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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::kCommand
#include "mongo/platform/basic.h"
#include "mongo/db/catalog/drop_indexes.h"
#include "mongo/db/background.h"
#include "mongo/db/catalog/index_catalog.h"
#include "mongo/db/client.h"
#include "mongo/db/concurrency/write_conflict_exception.h"
#include "mongo/db/curop.h"
#include "mongo/db/db_raii.h"
#include "mongo/db/index/index_descriptor.h"
#include "mongo/db/index_builder.h"
#include "mongo/db/op_observer.h"
#include "mongo/db/repl/replication_coordinator.h"
#include "mongo/db/service_context.h"
#include "mongo/util/log.h"
namespace mongo {
namespace {
// Field name in dropIndexes command for indexes to drop. This field can contain one of:
// 1) '*' - drop all indexes.
// 2) <index name> - name of single index to drop.
// 3) <index key pattern> - BSON document representing key pattern of index to drop.
// 4) [<index name 1>, <index name 2>, ...] - array containing names of indexes to drop.
constexpr auto kIndexFieldName = "index"_sd;
/**
* Drops single index by name.
*/
Status dropIndexByName(OperationContext* opCtx,
Collection* collection,
IndexCatalog* indexCatalog,
const std::string& indexToDelete) {
auto desc = indexCatalog->findIndexByName(opCtx, indexToDelete);
if (!desc) {
return Status(ErrorCodes::IndexNotFound,
str::stream() << "index not found with name [" << indexToDelete << "]");
}
if (desc->isIdIndex()) {
return Status(ErrorCodes::InvalidOptions, "cannot drop _id index");
}
auto s = indexCatalog->dropIndex(opCtx, desc);
if (!s.isOK()) {
return s;
}
opCtx->getServiceContext()->getOpObserver()->onDropIndex(
opCtx, collection->ns(), collection->uuid(), desc->indexName(), desc->infoObj());
return Status::OK();
}
Status wrappedRun(OperationContext* opCtx,
Collection* collection,
const BSONObj& jsobj,
BSONObjBuilder* anObjBuilder) {
IndexCatalog* indexCatalog = collection->getIndexCatalog();
anObjBuilder->appendNumber("nIndexesWas", indexCatalog->numIndexesTotal(opCtx));
BSONElement indexElem = jsobj.getField(kIndexFieldName);
if (indexElem.type() == String) {
std::string indexToDelete = indexElem.valuestr();
if (indexToDelete == "*") {
indexCatalog->dropAllIndexes(
opCtx, false, [opCtx, collection](const IndexDescriptor* desc) {
opCtx->getServiceContext()->getOpObserver()->onDropIndex(opCtx,
collection->ns(),
collection->uuid(),
desc->indexName(),
desc->infoObj());
});
anObjBuilder->append("msg", "non-_id indexes dropped for collection");
return Status::OK();
}
return dropIndexByName(opCtx, collection, indexCatalog, indexToDelete);
}
if (indexElem.type() == Object) {
std::vector<const IndexDescriptor*> indexes;
collection->getIndexCatalog()->findIndexesByKeyPattern(
opCtx, indexElem.embeddedObject(), false, &indexes);
if (indexes.empty()) {
return Status(ErrorCodes::IndexNotFound,
str::stream() << "can't find index with key: "
<< indexElem.embeddedObject());
} else if (indexes.size() > 1) {
return Status(ErrorCodes::AmbiguousIndexKeyPattern,
str::stream() << indexes.size() << " indexes found for key: "
<< indexElem.embeddedObject()
<< ", identify by name instead."
<< " Conflicting indexes: "
<< indexes[0]->infoObj()
<< ", "
<< indexes[1]->infoObj());
}
const IndexDescriptor* desc = indexes[0];
if (desc->isIdIndex()) {
return Status(ErrorCodes::InvalidOptions, "cannot drop _id index");
}
if (desc->indexName() == "*") {
// Dropping an index named '*' results in an drop-index oplog entry with a name of '*',
// which in 3.6 and later is interpreted by replication as meaning "drop all indexes on
// this collection".
return Status(ErrorCodes::InvalidOptions,
"cannot drop an index named '*' by key pattern. You must drop the "
"entire collection, drop all indexes on the collection by using an index "
"name of '*', or downgrade to 3.4 to drop only this index.");
}
Status s = indexCatalog->dropIndex(opCtx, desc);
if (!s.isOK()) {
return s;
}
opCtx->getServiceContext()->getOpObserver()->onDropIndex(
opCtx, collection->ns(), collection->uuid(), desc->indexName(), desc->infoObj());
return Status::OK();
}
// The 'index' field contains a list of names of indexes to drop.
// Drops all or none of the indexes due to the enclosing WriteUnitOfWork.
if (indexElem.type() == Array) {
for (auto indexNameElem : indexElem.Array()) {
if (indexNameElem.type() != String) {
return Status(ErrorCodes::TypeMismatch,
str::stream() << "dropIndexes " << collection->ns().ns() << " ("
<< collection->uuid()
<< ") failed to drop multiple indexes "
<< indexElem.toString(false)
<< ": index name must be a string");
}
auto indexToDelete = indexNameElem.String();
auto status = dropIndexByName(opCtx, collection, indexCatalog, indexToDelete);
if (!status.isOK()) {
return status.withContext(str::stream() << "dropIndexes " << collection->ns().ns()
<< " ("
<< collection->uuid()
<< ") failed to drop multiple indexes "
<< indexElem.toString(false)
<< ": "
<< indexToDelete);
}
}
return Status::OK();
}
return Status(ErrorCodes::IndexNotFound,
str::stream() << "invalid index name spec: " << indexElem.toString(false));
}
} // namespace
Status dropIndexes(OperationContext* opCtx,
const NamespaceString& nss,
const BSONObj& cmdObj,
BSONObjBuilder* result) {
return writeConflictRetry(opCtx, "dropIndexes", nss.db(), [opCtx, &nss, &cmdObj, result] {
AutoGetDb autoDb(opCtx, nss.db(), MODE_X);
bool userInitiatedWritesAndNotPrimary = opCtx->writesAreReplicated() &&
!repl::ReplicationCoordinator::get(opCtx)->canAcceptWritesFor(opCtx, nss);
if (userInitiatedWritesAndNotPrimary) {
return Status(ErrorCodes::NotMaster,
str::stream() << "Not primary while dropping indexes in " << nss.ns());
}
if (!serverGlobalParams.quiet.load()) {
LOG(0) << "CMD: dropIndexes " << nss << ": " << cmdObj[kIndexFieldName].toString(false);
}
// If db/collection does not exist, short circuit and return.
Database* db = autoDb.getDb();
Collection* collection = db ? db->getCollection(opCtx, nss) : nullptr;
if (!db || !collection) {
if (db && db->getViewCatalog()->lookup(opCtx, nss.ns())) {
return Status(ErrorCodes::CommandNotSupportedOnView,
str::stream() << "Cannot drop indexes on view " << nss.ns());
}
return Status(ErrorCodes::NamespaceNotFound, "ns not found");
}
WriteUnitOfWork wunit(opCtx);
OldClientContext ctx(opCtx, nss.ns());
BackgroundOperation::assertNoBgOpInProgForNs(nss);
Status status = wrappedRun(opCtx, collection, cmdObj, result);
if (!status.isOK()) {
return status;
}
wunit.commit();
return Status::OK();
});
}
} // namespace mongo
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