Function getExpire

app/redis-6.2.6/src/db.c:1428–1439

Return the expire time of the specified key, or -1 if no expire * is associated with this key (i.e. the key is non volatile) */

/* Return the expire time of the specified key, or -1 if no expire
 * is associated with this key (i.e. the key is non volatile) */
long long getExpire(redisDb *db, robj *key) {
    dictEntry *de;

    /* No expire? return ASAP */
    if (dictSize(db->expires) == 0 ||
       (de = dictFind(db->expires,key->ptr)) == NULL) return -1;

    /* The entry was found in the expire dict, this means it should also
     * be present in the main dict (safety check). */
    serverAssertWithInfo(NULL,key,dictFind(db->dict,key->ptr) != NULL);
    return dictGetSignedIntegerVal(de);
}

/* Delete the specified expired key and propagate expire. */
void deleteExpiredKeyAndPropagate(redisDb *db, robj *keyobj) {