event.c revision 212049 
1/*-
2 * Copyright (c) 2010 Pawel Jakub Dawidek <pjd@FreeBSD.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD: head/sbin/hastd/event.c 212049 2010-08-31 09:38:43Z pjd $");
29
30#include <assert.h>
31#include <errno.h>
32
33#include "hast.h"
34#include "hast_proto.h"
35#include "hooks.h"
36#include "nv.h"
37#include "pjdlog.h"
38#include "proto.h"
39#include "subr.h"
40
41#include "event.h"
42
43void
44event_send(const struct hast_resource *res, int event)
45{
46	struct nv *nvin, *nvout;
47	int error;
48
49	assert(res != NULL);
50	assert(event >= EVENT_MIN && event <= EVENT_MAX);
51
52	nvin = nvout = NULL;
53
54	/*
55	 * Prepare and send event to parent process.
56	 */
57	nvout = nv_alloc();
58	nv_add_uint8(nvout, (uint8_t)event, "event");
59	error = nv_error(nvout);
60	if (error != 0) {
61		pjdlog_common(LOG_ERR, 0, error,
62		    "Unable to prepare event header");
63		goto done;
64	}
65	if (hast_proto_send(res, res->hr_event, nvout, NULL, 0) < 0) {
66		pjdlog_errno(LOG_ERR, "Unable to send event header");
67		goto done;
68	}
69	if (hast_proto_recv_hdr(res->hr_event, &nvin) < 0) {
70		pjdlog_errno(LOG_ERR, "Unable to receive event header");
71		goto done;
72	}
73	/*
74	 * Do nothing with the answer. We only wait for it to be sure not
75	 * to exit too quickly after sending an event and exiting immediately.
76	 */
77done:
78	if (nvin != NULL)
79		nv_free(nvin);
80	if (nvout != NULL)
81		nv_free(nvout);
82}
83
84int
85event_recv(const struct hast_resource *res)
86{
87	struct nv *nvin, *nvout;
88	const char *evstr;
89	uint8_t event;
90	int error;
91
92	assert(res != NULL);
93
94	nvin = nvout = NULL;
95
96	if (hast_proto_recv_hdr(res->hr_event, &nvin) < 0) {
97		/*
98		 * First error log as debug. This is because worker process
99		 * most likely exited.
100		 */
101		pjdlog_common(LOG_DEBUG, 1, errno,
102		    "Unable to receive event header");
103		goto fail;
104	}
105
106	event = nv_get_uint8(nvin, "event");
107	if (event == EVENT_NONE) {
108		pjdlog_error("Event header is missing 'event' field.");
109		goto fail;
110	}
111
112	switch (event) {
113	case EVENT_CONNECT:
114		evstr = "connect";
115		break;
116	case EVENT_DISCONNECT:
117		evstr = "disconnect";
118		break;
119	case EVENT_SYNCSTART:
120		evstr = "syncstart";
121		break;
122	case EVENT_SYNCDONE:
123		evstr = "syncdone";
124		break;
125	case EVENT_SYNCINTR:
126		evstr = "syncintr";
127		break;
128	case EVENT_SPLITBRAIN:
129		evstr = "split-brain";
130		break;
131	default:
132		pjdlog_error("Event header contain invalid event number (%hhu).",
133		    event);
134		goto fail;
135	}
136
137	pjdlog_prefix_set("[%s] (%s) ", res->hr_name, role2str(res->hr_role));
138	hook_exec(res->hr_exec, evstr, res->hr_name, NULL);
139	pjdlog_prefix_set("%s", "");
140
141	nvout = nv_alloc();
142	nv_add_int16(nvout, 0, "error");
143	error = nv_error(nvout);
144	if (error != 0) {
145		pjdlog_common(LOG_ERR, 0, error,
146		    "Unable to prepare event header");
147		goto fail;
148	}
149	if (hast_proto_send(res, res->hr_event, nvout, NULL, 0) < 0) {
150		pjdlog_errno(LOG_ERR, "Unable to send event header");
151		goto fail;
152	}
153	nv_free(nvin);
154	nv_free(nvout);
155	return (0);
156fail:
157	if (nvin != NULL)
158		nv_free(nvin);
159	if (nvout != NULL)
160		nv_free(nvout);
161	return (-1);
162}
163