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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 <vector>
#include "mongo/bson/bsonobj.h"
#include "mongo/db/pipeline/expression_context.h"
#include "mongo/db/pipeline/process_interface/mongo_process_interface.h"
namespace mongo {
/**
* CommonProcessInterface provides base implementations of any MongoProcessInterface methods
* whose code is largely identical on mongoD and mongoS.
*/
class CommonProcessInterface : public MongoProcessInterface {
public:
using MongoProcessInterface::MongoProcessInterface;
virtual ~CommonProcessInterface() = default;
/**
* Estimates the size of writes that will be executed on the current node. Note that this
* does not account for the full size of an update statement because in the case of local
* writes, we will not have to serialize to BSON and are therefore not subject to the 16MB
* BSONObj size limit.
*/
class LocalWriteSizeEstimator final : public WriteSizeEstimator {
public:
int estimateInsertHeaderSize(
const write_ops::InsertCommandRequest& insertReq) const override {
return 0;
}
int estimateUpdateHeaderSize(
const write_ops::UpdateCommandRequest& insertReq) const override {
return 0;
}
int estimateInsertSizeBytes(const BSONObj& insert) const override {
return insert.objsize();
}
int estimateUpdateSizeBytes(const BatchObject& batchObject,
UpsertType type) const override {
int size = std::get<write_ops::UpdateModification>(batchObject).objsize();
if (auto vars = std::get<boost::optional<BSONObj>>(batchObject)) {
size += vars->objsize();
}
return size;
}
};
/**
* Estimate the size of writes that will be sent to the replica set primary.
*/
class TargetPrimaryWriteSizeEstimator final : public WriteSizeEstimator {
public:
int estimateInsertHeaderSize(
const write_ops::InsertCommandRequest& insertReq) const override {
return write_ops::getInsertHeaderSizeEstimate(insertReq);
}
int estimateUpdateHeaderSize(
const write_ops::UpdateCommandRequest& updateReq) const override {
return write_ops::getUpdateHeaderSizeEstimate(updateReq);
}
int estimateInsertSizeBytes(const BSONObj& insert) const override {
return insert.objsize() + write_ops::kWriteCommandBSONArrayPerElementOverheadBytes;
}
int estimateUpdateSizeBytes(const BatchObject& batchObject,
UpsertType type) const override {
return getUpdateSizeEstimate(
std::get<BSONObj>(batchObject),
std::get<write_ops::UpdateModification>(batchObject),
std::get<boost::optional<BSONObj>>(batchObject),
type != UpsertType::kNone /* includeUpsertSupplied */,
boost::none /* collation */,
boost::none /* arrayFilters */,
BSONObj() /* hint*/,
boost::none /* sampleId */,
false /* $_allowShardKeyUpdatesWithoutFullShardKeyInQuery */) +
write_ops::kWriteCommandBSONArrayPerElementOverheadBytes;
}
};
/**
* Returns true if the field names of 'keyPattern' are exactly those in 'uniqueKeyPaths', and
* each of the elements of 'keyPattern' is numeric, i.e. not "text", "$**", or any other special
* type of index.
*/
static bool keyPatternNamesExactPaths(const BSONObj& keyPattern,
const std::set<FieldPath>& uniqueKeyPaths);
std::vector<BSONObj> getCurrentOps(const boost::intrusive_ptr<ExpressionContext>& expCtx,
CurrentOpConnectionsMode connMode,
CurrentOpSessionsMode sessionMode,
CurrentOpUserMode userMode,
CurrentOpTruncateMode truncateMode,
CurrentOpCursorMode cursorMode,
CurrentOpBacktraceMode backtraceMode) const final;
virtual std::vector<FieldPath> collectDocumentKeyFieldsActingAsRouter(
OperationContext*, const NamespaceString&) const override;
virtual void updateClientOperationTime(OperationContext* opCtx) const final;
boost::optional<ShardVersion> refreshAndGetCollectionVersion(
const boost::intrusive_ptr<ExpressionContext>& expCtx,
const NamespaceString& nss) const override;
std::string getHostAndPort(OperationContext* opCtx) const override;
protected:
/**
* Converts the fields from a ShardKeyPattern to a vector of FieldPaths, including the _id if
* it's not already in 'keyPatternFields'.
*/
std::vector<FieldPath> _shardKeyToDocumentKeyFields(
const std::vector<std::unique_ptr<FieldRef>>& keyPatternFields) const;
/**
* Returns a BSONObj representing a report of the operation which is currently being
* executed by the supplied client. This method is called by the getCurrentOps method of
* CommonProcessInterface to delegate to the mongoS- or mongoD- specific implementation.
*/
virtual BSONObj _reportCurrentOpForClient(const boost::intrusive_ptr<ExpressionContext>& expCtx,
Client* client,
CurrentOpTruncateMode truncateOps,
CurrentOpBacktraceMode backtraceMode) const = 0;
/**
* Iterates through all entries in the local SessionCatalog, and adds an entry to the 'ops'
* vector for each idle session that has stashed its transaction locks while sleeping.
*/
virtual void _reportCurrentOpsForIdleSessions(OperationContext* opCtx,
CurrentOpUserMode userMode,
std::vector<BSONObj>* ops) const = 0;
/**
* Report information about transaction coordinators by iterating through all
* TransactionCoordinators in the TransactionCoordinatorCatalog.
*/
virtual void _reportCurrentOpsForTransactionCoordinators(OperationContext* opCtx,
bool includeIdle,
std::vector<BSONObj>* ops) const = 0;
/**
* Reports information about PrimaryOnlyServices.
*/
virtual void _reportCurrentOpsForPrimaryOnlyServices(OperationContext* opCtx,
CurrentOpConnectionsMode connMode,
CurrentOpSessionsMode sessionMode,
std::vector<BSONObj>* ops) const = 0;
/**
* Reports information about query sampling.
*/
virtual void _reportCurrentOpsForQueryAnalysis(OperationContext* opCtx,
std::vector<BSONObj>* ops) const = 0;
};
} // namespace mongo
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