Interface for our redis buffer

Buffer

class Buffer {
    push(store, record){
        in a single transaction
            add record to buffer - RPUSH
            if this is first write into this store then save timestamp - SETNX
            extract keys from the object and add them to set - SADD
            increment size of the data in buffer - INCRBY
            get size, number of records, unique keys - GET, LLEN, SMEMBERS
            get timestamp of frist write - GET
        return size, count, keys and timestamp
    }
    prepareToPersist(store){
        get current timestamp
        in a single transaction
            prepend all store keys with the timestamp - RENAMENX
            remove lock if it exists - DEL
            get buffer contents and unique keys - LRANGE, SMEMBERS
        return timestamp, data and keys
    }
    getContents(store, timestamp?){
        if timestamp is provided then prepend it to all keys
        in a single pipeline
            get buffer contents and unique keys - LRANGE, SMEMBERS
        return data and keys
    }
    empty(store, timestamp?){
        if timestamp is provided then prepend it to all keys
        in a single operation remove all keys for this store - DEL
    }
    lock(duration, store, timestamp?){
        if timestamp is provided then prepend it to lock key
        attempt to get value of lock key - GET
        if it exists return false to signal that lock failed
        in a single transation
            attempt to get value of preexisting key - GET
            create key with expiration set to provided duration - SETEX
        if the GET operation returned value then 
            return false to signal that lock operation failed
        else 
            return true to signal that lock was successful
    }
    getOld(){
        get all ids of stores in buffer - KEYS
        get timestamps of first write operations - GET
        return list of stores with timestamps
    }
    getPrepared(){
        get all stores in buffer with keys prepended with timestamp - KEYS
        return list of stores with persist operation timestamps
    }
}