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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 "mongo/db/operation_context.h"
namespace mongo {
/**
* Diagnostic logging of sharding metadata events (changelog and actionlog).
*/
class ShardingLogging {
public:
ShardingLogging();
~ShardingLogging();
/**
* Retrieves the ShardingLogging instance associated with the current service/operation context.
*/
static ShardingLogging* get(ServiceContext* serviceContext);
static ShardingLogging* get(OperationContext* operationContext);
Status logAction(OperationContext* opCtx,
const StringData what,
const StringData ns,
const BSONObj& detail);
Status logChangeChecked(OperationContext* opCtx,
const StringData what,
const StringData ns,
const BSONObj& detail,
const WriteConcernOptions& writeConcern);
void logChange(OperationContext* const opCtx,
const StringData what,
const StringData ns,
const BSONObj& detail,
const WriteConcernOptions& writeConcern) {
// It is safe to ignore the results of `logChangeChecked` in many cases, as the
// failure to log a change is often of no consequence.
logChangeChecked(opCtx, what, ns, detail, writeConcern).ignore();
}
private:
/**
* Creates the specified collection name in the config database.
*/
Status _createCappedConfigCollection(OperationContext* opCtx,
StringData collName,
int cappedSize,
const WriteConcernOptions& writeConcern);
/**
* Best effort method, which logs diagnostic events on the config server. If the config server
* write fails for any reason a warning will be written to the local service log and the method
* will return a failed status.
*
* @param opCtx Operation context in which the call is running
* @param logCollName Which config collection to write to (excluding the database name)
* @param what E.g. "split", "migrate" (not interpreted)
* @param operationNS To which collection the metadata change is being applied (not interpreted)
* @param detail Additional info about the metadata change (not interpreted)
* @param writeConcern Write concern options to use for logging
*/
Status _log(OperationContext* opCtx,
const StringData logCollName,
const StringData what,
const StringData operationNSS,
const BSONObj& detail,
const WriteConcernOptions& writeConcern);
// Member variable properties:
// (S) Self-synchronizing; access in any way from any context.
// Whether the logAction call should attempt to create the actionlog collection
AtomicWord<int> _actionLogCollectionCreated{0}; // (S)
// Whether the logChange call should attempt to create the changelog collection
AtomicWord<int> _changeLogCollectionCreated{0}; // (S)
};
} // namespace mongo
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