citadel/modules/eventclient/serv_eventclient.c

   1 /*
   2  * Copyright (c) 1998-2009 by the citadel.org team
   3  *
   4  *  This program is free software; you can redistribute it and/or modify
   5  *  it under the terms of the GNU General Public License as published by
   6  *  the Free Software Foundation; either version 3 of the License, or
   7  *  (at your option) any later version.
   8  *
   9  *  This program is distributed in the hope that it will be useful,
  10  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  *  GNU General Public License for more details.
  13  *
  14  *  You should have received a copy of the GNU General Public License
  15  *  along with this program; if not, write to the Free Software
  16  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  17  */
  18
  19 #include "sysdep.h"
  20 #include <stdlib.h>
  21 #include <unistd.h>
  22 #include <stdio.h>
  23 #include <termios.h>
  24 #include <fcntl.h>
  25 #include <signal.h>
  26 #include <pwd.h>
  27 #include <errno.h>
  28 #include <sys/types.h>
  29 #include <syslog.h>
  30
  31 #if TIME_WITH_SYS_TIME
  32 # include <sys/time.h>
  33 # include <time.h>
  34 #else
  35 # if HAVE_SYS_TIME_H
  36 #  include <sys/time.h>
  37 # else
  38 #  include <time.h>
  39 # endif
  40 #endif
  41 #include <sys/wait.h>
  42 #include <ctype.h>
  43 #include <string.h>
  44 #include <limits.h>
  45 #include <sys/socket.h>
  46 #include <netinet/in.h>
  47 #include <arpa/inet.h>
  48 #include <libcitadel.h>
  49 #include <curl/curl.h>
  50 #include <curl/multi.h>
  51 #include "citadel.h"
  52 #include "server.h"
  53 #include "citserver.h"
  54 #include "support.h"
  55
  56 #include "ctdl_module.h"
  57
  58 #include "event_client.h"
  59 #include "serv_curl.h"
  60
  61 ev_loop *event_base;
  62
  63 long EvIDSource = 0;
  64 /*****************************************************************************
  65  *                   libevent / curl integration                             *
  66  *****************************************************************************/
  67 #define MOPT(s, v)                                                      \
  68         do {                                                            \
  69                 sta = curl_multi_setopt(mhnd, (CURLMOPT_##s), (v));     \
  70                 if (sta) {                                              \
  71                         syslog(LOG_ERR, "EVCURL: error setting option " #s " on curl multi handle: %s\n", curl_easy_strerror(sta)); \
  72                         exit (1);                                       \
  73                 }                                                       \
  74         } while (0)
  75
  76 typedef struct _evcurl_global_data {
  77         int magic;
  78         CURLM *mhnd;
  79         ev_timer timeev;
  80         int nrun;
  81 } evcurl_global_data;
  82
  83 ev_async WakeupCurl;
  84 evcurl_global_data global;
  85
  86 static void
  87 gotstatus(int nnrun)
  88 {
  89         CURLM *mhnd;
  90         CURLMsg *msg;
  91         int nmsg;
  92
  93         global.nrun = nnrun;
  94         mhnd = global.mhnd;
  95
  96         syslog(LOG_DEBUG, "CURLEV: gotstatus(): about to call curl_multi_info_read\n");
  97         while ((msg = curl_multi_info_read(mhnd, &nmsg))) {
  98                 syslog(LOG_ERR, "EVCURL: got curl multi_info message msg=%d\n", msg->msg);
  99                 if (CURLMSG_DONE == msg->msg) {
 100                         CURL *chnd;
 101                         char *chandle;
 102                         CURLcode sta;
 103                         CURLMcode msta;
 104                         AsyncIO  *IO;
 105
 106                         chandle = NULL;;
 107                         chnd = msg->easy_handle;
 108                         sta = curl_easy_getinfo(chnd, CURLINFO_PRIVATE, &chandle);
 109                         syslog(LOG_ERR, "EVCURL: request complete\n");
 110                         if (sta)
 111                                 syslog(LOG_ERR, "EVCURL: error asking curl for private cookie of curl handle: %s\n", curl_easy_strerror(sta));
 112                         IO = (AsyncIO *)chandle;
 113
 114                         ev_io_stop(event_base, &IO->recv_event);
 115                         ev_io_stop(event_base, &IO->send_event);
 116
 117                         sta = msg->data.result;
 118                         if (sta) {
 119                                 EV_syslog(LOG_ERR, "EVCURL: error description: %s\n", IO->HttpReq.errdesc);
 120                                 EV_syslog(LOG_ERR, "EVCURL: error performing request: %s\n", curl_easy_strerror(sta));
 121                         }
 122                         sta = curl_easy_getinfo(chnd, CURLINFO_RESPONSE_CODE, &IO->HttpReq.httpcode);
 123                         if (sta)
 124                                 EV_syslog(LOG_ERR, "EVCURL: error asking curl for response code from request: %s\n", curl_easy_strerror(sta));
 125                         EV_syslog(LOG_ERR, "EVCURL: http response code was %ld\n", (long)IO->HttpReq.httpcode);
 126
 127
 128                         curl_slist_free_all(IO->HttpReq.headers);
 129                         msta = curl_multi_remove_handle(mhnd, chnd);
 130                         if (msta)
 131                                 EV_syslog(LOG_ERR, "EVCURL: warning problem detaching completed handle from curl multi: %s\n", curl_multi_strerror(msta));
 132
 133                         curl_easy_cleanup(IO->HttpReq.chnd);
 134                         IO->HttpReq.chnd = NULL;
 135
 136                         IO->HttpReq.attached = 0;
 137                         IO->SendDone(IO);
 138
 139                         FreeStrBuf(&IO->HttpReq.ReplyData);
 140                         FreeURL(&IO->ConnectMe);
 141                         RemoveContext(IO->CitContext);
 142                         IO->Terminate(IO);
 143                 }
 144         }
 145 }
 146
 147 static void
 148 stepmulti(void *data, curl_socket_t fd, int which)
 149 {
 150         int running_handles = 0;
 151         CURLMcode msta;
 152
 153         msta = curl_multi_socket_action(global.mhnd, fd, which, &running_handles);
 154         syslog(LOG_DEBUG, "EVCURL: stepmulti(): calling gotstatus()\n");
 155         if (msta)
 156                 syslog(LOG_ERR, "EVCURL: error in curl processing events on multi handle, fd %d: %s\n", (int)fd, curl_multi_strerror(msta));
 157         if (global.nrun != running_handles)
 158                 gotstatus(running_handles);
 159 }
 160
 161 static void
 162 gottime(struct ev_loop *loop, ev_timer *timeev, int events) {
 163         syslog(LOG_DEBUG, "EVCURL: waking up curl for timeout\n");
 164         stepmulti(NULL, CURL_SOCKET_TIMEOUT, 0);
 165 }
 166
 167 static void
 168 got_in(struct ev_loop *loop, ev_io *ioev, int events) {
 169         syslog(LOG_DEBUG, "EVCURL: waking up curl for io on fd %d\n", (int)ioev->fd);
 170         stepmulti(ioev->data, ioev->fd, CURL_CSELECT_IN);
 171 }
 172
 173 static void
 174 got_out(struct ev_loop *loop, ev_io *ioev, int events) {
 175         syslog(LOG_DEBUG, "EVCURL: waking up curl for io on fd %d\n", (int)ioev->fd);
 176         stepmulti(ioev->data, ioev->fd, CURL_CSELECT_OUT);
 177 }
 178
 179 static size_t
 180 gotdata(void *data, size_t size, size_t nmemb, void *cglobal) {
 181         AsyncIO *IO = (AsyncIO*) cglobal;
 182
 183         if (IO->HttpReq.ReplyData == NULL)
 184         {
 185             IO->HttpReq.ReplyData = NewStrBufPlain(NULL, SIZ);
 186         }
 187         return CurlFillStrBuf_callback(data, size, nmemb, IO->HttpReq.ReplyData);
 188 }
 189
 190 static int
 191 gotwatchtime(CURLM *multi, long tblock_ms, void *cglobal) {
 192         syslog(LOG_DEBUG, "EVCURL: gotwatchtime called %ld ms\n", tblock_ms);
 193         evcurl_global_data *global = cglobal;
 194         ev_timer_stop(EV_DEFAULT, &global->timeev);
 195         if (tblock_ms < 0 || 14000 < tblock_ms)
 196                 tblock_ms = 14000;
 197         ev_timer_set(&global->timeev, 0.5e-3 + 1.0e-3 * tblock_ms, 14.0);
 198         ev_timer_start(EV_DEFAULT_UC, &global->timeev);
 199         curl_multi_perform(global, CURL_POLL_NONE);
 200         return 0;
 201 }
 202
 203 static int
 204 gotwatchsock(CURL *easy, curl_socket_t fd, int action, void *cglobal, void *vIO) {
 205         evcurl_global_data *global = cglobal;
 206         CURLM *mhnd = global->mhnd;
 207         char *f;
 208         AsyncIO *IO = (AsyncIO*) vIO;
 209         CURLcode sta;
 210
 211         EV_syslog(LOG_DEBUG, "EVCURL: gotwatchsock called fd=%d action=%d\n", (int)fd, action);
 212         if (IO == NULL) {
 213                 sta = curl_easy_getinfo(easy, CURLINFO_PRIVATE, &f);
 214                 if (sta) {
 215                         EV_syslog(LOG_ERR, "EVCURL: error asking curl for private cookie of curl handle: %s\n", curl_easy_strerror(sta));
 216                         return -1;
 217                 }
 218                 IO = (AsyncIO *) f;
 219                 if (IO->SendBuf.fd != 0)
 220                 {
 221                         ev_io_stop(event_base, &IO->recv_event);
 222                         ev_io_stop(event_base, &IO->send_event);
 223                 }
 224                 IO->SendBuf.fd = fd;
 225                 ev_io_init(&IO->recv_event, &got_in, fd, EV_READ);
 226                 ev_io_init(&IO->send_event, &got_out, fd, EV_WRITE);
 227                 curl_multi_assign(mhnd, fd, IO);
 228
 229         }
 230
 231         switch (action)
 232         {
 233         case CURL_POLL_NONE:
 234                 EVM_syslog(LOG_ERR,"EVCURL: called first time to register this sockwatcker\n");
 235                 break;
 236         case CURL_POLL_REMOVE:
 237                 EVM_syslog(LOG_ERR,"EVCURL: called last time to unregister this sockwatcher\n");
 238                 ev_io_stop(event_base, &IO->recv_event);
 239                 ev_io_stop(event_base, &IO->send_event);
 240                 break;
 241         case CURL_POLL_IN:
 242                 ev_io_stop(event_base, &IO->recv_event);
 243                 ev_io_start(event_base, &IO->send_event);
 244                 break;
 245         case CURL_POLL_OUT:
 246                 ev_io_stop(event_base, &IO->send_event);
 247                 ev_io_start(event_base, &IO->recv_event);
 248                 break;
 249         case CURL_POLL_INOUT:
 250                 ev_io_start(event_base, &IO->send_event);
 251                 ev_io_start(event_base, &IO->recv_event);
 252                 break;
 253         }
 254         return 0;
 255 }
 256
 257 void curl_init_connectionpool(void)
 258 {
 259         CURLM *mhnd ;
 260
 261         ev_timer_init(&global.timeev, &gottime, 14.0, 14.0);
 262         global.timeev.data = (void *)&global;
 263         global.nrun = -1;
 264         CURLcode sta = curl_global_init(CURL_GLOBAL_ALL);
 265
 266         if (sta)
 267         {
 268                 syslog(LOG_ERR,"EVCURL: error initializing curl library: %s\n", curl_easy_strerror(sta));
 269                 exit(1);
 270         }
 271         mhnd = global.mhnd = curl_multi_init();
 272         if (!mhnd)
 273         {
 274                 syslog(LOG_ERR,"EVCURL: error initializing curl multi handle\n");
 275                 exit(3);
 276         }
 277
 278         MOPT(SOCKETFUNCTION, &gotwatchsock);
 279         MOPT(SOCKETDATA, (void *)&global);
 280         MOPT(TIMERFUNCTION, &gotwatchtime);
 281         MOPT(TIMERDATA, (void *)&global);
 282
 283         return;
 284 }
 285
 286
 287
 288
 289 int evcurl_init(AsyncIO *IO,
 290                 void *CustomData,
 291                 const char* Desc,
 292                 IO_CallBack CallBack,
 293                 IO_CallBack Terminate)
 294 {
 295         CURLcode sta;
 296         CURL *chnd;
 297
 298         EVM_syslog(LOG_DEBUG, "EVCURL: evcurl_init called ms\n");
 299         IO->HttpReq.attached = 0;
 300         IO->SendDone = CallBack;
 301         IO->Terminate = Terminate;
 302         chnd = IO->HttpReq.chnd = curl_easy_init();
 303         if (!chnd)
 304         {
 305                 EVM_syslog(LOG_ERR, "EVCURL: error initializing curl handle\n");
 306                 return 1;
 307         }
 308
 309         strcpy(IO->HttpReq.errdesc, Desc);
 310
 311         OPT(VERBOSE, (long)1);
 312                 /* unset in production */
 313         OPT(NOPROGRESS, (long)1);
 314         OPT(NOSIGNAL, (long)1);
 315         OPT(FAILONERROR, (long)1);
 316         OPT(ENCODING, "");
 317         OPT(FOLLOWLOCATION, (long)1);
 318         OPT(MAXREDIRS, (long)7);
 319         OPT(USERAGENT, CITADEL);
 320
 321         OPT(TIMEOUT, (long)1800);
 322         OPT(LOW_SPEED_LIMIT, (long)64);
 323         OPT(LOW_SPEED_TIME, (long)600);
 324         OPT(CONNECTTIMEOUT, (long)600);
 325         OPT(PRIVATE, (void *)IO);
 326
 327         OPT(FORBID_REUSE, 1);
 328         OPT(WRITEFUNCTION, &gotdata);
 329         OPT(WRITEDATA, (void *)IO);
 330         OPT(ERRORBUFFER, IO->HttpReq.errdesc);
 331
 332         if (
 333                 (!IsEmptyStr(config.c_ip_addr))
 334                 && (strcmp(config.c_ip_addr, "*"))
 335                 && (strcmp(config.c_ip_addr, "::"))
 336                 && (strcmp(config.c_ip_addr, "0.0.0.0"))
 337         ) {
 338                 OPT(INTERFACE, config.c_ip_addr);
 339         }
 340                 /* point to a structure that points back to the perl structure and stuff */
 341         EV_syslog(LOG_DEBUG, "EVCURL: Loading URL: %s\n", IO->ConnectMe->PlainUrl);
 342         OPT(URL, IO->ConnectMe->PlainUrl);
 343         if (StrLength(IO->ConnectMe->CurlCreds))
 344         {
 345                 OPT(HTTPAUTH, (long)CURLAUTH_BASIC);
 346                 OPT(USERPWD, ChrPtr(IO->ConnectMe->CurlCreds));
 347         }
 348 #ifdef CURLOPT_HTTP_CONTENT_DECODING
 349         OPT(HTTP_CONTENT_DECODING, 1);
 350         OPT(ENCODING, "");
 351 #endif
 352         if (StrLength(IO->HttpReq.PostData) > 0)
 353         {
 354                 OPT(POSTFIELDS, ChrPtr(IO->HttpReq.PostData));
 355                 OPT(POSTFIELDSIZE, StrLength(IO->HttpReq.PostData));
 356
 357         }
 358         else if ((IO->HttpReq.PlainPostDataLen != 0) && (IO->HttpReq.PlainPostData != NULL))
 359         {
 360                 OPT(POSTFIELDS, IO->HttpReq.PlainPostData);
 361                 OPT(POSTFIELDSIZE, IO->HttpReq.PlainPostDataLen);
 362         }
 363
 364         IO->HttpReq.headers = curl_slist_append(IO->HttpReq.headers, "Connection: close");
 365         OPT(HTTPHEADER, IO->HttpReq.headers);
 366
 367         return 1;
 368 }
 369
 370 eNextState
 371 evcurl_handle_start(AsyncIO *IO)
 372 {
 373         CURLMcode msta;
 374         IO->NextState = eConnect;
 375         EVM_syslog(LOG_DEBUG, "EVCURL: attaching to curl multi handle\n");
 376         msta = curl_multi_add_handle(global.mhnd, IO->HttpReq.chnd);
 377         if (msta)
 378                 EV_syslog(LOG_ERR, "EVCURL: error attaching to curl multi handle: %s\n", curl_multi_strerror(msta));
 379         IO->HttpReq.attached = 1;
 380         ev_async_send (event_base, &WakeupCurl);
 381         return eReadMessage;
 382 }
 383
 384 static void WakeupCurlCallback(EV_P_ ev_async *w, int revents)
 385 {
 386         syslog(LOG_DEBUG, "EVCURL: waking up curl multi handle\n");
 387
 388         curl_multi_perform(&global, CURL_POLL_NONE);
 389 }
 390
 391 static void evcurl_shutdown (void)
 392 {
 393         curl_multi_cleanup(global.mhnd);
 394 }
 395 /*****************************************************************************
 396  *                       libevent integration                                *
 397  *****************************************************************************/
 398 /*
 399  * client event queue plus its methods.
 400  * this currently is the main loop (which may change in some future?)
 401  */
 402 int evbase_count = 0;
 403 int event_add_pipe[2] = {-1, -1};
 404 pthread_mutex_t EventQueueMutex; /* locks the access to the following vars: */
 405 HashList *QueueEvents = NULL;
 406 HashList *InboundEventQueue = NULL;
 407 HashList *InboundEventQueues[2] = { NULL, NULL };
 408
 409 ev_async AddJob;
 410 ev_async ExitEventLoop;
 411
 412 static void QueueEventAddCallback(EV_P_ ev_async *w, int revents)
 413 {
 414         HashList *q;
 415         void *v;
 416         HashPos  *It;
 417         long len;
 418         const char *Key;
 419
 420         /* get the control command... */
 421         pthread_mutex_lock(&EventQueueMutex);
 422
 423         if (InboundEventQueues[0] == InboundEventQueue) {
 424                 InboundEventQueue = InboundEventQueues[1];
 425                 q = InboundEventQueues[0];
 426         }
 427         else {
 428                 InboundEventQueue = InboundEventQueues[0];
 429                 q = InboundEventQueues[1];
 430         }
 431         pthread_mutex_unlock(&EventQueueMutex);
 432
 433         It = GetNewHashPos(q, 0);
 434         while (GetNextHashPos(q, It, &len, &Key, &v))
 435         {
 436                 IOAddHandler *h = v;
 437                 if (h->IO->ID == 0)
 438                         h->IO->ID = EvIDSource++;
 439                 h->EvAttch(h->IO);
 440         }
 441         DeleteHashPos(&It);
 442         DeleteHashContent(&q);
 443         syslog(LOG_DEBUG, "EVENT Q Read done.\n");
 444 }
 445
 446
 447 static void EventExitCallback(EV_P_ ev_async *w, int revents)
 448 {
 449         ev_break(event_base, EVBREAK_ALL);
 450
 451         syslog(LOG_DEBUG, "EVENT Q exiting.\n");
 452 }
 453
 454
 455
 456 void InitEventQueue(void)
 457 {
 458         struct rlimit LimitSet;
 459
 460         pthread_mutex_init(&EventQueueMutex, NULL);
 461
 462         if (pipe(event_add_pipe) != 0) {
 463                 syslog(LOG_EMERG, "Unable to create pipe for libev queueing: %s\n", strerror(errno));
 464                 abort();
 465         }
 466         LimitSet.rlim_cur = 1;
 467         LimitSet.rlim_max = 1;
 468         setrlimit(event_add_pipe[1], &LimitSet);
 469
 470         QueueEvents = NewHash(1, Flathash);
 471         InboundEventQueues[0] = NewHash(1, Flathash);
 472         InboundEventQueues[1] = NewHash(1, Flathash);
 473         InboundEventQueue = InboundEventQueues[0];
 474 }
 475 /*
 476  * this thread operates the select() etc. via libev.
 477  *
 478  *
 479  */
 480 void *client_event_thread(void *arg)
 481 {
 482         struct CitContext libev_client_CC;
 483
 484         CtdlFillSystemContext(&libev_client_CC, "LibEv Thread");
 485 //      citthread_setspecific(MyConKey, (void *)&smtp_queue_CC);
 486         syslog(LOG_DEBUG, "client_ev_thread() initializing\n");
 487
 488         event_base = ev_default_loop (EVFLAG_AUTO);
 489
 490         ev_async_init(&AddJob, QueueEventAddCallback);
 491         ev_async_start(event_base, &AddJob);
 492         ev_async_init(&ExitEventLoop, EventExitCallback);
 493         ev_async_start(event_base, &ExitEventLoop);
 494         ev_async_init(&WakeupCurl, WakeupCurlCallback);
 495         ev_async_start(event_base, &WakeupCurl);
 496
 497         curl_init_connectionpool();
 498
 499         ev_run (event_base, 0);
 500
 501
 502 ///what todo here?      CtdlClearSystemContext();
 503         ev_loop_destroy (EV_DEFAULT_UC);
 504
 505         DeleteHash(&QueueEvents);
 506         InboundEventQueue = NULL;
 507         DeleteHash(&InboundEventQueues[0]);
 508         DeleteHash(&InboundEventQueues[1]);
 509 /*      citthread_mutex_destroy(&EventQueueMutex); TODO */
 510         evcurl_shutdown();
 511
 512         return(NULL);
 513 }
 514 /*------------------------------------------------------------------------------*/
 515 /*
 516  * DB-Queue; does async bdb operations.
 517  * has its own set of handlers.
 518  */
 519 ev_loop *event_db;
 520 int evdb_count = 0;
 521 int evdb_add_pipe[2] = {-1, -1};
 522 pthread_mutex_t DBEventQueueMutex; /* locks the access to the following vars: */
 523 HashList *DBQueueEvents = NULL;
 524 HashList *DBInboundEventQueue = NULL;
 525 HashList *DBInboundEventQueues[2] = { NULL, NULL };
 526
 527 ev_async DBAddJob;
 528 ev_async DBExitEventLoop;
 529
 530 extern void ShutDownDBCLient(AsyncIO *IO);
 531
 532 static void DBQueueEventAddCallback(EV_P_ ev_async *w, int revents)
 533 {
 534         HashList *q;
 535         void *v;
 536         HashPos  *It;
 537         long len;
 538         const char *Key;
 539
 540         /* get the control command... */
 541         pthread_mutex_lock(&DBEventQueueMutex);
 542
 543         if (DBInboundEventQueues[0] == DBInboundEventQueue) {
 544                 DBInboundEventQueue = DBInboundEventQueues[1];
 545                 q = DBInboundEventQueues[0];
 546         }
 547         else {
 548                 DBInboundEventQueue = DBInboundEventQueues[0];
 549                 q = DBInboundEventQueues[1];
 550         }
 551         pthread_mutex_unlock(&DBEventQueueMutex);
 552
 553         It = GetNewHashPos(q, 0);
 554         while (GetNextHashPos(q, It, &len, &Key, &v))
 555         {
 556                 IOAddHandler *h = v;
 557                 eNextState rc;
 558                 if (h->IO->ID == 0)
 559                         h->IO->ID = EvIDSource++;
 560                 rc = h->EvAttch(h->IO);
 561                 switch (rc)
 562                 {
 563                 case eAbort:
 564                     ShutDownDBCLient(h->IO);
 565                 default:
 566                     break;
 567                 }
 568         }
 569         DeleteHashPos(&It);
 570         DeleteHashContent(&q);
 571         syslog(LOG_DEBUG, "DBEVENT Q Read done.\n");
 572 }
 573
 574
 575 static void DBEventExitCallback(EV_P_ ev_async *w, int revents)
 576 {
 577         syslog(LOG_DEBUG, "EVENT Q exiting.\n");
 578         ev_break(event_db, EVBREAK_ALL);
 579 }
 580
 581
 582
 583 void DBInitEventQueue(void)
 584 {
 585         struct rlimit LimitSet;
 586
 587         pthread_mutex_init(&DBEventQueueMutex, NULL);
 588
 589         if (pipe(evdb_add_pipe) != 0) {
 590                 syslog(LOG_EMERG, "Unable to create pipe for libev queueing: %s\n", strerror(errno));
 591                 abort();
 592         }
 593         LimitSet.rlim_cur = 1;
 594         LimitSet.rlim_max = 1;
 595         setrlimit(evdb_add_pipe[1], &LimitSet);
 596
 597         DBQueueEvents = NewHash(1, Flathash);
 598         DBInboundEventQueues[0] = NewHash(1, Flathash);
 599         DBInboundEventQueues[1] = NewHash(1, Flathash);
 600         DBInboundEventQueue = DBInboundEventQueues[0];
 601 }
 602
 603 /*
 604  * this thread operates writing to the message database via libev.
 605  *
 606  *
 607  */
 608 void *db_event_thread(void *arg)
 609 {
 610         struct CitContext libev_msg_CC;
 611
 612         CtdlFillSystemContext(&libev_msg_CC, "LibEv DB IO Thread");
 613 //      citthread_setspecific(MyConKey, (void *)&smtp_queue_CC);
 614         syslog(LOG_DEBUG, "client_msgev_thread() initializing\n");
 615
 616         event_db = ev_loop_new (EVFLAG_AUTO);
 617
 618         ev_async_init(&DBAddJob, DBQueueEventAddCallback);
 619         ev_async_start(event_db, &DBAddJob);
 620         ev_async_init(&DBExitEventLoop, DBEventExitCallback);
 621         ev_async_start(event_db, &DBExitEventLoop);
 622
 623         ev_run (event_db, 0);
 624
 625
 626 //// what to do here?   CtdlClearSystemContext();
 627         ev_loop_destroy (event_db);
 628
 629         DeleteHash(&DBQueueEvents);
 630         DBInboundEventQueue = NULL;
 631         DeleteHash(&DBInboundEventQueues[0]);
 632         DeleteHash(&DBInboundEventQueues[1]);
 633 /*      citthread_mutex_destroy(&DBEventQueueMutex); TODO */
 634
 635         return(NULL);
 636 }
 637
 638 CTDL_MODULE_INIT(event_client)
 639 {
 640         if (!threading)
 641         {
 642                 InitEventQueue();
 643                 DBInitEventQueue();
 644                 CtdlThreadCreate(/*"Client event", */ client_event_thread);
 645                 CtdlThreadCreate(/*"DB event", */db_event_thread);
 646 /// todo register shutdown callback.
 647         }
 648         return "event";
 649 }