/*
 * extres.c — connected extres daemons (HostRole_extres joins)
 *
 * external-license-resources Phase 1: the external-resources daemon
 * (xceesd) joins the controller with HostRole_extres and pushes
 * cluster-level (SHARED) resource values through the ordinary resval
 * update pipeline (opupd.c do_update_resvals). Mirrors the apiserver
 * join/leave registration in apiserver.c: endpoint + name only, no
 * workermgr slot — the daemon is not a schedulable host. The controller
 * never pushes TO the daemon; the daemon re-pushes its full value set on
 * every (re)connect, so nothing here needs replay/WAL treatment.
 */

#include <errno.h>
#include <stdio.h>
#include <string.h>

#include "cluster.h"
#include "xstring.h"
#include "xce/cluster_def.h"

int add_extres(cluster_t* c, char* name, endpoint_t* ep)
{
    int i;

    for (i = 0; i < N_EXTRES_MAX; i++) {
        if ((c->extresds[i].name != NULL)
            && (strcmp(c->extresds[i].name, name) == 0)) {
            /* re-join (reconnect or failover re-join): rebind in place */
            c->extresds[i].ep = ep;
            return i;
        }
    }

    for (i = 0; i < N_EXTRES_MAX; i++) {
        if (c->extresds[i].name == NULL) {
            c->extresds[i].name = makeString(name);
            if (c->extresds[i].name == NULL) {
                return -ENOMEM;
            }
            c->extresds[i].ep = ep;
            return i;
        }
    }

    ERROR("too many extres daemons (max %d); join from %s refused",
          N_EXTRES_MAX, name);
    return -ENOSPC;
}

int handle_extres_leave(cluster_t* c, endpoint_t* ep)
{
    ep_private_t* priv;
    int           i;

    if (ep == NULL) {
        return -EINVAL;
    }

    priv = (ep_private_t*)ep->data;
    if (priv == NULL) {
        return -EINVAL;
    }

    i = priv->u.idx;
    if ((i < 0) || (i >= N_EXTRES_MAX)) {
        SET_ERROR(EINVAL);
        return -errno;
    }

    /* Only clear if it is still our binding — a re-join may have rebound
     * the slot to a new endpoint before this old one's close event ran. */
    if (c->extresds[i].ep == ep) {
        c->extresds[i].ep = NULL;
    }

    return 0;
}