• Ozan Tezcan's avatar
    Add listpack support, hgetf and hsetf commands (#13209) · ca4ed48d
    Ozan Tezcan authored
    **Changes:**
    - Adds listpack support to hash field expiration 
    - Implements hgetf/hsetf commands
    
    **Listpack support for hash field expiration**
    
    We keep field name and value pairs in listpack for the hash type. With
    this PR, if one of hash field expiration command is called on the key
    for the first time, it converts listpack layout to triplets to hold
    field name, value and ttl per field. If a field does not have a TTL, we
    store zero as the ttl value. Zero is encoded as two bytes in the
    listpack. So, once we convert listpack to hold triplets, for the fields
    that don't have a TTL, it will be consuming those extra 2 bytes per
    item. Fields are ordered by ttl in the listpack to find the field with
    minimum expiry time efficiently.
    
    **New command implementations as part of this PR:** 
    
    - HGETF command
    
    For each specified field get its value and optionally set the field's
    expiration time in sec/msec /unix-sec/unix-msec:
      ```
      HGETF key 
        [NX | XX | GT | LT]
    [EX seconds | PX milliseconds | EXAT unix-time-seconds | PXAT
    unix-time-milliseconds | PERSIST]
        <FIELDS count field [field ...]>
      ```
    
    - HSETF command
    
    For each specified field value pair: set field to value and optionally
    set the field's expiration time in sec/msec /unix-sec/unix-msec:
      ```
      HSETF key 
        [DC] 
        [DCF | DOF] 
        [NX | XX | GT | LT] 
        [GETNEW | GETOLD] 
    [EX seconds | PX milliseconds | EXAT unix-time-seconds | PXAT
    unix-time-milliseconds | KEEPTTL]
        <FVS count field value [field value …]>
      ```
    
    Todo:
    - Performance improvement.
    - rdb load/save
    - aof
    - defrag
    ca4ed48d
aof.c 101 KB