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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 <functional>
#include "mongo/base/string_data.h"
#include "mongo/client/replica_set_change_notifier.h"
#include "mongo/db/s/sharding_state.h"
#include "mongo/db/s/type_shard_identity.h"
namespace mongo {
class ConnectionString;
class OperationContext;
class ServiceContext;
/**
* This class serves as a bootstrap and shutdown for the sharding subsystem and also controls the
* persisted cluster identity. The default ShardingEnvironmentInitFunc instantiates all the sharding
* services, attaches them to the same service context to which it itself is attached and puts the
* ShardingState in the initialized state.
*/
class ShardingInitializationMongoD {
ShardingInitializationMongoD(const ShardingInitializationMongoD&) = delete;
ShardingInitializationMongoD& operator=(const ShardingInitializationMongoD&) = delete;
public:
using ShardingEnvironmentInitFunc = std::function<void(
OperationContext* opCtx, const ShardIdentity& shardIdentity, StringData distLockProcessId)>;
ShardingInitializationMongoD();
~ShardingInitializationMongoD();
static ShardingInitializationMongoD* get(OperationContext* opCtx);
static ShardingInitializationMongoD* get(ServiceContext* service);
void initializeShardingEnvironmentOnShardServer(OperationContext* opCtx,
const ShardIdentity& shardIdentity,
StringData distLockProcessId);
/**
* If started with --shardsvr, initializes sharding awareness from the shardIdentity document on
* disk, if there is one.
*
* If started with --shardsvr in queryableBackupMode, initializes sharding awareness from the
* shardIdentity document passed through the --overrideShardIdentity startup parameter.
*
* If it returns true, the '_initFunc' was called, meaning all the core classes for sharding
* were initialized, but no networking calls were made yet (with the exception of the duplicate
* ShardRegistry reload in ShardRegistry::startup() (see SERVER-26123). Outgoing networking
* calls to cluster members can now be made.
*
* If it returns false, this means the node is not yet sharding aware.
*
* NOTE: this function briefly takes the global lock to determine primary/secondary state.
*/
bool initializeShardingAwarenessIfNeeded(OperationContext* opCtx);
/**
* Initializes the sharding state of this server from the shard identity document argument and
* sets secondary or primary state information on the catalog cache loader.
*
* NOTE: This must be called under at least Global IX lock in order for the replica set member
* state to be stable (primary/secondary).
*/
void initializeFromShardIdentity(OperationContext* opCtx,
const ShardIdentityType& shardIdentity);
void shutDown(OperationContext* service);
/**
* Updates the config server field of the shardIdentity document with the given connection
* string.
*/
static void updateShardIdentityConfigString(OperationContext* opCtx,
const ConnectionString& newConnectionString);
/**
* For testing only. Mock the initialization method used by initializeFromConfigConnString and
* initializeFromShardIdentity after all checks are performed.
*/
void setGlobalInitMethodForTest(ShardingEnvironmentInitFunc func) {
_initFunc = std::move(func);
}
private:
// This mutex ensures that only one thread at a time executes the sharding
// initialization/teardown sequence
stdx::mutex _initSynchronizationMutex;
// Function for initializing the sharding environment components (i.e. everything on the Grid)
ShardingEnvironmentInitFunc _initFunc;
ReplicaSetChangeListenerHandle _replicaSetChangeListener;
};
/**
* Initialize the sharding components of this server. This can be used on both shard and config
* servers.
*
* NOTE: This does not initialize ShardingState, which should only be done for shard servers.
*/
void initializeGlobalShardingStateForMongoD(OperationContext* opCtx,
const ConnectionString& configCS,
StringData distLockProcessId);
} // namespace mongo
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