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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.
*/
#define MONGO_LOGV2_DEFAULT_COMPONENT ::mongo::logv2::LogComponent::kReplication
#include "mongo/db/repl/delayable_timeout_callback.h"
#include "mongo/logv2/log.h"
namespace mongo {
namespace repl {
DelayableTimeoutCallback::~DelayableTimeoutCallback() {
cancel();
}
void DelayableTimeoutCallback::cancel() {
stdx::lock_guard lk(_mutex);
_cancel(lk);
}
void DelayableTimeoutCallback::_cancel(WithLock) {
if (_cbHandle) {
_executor->cancel(_cbHandle);
_cbHandle = executor::TaskExecutor::CallbackHandle();
_nextCall = Date_t();
}
invariant(_nextCall == Date_t());
}
Date_t DelayableTimeoutCallback::getNextCall() const {
stdx::lock_guard lk(_mutex);
return _nextCall;
}
bool DelayableTimeoutCallback::isActive() const {
return getNextCall() != Date_t();
}
Status DelayableTimeoutCallback::scheduleAt(Date_t when) {
stdx::lock_guard lk(_mutex);
return _scheduleAt(lk, when);
}
Status DelayableTimeoutCallback::_scheduleAt(WithLock lk, Date_t when) {
if (_cbHandle && when < _nextCall) {
LOGV2_DEBUG(6602300,
3,
"Moving a delayable timeout call backwards, which is inefficient",
"timerName"_attr = _timerName,
"when"_attr = when,
"nextCall"_attr = _nextCall);
_cancel(lk);
}
return _delayUntil(lk, when);
}
Status DelayableTimeoutCallback::delayUntil(Date_t when) {
stdx::lock_guard lk(_mutex);
return _delayUntil(lk, when);
}
Status DelayableTimeoutCallback::_delayUntil(WithLock lk, Date_t when) {
if (!_cbHandle) {
// No timeout is active; just schedule it
return _reschedule(lk, when);
}
if (when == _nextCall) {
LOGV2_DEBUG(6602301,
5,
"'Rescheduling' to same time",
"timerName"_attr = _timerName,
"when"_attr = when,
"nextCall"_attr = _nextCall);
}
_nextCall = when;
return Status::OK();
}
void DelayableTimeoutCallback::_handleTimeout(const executor::TaskExecutor::CallbackArgs& args) {
{
stdx::lock_guard lk(_mutex);
if (args.myHandle != _cbHandle) {
// This is normal when scheduleAt() or cancel() is used.
LOGV2_DEBUG(6602302,
5,
"DelayableTimeoutCallback::_handleTimeout got a timeout after a new handle "
"was scheduled",
"timerName"_attr = _timerName);
return;
}
Date_t now = _executor->now();
if (args.status == ErrorCodes::CallbackCanceled) {
// If args.status is CallbackCanceled yet the handles matched, that means the
// executor canceled the callback itself, probably as part of shutdown. We
// do not want to reschedule in this case, nor call the callback.
_cbHandle = executor::TaskExecutor::CallbackHandle();
_nextCall = Date_t();
return;
} else if (_nextCall > now) {
Status status = _reschedule(lk, _nextCall);
if (!status.isOK()) {
LOGV2_DEBUG(6602303,
2,
"DelayableTimeoutCallback::_handleTimeout unable to schedule",
"timerName"_attr = _timerName,
"error"_attr = status);
fassert(6602305, status == ErrorCodes::ShutdownInProgress);
}
return;
}
_cbHandle = executor::TaskExecutor::CallbackHandle();
_nextCall = Date_t();
}
_callback(args);
}
Status DelayableTimeoutCallback::_reschedule(WithLock, Date_t when) {
// We clear _cbHandle and _nextCall in advance so if scheduleWorkAt fails for any reason
// (including by exception), the invariant that _cbHandle and _nextCall are clear when no
// callback is scheduled is maintained.
_cbHandle = executor::TaskExecutor::CallbackHandle();
_nextCall = Date_t();
auto cbh = _executor->scheduleWorkAt(
when, [this](const executor::TaskExecutor::CallbackArgs& args) { _handleTimeout(args); });
if (cbh == ErrorCodes::ShutdownInProgress) {
return cbh.getStatus();
}
_nextCall = when;
_cbHandle = fassert(6602304, cbh);
return Status::OK();
}
void DelayableTimeoutCallbackWithJitter::_resetRandomization(WithLock) {
_lastRandomizationTime = Date_t();
_currentJitter = Milliseconds(0);
}
Status DelayableTimeoutCallbackWithJitter::scheduleAt(Date_t when) {
stdx::lock_guard lk(_mutex);
_resetRandomization(lk);
return _scheduleAt(lk, when);
}
Status DelayableTimeoutCallbackWithJitter::delayUntil(Date_t when) {
stdx::lock_guard lk(_mutex);
_resetRandomization(lk);
return _delayUntil(lk, when);
}
Status DelayableTimeoutCallbackWithJitter::delayUntilWithJitter(Date_t when,
Milliseconds jitterUpperBound) {
if (jitterUpperBound == Milliseconds::zero())
return delayUntil(when);
stdx::lock_guard lk(_mutex);
Date_t now = _getExecutor()->now();
Milliseconds elapsed = now - _lastRandomizationTime;
if (_lastRandomizationTime == Date_t() || elapsed < Milliseconds::zero() ||
elapsed >= jitterUpperBound || jitterUpperBound < _currentJitter) {
_lastRandomizationTime = now;
_currentJitter = Milliseconds(_randomSource(durationCount<Milliseconds>(jitterUpperBound)));
}
return _delayUntil(lk, when + _currentJitter);
}
} // namespace repl
} // namespace mongo
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