nl_tokens: private helper
pl_tokens: function fetchOffsets ( <mask> , topics , cb , when ) { if ( ! offset . ready ) { if ( when === - 1 ) { offset . once ( 'ready' , ( ) => offset . fetchLatestOffsets ( topics , cb ) ) ; } else if ( when === - 2 ) { offset . once ( 'ready' , ( ) => offset . fetchEarliestOffsets ( topics , cb ) ) ; } return ; } async . waterfall ( [ callback => { offset . client . loadMetadataForTopics ( topics , callback ) ; } , ( topicsMetaData , callback ) => { var payloads = [ ] ; var metaDatas = topicsMetaData [ 1 ] . metadata ; Object . keys ( metaDatas ) . forEach ( function ( topicName ) { var topic = metaDatas [ topicName ] ; Object . keys ( topic ) . forEach ( function ( partition ) { payloads . push ( { topic : topicName , partition : partition , time : when } ) ; } ) ; } ) ; if ( payloads . length === 0 ) { return callback ( new Error ( 'Topic(s) does not exist' ) ) ; } offset . fetch ( payloads , callback ) ; } , function ( results , callback ) { Object . keys ( results ) . forEach ( function ( topicName ) { var topic = results [ topicName ] ; Object . keys ( topic ) . forEach ( function ( partitionName ) { topic [ partitionName ] = topic [ partitionName ] [ 0 ] ; } ) ; } ) ; callback ( null , results ) ; } ] , cb ) ; }