/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 2010 Pawel Jakub Dawidek <pjd@FreeBSD.org>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/cdefs.h>
#include <errno.h>

#include "hast.h"
#include "hast_proto.h"
#include "hooks.h"
#include "nv.h"
#include "pjdlog.h"
#include "proto.h"
#include "subr.h"

#include "event.h"

void
event_send(const struct hast_resource *res, int event)
{
        struct nv *nvin, *nvout;
        int error;

        PJDLOG_ASSERT(res != NULL);
        PJDLOG_ASSERT(event >= EVENT_MIN && event <= EVENT_MAX);

        nvin = nvout = NULL;

        /*
         * Prepare and send event to parent process.
         */
        nvout = nv_alloc();
        nv_add_uint8(nvout, (uint8_t)event, "event");
        error = nv_error(nvout);
        if (error != 0) {
                pjdlog_common(LOG_ERR, 0, error,
                    "Unable to prepare event header");
                goto done;
        }
        if (hast_proto_send(res, res->hr_event, nvout, NULL, 0) == -1) {
                pjdlog_errno(LOG_ERR, "Unable to send event header");
                goto done;
        }
        if (hast_proto_recv_hdr(res->hr_event, &nvin) == -1) {
                pjdlog_errno(LOG_ERR, "Unable to receive event header");
                goto done;
        }
        /*
         * Do nothing with the answer. We only wait for it to be sure not
         * to exit too quickly after sending an event and exiting immediately.
         */
done:
        if (nvin != NULL)
                nv_free(nvin);
        if (nvout != NULL)
                nv_free(nvout);
}

int
event_recv(const struct hast_resource *res)
{
        struct nv *nvin, *nvout;
        const char *evstr;
        uint8_t event;
        int error;

        PJDLOG_ASSERT(res != NULL);

        nvin = nvout = NULL;

        if (hast_proto_recv_hdr(res->hr_event, &nvin) == -1) {
                /*
                 * First error log as debug. This is because worker process
                 * most likely exited.
                 */
                pjdlog_common(LOG_DEBUG, 1, errno,
                    "Unable to receive event header");
                goto fail;
        }

        event = nv_get_uint8(nvin, "event");
        if (event == EVENT_NONE) {
                pjdlog_error("Event header is missing 'event' field.");
                goto fail;
        }

        switch (event) {
        case EVENT_CONNECT:
                evstr = "connect";
                break;
        case EVENT_DISCONNECT:
                evstr = "disconnect";
                break;
        case EVENT_SYNCSTART:
                evstr = "syncstart";
                break;
        case EVENT_SYNCDONE:
                evstr = "syncdone";
                break;
        case EVENT_SYNCINTR:
                evstr = "syncintr";
                break;
        case EVENT_SPLITBRAIN:
                evstr = "split-brain";
                break;
        default:
                pjdlog_error("Event header contain invalid event number (%hhu).",
                    event);
                goto fail;
        }

        pjdlog_prefix_set("[%s] (%s) ", res->hr_name, role2str(res->hr_role));
        hook_exec(res->hr_exec, evstr, res->hr_name, NULL);
        pjdlog_prefix_set("%s", "");

        nvout = nv_alloc();
        nv_add_int16(nvout, 0, "error");
        error = nv_error(nvout);
        if (error != 0) {
                pjdlog_common(LOG_ERR, 0, error,
                    "Unable to prepare event header");
                goto fail;
        }
        if (hast_proto_send(res, res->hr_event, nvout, NULL, 0) == -1) {
                pjdlog_errno(LOG_ERR, "Unable to send event header");
                goto fail;
        }
        nv_free(nvin);
        nv_free(nvout);
        return (0);
fail:
        if (nvin != NULL)
                nv_free(nvin);
        if (nvout != NULL)
                nv_free(nvout);
        return (-1);
}