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("$FreeBSD$"); 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 43 void 44 event_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 */ 77 done: 78 if (nvin != NULL) 79 nv_free(nvin); 80 if (nvout != NULL) 81 nv_free(nvout); 82 } 83 84 int 85 event_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); 156 fail: 157 if (nvin != NULL) 158 nv_free(nvin); 159 if (nvout != NULL) 160 nv_free(nvout); 161 return (-1); 162 } 163