Function hashTypeGetValue

src/t_hash.cpp:115–131

Higher level function of hashTypeGet*() that returns the hash value * associated with the specified field. If the field is found C_OK * is returned, otherwise C_ERR. The returned object is returned by * reference in either *vstr and *vlen if it's returned in string form, * or stored in *vll if it's returned as a number. * * If *vll is populated *vstr is set to NULL, so the caller * can alwa

 * can always check the function return by checking the return value
 * for C_OK and checking if vll (or vstr) is NULL. */
int hashTypeGetValue(robj_roptr o, sds field, const unsigned char **vstr, unsigned int *vlen, long long *vll) {
    if (o->encoding == OBJ_ENCODING_ZIPLIST) {
        *vstr = NULL;
        if (hashTypeGetFromZiplist(o, field, vstr, vlen, vll) == 0)
            return C_OK;
    } else if (o->encoding == OBJ_ENCODING_HT) {
        const char *value;
        if ((value = hashTypeGetFromHashTable(o, field)) != NULL) {
            *vstr = (const unsigned char*) value;
            *vlen = sdslen(value);
            return C_OK;
        }
    } else {
        serverPanic("Unknown hash encoding");
    }
    return C_ERR;
}

/* Like hashTypeGetValue() but returns a Redis object, which is useful for
 * interaction with the hash type outside t_hash.c.