citadel/event_client.c

   1 /*
   2  * Copyright (c) 1998-2012 by the citadel.org team
   3  *
   4  * This program is open source software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License, version 3.
   6  *
   7  * This program is distributed in the hope that it will be useful,
   8  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   9  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10  * GNU General Public License for more details.
  11  */
  12 #include "sysdep.h"
  13
  14 #include <stdio.h>
  15 #include <string.h>
  16 #include <syslog.h>
  17 #include <assert.h>
  18 #include <sys/socket.h>
  19 #include <netinet/in.h>
  20 #include <arpa/inet.h>
  21 #if HAVE_BACKTRACE
  22 #include <execinfo.h>
  23 #endif
  24
  25 #include <libcitadel.h>
  26
  27 #include "ctdl_module.h"
  28 #include "event_client.h"
  29
  30 ConstStr IOStates[] = {
  31         {HKEY("DB Queue")},
  32         {HKEY("DB Q Next")},
  33         {HKEY("DB Attach")},
  34         {HKEY("DB Next")},
  35         {HKEY("DB Stop")},
  36         {HKEY("DB Exit")},
  37         {HKEY("DB Terminate")},
  38         {HKEY("IO Queue")},
  39         {HKEY("IO Attach")},
  40         {HKEY("IO Connect Socket")},
  41         {HKEY("IO Abort")},
  42         {HKEY("IO Timeout")},
  43         {HKEY("IO ConnFail")},
  44         {HKEY("IO ConnFail Now")},
  45         {HKEY("IO Conn Now")},
  46         {HKEY("IO Conn Wait")},
  47         {HKEY("Curl Q")},
  48         {HKEY("Curl Start")},
  49         {HKEY("Curl Shotdown")},
  50         {HKEY("Curl More IO")},
  51         {HKEY("Curl Got IO")},
  52         {HKEY("Curl Got Data")},
  53         {HKEY("Curl Got Status")},
  54         {HKEY("C-Ares Start")},
  55         {HKEY("C-Ares IO Done")},
  56         {HKEY("C-Ares Finished")},
  57         {HKEY("C-Ares exit")},
  58         {HKEY("Killing")},
  59         {HKEY("Exit")}
  60 };
  61
  62 void SetEVState(AsyncIO *IO, eIOState State)
  63 {
  64
  65         CitContext* CCC = IO->CitContext;
  66         if (CCC != NULL)
  67                 memcpy(CCC->lastcmdname, IOStates[State].Key, IOStates[State].len + 1);
  68
  69 }
  70
  71 eNextState QueueAnEventContext(AsyncIO *IO);
  72 static void IO_Timeout_callback(struct ev_loop *loop, ev_timer *watcher, int revents);
  73 static void IO_abort_shutdown_callback(struct ev_loop *loop,
  74                                        ev_cleanup *watcher,
  75                                        int revents);
  76
  77
  78 /*------------------------------------------------------------------------------
  79  *                              Server DB IO
  80  *----------------------------------------------------------------------------*/
  81 extern int evdb_count;
  82 extern pthread_mutex_t DBEventQueueMutex;
  83 extern pthread_mutex_t DBEventExitQueueMutex;
  84 extern HashList *DBInboundEventQueue;
  85 extern struct ev_loop *event_db;
  86 extern ev_async DBAddJob;
  87 extern ev_async DBExitEventLoop;
  88
  89 eNextState QueueAnDBOperation(AsyncIO *IO)
  90 {
  91         IOAddHandler *h;
  92         int i;
  93
  94         SetEVState(IO, eDBQ);
  95         h = (IOAddHandler*)malloc(sizeof(IOAddHandler));
  96         h->IO = IO;
  97
  98         assert(IO->ReAttachCB != NULL);
  99
 100         h->EvAttch = IO->ReAttachCB;
 101         ev_cleanup_init(&IO->db_abort_by_shutdown,
 102                         IO_abort_shutdown_callback);
 103         IO->db_abort_by_shutdown.data = IO;
 104
 105         pthread_mutex_lock(&DBEventQueueMutex);
 106         if (DBInboundEventQueue == NULL)
 107         {
 108                 /* shutting down... */
 109                 free(h);
 110                 EVM_syslog(LOG_DEBUG, "DBEVENT Q exiting.\n");
 111                 pthread_mutex_unlock(&DBEventQueueMutex);
 112                 return eAbort;
 113         }
 114         EVM_syslog(LOG_DEBUG, "DBEVENT Q\n");
 115         i = ++evdb_count ;
 116         Put(DBInboundEventQueue, IKEY(i), h, NULL);
 117         pthread_mutex_unlock(&DBEventQueueMutex);
 118
 119         pthread_mutex_lock(&DBEventExitQueueMutex);
 120         if (event_db == NULL)
 121         {
 122                 pthread_mutex_unlock(&DBEventExitQueueMutex);
 123                 return eAbort;
 124         }
 125         ev_async_send (event_db, &DBAddJob);
 126         pthread_mutex_unlock(&DBEventExitQueueMutex);
 127
 128         EVQM_syslog(LOG_DEBUG, "DBEVENT Q Done.\n");
 129         return eDBQuery;
 130 }
 131
 132 void StopDBWatchers(AsyncIO *IO)
 133 {
 134         SetEVState(IO, eDBStop);
 135         ev_cleanup_stop(event_db, &IO->db_abort_by_shutdown);
 136         ev_idle_stop(event_db, &IO->db_unwind_stack);
 137 }
 138
 139 void ShutDownDBCLient(AsyncIO *IO)
 140 {
 141         CitContext *Ctx =IO->CitContext;
 142         become_session(Ctx);
 143
 144         SetEVState(IO, eDBTerm);
 145         EVM_syslog(LOG_DEBUG, "DBEVENT Terminating.\n");
 146         StopDBWatchers(IO);
 147
 148         assert(IO->DBTerminate);
 149         IO->DBTerminate(IO);
 150 }
 151
 152 void
 153 DB_PerformNext(struct ev_loop *loop, ev_idle *watcher, int revents)
 154 {
 155         AsyncIO *IO = watcher->data;
 156
 157         SetEVState(IO, eDBNext);
 158         IO->Now = ev_now(event_db);
 159         EV_syslog(LOG_DEBUG, "%s()", __FUNCTION__);
 160         become_session(IO->CitContext);
 161
 162         ev_idle_stop(event_db, &IO->db_unwind_stack);
 163
 164         assert(IO->NextDBOperation);
 165         switch (IO->NextDBOperation(IO))
 166         {
 167         case eSendReply:
 168                 ev_cleanup_stop(loop, &IO->db_abort_by_shutdown);
 169                 QueueAnEventContext(IO);
 170                 break;
 171         case eDBQuery:
 172                 break;
 173         case eSendDNSQuery:
 174         case eReadDNSReply:
 175         case eConnect:
 176         case eSendMore:
 177         case eSendFile:
 178         case eReadMessage:
 179         case eReadMore:
 180         case eReadPayload:
 181         case eReadFile:
 182                 ev_cleanup_stop(loop, &IO->db_abort_by_shutdown);
 183                 break;
 184         case eTerminateConnection:
 185         case eAbort:
 186                 ev_idle_stop(event_db, &IO->db_unwind_stack);
 187                 ev_cleanup_stop(loop, &IO->db_abort_by_shutdown);
 188                 ShutDownDBCLient(IO);
 189         }
 190 }
 191
 192 eNextState NextDBOperation(AsyncIO *IO, IO_CallBack CB)
 193 {
 194         SetEVState(IO, eQDBNext);
 195         IO->NextDBOperation = CB;
 196         ev_idle_init(&IO->db_unwind_stack,
 197                      DB_PerformNext);
 198         IO->db_unwind_stack.data = IO;
 199         ev_idle_start(event_db, &IO->db_unwind_stack);
 200         return eDBQuery;
 201 }
 202
 203 /*------------------------------------------------------------------------------
 204  *                      Client IO
 205  *----------------------------------------------------------------------------*/
 206 extern int evbase_count;
 207 extern pthread_mutex_t EventQueueMutex;
 208 extern pthread_mutex_t EventExitQueueMutex;
 209 extern HashList *InboundEventQueue;
 210 extern struct ev_loop *event_base;
 211 extern ev_async AddJob;
 212 extern ev_async ExitEventLoop;
 213
 214 static void IO_abort_shutdown_callback(struct ev_loop *loop,
 215                                        ev_cleanup *watcher,
 216                                        int revents)
 217 {
 218         AsyncIO *IO = watcher->data;
 219
 220         SetEVState(IO, eIOAbort);
 221         EV_syslog(LOG_DEBUG, "EVENT Q: %s\n", __FUNCTION__);
 222         IO->Now = ev_now(event_base);
 223         assert(IO->ShutdownAbort);
 224         IO->ShutdownAbort(IO);
 225 }
 226
 227
 228 eNextState QueueAnEventContext(AsyncIO *IO)
 229 {
 230         IOAddHandler *h;
 231         int i;
 232
 233         SetEVState(IO, eIOQ);
 234         h = (IOAddHandler*)malloc(sizeof(IOAddHandler));
 235         h->IO = IO;
 236
 237         assert(IO->ReAttachCB != NULL);
 238
 239         h->EvAttch = IO->ReAttachCB;
 240
 241         ev_cleanup_init(&IO->abort_by_shutdown,
 242                         IO_abort_shutdown_callback);
 243         IO->abort_by_shutdown.data = IO;
 244
 245         pthread_mutex_lock(&EventQueueMutex);
 246         if (InboundEventQueue == NULL)
 247         {
 248                 free(h);
 249                 /* shutting down... */
 250                 EVM_syslog(LOG_DEBUG, "EVENT Q exiting.\n");
 251                 pthread_mutex_unlock(&EventQueueMutex);
 252                 return eAbort;
 253         }
 254         EVM_syslog(LOG_DEBUG, "EVENT Q\n");
 255         i = ++evbase_count;
 256         Put(InboundEventQueue, IKEY(i), h, NULL);
 257         pthread_mutex_unlock(&EventQueueMutex);
 258
 259         pthread_mutex_lock(&EventExitQueueMutex);
 260         if (event_base == NULL) {
 261                 pthread_mutex_unlock(&EventExitQueueMutex);
 262                 return eAbort;
 263         }
 264         ev_async_send (event_base, &AddJob);
 265         pthread_mutex_unlock(&EventExitQueueMutex);
 266         EVM_syslog(LOG_DEBUG, "EVENT Q Done.\n");
 267         return eSendReply;
 268 }
 269
 270 eNextState EventQueueDBOperation(AsyncIO *IO, IO_CallBack CB, int CloseFDs)
 271 {
 272         StopClientWatchers(IO, CloseFDs);
 273         IO->ReAttachCB = CB;
 274         return eDBQuery;
 275 }
 276 eNextState DBQueueEventContext(AsyncIO *IO, IO_CallBack CB)
 277 {
 278         StopDBWatchers(IO);
 279         IO->ReAttachCB = CB;
 280         return eSendReply;
 281 }
 282
 283 eNextState QueueEventContext(AsyncIO *IO, IO_CallBack CB)
 284 {
 285         IO->ReAttachCB = CB;
 286         return QueueAnEventContext(IO);
 287 }
 288
 289 extern eNextState evcurl_handle_start(AsyncIO *IO);
 290
 291 eNextState QueueCurlContext(AsyncIO *IO)
 292 {
 293         IOAddHandler *h;
 294         int i;
 295
 296         SetEVState(IO, eCurlQ);
 297         h = (IOAddHandler*)malloc(sizeof(IOAddHandler));
 298         h->IO = IO;
 299         h->EvAttch = evcurl_handle_start;
 300
 301         pthread_mutex_lock(&EventQueueMutex);
 302         if (InboundEventQueue == NULL)
 303         {
 304                 /* shutting down... */
 305                 free(h);
 306                 EVM_syslog(LOG_DEBUG, "EVENT Q exiting.\n");
 307                 pthread_mutex_unlock(&EventQueueMutex);
 308                 return eAbort;
 309         }
 310
 311         EVM_syslog(LOG_DEBUG, "EVENT Q\n");
 312         i = ++evbase_count;
 313         Put(InboundEventQueue, IKEY(i), h, NULL);
 314         pthread_mutex_unlock(&EventQueueMutex);
 315
 316         pthread_mutex_lock(&EventExitQueueMutex);
 317         if (event_base == NULL) {
 318                 pthread_mutex_unlock(&EventExitQueueMutex);
 319                 return eAbort;
 320         }
 321         ev_async_send (event_base, &AddJob);
 322         pthread_mutex_unlock(&EventExitQueueMutex);
 323
 324         EVM_syslog(LOG_DEBUG, "EVENT Q Done.\n");
 325         return eSendReply;
 326 }
 327
 328 eNextState CurlQueueDBOperation(AsyncIO *IO, IO_CallBack CB)
 329 {
 330         StopCurlWatchers(IO);
 331         IO->ReAttachCB = CB;
 332         return eDBQuery;
 333 }
 334
 335
 336 void FreeAsyncIOContents(AsyncIO *IO)
 337 {
 338         CitContext *Ctx = IO->CitContext;
 339
 340         FreeStrBuf(&IO->IOBuf);
 341         FreeStrBuf(&IO->SendBuf.Buf);
 342         FreeStrBuf(&IO->RecvBuf.Buf);
 343
 344         FreeURL(&IO->ConnectMe);
 345         FreeStrBuf(&IO->HttpReq.ReplyData);
 346
 347         if (Ctx) {
 348                 Ctx->state = CON_IDLE;
 349                 Ctx->kill_me = 1;
 350                 IO->CitContext = NULL;
 351         }
 352 }
 353
 354
 355 void DestructCAres(AsyncIO *IO);
 356 void StopClientWatchers(AsyncIO *IO, int CloseFD)
 357 {
 358         EVM_syslog(LOG_DEBUG, "EVENT StopClientWatchers");
 359
 360         DestructCAres(IO);
 361
 362         ev_timer_stop (event_base, &IO->rw_timeout);
 363         ev_timer_stop(event_base, &IO->conn_fail);
 364         ev_idle_stop(event_base, &IO->unwind_stack);
 365         ev_cleanup_stop(event_base, &IO->abort_by_shutdown);
 366
 367         ev_io_stop(event_base, &IO->conn_event);
 368         ev_io_stop(event_base, &IO->send_event);
 369         ev_io_stop(event_base, &IO->recv_event);
 370
 371         if (CloseFD && (IO->SendBuf.fd > 0)) {
 372                 close(IO->SendBuf.fd);
 373                 IO->SendBuf.fd = 0;
 374                 IO->RecvBuf.fd = 0;
 375         }
 376 }
 377
 378 void StopCurlWatchers(AsyncIO *IO)
 379 {
 380         EVM_syslog(LOG_DEBUG, "EVENT StopCurlWatchers \n");
 381
 382         ev_timer_stop (event_base, &IO->rw_timeout);
 383         ev_timer_stop(event_base, &IO->conn_fail);
 384         ev_idle_stop(event_base, &IO->unwind_stack);
 385         ev_cleanup_stop(event_base, &IO->abort_by_shutdown);
 386
 387         ev_io_stop(event_base, &IO->conn_event);
 388         ev_io_stop(event_base, &IO->send_event);
 389         ev_io_stop(event_base, &IO->recv_event);
 390
 391         curl_easy_cleanup(IO->HttpReq.chnd);
 392         IO->HttpReq.chnd = NULL;
 393
 394         if (IO->SendBuf.fd != 0) {
 395                 close(IO->SendBuf.fd);
 396         }
 397         IO->SendBuf.fd = 0;
 398         IO->RecvBuf.fd = 0;
 399 }
 400
 401 eNextState ShutDownCLient(AsyncIO *IO)
 402 {
 403         CitContext *Ctx =IO->CitContext;
 404
 405         SetEVState(IO, eExit);
 406         become_session(Ctx);
 407
 408         EVM_syslog(LOG_DEBUG, "EVENT Terminating \n");
 409
 410         StopClientWatchers(IO, 1);
 411
 412         if (IO->DNS.Channel != NULL) {
 413                 ares_destroy(IO->DNS.Channel);
 414                 EV_DNS_LOG_STOP(DNS.recv_event);
 415                 EV_DNS_LOG_STOP(DNS.send_event);
 416                 ev_io_stop(event_base, &IO->DNS.recv_event);
 417                 ev_io_stop(event_base, &IO->DNS.send_event);
 418                 IO->DNS.Channel = NULL;
 419         }
 420         assert(IO->Terminate);
 421         return IO->Terminate(IO);
 422 }
 423
 424 void PostInbound(AsyncIO *IO)
 425 {
 426
 427         switch (IO->NextState) {
 428         case eSendFile:
 429                 ev_io_start(event_base, &IO->send_event);
 430                 break;
 431         case eSendReply:
 432         case eSendMore:
 433                 assert(IO->SendDone);
 434                 IO->NextState = IO->SendDone(IO);
 435                 switch (IO->NextState)
 436                 {
 437                 case eSendFile:
 438                 case eSendReply:
 439                 case eSendMore:
 440                 case eReadMessage:
 441                 case eReadPayload:
 442                 case eReadMore:
 443                 case eReadFile:
 444                         ev_io_start(event_base, &IO->send_event);
 445                         break;
 446                 case eDBQuery:
 447                         StopClientWatchers(IO, 0);
 448                         QueueAnDBOperation(IO);
 449                 default:
 450                         break;
 451                 }
 452                 break;
 453         case eReadPayload:
 454         case eReadMore:
 455         case eReadFile:
 456                 ev_io_start(event_base, &IO->recv_event);
 457                 break;
 458         case eTerminateConnection:
 459         case eAbort:
 460                 if (ShutDownCLient(IO) == eDBQuery) {
 461                         QueueAnDBOperation(IO);
 462                 }
 463                 break;
 464         case eSendDNSQuery:
 465         case eReadDNSReply:
 466         case eConnect:
 467         case eReadMessage:
 468                 break;
 469         case eDBQuery:
 470                 QueueAnDBOperation(IO);
 471         }
 472 }
 473 eReadState HandleInbound(AsyncIO *IO)
 474 {
 475         const char *Err = NULL;
 476         eReadState Finished = eBufferNotEmpty;
 477
 478         become_session(IO->CitContext);
 479
 480         while ((Finished == eBufferNotEmpty) &&
 481                ((IO->NextState == eReadMessage)||
 482                 (IO->NextState == eReadMore)||
 483                 (IO->NextState == eReadFile)||
 484                 (IO->NextState == eReadPayload)))
 485         {
 486                 /* Reading lines...
 487                  * lex line reply in callback,
 488                  * or do it ourselves.
 489                  * i.e. as nnn-blabla means continue reading in SMTP
 490                  */
 491                 if ((IO->NextState == eReadFile) &&
 492                     (Finished == eBufferNotEmpty))
 493                 {
 494                         Finished = WriteIOBAlreadyRead(&IO->IOB, &Err);
 495                         if (Finished == eReadSuccess)
 496                         {
 497                                 IO->NextState = eSendReply;
 498                         }
 499                 }
 500                 else if (IO->LineReader)
 501                         Finished = IO->LineReader(IO);
 502                 else
 503                         Finished = StrBufChunkSipLine(IO->IOBuf,
 504                                                       &IO->RecvBuf);
 505
 506                 switch (Finished) {
 507                 case eMustReadMore: /// read new from socket...
 508                         break;
 509                 case eBufferNotEmpty: /* shouldn't happen... */
 510                 case eReadSuccess: /// done for now...
 511                         break;
 512                 case eReadFail: /// WHUT?
 513                                 ///todo: shut down!
 514                         break;
 515                 }
 516
 517                 if (Finished != eMustReadMore) {
 518                         ev_io_stop(event_base, &IO->recv_event);
 519                         IO->NextState = IO->ReadDone(IO);
 520                         if  (IO->NextState == eDBQuery) {
 521                                 return QueueAnDBOperation(IO);
 522                         }
 523                         else {
 524                                 Finished = StrBufCheckBuffer(&IO->RecvBuf);
 525                         }
 526                 }
 527         }
 528
 529         PostInbound(IO);
 530
 531         return Finished;
 532 }
 533
 534
 535 static void
 536 IO_send_callback(struct ev_loop *loop, ev_io *watcher, int revents)
 537 {
 538         int rc;
 539         AsyncIO *IO = watcher->data;
 540         const char *errmsg = NULL;
 541
 542         IO->Now = ev_now(event_base);
 543         become_session(IO->CitContext);
 544 #ifdef BIGBAD_IODBG
 545         {
 546                 int rv = 0;
 547                 char fn [SIZ];
 548                 FILE *fd;
 549                 const char *pch = ChrPtr(IO->SendBuf.Buf);
 550                 const char *pchh = IO->SendBuf.ReadWritePointer;
 551                 long nbytes;
 552
 553                 if (pchh == NULL)
 554                         pchh = pch;
 555
 556                 nbytes = StrLength(IO->SendBuf.Buf) - (pchh - pch);
 557                 snprintf(fn, SIZ, "/tmp/foolog_ev_%s.%d",
 558                          ((CitContext*)(IO->CitContext))->ServiceName,
 559                          IO->SendBuf.fd);
 560
 561                 fd = fopen(fn, "a+");
 562                 fprintf(fd, "Send: BufSize: %ld BufContent: [",
 563                         nbytes);
 564                 rv = fwrite(pchh, nbytes, 1, fd);
 565                 if (!rv) printf("failed to write debug to %s!\n", fn);
 566                 fprintf(fd, "]\n");
 567 #endif
 568                 switch (IO->NextState) {
 569                 case eSendFile:
 570                         rc = FileSendChunked(&IO->IOB, &errmsg);
 571                         if (rc < 0)
 572                                 StrBufPlain(IO->ErrMsg, errmsg, -1);
 573                         break;
 574                 default:
 575                         rc = StrBuf_write_one_chunk_callback(IO->SendBuf.fd,
 576                                                              0,
 577                                                              &IO->SendBuf);
 578                 }
 579
 580 #ifdef BIGBAD_IODBG
 581                 fprintf(fd, "Sent: BufSize: %d bytes.\n", rc);
 582                 fclose(fd);
 583         }
 584 #endif
 585         if (rc == 0)
 586         {
 587                 ev_io_stop(event_base, &IO->send_event);
 588                 switch (IO->NextState) {
 589                 case eSendMore:
 590                         assert(IO->SendDone);
 591                         IO->NextState = IO->SendDone(IO);
 592
 593                         if ((IO->NextState == eTerminateConnection) ||
 594                             (IO->NextState == eAbort) )
 595                                 ShutDownCLient(IO);
 596                         else {
 597                                 ev_io_start(event_base, &IO->send_event);
 598                         }
 599                         break;
 600                 case eSendFile:
 601                         if (IO->IOB.ChunkSendRemain > 0) {
 602                                 ev_io_start(event_base, &IO->recv_event);
 603                                 SetNextTimeout(IO, 100.0);
 604
 605                         } else {
 606                                 assert(IO->ReadDone);
 607                                 IO->NextState = IO->ReadDone(IO);
 608                                 switch(IO->NextState) {
 609                                 case eSendDNSQuery:
 610                                 case eReadDNSReply:
 611                                 case eDBQuery:
 612                                 case eConnect:
 613                                         break;
 614                                 case eSendReply:
 615                                 case eSendMore:
 616                                 case eSendFile:
 617                                         ev_io_start(event_base,
 618                                                     &IO->send_event);
 619                                         break;
 620                                 case eReadMessage:
 621                                 case eReadMore:
 622                                 case eReadPayload:
 623                                 case eReadFile:
 624                                         break;
 625                                 case eTerminateConnection:
 626                                 case eAbort:
 627                                         break;
 628                                 }
 629                         }
 630                         break;
 631                 case eSendReply:
 632                     if (StrBufCheckBuffer(&IO->SendBuf) != eReadSuccess)
 633                         break;
 634                     IO->NextState = eReadMore;
 635                 case eReadMore:
 636                 case eReadMessage:
 637                 case eReadPayload:
 638                 case eReadFile:
 639                         if (StrBufCheckBuffer(&IO->RecvBuf) == eBufferNotEmpty)
 640                         {
 641                                 HandleInbound(IO);
 642                         }
 643                         else {
 644                                 ev_io_start(event_base, &IO->recv_event);
 645                         }
 646
 647                         break;
 648                 case eDBQuery:
 649                         /*
 650                          * we now live in another queue,
 651                          * so we have to unregister.
 652                          */
 653                         ev_cleanup_stop(loop, &IO->abort_by_shutdown);
 654                         break;
 655                 case eSendDNSQuery:
 656                 case eReadDNSReply:
 657                 case eConnect:
 658                 case eTerminateConnection:
 659                 case eAbort:
 660                         break;
 661                 }
 662         }
 663         else if (rc < 0) {
 664                 if (errno != EAGAIN) {
 665                         StopClientWatchers(IO, 1);
 666                         EV_syslog(LOG_DEBUG,
 667                                   "IO_send_callback(): Socket Invalid! [%d] [%s] [%d]\n",
 668                                   errno, strerror(errno), IO->SendBuf.fd);
 669                         StrBufPrintf(IO->ErrMsg,
 670                                      "Socket Invalid! [%s]",
 671                                      strerror(errno));
 672                         SetNextTimeout(IO, 0.01);
 673                 }
 674         }
 675         /* else : must write more. */
 676 }
 677 static void
 678 set_start_callback(struct ev_loop *loop, AsyncIO *IO, int revents)
 679 {
 680         ev_timer_stop(event_base, &IO->conn_fail);
 681         ev_timer_start(event_base, &IO->rw_timeout);
 682
 683         switch(IO->NextState) {
 684         case eReadMore:
 685         case eReadMessage:
 686         case eReadFile:
 687                 StrBufAppendBufPlain(IO->ErrMsg, HKEY("[while waiting for greeting]"), 0);
 688                 ev_io_start(event_base, &IO->recv_event);
 689                 break;
 690         case eSendReply:
 691         case eSendMore:
 692         case eReadPayload:
 693         case eSendFile:
 694                 become_session(IO->CitContext);
 695                 IO_send_callback(loop, &IO->send_event, revents);
 696                 break;
 697         case eDBQuery:
 698         case eSendDNSQuery:
 699         case eReadDNSReply:
 700         case eConnect:
 701         case eTerminateConnection:
 702         case eAbort:
 703                 /// TODO: WHUT?
 704                 break;
 705         }
 706 }
 707
 708 static void
 709 IO_Timeout_callback(struct ev_loop *loop, ev_timer *watcher, int revents)
 710 {
 711         AsyncIO *IO = watcher->data;
 712
 713         SetEVState(IO, eIOTimeout);
 714         IO->Now = ev_now(event_base);
 715         ev_timer_stop (event_base, &IO->rw_timeout);
 716         become_session(IO->CitContext);
 717
 718         if (IO->SendBuf.fd != 0)
 719         {
 720                 ev_io_stop(event_base, &IO->send_event);
 721                 ev_io_stop(event_base, &IO->recv_event);
 722                 ev_timer_stop (event_base, &IO->rw_timeout);
 723                 close(IO->SendBuf.fd);
 724                 IO->SendBuf.fd = IO->RecvBuf.fd = 0;
 725         }
 726
 727         assert(IO->Timeout);
 728         switch (IO->Timeout(IO))
 729         {
 730         case eAbort:
 731                 ShutDownCLient(IO);
 732         default:
 733                 break;
 734         }
 735 }
 736
 737 static void
 738 IO_connfail_callback(struct ev_loop *loop, ev_timer *watcher, int revents)
 739 {
 740         AsyncIO *IO = watcher->data;
 741
 742         SetEVState(IO, eIOConnfail);
 743         IO->Now = ev_now(event_base);
 744         ev_timer_stop (event_base, &IO->conn_fail);
 745
 746         if (IO->SendBuf.fd != 0)
 747         {
 748                 ev_io_stop(loop, &IO->conn_event);
 749                 ev_io_stop(event_base, &IO->send_event);
 750                 ev_io_stop(event_base, &IO->recv_event);
 751                 ev_timer_stop (event_base, &IO->rw_timeout);
 752                 close(IO->SendBuf.fd);
 753                 IO->SendBuf.fd = IO->RecvBuf.fd = 0;
 754         }
 755         become_session(IO->CitContext);
 756
 757         assert(IO->ConnFail);
 758         switch (IO->ConnFail(IO))
 759         {
 760         case eAbort:
 761                 ShutDownCLient(IO);
 762         default:
 763                 break;
 764
 765         }
 766 }
 767
 768 static void
 769 IO_connfailimmediate_callback(struct ev_loop *loop,
 770                               ev_idle *watcher,
 771                               int revents)
 772 {
 773         AsyncIO *IO = watcher->data;
 774
 775         SetEVState(IO, eIOConnfailNow);
 776         IO->Now = ev_now(event_base);
 777         ev_idle_stop (event_base, &IO->conn_fail_immediate);
 778
 779         if (IO->SendBuf.fd != 0)
 780         {
 781                 close(IO->SendBuf.fd);
 782                 IO->SendBuf.fd = IO->RecvBuf.fd = 0;
 783         }
 784         become_session(IO->CitContext);
 785
 786         assert(IO->ConnFail);
 787         switch (IO->ConnFail(IO))
 788         {
 789         case eAbort:
 790                 ShutDownCLient(IO);
 791         default:
 792                 break;
 793
 794         }
 795 }
 796
 797 static void
 798 IO_connestd_callback(struct ev_loop *loop, ev_io *watcher, int revents)
 799 {
 800         AsyncIO *IO = watcher->data;
 801         int             so_err = 0;
 802         socklen_t       lon = sizeof(so_err);
 803         int             err;
 804
 805         SetEVState(IO, eIOConnNow);
 806         IO->Now = ev_now(event_base);
 807         EVM_syslog(LOG_DEBUG, "connect() succeeded.\n");
 808
 809         ev_io_stop(loop, &IO->conn_event);
 810         ev_timer_stop(event_base, &IO->conn_fail);
 811
 812         err = getsockopt(IO->SendBuf.fd,
 813                          SOL_SOCKET,
 814                          SO_ERROR,
 815                          (void*)&so_err,
 816                          &lon);
 817
 818         if ((err == 0) && (so_err != 0))
 819         {
 820                 EV_syslog(LOG_DEBUG, "connect() failed [%d][%s]\n",
 821                           so_err,
 822                           strerror(so_err));
 823                 IO_connfail_callback(loop, &IO->conn_fail, revents);
 824
 825         }
 826         else
 827         {
 828                 EVM_syslog(LOG_DEBUG, "connect() succeeded\n");
 829                 set_start_callback(loop, IO, revents);
 830         }
 831 }
 832
 833 static void
 834 IO_recv_callback(struct ev_loop *loop, ev_io *watcher, int revents)
 835 {
 836         const char *errmsg;
 837         ssize_t nbytes;
 838         AsyncIO *IO = watcher->data;
 839
 840         IO->Now = ev_now(event_base);
 841         switch (IO->NextState) {
 842         case eReadFile:
 843                 nbytes = FileRecvChunked(&IO->IOB, &errmsg);
 844                 if (nbytes < 0)
 845                         StrBufPlain(IO->ErrMsg, errmsg, -1);
 846                 else
 847                 {
 848                         if (IO->IOB.ChunkSendRemain == 0)
 849                         {
 850                                 IO->NextState = eSendReply;
 851                                 assert(IO->ReadDone);
 852                                 ev_io_stop(event_base, &IO->recv_event);
 853                                 PostInbound(IO);
 854                                 return;
 855                         }
 856                         else
 857                                 return;
 858                 }
 859                 break;
 860         default:
 861                 nbytes = StrBuf_read_one_chunk_callback(IO->RecvBuf.fd,
 862                                                         0,
 863                                                         &IO->RecvBuf);
 864                 break;
 865         }
 866
 867 #ifdef BIGBAD_IODBG
 868         {
 869                 long nbytes;
 870                 int rv = 0;
 871                 char fn [SIZ];
 872                 FILE *fd;
 873                 const char *pch = ChrPtr(IO->RecvBuf.Buf);
 874                 const char *pchh = IO->RecvBuf.ReadWritePointer;
 875
 876                 if (pchh == NULL)
 877                         pchh = pch;
 878
 879                 nbytes = StrLength(IO->RecvBuf.Buf) - (pchh - pch);
 880                 snprintf(fn, SIZ, "/tmp/foolog_ev_%s.%d",
 881                          ((CitContext*)(IO->CitContext))->ServiceName,
 882                          IO->SendBuf.fd);
 883
 884                 fd = fopen(fn, "a+");
 885                 fprintf(fd, "Read: BufSize: %ld BufContent: [",
 886                         nbytes);
 887                 rv = fwrite(pchh, nbytes, 1, fd);
 888                 if (!rv) printf("failed to write debug to %s!\n", fn);
 889                 fprintf(fd, "]\n");
 890                 fclose(fd);
 891         }
 892 #endif
 893         if (nbytes > 0) {
 894                 HandleInbound(IO);
 895         } else if (nbytes == 0) {
 896                 StopClientWatchers(IO, 1);
 897                 SetNextTimeout(IO, 0.01);
 898                 return;
 899         } else if (nbytes == -1) {
 900                 if (errno != EAGAIN) {
 901                         // FD is gone. kick it.
 902                         StopClientWatchers(IO, 1);
 903                         EV_syslog(LOG_DEBUG,
 904                                   "IO_recv_callback(): Socket Invalid! [%d] [%s] [%d]\n",
 905                                   errno, strerror(errno), IO->SendBuf.fd);
 906                         StrBufPrintf(IO->ErrMsg,
 907                                      "Socket Invalid! [%s]",
 908                                      strerror(errno));
 909                         SetNextTimeout(IO, 0.01);
 910                 }
 911                 return;
 912         }
 913 }
 914
 915 void
 916 IO_postdns_callback(struct ev_loop *loop, ev_idle *watcher, int revents)
 917 {
 918         AsyncIO *IO = watcher->data;
 919
 920         SetEVState(IO, eCaresFinished);
 921         IO->Now = ev_now(event_base);
 922         EV_syslog(LOG_DEBUG, "event: %s\n", __FUNCTION__);
 923         become_session(IO->CitContext);
 924         assert(IO->DNS.Query->PostDNS);
 925         switch (IO->DNS.Query->PostDNS(IO))
 926         {
 927         case eAbort:
 928                 assert(IO->DNS.Fail);
 929                 switch (IO->DNS.Fail(IO)) {
 930                 case eAbort:
 931 ////                    StopClientWatchers(IO);
 932                         ShutDownCLient(IO);
 933                 default:
 934                         break;
 935                 }
 936         default:
 937                 break;
 938         }
 939 }
 940
 941
 942 eNextState EvConnectSock(AsyncIO *IO,
 943                          double conn_timeout,
 944                          double first_rw_timeout,
 945                          int ReadFirst)
 946 {
 947         struct sockaddr_in egress_sin;
 948         int fdflags;
 949         int rc = -1;
 950
 951         SetEVState(IO, eIOConnectSock);
 952         become_session(IO->CitContext);
 953
 954         if (ReadFirst) {
 955                 IO->NextState = eReadMessage;
 956         }
 957         else {
 958                 IO->NextState = eSendReply;
 959         }
 960
 961         IO->SendBuf.fd = IO->RecvBuf.fd =
 962                 socket(
 963                         (IO->ConnectMe->IPv6)?PF_INET6:PF_INET,
 964                         SOCK_STREAM,
 965                         IPPROTO_TCP);
 966
 967         if (IO->SendBuf.fd < 0) {
 968                 EV_syslog(LOG_ERR,
 969                           "EVENT: socket() failed: %s\n",
 970                           strerror(errno));
 971
 972                 StrBufPrintf(IO->ErrMsg,
 973                              "Failed to create socket: %s",
 974                              strerror(errno));
 975                 IO->SendBuf.fd = IO->RecvBuf.fd = 0;
 976                 return eAbort;
 977         }
 978         fdflags = fcntl(IO->SendBuf.fd, F_GETFL);
 979         if (fdflags < 0) {
 980                 EV_syslog(LOG_ERR,
 981                           "EVENT: unable to get socket %d flags! %s \n",
 982                           IO->SendBuf.fd,
 983                           strerror(errno));
 984                 StrBufPrintf(IO->ErrMsg,
 985                              "Failed to get socket %d flags: %s",
 986                              IO->SendBuf.fd,
 987                              strerror(errno));
 988                 close(IO->SendBuf.fd);
 989                 IO->SendBuf.fd = IO->RecvBuf.fd = 0;
 990                 return eAbort;
 991         }
 992         fdflags = fdflags | O_NONBLOCK;
 993         if (fcntl(IO->SendBuf.fd, F_SETFL, fdflags) < 0) {
 994                 EV_syslog(
 995                         LOG_ERR,
 996                         "EVENT: unable to set socket %d nonblocking flags! %s \n",
 997                         IO->SendBuf.fd,
 998                         strerror(errno));
 999                 StrBufPrintf(IO->ErrMsg,
1000                              "Failed to set socket flags: %s",
1001                              strerror(errno));
1002                 close(IO->SendBuf.fd);
1003                 IO->SendBuf.fd = IO->RecvBuf.fd = 0;
1004                 return eAbort;
1005         }
1006 /* TODO: maye we could use offsetof() to calc the position of data...
1007  * http://doc.dvgu.ru/devel/ev.html#associating_custom_data_with_a_watcher
1008  */
1009         ev_io_init(&IO->recv_event, IO_recv_callback, IO->RecvBuf.fd, EV_READ);
1010         IO->recv_event.data = IO;
1011         ev_io_init(&IO->send_event, IO_send_callback, IO->SendBuf.fd, EV_WRITE);
1012         IO->send_event.data = IO;
1013
1014         ev_timer_init(&IO->conn_fail, IO_connfail_callback, conn_timeout, 0);
1015         IO->conn_fail.data = IO;
1016         ev_timer_init(&IO->rw_timeout, IO_Timeout_callback, first_rw_timeout,0);
1017         IO->rw_timeout.data = IO;
1018
1019
1020
1021
1022         /* for debugging you may bypass it like this:
1023          * IO->Addr.sin_addr.s_addr = inet_addr("127.0.0.1");
1024          * ((struct sockaddr_in)IO->ConnectMe->Addr).sin_addr.s_addr =
1025          *   inet_addr("127.0.0.1");
1026          */
1027         if (IO->ConnectMe->IPv6) {
1028                 rc = connect(IO->SendBuf.fd,
1029                              &IO->ConnectMe->Addr,
1030                              sizeof(struct sockaddr_in6));
1031         }
1032         else {
1033                 /* If citserver is bound to a specific IP address on the host, make
1034                  * sure we use that address for outbound connections.
1035                  */
1036
1037                 memset(&egress_sin, 0, sizeof(egress_sin));
1038                 egress_sin.sin_family = AF_INET;
1039                 if (!IsEmptyStr(config.c_ip_addr)) {
1040                         egress_sin.sin_addr.s_addr = inet_addr(config.c_ip_addr);
1041                         if (egress_sin.sin_addr.s_addr == !INADDR_ANY) {
1042                                 egress_sin.sin_addr.s_addr = INADDR_ANY;
1043                         }
1044
1045                         /* If this bind fails, no problem; we can still use INADDR_ANY */
1046                         bind(IO->SendBuf.fd, (struct sockaddr *)&egress_sin, sizeof(egress_sin));
1047                 }
1048                 rc = connect(IO->SendBuf.fd,
1049                              (struct sockaddr_in *)&IO->ConnectMe->Addr,
1050                              sizeof(struct sockaddr_in));
1051         }
1052
1053         if (rc >= 0){
1054                 SetEVState(IO, eIOConnNow);
1055                 EV_syslog(LOG_DEBUG, "connect() = %d immediate success.\n", IO->SendBuf.fd);
1056                 set_start_callback(event_base, IO, 0);
1057                 return IO->NextState;
1058         }
1059         else if (errno == EINPROGRESS) {
1060                 SetEVState(IO, eIOConnWait);
1061                 EV_syslog(LOG_DEBUG, "connect() = %d have to wait now.\n", IO->SendBuf.fd);
1062
1063                 ev_io_init(&IO->conn_event,
1064                            IO_connestd_callback,
1065                            IO->SendBuf.fd,
1066                            EV_READ|EV_WRITE);
1067
1068                 IO->conn_event.data = IO;
1069
1070                 ev_io_start(event_base, &IO->conn_event);
1071                 ev_timer_start(event_base, &IO->conn_fail);
1072                 return IO->NextState;
1073         }
1074         else {
1075                 SetEVState(IO, eIOConnfail);
1076                 ev_idle_init(&IO->conn_fail_immediate,
1077                              IO_connfailimmediate_callback);
1078                 IO->conn_fail_immediate.data = IO;
1079                 ev_idle_start(event_base, &IO->conn_fail_immediate);
1080
1081                 EV_syslog(LOG_ERR,
1082                           "connect() = %d failed: %s\n",
1083                           IO->SendBuf.fd,
1084                           strerror(errno));
1085
1086                 StrBufPrintf(IO->ErrMsg,
1087                              "Failed to connect: %s",
1088                              strerror(errno));
1089                 return IO->NextState;
1090         }
1091         return IO->NextState;
1092 }
1093
1094 void SetNextTimeout(AsyncIO *IO, double timeout)
1095 {
1096         IO->rw_timeout.repeat = timeout;
1097         ev_timer_again (event_base,  &IO->rw_timeout);
1098 }
1099
1100
1101 eNextState ReAttachIO(AsyncIO *IO,
1102                       void *pData,
1103                       int ReadFirst)
1104 {
1105         SetEVState(IO, eIOAttach);
1106         IO->Data = pData;
1107         become_session(IO->CitContext);
1108         ev_cleanup_start(event_base, &IO->abort_by_shutdown);
1109         if (ReadFirst) {
1110                 IO->NextState = eReadMessage;
1111         }
1112         else {
1113                 IO->NextState = eSendReply;
1114         }
1115         set_start_callback(event_base, IO, 0);
1116
1117         return IO->NextState;
1118 }
1119
1120 void InitIOStruct(AsyncIO *IO,
1121                   void *Data,
1122                   eNextState NextState,
1123                   IO_LineReaderCallback LineReader,
1124                   IO_CallBack DNS_Fail,
1125                   IO_CallBack SendDone,
1126                   IO_CallBack ReadDone,
1127                   IO_CallBack Terminate,
1128                   IO_CallBack DBTerminate,
1129                   IO_CallBack ConnFail,
1130                   IO_CallBack Timeout,
1131                   IO_CallBack ShutdownAbort)
1132 {
1133         IO->Data          = Data;
1134
1135         IO->CitContext    = CloneContext(CC);
1136         IO->CitContext->session_specific_data = Data;
1137         IO->CitContext->IO = IO;
1138
1139         IO->NextState     = NextState;
1140
1141         IO->SendDone      = SendDone;
1142         IO->ReadDone      = ReadDone;
1143         IO->Terminate     = Terminate;
1144         IO->DBTerminate   = DBTerminate;
1145         IO->LineReader    = LineReader;
1146         IO->ConnFail      = ConnFail;
1147         IO->Timeout       = Timeout;
1148         IO->ShutdownAbort = ShutdownAbort;
1149
1150         IO->DNS.Fail      = DNS_Fail;
1151
1152         IO->SendBuf.Buf   = NewStrBufPlain(NULL, 1024);
1153         IO->RecvBuf.Buf   = NewStrBufPlain(NULL, 1024);
1154         IO->IOBuf         = NewStrBuf();
1155         EV_syslog(LOG_DEBUG,
1156                   "EVENT: Session lives at %p IO at %p \n",
1157                   Data, IO);
1158
1159 }
1160
1161 extern int evcurl_init(AsyncIO *IO);
1162
1163 int InitcURLIOStruct(AsyncIO *IO,
1164                      void *Data,
1165                      const char* Desc,
1166                      IO_CallBack SendDone,
1167                      IO_CallBack Terminate,
1168                      IO_CallBack DBTerminate,
1169                      IO_CallBack ShutdownAbort)
1170 {
1171         IO->Data          = Data;
1172
1173         IO->CitContext    = CloneContext(CC);
1174         IO->CitContext->session_specific_data = Data;
1175         IO->CitContext->IO = IO;
1176
1177         IO->SendDone      = SendDone;
1178         IO->Terminate     = Terminate;
1179         IO->DBTerminate   = DBTerminate;
1180         IO->ShutdownAbort = ShutdownAbort;
1181
1182         strcpy(IO->HttpReq.errdesc, Desc);
1183
1184
1185         return  evcurl_init(IO);
1186
1187 }
1188
1189
1190 typedef struct KillOtherSessionContext {
1191         AsyncIO IO;
1192         AsyncIO *OtherOne;
1193 }KillOtherSessionContext;
1194
1195 eNextState KillTerminate(AsyncIO *IO)
1196 {
1197         long id;
1198         KillOtherSessionContext *Ctx = (KillOtherSessionContext*)IO->Data;
1199         EV_syslog(LOG_DEBUG, "%s Exit\n", __FUNCTION__);
1200         id = IO->ID;
1201         FreeAsyncIOContents(IO);
1202         memset(Ctx, 0, sizeof(KillOtherSessionContext));
1203         IO->ID = id; /* just for the case we want to analyze it in a coredump */
1204         free(Ctx);
1205         return eAbort;
1206
1207 }
1208
1209 eNextState KillShutdown(AsyncIO *IO)
1210 {
1211         return eTerminateConnection;
1212 }
1213
1214 eNextState KillOtherContextNow(AsyncIO *IO)
1215 {
1216         KillOtherSessionContext *Ctx = IO->Data;
1217
1218         SetEVState(IO, eKill);
1219
1220         if (Ctx->OtherOne->ShutdownAbort != NULL)
1221                 Ctx->OtherOne->ShutdownAbort(Ctx->OtherOne);
1222         return eTerminateConnection;
1223 }
1224
1225 void KillAsyncIOContext(AsyncIO *IO)
1226 {
1227         KillOtherSessionContext *Ctx;
1228
1229         Ctx = (KillOtherSessionContext*) malloc(sizeof(KillOtherSessionContext));
1230         memset(Ctx, 0, sizeof(KillOtherSessionContext));
1231
1232         InitIOStruct(&Ctx->IO,
1233                      Ctx,
1234                      eReadMessage,
1235                      NULL,
1236                      NULL,
1237                      NULL,
1238                      NULL,
1239                      KillTerminate,
1240                      NULL,
1241                      NULL,
1242                      NULL,
1243                      KillShutdown);
1244
1245         Ctx->OtherOne = IO;
1246
1247         switch(IO->NextState) {
1248         case eSendDNSQuery:
1249         case eReadDNSReply:
1250
1251         case eConnect:
1252         case eSendReply:
1253         case eSendMore:
1254         case eSendFile:
1255
1256         case eReadMessage:
1257         case eReadMore:
1258         case eReadPayload:
1259         case eReadFile:
1260                 IO->ReAttachCB = KillOtherContextNow;
1261                 QueueAnEventContext(&Ctx->IO);
1262                 break;
1263         case eDBQuery:
1264                 IO->ReAttachCB = KillOtherContextNow;
1265                 QueueAnDBOperation(&Ctx->IO);
1266                 break;
1267         case eTerminateConnection:
1268         case eAbort:
1269                 /*hm, its already dying, dunno which Queue its in... */
1270                 free(Ctx);
1271         }
1272
1273 }
1274
1275 extern int DebugEventLoopBacktrace;
1276 void EV_backtrace(AsyncIO *IO)
1277 {
1278 #ifdef HAVE_BACKTRACE
1279         void *stack_frames[50];
1280         size_t size, i;
1281         char **strings;
1282
1283         if ((IO == NULL) || (DebugEventLoopBacktrace == 0))
1284                 return;
1285         size = backtrace(stack_frames, sizeof(stack_frames) / sizeof(void*));
1286         strings = backtrace_symbols(stack_frames, size);
1287         for (i = 0; i < size; i++) {
1288                 if (strings != NULL) {
1289                         EV_syslog(LOG_ALERT, " BT %s\n", strings[i]);
1290                 }
1291                 else {
1292                         EV_syslog(LOG_ALERT, " BT %p\n", stack_frames[i]);
1293                 }
1294         }
1295         free(strings);
1296 #endif
1297 }
1298
1299
1300 ev_tstamp ctdl_ev_now (void)
1301 {
1302         return ev_now(event_base);
1303 }