prometheus/burrow-prometheus.c

   1 /*
   2  *      A gateway between MQTT and Prometheus
   3  *
   4  *      (c) 2018--2019 Martin Mares <mj@ucw.cz>
   5  */
   6
   7 #include <ucw/lib.h>
   8 #include <ucw/fastbuf.h>
   9 #include <ucw/log.h>
  10 #include <ucw/mempool.h>
  11 #include <ucw/opt.h>
  12 #include <ucw/string.h>
  13
  14 #include <netinet/in.h>
  15 #include <pthread.h>
  16 #include <stdarg.h>
  17 #include <stdio.h>
  18 #include <stdlib.h>
  19 #include <string.h>
  20 #include <sys/poll.h>
  21 #include <sys/socket.h>
  22 #include <syslog.h>
  23 #include <time.h>
  24 #include <unistd.h>
  25
  26 #include <mosquitto.h>
  27
  28 #define MEASUREMENT_TIMEOUT 120
  29
  30 static struct mosquitto *mosq;
  31
  32 struct attr {
  33         const char *metric;
  34         const char *help;
  35         const char *type;
  36         const char *topic;
  37 };
  38
  39 static const struct attr attr_table[] = {
  40         {
  41                 .metric = "temp_loft",
  42                 .help = "Temperature in the loft [degC]",
  43                 .type = "gauge",
  44                 .topic = "burrow/temp/loft",
  45         },
  46         {
  47                 .metric = "loft_fan",
  48                 .help = "Fan speed in the loft (0-3)",
  49                 .type = "gauge",
  50                 .topic = "burrow/loft/fan"
  51         },
  52         {
  53                 .metric = "loft_circ",
  54                 .help = "Warm water circulation (0-1)",
  55                 .type = "gauge",
  56                 .topic = "burrow/loft/circulation"
  57         },
  58         {
  59                 .metric = "temp_ursarium",
  60                 .help = "Temperature in the Ursarium [degC]",
  61                 .type = "gauge",
  62                 .topic = "burrow/temp/ursarium"
  63         },
  64         {
  65                 .metric = "temp_catarium",
  66                 .help = "Temperature in the Catarium [degC]",
  67                 .type = "gauge",
  68                 .topic = "burrow/temp/catarium"
  69         },
  70         {
  71                 .metric = "temp_garage",
  72                 .help = "Temperature in the garage [degC]",
  73                 .type = "gauge",
  74                 .topic = "burrow/temp/garage"
  75         },
  76         {
  77                 .metric = "temp_kitchen",
  78                 .help = "Temperature in the kitchen [degC]",
  79                 .type = "gauge",
  80                 .topic = "burrow/temp/kitchen"
  81         },
  82         {
  83                 .metric = "rh_ursarium",
  84                 .help = "Relative humidity in the Ursarium [%]",
  85                 .type = "gauge",
  86                 .topic = "burrow/temp/ursarium-rh"
  87         },
  88         {
  89                 .metric = "temp_catarium_clock",
  90                 .help = "Temperature on Catarium clock [degC]",
  91                 .type = "gauge",
  92                 .topic = "burrow/temp/clock"
  93         },
  94         {
  95                 .metric = "press_catarium_clock",
  96                 .help = "Pressure on Catarium clock [Pa]",
  97                 .type = "gauge",
  98                 .topic = "burrow/pressure/clock"
  99         },
 100         {
 101                 .metric = "air_inside_intake",
 102                 .help = "Temperature of air intake from inside [degC]",
 103                 .type = "gauge",
 104                 .topic = "burrow/air/inside-intake",
 105         },
 106         {
 107                 .metric = "air_inside_exhaust",
 108                 .help = "Temperature of air exhaust to inside [degC]",
 109                 .type = "gauge",
 110                 .topic = "burrow/air/inside-exhaust",
 111         },
 112         {
 113                 .metric = "air_outside_intake",
 114                 .help = "Temperature of air intake from outside [degC]",
 115                 .type = "gauge",
 116                 .topic = "burrow/air/outside-intake",
 117         },
 118         {
 119                 .metric = "air_outside_exhaust",
 120                 .help = "Temperature of air exhaust to outside [degC]",
 121                 .type = "gauge",
 122                 .topic = "burrow/air/outside-exhaust",
 123         },
 124         {
 125                 .metric = "air_mixed",
 126                 .help = "Temperature of mixed air [degC]",
 127                 .type = "gauge",
 128                 .topic = "burrow/air/mixed",
 129         },
 130         {
 131                 .metric = "air_bypass",
 132                 .help = "Heat exchanger bypass (0-1)",
 133                 .type = "gauge",
 134                 .topic = "burrow/air/bypass"
 135         },
 136         {
 137                 .metric = "air_fan_pwm",
 138                 .help = "Heat exchanger fan PWM (0-255)",
 139                 .type = "gauge",
 140                 .topic = "burrow/air/exchanger-fan"
 141         },
 142         {
 143                 // Common heading for all voltages
 144                 .metric = "pm_voltage",
 145                 .help = "Voltage between phases and neutral [V]",
 146                 .type = "gauge",
 147         },
 148         {
 149                 .metric = "pm_voltage{phase=\"L1N\"}",
 150                 .topic = "burrow/power/voltage/l1n",
 151         },
 152         {
 153                 .metric = "pm_voltage{phase=\"L2N\"}",
 154                 .topic = "burrow/power/voltage/l2n",
 155         },
 156         {
 157                 .metric = "pm_voltage{phase=\"L3N\"}",
 158                 .topic = "burrow/power/voltage/l3n",
 159         },
 160         {
 161                 // Common heading for all currents
 162                 .metric = "pm_current",
 163                 .help = "Current through phases [A]",
 164                 .type = "gauge",
 165         },
 166         {
 167                 .metric = "pm_current{phase=\"L1\"}",
 168                 .topic = "burrow/power/current/l1",
 169         },
 170         {
 171                 .metric = "pm_current{phase=\"L2\"}",
 172                 .topic = "burrow/power/current/l2",
 173         },
 174         {
 175                 .metric = "pm_current{phase=\"L3\"}",
 176                 .topic = "burrow/power/current/l3",
 177         },
 178         {
 179                 .metric = "pm_power",
 180                 .help = "Total power [W]",
 181                 .type = "gauge",
 182                 .topic = "burrow/power/power",
 183         },
 184         {
 185                 .metric = "pm_energy",
 186                 .help = "Total energy [kWh]",
 187                 .type = "gauge",
 188                 .topic = "burrow/power/energy",
 189         },
 190         {
 191                 .metric = "pm_reactive_power",
 192                 .help = "Total reactive power [VAr]",
 193                 .type = "gauge",
 194                 .topic = "burrow/power/reactive/power",
 195         },
 196         {
 197                 .metric = "pm_reactive_energy",
 198                 .help = "Total reactive energy [kVArh]",
 199                 .type = "gauge",
 200                 .topic = "burrow/power/reactive/energy",
 201         },
 202 };
 203
 204 static char *attr_values[ARRAY_SIZE(attr_table)];
 205 static pthread_mutex_t attr_mutex = PTHREAD_MUTEX_INITIALIZER;
 206
 207 static void mqtt_publish(const char *topic, const char *fmt, ...)
 208 {
 209         va_list args;
 210         va_start(args, fmt);
 211         char m[256];
 212         int l = vsnprintf(m, sizeof(m), fmt, args);
 213         if (mosquitto_publish(mosq, NULL, topic, l, m, 0, true) != MOSQ_ERR_SUCCESS)
 214                 msg(L_ERROR, "Mosquitto: publish failed");
 215         va_end(args);
 216 }
 217
 218 static void mqtt_conn_callback(struct mosquitto *mosq UNUSED, void *obj UNUSED, int status)
 219 {
 220         if (!status) {
 221                 msg(L_DEBUG, "MQTT: Connection established, subscribing");
 222                 if (mosquitto_subscribe(mosq, NULL, "burrow/#", 1) != MOSQ_ERR_SUCCESS)
 223                         die("Mosquitto: subscribe failed");
 224
 225                 mqtt_publish("status/prometheus", "ok");
 226         }
 227 }
 228
 229 static void mqtt_log_callback(struct mosquitto *mosq UNUSED, void *obj UNUSED, int level, const char *message)
 230 {
 231         // msg(L_INFO, "MQTT(%d): %s", level, message);
 232 }
 233
 234 static void mqtt_msg_callback(struct mosquitto *mosq UNUSED, void *obj UNUSED, const struct mosquitto_message *m)
 235 {
 236         char val[256];
 237         if (m->payloadlen >= sizeof(val) - 1) {
 238                 msg(L_ERROR, "Invalid value for topic %s", m->topic);
 239                 return;
 240         }
 241         memcpy(val, m->payload, m->payloadlen);
 242         val[m->payloadlen] = 0;
 243         msg(L_DEBUG, "MQTT < %s %s", m->topic, val);
 244
 245         for (uint i=0; i < ARRAY_SIZE(attr_table); i++) {
 246                 if (attr_table[i].topic && !strcmp(attr_table[i].topic, m->topic)) {
 247                         pthread_mutex_lock(&attr_mutex);
 248                         if (attr_values[i]) {
 249                                 xfree(attr_values[i]);
 250                                 attr_values[i] = NULL;
 251                         }
 252                         if (val[0])
 253                                 attr_values[i] = xstrdup(val);
 254                         pthread_mutex_unlock(&attr_mutex);
 255                 }
 256         }
 257 }
 258
 259 struct http {
 260         struct mempool *mp;
 261         int sk;
 262         char *iobuf;
 263         uint iobuf_pos, iobuf_max;
 264         char *linebuf;
 265         struct fbpool fbpool;
 266 };
 267
 268 #define IO_TIMEOUT 60000        // in ms
 269 #define IOBUF_SIZE 1024
 270 #define LINEBUF_SIZE 1024
 271
 272 static void http_send(struct http *http)
 273 {
 274         byte *buf = fbpool_end(&http->fbpool);
 275         uint len = mp_size(http->mp, buf);
 276
 277         while (len) {
 278                 struct pollfd pfd = { .fd = http->sk, .events = POLLOUT, .revents = 0 };
 279                 int res = poll(&pfd, 1, IO_TIMEOUT);
 280                 if (res < 0)
 281                         die("Poll failed: %m");
 282                 if (!res) {
 283                         msg(L_ERROR, "HTTP write timed out");
 284                         return;
 285                 }
 286
 287                 res = write(http->sk, buf, len);
 288                 if (res < 0) {
 289                         msg(L_ERROR, "HTTP write failed: %m");
 290                         return;
 291                 }
 292                 buf += res;
 293                 len -= res;
 294         }
 295 }
 296
 297 static void http_error(struct http *http, const char *err)
 298 {
 299         msg(L_INFO, "HTTP error: %s", err);
 300         fbpool_start(&http->fbpool, http->mp, 0);
 301         bprintf(&http->fbpool.fb, "HTTP/1.1 %s\r\n", err);
 302         http_send(http);
 303 }
 304
 305 static int http_get_char(struct http *http) {
 306         if (http->iobuf_pos >= http->iobuf_max) {
 307                 struct pollfd pfd = { .fd = http->sk, .events = POLLIN, .revents = 0 };
 308                 int res = poll(&pfd, 1, IO_TIMEOUT);
 309                 if (res < 0)
 310                         die("Poll failed: %m");
 311                 if (!res) {
 312                         msg(L_ERROR, "HTTP read timed out");
 313                         return -1;
 314                 }
 315                 int len = read(http->sk, http->iobuf, IOBUF_SIZE);
 316                 if (len < 0) {
 317                         msg(L_ERROR, "HTTP read error: %m");
 318                         return -1;
 319                 }
 320                 if (!len) {
 321                         msg(L_ERROR, "HTTP connection closed");
 322                         return -1;
 323                 }
 324                 http->iobuf_pos = 0;
 325                 http->iobuf_max = len;
 326         }
 327         return http->iobuf[http->iobuf_pos++];
 328 }
 329
 330 static bool http_get_line(struct http *http)
 331 {
 332         uint i = 0;
 333         for (;;) {
 334                 int c = http_get_char(http);
 335                 if (c < 0)
 336                         return false;
 337                 if (c == '\n') {
 338                         if (i > 0 && http->linebuf[i-1] == '\r')
 339                                 i--;
 340                         http->linebuf[i] = 0;
 341                         return true;
 342                 }
 343                 if (i >= IOBUF_SIZE-1) {
 344                         http_error(http, "400 Line too long");
 345                         return false;
 346                 }
 347                 http->linebuf[i++] = c;
 348         }
 349 }
 350
 351 static void http_answer(struct fastbuf *fb)
 352 {
 353         char val[256], *w[2];
 354         time_t now = time(NULL);
 355
 356         for (uint i=0; i < ARRAY_SIZE(attr_table); i++) {
 357                 const struct attr *a = &attr_table[i];
 358
 359                 pthread_mutex_lock(&attr_mutex);
 360                 snprintf(val, sizeof(val), "%s", attr_values[i] ? : "");
 361                 pthread_mutex_unlock(&attr_mutex);
 362
 363                 if (a->help)
 364                         bprintf(fb, "# HELP %s %s\n", a->metric, a->help);
 365                 if (a->type)
 366                         bprintf(fb, "# TYPE %s %s\n", a->metric, a->type);
 367
 368                 if (!val[0])
 369                         continue;
 370                 int fields = str_wordsplit(val, w, ARRAY_SIZE(w));
 371                 if (fields < 1)
 372                         continue;
 373                 if (fields >= 2) {
 374                         time_t t = atoll(w[1]);
 375                         if (t < now - MEASUREMENT_TIMEOUT)
 376                                 continue;
 377                 }
 378
 379                 if (a->topic) {
 380                         bprintf(fb, "%s %s", a->metric, val);
 381 #if 0
 382                         // Prometheus does not like our timestamps -- why?
 383                         if (fields >= 2)
 384                                 bprintf(fb, " %s", w[1]);
 385 #endif
 386                         bputc(fb, '\n');
 387                 }
 388         }
 389 }
 390
 391 static void http_connection(struct http *http)
 392 {
 393         http->iobuf = mp_alloc(http->mp, IOBUF_SIZE);
 394         http->linebuf = mp_alloc(http->mp, LINEBUF_SIZE);
 395         fbpool_init(&http->fbpool);
 396
 397         if (!http_get_line(http))
 398                 return;
 399         // msg(L_DEBUG, "Request line: <%s>", http->linebuf);
 400         char *words[3];
 401         if (str_wordsplit(http->linebuf, words, 3) != 3) {
 402                 http_error(http, "400 Invalid request line");
 403                 return;
 404         }
 405         if (strcmp(words[0], "GET")) {
 406                 http_error(http, "501 Method not implemented");
 407                 return;
 408         }
 409
 410         for (;;) {
 411                 if (!http_get_line(http))
 412                         return;
 413                 if (!http->linebuf[0])
 414                         break;
 415                 // msg(L_DEBUG, "Header line: <%s>", http->linebuf);
 416         }
 417
 418         fbpool_start(&http->fbpool, http->mp, 0);
 419         struct fastbuf *fb = &http->fbpool.fb;
 420         bprintf(fb, "HTTP/1.1 200 OK\r\n");
 421         bprintf(fb, "Content-type: text/plain; version=0.0.4\r\n");
 422         bprintf(fb, "\r\n");
 423         http_answer(fb);
 424         http_send(http);
 425 }
 426
 427 static int use_daemon;
 428 static int use_debug;
 429
 430 static struct opt_section options = {
 431         OPT_ITEMS {
 432                 OPT_HELP("A daemon for controlling the solid state relay module via MQTT"),
 433                 OPT_HELP(""),
 434                 OPT_HELP("Options:"),
 435                 OPT_BOOL('d', "debug", use_debug, 0, "\tLog debugging messages"),
 436                 OPT_BOOL(0, "daemon", use_daemon, 0, "\tDaemonize"),
 437                 OPT_HELP_OPTION,
 438                 OPT_CONF_OPTIONS,
 439                 OPT_END
 440         }
 441 };
 442
 443 int main(int argc UNUSED, char **argv)
 444 {
 445         log_init(argv[0]);
 446         opt_parse(&options, argv+1);
 447
 448         if (use_daemon) {
 449                 struct log_stream *ls = log_new_syslog("daemon", LOG_PID);
 450                 log_set_default_stream(ls);
 451         }
 452         if (!use_debug)
 453                 log_default_stream()->levels &= ~(1U << L_DEBUG);
 454
 455         mosquitto_lib_init();
 456         mosq = mosquitto_new("prometheus", 1, NULL);
 457         if (!mosq)
 458                 die("Mosquitto: initialization failed");
 459
 460         mosquitto_connect_callback_set(mosq, mqtt_conn_callback);
 461         mosquitto_log_callback_set(mosq, mqtt_log_callback);
 462         mosquitto_message_callback_set(mosq, mqtt_msg_callback);
 463
 464         if (mosquitto_will_set(mosq, "status/prometheus", 4, "dead", 0, true) != MOSQ_ERR_SUCCESS)
 465                 die("Mosquitto: unable to set will");
 466
 467         if (mosquitto_connect_async(mosq, "10.32.184.5", 1883, 60) != MOSQ_ERR_SUCCESS)
 468                 die("Mosquitto: connect failed");
 469
 470         if (mosquitto_loop_start(mosq))
 471                 die("Mosquitto: cannot start service thread");
 472
 473         int listen_sk = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
 474         if (listen_sk < 0)
 475                 die("Cannot create listening socket: %m");
 476
 477         int one = 1;
 478         if (setsockopt(listen_sk, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one)) < 0)
 479                 die("Cannot set SO_REUSEADDR: %m");
 480
 481         struct sockaddr_in sin = { .sin_family = AF_INET, .sin_port = htons(1422), .sin_addr = INADDR_ANY };
 482         if (bind(listen_sk, (const struct sockaddr *) &sin, sizeof(sin)) < 0)
 483                 die("Cannot bind listening socket: %m");
 484
 485         if (listen(listen_sk, 64) < 0)
 486                 die("Cannot listen: %m");
 487
 488         for (;;) {
 489                 int sk = accept(listen_sk, NULL, NULL);
 490                 if (sk < 0) {
 491                         msg(L_ERROR, "HTTP accept failed: %m");
 492                         continue;
 493                 }
 494                 msg(L_DEBUG, "HTTP accepted connection");
 495                 struct mempool *mp = mp_new(4096);
 496                 struct http *http = mp_alloc_zero(mp, sizeof(*http));
 497                 http->mp = mp;
 498                 http->sk = sk;
 499                 http_connection(http);
 500                 mp_delete(mp);
 501                 close(sk);
 502         }
 503 }