summaryrefslogtreecommitdiff
path: root/server/monitor.c
blob: 2d3283fd31416c027c76954734ef665973107195 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
/* 
   SSSD

   Service monitor

   Copyright (C) Simo Sorce			2008

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#include <sys/types.h>
#include <sys/wait.h>
#include <sys/time.h>
#include <time.h>
#include "../events/events.h"
#include "util/util.h"
#include "service.h"
#include "confdb/confdb.h"

struct mt_ctx {
    struct event_context *ev;
    struct confdb_ctx *cdb;
	char **services;
};

struct mt_srv {
    const char *name;
    struct mt_ctx *mt_ctx;
    pid_t pid;
    time_t last_restart;
    int restarts;
};

static void set_tasks_checker(struct mt_srv *srv);

static void tasks_check_handler(struct event_context *ev,
                                struct timed_event *te,
                                struct timeval t, void *ptr)
{
    struct mt_srv *srv = talloc_get_type(ptr, struct mt_srv);
    time_t now = time(NULL);
    int status;
    pid_t pid;
    int ret;

    pid = waitpid(srv->pid, &status, WNOHANG);
    if (pid == 0) {
        set_tasks_checker(srv);
        return;
    }

    if (pid != srv->pid) {
        DEBUG(1, ("bad return (%d) from waitpid() waiting for %d\n",
                  pid, srv->pid));
        /* TODO: what do we do now ? */
    }

    if (WIFEXITED(status)) { /* children exited on it's own ?? */
        /* TODO: check configuration to see if it was removed
         * from the list of process to run */
        DEBUG(0,("Process [%s] exited on it's own ?!\n", srv->name));
    }

    if (srv->last_restart != 0) {
        if ((now - srv->last_restart) > 30) { /* TODO: get val from config */
            /* it was long ago reset restart threshold */
            srv->restarts = 0;
        }
    }

    /* restart the process */
    if (srv->restarts < 3) { /* TODO: get val from config */

        ret = server_service_init(srv->name, srv->mt_ctx->ev, &srv->pid);
        if (ret != EOK) {
            DEBUG(0,("Failed to restart service '%s'\n", srv->name));
            talloc_free(srv);
            return;
        }

        srv->restarts++;
        srv->last_restart = now;

        set_tasks_checker(srv);
        return;
    }

    DEBUG(0, ("Process [%s], definitely stopped!\n", srv->name));
    talloc_free(srv);
}

static void set_tasks_checker(struct mt_srv *srv)
{
    struct timed_event *te = NULL;
    struct timeval tv;

    gettimeofday(&tv, NULL);
    tv.tv_sec += 2;
    tv.tv_usec = 0;
    te = event_add_timed(srv->mt_ctx->ev, srv, tv, tasks_check_handler, srv);
    if (te == NULL) {
        DEBUG(0, ("failed to add event, monitor offline for [%s]!\n",
                  srv->name));
        /* FIXME: shutdown ? */
    }
}

int start_monitor(TALLOC_CTX *mem_ctx,
                  struct event_context *event_ctx,
                  struct confdb_ctx *cdb)
{
    struct mt_ctx *ctx;
    struct mt_srv *srv;
    int ret, i;

    ctx = talloc_zero(mem_ctx, struct mt_ctx);
    if (!ctx) {
        DEBUG(0, ("fatal error initializing monitor!\n"));
        return ENOMEM;
    }
    ctx->ev = event_ctx;

    ret = confdb_get_param(cdb, mem_ctx, "config.services",
                           "activeServices", &ctx->services);

    if (ctx->services[0] == NULL) {
        DEBUG(0, ("No services configured!\n"));
        return EINVAL;
    }

    for (i = 0; ctx->services[i]; i++) {

        srv = talloc_zero(ctx, struct mt_srv);
        if (!srv) {
            talloc_free(ctx);
            return ENOMEM;
        }
        srv->name = ctx->services[i];
        srv->mt_ctx = ctx;

        ret = server_service_init(srv->name, event_ctx, &srv->pid);
        if (ret != EOK) {
            DEBUG(0,("Failed to restart service '%s'\n", srv->name));
            talloc_free(srv);
        }

        set_tasks_checker(srv);
    }

    return EOK;
}