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/**
* Copyright (C) 2020-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 "mongo/db/bson/dotted_path_support.h"
#include "mongo/db/exec/shard_filterer.h"
namespace mongo {
/**
* A mock that implements a constant ShardFilterer suitable for unittesting shard filtering.
*/
class ConstantFilterMock final : public ShardFilterer {
public:
ConstantFilterMock(bool pass, const BSONObj& pattern)
: _pass(pass), _pattern(pattern.getOwned()) {}
std::unique_ptr<ShardFilterer> clone() const override {
return std::make_unique<ConstantFilterMock>(_pass, _pattern.toBSON());
}
bool keyBelongsToMe(const BSONObj& key) const override {
return _pass;
}
DocumentBelongsResult documentBelongsToMe(const BSONObj& doc) const override {
return keyBelongsToMe(BSONObj{}) ? DocumentBelongsResult::kBelongs
: DocumentBelongsResult::kDoesNotBelong;
}
const KeyPattern& getKeyPattern() const override {
return _pattern;
}
bool isCollectionSharded() const override {
return true;
}
size_t getApproximateSize() const override {
auto size = sizeof(ConstantFilterMock);
size += _pattern.getApproximateSize() - sizeof(KeyPattern);
return size;
}
private:
const bool _pass;
const KeyPattern _pattern;
};
/**
* A mock ShardFilterer that filters out documents that contain nulls in all shard key fields.
*/
class AllNullShardKeyFilterMock : public ShardFilterer {
public:
explicit AllNullShardKeyFilterMock(const BSONObj& pattern) : _pattern(pattern.getOwned()) {}
std::unique_ptr<ShardFilterer> clone() const override {
return std::make_unique<AllNullShardKeyFilterMock>(_pattern.toBSON());
}
bool keyBelongsToMe(const BSONObj& key) const override {
for (auto&& elem : key) {
if (!elem.isNull()) {
return true;
}
}
return false;
}
DocumentBelongsResult documentBelongsToMe(const BSONObj& doc) const override {
auto shardKey = _pattern.extractShardKeyFromDoc(doc);
if (shardKey.isEmpty()) {
return DocumentBelongsResult::kNoShardKey;
}
return keyBelongsToMe(shardKey) ? DocumentBelongsResult::kBelongs
: DocumentBelongsResult::kDoesNotBelong;
}
const KeyPattern& getKeyPattern() const override {
return _pattern.getKeyPattern();
}
bool isCollectionSharded() const override {
return true;
}
size_t getApproximateSize() const override {
auto size = sizeof(AllNullShardKeyFilterMock);
size += _pattern.getApproximateSize() - sizeof(ShardKeyPattern);
return size;
}
private:
const ShardKeyPattern _pattern;
};
} // namespace mongo
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