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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/db/exec/working_set_common.h"
#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"
namespace mongo {
void WorkingSetCommon::prepareForSnapshotChange(WorkingSet* workingSet) {
for (auto id : workingSet->getAndClearYieldSensitiveIds()) {
if (workingSet->isFree(id)) {
continue;
}
// We may see the same member twice, so anything we do here should be idempotent.
WorkingSetMember* member = workingSet->get(id);
if (member->getState() == WorkingSetMember::RID_AND_IDX) {
member->isSuspicious = true;
}
}
}
// static
bool WorkingSetCommon::fetch(OperationContext* opCtx,
WorkingSet* workingSet,
WorkingSetID id,
unowned_ptr<SeekableRecordCursor> cursor) {
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());
member->obj.reset();
auto record = cursor->seekExact(member->recordId);
if (!record) {
return false;
}
member->obj = {opCtx->recoveryUnit()->getSnapshotId(), record->data.releaseToBson()};
if (member->isSuspicious) {
// 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.
invariant(!member->keyData.empty());
for (size_t i = 0; i < member->keyData.size(); i++) {
BSONObjSet keys = SimpleBSONObjComparator::kInstance.makeBSONObjSet();
// 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.
BSONObjSet* multikeyMetadataKeys = nullptr;
MultikeyPaths* multikeyPaths = nullptr;
member->keyData[i].index->getKeys(member->obj.value(),
IndexAccessMethod::GetKeysMode::kEnforceConstraints,
&keys,
multikeyMetadataKeys,
multikeyPaths);
if (!keys.count(member->keyData[i].keyData)) {
// document would no longer be at this position in the index.
return false;
}
}
member->isSuspicious = false;
}
member->keyData.clear();
workingSet->transitionToRecordIdAndObj(id);
return true;
}
// static
BSONObj WorkingSetCommon::buildMemberStatusObject(const Status& status) {
BSONObjBuilder bob;
bob.append("ok", status.isOK() ? 1.0 : 0.0);
bob.append("code", status.code());
bob.append("errmsg", status.reason());
if (auto extraInfo = status.extraInfo()) {
extraInfo->serialize(&bob);
}
return bob.obj();
}
// static
WorkingSetID WorkingSetCommon::allocateStatusMember(WorkingSet* ws, const Status& status) {
invariant(ws);
WorkingSetID wsid = ws->allocate();
WorkingSetMember* member = ws->get(wsid);
member->obj = Snapshotted<BSONObj>(SnapshotId(), buildMemberStatusObject(status));
member->transitionToOwnedObj();
return wsid;
}
// static
bool WorkingSetCommon::isValidStatusMemberObject(const BSONObj& obj) {
return obj.hasField("ok") && obj["code"].type() == NumberInt && obj["errmsg"].type() == String;
}
// static
void WorkingSetCommon::getStatusMemberObject(const WorkingSet& ws,
WorkingSetID wsid,
BSONObj* objOut) {
invariant(objOut);
// Validate ID and working set member.
if (WorkingSet::INVALID_ID == wsid) {
return;
}
WorkingSetMember* member = ws.get(wsid);
if (!member->hasOwnedObj()) {
return;
}
BSONObj obj = member->obj.value();
if (!isValidStatusMemberObject(obj)) {
return;
}
*objOut = obj;
}
// static
Status WorkingSetCommon::getMemberObjectStatus(const BSONObj& memberObj) {
invariant(WorkingSetCommon::isValidStatusMemberObject(memberObj));
return Status(ErrorCodes::Error(memberObj["code"].numberInt()),
memberObj["errmsg"].valueStringData(),
memberObj);
}
// static
Status WorkingSetCommon::getMemberStatus(const WorkingSetMember& member) {
invariant(member.hasObj());
return getMemberObjectStatus(member.obj.value());
}
// static
std::string WorkingSetCommon::toStatusString(const BSONObj& obj) {
if (!isValidStatusMemberObject(obj)) {
Status unknownStatus(ErrorCodes::UnknownError, "no details available");
return unknownStatus.toString();
}
return getMemberObjectStatus(obj).toString();
}
} // namespace mongo
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