C++ DBConfigPtr::getPrimary方法代码示例

//.........这里部分代码省略.........
                BSONObj dbEntry = i.next().Obj();
                const string& dbName = dbEntry["name"].String();
                if ( _isSpecialLocalDB( dbName ) ) {
                    // 'local', 'admin', and 'config' are system DBs and should be excluded here
                    continue;
                }
                else {
                    dbNames.push_back( dbName );
                }
            }

            if ( newShardConn->type() == ConnectionString::SET ) 
                rsMonitor = ReplicaSetMonitor::get( setName );

            newShardConn.done();
        }
        catch ( DBException& e ) {
            if ( servers.type() == ConnectionString::SET ) {
                ReplicaSetMonitor::remove( servers.getSetName() );
            }
            ostringstream ss;
            ss << "couldn't connect to new shard ";
            ss << e.what();
            errMsg = ss.str();
            return false;
        }

        // check that none of the existing shard candidate's db's exist elsewhere
        for ( vector<string>::const_iterator it = dbNames.begin(); it != dbNames.end(); ++it ) {
            DBConfigPtr config = getDBConfig( *it , false );
            if ( config.get() != NULL ) {
                ostringstream ss;
                ss << "can't add shard " << servers.toString() << " because a local database '" << *it;
                ss << "' exists in another " << config->getPrimary().toString();
                errMsg = ss.str();
                return false;
            }
        }

        // if a name for a shard wasn't provided, pick one.
        if ( name->empty() && ! _getNewShardName( name ) ) {
            errMsg = "error generating new shard name";
            return false;
        }

        // build the ConfigDB shard document
        BSONObjBuilder b;
        b.append(ShardType::name(), *name);
        b.append(ShardType::host(),
                 rsMonitor ? rsMonitor->getServerAddress() : servers.toString());
        if (maxSize > 0) {
            b.append(ShardType::maxSize(), maxSize);
        }
        BSONObj shardDoc = b.obj();

        {
            ScopedDbConnection conn(configServer.getPrimary().getConnString(), 30);

            // check whether the set of hosts (or single host) is not an already a known shard
            BSONObj old = conn->findOne(ShardType::ConfigNS,
                                        BSON(ShardType::host(servers.toString())));

            if ( ! old.isEmpty() ) {
                errMsg = "host already used";
                conn.done();
                return false;

    bool Grid::addShard( string* name , const ConnectionString& servers , long long maxSize , string& errMsg ) {
        // name can be NULL, so provide a dummy one here to avoid testing it elsewhere
        string nameInternal;
        if ( ! name ) {
            name = &nameInternal;
        }

        ReplicaSetMonitorPtr rsMonitor;

        // Check whether the host (or set) exists and run several sanity checks on this request.
        // There are two set of sanity checks: making sure adding this particular shard is consistent
        // with the replica set state (if it exists) and making sure this shards databases can be
        // brought into the grid without conflict.

        if ( servers.type() == ConnectionString::SYNC ) {
            errMsg = "can't use sync cluster as a shard for replica set, "
                    "have to use <setname>/<server1>,<server2>,...";
            return false;
        }

        vector<string> dbNames;
        try {
            bool ok = false;

            {
                ScopedDbConnection newShardConn(servers.toString());

                BSONObj resIsMongos;
                ok = newShardConn->runCommand( "admin", BSON( "isdbgrid" << 1 ), resIsMongos );
                newShardConn.done();
            }

            // should return ok=0, cmd not found if it's a normal mongod
            if ( ok ) {
                errMsg = "can't add a mongos process as a shard";
                return false;
            }

            if ( servers.type() == ConnectionString::SET ) {
                if (!addReplSetShardCheck( servers, &errMsg )) {
                    return false;
                }

                // shard name defaults to the name of the replica set
                if ( name->empty() && !servers.getSetName().empty() ) {
                    *name = servers.getSetName();
                }
            }

            // In order to be accepted as a new shard, that mongod must not have any database name
            // that exists already in any other shards. If that test passes, the new shard's
            // databases are going to be entered as non-sharded db's whose primary is the
            // newly added shard.

            BSONObj resListDB;
            {
                ScopedDbConnection newShardConn(servers.toString());
                ok = newShardConn->runCommand( "admin", BSON( "listDatabases" << 1 ), resListDB );
                newShardConn.done();
            }

            if ( !ok ) {
                errMsg = str::stream() << "failed listing " << servers.toString()
                            << "'s databases:" << resListDB;;
                return false;
            }

            BSONObjIterator i( resListDB["databases"].Obj() );
            while ( i.more() ) {
                BSONObj dbEntry = i.next().Obj();
                const string& dbName = dbEntry["name"].String();
                if ( _isSpecialLocalDB( dbName ) ) {
                    // 'local', 'admin', and 'config' are system DBs and should be excluded here
                    continue;
                }
                else {
                    dbNames.push_back( dbName );
                }
            }

            if ( servers.type() == ConnectionString::SET ) {
                rsMonitor = ReplicaSetMonitor::get( servers.getSetName() );
            }
        }
        catch ( DBException& e ) {
            if ( servers.type() == ConnectionString::SET ) {
                ReplicaSetMonitor::remove( servers.getSetName() );
            }

            errMsg = str::stream() << "couldn't connect to new shard " << causedBy(e);
            return false;
        }

        // check that none of the existing shard candidate's db's exist elsewhere
        for ( vector<string>::const_iterator it = dbNames.begin(); it != dbNames.end(); ++it ) {
            DBConfigPtr config = getDBConfig( *it , false );
            if ( config.get() != NULL ) {
                ostringstream ss;
                ss << "can't add shard " << servers.toString() << " because a local database '" << *it;
                ss << "' exists in another " << config->getPrimary().toString();
//.........这里部分代码省略.........