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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.
*/
#define MONGO_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kReplication
#include "mongo/platform/basic.h"
#include "mongo/db/repl/reporter.h"
#include "mongo/base/counter.h"
#include "mongo/bson/util/bson_extract.h"
#include "mongo/db/commands/server_status_metric.h"
#include "mongo/db/repl/update_position_args.h"
#include "mongo/logv2/log.h"
#include "mongo/rpc/get_status_from_command_result.h"
#include "mongo/util/assert_util.h"
#include "mongo/util/destructor_guard.h"
namespace mongo {
namespace repl {
namespace {
const char kConfigVersionFieldName[] = "configVersion";
// The number of replSetUpdatePosition commands a node sent to its sync source.
Counter64 numUpdatePosition;
ServerStatusMetricField<Counter64> displayNumUpdatePosition(
"repl.network.replSetUpdatePosition.num", &numUpdatePosition);
/**
* Returns configuration version in update command object.
* Returns -1 on failure.
*/
template <typename UpdatePositionArgsType>
long long _parseCommandRequestConfigVersion(const BSONObj& commandRequest) {
UpdatePositionArgsType args;
if (!args.initialize(commandRequest).isOK()) {
return -1;
}
if (args.updatesBegin() == args.updatesEnd()) {
return -1;
}
return args.updatesBegin()->cfgver;
}
/**
* Returns true if config version in replSetUpdatePosition response is higher than config version in
* locally generated update command request object.
* Returns false if config version is missing in either document.
*/
bool _isTargetConfigNewerThanRequest(const BSONObj& commandResult, const BSONObj& commandRequest) {
long long targetConfigVersion;
if (!bsonExtractIntegerField(commandResult, kConfigVersionFieldName, &targetConfigVersion)
.isOK()) {
return false;
}
const long long localConfigVersion =
_parseCommandRequestConfigVersion<UpdatePositionArgs>(commandRequest);
if (localConfigVersion == -1) {
return false;
}
return targetConfigVersion > localConfigVersion;
}
} // namespace
Reporter::Reporter(executor::TaskExecutor* executor,
PrepareReplSetUpdatePositionCommandFn prepareReplSetUpdatePositionCommandFn,
const HostAndPort& target,
Milliseconds keepAliveInterval,
Milliseconds updatePositionTimeout)
: _executor(executor),
_prepareReplSetUpdatePositionCommandFn(prepareReplSetUpdatePositionCommandFn),
_target(target),
_keepAliveInterval(keepAliveInterval),
_updatePositionTimeout(updatePositionTimeout) {
uassert(ErrorCodes::BadValue, "null task executor", executor);
uassert(ErrorCodes::BadValue,
"null function to create replSetUpdatePosition command object",
prepareReplSetUpdatePositionCommandFn);
uassert(ErrorCodes::BadValue, "target name cannot be empty", !target.empty());
uassert(ErrorCodes::BadValue,
"keep alive interval must be positive",
keepAliveInterval > Milliseconds(0));
uassert(ErrorCodes::BadValue,
"update position timeout must be positive",
updatePositionTimeout > Milliseconds(0));
}
Reporter::~Reporter() {
DESTRUCTOR_GUARD(shutdown(); join().transitional_ignore(););
}
std::string Reporter::toString() const {
return getTarget().toString();
}
HostAndPort Reporter::getTarget() const {
stdx::lock_guard<Latch> lk(_mutex);
return _target;
}
Milliseconds Reporter::getKeepAliveInterval() const {
stdx::lock_guard<Latch> lk(_mutex);
return _keepAliveInterval;
}
void Reporter::shutdown() {
stdx::lock_guard<Latch> lk(_mutex);
_status = Status(ErrorCodes::CallbackCanceled, "Reporter no longer valid");
if (!_isActive_inlock()) {
return;
}
_isWaitingToSendReporter = false;
executor::TaskExecutor::CallbackHandle handle;
if (_remoteCommandCallbackHandle.isValid()) {
invariant(!_prepareAndSendCommandCallbackHandle.isValid());
handle = _remoteCommandCallbackHandle;
} else {
invariant(!_remoteCommandCallbackHandle.isValid());
invariant(_prepareAndSendCommandCallbackHandle.isValid());
handle = _prepareAndSendCommandCallbackHandle;
}
_executor->cancel(handle);
}
Status Reporter::join() {
stdx::unique_lock<Latch> lk(_mutex);
_condition.wait(lk, [this]() { return !_isActive_inlock(); });
return _status;
}
Status Reporter::trigger() {
stdx::lock_guard<Latch> lk(_mutex);
// If these was a previous error then the reporter is dead and return that error.
if (!_status.isOK()) {
return _status;
}
if (_keepAliveTimeoutWhen != Date_t()) {
// Reset keep alive expiration to signal handler that it was canceled internally.
invariant(_prepareAndSendCommandCallbackHandle.isValid());
_keepAliveTimeoutWhen = Date_t();
_executor->cancel(_prepareAndSendCommandCallbackHandle);
return Status::OK();
} else if (_isActive_inlock()) {
_isWaitingToSendReporter = true;
return Status::OK();
}
auto scheduleResult =
_executor->scheduleWork([=](const executor::TaskExecutor::CallbackArgs& args) {
_prepareAndSendCommandCallback(args, true);
});
_status = scheduleResult.getStatus();
if (!_status.isOK()) {
LOGV2_DEBUG(
21585,
2,
"Reporter failed to schedule callback to prepare and send update command: {status}",
"status"_attr = _status);
return _status;
}
_prepareAndSendCommandCallbackHandle = scheduleResult.getValue();
return _status;
}
StatusWith<BSONObj> Reporter::_prepareCommand() {
auto prepareResult = _prepareReplSetUpdatePositionCommandFn();
stdx::lock_guard<Latch> lk(_mutex);
// Reporter could have been canceled while preparing the command.
if (!_status.isOK()) {
return _status;
}
// If there was an error in preparing the command, abort and return that error.
if (!prepareResult.isOK()) {
LOGV2_DEBUG(21586,
2,
"Reporter failed to prepare update command with status: {status}",
"status"_attr = prepareResult.getStatus());
_status = prepareResult.getStatus();
return _status;
}
return prepareResult.getValue();
}
void Reporter::_sendCommand_inlock(BSONObj commandRequest, Milliseconds netTimeout) {
LOGV2_DEBUG(21587,
2,
"Reporter sending oplog progress to upstream updater {target}: {commandRequest}",
"target"_attr = _target,
"commandRequest"_attr = commandRequest);
auto scheduleResult = _executor->scheduleRemoteCommand(
executor::RemoteCommandRequest(_target, "admin", commandRequest, nullptr, netTimeout),
[this](const executor::TaskExecutor::RemoteCommandCallbackArgs& rcbd) {
_processResponseCallback(rcbd);
});
_status = scheduleResult.getStatus();
if (!_status.isOK()) {
LOGV2_DEBUG(
21588, 2, "Reporter failed to schedule with status: {status}", "status"_attr = _status);
if (_status != ErrorCodes::ShutdownInProgress) {
fassert(34434, _status);
}
return;
}
numUpdatePosition.increment(1);
_remoteCommandCallbackHandle = scheduleResult.getValue();
}
void Reporter::_processResponseCallback(
const executor::TaskExecutor::RemoteCommandCallbackArgs& rcbd) {
{
stdx::lock_guard<Latch> lk(_mutex);
// If the reporter was shut down before this callback is invoked,
// return the canceled "_status".
if (!_status.isOK()) {
invariant(_status == ErrorCodes::CallbackCanceled);
_onShutdown_inlock();
return;
}
_status = rcbd.response.status;
if (!_status.isOK()) {
_onShutdown_inlock();
return;
}
// Override _status with the one embedded in the command result.
const auto& commandResult = rcbd.response.data;
_status = getStatusFromCommandResult(commandResult);
// Some error types are OK and should not cause the reporter to stop sending updates to the
// sync target.
if (_status == ErrorCodes::InvalidReplicaSetConfig &&
_isTargetConfigNewerThanRequest(commandResult, rcbd.request.cmdObj)) {
LOGV2_DEBUG(21589,
1,
"Reporter found newer configuration on sync source: {target}. Retrying.",
"target"_attr = _target);
_status = Status::OK();
// Do not resend update command immediately.
_isWaitingToSendReporter = false;
} else if (!_status.isOK()) {
_onShutdown_inlock();
return;
}
if (!_isWaitingToSendReporter) {
// Since we are also on a timer, schedule a report for that interval, or until
// triggered.
auto when = _executor->now() + _keepAliveInterval;
bool fromTrigger = false;
auto scheduleResult = _executor->scheduleWorkAt(
when, [=](const executor::TaskExecutor::CallbackArgs& args) {
_prepareAndSendCommandCallback(args, fromTrigger);
});
_status = scheduleResult.getStatus();
if (!_status.isOK()) {
_onShutdown_inlock();
return;
}
_prepareAndSendCommandCallbackHandle = scheduleResult.getValue();
_keepAliveTimeoutWhen = when;
_remoteCommandCallbackHandle = executor::TaskExecutor::CallbackHandle();
return;
}
}
// Must call without holding the lock.
auto prepareResult = _prepareCommand();
stdx::lock_guard<Latch> lk(_mutex);
if (!_status.isOK()) {
_onShutdown_inlock();
return;
}
_sendCommand_inlock(prepareResult.getValue(), _updatePositionTimeout);
if (!_status.isOK()) {
_onShutdown_inlock();
return;
}
invariant(_remoteCommandCallbackHandle.isValid());
_isWaitingToSendReporter = false;
}
void Reporter::_prepareAndSendCommandCallback(const executor::TaskExecutor::CallbackArgs& args,
bool fromTrigger) {
{
stdx::lock_guard<Latch> lk(_mutex);
if (!_status.isOK()) {
_onShutdown_inlock();
return;
}
_status = args.status;
// Ignore CallbackCanceled status if keep alive was canceled by triggered.
if (!fromTrigger && _status == ErrorCodes::CallbackCanceled &&
_keepAliveTimeoutWhen == Date_t()) {
_status = Status::OK();
}
if (!_status.isOK()) {
_onShutdown_inlock();
return;
}
}
// Must call without holding the lock.
auto prepareResult = _prepareCommand();
stdx::lock_guard<Latch> lk(_mutex);
if (!_status.isOK()) {
_onShutdown_inlock();
return;
}
_sendCommand_inlock(prepareResult.getValue(), _updatePositionTimeout);
if (!_status.isOK()) {
_onShutdown_inlock();
return;
}
invariant(_remoteCommandCallbackHandle.isValid());
_prepareAndSendCommandCallbackHandle = executor::TaskExecutor::CallbackHandle();
_keepAliveTimeoutWhen = Date_t();
}
void Reporter::_onShutdown_inlock() {
_isWaitingToSendReporter = false;
_remoteCommandCallbackHandle = executor::TaskExecutor::CallbackHandle();
_prepareAndSendCommandCallbackHandle = executor::TaskExecutor::CallbackHandle();
_keepAliveTimeoutWhen = Date_t();
_condition.notify_all();
}
bool Reporter::isActive() const {
stdx::lock_guard<Latch> lk(_mutex);
return _isActive_inlock();
}
bool Reporter::_isActive_inlock() const {
return _remoteCommandCallbackHandle.isValid() || _prepareAndSendCommandCallbackHandle.isValid();
}
bool Reporter::isWaitingToSendReport() const {
stdx::lock_guard<Latch> lk(_mutex);
return _isWaitingToSendReporter;
}
Date_t Reporter::getKeepAliveTimeoutWhen_forTest() const {
stdx::lock_guard<Latch> lk(_mutex);
return _keepAliveTimeoutWhen;
}
Status Reporter::getStatus_forTest() const {
return _status;
}
} // namespace repl
} // namespace mongo
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