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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.
*/
#pragma once
#include <set>
#include <string>
#include "mongo/db/client.h"
#include "mongo/s/write_ops/batch_write_exec.h"
namespace mongo {
/**
* Client decoration that holds information needed to by mongos to process
* getLastError commands.
*/
class ClusterLastErrorInfo {
public:
static const Client::Decoration<std::shared_ptr<ClusterLastErrorInfo>> get;
/** new request not associated (yet or ever) with a client */
void newRequest();
/**
* notes that this client use this shard
* keeps track of all shards accessed this request
*/
void addShardHost(const std::string& shardHost);
/**
* Notes that this client wrote to these particular hosts with write commands.
*/
void addHostOpTime(ConnectionString connstr, HostOpTime stat);
void addHostOpTimes(const HostOpTimeMap& hostOpTimes);
/**
* gets shards used on the previous request
*/
std::set<std::string>* getPrevShardHosts() const {
stdx::lock_guard<Latch> lock(_mutex);
return &_prev->shardHostsWritten;
}
/**
* Gets the shards, hosts, and opTimes the client last wrote to with write commands.
*/
const HostOpTimeMap& getPrevHostOpTimes() const {
stdx::lock_guard<Latch> lock(_mutex);
return _prev->hostOpTimes;
}
void disableForCommand();
private:
struct RequestInfo {
void clear() {
shardHostsWritten.clear();
hostOpTimes.clear();
}
std::set<std::string> shardHostsWritten;
HostOpTimeMap hostOpTimes;
};
// Protects _infos, _cur, and _prev.
mutable Mutex _mutex = MONGO_MAKE_LATCH("ClusterLastErrorInfo::_mutex");
// We use 2 so we can flip for getLastError type operations.
RequestInfo _infos[2];
RequestInfo* _cur = &_infos[0];
RequestInfo* _prev = &_infos[1];
};
} // namespace mongo
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