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/**
* Copyright (C) 2016 MongoDB Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* 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
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* 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 GNU Affero General 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::kSharding
#include "mongo/platform/basic.h"
#include "mongo/s/client/shard.h"
#include "mongo/util/log.h"
namespace mongo {
namespace {
const int kOnErrorNumRetries = 3;
Status _getEffectiveCommandStatus(StatusWith<Shard::CommandResponse> cmdResponse) {
// Make sure the command even received a valid response
if (!cmdResponse.isOK()) {
return cmdResponse.getStatus();
}
// If the request reached the shard, check if the command itself failed.
if (!cmdResponse.getValue().commandStatus.isOK()) {
return cmdResponse.getValue().commandStatus;
}
// Finally check if the write concern failed
if (!cmdResponse.getValue().writeConcernStatus.isOK()) {
return cmdResponse.getValue().writeConcernStatus;
}
return Status::OK();
}
} // namespace
Shard::Shard(const ShardId& id) : _id(id) {}
const ShardId Shard::getId() const {
return _id;
}
bool Shard::isConfig() const {
return _id == "config";
}
StatusWith<Shard::CommandResponse> Shard::runCommand(OperationContext* txn,
const ReadPreferenceSetting& readPref,
const std::string& dbName,
const BSONObj& cmdObj,
RetryPolicy retryPolicy) {
for (int retry = 1; retry <= kOnErrorNumRetries; ++retry) {
auto swCmdResponse = _runCommand(txn, readPref, dbName, cmdObj);
auto commandStatus = _getEffectiveCommandStatus(swCmdResponse);
if (retry < kOnErrorNumRetries && isRetriableError(commandStatus.code(), retryPolicy)) {
LOG(3) << "Command " << cmdObj << " failed with retriable error and will be retried"
<< causedBy(commandStatus);
continue;
}
return swCmdResponse;
}
MONGO_UNREACHABLE;
}
StatusWith<Shard::QueryResponse> Shard::exhaustiveFindOnConfig(
OperationContext* txn,
const ReadPreferenceSetting& readPref,
const NamespaceString& nss,
const BSONObj& query,
const BSONObj& sort,
const boost::optional<long long> limit) {
for (int retry = 1; retry <= kOnErrorNumRetries; retry++) {
auto result = _exhaustiveFindOnConfig(txn, readPref, nss, query, sort, limit);
if (retry < kOnErrorNumRetries &&
isRetriableError(result.getStatus().code(), RetryPolicy::kIdempotent)) {
continue;
}
return result;
}
MONGO_UNREACHABLE;
}
} // namespace mongo
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