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

// -*- mode: cpp; mode: fold -*-
// Description								/*{{{*/
// $Id: acquire-worker.cc,v 1.10 1998/11/05 07:21:39 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							/*{{{*/
#ifdef __GNUG__
#pragma implementation "apt-pkg/acquire-worker.h"
#endif
#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 <strutl.h>

#include <unistd.h>
#include <signal.h>
#include <wait.h>
									/*}}}*/

// Worker::Worker - Constructor for Queue startup			/*{{{*/
// ---------------------------------------------------------------------
/* */
pkgAcquire::Worker::Worker(Queue *Q,MethodConfig *Cnf)
{
   OwnerQ = Q;
   Config = Cnf;
   Access = Cnf->Access;
   CurrentItem = 0;

   Construct();   
}
									/*}}}*/
// Worker::Worker - Constructor for method config startup		/*{{{*/
// ---------------------------------------------------------------------
/* */
pkgAcquire::Worker::Worker(MethodConfig *Cnf)
{
   OwnerQ = 0;
   Config = Cnf;
   Access = Cnf->Access;
   CurrentItem = 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)
   {
      kill(Process,SIGINT);
      if (waitpid(Process,0,0) != Process)
	 _error->Warning("I waited but nothing was there!");
   }   
}
									/*}}}*/
// 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[0],true);
   
   // Fork off the process
   Process = fork();
   if (Process < 0)
   {
      cerr << "FATAL -> Failed to fork." << endl;
      exit(100);
   }

   // Spawn the subprocess
   if (Process == 0)
   {
      // Setup the FDs
      dup2(Pipes[1],STDOUT_FILENO);
      dup2(Pipes[2],STDIN_FILENO);
      dup2(((filebuf *)clog.rdbuf())->fd(),STDERR_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());
	    
	    break;
	 }
	 
	 // 201 URI Done
	 case 201:
	 {
	    if (Itm == 0)
	    {
	       _error->Error("Method gave invalid 201 URI Done message");
	       break;
	    }

	    pkgAcquire::Item *Owner = Itm->Owner;
	    OwnerQ->ItemDone(Itm);
	    Owner->Done(Message,atoi(LookupTag(Message,"Size","0").c_str()),
					  LookupTag(Message,"MD5-Hash"));
	    break;
	 }	 
	 
	 // 400 URI Failure
	 case 400:
	 {
	    if (Itm == 0)
	    {
	       _error->Error("Method gave invalid 400 URI Failure message");
	       break;
	    }

	    pkgAcquire::Item *Owner = Itm->Owner;
	    OwnerQ->ItemDone(Itm);
	    Owner->Failed(Message);
	    break;
	 }	 
	 
	 // 401 General Failure
	 case 401:
	 _error->Error("Method %s General failure: %s",LookupTag(Message,"Message").c_str());
	 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->PreScan = StringToBool(LookupTag(Message,"Pre-Scan"),false);
   Config->Pipeline = StringToBool(LookupTag(Message,"Pipeline"),false);
   Config->SendConfig = StringToBool(LookupTag(Message,"Send-Config"),false);

   // Some debug text
   if (Debug == true)
   {
      clog << "Configured access method " << Config->Access << endl;
      clog << "Version:" << Config->Version << " SingleInstance:" <<
	 Config->SingleInstance << " PreScan: " << Config->PreScan <<
	 " Pipeline:" << Config->Pipeline << " SendConfig:" << 
	 Config->SendConfig << endl;
   }
   
   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: " + Top->FullTag() + "=";
	 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 = write(OutFd,OutQueue.begin(),OutQueue.length());
   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()
{
   cerr << "Method " << Access << " has died unexpectedly!" << endl;
   if (waitpid(Process,0,0) != Process)
      _error->Warning("I waited but nothing was there!");
   Process = -1;
   close(InFd);
   close(OutFd);
   InFd = -1;
   OutFd = -1;
   OutReady = false;
   InReady = false;
   OutQueue = string();
   MessageQueue.erase(MessageQueue.begin(),MessageQueue.end());
   
   return false;
}
									/*}}}*/
Commit	Line	Data
0118833a AL	1	// -- mode: cpp; mode: fold --
0118833a AL	2	// Description /{{{/
bfd22fc0	3	// $Id: acquire-worker.cc,v 1.10 1998/11/05 07:21:39 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 /{{{/
	15	#ifdef __GNUG__
	16	#pragma implementation "apt-pkg/acquire-worker.h"
3b5421b4	17	#endif
0118833a	18	#include <apt-pkg/acquire-worker.h>
0a8a80e5	19	#include <apt-pkg/acquire-item.h>
3b5421b4 AL	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 <unistd.h>
	26	#include <signal.h>
93641593	27	#include <wait.h>
3b5421b4 AL	28	/}}}/
	29
	30	// Worker::Worker - Constructor for Queue startup /{{{/
	31	// ---------------------------------------------------------------------
	32	/* */
0a8a80e5	33	pkgAcquire::Worker::Worker(Queue Q,MethodConfig Cnf)
3b5421b4 AL	34	{
3b5421b4 AL	35	OwnerQ = Q;
0a8a80e5 AL	36	Config = Cnf;
	37	Access = Cnf->Access;
	38	CurrentItem = 0;
3b5421b4 AL	39
	40	Construct();
	41	}
	42	/}}}/
	43	// Worker::Worker - Constructor for method config startup /{{{/
	44	// ---------------------------------------------------------------------
	45	/* */
	46	pkgAcquire::Worker::Worker(MethodConfig *Cnf)
	47	{
	48	OwnerQ = 0;
	49	Config = Cnf;
	50	Access = Cnf->Access;
0a8a80e5 AL	51	CurrentItem = 0;
0a8a80e5 AL	52
3b5421b4 AL	53	Construct();
	54	}
	55	/}}}/
	56	// Worker::Construct - Constructor helper /{{{/
	57	// ---------------------------------------------------------------------
	58	/* */
	59	void pkgAcquire::Worker::Construct()
	60	{
0a8a80e5 AL	61	NextQueue = 0;
0a8a80e5 AL	62	NextAcquire = 0;
3b5421b4 AL	63	Process = -1;
	64	InFd = -1;
	65	OutFd = -1;
0a8a80e5 AL	66	OutReady = false;
0a8a80e5 AL	67	InReady = false;
3b5421b4 AL	68	Debug = _config->FindB("Debug::pkgAcquire::Worker",false);
	69	}
	70	/}}}/
	71	// Worker::~Worker - Destructor /{{{/
	72	// ---------------------------------------------------------------------
	73	/* */
	74	pkgAcquire::Worker::~Worker()
	75	{
	76	close(InFd);
	77	close(OutFd);
	78
	79	if (Process > 0)
0a8a80e5	80	{
3b5421b4	81	kill(Process,SIGINT);
0a8a80e5 AL	82	if (waitpid(Process,0,0) != Process)
	83	_error->Warning("I waited but nothing was there!");
	84	}
3b5421b4 AL	85	}
	86	/}}}/
	87	// Worker::Start - Start the worker process /{{{/
	88	// ---------------------------------------------------------------------
	89	/* This forks the method and inits the communication channel */
	90	bool pkgAcquire::Worker::Start()
	91	{
	92	// Get the method path
	93	string Method = _config->FindDir("Dir::Bin::Methods") + Access;
	94	if (FileExists(Method) == false)
	95	return _error->Error("The method driver %s could not be found.",Method.c_str());
	96
	97	if (Debug == true)
	98	clog << "Starting method '" << Method << '\'' << endl;
	99
	100	// Create the pipes
	101	int Pipes[4] = {-1,-1,-1,-1};
	102	if (pipe(Pipes) != 0 \|\| pipe(Pipes+2) != 0)
	103	{
	104	_error->Errno("pipe","Failed to create IPC pipe to subprocess");
	105	for (int I = 0; I != 4; I++)
	106	close(Pipes[I]);
	107	return false;
	108	}
8b89e57f AL	109	for (int I = 0; I != 4; I++)
	110	SetCloseExec(Pipes[0],true);
	111
3b5421b4 AL	112	// Fork off the process
	113	Process = fork();
	114	if (Process < 0)
	115	{
	116	cerr << "FATAL -> Failed to fork." << endl;
	117	exit(100);
	118	}
	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);
3b5421b4 AL	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]);
0a8a80e5 AL	146	OutReady = false;
0a8a80e5 AL	147	InReady = true;
3b5421b4 AL	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();
8b89e57f AL	155	if (OwnerQ != 0)
8b89e57f AL	156	SendConfiguration();
3b5421b4 AL	157
	158	return true;
	159	}
	160	/}}}/
	161	// Worker::ReadMessages - Read all pending messages into the list /{{{/
	162	// ---------------------------------------------------------------------
0a8a80e5	163	/* */
3b5421b4 AL	164	bool pkgAcquire::Worker::ReadMessages()
3b5421b4 AL	165	{
0a8a80e5 AL	166	if (::ReadMessages(InFd,MessageQueue) == false)
0a8a80e5 AL	167	return MethodFailure();
3b5421b4 AL	168	return true;
	169	}
	170	/}}}/
3b5421b4 AL	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());
0a8a80e5 AL	181
	182	if (Debug == true)
	183	clog << " <- " << Access << ':' << QuoteString(Message,"\n") << endl;
3b5421b4 AL	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
c88edf1d AL	191	string URI = LookupTag(Message,"URI");
	192	pkgAcquire::Queue::QItem *Itm = 0;
	193	if (URI.empty() == false)
	194	Itm = OwnerQ->FindItem(URI,this);
bfd22fc0	195
3b5421b4 AL	196	// Determine the message number and dispatch
	197	switch (Number)
	198	{
0a8a80e5	199	// 100 Capabilities
3b5421b4 AL	200	case 100:
	201	if (Capabilities(Message) == false)
	202	return _error->Error("Unable to process Capabilities message from %s",Access.c_str());
	203	break;
0a8a80e5 AL	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:
c88edf1d AL	218	{
	219	if (Itm == 0)
	220	{
93bf083d	221	_error->Error("Method gave invalid 200 URI Start message");
c88edf1d AL	222	break;
	223	}
	224	CurrentItem = Itm;
	225	CurrentSize = 0;
	226	TotalSize = atoi(LookupTag(Message,"Size","0").c_str());
	227
	228	break;
	229	}
0a8a80e5 AL	230
	231	// 201 URI Done
	232	case 201:
c88edf1d AL	233	{
	234	if (Itm == 0)
	235	{
93bf083d	236	_error->Error("Method gave invalid 201 URI Done message");
c88edf1d AL	237	break;
	238	}
	239
bfd22fc0	240	pkgAcquire::Item *Owner = Itm->Owner;
be4401bf	241	OwnerQ->ItemDone(Itm);
bfd22fc0	242	Owner->Done(Message,atoi(LookupTag(Message,"Size","0").c_str()),
c88edf1d	243	LookupTag(Message,"MD5-Hash"));
c88edf1d AL	244	break;
c88edf1d AL	245	}
0a8a80e5 AL	246
	247	// 400 URI Failure
	248	case 400:
c88edf1d AL	249	{
	250	if (Itm == 0)
	251	{
93bf083d	252	_error->Error("Method gave invalid 400 URI Failure message");
c88edf1d AL	253	break;
	254	}
	255
bfd22fc0	256	pkgAcquire::Item *Owner = Itm->Owner;
c88edf1d	257	OwnerQ->ItemDone(Itm);
bfd22fc0	258	Owner->Failed(Message);
c88edf1d AL	259	break;
c88edf1d AL	260	}
0a8a80e5 AL	261
	262	// 401 General Failure
	263	case 401:
	264	_error->Error("Method %s General failure: %s",LookupTag(Message,"Message").c_str());
	265	break;
3b5421b4 AL	266	}
	267	}
	268	return true;
	269	}
	270	/}}}/
	271	// Worker::Capabilities - 100 Capabilities handler /{{{/
	272	// ---------------------------------------------------------------------
	273	/* This parses the capabilities message and dumps it into the configuration
	274	structure. */
	275	bool pkgAcquire::Worker::Capabilities(string Message)
	276	{
	277	if (Config == 0)
	278	return true;
	279
	280	Config->Version = LookupTag(Message,"Version");
	281	Config->SingleInstance = StringToBool(LookupTag(Message,"Single-Instance"),false);
	282	Config->PreScan = StringToBool(LookupTag(Message,"Pre-Scan"),false);
0a8a80e5 AL	283	Config->Pipeline = StringToBool(LookupTag(Message,"Pipeline"),false);
0a8a80e5 AL	284	Config->SendConfig = StringToBool(LookupTag(Message,"Send-Config"),false);
3b5421b4 AL	285
	286	// Some debug text
	287	if (Debug == true)
	288	{
	289	clog << "Configured access method " << Config->Access << endl;
0a8a80e5 AL	290	clog << "Version:" << Config->Version << " SingleInstance:" <<
	291	Config->SingleInstance << " PreScan: " << Config->PreScan <<
	292	" Pipeline:" << Config->Pipeline << " SendConfig:" <<
	293	Config->SendConfig << endl;
3b5421b4 AL	294	}
	295
	296	return true;
	297	}
0118833a	298	/}}}/
0a8a80e5 AL	299	// Worker::SendConfiguration - Send the config to the method /{{{/
	300	// ---------------------------------------------------------------------
	301	/* */
	302	bool pkgAcquire::Worker::SendConfiguration()
	303	{
	304	if (Config->SendConfig == false)
	305	return true;
	306
	307	if (OutFd == -1)
	308	return false;
	309
	310	string Message = "601 Configuration\n";
	311	Message.reserve(2000);
	312
	313	/* Write out all of the configuration directives by walking the
	314	configuration tree */
	315	const Configuration::Item *Top = _config->Tree(0);
	316	for (; Top != 0;)
	317	{
	318	if (Top->Value.empty() == false)
	319	{
	320	string Line = "Config-Item: " + Top->FullTag() + "=";
	321	Line += QuoteString(Top->Value,"\n") + '\n';
	322	Message += Line;
	323	}
	324
	325	if (Top->Child != 0)
	326	{
	327	Top = Top->Child;
	328	continue;
	329	}
	330
	331	while (Top != 0 && Top->Next == 0)
	332	Top = Top->Parent;
	333	if (Top != 0)
	334	Top = Top->Next;
	335	}
	336	Message += '\n';
	337
	338	if (Debug == true)
	339	clog << " -> " << Access << ':' << QuoteString(Message,"\n") << endl;
	340	OutQueue += Message;
	341	OutReady = true;
	342
	343	return true;
	344	}
	345	/}}}/
	346	// Worker::QueueItem - Add an item to the outbound queue /{{{/
	347	// ---------------------------------------------------------------------
	348	/* Send a URI Acquire message to the method */
	349	bool pkgAcquire::Worker::QueueItem(pkgAcquire::Queue::QItem *Item)
	350	{
	351	if (OutFd == -1)
	352	return false;
	353
	354	string Message = "600 URI Acquire\n";
	355	Message.reserve(300);
	356	Message += "URI: " + Item->URI;
	357	Message += "\nFilename: " + Item->Owner->DestFile;
	358	Message += Item->Owner->Custom600Headers();
	359	Message += "\n\n";
	360
	361	if (Debug == true)
	362	clog << " -> " << Access << ':' << QuoteString(Message,"\n") << endl;
363	OutQueue += Message;
364	OutReady = true;
365
366	return true;
367	}
368	/}}}/
369	// Worker::OutFdRead - Out bound FD is ready /{{{/
370	// ---------------------------------------------------------------------
371	/* */
372	bool pkgAcquire::Worker::OutFdReady()
373	{
374	int Res = write(OutFd,OutQueue.begin(),OutQueue.length());
375	if (Res <= 0)
376	return MethodFailure();
377
378	// Hmm.. this should never happen.
379	if (Res < 0)
380	return true;
381
382	OutQueue.erase(0,Res);
383	if (OutQueue.empty() == true)
384	OutReady = false;
385
386	return true;
387	}
388	/}}}/
389	// Worker::InFdRead - In bound FD is ready /{{{/
390	// ---------------------------------------------------------------------
391	/* */
392	bool pkgAcquire::Worker::InFdReady()
393	{
394	if (ReadMessages() == false)
395	return false;
396	RunMessages();
397	return true;
398	}
399	/}}}/
400	// Worker::MethodFailure - Called when the method fails /{{{/
401	// ---------------------------------------------------------------------
402	/* This is called when the method is belived to have failed, probably because
403	read returned -1. */
404	bool pkgAcquire::Worker::MethodFailure()
405	{
406	cerr << "Method " << Access << " has died unexpectedly!" << endl;
407	if (waitpid(Process,0,0) != Process)
408	_error->Warning("I waited but nothing was there!");
409	Process = -1;
410	close(InFd);
411	close(OutFd);
412	InFd = -1;
413	OutFd = -1;
414	OutReady = false;
415	InReady = false;
416	OutQueue = string();
417	MessageQueue.erase(MessageQueue.begin(),MessageQueue.end());
418
419	return false;
420	}
421	/}}}/