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/**
* Copyright (C) 2019-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 <mutex>
#include "mongo/base/status.h"
#include "mongo/base/string_data.h"
#include "mongo/db/server_options.h"
#include "mongo/platform/mutex.h"
#include "mongo/util/clock_source.h"
namespace mongo {
namespace repl {
class InitialSyncSharedData {
public:
InitialSyncSharedData(ServerGlobalParams::FeatureCompatibility::Version FCV, int rollBackId)
: _FCV(FCV), _rollBackId(rollBackId) {}
ServerGlobalParams::FeatureCompatibility::Version getFCV() const {
return _FCV;
}
int getRollBackId() const {
return _rollBackId;
}
/**
* In all cases below, the lock must be a lock on this object itself for access to be valid.
*/
Status getInitialSyncStatus(WithLock lk) {
return _initialSyncStatus;
}
void setInitialSyncStatus(WithLock lk, Status newStatus) {
_initialSyncStatus = newStatus;
}
/**
* Sets the initialSyncStatus to the new status if and only if the old status is "OK".
*/
void setInitialSyncStatusIfOK(WithLock lk, Status newStatus) {
if (_initialSyncStatus.isOK())
_initialSyncStatus = newStatus;
}
int getRetryingOperationsCount(WithLock lk) {
return _retryingOperationsCount;
}
int totalRetries(WithLock lk) {
return _totalRetries;
}
/**
* Increment the number of retrying operations, set syncSourceUnreachableSince if this is the
* only retrying operation. This should be used when an operation starts retrying.
*
* Returns the new number of retrying operations.
*/
int incrementRetryingOperations(WithLock lk, ClockSource* clock);
/**
* Decrement the number of retrying operations. If now zero, clear syncSourceUnreachableSince
* and update _totalTimeUnreachable.
* Returns the new number of retrying operations.
*/
int decrementRetryingOperations(WithLock lk, ClockSource* clock);
void incrementTotalRetries(WithLock lk) {
_totalRetries++;
}
/**
* Returns the total time the sync source has been unreachable, including any current outage.
*/
Milliseconds getTotalTimeUnreachable(WithLock lk, ClockSource* clock);
/**
* Returns the total time the sync source has been unreachable in the current outage.
* Returns Milliseconds::min() if there is no current outage.
*/
Milliseconds getCurrentOutageDuration(WithLock lk, ClockSource* clock);
/**
* BasicLockable C++ methods; they merely delegate to the mutex.
* The presence of these methods means we can use stdx::unique_lock<InitialSyncSharedData> and
* stdx::lock_guard<InitialSyncSharedData>.
*/
void lock() {
_mutex.lock();
}
void unlock() {
_mutex.unlock();
}
private:
// The const members above the mutex may be accessed without the mutex.
// Sync source FCV at start of initial sync.
const ServerGlobalParams::FeatureCompatibility::Version _FCV;
// Rollback ID at start of initial sync
const int _rollBackId;
// This mutex controls access to all members below it.
mutable Mutex _mutex = MONGO_MAKE_LATCH("InitialSyncSharedData::_mutex"_sd);
// Status of the entire initial sync. All initial sync tasks should exit if this becomes
// non-OK.
Status _initialSyncStatus = Status::OK();
// Number of operations currently being retried due to a transient error.
int _retryingOperationsCount = 0;
// Number of total retry attempts for all operations. Does not include initial attempts,
// so should normally be 0.
int _totalRetries = 0;
// If any operation is currently retrying, the earliest time at which any operation detected
// a transient network error. Otherwise is Date_t().
Date_t _syncSourceUnreachableSince;
// The total time across all outages in this initial sync attempt, but excluding any current
// outage, that we were retrying because we were unable to reach the sync source.
Milliseconds _totalTimeUnreachable;
};
} // namespace repl
} // namespace mongo
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