src/plugins_d.c

   1 #ifdef HAVE_CONFIG_H
   2 #include <config.h>
   3 #endif
   4 #include <sys/types.h>
   5 #include <dirent.h>
   6 #include <pthread.h>
   7 #include <string.h>
   8 #include <stdio.h>
   9 #include <stdlib.h>
  10 #include <signal.h>
  11
  12 #include "main.h"
  13 #include "common.h"
  14 #include "appconfig.h"
  15 #include "log.h"
  16 #include "rrd.h"
  17 #include "popen.h"
  18 #include "plugins_d.h"
  19
  20 struct plugind *pluginsd_root = NULL;
  21
  22 #define MAX_WORDS 20
  23
  24 static inline int pluginsd_space(char c) {
  25         switch(c) {
  26         case ' ':
  27         case '\t':
  28         case '\r':
  29         case '\n':
  30         case '=':
  31                 return 1;
  32
  33         default:
  34                 return 0;
  35         }
  36 }
  37
  38 static int pluginsd_split_words(char *str, char **words, int max_words) {
  39         char *s = str, quote = 0;
  40         int i = 0, j;
  41
  42         // skip all white space
  43         while(unlikely(pluginsd_space(*s))) s++;
  44
  45         // check for quote
  46         if(unlikely(*s == '\'' || *s == '"')) {
  47                 quote = *s;     // remember the quote
  48                 s++;            // skip the quote
  49         }
  50
  51         // store the first word
  52         words[i++] = s;
  53
  54         // while we have something
  55         while(likely(*s)) {
  56                 // if it is escape
  57                 if(unlikely(*s == '\\' && s[1])) {
  58                         s += 2;
  59                         continue;
  60                 }
  61
  62                 // if it is quote
  63                 else if(unlikely(*s == quote)) {
  64                         quote = 0;
  65                         *s = ' ';
  66                         continue;
  67                 }
  68
  69                 // if it is a space
  70                 else if(unlikely(quote == 0 && pluginsd_space(*s))) {
  71
  72                         // terminate the word
  73                         *s++ = '\0';
  74
  75                         // skip all white space
  76                         while(likely(pluginsd_space(*s))) s++;
  77
  78                         // check for quote
  79                         if(unlikely(*s == '\'' || *s == '"')) {
  80                                 quote = *s;     // remember the quote
  81                                 s++;            // skip the quote
  82                         }
  83
  84                         // if we reached the end, stop
  85                         if(unlikely(!*s)) break;
  86
  87                         // store the next word
  88                         if(likely(i < max_words)) words[i++] = s;
  89                         else break;
  90                 }
  91
  92                 // anything else
  93                 else s++;
  94         }
  95
  96         // terminate the words
  97         j = i;
  98         while(likely(j < max_words)) words[j++] = NULL;
  99
 100         return i;
 101 }
 102
 103
 104 void *pluginsd_worker_thread(void *arg)
 105 {
 106         struct plugind *cd = (struct plugind *)arg;
 107         char line[PLUGINSD_LINE_MAX + 1];
 108
 109 #ifdef DETACH_PLUGINS_FROM_NETDATA
 110         unsigned long long usec = 0, susec = 0;
 111         struct timeval last = {0, 0} , now = {0, 0};
 112 #endif
 113
 114         char *words[MAX_WORDS] = { NULL };
 115         uint32_t SET_HASH = simple_hash("SET");
 116         uint32_t BEGIN_HASH = simple_hash("BEGIN");
 117         uint32_t END_HASH = simple_hash("END");
 118         uint32_t FLUSH_HASH = simple_hash("FLUSH");
 119         uint32_t CHART_HASH = simple_hash("CHART");
 120         uint32_t DIMENSION_HASH = simple_hash("DIMENSION");
 121         uint32_t DISABLE_HASH = simple_hash("DISABLE");
 122 #ifdef DETACH_PLUGINS_FROM_NETDATA
 123         uint32_t MYPID_HASH = simple_hash("MYPID");
 124         uint32_t STOPPING_WAKE_ME_UP_PLEASE_HASH = simple_hash("STOPPING_WAKE_ME_UP_PLEASE");
 125 #endif
 126
 127         while(likely(1)) {
 128                 FILE *fp = mypopen(cd->cmd, &cd->pid);
 129                 if(unlikely(!fp)) {
 130                         error("Cannot popen(\"%s\", \"r\").", cd->cmd);
 131                         break;
 132                 }
 133
 134                 info("PLUGINSD: '%s' running on pid %d", cd->fullfilename, cd->pid);
 135
 136                 RRDSET *st = NULL;
 137                 unsigned long long count = 0;
 138                 char *s;
 139                 uint32_t hash;
 140
 141                 while(likely(fgets(line, PLUGINSD_LINE_MAX, fp) != NULL)) {
 142                         line[PLUGINSD_LINE_MAX] = '\0';
 143
 144                         // debug(D_PLUGINSD, "PLUGINSD: %s: %s", cd->filename, line);
 145
 146                         int w = pluginsd_split_words(line, words, MAX_WORDS);
 147                         s = words[0];
 148                         if(unlikely(!s || !*s || !w)) {
 149                                 // debug(D_PLUGINSD, "PLUGINSD: empty line");
 150                                 continue;
 151                         }
 152
 153                         // debug(D_PLUGINSD, "PLUGINSD: words 0='%s' 1='%s' 2='%s' 3='%s' 4='%s' 5='%s' 6='%s' 7='%s' 8='%s' 9='%s'", words[0], words[1], words[2], words[3], words[4], words[5], words[6], words[7], words[8], words[9]);
 154
 155                         hash = simple_hash(s);
 156
 157                         if(likely(hash == SET_HASH && !strcmp(s, "SET"))) {
 158                                 char *dimension = words[1];
 159                                 char *value = words[2];
 160
 161                                 if(unlikely(!dimension || !*dimension)) {
 162                                         error("PLUGINSD: '%s' is requesting a SET on chart '%s', without a dimension. Disabling it.", cd->fullfilename, st->id);
 163                                         cd->enabled = 0;
 164                                         killpid(cd->pid, SIGTERM);
 165                                         break;
 166                                 }
 167
 168                                 if(unlikely(!value || !*value)) value = NULL;
 169
 170                                 if(unlikely(!st)) {
 171                                         error("PLUGINSD: '%s' is requesting a SET on dimension %s with value %s, without a BEGIN. Disabling it.", cd->fullfilename, dimension, value?value:"<nothing>");
 172                                         cd->enabled = 0;
 173                                         killpid(cd->pid, SIGTERM);
 174                                         break;
 175                                 }
 176
 177                                 if(unlikely(st->debug)) debug(D_PLUGINSD, "PLUGINSD: '%s' is setting dimension %s/%s to %s", cd->fullfilename, st->id, dimension, value?value:"<nothing>");
 178
 179                                 if(value) rrddim_set(st, dimension, atoll(value));
 180
 181                                 count++;
 182                         }
 183                         else if(likely(hash == BEGIN_HASH && !strcmp(s, "BEGIN"))) {
 184                                 char *id = words[1];
 185                                 char *microseconds_txt = words[2];
 186
 187                                 if(unlikely(!id)) {
 188                                         error("PLUGINSD: '%s' is requesting a BEGIN without a chart id. Disabling it.", cd->fullfilename);
 189                                         cd->enabled = 0;
 190                                         killpid(cd->pid, SIGTERM);
 191                                         break;
 192                                 }
 193
 194                                 st = rrdset_find(id);
 195                                 if(unlikely(!st)) {
 196                                         error("PLUGINSD: '%s' is requesting a BEGIN on chart '%s', which does not exist. Disabling it.", cd->fullfilename, id);
 197                                         cd->enabled = 0;
 198                                         killpid(cd->pid, SIGTERM);
 199                                         break;
 200                                 }
 201
 202                                 if(likely(st->counter_done)) {
 203                                         unsigned long long microseconds = 0;
 204                                         if(microseconds_txt && *microseconds_txt) microseconds = strtoull(microseconds_txt, NULL, 10);
 205                                         if(microseconds) rrdset_next_usec(st, microseconds);
 206                                         else rrdset_next_plugins(st);
 207                                 }
 208                         }
 209                         else if(likely(hash == END_HASH && !strcmp(s, "END"))) {
 210                                 if(unlikely(!st)) {
 211                                         error("PLUGINSD: '%s' is requesting an END, without a BEGIN. Disabling it.", cd->fullfilename);
 212                                         cd->enabled = 0;
 213                                         killpid(cd->pid, SIGTERM);
 214                                         break;
 215                                 }
 216
 217                                 if(unlikely(st->debug)) debug(D_PLUGINSD, "PLUGINSD: '%s' is requesting a END on chart %s", cd->fullfilename, st->id);
 218
 219                                 rrdset_done(st);
 220                                 st = NULL;
 221                         }
 222                         else if(likely(hash == FLUSH_HASH && !strcmp(s, "FLUSH"))) {
 223                                 debug(D_PLUGINSD, "PLUGINSD: '%s' is requesting a FLUSH", cd->fullfilename);
 224                                 st = NULL;
 225                         }
 226                         else if(likely(hash == CHART_HASH && !strcmp(s, "CHART"))) {
 227                                 st = NULL;
 228
 229                                 char *type = words[1];
 230                                 char *id = NULL;
 231                                 if(likely(type)) {
 232                                         id = strchr(type, '.');
 233                                         if(likely(id)) { *id = '\0'; id++; }
 234                                 }
 235                                 char *name = words[2];
 236                                 char *title = words[3];
 237                                 char *units = words[4];
 238                                 char *family = words[5];
 239                                 char *category = words[6];
 240                                 char *chart = words[7];
 241                                 char *priority_s = words[8];
 242                                 char *update_every_s = words[9];
 243
 244                                 if(unlikely(!type || !*type || !id || !*id)) {
 245                                         error("PLUGINSD: '%s' is requesting a CHART, without a type.id. Disabling it.", cd->fullfilename);
 246                                         cd->enabled = 0;
 247                                         killpid(cd->pid, SIGTERM);
 248                                         break;
 249                                 }
 250
 251                                 int priority = 1000;
 252                                 if(likely(priority_s)) priority = atoi(priority_s);
 253
 254                                 int update_every = cd->update_every;
 255                                 if(likely(update_every_s)) update_every = atoi(update_every_s);
 256                                 if(unlikely(!update_every)) update_every = cd->update_every;
 257
 258                                 int chart_type = RRDSET_TYPE_LINE;
 259                                 if(unlikely(chart)) chart_type = rrdset_type_id(chart);
 260
 261                                 if(unlikely(!name || !*name)) name = NULL;
 262                                 if(unlikely(!family || !*family)) family = id;
 263                                 if(unlikely(!category || !*category)) category = type;
 264
 265                                 st = rrdset_find_bytype(type, id);
 266                                 if(unlikely(!st)) {
 267                                         debug(D_PLUGINSD, "PLUGINSD: Creating chart type='%s', id='%s', name='%s', family='%s', category='%s', chart='%s', priority=%d, update_every=%d"
 268                                                 , type, id
 269                                                 , name?name:""
 270                                                 , family?family:""
 271                                                 , category?category:""
 272                                                 , rrdset_type_name(chart_type)
 273                                                 , priority
 274                                                 , update_every
 275                                                 );
 276
 277                                         st = rrdset_create(type, id, name, family, title, units, priority, update_every, chart_type);
 278                                         cd->update_every = update_every;
 279
 280                                         if(unlikely(strcmp(category, "none") == 0)) st->isdetail = 1;
 281                                 }
 282                                 else debug(D_PLUGINSD, "PLUGINSD: Chart '%s' already exists. Not adding it again.", st->id);
 283                         }
 284                         else if(likely(hash == DIMENSION_HASH && !strcmp(s, "DIMENSION"))) {
 285                                 char *id = words[1];
 286                                 char *name = words[2];
 287                                 char *algorithm = words[3];
 288                                 char *multiplier_s = words[4];
 289                                 char *divisor_s = words[5];
 290                                 char *hidden = words[6];
 291
 292                                 if(unlikely(!id || !*id)) {
 293                                         error("PLUGINSD: '%s' is requesting a DIMENSION, without an id. Disabling it.", cd->fullfilename);
 294                                         cd->enabled = 0;
 295                                         killpid(cd->pid, SIGTERM);
 296                                         break;
 297                                 }
 298
 299                                 if(unlikely(!st)) {
 300                                         error("PLUGINSD: '%s' is requesting a DIMENSION, without a CHART. Disabling it.", cd->fullfilename);
 301                                         cd->enabled = 0;
 302                                         killpid(cd->pid, SIGTERM);
 303                                         break;
 304                                 }
 305
 306                                 long multiplier = 1;
 307                                 if(multiplier_s && *multiplier_s) multiplier = atol(multiplier_s);
 308                                 if(unlikely(!multiplier)) multiplier = 1;
 309
 310                                 long divisor = 1;
 311                                 if(likely(divisor_s && *divisor_s)) divisor = atol(divisor_s);
 312                                 if(unlikely(!divisor)) divisor = 1;
 313
 314                                 if(unlikely(!algorithm || !*algorithm)) algorithm = "absolute";
 315
 316                                 if(unlikely(st->debug)) debug(D_PLUGINSD, "PLUGINSD: Creating dimension in chart %s, id='%s', name='%s', algorithm='%s', multiplier=%ld, divisor=%ld, hidden='%s'"
 317                                         , st->id
 318                                         , id
 319                                         , name?name:""
 320                                         , rrddim_algorithm_name(rrddim_algorithm_id(algorithm))
 321                                         , multiplier
 322                                         , divisor
 323                                         , hidden?hidden:""
 324                                         );
 325
 326                                 RRDDIM *rd = rrddim_find(st, id);
 327                                 if(unlikely(!rd)) {
 328                                         rd = rrddim_add(st, id, name, multiplier, divisor, rrddim_algorithm_id(algorithm));
 329                                         if(unlikely(hidden && strcmp(hidden, "hidden") == 0)) rd->hidden = 1;
 330                                 }
 331                                 else if(unlikely(st->debug)) debug(D_PLUGINSD, "PLUGINSD: dimension %s/%s already exists. Not adding it again.", st->id, id);
 332                         }
 333                         else if(unlikely(hash == DISABLE_HASH && !strcmp(s, "DISABLE"))) {
 334                                 error("PLUGINSD: '%s' called DISABLE. Disabling it.", cd->fullfilename);
 335                                 cd->enabled = 0;
 336                                 killpid(cd->pid, SIGTERM);
 337                                 break;
 338                         }
 339 #ifdef DETACH_PLUGINS_FROM_NETDATA
 340                         else if(likely(hash == MYPID_HASH && !strcmp(s, "MYPID"))) {
 341                                 char *pid_s = words[1];
 342                                 pid_t pid = atol(pid_s);
 343
 344                                 if(likely(pid)) cd->pid = pid;
 345                                 debug(D_PLUGINSD, "PLUGINSD: %s is on pid %d", cd->id, cd->pid);
 346                         }
 347                         else if(likely(hash == STOPPING_WAKE_ME_UP_PLEASE_HASH && !strcmp(s, "STOPPING_WAKE_ME_UP_PLEASE"))) {
 348                                 error("PLUGINSD: '%s' (pid %d) called STOPPING_WAKE_ME_UP_PLEASE.", cd->fullfilename, cd->pid);
 349
 350                                 gettimeofday(&now, NULL);
 351                                 if(unlikely(!usec && !susec)) {
 352                                         // our first run
 353                                         susec = cd->rrd_update_every * 1000000ULL;
 354                                 }
 355                                 else {
 356                                         // second+ run
 357                                         usec = usecdiff(&now, &last) - susec;
 358                                         error("PLUGINSD: %s last loop took %llu usec (worked for %llu, sleeped for %llu).\n", cd->fullfilename, usec + susec, usec, susec);
 359                                         if(unlikely(usec < (rrd_update_every * 1000000ULL / 2ULL))) susec = (rrd_update_every * 1000000ULL) - usec;
 360                                         else susec = rrd_update_every * 1000000ULL / 2ULL;
 361                                 }
 362
 363                                 error("PLUGINSD: %s sleeping for %llu. Will kill with SIGCONT pid %d to wake it up.\n", cd->fullfilename, susec, cd->pid);
 364                                 usleep(susec);
 365                                 killpid(cd->pid, SIGCONT);
 366                                 bcopy(&now, &last, sizeof(struct timeval));
 367                                 break;
 368                         }
 369 #endif
 370                         else {
 371                                 error("PLUGINSD: '%s' is sending command '%s' which is not known by netdata. Disabling it.", cd->fullfilename, s);
 372                                 cd->enabled = 0;
 373                                 killpid(cd->pid, SIGTERM);
 374                                 break;
 375                         }
 376                 }
 377
 378                 info("PLUGINSD: '%s' on pid %d stopped.", cd->fullfilename, cd->pid);
 379
 380                 // fgets() failed or loop broke
 381                 mypclose(fp, cd->pid);
 382
 383                 if(unlikely(!count && cd->enabled)) {
 384                         error("PLUGINSD: '%s' (pid %d) does not generate usefull output. Waiting a bit before starting it again.", cd->fullfilename, cd->pid);
 385                         sleep(cd->update_every * 10);
 386                 }
 387
 388                 cd->pid = 0;
 389
 390                 if(likely(cd->enabled)) sleep(cd->update_every);
 391                 else break;
 392         }
 393
 394         cd->obsolete = 1;
 395         return NULL;
 396 }
 397
 398 void *pluginsd_main(void *ptr)
 399 {
 400         if(ptr) { ; }
 401
 402         info("PLUGINS.D thread created with task id %d", gettid());
 403
 404         if(pthread_setcanceltype(PTHREAD_CANCEL_DEFERRED, NULL) != 0)
 405                 error("Cannot set pthread cancel type to DEFERRED.");
 406
 407         if(pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL) != 0)
 408                 error("Cannot set pthread cancel state to ENABLE.");
 409
 410         char *dir_name = config_get("plugins", "plugins directory", PLUGINS_DIR);
 411         int automatic_run = config_get_boolean("plugins", "enable running new plugins", 1);
 412         int scan_frequency = config_get_number("plugins", "check for new plugins every", 60);
 413         DIR *dir = NULL;
 414         struct dirent *file = NULL;
 415         struct plugind *cd;
 416
 417         // enable the apps plugin by default
 418         // config_get_boolean("plugins", "apps", 1);
 419
 420         if(scan_frequency < 1) scan_frequency = 1;
 421
 422         while(likely(1)) {
 423                 dir = opendir(dir_name);
 424                 if(unlikely(!dir)) {
 425                         error("Cannot open directory '%s'.", dir_name);
 426                         return NULL;
 427                 }
 428
 429                 while(likely((file = readdir(dir)))) {
 430                         debug(D_PLUGINSD, "PLUGINSD: Examining file '%s'", file->d_name);
 431
 432                         if(unlikely(strcmp(file->d_name, ".") == 0 || strcmp(file->d_name, "..") == 0)) continue;
 433
 434                         int len = strlen(file->d_name);
 435                         if(unlikely(len <= (int)PLUGINSD_FILE_SUFFIX_LEN)) continue;
 436                         if(unlikely(strcmp(PLUGINSD_FILE_SUFFIX, &file->d_name[len - (int)PLUGINSD_FILE_SUFFIX_LEN]) != 0)) {
 437                                 debug(D_PLUGINSD, "PLUGINSD: File '%s' does not end in '%s'.", file->d_name, PLUGINSD_FILE_SUFFIX);
 438                                 continue;
 439                         }
 440
 441                         char pluginname[CONFIG_MAX_NAME + 1];
 442                         snprintf(pluginname, CONFIG_MAX_NAME, "%.*s", (int)(len - PLUGINSD_FILE_SUFFIX_LEN), file->d_name);
 443                         int enabled = config_get_boolean("plugins", pluginname, automatic_run);
 444
 445                         if(unlikely(!enabled)) {
 446                                 debug(D_PLUGINSD, "PLUGINSD: plugin '%s' is not enabled", file->d_name);
 447                                 continue;
 448                         }
 449
 450                         // check if it runs already
 451                         for(cd = pluginsd_root ; likely(cd) ; cd = cd->next) {
 452                                 if(unlikely(strcmp(cd->filename, file->d_name) == 0)) break;
 453                         }
 454                         if(likely(cd && !cd->obsolete)) {
 455                                 debug(D_PLUGINSD, "PLUGINSD: plugin '%s' is already running", cd->filename);
 456                                 continue;
 457                         }
 458
 459                         // it is not running
 460                         // allocate a new one, or use the obsolete one
 461                         if(unlikely(!cd)) {
 462                                 cd = calloc(sizeof(struct plugind), 1);
 463                                 if(unlikely(!cd)) fatal("Cannot allocate memory for plugin.");
 464
 465                                 snprintf(cd->id, CONFIG_MAX_NAME, "plugin:%s", pluginname);
 466
 467                                 strncpy(cd->filename, file->d_name, FILENAME_MAX);
 468                                 snprintf(cd->fullfilename, FILENAME_MAX, "%s/%s", dir_name, cd->filename);
 469
 470                                 cd->enabled = enabled;
 471                                 cd->update_every = config_get_number(cd->id, "update every", rrd_update_every);
 472                                 cd->started_t = time(NULL);
 473
 474                                 char *def = "";
 475                                 snprintf(cd->cmd, PLUGINSD_CMD_MAX, "exec %s %d %s", cd->fullfilename, cd->update_every, config_get(cd->id, "command options", def));
 476
 477                                 // link it
 478                                 if(likely(pluginsd_root)) cd->next = pluginsd_root;
 479                                 pluginsd_root = cd;
 480                         }
 481                         cd->obsolete = 0;
 482
 483                         if(unlikely(!cd->enabled)) continue;
 484
 485                         // spawn a new thread for it
 486                         if(unlikely(pthread_create(&cd->thread, NULL, pluginsd_worker_thread, cd) != 0)) {
 487                                 error("PLUGINSD: failed to create new thread for plugin '%s'.", cd->filename);
 488                                 cd->obsolete = 1;
 489                         }
 490                         else if(unlikely(pthread_detach(cd->thread) != 0))
 491                                 error("PLUGINSD: Cannot request detach of newly created thread for plugin '%s'.", cd->filename);
 492                 }
 493
 494                 closedir(dir);
 495                 sleep(scan_frequency);
 496         }
 497
 498         return NULL;
 499 }
 500
 501