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/**
* Copyright (C) 2019-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/commands/document_shard_key_update_util.h"
#include "mongo/base/status_with.h"
#include "mongo/db/namespace_string.h"
#include "mongo/s/would_change_owning_shard_exception.h"
#include "mongo/s/write_ops/batched_command_request.h"
#include "mongo/s/write_ops/batched_command_response.h"
#include "mongo/s/write_ops/cluster_write.h"
#include "mongo/util/log.h"
#include "mongo/util/str.h"
namespace mongo {
namespace {
/**
* Calls into the command execution stack to run the given command. Will blindly uassert on any
* error returned by a command.
*/
bool executeOperationsAsPartOfShardKeyUpdate(OperationContext* opCtx,
const BSONObj& deleteCmdObj,
const BSONObj& insertCmdObj,
const StringData db) {
auto deleteOpMsg = OpMsgRequest::fromDBAndBody(db, deleteCmdObj);
auto deleteRequest = BatchedCommandRequest::parseDelete(deleteOpMsg);
BatchedCommandResponse deleteResponse;
BatchWriteExecStats deleteStats;
ClusterWriter::write(opCtx, deleteRequest, &deleteStats, &deleteResponse);
uassertStatusOK(deleteResponse.toStatus());
// If we do not delete any document, this is essentially equivalent to not matching a doc.
if (deleteResponse.getN() != 1)
return false;
auto insertOpMsg = OpMsgRequest::fromDBAndBody(db, insertCmdObj);
auto insertRequest = BatchedCommandRequest::parseInsert(insertOpMsg);
BatchedCommandResponse insertResponse;
BatchWriteExecStats insertStats;
ClusterWriter::write(opCtx, insertRequest, &insertStats, &insertResponse);
uassertStatusOK(insertResponse.toStatus());
uassert(ErrorCodes::NamespaceNotFound,
"Document not successfully inserted while changing shard key for namespace " +
insertRequest.getNS().toString(),
insertResponse.getN() == 1);
return true;
}
/**
* Creates the delete op that will be used to delete the pre-image document. Will also attach the
* original document _id retrieved from 'updatePreImage'.
*/
write_ops::Delete createShardKeyDeleteOp(const NamespaceString& nss,
const BSONObj& updatePreImage) {
write_ops::Delete deleteOp(nss);
deleteOp.setDeletes({[&] {
write_ops::DeleteOpEntry entry;
entry.setQ(updatePreImage);
entry.setMulti(false);
return entry;
}()});
return deleteOp;
}
/**
* Creates the insert op that will be used to insert the new document with the post-update image.
*/
write_ops::Insert createShardKeyInsertOp(const NamespaceString& nss,
const BSONObj& updatePostImage) {
write_ops::Insert insertOp(nss);
insertOp.setDocuments({updatePostImage});
return insertOp;
}
} // namespace
namespace documentShardKeyUpdateUtil {
bool updateShardKeyForDocument(OperationContext* opCtx,
const NamespaceString& nss,
const WouldChangeOwningShardInfo& documentKeyChangeInfo,
int stmtId) {
auto updatePreImage = documentKeyChangeInfo.getPreImage().getOwned();
invariant(documentKeyChangeInfo.getPostImage());
auto updatePostImage = documentKeyChangeInfo.getPostImage()->getOwned();
auto deleteCmdObj = constructShardKeyDeleteCmdObj(nss, updatePreImage, stmtId);
auto insertCmdObj = constructShardKeyInsertCmdObj(nss, updatePostImage, stmtId);
return executeOperationsAsPartOfShardKeyUpdate(opCtx, deleteCmdObj, insertCmdObj, nss.db());
}
TransactionRouter* startTransactionForShardKeyUpdate(OperationContext* opCtx) {
auto txnRouter = TransactionRouter::get(opCtx);
invariant(txnRouter);
auto txnNumber = opCtx->getTxnNumber();
invariant(txnNumber);
txnRouter->beginOrContinueTxn(opCtx, *txnNumber, TransactionRouter::TransactionActions::kStart);
return txnRouter;
}
void commitShardKeyUpdateTransaction(OperationContext* opCtx, TransactionRouter* txnRouter) {
auto commitResponse = txnRouter->commitTransaction(opCtx, boost::none);
}
BSONObj constructShardKeyDeleteCmdObj(const NamespaceString& nss,
const BSONObj& updatePreImage,
int stmtId) {
auto deleteOp = createShardKeyDeleteOp(nss, updatePreImage);
// TODO SERVER-40181: Do not set the stmtId once we remove stmtIds from txn oplog entries
deleteOp.getWriteCommandBase().setStmtId(stmtId);
return deleteOp.toBSON({});
}
BSONObj constructShardKeyInsertCmdObj(const NamespaceString& nss,
const BSONObj& updatePostImage,
int stmtId) {
auto insertOp = createShardKeyInsertOp(nss, updatePostImage);
// TODO SERVER-40181: Do not set the stmtId once we remove stmtIds from txn oplog entries
insertOp.getWriteCommandBase().setStmtId(stmtId);
return insertOp.toBSON({});
}
} // namespace documentShardKeyUpdateUtil
} // namespace mongo
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