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/**
* Copyright (C) 2022-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 <functional>
#include "mongo/db/operation_context.h"
#include "mongo/db/query/collation/collator_factory_interface.h"
#include "mongo/db/views/view.h"
#include "mongo/db/views/view_graph.h"
#include "mongo/stdx/unordered_map.h"
#include "mongo/util/string_map.h"
namespace mongo {
/**
* Holds all data for the views associated with a particular database.
*/
class ViewsForDatabase {
public:
using PipelineValidatorFn = std::function<StatusWith<stdx::unordered_set<NamespaceString>>(
OperationContext*, const ViewDefinition&)>;
/**
* Usage statistics about the views associated with a single database.
* Total views = internal + userViews + userTimeseries.
*/
struct Stats {
int userViews = 0;
int userTimeseries = 0;
int internal = 0;
};
enum class Durability {
// The view is not yet inserted into the system.views collection.
kNotYetDurable,
// The view is already present in the system.views collection.
kAlreadyDurable,
};
bool valid() const {
return _valid;
}
Stats stats() const {
return _stats;
}
std::shared_ptr<const ViewDefinition> lookup(const NamespaceString& ns) const;
void iterate(const std::function<bool(const ViewDefinition& view)>& callback) const;
/**
* Reloads views from the system.views collection.
*/
Status reload(OperationContext* opCtx, const CollectionPtr& systemViews);
Status insert(OperationContext* opCtx,
const CollectionPtr& systemViews,
const NamespaceString& viewName,
const NamespaceString& viewOn,
const BSONArray& pipeline,
const PipelineValidatorFn& validatePipeline,
const BSONObj& collator,
Durability durability);
Status update(OperationContext* opCtx,
const CollectionPtr& systemViews,
const NamespaceString& viewName,
const NamespaceString& viewOn,
const BSONArray& pipeline,
const PipelineValidatorFn& validatePipeline,
std::unique_ptr<CollatorInterface> collator);
void remove(OperationContext* opCtx,
const CollectionPtr& systemViews,
const NamespaceString& ns);
void clear(OperationContext* opCtx);
private:
/**
* Inserts or updates the given view into the view map.
*/
Status _upsertIntoMap(OperationContext* opCtx, std::shared_ptr<ViewDefinition> view);
/**
* Parses the view definition pipeline, attempts to upsert into the view graph, and refreshes
* the graph if necessary. Returns an error status if the resulting graph would be invalid.
* needsValidation controls whether we check that the resulting dependency graph is acyclic and
* within the maximum depth.
*/
Status _upsertIntoGraph(OperationContext* opCtx,
const ViewDefinition& viewDef,
const PipelineValidatorFn& validatePipeline,
bool needsValidation);
/**
* Inserts or updates the given view into the system.views collection.
*/
Status _upsertIntoCatalog(OperationContext* opCtx,
const CollectionPtr& systemViews,
const ViewDefinition& view);
/**
* Returns OK if each view namespace in 'refs' has the same default collation as the given view.
* Otherwise, returns ErrorCodes::OptionNotSupportedOnView.
*/
Status _validateCollation(OperationContext* opCtx,
const ViewDefinition& view,
const std::vector<NamespaceString>& refs) const;
StringMap<std::shared_ptr<ViewDefinition>> _viewMap;
ViewGraph _viewGraph;
bool _valid = false;
bool _viewGraphNeedsRefresh = true;
Stats _stats;
};
} // namespace mongo
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