apt-pkg/acquire-worker.cc

   1 // -*- mode: cpp; mode: fold -*-
   2 // Description                                                          /*{{{*/
   3 // $Id: acquire-worker.cc,v 1.21 1999/04/20 05:02:09 jgg Exp $
   4 /* ######################################################################
   5
   6    Acquire Worker
   7
   8    The worker process can startup either as a Configuration prober
   9    or as a queue runner. As a configuration prober it only reads the
  10    configuration message and
  11
  12    ##################################################################### */
  13                                                                         /*}}}*/
  14 // Include Files                                                        /*{{{*/
  15 #ifdef __GNUG__
  16 #pragma implementation "apt-pkg/acquire-worker.h"
  17 #endif
  18 #include <apt-pkg/acquire-worker.h>
  19 #include <apt-pkg/acquire-item.h>
  20 #include <apt-pkg/configuration.h>
  21 #include <apt-pkg/error.h>
  22 #include <apt-pkg/fileutl.h>
  23 #include <apt-pkg/strutl.h>
  24
  25 #include <sys/stat.h>
  26 #include <unistd.h>
  27 #include <fcntl.h>
  28 #include <signal.h>
  29 #include <wait.h>
  30 #include <stdio.h>
  31 #include <errno.h>
  32                                                                         /*}}}*/
  33
  34 // Worker::Worker - Constructor for Queue startup                       /*{{{*/
  35 // ---------------------------------------------------------------------
  36 /* */
  37 pkgAcquire::Worker::Worker(Queue *Q,MethodConfig *Cnf,
  38                            pkgAcquireStatus *Log) : Log(Log)
  39 {
  40    OwnerQ = Q;
  41    Config = Cnf;
  42    Access = Cnf->Access;
  43    CurrentItem = 0;
  44
  45    Construct();
  46 }
  47                                                                         /*}}}*/
  48 // Worker::Worker - Constructor for method config startup               /*{{{*/
  49 // ---------------------------------------------------------------------
  50 /* */
  51 pkgAcquire::Worker::Worker(MethodConfig *Cnf)
  52 {
  53    OwnerQ = 0;
  54    Config = Cnf;
  55    Access = Cnf->Access;
  56    CurrentItem = 0;
  57
  58    Construct();
  59 }
  60                                                                         /*}}}*/
  61 // Worker::Construct - Constructor helper                               /*{{{*/
  62 // ---------------------------------------------------------------------
  63 /* */
  64 void pkgAcquire::Worker::Construct()
  65 {
  66    NextQueue = 0;
  67    NextAcquire = 0;
  68    Process = -1;
  69    InFd = -1;
  70    OutFd = -1;
  71    OutReady = false;
  72    InReady = false;
  73    Debug = _config->FindB("Debug::pkgAcquire::Worker",false);
  74 }
  75                                                                         /*}}}*/
  76 // Worker::~Worker - Destructor                                         /*{{{*/
  77 // ---------------------------------------------------------------------
  78 /* */
  79 pkgAcquire::Worker::~Worker()
  80 {
  81    close(InFd);
  82    close(OutFd);
  83
  84    if (Process > 0)
  85    {
  86       kill(Process,SIGINT);
  87       if (waitpid(Process,0,0) != Process)
  88          _error->Warning("I waited but nothing was there!");
  89    }
  90 }
  91                                                                         /*}}}*/
  92 // Worker::Start - Start the worker process                             /*{{{*/
  93 // ---------------------------------------------------------------------
  94 /* This forks the method and inits the communication channel */
  95 bool pkgAcquire::Worker::Start()
  96 {
  97    // Get the method path
  98    string Method = _config->FindDir("Dir::Bin::Methods") + Access;
  99    if (FileExists(Method) == false)
 100       return _error->Error("The method driver %s could not be found.",Method.c_str());
 101
 102    if (Debug == true)
 103       clog << "Starting method '" << Method << '\'' << endl;
 104
 105    // Create the pipes
 106    int Pipes[4] = {-1,-1,-1,-1};
 107    if (pipe(Pipes) != 0 || pipe(Pipes+2) != 0)
 108    {
 109       _error->Errno("pipe","Failed to create IPC pipe to subprocess");
 110       for (int I = 0; I != 4; I++)
 111          close(Pipes[I]);
 112       return false;
 113    }
 114    for (int I = 0; I != 4; I++)
 115       SetCloseExec(Pipes[0],true);
 116
 117    // Fork off the process
 118    Process = ExecFork();
 119
 120    // Spawn the subprocess
 121    if (Process == 0)
 122    {
 123       // Setup the FDs
 124       dup2(Pipes[1],STDOUT_FILENO);
 125       dup2(Pipes[2],STDIN_FILENO);
 126       dup2(((filebuf *)clog.rdbuf())->fd(),STDERR_FILENO);
 127       SetCloseExec(STDOUT_FILENO,false);
 128       SetCloseExec(STDIN_FILENO,false);
 129       SetCloseExec(STDERR_FILENO,false);
 130
 131       const char *Args[2];
 132       Args[0] = Method.c_str();
 133       Args[1] = 0;
 134       execv(Args[0],(char **)Args);
 135       cerr << "Failed to exec method " << Args[0] << endl;
 136       _exit(100);
 137    }
 138
 139    // Fix up our FDs
 140    InFd = Pipes[0];
 141    OutFd = Pipes[3];
 142    SetNonBlock(Pipes[0],true);
 143    SetNonBlock(Pipes[3],true);
 144    close(Pipes[1]);
 145    close(Pipes[2]);
 146    OutReady = false;
 147    InReady = true;
 148
 149    // Read the configuration data
 150    if (WaitFd(InFd) == false ||
 151        ReadMessages() == false)
 152       return _error->Error("Method %s did not start correctly",Method.c_str());
 153
 154    RunMessages();
 155    if (OwnerQ != 0)
 156       SendConfiguration();
 157
 158    return true;
 159 }
 160                                                                         /*}}}*/
 161 // Worker::ReadMessages - Read all pending messages into the list       /*{{{*/
 162 // ---------------------------------------------------------------------
 163 /* */
 164 bool pkgAcquire::Worker::ReadMessages()
 165 {
 166    if (::ReadMessages(InFd,MessageQueue) == false)
 167       return MethodFailure();
 168    return true;
 169 }
 170                                                                         /*}}}*/
 171 // Worker::RunMessage - Empty the message queue                         /*{{{*/
 172 // ---------------------------------------------------------------------
 173 /* This takes the messages from the message queue and runs them through
 174    the parsers in order. */
 175 bool pkgAcquire::Worker::RunMessages()
 176 {
 177    while (MessageQueue.empty() == false)
 178    {
 179       string Message = MessageQueue.front();
 180       MessageQueue.erase(MessageQueue.begin());
 181
 182       if (Debug == true)
 183          clog << " <- " << Access << ':' << QuoteString(Message,"\n") << endl;
 184
 185       // Fetch the message number
 186       char *End;
 187       int Number = strtol(Message.c_str(),&End,10);
 188       if (End == Message.c_str())
 189          return _error->Error("Invalid message from method %s: %s",Access.c_str(),Message.c_str());
 190
 191       string URI = LookupTag(Message,"URI");
 192       pkgAcquire::Queue::QItem *Itm = 0;
 193       if (URI.empty() == false)
 194          Itm = OwnerQ->FindItem(URI,this);
 195
 196       // Determine the message number and dispatch
 197       switch (Number)
 198       {
 199          // 100 Capabilities
 200          case 100:
 201          if (Capabilities(Message) == false)
 202             return _error->Error("Unable to process Capabilities message from %s",Access.c_str());
 203          break;
 204
 205          // 101 Log
 206          case 101:
 207          if (Debug == true)
 208             clog << " <- (log) " << LookupTag(Message,"Message") << endl;
 209          break;
 210
 211          // 102 Status
 212          case 102:
 213          Status = LookupTag(Message,"Message");
 214          break;
 215
 216          // 200 URI Start
 217          case 200:
 218          {
 219             if (Itm == 0)
 220             {
 221                _error->Error("Method gave invalid 200 URI Start message");
 222                break;
 223             }
 224
 225             CurrentItem = Itm;
 226             CurrentSize = 0;
 227             TotalSize = atoi(LookupTag(Message,"Size","0").c_str());
 228             Itm->Owner->Start(Message,atoi(LookupTag(Message,"Size","0").c_str()));
 229
 230             if (Log != 0)
 231                Log->Fetch(*Itm);
 232
 233             break;
 234          }
 235
 236          // 201 URI Done
 237          case 201:
 238          {
 239             if (Itm == 0)
 240             {
 241                _error->Error("Method gave invalid 201 URI Done message");
 242                break;
 243             }
 244
 245             pkgAcquire::Item *Owner = Itm->Owner;
 246             pkgAcquire::ItemDesc Desc = *Itm;
 247             OwnerQ->ItemDone(Itm);
 248             Owner->Done(Message,atoi(LookupTag(Message,"Size","0").c_str()),
 249                                           LookupTag(Message,"MD5-Hash"));
 250             ItemDone();
 251
 252             // Log that we are done
 253             if (Log != 0)
 254             {
 255                if (StringToBool(LookupTag(Message,"IMS-Hit"),false) == true ||
 256                    StringToBool(LookupTag(Message,"Alt-IMS-Hit"),false) == true)
 257                {
 258                   /* Hide 'hits' for local only sources - we also manage to
 259                      hide gets */
 260                   if (Config->LocalOnly == false)
 261                      Log->IMSHit(Desc);
 262                }
 263                else
 264                   Log->Done(Desc);
 265             }
 266             break;
 267          }
 268
 269          // 400 URI Failure
 270          case 400:
 271          {
 272             if (Itm == 0)
 273             {
 274                _error->Error("Method gave invalid 400 URI Failure message");
 275                break;
 276             }
 277
 278             pkgAcquire::Item *Owner = Itm->Owner;
 279             pkgAcquire::ItemDesc Desc = *Itm;
 280             OwnerQ->ItemDone(Itm);
 281             Owner->Failed(Message,Config);
 282             ItemDone();
 283
 284             if (Log != 0)
 285                Log->Fail(Desc);
 286
 287             break;
 288          }
 289
 290          // 401 General Failure
 291          case 401:
 292          _error->Error("Method %s General failure: %s",LookupTag(Message,"Message").c_str());
 293          break;
 294
 295          // 403 Media Change
 296          case 403:
 297          MediaChange(Message);
 298          break;
 299       }
 300    }
 301    return true;
 302 }
 303                                                                         /*}}}*/
 304 // Worker::Capabilities - 100 Capabilities handler                      /*{{{*/
 305 // ---------------------------------------------------------------------
 306 /* This parses the capabilities message and dumps it into the configuration
 307    structure. */
 308 bool pkgAcquire::Worker::Capabilities(string Message)
 309 {
 310    if (Config == 0)
 311       return true;
 312
 313    Config->Version = LookupTag(Message,"Version");
 314    Config->SingleInstance = StringToBool(LookupTag(Message,"Single-Instance"),false);
 315    Config->Pipeline = StringToBool(LookupTag(Message,"Pipeline"),false);
 316    Config->SendConfig = StringToBool(LookupTag(Message,"Send-Config"),false);
 317    Config->LocalOnly = StringToBool(LookupTag(Message,"Local-Only"),false);
 318
 319    // Some debug text
 320    if (Debug == true)
 321    {
 322       clog << "Configured access method " << Config->Access << endl;
 323       clog << "Version:" << Config->Version << " SingleInstance:" <<
 324          Config->SingleInstance <<
 325          " Pipeline:" << Config->Pipeline << " SendConfig:" <<
 326          Config->SendConfig << endl;
 327    }
 328
 329    return true;
 330 }
 331                                                                         /*}}}*/
 332 // Worker::MediaChange - Request a media change                         /*{{{*/
 333 // ---------------------------------------------------------------------
 334 /* */
 335 bool pkgAcquire::Worker::MediaChange(string Message)
 336 {
 337    if (Log == 0 || Log->MediaChange(LookupTag(Message,"Media"),
 338                                     LookupTag(Message,"Drive")) == false)
 339    {
 340       char S[300];
 341       sprintf(S,"603 Media Changed\nFailed: true\n\n");
 342       if (Debug == true)
 343          clog << " -> " << Access << ':' << QuoteString(S,"\n") << endl;
 344       OutQueue += S;
 345       OutReady = true;
 346       return true;
 347    }
 348
 349    char S[300];
 350    sprintf(S,"603 Media Changed\n\n");
 351    if (Debug == true)
 352       clog << " -> " << Access << ':' << QuoteString(S,"\n") << endl;
 353    OutQueue += S;
 354    OutReady = true;
 355    return true;
 356 }
 357                                                                         /*}}}*/
 358 // Worker::SendConfiguration - Send the config to the method            /*{{{*/
 359 // ---------------------------------------------------------------------
 360 /* */
 361 bool pkgAcquire::Worker::SendConfiguration()
 362 {
 363    if (Config->SendConfig == false)
 364       return true;
 365
 366    if (OutFd == -1)
 367       return false;
 368
 369    string Message = "601 Configuration\n";
 370    Message.reserve(2000);
 371
 372    /* Write out all of the configuration directives by walking the
 373       configuration tree */
 374    const Configuration::Item *Top = _config->Tree(0);
 375    for (; Top != 0;)
 376    {
 377       if (Top->Value.empty() == false)
 378       {
 379          string Line = "Config-Item: " + Top->FullTag() + "=";
 380          Line += QuoteString(Top->Value,"\n") + '\n';
 381          Message += Line;
 382       }
 383
 384       if (Top->Child != 0)
 385       {
 386          Top = Top->Child;
 387          continue;
 388       }
 389
 390       while (Top != 0 && Top->Next == 0)
 391          Top = Top->Parent;
 392       if (Top != 0)
 393          Top = Top->Next;
 394    }
 395    Message += '\n';
 396
 397    if (Debug == true)
 398       clog << " -> " << Access << ':' << QuoteString(Message,"\n") << endl;
 399    OutQueue += Message;
 400    OutReady = true;
 401
 402    return true;
 403 }
 404                                                                         /*}}}*/
 405 // Worker::QueueItem - Add an item to the outbound queue                /*{{{*/
 406 // ---------------------------------------------------------------------
 407 /* Send a URI Acquire message to the method */
 408 bool pkgAcquire::Worker::QueueItem(pkgAcquire::Queue::QItem *Item)
 409 {
 410    if (OutFd == -1)
 411       return false;
 412
 413    string Message = "600 URI Acquire\n";
 414    Message.reserve(300);
 415    Message += "URI: " + Item->URI;
 416    Message += "\nFilename: " + Item->Owner->DestFile;
 417    Message += Item->Owner->Custom600Headers();
 418    Message += "\n\n";
 419
 420    if (Debug == true)
 421       clog << " -> " << Access << ':' << QuoteString(Message,"\n") << endl;
 422    OutQueue += Message;
 423    OutReady = true;
 424
 425    return true;
 426 }
 427                                                                         /*}}}*/
 428 // Worker::OutFdRead - Out bound FD is ready                            /*{{{*/
 429 // ---------------------------------------------------------------------
 430 /* */
 431 bool pkgAcquire::Worker::OutFdReady()
 432 {
 433    int Res;
 434    do
 435    {
 436       Res = write(OutFd,OutQueue.begin(),OutQueue.length());
 437    }
 438    while (Res < 0 && errno == EINTR);
 439
 440    if (Res <= 0)
 441       return MethodFailure();
 442
 443    // Hmm.. this should never happen.
 444    if (Res < 0)
 445       return true;
 446
 447    OutQueue.erase(0,Res);
 448    if (OutQueue.empty() == true)
 449       OutReady = false;
 450
 451    return true;
 452 }
 453                                                                         /*}}}*/
 454 // Worker::InFdRead - In bound FD is ready                              /*{{{*/
 455 // ---------------------------------------------------------------------
 456 /* */
 457 bool pkgAcquire::Worker::InFdReady()
 458 {
 459    if (ReadMessages() == false)
 460       return false;
 461    RunMessages();
 462    return true;
 463 }
 464                                                                         /*}}}*/
 465 // Worker::MethodFailure - Called when the method fails                 /*{{{*/
 466 // ---------------------------------------------------------------------
 467 /* This is called when the method is belived to have failed, probably because
 468    read returned -1. */
 469 bool pkgAcquire::Worker::MethodFailure()
 470 {
 471    _error->Error("Method %s has died unexpectedly!",Access.c_str());
 472
 473    if (waitpid(Process,0,0) != Process)
 474       _error->Warning("I waited but nothing was there!");
 475    Process = -1;
 476    close(InFd);
 477    close(OutFd);
 478    InFd = -1;
 479    OutFd = -1;
 480    OutReady = false;
 481    InReady = false;
 482    OutQueue = string();
 483    MessageQueue.erase(MessageQueue.begin(),MessageQueue.end());
 484
 485    return false;
 486 }
 487                                                                         /*}}}*/
 488 // Worker::Pulse - Called periodically                                  /*{{{*/
 489 // ---------------------------------------------------------------------
 490 /* */
 491 void pkgAcquire::Worker::Pulse()
 492 {
 493    if (CurrentItem == 0)
 494       return;
 495
 496    struct stat Buf;
 497    if (stat(CurrentItem->Owner->DestFile.c_str(),&Buf) != 0)
 498       return;
 499    CurrentSize = Buf.st_size;
 500 }
 501                                                                         /*}}}*/
 502 // Worker::ItemDone - Called when the current item is finished          /*{{{*/
 503 // ---------------------------------------------------------------------
 504 /* */
 505 void pkgAcquire::Worker::ItemDone()
 506 {
 507    CurrentItem = 0;
 508    CurrentSize = 0;
 509    TotalSize = 0;
 510    Status = string();
 511 }
 512                                                                         /*}}}*/