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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_LOGV2_DEFAULT_COMPONENT ::mongo::logv2::LogComponent::kDefault
#include "mongo/platform/basic.h"
#include "mongo/db/dbdirectclient.h"
#include <boost/core/swap.hpp>
#include "mongo/db/client.h"
#include "mongo/db/commands.h"
#include "mongo/db/curop.h"
#include "mongo/db/operation_context.h"
#include "mongo/db/repl/replication_coordinator.h"
#include "mongo/db/wire_version.h"
#include "mongo/rpc/get_status_from_command_result.h"
#include "mongo/transport/service_entry_point.h"
#include "mongo/util/scopeguard.h"
namespace mongo {
using std::string;
using std::unique_ptr;
namespace {
class DirectClientScope {
DirectClientScope(const DirectClientScope&) = delete;
DirectClientScope& operator=(const DirectClientScope&) = delete;
public:
explicit DirectClientScope(OperationContext* opCtx)
: _opCtx(opCtx), _prev(_opCtx->getClient()->isInDirectClient()) {
_opCtx->getClient()->setInDirectClient(true);
}
~DirectClientScope() {
_opCtx->getClient()->setInDirectClient(_prev);
}
private:
OperationContext* const _opCtx;
const bool _prev;
};
} // namespace
DBDirectClient::DBDirectClient(OperationContext* opCtx) : _opCtx(opCtx) {}
void DBDirectClient::_auth(const BSONObj& params) {
uasserted(2625701, "DBDirectClient should not authenticate");
}
bool DBDirectClient::isFailed() const {
return false;
}
bool DBDirectClient::isStillConnected() {
return true;
}
std::string DBDirectClient::toString() const {
return "DBDirectClient";
}
std::string DBDirectClient::getServerAddress() const {
return "localhost"; // TODO: should this have the port?
}
// Returned version should match the incoming connections restrictions.
int DBDirectClient::getMinWireVersion() {
return WireSpec::instance().get()->incomingExternalClient.minWireVersion;
}
// Returned version should match the incoming connections restrictions.
int DBDirectClient::getMaxWireVersion() {
return WireSpec::instance().get()->incomingExternalClient.maxWireVersion;
}
bool DBDirectClient::isReplicaSetMember() const {
auto const* replCoord = repl::ReplicationCoordinator::get(_opCtx);
return replCoord && replCoord->isReplEnabled();
}
ConnectionString::ConnectionType DBDirectClient::type() const {
return ConnectionString::ConnectionType::kStandalone;
}
double DBDirectClient::getSoTimeout() const {
return 0;
}
namespace {
DbResponse loopbackBuildResponse(OperationContext* const opCtx, Message& toSend) {
DirectClientScope directClientScope(opCtx);
CurOp curOp(opCtx);
toSend.header().setId(nextMessageId());
toSend.header().setResponseToMsgId(0);
IgnoreAPIParametersBlock ignoreApiParametersBlock(opCtx);
return opCtx->getServiceContext()->getServiceEntryPoint()->handleRequest(opCtx, toSend).get();
}
} // namespace
bool DBDirectClient::call(Message& toSend, Message& response, bool assertOk, string* actualServer) {
auto dbResponse = loopbackBuildResponse(_opCtx, toSend);
invariant(!dbResponse.response.empty());
response = std::move(dbResponse.response);
return true;
}
void DBDirectClient::say(Message& toSend, bool isRetry, string* actualServer) {
auto dbResponse = loopbackBuildResponse(_opCtx, toSend);
invariant(dbResponse.response.empty());
}
std::unique_ptr<DBClientCursor> DBDirectClient::find(FindCommandRequest findRequest,
const ReadPreferenceSetting& readPref) {
invariant(!findRequest.getReadConcern(),
"passing readConcern to DBDirectClient::find() is not supported");
return DBClientBase::find(std::move(findRequest), readPref);
}
write_ops::FindAndModifyCommandReply DBDirectClient::findAndModify(
const write_ops::FindAndModifyCommandRequest& findAndModify) {
auto response = runCommand(findAndModify.serialize({}));
return FindAndModifyOp::parseResponse(response->getCommandReply());
}
write_ops::InsertCommandReply DBDirectClient::insert(
const write_ops::InsertCommandRequest& insert) {
auto response = runCommand(insert.serialize({}));
return InsertOp::parseResponse(response->getCommandReply());
}
write_ops::UpdateCommandReply DBDirectClient::update(
const write_ops::UpdateCommandRequest& update) {
auto response = runCommand(update.serialize({}));
return UpdateOp::parseResponse(response->getCommandReply());
}
write_ops::DeleteCommandReply DBDirectClient::remove(
const write_ops::DeleteCommandRequest& remove) {
auto response = runCommand(remove.serialize({}));
return DeleteOp::parseResponse(response->getCommandReply());
}
long long DBDirectClient::count(const NamespaceStringOrUUID nsOrUuid,
const BSONObj& query,
int options,
int limit,
int skip,
boost::optional<BSONObj> readConcernObj) {
invariant(!readConcernObj, "passing readConcern to DBDirectClient functions is not supported");
DirectClientScope directClientScope(_opCtx);
BSONObj cmdObj = _countCmd(nsOrUuid, query, options, limit, skip, boost::none);
auto dbName = (nsOrUuid.uuid() ? nsOrUuid.dbname() : (*nsOrUuid.nss()).db().toString());
auto result = CommandHelpers::runCommandDirectly(
_opCtx, OpMsgRequest::fromDBAndBody(dbName, std::move(cmdObj)));
uassertStatusOK(getStatusFromCommandResult(result));
return static_cast<unsigned long long>(result["n"].numberLong());
}
} // namespace mongo
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