stats.c 30.8 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12
/* Icecast
 *
 * This program is distributed under the GNU General Public License, version 2.
 * A copy of this license is included with this source.
 *
 * Copyright 2000-2004, Jack Moffitt <jack@xiph.org, 
 *                      Michael Smith <msmith@xiph.org>,
 *                      oddsock <oddsock@xiph.org>,
 *                      Karl Heyes <karl@xiph.org>
 *                      and others (see AUTHORS for details).
 */

13 14 15 16
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

Jack Moffitt's avatar
Jack Moffitt committed
17 18 19 20 21
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <stdarg.h>

Michael Smith's avatar
Michael Smith committed
22 23 24
#include <libxml/xmlmemory.h>
#include <libxml/parser.h>
#include <libxml/tree.h>
Jack Moffitt's avatar
Jack Moffitt committed
25

26 27 28 29
#include "thread/thread.h"
#include "avl/avl.h"
#include "httpp/httpp.h"
#include "net/sock.h"
Jack Moffitt's avatar
Jack Moffitt committed
30 31 32

#include "connection.h"

33
#include "source.h"
Jack Moffitt's avatar
Jack Moffitt committed
34 35 36 37
#include "global.h"
#include "refbuf.h"
#include "client.h"
#include "stats.h"
38
#include "xslt.h"
39
#include "util.h"
40 41
#define CATMODULE "stats"
#include "logging.h"
Jack Moffitt's avatar
Jack Moffitt committed
42

43
#ifdef _WIN32
44
#define vsnprintf _vsnprintf
45
#define snprintf _snprintf
46
#endif
Jack Moffitt's avatar
Jack Moffitt committed
47

48 49 50 51
#define STATS_EVENT_SET     0
#define STATS_EVENT_INC     1
#define STATS_EVENT_DEC     2
#define STATS_EVENT_ADD     3
Karl Heyes's avatar
Karl Heyes committed
52 53 54
#define STATS_EVENT_SUB     4
#define STATS_EVENT_REMOVE  5
#define STATS_EVENT_HIDDEN  6
55

56 57 58 59 60 61 62 63
typedef struct _event_queue_tag
{
    volatile stats_event_t *head;
    volatile stats_event_t **tail;
} event_queue_t;

#define event_queue_init(qp)    { (qp)->head = NULL; (qp)->tail = &(qp)->head; }

Jack Moffitt's avatar
Jack Moffitt committed
64 65
typedef struct _event_listener_tag
{
66 67
    event_queue_t queue;
    mutex_t mutex;
Jack Moffitt's avatar
Jack Moffitt committed
68

69
    struct _event_listener_tag *next;
Jack Moffitt's avatar
Jack Moffitt committed
70 71
} event_listener_t;

72
static volatile int _stats_running = 0;
73
static thread_type *_stats_thread_id;
74
static volatile int _stats_threads = 0;
Jack Moffitt's avatar
Jack Moffitt committed
75

76 77
static stats_t _stats;
static mutex_t _stats_mutex;
Jack Moffitt's avatar
Jack Moffitt committed
78

79
static event_queue_t _global_event_queue;
Jack Moffitt's avatar
Jack Moffitt committed
80 81
mutex_t _global_event_mutex;

82
static volatile event_listener_t *_event_listeners;
Jack Moffitt's avatar
Jack Moffitt committed
83 84 85 86 87 88 89


static void *_stats_thread(void *arg);
static int _compare_stats(void *a, void *b, void *arg);
static int _compare_source_stats(void *a, void *b, void *arg);
static int _free_stats(void *key);
static int _free_source_stats(void *key);
90
static void _add_event_to_queue(stats_event_t *event, event_queue_t *queue);
91 92
static stats_node_t *_find_node(avl_tree *tree, const char *name);
static stats_source_t *_find_source(avl_tree *tree, const char *source);
Jack Moffitt's avatar
Jack Moffitt committed
93
static void _free_event(stats_event_t *event);
94
static stats_event_t *_get_event_from_queue (event_queue_t *queue);
Jack Moffitt's avatar
Jack Moffitt committed
95

96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119

/* simple helper function for creating an event */
static stats_event_t *build_event (const char *source, const char *name, const char *value)
{
    stats_event_t *event;

    event = (stats_event_t *)calloc(1, sizeof(stats_event_t));
    if (event)
    {
        if (source)
            event->source = (char *)strdup(source);
        if (name)
            event->name = (char *)strdup(name);
        if (value)
            event->value = (char *)strdup(value);
        else
            event->action = STATS_EVENT_REMOVE;
    }
    return event;
}

static void queue_global_event (stats_event_t *event)
{
    thread_mutex_lock(&_global_event_mutex);
120
    _add_event_to_queue (event, &_global_event_queue);
121 122 123
    thread_mutex_unlock(&_global_event_mutex);
}

124
void stats_initialize(void)
Jack Moffitt's avatar
Jack Moffitt committed
125
{
126
    _event_listeners = NULL;
127

128 129 130
    /* set up global struct */
    _stats.global_tree = avl_tree_new(_compare_stats, NULL);
    _stats.source_tree = avl_tree_new(_compare_source_stats, NULL);
Jack Moffitt's avatar
Jack Moffitt committed
131

132 133
    /* set up global mutex */
    thread_mutex_create(&_stats_mutex);
Jack Moffitt's avatar
Jack Moffitt committed
134

135
    /* set up stats queues */
136
    event_queue_init (&_global_event_queue);
137
    thread_mutex_create(&_global_event_mutex);
Jack Moffitt's avatar
Jack Moffitt committed
138

139 140 141
    /* fire off the stats thread */
    _stats_running = 1;
    _stats_thread_id = thread_create("Stats Thread", _stats_thread, NULL, THREAD_ATTACHED);
Jack Moffitt's avatar
Jack Moffitt committed
142 143
}

144
void stats_shutdown(void)
Jack Moffitt's avatar
Jack Moffitt committed
145
{
146
    int n;
Jack Moffitt's avatar
Jack Moffitt committed
147

148 149 150
    if(!_stats_running) /* We can't shutdown if we're not running. */
        return;

151 152 153
    /* wait for thread to exit */
    _stats_running = 0;
    thread_join(_stats_thread_id);
Jack Moffitt's avatar
Jack Moffitt committed
154

155 156 157 158 159 160 161
    /* wait for other threads to shut down */
    do {
        thread_sleep(300000);
        thread_mutex_lock(&_stats_mutex);
        n = _stats_threads;
        thread_mutex_unlock(&_stats_mutex);
    } while (n > 0);
162
    INFO0("stats thread finished");
163

164
    /* free the queues */
Jack Moffitt's avatar
Jack Moffitt committed
165

166 167
    /* destroy the queue mutexes */
    thread_mutex_destroy(&_global_event_mutex);
Jack Moffitt's avatar
Jack Moffitt committed
168

169 170 171
    thread_mutex_destroy(&_stats_mutex);
    avl_tree_free(_stats.source_tree, _free_source_stats);
    avl_tree_free(_stats.global_tree, _free_stats);
172

173 174 175 176
    while (1)
    {
        stats_event_t *event = _get_event_from_queue (&_global_event_queue);
        if (event == NULL) break;
177 178 179 180
        if(event->source)
            free(event->source);
        if(event->value)
            free(event->value);
181 182
        if(event->name)
            free(event->name);
183 184
        free(event);
    }
Jack Moffitt's avatar
Jack Moffitt committed
185 186
}

187
stats_t *stats_get_stats(void)
Jack Moffitt's avatar
Jack Moffitt committed
188
{
189 190 191
    /* lock global stats
    
     copy stats
Jack Moffitt's avatar
Jack Moffitt committed
192

193
     unlock global stats
Jack Moffitt's avatar
Jack Moffitt committed
194

195
     return copied stats */
Jack Moffitt's avatar
Jack Moffitt committed
196

197
    return NULL;
Jack Moffitt's avatar
Jack Moffitt committed
198 199
}

200 201
/* simple name=tag stat create/update */
void stats_event(const char *source, const char *name, const char *value)
Jack Moffitt's avatar
Jack Moffitt committed
202
{
203 204
    stats_event_t *event;

205 206 207 208 209
    if (value && xmlCheckUTF8 ((unsigned char *)value) == 0)
    {
        WARN2 ("seen non-UTF8 data, probably incorrect metadata (%s, %s)", name, value);
        return;
    }
210 211 212
    event = build_event (source, name, value);
    if (event)
        queue_global_event (event);
Jack Moffitt's avatar
Jack Moffitt committed
213 214
}

215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242

/* wrapper for stats_event, this takes a charset to convert from */
void stats_event_conv(const char *mount, const char *name, const char *value, const char *charset)
{
    const char *metadata = value;
    xmlBufferPtr conv = xmlBufferCreate ();

    if (charset)
    {
        xmlCharEncodingHandlerPtr handle = xmlFindCharEncodingHandler (charset);

        if (handle)
        {
            xmlBufferPtr raw = xmlBufferCreate ();
            xmlBufferAdd (raw, (const xmlChar *)value, strlen (value));
            if (xmlCharEncInFunc (handle, conv, raw) > 0)
                metadata = (char *)xmlBufferContent (conv);
            xmlBufferFree (raw);
            xmlCharEncCloseFunc (handle);
        }
        else
            WARN1 ("No charset found for \"%s\"", charset);
    }

    stats_event (mount, name, metadata);
    xmlBufferFree (conv);
}

243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258
/* make stat hidden (non-zero). name can be NULL if it applies to a whole
 * source stats tree. */
void stats_event_hidden (const char *source, const char *name, int hidden)
{
    stats_event_t *event;
    const char *str = NULL;

    if (hidden)
        str = "";
    event = build_event (source, name, str);
    if (event)
    {
        event->action = STATS_EVENT_HIDDEN;
        queue_global_event (event);
    }
}
259 260 261

/* printf style formatting for stat create/update */
void stats_event_args(const char *source, char *name, char *format, ...)
Jack Moffitt's avatar
Jack Moffitt committed
262
{
263 264
    char buf[1024];
    va_list val;
265 266 267 268
    int ret;

    if (name == NULL)
        return;
269
    va_start(val, format);
270
    ret = vsnprintf(buf, 1024, format, val);
271
    va_end(val);
Jack Moffitt's avatar
Jack Moffitt committed
272

273 274 275 276 277 278
    if (ret < 0 || (unsigned int)ret >= sizeof (buf))
    {
        WARN2 ("problem with formatting %s stat %s",
                source==NULL ? "global" : source, name);
        return;
    }
279
    stats_event(source, name, buf);
Jack Moffitt's avatar
Jack Moffitt committed
280 281
}

282
static char *_get_stats(const char *source, const char *name)
Jack Moffitt's avatar
Jack Moffitt committed
283
{
284 285 286
    stats_node_t *stats = NULL;
    stats_source_t *src = NULL;
    char *value = NULL;
Jack Moffitt's avatar
Jack Moffitt committed
287

288
    thread_mutex_lock(&_stats_mutex);
Jack Moffitt's avatar
Jack Moffitt committed
289

290 291 292 293 294 295 296 297
    if (source == NULL) {
        stats = _find_node(_stats.global_tree, name);
    } else {
        src = _find_source(_stats.source_tree, source);
        if (src) {
            stats = _find_node(src->stats_tree, name);
        }
    }
Jack Moffitt's avatar
Jack Moffitt committed
298

299
    if (stats) value = (char *)strdup(stats->value);
Jack Moffitt's avatar
Jack Moffitt committed
300

301
    thread_mutex_unlock(&_stats_mutex);
Jack Moffitt's avatar
Jack Moffitt committed
302

303
    return value;
Jack Moffitt's avatar
Jack Moffitt committed
304 305
}

306
char *stats_get_value(const char *source, const char *name)
307
{
308
    return(_get_stats(source, name));
309
}
310 311 312

/* increase the value in the provided stat by 1 */
void stats_event_inc(const char *source, const char *name)
Jack Moffitt's avatar
Jack Moffitt committed
313
{
314 315 316 317 318 319
    stats_event_t *event = build_event (source, name, NULL);
    /* DEBUG2("%s on %s", name, source==NULL?"global":source); */
    if (event)
    {
        event->action = STATS_EVENT_INC;
        queue_global_event (event);
320
    }
Jack Moffitt's avatar
Jack Moffitt committed
321 322
}

323
void stats_event_add(const char *source, const char *name, unsigned long value)
Jack Moffitt's avatar
Jack Moffitt committed
324
{
325 326 327 328 329 330 331 332
    stats_event_t *event = build_event (source, name, NULL);
    /* DEBUG2("%s on %s", name, source==NULL?"global":source); */
    if (event)
    {
        event->value = malloc (16);
        snprintf (event->value, 16, "%ld", value);
        event->action = STATS_EVENT_ADD;
        queue_global_event (event);
333
    }
Jack Moffitt's avatar
Jack Moffitt committed
334 335
}

Karl Heyes's avatar
Karl Heyes committed
336 337 338 339 340 341 342 343 344 345 346 347
void stats_event_sub(const char *source, const char *name, unsigned long value)
{
    stats_event_t *event = build_event (source, name, NULL);
    if (event)
    {
        event->value = malloc (16);
        snprintf (event->value, 16, "%ld", value);
        event->action = STATS_EVENT_SUB;
        queue_global_event (event);
    }
}

348 349
/* decrease the value in the provided stat by 1 */
void stats_event_dec(const char *source, const char *name)
Jack Moffitt's avatar
Jack Moffitt committed
350
{
351 352 353 354 355 356
    /* DEBUG2("%s on %s", name, source==NULL?"global":source); */
    stats_event_t *event = build_event (source, name, NULL);
    if (event)
    {
        event->action = STATS_EVENT_DEC;
        queue_global_event (event);
357
    }
Jack Moffitt's avatar
Jack Moffitt committed
358 359 360 361 362
}

/* note: you must call this function only when you have exclusive access
** to the avl_tree
*/
363
static stats_node_t *_find_node(avl_tree *stats_tree, const char *name)
Jack Moffitt's avatar
Jack Moffitt committed
364
{
365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384
    stats_node_t *stats;
    avl_node *node;
    int cmp;

    /* get the root node */
    node = stats_tree->root->right;
    
    while (node) {
        stats = (stats_node_t *)node->key;
        cmp = strcmp(name, stats->name);
        if (cmp < 0) 
            node = node->left;
        else if (cmp > 0)
            node = node->right;
        else
            return stats;
    }
    
    /* didn't find it */
    return NULL;
Jack Moffitt's avatar
Jack Moffitt committed
385 386 387 388 389
}

/* note: you must call this function only when you have exclusive access
** to the avl_tree
*/
390
static stats_source_t *_find_source(avl_tree *source_tree, const char *source)
Jack Moffitt's avatar
Jack Moffitt committed
391
{
392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407
    stats_source_t *stats;
    avl_node *node;
    int cmp;

    /* get the root node */
    node = source_tree->root->right;
    while (node) {
        stats = (stats_source_t *)node->key;
        cmp = strcmp(source, stats->source);
        if (cmp < 0)
            node = node->left;
        else if (cmp > 0)
            node = node->right;
        else
            return stats;
    }
Jack Moffitt's avatar
Jack Moffitt committed
408

409 410
    /* didn't find it */
    return NULL;
Jack Moffitt's avatar
Jack Moffitt committed
411 412 413 414
}

static stats_event_t *_copy_event(stats_event_t *event)
{
415
    stats_event_t *copy = (stats_event_t *)calloc(1, sizeof(stats_event_t));
416 417 418 419
    if (event->source) 
        copy->source = (char *)strdup(event->source);
    else
        copy->source = NULL;
420 421
    if (event->name)
        copy->name = (char *)strdup(event->name);
422 423 424 425
    if (event->value)
        copy->value = (char *)strdup(event->value);
    else
        copy->value = NULL;
426
    copy->hidden = event->hidden;
427
    copy->next = NULL;
Jack Moffitt's avatar
Jack Moffitt committed
428

429
    return copy;
Jack Moffitt's avatar
Jack Moffitt committed
430 431
}

432 433 434 435 436 437

/* helper to apply specialised changes to a stats node */
static void modify_node_event (stats_node_t *node, stats_event_t *event)
{
    char *str;

438 439 440 441 442 443 444 445
    if (event->action == STATS_EVENT_HIDDEN)
    {
        if (event->value)
            node->hidden = 1;
        else
            node->hidden = 0;
        return;
    }
446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465
    if (event->action != STATS_EVENT_SET)
    {
        int value = 0;

        switch (event->action)
        {
            case STATS_EVENT_INC:
                value = atoi (node->value)+1;
                break;
            case STATS_EVENT_DEC:
                value = atoi (node->value)-1;
                break;
            case STATS_EVENT_ADD:
                value = atoi (node->value)+atoi (event->value);
                break;
            default:
                break;
        }
        str = malloc (16);
        snprintf (str, 16, "%d", value);
466 467
        if (event->value == NULL)
            event->value = strdup (str);
468 469 470 471 472
    }
    else
        str = (char *)strdup (event->value);
    free (node->value);
    node->value = str;
473 474 475 476
    if (event->source)
        DEBUG3 ("update \"%s\" %s (%s)", event->source, node->name, node->value);
    else
        DEBUG2 ("update global %s (%s)", node->name, node->value);
477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522
}


static void process_global_event (stats_event_t *event)
{
    stats_node_t *node;

    /* DEBUG3("global event %s %s %d", event->name, event->value, event->action); */
    if (event->action == STATS_EVENT_REMOVE)
    {
        /* we're deleting */
        node = _find_node(_stats.global_tree, event->name);
        if (node != NULL)
            avl_delete(_stats.global_tree, (void *)node, _free_stats);
        return;
    }
    node = _find_node(_stats.global_tree, event->name);
    if (node)
    {
        modify_node_event (node, event);
    }
    else
    {
        /* add node */
        node = (stats_node_t *)calloc(1, sizeof(stats_node_t));
        node->name = (char *)strdup(event->name);
        node->value = (char *)strdup(event->value);

        avl_insert(_stats.global_tree, (void *)node);
    }
}


static void process_source_event (stats_event_t *event)
{
    stats_source_t *snode = _find_source(_stats.source_tree, event->source);
    if (snode == NULL)
    {
        if (event->action == STATS_EVENT_REMOVE)
            return;
        snode = (stats_source_t *)calloc(1,sizeof(stats_source_t));
        if (snode == NULL)
            return;
        DEBUG1 ("new source stat %s", event->source);
        snode->source = (char *)strdup(event->source);
        snode->stats_tree = avl_tree_new(_compare_stats, NULL);
523 524 525 526
        if (event->action == STATS_EVENT_HIDDEN)
            snode->hidden = 1;
        else
            snode->hidden = 0;
527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543

        avl_insert(_stats.source_tree, (void *)snode);
    }
    if (event->name)
    {
        stats_node_t *node = _find_node(snode->stats_tree, event->name);
        if (node == NULL)
        {
            if (event->action == STATS_EVENT_REMOVE)
                return;
            /* adding node */
            if (event->value)
            {
                DEBUG2 ("new node %s (%s)", event->name, event->value);
                node = (stats_node_t *)calloc(1,sizeof(stats_node_t));
                node->name = (char *)strdup(event->name);
                node->value = (char *)strdup(event->value);
544
                node->hidden = snode->hidden;
545 546 547 548 549 550 551 552 553 554 555 556 557 558

                avl_insert(snode->stats_tree, (void *)node);
            }
            return;
        }
        if (event->action == STATS_EVENT_REMOVE)
        {
            DEBUG1 ("delete node %s", event->name);
            avl_delete(snode->stats_tree, (void *)node, _free_stats);
            return;
        }
        modify_node_event (node, event);
        return;
    }
559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574
    if (event->action == STATS_EVENT_HIDDEN)
    {
        avl_node *node = avl_get_first (snode->stats_tree);

        if (event->value)
            snode->hidden = 1;
        else
            snode->hidden = 0;
        while (node)
        {
            stats_node_t *stats = (stats_node_t*)node->key;
            stats->hidden = snode->hidden;
            node = avl_get_next (node);
        }
        return;
    }
575 576 577 578 579 580 581 582
    if (event->action == STATS_EVENT_REMOVE)
    {
        DEBUG1 ("delete source node %s", event->source);
        avl_delete(_stats.source_tree, (void *)snode, _free_source_stats);
    }
}


Karl Heyes's avatar
Karl Heyes committed
583 584 585
void stats_event_time (const char *mount, const char *name)
{
    time_t now = time(NULL);
586
    struct tm local;
Karl Heyes's avatar
Karl Heyes committed
587 588 589 590 591 592 593 594
    char buffer[100];

    localtime_r (&now, &local);
    strftime (buffer, sizeof (buffer), "%a, %d %b %Y %H:%M:%S %z", &local);
    stats_event (mount, name, buffer);
}


Karl Heyes's avatar
Karl Heyes committed
595 596
void stats_global (ice_config_t *config)
{
597
    stats_event (NULL, "server_id", config->server_id);
Karl Heyes's avatar
Karl Heyes committed
598 599 600 601 602 603
    stats_event (NULL, "host", config->hostname);
    stats_event (NULL, "location", config->location);
    stats_event (NULL, "admin", config->admin);
}


Jack Moffitt's avatar
Jack Moffitt committed
604 605
static void *_stats_thread(void *arg)
{
606 607 608 609
    stats_event_t *event;
    stats_event_t *copy;
    event_listener_t *listener;

Karl Heyes's avatar
Karl Heyes committed
610
    stats_event_time (NULL, "server_start");
611 612 613 614 615 616

    /* global currently active stats */
    stats_event (NULL, "clients", "0");
    stats_event (NULL, "connections", "0");
    stats_event (NULL, "sources", "0");
    stats_event (NULL, "stats", "0");
Karl Heyes's avatar
Karl Heyes committed
617
    stats_event (NULL, "listeners", "0");
618 619 620 621 622 623 624

    /* global accumulating stats */
    stats_event (NULL, "client_connections", "0");
    stats_event (NULL, "source_client_connections", "0");
    stats_event (NULL, "source_relay_connections", "0");
    stats_event (NULL, "source_total_connections", "0");
    stats_event (NULL, "stats_connections", "0");
625
    stats_event (NULL, "listener_connections", "0");
626 627

    INFO0 ("stats thread started");
628
    while (_stats_running) {
629
        if (_global_event_queue.head != NULL) {
630
            /* grab the next event from the queue */
631
            thread_mutex_lock(&_global_event_mutex);
632
            event = _get_event_from_queue (&_global_event_queue);
633 634
            thread_mutex_unlock(&_global_event_mutex);

635 636
            if (event == NULL)
                continue;
637 638 639
            event->next = NULL;

            thread_mutex_lock(&_stats_mutex);
640 641 642 643 644 645

            /* check if we are dealing with a global or source event */
            if (event->source == NULL)
                process_global_event (event);
            else
                process_source_event (event);
646 647 648
            
            /* now we have an event that's been processed into the running stats */
            /* this event should get copied to event listeners' queues */
649
            listener = (event_listener_t *)_event_listeners;
650 651
            while (listener) {
                copy = _copy_event(event);
652 653 654
                thread_mutex_lock (&listener->mutex);
                _add_event_to_queue (copy, &listener->queue);
                thread_mutex_unlock (&listener->mutex);
655 656 657 658 659 660 661 662

                listener = listener->next;
            }

            /* now we need to destroy the event */
            _free_event(event);

            thread_mutex_unlock(&_stats_mutex);
663
            continue;
664 665
        }

666
        thread_sleep(300000);
667 668 669
    }

    return NULL;
Jack Moffitt's avatar
Jack Moffitt committed
670 671
}

672
/* you must have the _stats_mutex locked here */
673
static void _unregister_listener(event_listener_t *listener)
674 675 676 677 678
{
    event_listener_t **prev = (event_listener_t **)&_event_listeners,
                     *current = *prev;
    while (current)
    {
679
        if (current == listener)
680 681 682 683 684 685 686 687 688 689
        {
            *prev = current->next;
            break;
        }
        prev = &current->next;
        current = *prev;
    }
}


Jack Moffitt's avatar
Jack Moffitt committed
690 691
static stats_event_t *_make_event_from_node(stats_node_t *node, char *source)
{
692 693 694 695 696 697 698 699
    stats_event_t *event = (stats_event_t *)malloc(sizeof(stats_event_t));
    
    if (source != NULL)
        event->source = (char *)strdup(source);
    else
        event->source = NULL;
    event->name = (char *)strdup(node->name);
    event->value = (char *)strdup(node->value);
700
    event->hidden = node->hidden;
701
    event->action = STATS_EVENT_SET;
702
    event->next = NULL;
Jack Moffitt's avatar
Jack Moffitt committed
703

704
    return event;
Jack Moffitt's avatar
Jack Moffitt committed
705 706 707
}


708 709 710 711
static void _add_event_to_queue(stats_event_t *event, event_queue_t *queue)
{
    *queue->tail = event;
    queue->tail = (volatile stats_event_t **)&event->next;
Jack Moffitt's avatar
Jack Moffitt committed
712 713 714
}


715 716 717
static stats_event_t *_get_event_from_queue (event_queue_t *queue)
{
    stats_event_t *event = NULL;
Jack Moffitt's avatar
Jack Moffitt committed
718

719 720 721 722 723 724 725
    if (queue && queue->head)
    {
        event = (stats_event_t *)queue->head;
        queue->head = event->next;
        if (queue->head == NULL)
            queue->tail = &queue->head;
    }
Jack Moffitt's avatar
Jack Moffitt committed
726

727
    return event;
Jack Moffitt's avatar
Jack Moffitt committed
728 729
}

730
static int _send_event_to_client(stats_event_t *event, client_t *client)
Jack Moffitt's avatar
Jack Moffitt committed
731
{
732
    int len;
733
    char buf [200];
Jack Moffitt's avatar
Jack Moffitt committed
734

735
    /* send data to the client!!!! */
736
    len = snprintf (buf, sizeof (buf), "EVENT %s %s %s\n",
737 738 739
            (event->source != NULL) ? event->source : "global",
            event->name ? event->name : "null",
            event->value ? event->value : "null");
740
    if (len > 0 && len < (int)sizeof (buf))
741 742 743 744 745 746
    {
        client_send_bytes (client, buf, len);
        if (client->con->error)
            return -1;
    }
    return 0;
Jack Moffitt's avatar
Jack Moffitt committed
747 748
}

749
void _dump_stats_to_queue (event_queue_t *queue)
Jack Moffitt's avatar
Jack Moffitt committed
750
{
751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781
    avl_node *node;
    avl_node *node2;
    stats_event_t *event;
    stats_source_t *source;

    thread_mutex_lock(&_stats_mutex);
    /* first we fill our queue with the current stats */
    /* start with the global stats */
    node = avl_get_first(_stats.global_tree);
    while (node) {
        event = _make_event_from_node((stats_node_t *)node->key, NULL);
        _add_event_to_queue(event, queue);

        node = avl_get_next(node);
    }

    /* now the stats for each source */
    node = avl_get_first(_stats.source_tree);
    while (node) {
        source = (stats_source_t *)node->key;
        node2 = avl_get_first(source->stats_tree);
        while (node2) {
            event = _make_event_from_node((stats_node_t *)node2->key, source->source);
            _add_event_to_queue(event, queue);

            node2 = avl_get_next(node2);
        }
        
        node = avl_get_next(node);
    }
    thread_mutex_unlock(&_stats_mutex);
Jack Moffitt's avatar
Jack Moffitt committed
782 783
}

784 785 786 787 788
/* factoring out code for stats loops
** this function copies all stats to queue, and registers 
** the queue for all new events atomically.
** note: mutex must already be created!
*/
789
static void _register_listener (event_listener_t *listener)
Jack Moffitt's avatar
Jack Moffitt committed
790
{
791 792 793 794
    avl_node *node;
    avl_node *node2;
    stats_event_t *event;
    stats_source_t *source;
Jack Moffitt's avatar
Jack Moffitt committed
795

796
    thread_mutex_lock(&_stats_mutex);
Jack Moffitt's avatar
Jack Moffitt committed
797

798 799 800 801 802 803
    /* first we fill our queue with the current stats */
    
    /* start with the global stats */
    node = avl_get_first(_stats.global_tree);
    while (node) {
        event = _make_event_from_node((stats_node_t *)node->key, NULL);
804
        _add_event_to_queue (event, &listener->queue);
Jack Moffitt's avatar
Jack Moffitt committed
805

806 807
        node = avl_get_next(node);
    }
Jack Moffitt's avatar
Jack Moffitt committed
808

809 810 811 812 813 814 815
    /* now the stats for each source */
    node = avl_get_first(_stats.source_tree);
    while (node) {
        source = (stats_source_t *)node->key;
        node2 = avl_get_first(source->stats_tree);
        while (node2) {
            event = _make_event_from_node((stats_node_t *)node2->key, source->source);
816
            _add_event_to_queue (event, &listener->queue);
817 818 819 820 821 822

            node2 = avl_get_next(node2);
        }
        
        node = avl_get_next(node);
    }
Jack Moffitt's avatar
Jack Moffitt committed
823

824
    /* now we register to receive future event notices */
825 826
    listener->next = (event_listener_t *)_event_listeners;
    _event_listeners = listener;
Jack Moffitt's avatar
Jack Moffitt committed
827

828
    thread_mutex_unlock(&_stats_mutex);
829 830 831 832
}

void *stats_connection(void *arg)
{
833
    client_t *client = (client_t *)arg;
834
    stats_event_t *event;
835
    event_listener_t listener;
836

837 838
    INFO0 ("stats client starting");

839
    event_queue_init (&listener.queue);
840 841 842
    /* increment the thread count */
    thread_mutex_lock(&_stats_mutex);
    _stats_threads++;
843
    stats_event_args (NULL, "stats", "%d", _stats_threads);
844 845
    thread_mutex_unlock(&_stats_mutex);

846
    thread_mutex_create (&(listener.mutex));
847

848
    _register_listener (&listener);
849 850

    while (_stats_running) {
851 852 853
        thread_mutex_lock (&listener.mutex);
        event = _get_event_from_queue (&listener.queue);
        thread_mutex_unlock (&listener.mutex);
854
        if (event != NULL) {
855
            if (_send_event_to_client(event, client) < 0) {
856 857 858 859 860 861
                _free_event(event);
                break;
            }
            _free_event(event);
            continue;
        }
862
        thread_sleep (500000);
863 864 865
    }

    thread_mutex_lock(&_stats_mutex);
866
    _unregister_listener (&listener);
867
    _stats_threads--;
868
    stats_event_args (NULL, "stats", "%d", _stats_threads);
869 870
    thread_mutex_unlock(&_stats_mutex);

871
    thread_mutex_destroy (&listener.mutex);
872
    client_destroy (client);
873 874
    INFO0 ("stats client finished");

875
    return NULL;
Jack Moffitt's avatar
Jack Moffitt committed
876 877
}

878 879 880 881 882 883 884 885 886 887 888 889 890

void stats_callback (client_t *client, void *notused)
{
    if (client->con->error)
    {
        client_destroy (client);
        return;
    }
    client_set_queue (client, NULL);
    thread_create("Stats Connection", stats_connection, (void *)client, THREAD_DETACHED);
}


Jack Moffitt's avatar
Jack Moffitt committed
891
typedef struct _source_xml_tag {
892 893
    char *mount;
    xmlNodePtr node;
Jack Moffitt's avatar
Jack Moffitt committed
894

895
    struct _source_xml_tag *next;
Jack Moffitt's avatar
Jack Moffitt committed
896 897 898 899
} source_xml_t;

static xmlNodePtr _find_xml_node(char *mount, source_xml_t **list, xmlNodePtr root)
{
900 901 902 903 904 905 906 907 908 909 910 911
    source_xml_t *node, *node2;
    int found = 0;

    /* search for existing node */
    node = *list;
    while (node) {
        if (strcmp(node->mount, mount) == 0) {
            found = 1;
            break;
        }
        node = node->next;
    }
Jack Moffitt's avatar
Jack Moffitt committed
912

913
    if (found) return node->node;
Jack Moffitt's avatar
Jack Moffitt committed
914

915
    /* if we didn't find it, we must build it and add it to the list */
Jack Moffitt's avatar
Jack Moffitt committed
916

917 918 919
    /* build node */
    node = (source_xml_t *)malloc(sizeof(source_xml_t));
    node->mount = strdup(mount);
920 921
    node->node = xmlNewChild (root, NULL, XMLSTR("source"), NULL);
    xmlSetProp (node->node, XMLSTR("mount"), XMLSTR(mount));
922
    node->next = NULL;
Jack Moffitt's avatar
Jack Moffitt committed
923

924 925 926 927 928 929 930 931
    /* add node */
    if (*list == NULL) {
        *list = node;
    } else {
        node2 = *list;
        while (node2->next) node2 = node2->next;
        node2->next = node;
    }
Jack Moffitt's avatar
Jack Moffitt committed
932

933
    return node->node;
Jack Moffitt's avatar
Jack Moffitt committed
934 935
}

936
void stats_transform_xslt(client_t *client, const char *uri)
937 938
{
    xmlDocPtr doc;
939
    char *xslpath = util_get_path_from_normalised_uri (uri);
940
    const char *mount = httpp_get_query_param (client->parser, "mount");
941

942
    stats_get_xml(&doc, 0, mount);
943

944
    xslt_transform(doc, xslpath, client);
945 946

    xmlFreeDoc(doc);
947
    free (xslpath);
948 949
}

950
void stats_get_xml(xmlDocPtr *doc, int show_hidden, const char *show_mount)
951
{
952
    stats_event_t *event;
953
    event_queue_t queue;
954 955 956
    xmlNodePtr node, srcnode;
    source_xml_t *src_nodes = NULL;
    source_xml_t *next;
957

958 959
    event_queue_init (&queue);
    _dump_stats_to_queue (&queue);
960

961 962
    *doc = xmlNewDoc (XMLSTR("1.0"));
    node = xmlNewDocNode(*doc, NULL, XMLSTR("icestats"), NULL);
963
    xmlDocSetRootElement(*doc, node);
964

965
    event = _get_event_from_queue(&queue);
966 967
    while (event)
    {
968 969
        if (event->hidden <= show_hidden)
        {
970 971 972
            do
            {
                xmlChar *name, *value;
973 974
                name = xmlEncodeEntitiesReentrant (*doc, XMLSTR(event->name));
                value = xmlEncodeEntitiesReentrant (*doc, XMLSTR(event->value));
975 976 977 978 979 980 981 982 983
                srcnode = node;
                if (event->source)
                {
                    if (show_mount && strcmp (event->source, show_mount) != 0)
                        break;
                    srcnode = _find_xml_node(event->source, &src_nodes, node);
                }
                else
                    srcnode = node;
984
                xmlNewChild(srcnode, NULL, XMLSTR(name), XMLSTR(value));
985 986 987
                xmlFree (value);
                xmlFree (name);
            } while (0);
988
        }
989

990 991 992
        _free_event(event);
        event = _get_event_from_queue(&queue);
    }
993

994 995 996 997 998 999
    while (src_nodes) {
        next = src_nodes->next;
        free(src_nodes->mount);
        free(src_nodes);
        src_nodes = next;
    }
1000
}
Jack Moffitt's avatar
Jack Moffitt committed
1001 1002
void stats_sendxml(client_t *client)
{
1003 1004
    int bytes;
    stats_event_t *event;
1005
    event_queue_t queue;
1006 1007 1008
    xmlDocPtr doc;
    xmlNodePtr node, srcnode;
    int len;
1009
    xmlChar *buff = NULL;
1010 1011 1012
    source_xml_t *snd;
    source_xml_t *src_nodes = NULL;

1013 1014
    event_queue_init (&queue);
    _dump_stats_to_queue (&queue);
1015

1016 1017
    doc = xmlNewDoc (XMLSTR("1.0"));
    node = xmlNewDocNode (doc, NULL, XMLSTR("icestats"), NULL);
1018 1019 1020 1021 1022 1023
    xmlDocSetRootElement(doc, node);


    event = _get_event_from_queue(&queue);
    while (event) {
        if (event->source == NULL) {
1024
            xmlNewChild (node, NULL, XMLSTR(event->name), XMLSTR(event->value));
1025 1026
        } else {
            srcnode = _find_xml_node(event->source, &src_nodes, node);
1027
            xmlNewChild (srcnode, NULL, XMLSTR(event->name), XMLSTR(event->value));
1028 1029 1030 1031 1032 1033
        }

        _free_event(event);
        event = _get_event_from_queue(&queue);
    }

1034
    xmlDocDumpMemory(doc, &buff, &len);
1035 1036 1037 1038 1039 1040 1041 1042 1043 1044
    xmlFreeDoc(doc);
    
    client->respcode = 200;
    bytes = sock_write(client->con->sock, "HTTP/1.0 200 OK\r\n"
               "Content-Length: %d\r\n"
               "Content-Type: text/xml\r\n"
               "\r\n", len);
    if (bytes > 0) client->con->sent_bytes += bytes;
    else goto send_error;

1045
    bytes = client_send_bytes (client, buff, (unsigned)len);
Jack Moffitt's avatar
Jack Moffitt committed
1046 1047

 send_error:
1048 1049 1050 1051 1052 1053 1054
    while (src_nodes) {
        snd = src_nodes->next;
        free(src_nodes->mount);
        free(src_nodes);
        src_nodes = snd;
    }
    if (buff) xmlFree(buff);
Jack Moffitt's avatar
Jack Moffitt committed
1055 1056 1057 1058
}

static int _compare_stats(void *arg, void *a, void *b)
{
1059 1060
    stats_node_t *nodea = (stats_node_t *)a;
    stats_node_t *nodeb = (stats_node_t *)b;
Jack Moffitt's avatar
Jack Moffitt committed
1061

1062
    return strcmp(nodea->name, nodeb->name);
Jack Moffitt's avatar
Jack Moffitt committed
1063 1064 1065 1066
}

static int _compare_source_stats(void *arg, void *a, void *b)
{
1067 1068
    stats_source_t *nodea = (stats_source_t *)a;
    stats_source_t *nodeb = (stats_source_t *)b;
Jack Moffitt's avatar
Jack Moffitt committed
1069

1070
    return strcmp(nodea->source, nodeb->source);
Jack Moffitt's avatar
Jack Moffitt committed
1071 1072 1073 1074
}

static int _free_stats(void *key)
{
1075 1076 1077 1078 1079 1080
    stats_node_t *node = (stats_node_t *)key;
    free(node->value);
    free(node->name);
    free(node);
    
    return 1;
Jack Moffitt's avatar
Jack Moffitt committed
1081 1082 1083 1084
}

static int _free_source_stats(void *key)
{
1085 1086 1087
    stats_source_t *node = (stats_source_t *)key;
    avl_tree_free(node->stats_tree, _free_stats);
    free(node->source);
1088
    free(node);
Jack Moffitt's avatar
Jack Moffitt committed
1089

1090
    return 1;
Jack Moffitt's avatar
Jack Moffitt committed
1091 1092 1093 1094
}

static void _free_event(stats_event_t *event)
{
1095 1096 1097 1098
    if (event->source) free(event->source);
    if (event->name) free(event->name);
    if (event->value) free(event->value);
    free(event);
Jack Moffitt's avatar
Jack Moffitt committed
1099
}
1100 1101


1102
refbuf_t *stats_get_streams (void)
1103
{
1104
#define STREAMLIST_BLKSIZE  4096
1105
    avl_node *node;
1106
    unsigned int remaining = STREAMLIST_BLKSIZE;
1107 1108
    refbuf_t *start = refbuf_new (remaining), *cur = start;
    char *buffer = cur->data;
1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119

    /* now the stats for each source */
    thread_mutex_lock (&_stats_mutex);
    node = avl_get_first(_stats.source_tree);
    while (node)
    {
        int ret;
        stats_source_t *source = (stats_source_t *)node->key;

        if (source->hidden == 0)
        {
1120
            if (remaining <= strlen (source->source) + 3)
1121
            {
1122 1123 1124 1125 1126
                cur->len = STREAMLIST_BLKSIZE - remaining;
                cur->next = refbuf_new (STREAMLIST_BLKSIZE);
                remaining = STREAMLIST_BLKSIZE;
                cur = cur->next;
                buffer = cur->data;
1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137
            }
            ret = snprintf (buffer, remaining, "%s\r\n", source->source);
            if (ret > 0)
            {
                buffer += ret;
                remaining -= ret;
            }
        }
        node = avl_get_next(node);
    }
    thread_mutex_unlock (&_stats_mutex);
1138 1139
    cur->len = STREAMLIST_BLKSIZE - remaining;
    return start;
1140 1141
}

1142 1143


1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172
/* This removes any source stats from virtual mountpoints, ie mountpoints
 * where no source_t exists. This function requires the global sources lock
 * to be held before calling.
 */
void stats_clear_virtual_mounts (void)
{
    avl_node *snode;

    thread_mutex_lock (&_stats_mutex);
    snode = avl_get_first(_stats.source_tree);
    while (snode)
    {
        stats_source_t *src = (stats_source_t *)snode->key;
        source_t *source = source_find_mount_raw (src->source);

        if (source == NULL)
        {
            /* no source_t is reserved so remove them now */
            snode = avl_get_next (snode);
            DEBUG1 ("releasing %s stats", src->source);
            avl_delete (_stats.source_tree, src, _free_source_stats);
            continue;
        }

        snode = avl_get_next (snode);
    }
    thread_mutex_unlock (&_stats_mutex);
}