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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::kQuery
#include "mongo/platform/basic.h"
#include "mongo/db/exec/working_set_common.h"
#include <boost/iterator/transform_iterator.hpp>
#include "mongo/bson/simple_bsonobj_comparator.h"
#include "mongo/db/catalog/collection.h"
#include "mongo/db/exec/working_set.h"
#include "mongo/db/index/index_access_method.h"
#include "mongo/db/query/canonical_query.h"
#include "mongo/db/service_context.h"
#include "mongo/db/storage/execution_context.h"
#include "mongo/logv2/log.h"
namespace mongo {
namespace {
std::string indexKeyVectorDebugString(const std::vector<IndexKeyDatum>& keyData) {
StringBuilder sb;
sb << "[";
if (keyData.size() > 0) {
auto it = keyData.begin();
sb << "(key: " << redact(it->keyData) << ", index key pattern: " << it->indexKeyPattern
<< ")";
while (++it != keyData.end()) {
sb << ", (key: " << redact(it->keyData)
<< ", index key pattern: " << it->indexKeyPattern << ")";
}
}
sb << "]";
return sb.str();
}
} // namespace
// static
bool WorkingSetCommon::fetch(OperationContext* opCtx,
WorkingSet* workingSet,
WorkingSetID id,
unowned_ptr<SeekableRecordCursor> cursor,
const NamespaceString& ns) {
WorkingSetMember* member = workingSet->get(id);
// We should have a RecordId but need to retrieve the obj. Get the obj now and reset all WSM
// state appropriately.
invariant(member->hasRecordId());
auto record = cursor->seekExact(member->recordId);
if (!record) {
// The record referenced by this index entry is gone. If the query yielded some time after
// we first examined the index entry, then it's likely that the record was deleted while we
// were yielding. However, if the snapshot id hasn't changed since the index lookup, then
// there could not have been a yield, and the only explanation is corruption.
std::vector<IndexKeyDatum>::iterator keyDataIt;
if (member->getState() == WorkingSetMember::RID_AND_IDX &&
(keyDataIt = std::find_if(member->keyData.begin(),
member->keyData.end(),
[currentSnapshotId = opCtx->recoveryUnit()->getSnapshotId()](
const auto& keyDatum) {
return keyDatum.snapshotId == currentSnapshotId;
})) != member->keyData.end()) {
auto indexKeyEntryToObjFn = [](const IndexKeyDatum& ikd) {
BSONObjBuilder builder;
builder.append("key"_sd, redact(ikd.keyData));
builder.append("pattern"_sd, ikd.indexKeyPattern);
return builder.obj();
};
LOGV2_ERROR_OPTIONS(
4615603,
{logv2::UserAssertAfterLog(ErrorCodes::DataCorruptionDetected)},
"Erroneous index key found with reference to non-existent record id "
"{recordId}: "
"{indexKeyData}. Consider dropping and then re-creating the index with key "
"pattern "
"{indexKeyPattern} and then running the validate command on the collection.",
"recordId"_attr = member->recordId,
"indexKeyData"_attr = logv2::seqLog(
boost::make_transform_iterator(member->keyData.begin(), indexKeyEntryToObjFn),
boost::make_transform_iterator(member->keyData.end(), indexKeyEntryToObjFn)),
"indexKeyPattern"_attr = keyDataIt->indexKeyPattern);
}
return false;
}
auto currentSnapshotId = opCtx->recoveryUnit()->getSnapshotId();
member->resetDocument(currentSnapshotId, record->data.releaseToBson());
// Make sure that all of the keyData is still valid for this copy of the document. This ensures
// both that index-provided filters and sort orders still hold.
//
// TODO provide a way for the query planner to opt out of this checking if it is unneeded due to
// the structure of the plan.
if (member->getState() == WorkingSetMember::RID_AND_IDX) {
auto& executionCtx = StorageExecutionContext::get(opCtx);
for (size_t i = 0; i < member->keyData.size(); i++) {
auto&& memberKey = member->keyData[i];
// If this key was obtained in the current snapshot, then move on to the next key. There
// is no way for this key to be inconsistent with the document it points to.
if (memberKey.snapshotId == currentSnapshotId) {
continue;
}
auto keys = executionCtx.keys();
// There's no need to compute the prefixes of the indexed fields that cause the
// index to be multikey when ensuring the keyData is still valid.
KeyStringSet* multikeyMetadataKeys = nullptr;
MultikeyPaths* multikeyPaths = nullptr;
auto* iam = workingSet->retrieveIndexAccessMethod(memberKey.indexId);
iam->getKeys(executionCtx.pooledBufferBuilder(),
member->doc.value().toBson(),
IndexAccessMethod::GetKeysMode::kEnforceConstraints,
IndexAccessMethod::GetKeysContext::kValidatingKeys,
keys.get(),
multikeyMetadataKeys,
multikeyPaths,
member->recordId,
IndexAccessMethod::kNoopOnSuppressedErrorFn);
KeyString::HeapBuilder keyString(iam->getSortedDataInterface()->getKeyStringVersion(),
memberKey.keyData,
iam->getSortedDataInterface()->getOrdering(),
member->recordId);
if (!keys->count(keyString.release())) {
// document would no longer be at this position in the index.
return false;
}
}
}
member->keyData.clear();
workingSet->transitionToRecordIdAndObj(id);
return true;
}
} // namespace mongo
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