Function setGenericCommand

app/redis-6.2.6/src/t_string.c:75–151

#define OBJ_PERSIST (1<<8)         /* Set if we need to remove the ttl */

void setGenericCommand(client *c, int flags, robj *key, robj *val, robj *expire, int unit, robj *ok_reply, robj *abort_reply) {
    long long milliseconds = 0, when = 0; /* initialized to avoid any harmness warning */

    if (expire) {
        if (getLongLongFromObjectOrReply(c, expire, &milliseconds, NULL) != C_OK)
            return;
        if (milliseconds <= 0 || (unit == UNIT_SECONDS && milliseconds > LLONG_MAX / 1000)) {
            /* Negative value provided or multiplication is gonna overflow. */
            addReplyErrorFormat(c, "invalid expire time in %s", c->cmd->name);
            return;
        }
        if (unit == UNIT_SECONDS) milliseconds *= 1000;
        when = milliseconds;
        if ((flags & OBJ_PX) || (flags & OBJ_EX))
            when += mstime();
        if (when <= 0) {
            /* Overflow detected. */
            addReplyErrorFormat(c, "invalid expire time in %s", c->cmd->name);
            return;
        }
    }

    if ((flags & OBJ_SET_NX && lookupKeyWrite(c->db,key) != NULL) ||
        (flags & OBJ_SET_XX && lookupKeyWrite(c->db,key) == NULL))
    {
        addReply(c, abort_reply ? abort_reply : shared.null[c->resp]);
        return;
    }

    if (flags & OBJ_SET_GET) {
        if (getGenericCommand(c) == C_ERR) return;
    }

    genericSetKey(c,c->db,key, val,flags & OBJ_KEEPTTL,1);
    server.dirty++;
    notifyKeyspaceEvent(NOTIFY_STRING,"set",key,c->db->id);
    if (expire) {
        setExpire(c,c->db,key,when);
        notifyKeyspaceEvent(NOTIFY_GENERIC,"expire",key,c->db->id);

        /* Propagate as SET Key Value PXAT millisecond-timestamp if there is EXAT/PXAT or
         * propagate as SET Key Value PX millisecond if there is EX/PX flag.
         *
         * Additionally when we propagate the SET with PX (relative millisecond) we translate
         * it again to SET with PXAT for the AOF.
         *
         * Additional care is required while modifying the argument order. AOF relies on the
         * exp argument being at index 3. (see feedAppendOnlyFile)
         * */
        robj *exp = (flags & OBJ_PXAT) || (flags & OBJ_EXAT) ? shared.pxat : shared.px;
        robj *millisecondObj = createStringObjectFromLongLong(milliseconds);
        rewriteClientCommandVector(c,5,shared.set,key,val,exp,millisecondObj);
        decrRefCount(millisecondObj);
    }
    if (!(flags & OBJ_SET_GET)) {
        addReply(c, ok_reply ? ok_reply : shared.ok);
    }