 1;
const long long maxKnownConfigServerMode = 2;
uassert(28785,
str::stream() << "Unrecognized configsvr mode number: " << configServerModeNumber
<< ". Range of known configsvr mode numbers is: ["
<< minKnownConfigServerMode << ", " << maxKnownConfigServerMode
<< "]",
configServerModeNumber >= minKnownConfigServerMode &&
configServerModeNumber <= maxKnownConfigServerMode);
uassertStatusOK(status);
}
}
void ShardingConnectionHook::onDestroy(DBClientBase* conn) {
if (_shardedConnections && versionManager.isVersionableCB(conn)) {
versionManager.resetShardVersionCB(conn);
}
}
void ShardingConnectionHook::onRelease(DBClientBase* conn) {
// This is currently for making the replica set connections release
// secondary connections to the pool.
conn->reset();
}
} // namespace mongo
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