apt-pkg/acquire-worker.cc

   1 // -*- mode: cpp; mode: fold -*-
   2 // Description                                                          /*{{{*/
   3 // $Id: acquire-worker.cc,v 1.14 1998/12/04 21:16:47 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 <strutl.h>
  24
  25 #include <sys/stat.h>
  26 #include <unistd.h>
  27 #include <signal.h>
  28 #include <wait.h>
  29 #include <stdio.h>
  30                                                                         /*}}}*/
  31
  32 // Worker::Worker - Constructor for Queue startup                       /*{{{*/
  33 // ---------------------------------------------------------------------
  34 /* */
  35 pkgAcquire::Worker::Worker(Queue *Q,MethodConfig *Cnf,
  36                            pkgAcquireStatus *Log) : Log(Log)
  37 {
  38    OwnerQ = Q;
  39    Config = Cnf;
  40    Access = Cnf->Access;
  41    CurrentItem = 0;
  42
  43    Construct();
  44 }
  45                                                                         /*}}}*/
  46 // Worker::Worker - Constructor for method config startup               /*{{{*/
  47 // ---------------------------------------------------------------------
  48 /* */
  49 pkgAcquire::Worker::Worker(MethodConfig *Cnf)
  50 {
  51    OwnerQ = 0;
  52    Config = Cnf;
  53    Access = Cnf->Access;
  54    CurrentItem = 0;
  55
  56    Construct();
  57 }
  58                                                                         /*}}}*/
  59 // Worker::Construct - Constructor helper                               /*{{{*/
  60 // ---------------------------------------------------------------------
  61 /* */
  62 void pkgAcquire::Worker::Construct()
  63 {
  64    NextQueue = 0;
  65    NextAcquire = 0;
  66    Process = -1;
  67    InFd = -1;
  68    OutFd = -1;
  69    OutReady = false;
  70    InReady = false;
  71    Debug = _config->FindB("Debug::pkgAcquire::Worker",false);
  72 }
  73                                                                         /*}}}*/
  74 // Worker::~Worker - Destructor                                         /*{{{*/
  75 // ---------------------------------------------------------------------
  76 /* */
  77 pkgAcquire::Worker::~Worker()
  78 {
  79    close(InFd);
  80    close(OutFd);
  81
  82    if (Process > 0)
  83    {
  84       kill(Process,SIGINT);
  85       if (waitpid(Process,0,0) != Process)
  86          _error->Warning("I waited but nothing was there!");
  87    }
  88 }
  89                                                                         /*}}}*/
  90 // Worker::Start - Start the worker process                             /*{{{*/
  91 // ---------------------------------------------------------------------
  92 /* This forks the method and inits the communication channel */
  93 bool pkgAcquire::Worker::Start()
  94 {
  95    // Get the method path
  96    string Method = _config->FindDir("Dir::Bin::Methods") + Access;
  97    if (FileExists(Method) == false)
  98       return _error->Error("The method driver %s could not be found.",Method.c_str());
  99
 100    if (Debug == true)
 101       clog << "Starting method '" << Method << '\'' << endl;
 102
 103    // Create the pipes
 104    int Pipes[4] = {-1,-1,-1,-1};
 105    if (pipe(Pipes) != 0 || pipe(Pipes+2) != 0)
 106    {
 107       _error->Errno("pipe","Failed to create IPC pipe to subprocess");
 108       for (int I = 0; I != 4; I++)
 109          close(Pipes[I]);
 110       return false;
 111    }
 112    for (int I = 0; I != 4; I++)
 113       SetCloseExec(Pipes[0],true);
 114
 115    // Fork off the process
 116    Process = fork();
 117    if (Process < 0)
 118    {
 119       cerr << "FATAL -> Failed to fork." << endl;
 120       exit(100);
 121    }
 122
 123    // Spawn the subprocess
 124    if (Process == 0)
 125    {
 126       // Setup the FDs
 127       dup2(Pipes[1],STDOUT_FILENO);
 128       dup2(Pipes[2],STDIN_FILENO);
 129       dup2(((filebuf *)clog.rdbuf())->fd(),STDERR_FILENO);
 130       SetCloseExec(STDOUT_FILENO,false);
 131       SetCloseExec(STDIN_FILENO,false);
 132       SetCloseExec(STDERR_FILENO,false);
 133
 134       const char *Args[2];
 135       Args[0] = Method.c_str();
 136       Args[1] = 0;
 137       execv(Args[0],(char **)Args);
 138       cerr << "Failed to exec method " << Args[0] << endl;
 139       exit(100);
 140    }
 141
 142    // Fix up our FDs
 143    InFd = Pipes[0];
 144    OutFd = Pipes[3];
 145    SetNonBlock(Pipes[0],true);
 146    SetNonBlock(Pipes[3],true);
 147    close(Pipes[1]);
 148    close(Pipes[2]);
 149    OutReady = false;
 150    InReady = true;
 151
 152    // Read the configuration data
 153    if (WaitFd(InFd) == false ||
 154        ReadMessages() == false)
 155       return _error->Error("Method %s did not start correctly",Method.c_str());
 156
 157    RunMessages();
 158    if (OwnerQ != 0)
 159       SendConfiguration();
 160
 161    return true;
 162 }
 163                                                                         /*}}}*/
 164 // Worker::ReadMessages - Read all pending messages into the list       /*{{{*/
 165 // ---------------------------------------------------------------------
 166 /* */
 167 bool pkgAcquire::Worker::ReadMessages()
 168 {
 169    if (::ReadMessages(InFd,MessageQueue) == false)
 170       return MethodFailure();
 171    return true;
 172 }
 173                                                                         /*}}}*/
 174 // Worker::RunMessage - Empty the message queue                         /*{{{*/
 175 // ---------------------------------------------------------------------
 176 /* This takes the messages from the message queue and runs them through
 177    the parsers in order. */
 178 bool pkgAcquire::Worker::RunMessages()
 179 {
 180    while (MessageQueue.empty() == false)
 181    {
 182       string Message = MessageQueue.front();
 183       MessageQueue.erase(MessageQueue.begin());
 184
 185       if (Debug == true)
 186          clog << " <- " << Access << ':' << QuoteString(Message,"\n") << endl;
 187
 188       // Fetch the message number
 189       char *End;
 190       int Number = strtol(Message.c_str(),&End,10);
 191       if (End == Message.c_str())
 192          return _error->Error("Invalid message from method %s: %s",Access.c_str(),Message.c_str());
 193
 194       string URI = LookupTag(Message,"URI");
 195       pkgAcquire::Queue::QItem *Itm = 0;
 196       if (URI.empty() == false)
 197          Itm = OwnerQ->FindItem(URI,this);
 198
 199       // Determine the message number and dispatch
 200       switch (Number)
 201       {
 202          // 100 Capabilities
 203          case 100:
 204          if (Capabilities(Message) == false)
 205             return _error->Error("Unable to process Capabilities message from %s",Access.c_str());
 206          break;
 207
 208          // 101 Log
 209          case 101:
 210          if (Debug == true)
 211             clog << " <- (log) " << LookupTag(Message,"Message") << endl;
 212          break;
 213
 214          // 102 Status
 215          case 102:
 216          Status = LookupTag(Message,"Message");
 217          break;
 218
 219          // 200 URI Start
 220          case 200:
 221          {
 222             if (Itm == 0)
 223             {
 224                _error->Error("Method gave invalid 200 URI Start message");
 225                break;
 226             }
 227
 228             CurrentItem = Itm;
 229             CurrentSize = 0;
 230             TotalSize = atoi(LookupTag(Message,"Size","0").c_str());
 231             Itm->Owner->Start(Message,atoi(LookupTag(Message,"Size","0").c_str()));
 232
 233             if (Log != 0)
 234                Log->Fetch(*Itm);
 235
 236             break;
 237          }
 238
 239          // 201 URI Done
 240          case 201:
 241          {
 242             if (Itm == 0)
 243             {
 244                _error->Error("Method gave invalid 201 URI Done message");
 245                break;
 246             }
 247
 248             pkgAcquire::Item *Owner = Itm->Owner;
 249             pkgAcquire::ItemDesc Desc = *Itm;
 250             OwnerQ->ItemDone(Itm);
 251             Owner->Done(Message,atoi(LookupTag(Message,"Size","0").c_str()),
 252                                           LookupTag(Message,"MD5-Hash"));
 253             ItemDone();
 254
 255             // Log that we are done
 256             if (Log != 0)
 257             {
 258                if (StringToBool(LookupTag(Message,"IMS-Hit"),false) == true ||
 259                    StringToBool(LookupTag(Message,"Alt-IMS-Hit"),false) == true)
 260                   Log->IMSHit(Desc);
 261                else
 262                   Log->Done(Desc);
 263             }
 264             break;
 265          }
 266
 267          // 400 URI Failure
 268          case 400:
 269          {
 270             if (Itm == 0)
 271             {
 272                _error->Error("Method gave invalid 400 URI Failure message");
 273                break;
 274             }
 275
 276             pkgAcquire::Item *Owner = Itm->Owner;
 277             pkgAcquire::ItemDesc Desc = *Itm;
 278             OwnerQ->ItemDone(Itm);
 279             Owner->Failed(Message);
 280             ItemDone();
 281
 282             if (Log != 0)
 283                Log->Fail(Desc);
 284
 285             break;
 286          }
 287
 288          // 401 General Failure
 289          case 401:
 290          _error->Error("Method %s General failure: %s",LookupTag(Message,"Message").c_str());
 291          break;
 292
 293          // 403 Media Change
 294          case 403:
 295          MediaChange(Message);
 296          break;
 297       }
 298    }
 299    return true;
 300 }
 301                                                                         /*}}}*/
 302 // Worker::Capabilities - 100 Capabilities handler                      /*{{{*/
 303 // ---------------------------------------------------------------------
 304 /* This parses the capabilities message and dumps it into the configuration
 305    structure. */
 306 bool pkgAcquire::Worker::Capabilities(string Message)
 307 {
 308    if (Config == 0)
 309       return true;
 310
 311    Config->Version = LookupTag(Message,"Version");
 312    Config->SingleInstance = StringToBool(LookupTag(Message,"Single-Instance"),false);
 313    Config->Pipeline = StringToBool(LookupTag(Message,"Pipeline"),false);
 314    Config->SendConfig = StringToBool(LookupTag(Message,"Send-Config"),false);
 315    Config->LocalOnly = StringToBool(LookupTag(Message,"Local-Only"),false);
 316
 317    // Some debug text
 318    if (Debug == true)
 319    {
 320       clog << "Configured access method " << Config->Access << endl;
 321       clog << "Version:" << Config->Version << " SingleInstance:" <<
 322          Config->SingleInstance <<
 323          " Pipeline:" << Config->Pipeline << " SendConfig:" <<
 324          Config->SendConfig << endl;
 325    }
 326
 327    return true;
 328 }
 329                                                                         /*}}}*/
 330 // Worker::MediaChange - Request a media change                         /*{{{*/
 331 // ---------------------------------------------------------------------
 332 /* */
 333 bool pkgAcquire::Worker::MediaChange(string Message)
 334 {
 335    if (Log == 0 || Log->MediaChange(LookupTag(Message,"Media"),
 336                                     LookupTag(Message,"Drive")) == false)
 337    {
 338       char S[300];
 339       sprintf(S,"603 Media Changed\nFailed: true\n\n");
 340       if (Debug == true)
 341          clog << " -> " << Access << ':' << QuoteString(S,"\n") << endl;
 342       OutQueue += S;
 343       OutReady = true;
 344       return true;
 345    }
 346
 347    char S[300];
 348    sprintf(S,"603 Media Changed\n\n");
 349    if (Debug == true)
 350       clog << " -> " << Access << ':' << QuoteString(S,"\n") << endl;
 351    OutQueue += S;
 352    OutReady = true;
 353    return true;
 354 }
 355                                                                         /*}}}*/
 356 // Worker::SendConfiguration - Send the config to the method            /*{{{*/
 357 // ---------------------------------------------------------------------
 358 /* */
 359 bool pkgAcquire::Worker::SendConfiguration()
 360 {
 361    if (Config->SendConfig == false)
 362       return true;
 363
 364    if (OutFd == -1)
 365       return false;
 366
 367    string Message = "601 Configuration\n";
 368    Message.reserve(2000);
 369
 370    /* Write out all of the configuration directives by walking the
 371       configuration tree */
 372    const Configuration::Item *Top = _config->Tree(0);
 373    for (; Top != 0;)
 374    {
 375       if (Top->Value.empty() == false)
 376       {
 377          string Line = "Config-Item: " + Top->FullTag() + "=";
 378          Line += QuoteString(Top->Value,"\n") + '\n';
 379          Message += Line;
 380       }
 381
 382       if (Top->Child != 0)
 383       {
 384          Top = Top->Child;
 385          continue;
 386       }
 387
 388       while (Top != 0 && Top->Next == 0)
 389          Top = Top->Parent;
 390       if (Top != 0)
 391          Top = Top->Next;
 392    }
 393    Message += '\n';
 394
 395    if (Debug == true)
 396       clog << " -> " << Access << ':' << QuoteString(Message,"\n") << endl;
 397    OutQueue += Message;
 398    OutReady = true;
 399
 400    return true;
 401 }
 402                                                                         /*}}}*/
 403 // Worker::QueueItem - Add an item to the outbound queue                /*{{{*/
 404 // ---------------------------------------------------------------------
 405 /* Send a URI Acquire message to the method */
 406 bool pkgAcquire::Worker::QueueItem(pkgAcquire::Queue::QItem *Item)
 407 {
 408    if (OutFd == -1)
 409       return false;
 410
 411    string Message = "600 URI Acquire\n";
 412    Message.reserve(300);
 413    Message += "URI: " + Item->URI;
 414    Message += "\nFilename: " + Item->Owner->DestFile;
 415    Message += Item->Owner->Custom600Headers();
 416    Message += "\n\n";
 417
 418    if (Debug == true)
 419       clog << " -> " << Access << ':' << QuoteString(Message,"\n") << endl;
 420    OutQueue += Message;
 421    OutReady = true;
 422
 423    return true;
 424 }
 425                                                                         /*}}}*/
 426 // Worker::OutFdRead - Out bound FD is ready                            /*{{{*/
 427 // ---------------------------------------------------------------------
 428 /* */
 429 bool pkgAcquire::Worker::OutFdReady()
 430 {
 431    int Res = write(OutFd,OutQueue.begin(),OutQueue.length());
 432    if (Res <= 0)
 433       return MethodFailure();
 434
 435    // Hmm.. this should never happen.
 436    if (Res < 0)
 437       return true;
 438
 439    OutQueue.erase(0,Res);
 440    if (OutQueue.empty() == true)
 441       OutReady = false;
 442
 443    return true;
 444 }
 445                                                                         /*}}}*/
 446 // Worker::InFdRead - In bound FD is ready                              /*{{{*/
 447 // ---------------------------------------------------------------------
 448 /* */
 449 bool pkgAcquire::Worker::InFdReady()
 450 {
 451    if (ReadMessages() == false)
 452       return false;
 453    RunMessages();
 454    return true;
 455 }
 456                                                                         /*}}}*/
 457 // Worker::MethodFailure - Called when the method fails                 /*{{{*/
 458 // ---------------------------------------------------------------------
 459 /* This is called when the method is belived to have failed, probably because
 460    read returned -1. */
 461 bool pkgAcquire::Worker::MethodFailure()
 462 {
 463    cerr << "Method " << Access << " has died unexpectedly!" << endl;
 464    if (waitpid(Process,0,0) != Process)
 465       _error->Warning("I waited but nothing was there!");
 466    Process = -1;
 467    close(InFd);
 468    close(OutFd);
 469    InFd = -1;
 470    OutFd = -1;
 471    OutReady = false;
 472    InReady = false;
 473    OutQueue = string();
 474    MessageQueue.erase(MessageQueue.begin(),MessageQueue.end());
 475
 476    return false;
 477 }
 478                                                                         /*}}}*/
 479 // Worker::Pulse - Called periodically                                  /*{{{*/
 480 // ---------------------------------------------------------------------
 481 /* */
 482 void pkgAcquire::Worker::Pulse()
 483 {
 484    if (CurrentItem == 0)
 485       return;
 486
 487    struct stat Buf;
 488    if (stat(CurrentItem->Owner->DestFile.c_str(),&Buf) != 0)
 489       return;
 490    CurrentSize = Buf.st_size;
 491 }
 492                                                                         /*}}}*/
 493 // Worker::ItemDone - Called when the current item is finished          /*{{{*/
 494 // ---------------------------------------------------------------------
 495 /* */
 496 void pkgAcquire::Worker::ItemDone()
 497 {
 498    CurrentItem = 0;
 499    CurrentSize = 0;
 500    TotalSize = 0;
 501    Status = string();
 502 }
 503                                                                         /*}}}*/