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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.
*/
#include "mongo/platform/basic.h"
#include "mongo/s/query/store_possible_cursor.h"
#include "mongo/base/status_with.h"
#include "mongo/bson/bsonobj.h"
#include "mongo/db/auth/authorization_session.h"
#include "mongo/db/curop.h"
#include "mongo/db/query/cursor_response.h"
#include "mongo/db/shard_id.h"
#include "mongo/executor/task_executor_pool.h"
#include "mongo/s/grid.h"
#include "mongo/s/query/cluster_client_cursor_impl.h"
#include "mongo/s/query/cluster_client_cursor_params.h"
#include "mongo/s/query/cluster_cursor_manager.h"
#include "mongo/s/transaction_router.h"
namespace mongo {
StatusWith<BSONObj> storePossibleCursor(OperationContext* opCtx,
const NamespaceString& requestedNss,
OwnedRemoteCursor&& remoteCursor,
PrivilegeVector privileges,
TailableModeEnum tailableMode) {
auto executorPool = Grid::get(opCtx)->getExecutorPool();
auto result = storePossibleCursor(
opCtx,
remoteCursor->getShardId().toString(),
remoteCursor->getHostAndPort(),
remoteCursor->getCursorResponse().toBSON(CursorResponse::ResponseType::InitialResponse),
requestedNss,
executorPool->getArbitraryExecutor(),
Grid::get(opCtx)->getCursorManager(),
std::move(privileges),
tailableMode);
// On success, release ownership of the cursor because it has been registered with the cursor
// manager and is now owned there.
remoteCursor.releaseCursor();
return result;
}
StatusWith<BSONObj> storePossibleCursor(OperationContext* opCtx,
const ShardId& shardId,
const HostAndPort& server,
const BSONObj& cmdResult,
const NamespaceString& requestedNss,
std::shared_ptr<executor::TaskExecutor> executor,
ClusterCursorManager* cursorManager,
PrivilegeVector privileges,
TailableModeEnum tailableMode,
boost::optional<BSONObj> routerSort) {
if (!cmdResult["ok"].trueValue() || !cmdResult.hasField("cursor")) {
return cmdResult;
}
auto incomingCursorResponse = CursorResponse::parseFromBSON(cmdResult);
if (!incomingCursorResponse.isOK()) {
return incomingCursorResponse.getStatus();
}
auto&& opDebug = CurOp::get(opCtx)->debug();
opDebug.additiveMetrics.nBatches = 1;
// If nShards has already been set, then we are storing the forwarding $mergeCursors cursor from
// a split aggregation pipeline, and the shards half of that pipeline may have targeted multiple
// shards. In that case, leave the current value as-is.
opDebug.nShards = std::max(opDebug.nShards, 1);
CurOp::get(opCtx)->setEndOfOpMetrics(incomingCursorResponse.getValue().getBatch().size());
if (incomingCursorResponse.getValue().getCursorId() == CursorId(0)) {
opDebug.cursorExhausted = true;
collectQueryStatsMongos(opCtx, std::move(opDebug.queryStatsRequestShapifier));
return cmdResult;
}
ClusterClientCursorParams params(incomingCursorResponse.getValue().getNSS(),
APIParameters::get(opCtx),
boost::none,
repl::ReadConcernArgs::get(opCtx));
params.remotes.emplace_back();
auto& remoteCursor = params.remotes.back();
remoteCursor.setShardId(shardId.toString());
remoteCursor.setHostAndPort(server);
remoteCursor.setCursorResponse(
CursorResponse(incomingCursorResponse.getValue().getNSS(),
incomingCursorResponse.getValue().getCursorId(),
{}, /* batch */
incomingCursorResponse.getValue().getAtClusterTime(),
incomingCursorResponse.getValue().getPostBatchResumeToken()));
params.originatingCommandObj = CurOp::get(opCtx)->opDescription().getOwned();
params.tailableMode = tailableMode;
params.lsid = opCtx->getLogicalSessionId();
params.txnNumber = opCtx->getTxnNumber();
params.originatingPrivileges = std::move(privileges);
if (routerSort) {
params.sortToApplyOnRouter = *routerSort;
}
if (TransactionRouter::get(opCtx)) {
params.isAutoCommit = false;
}
auto ccc = ClusterClientCursorImpl::make(opCtx, std::move(executor), std::move(params));
collectQueryStatsMongos(opCtx, ccc);
// We don't expect to use this cursor until a subsequent getMore, so detach from the current
// OperationContext until then.
ccc->detachFromOperationContext();
auto authUser = AuthorizationSession::get(opCtx->getClient())->getAuthenticatedUserName();
auto clusterCursorId =
cursorManager->registerCursor(opCtx,
ccc.releaseCursor(),
requestedNss,
ClusterCursorManager::CursorType::SingleTarget,
ClusterCursorManager::CursorLifetime::Mortal,
authUser);
if (!clusterCursorId.isOK()) {
return clusterCursorId.getStatus();
}
opDebug.cursorid = clusterCursorId.getValue();
CursorResponse outgoingCursorResponse(
requestedNss,
clusterCursorId.getValue(),
incomingCursorResponse.getValue().getBatch(),
incomingCursorResponse.getValue().getAtClusterTime(),
incomingCursorResponse.getValue().getPostBatchResumeToken());
return outgoingCursorResponse.toBSON(CursorResponse::ResponseType::InitialResponse);
}
} // namespace mongo
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