src/log_logstash.c

   1 /**
   2  * collectd - src/log_logstash.c
   3  * Copyright (C) 2013       Pierre-Yves Ritschard
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the "Software"),
   7  * to deal in the Software without restriction, including without limitation
   8  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   9  * and/or sell copies of the Software, and to permit persons to whom the
  10  * Software is furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice shall be included in
  13  * all copies or substantial portions of the Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  18  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  21  * DEALINGS IN THE SOFTWARE.
  22  *
  23  * Authors:
  24  *   Pierre-Yves Ritschard <pyr at spootnik.org>
  25  * Acknowledgements:
  26  *   This file is largely inspired by logfile.c
  27  **/
  28
  29 #include "collectd.h"
  30 #include "common.h"
  31 #include "plugin.h"
  32
  33 #include <sys/types.h>
  34 #include <pthread.h>
  35 #include <yajl/yajl_common.h>
  36 #include <yajl/yajl_gen.h>
  37 #if HAVE_YAJL_YAJL_VERSION_H
  38 # include <yajl/yajl_version.h>
  39 #endif
  40 #if defined(YAJL_MAJOR) && (YAJL_MAJOR > 1)
  41 # define HAVE_YAJL_V2 1
  42 #endif
  43
  44 #define DEFAULT_LOGFILE LOCALSTATEDIR"/log/"PACKAGE_NAME".json.log"
  45
  46 #if COLLECT_DEBUG
  47 static int log_level = LOG_DEBUG;
  48 #else
  49 static int log_level = LOG_INFO;
  50 #endif /* COLLECT_DEBUG */
  51
  52 static pthread_mutex_t file_lock = PTHREAD_MUTEX_INITIALIZER;
  53
  54 static char *log_file = NULL;
  55
  56 static const char *config_keys[] =
  57 {
  58         "LogLevel",
  59         "File"
  60 };
  61 static int config_keys_num = STATIC_ARRAY_SIZE (config_keys);
  62
  63 static int log_logstash_config (const char *key, const char *value)
  64 {
  65
  66         if (0 == strcasecmp (key, "LogLevel")) {
  67                 log_level = parse_log_severity(value);
  68         if (log_level < 0) {
  69             log_level = LOG_INFO;
  70             ERROR("log_logstash: invalid loglevel [%s] defaulting to 'info'",
  71                   value);
  72             return 1;
  73         }
  74         }
  75         else if (0 == strcasecmp (key, "File")) {
  76                 sfree (log_file);
  77                 log_file = strdup (value);
  78         }
  79         else {
  80                 return -1;
  81         }
  82         return 0;
  83 } /* int log_logstash_config (const char *, const char *) */
  84
  85 static void log_logstash_print (yajl_gen g, int severity,
  86                 cdtime_t timestamp_time)
  87 {
  88         FILE *fh;
  89         _Bool do_close = 0;
  90         struct tm timestamp_tm;
  91         char timestamp_str[64];
  92         const unsigned char *buf;
  93         time_t tt;
  94 #if HAVE_YAJL_V2
  95         size_t len;
  96 #else
  97         unsigned int len;
  98 #endif
  99
 100         if (yajl_gen_string(g, (u_char *)"level", strlen("level")) !=
 101             yajl_gen_status_ok)
 102                 goto err;
 103
 104         switch (severity) {
 105         case LOG_ERR:
 106                 if (yajl_gen_string(g, (u_char *)"error", strlen("error")) !=
 107                     yajl_gen_status_ok)
 108                         goto err;
 109                 break;
 110         case LOG_WARNING:
 111                 if (yajl_gen_string(g, (u_char *)"warning",
 112                                     strlen("warning")) !=
 113                     yajl_gen_status_ok)
 114                         goto err;
 115                 break;
 116         case LOG_NOTICE:
 117                 if (yajl_gen_string(g, (u_char *)"notice", strlen("notice")) !=
 118                     yajl_gen_status_ok)
 119                         goto err;
 120                 break;
 121         case LOG_INFO:
 122                 if (yajl_gen_string(g, (u_char *)"info", strlen("info")) !=
 123                     yajl_gen_status_ok)
 124                         goto err;
 125                 break;
 126         case LOG_DEBUG:
 127                 if (yajl_gen_string(g, (u_char *)"debug", strlen("debug")) !=
 128                     yajl_gen_status_ok)
 129                         goto err;
 130                 break;
 131         default:
 132                 if (yajl_gen_string(g, (u_char *)"unknown",
 133                                     strlen("unknown")) !=
 134                     yajl_gen_status_ok)
 135                         goto err;
 136                 break;
 137         }
 138
 139         if (yajl_gen_string(g, (u_char *)"@timestamp", strlen("@timestamp")) !=
 140             yajl_gen_status_ok)
 141                 goto err;
 142
 143         tt = CDTIME_T_TO_TIME_T (timestamp_time);
 144         gmtime_r (&tt, &timestamp_tm);
 145
 146         /*
 147          * format time as a UTC ISO 8601 compliant string
 148          */
 149         strftime (timestamp_str, sizeof (timestamp_str),
 150                   "%Y-%m-%dT%H:%M:%SZ", &timestamp_tm);
 151         timestamp_str[sizeof (timestamp_str) - 1] = '\0';
 152
 153         if (yajl_gen_string(g, (u_char *)timestamp_str,
 154                             strlen(timestamp_str)) !=
 155             yajl_gen_status_ok)
 156                 goto err;
 157
 158         if (yajl_gen_map_close(g) != yajl_gen_status_ok)
 159                 goto err;
 160
 161         if (yajl_gen_get_buf(g, &buf, &len) != yajl_gen_status_ok)
 162                 goto err;
 163         pthread_mutex_lock (&file_lock);
 164
 165         if (log_file == NULL)
 166         {
 167                 fh = fopen (DEFAULT_LOGFILE, "a");
 168                 do_close = 1;
 169         } else if (strcasecmp(log_file, "stdout") == 0) {
 170         fh = stdout;
 171         do_close = 0;
 172         } else if (strcasecmp(log_file, "stderr") == 0) {
 173         fh = stderr;
 174         do_close = 0;
 175         } else {
 176                 fh = fopen (log_file, "a");
 177                 do_close = 1;
 178         }
 179
 180         if (fh == NULL)
 181         {
 182                         char errbuf[1024];
 183                         fprintf (stderr, "log_logstash plugin: fopen (%s) failed: %s\n",
 184                                         (log_file == NULL) ? DEFAULT_LOGFILE : log_file,
 185                                         sstrerror (errno, errbuf, sizeof (errbuf)));
 186         }
 187         else
 188         {
 189                 fprintf(fh, "%s\n", buf);
 190                 if (do_close) {
 191                         fclose (fh);
 192                 } else {
 193                         fflush(fh);
 194                 }
 195         }
 196         pthread_mutex_unlock (&file_lock);
 197         yajl_gen_free(g);
 198         return;
 199
 200  err:
 201         yajl_gen_free(g);
 202         fprintf(stderr, "Could not correctly generate JSON message\n");
 203         return;
 204 } /* void log_logstash_print */
 205
 206 static void log_logstash_log (int severity, const char *msg,
 207                 user_data_t __attribute__((unused)) *user_data)
 208 {
 209         yajl_gen g;
 210 #if !defined(HAVE_YAJL_V2)
 211         yajl_gen_config conf = {};
 212
 213         conf.beautify = 0;
 214 #endif
 215
 216         if (severity > log_level)
 217                 return;
 218
 219 #if HAVE_YAJL_V2
 220         g = yajl_gen_alloc(NULL);
 221 #else
 222         g = yajl_gen_alloc(&conf, NULL);
 223 #endif
 224
 225         if (g == NULL) {
 226                 fprintf(stderr, "Could not allocate JSON generator.\n");
 227                 return;
 228         }
 229
 230         if (yajl_gen_map_open(g) != yajl_gen_status_ok)
 231                 goto err;
 232         if (yajl_gen_string(g, (u_char *)"message", strlen("message")) !=
 233             yajl_gen_status_ok)
 234                 goto err;
 235         if (yajl_gen_string(g, (u_char *)msg, strlen(msg)) !=
 236             yajl_gen_status_ok)
 237                 goto err;
 238
 239         log_logstash_print (g, severity, cdtime ());
 240         return;
 241  err:
 242         yajl_gen_free(g);
 243         fprintf(stderr, "Could not generate JSON message preamble\n");
 244         return;
 245
 246 } /* void log_logstash_log (int, const char *) */
 247
 248 static int log_logstash_notification (const notification_t *n,
 249                 user_data_t __attribute__((unused)) *user_data)
 250 {
 251         yajl_gen g;
 252 #if HAVE_YAJL_V2
 253         g = yajl_gen_alloc(NULL);
 254 #else
 255         yajl_gen_config conf = {};
 256
 257         conf.beautify = 0;
 258         g = yajl_gen_alloc(&conf, NULL);
 259 #endif
 260
 261         if (g == NULL) {
 262                 fprintf(stderr, "Could not allocate JSON generator.\n");
 263                 return (0);
 264         }
 265
 266         if (yajl_gen_map_open(g) != yajl_gen_status_ok)
 267                 goto err;
 268         if (yajl_gen_string(g, (u_char *)"message", strlen("message")) !=
 269             yajl_gen_status_ok)
 270                 goto err;
 271         if (strlen(n->message) > 0) {
 272                 if (yajl_gen_string(g, (u_char *)n->message,
 273                                     strlen(n->message)) !=
 274                     yajl_gen_status_ok)
 275                         goto err;
 276         } else {
 277                 if (yajl_gen_string(g, (u_char *)"notification without a message",
 278                                     strlen("notification without a message")) !=
 279                     yajl_gen_status_ok)
 280                         goto err;
 281         }
 282
 283         if (strlen(n->host) > 0) {
 284                 if (yajl_gen_string(g, (u_char *)"host", strlen("host")) !=
 285                     yajl_gen_status_ok)
 286                         goto err;
 287                 if (yajl_gen_string(g, (u_char *)n->host, strlen(n->host)) !=
 288                     yajl_gen_status_ok)
 289                         goto err;
 290
 291         }
 292         if (strlen(n->plugin) > 0) {
 293                 if (yajl_gen_string(g, (u_char *)"plugin", strlen("plugin")) !=
 294                     yajl_gen_status_ok)
 295                         goto err;
 296                 if (yajl_gen_string(g, (u_char *)n->plugin, strlen(n->plugin)) !=
 297                     yajl_gen_status_ok)
 298                         goto err;
 299         }
 300         if (strlen(n->plugin_instance) > 0) {
 301                 if (yajl_gen_string(g, (u_char *)"plugin_instance",
 302                                     strlen("plugin_instance")) !=
 303                     yajl_gen_status_ok)
 304                         goto err;
 305                 if (yajl_gen_string(g, (u_char *)n->plugin_instance,
 306                                     strlen(n->plugin_instance)) !=
 307                     yajl_gen_status_ok)
 308                         goto err;
 309         }
 310         if (strlen(n->type) > 0) {
 311                 if (yajl_gen_string(g, (u_char *)"type", strlen("type")) !=
 312                     yajl_gen_status_ok)
 313                         goto err;
 314                 if (yajl_gen_string(g, (u_char *)n->type, strlen(n->type)) !=
 315                     yajl_gen_status_ok)
 316                         goto err;
 317         }
 318         if (strlen(n->type_instance) > 0) {
 319                 if (yajl_gen_string(g, (u_char *)"type_instance",
 320                                     strlen("type_instance")) !=
 321                     yajl_gen_status_ok)
 322                         goto err;
 323                 if (yajl_gen_string(g, (u_char *)n->type_instance,
 324                                     strlen(n->type_instance)) !=
 325                     yajl_gen_status_ok)
 326                         goto err;
 327         }
 328
 329         if (yajl_gen_string(g, (u_char *)"severity",
 330                             strlen("severity")) !=
 331             yajl_gen_status_ok)
 332                 goto err;
 333
 334         switch (n->severity) {
 335         case NOTIF_FAILURE:
 336                 if (yajl_gen_string(g, (u_char *)"failure",
 337                                     strlen("failure")) !=
 338                     yajl_gen_status_ok)
 339                         goto err;
 340                 break;
 341         case NOTIF_WARNING:
 342                 if (yajl_gen_string(g, (u_char *)"warning",
 343                                     strlen("warning")) !=
 344                     yajl_gen_status_ok)
 345                         goto err;
 346                 break;
 347         case NOTIF_OKAY:
 348                 if (yajl_gen_string(g, (u_char *)"ok",
 349                                     strlen("ok")) !=
 350                     yajl_gen_status_ok)
 351                         goto err;
 352                 break;
 353         default:
 354                 if (yajl_gen_string(g, (u_char *)"unknown",
 355                                     strlen("unknown")) !=
 356                     yajl_gen_status_ok)
 357                         goto err;
 358                 break;
 359         }
 360
 361         log_logstash_print (g, LOG_INFO, (n->time != 0) ? n->time : cdtime ());
 362         return (0);
 363
 364  err:
 365         yajl_gen_free(g);
 366         fprintf(stderr, "Could not correctly generate JSON notification\n");
 367         return (0);
 368 } /* int log_logstash_notification */
 369
 370 void module_register (void)
 371 {
 372         plugin_register_config ("log_logstash",
 373                                 log_logstash_config,
 374                                 config_keys,
 375                                 config_keys_num);
 376         plugin_register_log ("log_logstash",
 377                              log_logstash_log,
 378                              /* user_data = */ NULL);
 379         plugin_register_notification ("log_logstash",
 380                                       log_logstash_notification,
 381                                       /* user_data = */ NULL);
 382 } /* void module_register (void) */
 383
 384 /* vim: set sw=4 ts=4 tw=78 noexpandtab : */