src/plugins_d.c

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