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// kv_catalog.h
/**
* 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 <map>
#include <memory>
#include <string>
#include "mongo/base/string_data.h"
#include "mongo/db/catalog/collection_options.h"
#include "mongo/db/record_id.h"
#include "mongo/db/storage/bson_collection_catalog_entry.h"
#include "mongo/db/storage/kv/kv_prefix.h"
#include "mongo/stdx/mutex.h"
namespace mongo {
class OperationContext;
class RecordStore;
class KVCatalog {
public:
class FeatureTracker;
/**
* @param rs - does NOT take ownership. The RecordStore must be thread-safe, in particular
* with concurrent calls to RecordStore::find, updateRecord, insertRecord, deleteRecord and
* dataFor. The KVCatalog does not utilize Cursors and those methods may omit further
* protection.
*/
KVCatalog(RecordStore* rs, bool directoryPerDb, bool directoryForIndexes);
~KVCatalog();
void init(OperationContext* opCtx);
void getAllCollections(std::vector<std::string>* out) const;
/**
* @return error or ident for instance
*/
Status newCollection(OperationContext* opCtx,
StringData ns,
const CollectionOptions& options,
KVPrefix prefix);
std::string getCollectionIdent(StringData ns) const;
std::string getIndexIdent(OperationContext* opCtx, StringData ns, StringData idName) const;
BSONCollectionCatalogEntry::MetaData getMetaData(OperationContext* opCtx, StringData ns) const;
void putMetaData(OperationContext* opCtx,
StringData ns,
BSONCollectionCatalogEntry::MetaData& md);
Status renameCollection(OperationContext* opCtx,
StringData fromNS,
StringData toNS,
bool stayTemp);
Status dropCollection(OperationContext* opCtx, StringData ns);
std::vector<std::string> getAllIdentsForDB(StringData db) const;
std::vector<std::string> getAllIdents(OperationContext* opCtx) const;
bool isUserDataIdent(StringData ident) const;
bool isCollectionIdent(StringData ident) const;
FeatureTracker* getFeatureTracker() const {
invariant(_featureTracker);
return _featureTracker.get();
}
RecordStore* getRecordStore() {
return _rs;
}
/**
* Create an entry in the catalog for an orphaned collection found in the
* storage engine. Return the generated ns of the collection.
* Note that this function does not recreate the _id index on the collection because it does not
* have access to index catalog.
*/
StatusWith<std::string> newOrphanedIdent(OperationContext* opCtx, std::string ident);
private:
class AddIdentChange;
class RemoveIdentChange;
BSONObj _findEntry(OperationContext* opCtx, StringData ns, RecordId* out = NULL) const;
/**
* Generates a new unique identifier for a new "thing".
* @param ns - the containing ns
* @param kind - what this "thing" is, likely collection or index
*/
std::string _newUniqueIdent(StringData ns, const char* kind);
// Helpers only used by constructor and init(). Don't call from elsewhere.
static std::string _newRand();
bool _hasEntryCollidingWithRand() const;
RecordStore* _rs; // not owned
const bool _directoryPerDb;
const bool _directoryForIndexes;
// These two are only used for ident generation inside _newUniqueIdent.
std::string _rand; // effectively const after init() returns
AtomicUInt64 _next;
struct Entry {
Entry() {}
Entry(std::string i, RecordId l) : ident(i), storedLoc(l) {}
std::string ident;
RecordId storedLoc;
};
typedef std::map<std::string, Entry> NSToIdentMap;
NSToIdentMap _idents;
mutable stdx::mutex _identsLock;
// Manages the feature document that may be present in the KVCatalog. '_featureTracker' is
// guaranteed to be non-null after KVCatalog::init() is called.
std::unique_ptr<FeatureTracker> _featureTracker;
};
}
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