Function RM_ValueLength

app/redis-6.2.6/src/module.c:2318–2329

Return the length of the value associated with the key. * For strings this is the length of the string. For all the other types * is the number of elements (just counting keys for hashes). * * If the key pointer is NULL or the key is empty, zero is returned. */

 *
 * If the key pointer is NULL or the key is empty, zero is returned. */
size_t RM_ValueLength(RedisModuleKey *key) {
    if (key == NULL || key->value == NULL) return 0;
    switch(key->value->type) {
    case OBJ_STRING: return stringObjectLen(key->value);
    case OBJ_LIST: return listTypeLength(key->value);
    case OBJ_SET: return setTypeSize(key->value);
    case OBJ_ZSET: return zsetLength(key->value);
    case OBJ_HASH: return hashTypeLength(key->value);
    case OBJ_STREAM: return streamLength(key->value);
    default: return 0;
    }
}

/* If the key is open for writing, remove it, and setup the key to
 * accept new writes as an empty key (that will be created on demand).