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/**
* Copyright (C) 2020-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.
*/
#include "mongo/client/streamable_replica_set_monitor_error_handler.h"
#include "mongo/logv2/log.h"
#define MONGO_LOGV2_DEFAULT_COMPONENT ::mongo::logv2::LogComponent::kNetwork
namespace mongo {
SdamErrorHandler::ErrorActions SdamErrorHandler::computeErrorActions(const HostAndPort& host,
const Status& status,
HandshakeStage handshakeStage,
bool isApplicationOperation,
BSONObj bson) noexcept {
// Initial state: don't drop connections, no immediate check, and don't generate an error server
// description.
ErrorActions result;
ON_BLOCK_EXIT([this, &result, &host, &status] {
if (result.helloOutcome)
_clearConsecutiveErrorsWithoutHelloOutcome(host);
LOGV2(4712102,
"Host failed in replica set",
"replicaSet"_attr = _setName,
"host"_attr = host,
"error"_attr = status,
"action"_attr = result);
});
// Helpers to mutate the actions
const auto setCreateServerDescriptionAction = [this, &result, &host, &status, bson]() {
result.helloOutcome = _createErrorHelloOutcome(host, bson, status);
};
const auto setImmediateCheckAction = [&result]() { result.requestImmediateCheck = true; };
const auto setDropConnectionsAction = [&result]() { result.dropConnections = true; };
if (!_isNetworkError(status) && !_isNotMasterOrNodeRecovering(status)) {
setCreateServerDescriptionAction();
return result;
}
if (isApplicationOperation) {
if (_isNetworkError(status)) {
switch (handshakeStage) {
case HandshakeStage::kPreHandshake:
setCreateServerDescriptionAction();
break;
case HandshakeStage::kPostHandshake:
if (!_isNetworkTimeout(status)) {
setCreateServerDescriptionAction();
}
break;
}
setDropConnectionsAction();
} else if (_isNotMasterOrNodeRecovering(status)) {
setCreateServerDescriptionAction();
setImmediateCheckAction();
if (_isNodeShuttingDown(status)) {
setDropConnectionsAction();
}
}
} else if (_isNetworkError(status)) {
switch (handshakeStage) {
case HandshakeStage::kPreHandshake:
setCreateServerDescriptionAction();
break;
case HandshakeStage::kPostHandshake:
int errorCount = _getConsecutiveErrorsWithoutHelloOutcome(host);
if (errorCount == 1) {
setCreateServerDescriptionAction();
} else {
setImmediateCheckAction();
_incrementConsecutiveErrorsWithoutHelloOutcome(host);
}
break;
}
setDropConnectionsAction();
}
return result;
}
BSONObj StreamableReplicaSetMonitorErrorHandler::ErrorActions::toBSON() const {
BSONObjBuilder builder;
builder.append("dropConnections", dropConnections);
builder.append("requestImmediateCheck", requestImmediateCheck);
if (helloOutcome) {
builder.append("outcome", helloOutcome->toBSON());
}
return builder.obj();
}
bool SdamErrorHandler::_isNodeRecovering(const Status& status) const {
return ErrorCodes::isA<ErrorCategory::RetriableError>(status.code());
}
bool SdamErrorHandler::_isNetworkTimeout(const Status& status) const {
return ErrorCodes::isA<ErrorCategory::NetworkTimeoutError>(status.code());
}
bool SdamErrorHandler::_isNodeShuttingDown(const Status& status) const {
return ErrorCodes::isA<ErrorCategory::ShutdownError>(status.code());
}
bool SdamErrorHandler::_isNetworkError(const Status& status) const {
return ErrorCodes::isA<ErrorCategory::NetworkError>(status.code());
}
bool SdamErrorHandler::_isNotMasterOrNodeRecovering(const Status& status) const {
return _isNodeRecovering(status) || _isNotMaster(status);
}
bool SdamErrorHandler::_isNotMaster(const Status& status) const {
return ErrorCodes::isA<ErrorCategory::NotPrimaryError>(status.code());
}
int SdamErrorHandler::_getConsecutiveErrorsWithoutHelloOutcome(const HostAndPort& host) const {
stdx::lock_guard lock(_mutex);
if (auto it = _consecutiveErrorsWithoutHelloOutcome.find(host);
it != _consecutiveErrorsWithoutHelloOutcome.end()) {
return it->second;
}
return 0;
}
void SdamErrorHandler::_incrementConsecutiveErrorsWithoutHelloOutcome(const HostAndPort& host) {
stdx::lock_guard lock(_mutex);
auto [iter, wasEmplaced] = _consecutiveErrorsWithoutHelloOutcome.emplace(host, 1);
if (!wasEmplaced) {
++(iter->second);
}
}
void SdamErrorHandler::_clearConsecutiveErrorsWithoutHelloOutcome(const HostAndPort& host) {
stdx::lock_guard lock(_mutex);
_consecutiveErrorsWithoutHelloOutcome.erase(host);
}
} // namespace mongo
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