event.c revision 212049
1212049Spjd/*- 2212049Spjd * Copyright (c) 2010 Pawel Jakub Dawidek <pjd@FreeBSD.org> 3212049Spjd * All rights reserved. 4212049Spjd * 5212049Spjd * Redistribution and use in source and binary forms, with or without 6212049Spjd * modification, are permitted provided that the following conditions 7212049Spjd * are met: 8212049Spjd * 1. Redistributions of source code must retain the above copyright 9212049Spjd * notice, this list of conditions and the following disclaimer. 10212049Spjd * 2. Redistributions in binary form must reproduce the above copyright 11212049Spjd * notice, this list of conditions and the following disclaimer in the 12212049Spjd * documentation and/or other materials provided with the distribution. 13212049Spjd * 14212049Spjd * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND 15212049Spjd * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16212049Spjd * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17212049Spjd * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 18212049Spjd * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19212049Spjd * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20212049Spjd * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21212049Spjd * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22212049Spjd * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23212049Spjd * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24212049Spjd * SUCH DAMAGE. 25212049Spjd */ 26212049Spjd 27212049Spjd#include <sys/cdefs.h> 28212049Spjd__FBSDID("$FreeBSD: head/sbin/hastd/event.c 212049 2010-08-31 09:38:43Z pjd $"); 29212049Spjd 30212049Spjd#include <assert.h> 31212049Spjd#include <errno.h> 32212049Spjd 33212049Spjd#include "hast.h" 34212049Spjd#include "hast_proto.h" 35212049Spjd#include "hooks.h" 36212049Spjd#include "nv.h" 37212049Spjd#include "pjdlog.h" 38212049Spjd#include "proto.h" 39212049Spjd#include "subr.h" 40212049Spjd 41212049Spjd#include "event.h" 42212049Spjd 43212049Spjdvoid 44212049Spjdevent_send(const struct hast_resource *res, int event) 45212049Spjd{ 46212049Spjd struct nv *nvin, *nvout; 47212049Spjd int error; 48212049Spjd 49212049Spjd assert(res != NULL); 50212049Spjd assert(event >= EVENT_MIN && event <= EVENT_MAX); 51212049Spjd 52212049Spjd nvin = nvout = NULL; 53212049Spjd 54212049Spjd /* 55212049Spjd * Prepare and send event to parent process. 56212049Spjd */ 57212049Spjd nvout = nv_alloc(); 58212049Spjd nv_add_uint8(nvout, (uint8_t)event, "event"); 59212049Spjd error = nv_error(nvout); 60212049Spjd if (error != 0) { 61212049Spjd pjdlog_common(LOG_ERR, 0, error, 62212049Spjd "Unable to prepare event header"); 63212049Spjd goto done; 64212049Spjd } 65212049Spjd if (hast_proto_send(res, res->hr_event, nvout, NULL, 0) < 0) { 66212049Spjd pjdlog_errno(LOG_ERR, "Unable to send event header"); 67212049Spjd goto done; 68212049Spjd } 69212049Spjd if (hast_proto_recv_hdr(res->hr_event, &nvin) < 0) { 70212049Spjd pjdlog_errno(LOG_ERR, "Unable to receive event header"); 71212049Spjd goto done; 72212049Spjd } 73212049Spjd /* 74212049Spjd * Do nothing with the answer. We only wait for it to be sure not 75212049Spjd * to exit too quickly after sending an event and exiting immediately. 76212049Spjd */ 77212049Spjddone: 78212049Spjd if (nvin != NULL) 79212049Spjd nv_free(nvin); 80212049Spjd if (nvout != NULL) 81212049Spjd nv_free(nvout); 82212049Spjd} 83212049Spjd 84212049Spjdint 85212049Spjdevent_recv(const struct hast_resource *res) 86212049Spjd{ 87212049Spjd struct nv *nvin, *nvout; 88212049Spjd const char *evstr; 89212049Spjd uint8_t event; 90212049Spjd int error; 91212049Spjd 92212049Spjd assert(res != NULL); 93212049Spjd 94212049Spjd nvin = nvout = NULL; 95212049Spjd 96212049Spjd if (hast_proto_recv_hdr(res->hr_event, &nvin) < 0) { 97212049Spjd /* 98212049Spjd * First error log as debug. This is because worker process 99212049Spjd * most likely exited. 100212049Spjd */ 101212049Spjd pjdlog_common(LOG_DEBUG, 1, errno, 102212049Spjd "Unable to receive event header"); 103212049Spjd goto fail; 104212049Spjd } 105212049Spjd 106212049Spjd event = nv_get_uint8(nvin, "event"); 107212049Spjd if (event == EVENT_NONE) { 108212049Spjd pjdlog_error("Event header is missing 'event' field."); 109212049Spjd goto fail; 110212049Spjd } 111212049Spjd 112212049Spjd switch (event) { 113212049Spjd case EVENT_CONNECT: 114212049Spjd evstr = "connect"; 115212049Spjd break; 116212049Spjd case EVENT_DISCONNECT: 117212049Spjd evstr = "disconnect"; 118212049Spjd break; 119212049Spjd case EVENT_SYNCSTART: 120212049Spjd evstr = "syncstart"; 121212049Spjd break; 122212049Spjd case EVENT_SYNCDONE: 123212049Spjd evstr = "syncdone"; 124212049Spjd break; 125212049Spjd case EVENT_SYNCINTR: 126212049Spjd evstr = "syncintr"; 127212049Spjd break; 128212049Spjd case EVENT_SPLITBRAIN: 129212049Spjd evstr = "split-brain"; 130212049Spjd break; 131212049Spjd default: 132212049Spjd pjdlog_error("Event header contain invalid event number (%hhu).", 133212049Spjd event); 134212049Spjd goto fail; 135212049Spjd } 136212049Spjd 137212049Spjd pjdlog_prefix_set("[%s] (%s) ", res->hr_name, role2str(res->hr_role)); 138212049Spjd hook_exec(res->hr_exec, evstr, res->hr_name, NULL); 139212049Spjd pjdlog_prefix_set("%s", ""); 140212049Spjd 141212049Spjd nvout = nv_alloc(); 142212049Spjd nv_add_int16(nvout, 0, "error"); 143212049Spjd error = nv_error(nvout); 144212049Spjd if (error != 0) { 145212049Spjd pjdlog_common(LOG_ERR, 0, error, 146212049Spjd "Unable to prepare event header"); 147212049Spjd goto fail; 148212049Spjd } 149212049Spjd if (hast_proto_send(res, res->hr_event, nvout, NULL, 0) < 0) { 150212049Spjd pjdlog_errno(LOG_ERR, "Unable to send event header"); 151212049Spjd goto fail; 152212049Spjd } 153212049Spjd nv_free(nvin); 154212049Spjd nv_free(nvout); 155212049Spjd return (0); 156212049Spjdfail: 157212049Spjd if (nvin != NULL) 158212049Spjd nv_free(nvin); 159212049Spjd if (nvout != NULL) 160212049Spjd nv_free(nvout); 161212049Spjd return (-1); 162212049Spjd} 163