Function RM_ZsetIncrby

app/redis-6.2.6/src/module.c:2679–2692

This function works exactly like RM_ZsetAdd(), but instead of setting * a new score, the score of the existing element is incremented, or if the * element does not already exist, it is added assuming the old score was * zero. * * The input and output flags, and the return value, have the same exact * meaning, with the only difference that this function will return * REDISMODULE_ERR even whe

 * with the new score of the element after the increment, if no error
 * is returned. */
int RM_ZsetIncrby(RedisModuleKey *key, double score, RedisModuleString *ele, int *flagsptr, double *newscore) {
    int in_flags = 0, out_flags = 0;
    if (!(key->mode & REDISMODULE_WRITE)) return REDISMODULE_ERR;
    if (key->value && key->value->type != OBJ_ZSET) return REDISMODULE_ERR;
    if (key->value == NULL) moduleCreateEmptyKey(key,REDISMODULE_KEYTYPE_ZSET);
    if (flagsptr) in_flags = moduleZsetAddFlagsToCoreFlags(*flagsptr);
    in_flags |= ZADD_IN_INCR;
    if (zsetAdd(key->value,score,ele->ptr,in_flags,&out_flags,newscore) == 0) {
        if (flagsptr) *flagsptr = 0;
        return REDISMODULE_ERR;
    }
    if (flagsptr) *flagsptr = moduleZsetAddFlagsFromCoreFlags(out_flags);
    return REDISMODULE_OK;
}

/* Remove the specified element from the sorted set.
 * The function returns REDISMODULE_OK on success, and REDISMODULE_ERR