[apt.git] / apt-pkg / acquire-worker.cc

// -*- mode: cpp; mode: fold -*-
// Description								/*{{{*/
// $Id: acquire-worker.cc,v 1.34 2001/05/22 04:42:54 jgg Exp $
/* ######################################################################

   Acquire Worker 

   The worker process can startup either as a Configuration prober
   or as a queue runner. As a configuration prober it only reads the
   configuration message and 
   
   ##################################################################### */
									/*}}}*/
// Include Files							/*{{{*/
#include <apt-pkg/acquire-worker.h>
#include <apt-pkg/acquire-item.h>
#include <apt-pkg/configuration.h>
#include <apt-pkg/error.h>
#include <apt-pkg/fileutl.h>
#include <apt-pkg/strutl.h>

#include <apti18n.h>

#include <iostream>
#include <sstream>
#include <fstream>
    
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
#include <signal.h>
#include <stdio.h>
#include <errno.h>
									/*}}}*/

using namespace std;

// Worker::Worker - Constructor for Queue startup			/*{{{*/
// ---------------------------------------------------------------------
/* */
pkgAcquire::Worker::Worker(Queue *Q,MethodConfig *Cnf,
			   pkgAcquireStatus *Log) : Log(Log)
{
   OwnerQ = Q;
   Config = Cnf;
   Access = Cnf->Access;
   CurrentItem = 0;
   TotalSize = 0;
   CurrentSize = 0;
   
   Construct();   
}
									/*}}}*/
// Worker::Worker - Constructor for method config startup		/*{{{*/
// ---------------------------------------------------------------------
/* */
pkgAcquire::Worker::Worker(MethodConfig *Cnf)
{
   OwnerQ = 0;
   Config = Cnf;
   Access = Cnf->Access;
   CurrentItem = 0;
   TotalSize = 0;
   CurrentSize = 0;
   
   Construct();   
}
									/*}}}*/
// Worker::Construct - Constructor helper				/*{{{*/
// ---------------------------------------------------------------------
/* */
void pkgAcquire::Worker::Construct()
{
   NextQueue = 0;
   NextAcquire = 0;
   Process = -1;
   InFd = -1;
   OutFd = -1;
   OutReady = false;
   InReady = false;
   Debug = _config->FindB("Debug::pkgAcquire::Worker",false);
}
									/*}}}*/
// Worker::~Worker - Destructor						/*{{{*/
// ---------------------------------------------------------------------
/* */
pkgAcquire::Worker::~Worker()
{
   close(InFd);
   close(OutFd);
   
   if (Process > 0)
   {
      /* Closing of stdin is the signal to exit and die when the process
         indicates it needs cleanup */
      if (Config->NeedsCleanup == false)
	 kill(Process,SIGINT);
      ExecWait(Process,Access.c_str(),true);
   }   
}
									/*}}}*/
// Worker::Start - Start the worker process				/*{{{*/
// ---------------------------------------------------------------------
/* This forks the method and inits the communication channel */
bool pkgAcquire::Worker::Start()
{
   // Get the method path
   string Method = _config->FindDir("Dir::Bin::Methods") + Access;
   if (FileExists(Method) == false)
      return _error->Error(_("The method driver %s could not be found."),Method.c_str());

   if (Debug == true)
      clog << "Starting method '" << Method << '\'' << endl;

   // Create the pipes
   int Pipes[4] = {-1,-1,-1,-1};
   if (pipe(Pipes) != 0 || pipe(Pipes+2) != 0)
   {
      _error->Errno("pipe","Failed to create IPC pipe to subprocess");
      for (int I = 0; I != 4; I++)
	 close(Pipes[I]);
      return false;
   }
   for (int I = 0; I != 4; I++)
      SetCloseExec(Pipes[I],true);
   
   // Fork off the process
   Process = ExecFork();
   if (Process == 0)
   {
      // Setup the FDs
      dup2(Pipes[1],STDOUT_FILENO);
      dup2(Pipes[2],STDIN_FILENO);
      SetCloseExec(STDOUT_FILENO,false);
      SetCloseExec(STDIN_FILENO,false);      
      SetCloseExec(STDERR_FILENO,false);
      
      const char *Args[2];
      Args[0] = Method.c_str();
      Args[1] = 0;
      execv(Args[0],(char **)Args);
      cerr << "Failed to exec method " << Args[0] << endl;
      _exit(100);
   }

   // Fix up our FDs
   InFd = Pipes[0];
   OutFd = Pipes[3];
   SetNonBlock(Pipes[0],true);
   SetNonBlock(Pipes[3],true);
   close(Pipes[1]);
   close(Pipes[2]);
   OutReady = false;
   InReady = true;
   
   // Read the configuration data
   if (WaitFd(InFd) == false ||
       ReadMessages() == false)
      return _error->Error(_("Method %s did not start correctly"),Method.c_str());

   RunMessages();
   if (OwnerQ != 0)
      SendConfiguration();
   
   return true;
}
									/*}}}*/
// Worker::ReadMessages - Read all pending messages into the list	/*{{{*/
// ---------------------------------------------------------------------
/* */
bool pkgAcquire::Worker::ReadMessages()
{
   if (::ReadMessages(InFd,MessageQueue) == false)
      return MethodFailure();
   return true;
}
									/*}}}*/
// Worker::RunMessage - Empty the message queue				/*{{{*/
// ---------------------------------------------------------------------
/* This takes the messages from the message queue and runs them through
   the parsers in order. */
bool pkgAcquire::Worker::RunMessages()
{
   while (MessageQueue.empty() == false)
   {
      string Message = MessageQueue.front();
      MessageQueue.erase(MessageQueue.begin());

      if (Debug == true)
	 clog << " <- " << Access << ':' << QuoteString(Message,"\n") << endl;
      
      // Fetch the message number
      char *End;
      int Number = strtol(Message.c_str(),&End,10);
      if (End == Message.c_str())
	 return _error->Error("Invalid message from method %s: %s",Access.c_str(),Message.c_str());

      string URI = LookupTag(Message,"URI");
      pkgAcquire::Queue::QItem *Itm = 0;
      if (URI.empty() == false)
	 Itm = OwnerQ->FindItem(URI,this);
      
      // Determine the message number and dispatch
      switch (Number)
      {
	 // 100 Capabilities
	 case 100:
	 if (Capabilities(Message) == false)
	    return _error->Error("Unable to process Capabilities message from %s",Access.c_str());
	 break;
	 
	 // 101 Log
	 case 101:
	 if (Debug == true)
	    clog << " <- (log) " << LookupTag(Message,"Message") << endl;
	 break;
	 
	 // 102 Status
	 case 102:
	 Status = LookupTag(Message,"Message");
	 break;
	    
	 // 200 URI Start
	 case 200:
	 {
	    if (Itm == 0)
	    {
	       _error->Error("Method gave invalid 200 URI Start message");
	       break;
	    }
	    
	    CurrentItem = Itm;
	    CurrentSize = 0;
	    TotalSize = atoi(LookupTag(Message,"Size","0").c_str());
	    ResumePoint = atoi(LookupTag(Message,"Resume-Point","0").c_str());
	    Itm->Owner->Start(Message,atoi(LookupTag(Message,"Size","0").c_str()));

	    // Display update before completion
	    if (Log != 0 && Log->MorePulses == true)
	       Log->Pulse(Itm->Owner->GetOwner());
	    
	    if (Log != 0)
	       Log->Fetch(*Itm);

	    break;
	 }
	 
	 // 201 URI Done
	 case 201:
	 {
	    if (Itm == 0)
	    {
	       _error->Error("Method gave invalid 201 URI Done message");
	       break;
	    }
	    
	    pkgAcquire::Item *Owner = Itm->Owner;
	    pkgAcquire::ItemDesc Desc = *Itm;
	    
	    // Display update before completion
	    if (Log != 0 && Log->MorePulses == true)
	       Log->Pulse(Owner->GetOwner());
	    
	    OwnerQ->ItemDone(Itm);
	    if (TotalSize != 0 &&
		(unsigned)atoi(LookupTag(Message,"Size","0").c_str()) != TotalSize)
	       _error->Warning("Bizarre Error - File size is not what the server reported %s %lu",
			       LookupTag(Message,"Size","0").c_str(),TotalSize);

	    Owner->Done(Message,atoi(LookupTag(Message,"Size","0").c_str()),
			LookupTag(Message,"MD5-Hash"),Config);
	    ItemDone();
	    
	    // Log that we are done
	    if (Log != 0)
	    {
	       if (StringToBool(LookupTag(Message,"IMS-Hit"),false) == true ||
		   StringToBool(LookupTag(Message,"Alt-IMS-Hit"),false) == true)
	       {
		  /* Hide 'hits' for local only sources - we also manage to
		     hide gets */
		  if (Config->LocalOnly == false)
		     Log->IMSHit(Desc);
	       }	       
	       else
		  Log->Done(Desc);
	    }
	    break;
	 }	 
	 
	 // 400 URI Failure
	 case 400:
	 {
	    if (Itm == 0)
	    {
	       _error->Error("Method gave invalid 400 URI Failure message");
	       break;
	    }

	    // Display update before completion
	    if (Log != 0 && Log->MorePulses == true)
	       Log->Pulse(Itm->Owner->GetOwner());
	    
	    pkgAcquire::Item *Owner = Itm->Owner;
	    pkgAcquire::ItemDesc Desc = *Itm;
	    OwnerQ->ItemDone(Itm);
	    Owner->Failed(Message,Config);
	    ItemDone();

	    if (Log != 0)
	       Log->Fail(Desc);

	    break;
	 }	 
	 
	 // 401 General Failure
	 case 401:
	 _error->Error("Method %s General failure: %s",Access.c_str(),LookupTag(Message,"Message").c_str());
	 break;
	 
	 // 403 Media Change
	 case 403:
	 MediaChange(Message); 
	 break;
      }      
   }
   return true;
}
									/*}}}*/
// Worker::Capabilities - 100 Capabilities handler			/*{{{*/
// ---------------------------------------------------------------------
/* This parses the capabilities message and dumps it into the configuration
   structure. */
bool pkgAcquire::Worker::Capabilities(string Message)
{
   if (Config == 0)
      return true;
   
   Config->Version = LookupTag(Message,"Version");
   Config->SingleInstance = StringToBool(LookupTag(Message,"Single-Instance"),false);
   Config->Pipeline = StringToBool(LookupTag(Message,"Pipeline"),false);
   Config->SendConfig = StringToBool(LookupTag(Message,"Send-Config"),false);
   Config->LocalOnly = StringToBool(LookupTag(Message,"Local-Only"),false);
   Config->NeedsCleanup = StringToBool(LookupTag(Message,"Needs-Cleanup"),false);
   Config->Removable = StringToBool(LookupTag(Message,"Removable"),false);

   // Some debug text
   if (Debug == true)
   {
      clog << "Configured access method " << Config->Access << endl;
      clog << "Version:" << Config->Version <<
	      " SingleInstance:" << Config->SingleInstance <<
	      " Pipeline:" << Config->Pipeline << 
	      " SendConfig:" << Config->SendConfig << 
	      " LocalOnly: " << Config->LocalOnly << 
	      " NeedsCleanup: " << Config->NeedsCleanup << 
	      " Removable: " << Config->Removable << endl;
   }
   
   return true;
}
									/*}}}*/
// Worker::MediaChange - Request a media change				/*{{{*/
// ---------------------------------------------------------------------
/* */
bool pkgAcquire::Worker::MediaChange(string Message)
{
   int status_fd = _config->FindI("APT::Status-Fd",-1);
   if(status_fd > 0) 
   {
      string Media = LookupTag(Message,"Media");
      string Drive = LookupTag(Message,"Drive"); 
      ostringstream msg,status;
      ioprintf(msg,_("Please insert the disc labeled: "
		     "'%s' "
		     "in the drive '%s' and press enter."),
	       Media.c_str(),Drive.c_str());
      status << "media-change: "  // message
	     << Media  << ":"     // media
	     << Drive  << ":"     // drive
	     << msg.str()         // l10n message
	     << endl;
      write(status_fd, status.str().c_str(), status.str().size());
   }

   if (Log == 0 || Log->MediaChange(LookupTag(Message,"Media"),
				    LookupTag(Message,"Drive")) == false)
   {
      char S[300];
      snprintf(S,sizeof(S),"603 Media Changed\nFailed: true\n\n");
      if (Debug == true)
	 clog << " -> " << Access << ':' << QuoteString(S,"\n") << endl;
      OutQueue += S;
      OutReady = true;
      return true;
   }

   char S[300];
   snprintf(S,sizeof(S),"603 Media Changed\n\n");
   if (Debug == true)
      clog << " -> " << Access << ':' << QuoteString(S,"\n") << endl;
   OutQueue += S;
   OutReady = true;
   return true;
}
									/*}}}*/
// Worker::SendConfiguration - Send the config to the method		/*{{{*/
// ---------------------------------------------------------------------
/* */
bool pkgAcquire::Worker::SendConfiguration()
{
   if (Config->SendConfig == false)
      return true;

   if (OutFd == -1)
      return false;
   
   string Message = "601 Configuration\n";
   Message.reserve(2000);

   /* Write out all of the configuration directives by walking the 
      configuration tree */
   const Configuration::Item *Top = _config->Tree(0);
   for (; Top != 0;)
   {
      if (Top->Value.empty() == false)
      {
	 string Line = "Config-Item: " + QuoteString(Top->FullTag(),"=\"\n") + "=";
	 Line += QuoteString(Top->Value,"\n") + '\n';
	 Message += Line;
      }
      
      if (Top->Child != 0)
      {
	 Top = Top->Child;
	 continue;
      }
      
      while (Top != 0 && Top->Next == 0)
	 Top = Top->Parent;
      if (Top != 0)
	 Top = Top->Next;
   }   
   Message += '\n';

   if (Debug == true)
      clog << " -> " << Access << ':' << QuoteString(Message,"\n") << endl;
   OutQueue += Message;
   OutReady = true; 
   
   return true;
}
									/*}}}*/
// Worker::QueueItem - Add an item to the outbound queue		/*{{{*/
// ---------------------------------------------------------------------
/* Send a URI Acquire message to the method */
bool pkgAcquire::Worker::QueueItem(pkgAcquire::Queue::QItem *Item)
{
   if (OutFd == -1)
      return false;
   
   string Message = "600 URI Acquire\n";
   Message.reserve(300);
   Message += "URI: " + Item->URI;
   Message += "\nFilename: " + Item->Owner->DestFile;
   Message += Item->Owner->Custom600Headers();
   Message += "\n\n";
   
   if (Debug == true)
      clog << " -> " << Access << ':' << QuoteString(Message,"\n") << endl;
   OutQueue += Message;
   OutReady = true;
   
   return true;
}
									/*}}}*/
// Worker::OutFdRead - Out bound FD is ready				/*{{{*/
// ---------------------------------------------------------------------
/* */
bool pkgAcquire::Worker::OutFdReady()
{
   int Res;
   do
   {
      Res = write(OutFd,OutQueue.c_str(),OutQueue.length());
   }
   while (Res < 0 && errno == EINTR);
   
   if (Res <= 0)
      return MethodFailure();

   // Hmm.. this should never happen.
   if (Res < 0)
      return true;
   
   OutQueue.erase(0,Res);
   if (OutQueue.empty() == true)
      OutReady = false;
   
   return true;
}
									/*}}}*/
// Worker::InFdRead - In bound FD is ready				/*{{{*/
// ---------------------------------------------------------------------
/* */
bool pkgAcquire::Worker::InFdReady()
{
   if (ReadMessages() == false)
      return false;
   RunMessages();
   return true;
}
									/*}}}*/
// Worker::MethodFailure - Called when the method fails			/*{{{*/
// ---------------------------------------------------------------------
/* This is called when the method is belived to have failed, probably because
   read returned -1. */
bool pkgAcquire::Worker::MethodFailure()
{
   _error->Error("Method %s has died unexpectedly!",Access.c_str());
   
   ExecWait(Process,Access.c_str(),true);
   Process = -1;
   close(InFd);
   close(OutFd);
   InFd = -1;
   OutFd = -1;
   OutReady = false;
   InReady = false;
   OutQueue = string();
   MessageQueue.erase(MessageQueue.begin(),MessageQueue.end());
   
   return false;
}
									/*}}}*/
// Worker::Pulse - Called periodically 					/*{{{*/
// ---------------------------------------------------------------------
/* */
void pkgAcquire::Worker::Pulse()
{
   if (CurrentItem == 0)
      return;
 
   struct stat Buf;
   if (stat(CurrentItem->Owner->DestFile.c_str(),&Buf) != 0)
      return;
   CurrentSize = Buf.st_size;
   
   // Hmm? Should not happen...
   if (CurrentSize > TotalSize && TotalSize != 0)
      TotalSize = CurrentSize;
}
									/*}}}*/
// Worker::ItemDone - Called when the current item is finished		/*{{{*/
// ---------------------------------------------------------------------
/* */
void pkgAcquire::Worker::ItemDone()
{
   CurrentItem = 0;
   CurrentSize = 0;
   TotalSize = 0;
   Status = string();
}
									/*}}}*/
Commit	Line	Data
0118833a AL	1	// -- mode: cpp; mode: fold --
0118833a AL	2	// Description /{{{/
24a0d63a	3	// $Id: acquire-worker.cc,v 1.34 2001/05/22 04:42:54 jgg Exp $
0118833a AL	4	/* ######################################################################
	5
	6	Acquire Worker
	7
3b5421b4 AL	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
0118833a AL	12	##################################################################### */
	13	/}}}/
	14	// Include Files /{{{/
0118833a	15	#include <apt-pkg/acquire-worker.h>
0a8a80e5	16	#include <apt-pkg/acquire-item.h>
3b5421b4 AL	17	#include <apt-pkg/configuration.h>
	18	#include <apt-pkg/error.h>
	19	#include <apt-pkg/fileutl.h>
cdcc6d34	20	#include <apt-pkg/strutl.h>
3b5421b4	21
b2e465d6	22	#include <apti18n.h>
24a0d63a AL	23
24a0d63a AL	24	#include <iostream>
80a26ed1	25	#include <sstream>
24a0d63a	26	#include <fstream>
b2e465d6	27
8267fe24	28	#include <sys/stat.h>
3b5421b4	29	#include <unistd.h>
b0db36b1	30	#include <fcntl.h>
3b5421b4	31	#include <signal.h>
542ec555	32	#include <stdio.h>
b0db36b1	33	#include <errno.h>
3b5421b4 AL	34	/}}}/
3b5421b4 AL	35
24a0d63a AL	36	using namespace std;
24a0d63a AL	37
3b5421b4 AL	38	// Worker::Worker - Constructor for Queue startup /{{{/
	39	// ---------------------------------------------------------------------
	40	/* */
8267fe24 AL	41	pkgAcquire::Worker::Worker(Queue Q,MethodConfig Cnf,
8267fe24 AL	42	pkgAcquireStatus *Log) : Log(Log)
3b5421b4 AL	43	{
3b5421b4 AL	44	OwnerQ = Q;
0a8a80e5 AL	45	Config = Cnf;
	46	Access = Cnf->Access;
	47	CurrentItem = 0;
18ef0a78 AL	48	TotalSize = 0;
	49	CurrentSize = 0;
	50
3b5421b4 AL	51	Construct();
	52	}
	53	/}}}/
	54	// Worker::Worker - Constructor for method config startup /{{{/
	55	// ---------------------------------------------------------------------
	56	/* */
	57	pkgAcquire::Worker::Worker(MethodConfig *Cnf)
	58	{
	59	OwnerQ = 0;
	60	Config = Cnf;
	61	Access = Cnf->Access;
0a8a80e5	62	CurrentItem = 0;
18ef0a78 AL	63	TotalSize = 0;
18ef0a78 AL	64	CurrentSize = 0;
0a8a80e5	65
3b5421b4 AL	66	Construct();
	67	}
	68	/}}}/
	69	// Worker::Construct - Constructor helper /{{{/
	70	// ---------------------------------------------------------------------
	71	/* */
	72	void pkgAcquire::Worker::Construct()
	73	{
0a8a80e5 AL	74	NextQueue = 0;
0a8a80e5 AL	75	NextAcquire = 0;
3b5421b4 AL	76	Process = -1;
	77	InFd = -1;
	78	OutFd = -1;
0a8a80e5 AL	79	OutReady = false;
0a8a80e5 AL	80	InReady = false;
3b5421b4 AL	81	Debug = _config->FindB("Debug::pkgAcquire::Worker",false);
	82	}
	83	/}}}/
	84	// Worker::~Worker - Destructor /{{{/
	85	// ---------------------------------------------------------------------
	86	/* */
	87	pkgAcquire::Worker::~Worker()
	88	{
	89	close(InFd);
	90	close(OutFd);
	91
	92	if (Process > 0)
0a8a80e5	93	{
8e5fc8f5 AL	94	/* Closing of stdin is the signal to exit and die when the process
	95	indicates it needs cleanup */
	96	if (Config->NeedsCleanup == false)
	97	kill(Process,SIGINT);
ddc1d8d0	98	ExecWait(Process,Access.c_str(),true);
0a8a80e5	99	}
3b5421b4 AL	100	}
	101	/}}}/
	102	// Worker::Start - Start the worker process /{{{/
	103	// ---------------------------------------------------------------------
	104	/* This forks the method and inits the communication channel */
	105	bool pkgAcquire::Worker::Start()
	106	{
	107	// Get the method path
	108	string Method = _config->FindDir("Dir::Bin::Methods") + Access;
	109	if (FileExists(Method) == false)
b2e465d6	110	return _error->Error(_("The method driver %s could not be found."),Method.c_str());
3b5421b4 AL	111
	112	if (Debug == true)
	113	clog << "Starting method '" << Method << '\'' << endl;
	114
	115	// Create the pipes
	116	int Pipes[4] = {-1,-1,-1,-1};
	117	if (pipe(Pipes) != 0 \|\| pipe(Pipes+2) != 0)
	118	{
	119	_error->Errno("pipe","Failed to create IPC pipe to subprocess");
	120	for (int I = 0; I != 4; I++)
	121	close(Pipes[I]);
	122	return false;
	123	}
8b89e57f	124	for (int I = 0; I != 4; I++)
4490f2de	125	SetCloseExec(Pipes[I],true);
8b89e57f	126
3b5421b4	127	// Fork off the process
54676e1a	128	Process = ExecFork();
3b5421b4 AL	129	if (Process == 0)
	130	{
	131	// Setup the FDs
	132	dup2(Pipes[1],STDOUT_FILENO);
	133	dup2(Pipes[2],STDIN_FILENO);
3b5421b4 AL	134	SetCloseExec(STDOUT_FILENO,false);
	135	SetCloseExec(STDIN_FILENO,false);
	136	SetCloseExec(STDERR_FILENO,false);
	137
	138	const char *Args[2];
	139	Args[0] = Method.c_str();
	140	Args[1] = 0;
	141	execv(Args[0],(char **)Args);
	142	cerr << "Failed to exec method " << Args[0] << endl;
0dbb95d8	143	_exit(100);
3b5421b4 AL	144	}
	145
	146	// Fix up our FDs
	147	InFd = Pipes[0];
	148	OutFd = Pipes[3];
	149	SetNonBlock(Pipes[0],true);
	150	SetNonBlock(Pipes[3],true);
	151	close(Pipes[1]);
	152	close(Pipes[2]);
0a8a80e5 AL	153	OutReady = false;
0a8a80e5 AL	154	InReady = true;
3b5421b4 AL	155
	156	// Read the configuration data
	157	if (WaitFd(InFd) == false \|\|
	158	ReadMessages() == false)
b2e465d6	159	return _error->Error(_("Method %s did not start correctly"),Method.c_str());
3b5421b4 AL	160
3b5421b4 AL	161	RunMessages();
8b89e57f AL	162	if (OwnerQ != 0)
8b89e57f AL	163	SendConfiguration();
3b5421b4 AL	164
	165	return true;
	166	}
	167	/}}}/
	168	// Worker::ReadMessages - Read all pending messages into the list /{{{/
	169	// ---------------------------------------------------------------------
0a8a80e5	170	/* */
3b5421b4 AL	171	bool pkgAcquire::Worker::ReadMessages()
3b5421b4 AL	172	{
0a8a80e5 AL	173	if (::ReadMessages(InFd,MessageQueue) == false)
0a8a80e5 AL	174	return MethodFailure();
3b5421b4 AL	175	return true;
	176	}
	177	/}}}/
3b5421b4 AL	178	// Worker::RunMessage - Empty the message queue /{{{/
	179	// ---------------------------------------------------------------------
	180	/* This takes the messages from the message queue and runs them through
	181	the parsers in order. */
	182	bool pkgAcquire::Worker::RunMessages()
	183	{
	184	while (MessageQueue.empty() == false)
	185	{
	186	string Message = MessageQueue.front();
	187	MessageQueue.erase(MessageQueue.begin());
0a8a80e5 AL	188
	189	if (Debug == true)
	190	clog << " <- " << Access << ':' << QuoteString(Message,"\n") << endl;
3b5421b4 AL	191
	192	// Fetch the message number
	193	char *End;
	194	int Number = strtol(Message.c_str(),&End,10);
	195	if (End == Message.c_str())
	196	return _error->Error("Invalid message from method %s: %s",Access.c_str(),Message.c_str());
	197
c88edf1d AL	198	string URI = LookupTag(Message,"URI");
	199	pkgAcquire::Queue::QItem *Itm = 0;
	200	if (URI.empty() == false)
	201	Itm = OwnerQ->FindItem(URI,this);
bfd22fc0	202
3b5421b4 AL	203	// Determine the message number and dispatch
	204	switch (Number)
	205	{
0a8a80e5	206	// 100 Capabilities
3b5421b4 AL	207	case 100:
	208	if (Capabilities(Message) == false)
	209	return _error->Error("Unable to process Capabilities message from %s",Access.c_str());
	210	break;
0a8a80e5 AL	211
	212	// 101 Log
	213	case 101:
	214	if (Debug == true)
	215	clog << " <- (log) " << LookupTag(Message,"Message") << endl;
	216	break;
	217
	218	// 102 Status
	219	case 102:
	220	Status = LookupTag(Message,"Message");
	221	break;
	222
	223	// 200 URI Start
	224	case 200:
c88edf1d AL	225	{
	226	if (Itm == 0)
	227	{
93bf083d	228	_error->Error("Method gave invalid 200 URI Start message");
c88edf1d AL	229	break;
c88edf1d AL	230	}
8267fe24	231
c88edf1d AL	232	CurrentItem = Itm;
	233	CurrentSize = 0;
	234	TotalSize = atoi(LookupTag(Message,"Size","0").c_str());
8b75eb1c	235	ResumePoint = atoi(LookupTag(Message,"Resume-Point","0").c_str());
8267fe24	236	Itm->Owner->Start(Message,atoi(LookupTag(Message,"Size","0").c_str()));
8b75eb1c	237
c5ccf175 AL	238	// Display update before completion
	239	if (Log != 0 && Log->MorePulses == true)
	240	Log->Pulse(Itm->Owner->GetOwner());
	241
8267fe24 AL	242	if (Log != 0)
	243	Log->Fetch(*Itm);
	244
c88edf1d AL	245	break;
c88edf1d AL	246	}
0a8a80e5 AL	247
	248	// 201 URI Done
	249	case 201:
c88edf1d AL	250	{
	251	if (Itm == 0)
	252	{
93bf083d	253	_error->Error("Method gave invalid 201 URI Done message");
c88edf1d AL	254	break;
c88edf1d AL	255	}
c5ccf175	256
bfd22fc0	257	pkgAcquire::Item *Owner = Itm->Owner;
8267fe24	258	pkgAcquire::ItemDesc Desc = *Itm;
c5ccf175 AL	259
	260	// Display update before completion
	261	if (Log != 0 && Log->MorePulses == true)
	262	Log->Pulse(Owner->GetOwner());
	263
be4401bf	264	OwnerQ->ItemDone(Itm);
b2e465d6	265	if (TotalSize != 0 &&
bf3abeed	266	(unsigned)atoi(LookupTag(Message,"Size","0").c_str()) != TotalSize)
b2e465d6	267	_error->Warning("Bizarre Error - File size is not what the server reported %s %lu",
18ef0a78	268	LookupTag(Message,"Size","0").c_str(),TotalSize);
bdae53f1 AL	269
bdae53f1 AL	270	Owner->Done(Message,atoi(LookupTag(Message,"Size","0").c_str()),
459681d3	271	LookupTag(Message,"MD5-Hash"),Config);
8267fe24 AL	272	ItemDone();
	273
	274	// Log that we are done
	275	if (Log != 0)
	276	{
	277	if (StringToBool(LookupTag(Message,"IMS-Hit"),false) == true \|\|
	278	StringToBool(LookupTag(Message,"Alt-IMS-Hit"),false) == true)
c46824ce AL	279	{
	280	/* Hide 'hits' for local only sources - we also manage to
	281	hide gets */
	282	if (Config->LocalOnly == false)
	283	Log->IMSHit(Desc);
	284	}
8267fe24 AL	285	else
8267fe24 AL	286	Log->Done(Desc);
18ef0a78	287	}
c88edf1d AL	288	break;
c88edf1d AL	289	}
0a8a80e5 AL	290
	291	// 400 URI Failure
	292	case 400:
c88edf1d AL	293	{
	294	if (Itm == 0)
	295	{
93bf083d	296	_error->Error("Method gave invalid 400 URI Failure message");
c88edf1d AL	297	break;
	298	}
	299
c5ccf175 AL	300	// Display update before completion
	301	if (Log != 0 && Log->MorePulses == true)
	302	Log->Pulse(Itm->Owner->GetOwner());
	303
bfd22fc0	304	pkgAcquire::Item *Owner = Itm->Owner;
8267fe24	305	pkgAcquire::ItemDesc Desc = *Itm;
c88edf1d	306	OwnerQ->ItemDone(Itm);
7d8afa39	307	Owner->Failed(Message,Config);
8267fe24	308	ItemDone();
7d8afa39	309
8267fe24 AL	310	if (Log != 0)
8267fe24 AL	311	Log->Fail(Desc);
7d8afa39	312
c88edf1d AL	313	break;
c88edf1d AL	314	}
0a8a80e5 AL	315
	316	// 401 General Failure
	317	case 401:
b2e465d6	318	_error->Error("Method %s General failure: %s",Access.c_str(),LookupTag(Message,"Message").c_str());
0a8a80e5	319	break;
542ec555 AL	320
	321	// 403 Media Change
	322	case 403:
	323	MediaChange(Message);
	324	break;
3b5421b4 AL	325	}
	326	}
	327	return true;
	328	}
	329	/}}}/
	330	// Worker::Capabilities - 100 Capabilities handler /{{{/
	331	// ---------------------------------------------------------------------
	332	/* This parses the capabilities message and dumps it into the configuration
	333	structure. */
	334	bool pkgAcquire::Worker::Capabilities(string Message)
	335	{
	336	if (Config == 0)
	337	return true;
	338
	339	Config->Version = LookupTag(Message,"Version");
	340	Config->SingleInstance = StringToBool(LookupTag(Message,"Single-Instance"),false);
0a8a80e5 AL	341	Config->Pipeline = StringToBool(LookupTag(Message,"Pipeline"),false);
0a8a80e5 AL	342	Config->SendConfig = StringToBool(LookupTag(Message,"Send-Config"),false);
e331f6ed	343	Config->LocalOnly = StringToBool(LookupTag(Message,"Local-Only"),false);
8e5fc8f5	344	Config->NeedsCleanup = StringToBool(LookupTag(Message,"Needs-Cleanup"),false);
459681d3	345	Config->Removable = StringToBool(LookupTag(Message,"Removable"),false);
3b5421b4 AL	346
	347	// Some debug text
	348	if (Debug == true)
	349	{
	350	clog << "Configured access method " << Config->Access << endl;
459681d3 AL	351	clog << "Version:" << Config->Version <<
	352	" SingleInstance:" << Config->SingleInstance <<
	353	" Pipeline:" << Config->Pipeline <<
	354	" SendConfig:" << Config->SendConfig <<
	355	" LocalOnly: " << Config->LocalOnly <<
	356	" NeedsCleanup: " << Config->NeedsCleanup <<
	357	" Removable: " << Config->Removable << endl;
3b5421b4 AL	358	}
3b5421b4 AL	359
542ec555 AL	360	return true;
	361	}
	362	/}}}/
	363	// Worker::MediaChange - Request a media change /{{{/
	364	// ---------------------------------------------------------------------
	365	/* */
	366	bool pkgAcquire::Worker::MediaChange(string Message)
	367	{
80a26ed1 MV	368	int status_fd = _config->FindI("APT::Status-Fd",-1);
	369	if(status_fd > 0)
	370	{
	371	string Media = LookupTag(Message,"Media");
	372	string Drive = LookupTag(Message,"Drive");
	373	ostringstream msg,status;
1a82c63e MV	374	ioprintf(msg,_("Please insert the disc labeled: "
	375	"'%s' "
	376	"in the drive '%s' and press enter."),
	377	Media.c_str(),Drive.c_str());
80a26ed1	378	status << "media-change: " // message
1a82c63e MV	379	<< Media << ":" // media
	380	<< Drive << ":" // drive
	381	<< msg.str() // l10n message
80a26ed1 MV	382	<< endl;
	383	write(status_fd, status.str().c_str(), status.str().size());
	384	}
	385
542ec555 AL	386	if (Log == 0 \|\| Log->MediaChange(LookupTag(Message,"Media"),
	387	LookupTag(Message,"Drive")) == false)
	388	{
	389	char S[300];
96bc43c4	390	snprintf(S,sizeof(S),"603 Media Changed\nFailed: true\n\n");
542ec555 AL	391	if (Debug == true)
	392	clog << " -> " << Access << ':' << QuoteString(S,"\n") << endl;
	393	OutQueue += S;
	394	OutReady = true;
	395	return true;
	396	}
	397
	398	char S[300];
96bc43c4	399	snprintf(S,sizeof(S),"603 Media Changed\n\n");
542ec555 AL	400	if (Debug == true)
	401	clog << " -> " << Access << ':' << QuoteString(S,"\n") << endl;
	402	OutQueue += S;
	403	OutReady = true;
3b5421b4 AL	404	return true;
3b5421b4 AL	405	}
0118833a	406	/}}}/
0a8a80e5 AL	407	// Worker::SendConfiguration - Send the config to the method /{{{/
	408	// ---------------------------------------------------------------------
	409	/* */
	410	bool pkgAcquire::Worker::SendConfiguration()
	411	{
	412	if (Config->SendConfig == false)
	413	return true;
	414
	415	if (OutFd == -1)
	416	return false;
	417
	418	string Message = "601 Configuration\n";
	419	Message.reserve(2000);
	420
	421	/* Write out all of the configuration directives by walking the
	422	configuration tree */
	423	const Configuration::Item *Top = _config->Tree(0);
	424	for (; Top != 0;)
	425	{
	426	if (Top->Value.empty() == false)
	427	{
b2e465d6	428	string Line = "Config-Item: " + QuoteString(Top->FullTag(),"=\"\n") + "=";
0a8a80e5 AL	429	Line += QuoteString(Top->Value,"\n") + '\n';
	430	Message += Line;
	431	}
	432
	433	if (Top->Child != 0)
	434	{
	435	Top = Top->Child;
	436	continue;
	437	}
	438
	439	while (Top != 0 && Top->Next == 0)
	440	Top = Top->Parent;
	441	if (Top != 0)
	442	Top = Top->Next;
	443	}
	444	Message += '\n';
	445
	446	if (Debug == true)
	447	clog << " -> " << Access << ':' << QuoteString(Message,"\n") << endl;
	448	OutQueue += Message;
	449	OutReady = true;
	450
	451	return true;
	452	}
	453	/}}}/
	454	// Worker::QueueItem - Add an item to the outbound queue /{{{/
	455	// ---------------------------------------------------------------------
	456	/* Send a URI Acquire message to the method */
	457	bool pkgAcquire::Worker::QueueItem(pkgAcquire::Queue::QItem *Item)
	458	{
	459	if (OutFd == -1)
	460	return false;
	461
	462	string Message = "600 URI Acquire\n";
	463	Message.reserve(300);
	464	Message += "URI: " + Item->URI;
	465	Message += "\nFilename: " + Item->Owner->DestFile;
	466	Message += Item->Owner->Custom600Headers();
	467	Message += "\n\n";
	468
	469	if (Debug == true)
	470	clog << " -> " << Access << ':' << QuoteString(Message,"\n") << endl;
	471	OutQueue += Message;
	472	OutReady = true;
	473
	474	return true;
	475	}
	476	/}}}/
	477	// Worker::OutFdRead - Out bound FD is ready /{{{/
	478	// ---------------------------------------------------------------------
	479	/* */
	480	bool pkgAcquire::Worker::OutFdReady()
	481	{
b0db36b1 AL	482	int Res;
	483	do
	484	{
24a0d63a	485	Res = write(OutFd,OutQueue.c_str(),OutQueue.length());
b0db36b1 AL	486	}
	487	while (Res < 0 && errno == EINTR);
	488
0a8a80e5 AL	489	if (Res <= 0)
	490	return MethodFailure();
	491
	492	// Hmm.. this should never happen.
	493	if (Res < 0)
	494	return true;
	495
	496	OutQueue.erase(0,Res);
	497	if (OutQueue.empty() == true)
	498	OutReady = false;
	499
	500	return true;
	501	}
	502	/}}}/
	503	// Worker::InFdRead - In bound FD is ready /{{{/
	504	// ---------------------------------------------------------------------
	505	/* */
	506	bool pkgAcquire::Worker::InFdReady()
	507	{
	508	if (ReadMessages() == false)
	509	return false;
	510	RunMessages();
	511	return true;
	512	}
	513	/}}}/
	514	// Worker::MethodFailure - Called when the method fails /{{{/
	515	// ---------------------------------------------------------------------
	516	/* This is called when the method is belived to have failed, probably because
	517	read returned -1. */
	518	bool pkgAcquire::Worker::MethodFailure()
	519	{
76d97c26 AL	520	_error->Error("Method %s has died unexpectedly!",Access.c_str());
76d97c26 AL	521
ddc1d8d0	522	ExecWait(Process,Access.c_str(),true);
0a8a80e5 AL	523	Process = -1;
	524	close(InFd);
	525	close(OutFd);
	526	InFd = -1;
	527	OutFd = -1;
	528	OutReady = false;
	529	InReady = false;
	530	OutQueue = string();
	531	MessageQueue.erase(MessageQueue.begin(),MessageQueue.end());
	532
	533	return false;
	534	}
	535	/}}}/
8267fe24 AL	536	// Worker::Pulse - Called periodically /{{{/
	537	// ---------------------------------------------------------------------
	538	/* */
	539	void pkgAcquire::Worker::Pulse()
	540	{
	541	if (CurrentItem == 0)
	542	return;
542ec555	543
8267fe24 AL	544	struct stat Buf;
	545	if (stat(CurrentItem->Owner->DestFile.c_str(),&Buf) != 0)
	546	return;
	547	CurrentSize = Buf.st_size;
18ef0a78 AL	548
	549	// Hmm? Should not happen...
	550	if (CurrentSize > TotalSize && TotalSize != 0)
	551	TotalSize = CurrentSize;
8267fe24 AL	552	}
	553	/}}}/
	554	// Worker::ItemDone - Called when the current item is finished /{{{/
	555	// ---------------------------------------------------------------------
	556	/* */
	557	void pkgAcquire::Worker::ItemDone()
	558	{
	559	CurrentItem = 0;
	560	CurrentSize = 0;
	561	TotalSize = 0;
	562	Status = string();
	563	}
	564	/}}}/