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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.
*/
#pragma once
#include <boost/optional.hpp>
#include <string>
#include "mongo/bson/bsonobj.h"
#include "mongo/bson/simple_bsonobj_comparator.h"
#include "mongo/db/query/canonical_query.h"
#include "mongo/db/query/index_entry.h"
#include "mongo/db/query/plan_cache.h"
#include "mongo/platform/mutex.h"
#include "mongo/stdx/unordered_map.h"
namespace mongo {
/**
* Filter indicating whether an index entry is in the set of allowed indices.
*/
class AllowedIndicesFilter {
private:
AllowedIndicesFilter(const AllowedIndicesFilter&) = delete;
AllowedIndicesFilter& operator=(const AllowedIndicesFilter&) = delete;
public:
AllowedIndicesFilter(const BSONObjSet& indexKeyPatterns,
const stdx::unordered_set<std::string>& indexNames);
AllowedIndicesFilter(AllowedIndicesFilter&& other) = default;
AllowedIndicesFilter& operator=(AllowedIndicesFilter&& other) = default;
/**
* Returns true if entry is allowed by the filter either because it has a matching key pattern
* or index name, and returns false otherwise.
*/
bool allows(const IndexEntry& entry) const {
return indexKeyPatterns.find(entry.keyPattern) != indexKeyPatterns.end() ||
indexNames.find(entry.identifier.catalogName) != indexNames.end();
}
// These are the index key patterns and names that
// we will use to override the indexes retrieved from
// the index catalog.
BSONObjSet indexKeyPatterns;
stdx::unordered_set<std::string> indexNames;
};
/**
* Value type for query settings.
* Holds:
* query shape (query, sort, projection, collation)
* unordered_set of index specs
*/
class AllowedIndexEntry {
public:
AllowedIndexEntry(const BSONObj& query,
const BSONObj& sort,
const BSONObj& projection,
const BSONObj& collation,
const BSONObjSet& indexKeyPatterns,
const stdx::unordered_set<std::string>& indexNames);
// query, sort, projection, and collation collectively represent the query shape that we are
// storing hint overrides for.
BSONObj query;
BSONObj sort;
BSONObj projection;
BSONObj collation;
// These are the index key patterns and names that
// we will use to override the indexes retrieved from
// the index catalog.
BSONObjSet indexKeyPatterns;
stdx::unordered_set<std::string> indexNames;
};
/**
* Holds the index filters in a collection.
*/
class QuerySettings {
private:
QuerySettings(const QuerySettings&) = delete;
QuerySettings& operator=(const QuerySettings&) = delete;
public:
QuerySettings() = default;
/**
* Returns AllowedIndicesFilter for the query if it is set in the query settings, or
* boost::none if it isn't.
*/
boost::optional<AllowedIndicesFilter> getAllowedIndicesFilter(
const CanonicalQuery::PlanCacheCommandKey& key) const;
/**
* Returns copies of all overrides for the collection.
*/
std::vector<AllowedIndexEntry> getAllAllowedIndices() const;
/**
* Adds or replaces entry in query settings.
* If existing entry is found for the same key, replaces it.
*/
void setAllowedIndices(const CanonicalQuery& canonicalQuery,
const BSONObjSet& indexKeyPatterns,
const stdx::unordered_set<std::string>& indexNames);
/**
* Removes single entry from query settings. No effect if query shape is not found.
*/
void removeAllowedIndices(const CanonicalQuery::PlanCacheCommandKey& key);
/**
* Clears all allowed indices from query settings.
*/
void clearAllowedIndices();
private:
// Allowed index entries owned here.
using AllowedIndexEntryMap =
stdx::unordered_map<CanonicalQuery::PlanCacheCommandKey, AllowedIndexEntry>;
AllowedIndexEntryMap _allowedIndexEntryMap;
/**
* Protects data in query settings.
*/
mutable Mutex _mutex = MONGO_MAKE_LATCH("QuerySettings::_mutex");
};
} // namespace mongo
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