Function refreshGoodSlavesCount

src/replication.cpp:4496–4513

This function counts the number of slaves with lag <= min-slaves-max-lag. * If the option is active, the server will prevent writes if there are not * enough connected slaves with the specified lag (or less). */

 * If the option is active, the server will prevent writes if there are not
 * enough connected slaves with the specified lag (or less). */
void refreshGoodSlavesCount(void) {
    listIter li;
    listNode *ln;
    int good = 0;

    if (!g_pserver->repl_min_slaves_to_write ||
        !g_pserver->repl_min_slaves_max_lag) return;

    listRewind(g_pserver->slaves,&li);
    while((ln = listNext(&li))) {
        client *replica = (client*)ln->value;
        time_t lag = g_pserver->unixtime - replica->repl_ack_time;

        if (replica->replstate == SLAVE_STATE_ONLINE &&
            lag <= g_pserver->repl_min_slaves_max_lag) good++;
    }
    g_pserver->repl_good_slaves_count = good;
}

/* ----------------------- REPLICATION SCRIPT CACHE --------------------------
 * The goal of this code is to keep track of scripts already sent to every