event.c 10.3 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
/* Icecast
 *
 * This program is distributed under the GNU General Public License, version 2.
 * A copy of this license is included with this source.
 *
 * Copyright 2014,      Philipp Schafft <lion@lion.leolix.org>
 */

/* -*- c-basic-offset: 4; indent-tabs-mode: nil; -*- */
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <string.h>
#include <stdlib.h>

#include "event.h"
#include "event_log.h"
#include "event_exec.h"
#include "event_url.h"
21
#include "fastevent.h"
22 23
#include "logging.h"
#include "admin.h"
24
#include "connection.h"
25 26
#include "client.h"
#include "cfgfile.h"
27 28 29 30 31 32 33 34 35 36 37 38

#define CATMODULE "event"

static mutex_t event_lock;
static event_t *event_queue = NULL;
static int event_running = 0;
static thread_type *event_thread = NULL;

/* work with event_t* */
static void event_addref(event_t *event) {
    if (!event)
        return;
39
    thread_mutex_lock(&event_lock);
40
    event->refcount++;
41
    thread_mutex_unlock(&event_lock);
42 43 44
}

static void event_release(event_t *event) {
45 46
    size_t i;

47 48
    if (!event)
        return;
49 50

    thread_mutex_lock(&event_lock);
51
    event->refcount--;
52 53
    if (event->refcount) {
        thread_mutex_unlock(&event_lock);
54
        return;
55
    }
56

57 58 59
    for (i = 0; i < (sizeof(event->reglist)/sizeof(*event->reglist)); i++)
        event_registration_release(event->reglist[i]);

60 61 62 63 64 65 66 67 68
    free(event->trigger);
    free(event->uri);
    free(event->connection_ip);
    free(event->client_role);
    free(event->client_username);
    free(event->client_useragent);
    event_release(event->next);

    free(event);
69
    thread_mutex_unlock(&event_lock);
70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87
}

static void event_push(event_t **event, event_t *next) {
    size_t i = 0;

    if (!event || !next)
        return;

    while (*event && i < 128) {
        event = &(*event)->next;
        i++;
    }

    if (i == 128) {
        ICECAST_LOG_ERROR("Can not push event %p into queue. Queue is full.", event);
        return;
    }

88
    *event = next;
89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165
}

static void event_push_reglist(event_t *event, event_registration_t *reglist) {
    size_t i;

    if (!event || !reglist)
        return;

    for (i = 0; i < (sizeof(event->reglist)/sizeof(*event->reglist)); i++) {
        if (!event->reglist[i]) {
            event_registration_addref(event->reglist[i] = reglist);
            return;
        }
    }

    ICECAST_LOG_ERROR("Can not push reglist %p into event %p. No space left on event.", reglist, event);
}

static event_t *event_new(const char *trigger) {
    event_t *ret;

    if (!trigger)
        return NULL;

    ret = calloc(1, sizeof(event_t));

    if (!ret)
        return NULL;

    ret->refcount = 1;
    ret->trigger = strdup(trigger);
    ret->client_admin_command = ADMIN_COMMAND_ERROR;

    if (!ret->trigger) {
        event_release(ret);
        return NULL;
    }

    return ret;
}

/* subsystem functions */
static inline void _try_event(event_registration_t *er, event_t *event) {
    /* er is already locked */
    if (strcmp(er->trigger, event->trigger) != 0)
        return;

    if (er->emit)
        er->emit(er->state, event);
}

static inline void _try_registrations(event_registration_t *er, event_t *event) {
    if (!er)
        return;

    thread_mutex_lock(&er->lock);
    while (1) {
        /* try registration */
        _try_event(er, event);

       /* go to next registration */
       if (er->next) {
           event_registration_t *next = er->next;

           thread_mutex_lock(&next->lock);
           thread_mutex_unlock(&er->lock);
           er = next;
       } else {
           break;
       }
    }
    thread_mutex_unlock(&er->lock);
}

static void *event_run_thread (void *arg) {
    int running = 0;

166 167
    (void)arg;

168 169 170 171 172 173 174 175 176
    do {
        event_t *event;
        size_t i;

        thread_mutex_lock(&event_lock);
        running = event_running;
        if (event_queue) {
            event = event_queue;
            event_queue = event_queue->next;
177
            event->next = NULL;
178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211
        } else {
            event = NULL;
        }
        thread_mutex_unlock(&event_lock);

        /* sleep if nothing todo and then try again */
        if (!event) {
            thread_sleep(150000);
            continue;
        }

        for (i = 0; i < (sizeof(event->reglist)/sizeof(*event->reglist)); i++)
            _try_registrations(event->reglist[i], event);

        event_release(event);
    } while (running);

    return NULL;
}

void event_initialise(void) {
    /* create mutex */
    thread_mutex_create(&event_lock);

    /* initialise everything */
    thread_mutex_lock(&event_lock);
    event_running = 1;
    thread_mutex_unlock(&event_lock);

    /* start thread */
    event_thread = thread_create("events thread", event_run_thread, NULL, THREAD_ATTACHED);
}

void event_shutdown(void) {
212 213
    event_t *event_queue_to_free = NULL;

214 215 216 217 218 219 220 221 222 223 224 225 226 227
    /* stop thread */
    if (!event_running)
        return;

    thread_mutex_lock(&event_lock);
    event_running = 0;
    thread_mutex_unlock(&event_lock);

    /* join thread as soon as it stopped */
    thread_join(event_thread);

    /* shutdown everything */
    thread_mutex_lock(&event_lock);
    event_thread = NULL;
228
    event_queue_to_free = event_queue;
229 230 231
    event_queue = NULL;
    thread_mutex_unlock(&event_lock);

232 233
    event_release(event_queue_to_free);

234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249
    /* destry mutex */
    thread_mutex_destroy(&event_lock);
}


/* basic functions to work with event registrations */
event_registration_t * event_new_from_xml_node(xmlNodePtr node) {
    event_registration_t *ret = calloc(1, sizeof(event_registration_t));
    config_options_t *options;
    int rv;

    if(!ret)
        return NULL;

    ret->refcount = 1;

250
    /* BEFORE RELEASE 2.5.0 DOCUMENT: Document <event type="..." trigger="..."> */
251 252 253 254
    ret->type     = (char*)xmlGetProp(node, XMLSTR("type"));
    ret->trigger  = (char*)xmlGetProp(node, XMLSTR("trigger"));

    if (!ret->type || !ret->trigger) {
255
        ICECAST_LOG_ERROR("Event node isn't complete. Type or Trigger missing.");
256 257 258 259 260 261 262 263 264
        event_registration_release(ret);
        return NULL;
    }

    options = config_parse_options(node);
    if (strcmp(ret->type, EVENT_TYPE_LOG) == 0) {
        rv = event_get_log(ret, options);
    } else if (strcmp(ret->type, EVENT_TYPE_EXEC) == 0) {
        rv = event_get_exec(ret, options);
265
#ifdef HAVE_CURL
266 267 268 269
    } else if (strcmp(ret->type, EVENT_TYPE_URL) == 0) {
        rv = event_get_url(ret, options);
#endif
    } else {
270
        ICECAST_LOG_ERROR("Unknown Event backend %s.", ret->type);
271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348
        rv = -1;
    }
    config_clear_options(options);

    if (rv != 0) {
        ICECAST_LOG_ERROR("Can not set up event backend %s for trigger %s", ret->type, ret->trigger);
        event_registration_release(ret);
        return NULL;
    }

    return ret;
}

void event_registration_addref(event_registration_t * er) {
    if(!er)
        return;
    thread_mutex_lock(&er->lock);
    er->refcount++;
    thread_mutex_unlock(&er->lock);
}

void event_registration_release(event_registration_t *er) {
    if(!er)
        return;
    thread_mutex_lock(&er->lock);
    er->refcount--;

    if (er->refcount) {
        thread_mutex_unlock(&er->lock);
        return;
    }

    if (er->next)
        event_registration_release(er->next);

    xmlFree(er->type);
    xmlFree(er->trigger);

    if (er->free)
        er->free(er->state);

    thread_mutex_unlock(&er->lock);
    thread_mutex_destroy(&er->lock);
    free(er);
}

void event_registration_push(event_registration_t **er, event_registration_t *tail) {
    event_registration_t *next, *cur;

    if (!er || !tail)
        return;

    if (!*er) {
        event_registration_addref(*er = tail);
        return;
    }

    event_registration_addref(cur = *er);
    thread_mutex_lock(&cur->lock);
    while (1) {
        next = cur->next;
        if (!cur->next)
            break;

        event_registration_addref(next);
        thread_mutex_unlock(&cur->lock);
        event_registration_release(cur);
        cur = next;
        thread_mutex_lock(&cur->lock);
    }

    event_registration_addref(cur->next = tail);
    thread_mutex_unlock(&cur->lock);
    event_registration_release(cur);
}

/* event signaling */
void event_emit(event_t *event) {
349
    fastevent_emit(FASTEVENT_TYPE_SLOWEVENT, FASTEVENT_FLAG_NONE, FASTEVENT_DATATYPE_EVENT, event);
350
    event_addref(event);
351 352 353 354 355
    thread_mutex_lock(&event_lock);
    event_push(&event_queue, event);
    thread_mutex_unlock(&event_lock);
}

356
/* this function needs to extract all the info from the client, source and mount object
357 358 359 360 361 362 363 364 365 366 367 368
 * as after return the pointers become invalid.
 */
void event_emit_clientevent(const char *trigger, client_t *client, const char *uri) {
    event_t *event = event_new(trigger);
    ice_config_t *config;
    mount_proxy *mount;

    if (!event) {
        ICECAST_LOG_ERROR("Can not create event.");
        return;
    }

369 370 371 372 373 374 375 376 377 378 379 380
    config = config_get_config();
    event_push_reglist(event, config->event);

    mount = config_find_mount(config, uri, MOUNT_TYPE_NORMAL);
    if (mount && mount->mounttype == MOUNT_TYPE_NORMAL)
        event_push_reglist(event, mount->event);

    mount = config_find_mount(config, uri, MOUNT_TYPE_DEFAULT);
    if (mount && mount->mounttype == MOUNT_TYPE_DEFAULT)
        event_push_reglist(event, mount->event);
    config_release_config();

381
    /* This isn't perfectly clean but is an important speedup:
382 383 384 385 386 387
     * If first element of reglist is NULL none of the above pushed in
     * some registrations. If there are no registrations we can just drop
     * this event now and here.
     * We do this before inserting all the data into the object to avoid
     * all the strdups() and stuff in case they aren't needed.
     */
388
#ifndef FASTEVENT_ENABLED
389 390 391 392 393
    if (event->reglist[0] == NULL) {
        /* we have no registrations, drop this event. */
        event_release(event);
        return;
    }
394
#endif
395

396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416
    if (client) {
        const char *tmp;
        event->connection_id = client->con->id;
        event->connection_time = client->con->con_time;
        event->client_admin_command = client->admin_command;
        event->connection_ip = strdup(client->con->ip);
        if (client->role)
            event->client_role = strdup(client->role);
        if (client->username)
            event->client_username = strdup(client->username);
        tmp = httpp_getvar(client->parser, "user-agent");
        if (tmp)
            event->client_useragent = strdup(tmp);
    }

    if (uri)
        event->uri = strdup(uri);

    event_emit(event);
    event_release(event);
}