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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.
*/
#pragma once
#include "mongo/base/error_codes.h"
#include "mongo/base/status_with.h"
#include "mongo/client/read_preference.h"
#include "mongo/db/operation_context.h"
#include "mongo/db/s/operation_sharding_state.h"
#include "mongo/db/service_context.h"
#include "mongo/db/shard_id.h"
#include "mongo/executor/async_rpc_targeter.h"
#include "mongo/s/grid.h"
#include "mongo/util/assert_util.h"
#include "mongo/util/assert_util_core.h"
#include "mongo/util/future.h"
#include "mongo/util/out_of_line_executor.h"
#include <memory>
#include <vector>
namespace mongo {
namespace async_rpc {
class ShardIdTargeter : public Targeter {
public:
ShardIdTargeter(ShardId shardId,
OperationContext* opCtx,
ReadPreferenceSetting readPref,
ExecutorPtr executor)
: _shardId(shardId), _opCtx(opCtx), _readPref(readPref), _executor(executor){};
SemiFuture<std::vector<HostAndPort>> resolve(CancellationToken t) override {
return getShard()
.thenRunOn(_executor)
.then([this, t](std::shared_ptr<Shard> shard) {
_shardFromLastResolve = shard;
return shard->getTargeter()->findHosts(_readPref, t);
})
.semi();
}
/**
* Update underlying shard targeter's view of topology on error.
*/
SemiFuture<void> onRemoteCommandError(HostAndPort h, Status s) override final {
invariant(_shardFromLastResolve,
"Cannot propagate a remote command error to a ShardTargeter before calling "
"resolve and obtaining a shard.");
_shardFromLastResolve->updateReplSetMonitor(h, s);
return SemiFuture<void>::makeReady();
}
SemiFuture<std::shared_ptr<Shard>> getShard() {
return Grid::get(_opCtx)->shardRegistry()->getShard(_executor, _shardId);
}
ShardId getShardId() {
return _shardId;
}
private:
ShardId _shardId;
OperationContext* _opCtx;
ReadPreferenceSetting _readPref;
ExecutorPtr _executor;
std::shared_ptr<Shard> _shardFromLastResolve;
};
} // namespace async_rpc
} // namespace mongo
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