Annotation of loncom/loncnew, revision 1.9
1.1 foxr 1: #!/usr/bin/perl
1.2 albertel 2: # The LearningOnline Network with CAPA
3: # lonc maintains the connections to remote computers
4: #
1.9 ! foxr 5: # $Id: loncnew,v 1.8 2003/06/11 02:04:35 foxr Exp $
1.2 albertel 6: #
7: # Copyright Michigan State University Board of Trustees
8: #
9: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
10: #
11: # LON-CAPA is free software; you can redistribute it and/or modify
12: # it under the terms of the GNU General Public License as published by
13: # the Free Software Foundation; either version 2 of the License, or
14: # (at your option) any later version.
15: #
16: # LON-CAPA is distributed in the hope that it will be useful,
17: # but WITHOUT ANY WARRANTY; without even the implied warranty of
18: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19: # GNU General Public License for more details.
20: #
21: # You should have received a copy of the GNU General Public License
22: # along with LON-CAPA; if not, write to the Free Software
23: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24: #
25: # /home/httpd/html/adm/gpl.txt
26: #
27: # http://www.lon-capa.org/
28: #
1.1 foxr 29: #
30: # new lonc handles n requestors spread out bver m connections to londs.
31: # This module is based on the Event class.
32: # Development iterations:
33: # - Setup basic event loop. (done)
34: # - Add timer dispatch. (done)
35: # - Add ability to accept lonc UNIX domain sockets. (done)
36: # - Add ability to create/negotiate lond connections (done).
1.7 foxr 37: # - Add general logic for dispatching requests and timeouts. (done).
38: # - Add support for the lonc/lond requests. (done).
1.1 foxr 39: # - Add logging/status monitoring.
40: # - Add Signal handling - HUP restarts. USR1 status report.
1.7 foxr 41: # - Add Configuration file I/O (done).
1.1 foxr 42: # - Add management/status request interface.
1.8 foxr 43: # - Add deferred request capability. (done)
1.9 ! foxr 44: # - Detect transmission timeouts.
1.7 foxr 45: #
46:
47: # Change log:
1.8 foxr 48: # $Log: loncnew,v $
1.9 ! foxr 49: # Revision 1.8 2003/06/11 02:04:35 foxr
! 50: # Support delayed transactions... this is done uniformly by encapsulating
! 51: # transactions in an object ... a LondTransaction that is implemented by
! 52: # LondTransaction.pm
! 53: #
1.8 foxr 54: # Revision 1.7 2003/06/03 01:59:39 foxr
55: # complete coding to support deferred transactions.
56: #
1.7 foxr 57: #
1.1 foxr 58:
59: use lib "/home/httpd/lib/perl/";
60: use lib "/home/foxr/newloncapa/types";
61: use Event qw(:DEFAULT );
62: use POSIX qw(:signal_h);
63: use IO::Socket;
64: use IO::Socket::INET;
65: use IO::Socket::UNIX;
1.9 ! foxr 66: use IO::File;
1.6 foxr 67: use IO::Handle;
1.1 foxr 68: use Socket;
69: use Crypt::IDEA;
70: use LONCAPA::Queue;
71: use LONCAPA::Stack;
72: use LONCAPA::LondConnection;
1.7 foxr 73: use LONCAPA::LondTransaction;
1.1 foxr 74: use LONCAPA::Configuration;
75: use LONCAPA::HashIterator;
76:
77:
78: #
79: # Disable all signals we might receive from outside for now.
80: #
81: $SIG{QUIT} = IGNORE;
82: $SIG{HUP} = IGNORE;
83: $SIG{USR1} = IGNORE;
84: $SIG{INT} = IGNORE;
85: $SIG{CHLD} = IGNORE;
86: $SIG{__DIE__} = IGNORE;
87:
88:
89: # Read the httpd configuration file to get perl variables
90: # normally set in apache modules:
91:
92: my $perlvarref = LONCAPA::Configuration::read_conf('loncapa.conf');
93: my %perlvar = %{$perlvarref};
94:
95: #
96: # parent and shared variables.
97:
98: my %ChildHash; # by pid -> host.
99:
100:
1.9 ! foxr 101: my $MaxConnectionCount = 10; # Will get from config later.
1.1 foxr 102: my $ClientConnection = 0; # Uniquifier for client events.
103:
1.9 ! foxr 104: my $DebugLevel = 0;
1.1 foxr 105: my $IdleTimeout= 3600; # Wait an hour before pruning connections.
106:
107: #
108: # The variables below are only used by the child processes.
109: #
110: my $RemoteHost; # Name of host child is talking to.
111: my $UnixSocketDir= "/home/httpd/sockets";
112: my $IdleConnections = Stack->new(); # Set of idle connections
113: my %ActiveConnections; # Connections to the remote lond.
1.7 foxr 114: my %ActiveTransactions; # LondTransactions in flight.
1.1 foxr 115: my %ActiveClients; # Serial numbers of active clients by socket.
116: my $WorkQueue = Queue->new(); # Queue of pending transactions.
117: my $ConnectionCount = 0;
1.4 foxr 118: my $IdleSeconds = 0; # Number of seconds idle.
1.9 ! foxr 119: my $Status = ""; # Current status string.
! 120:
1.1 foxr 121:
122: #
1.9 ! foxr 123: # The hash below gives the HTML format for log messages
! 124: # given a severity.
! 125: #
! 126: my %LogFormats;
! 127:
! 128: $LogFormats{"CRITICAL"} = "<font color=red>CRITICAL: %s</font>";
! 129: $LogFormats{"SUCCESS"} = "<font color=green>SUCCESS: %s</font>";
! 130: $LogFormats{"INFO"} = "<font color=yellow>INFO: %s</font>";
! 131: $LogFormats{"WARNING"} = "<font color=blue>WARNING: %s</font>";
! 132: $LogFormats{"DEFAULT"} = " %s ";
! 133:
! 134: my $lastlog = ''; # Used for status reporting.
! 135:
! 136: =pod
! 137:
! 138: =head2 Log
! 139:
! 140: Logs a message to the log file.
! 141: Parameters:
! 142:
! 143: =item severity
! 144:
! 145: One of CRITICAL, WARNING, INFO, SUCCESS used to select the
! 146: format string used to format the message. if the severity is
! 147: not a defined severity the Default format string is used.
! 148:
! 149: =item message
! 150:
! 151: The base message. In addtion to the format string, the message
! 152: will be appended to a string containing the name of our remote
! 153: host and the time will be formatted into the message.
! 154:
! 155: =cut
! 156:
! 157: sub Log {
! 158: my $severity = shift;
! 159: my $message = shift;
! 160:
! 161: if(!$LogFormats{$severity}) {
! 162: $severity = "DEFAULT";
! 163: }
! 164:
! 165: my $format = $LogFormats{$severity};
! 166:
! 167: # Put the window dressing in in front of the message format:
! 168:
! 169: my $now = time;
! 170: my $local = localtime($now);
! 171: my $finalformat = "$local ($$) [$RemoteHost] [$Status] ";
! 172: my $finalformat = $finalformat.$format."\n";
! 173:
! 174: # open the file and put the result.
! 175:
! 176: my $execdir = $perlvar{'lonDaemons'};
! 177: my $fh = IO::File->new(">>$execdir/logs/lonc.log");
! 178: my $msg = sprintf($finalformat, $message);
! 179: print $fh $msg;
! 180:
! 181: }
1.6 foxr 182:
1.3 albertel 183:
1.1 foxr 184: =pod
1.3 albertel 185:
186: =head2 GetPeerName
187:
188: Returns the name of the host that a socket object is connected to.
189:
1.1 foxr 190: =cut
191:
192: sub GetPeername {
193: my $connection = shift;
194: my $AdrFamily = shift;
195: my $peer = $connection->peername();
196: my $peerport;
197: my $peerip;
198: if($AdrFamily == AF_INET) {
199: ($peerport, $peerip) = sockaddr_in($peer);
200: my $peername = gethostbyaddr($iaddr, $AdrFamily);
201: return $peername;
202: } elsif ($AdrFamily == AF_UNIX) {
203: my $peerfile;
204: ($peerfile) = sockaddr_un($peer);
205: return $peerfile;
206: }
207: }
208: #----------------------------- Timer management ------------------------
209: =pod
1.3 albertel 210:
1.1 foxr 211: =head2 Debug
1.3 albertel 212:
213: Invoked to issue a debug message.
214:
1.1 foxr 215: =cut
1.3 albertel 216:
1.1 foxr 217: sub Debug {
218: my $level = shift;
219: my $message = shift;
220: if ($level <= $DebugLevel) {
221: print $message." host = ".$RemoteHost."\n";
222: }
223: }
224:
225: sub SocketDump {
226: my $level = shift;
227: my $socket= shift;
228: if($level <= $DebugLevel) {
229: $socket->Dump();
230: }
231: }
1.3 albertel 232:
1.1 foxr 233: =pod
1.3 albertel 234:
1.5 foxr 235: =head2 ShowStatus
236:
237: Place some text as our pid status.
238:
239: =cut
240: sub ShowStatus {
241: my $status = shift;
242: $0 = "lonc: ".$status;
1.9 ! foxr 243: $Status = $status; # Make available for logging.
! 244:
1.5 foxr 245: }
246:
247: =pod
248:
1.1 foxr 249: =head2 Tick
1.3 albertel 250:
251: Invoked each timer tick.
252:
1.1 foxr 253: =cut
254:
1.5 foxr 255:
1.1 foxr 256: sub Tick {
257: my $client;
1.5 foxr 258: ShowStatus(GetServerHost()." Connection count: ".$ConnectionCount);
1.1 foxr 259: Debug(6, "Tick");
260: Debug(6, " Current connection count: ".$ConnectionCount);
261: foreach $client (keys %ActiveClients) {
262: Debug(7, " Have client: with id: ".$ActiveClients{$client});
263: }
1.4 foxr 264: # Is it time to prune connection count:
265:
266:
267: if($IdleConnections->Count() &&
268: ($WorkQueue->Count() == 0)) { # Idle connections and nothing to do?
269: $IdleSeconds++;
270: if($IdleSeconds > $IdleTimeout) { # Prune a connection...
271: $Socket = $IdleConnections->pop();
1.6 foxr 272: KillSocket($Socket);
1.4 foxr 273: }
274: } else {
275: $IdleSeconds = 0; # Reset idle count if not idle.
276: }
1.5 foxr 277:
278: # Do we have work in the queue, but no connections to service them?
279: # If so, try to make some new connections to get things going again.
280: #
281:
282: my $Requests = $WorkQueue->Count();
283: if (($ConnectionCount == 0) && ($Requests > 0)) {
284: my $Connections = ($Requests <= $MaxConnectionCount) ?
285: $Requests : $MaxConnectionCount;
286: Debug(1,"Work but no connections, starting ".$Connections." of them");
287: for ($i =0; $i < $Connections; $i++) {
288: MakeLondConnection();
289: }
290:
291: }
1.1 foxr 292: }
293:
294: =pod
1.3 albertel 295:
1.1 foxr 296: =head2 SetupTimer
297:
1.3 albertel 298: Sets up a 1 per sec recurring timer event. The event handler is used to:
1.1 foxr 299:
1.3 albertel 300: =item
301:
302: Trigger timeouts on communications along active sockets.
303:
304: =item
305:
306: Trigger disconnections of idle sockets.
1.1 foxr 307:
308: =cut
309:
310: sub SetupTimer {
311: Debug(6, "SetupTimer");
312: Event->timer(interval => 1, debug => 1, cb => \&Tick );
313: }
1.3 albertel 314:
1.1 foxr 315: =pod
1.3 albertel 316:
1.1 foxr 317: =head2 ServerToIdle
1.3 albertel 318:
319: This function is called when a connection to the server is
320: ready for more work.
321:
322: If there is work in the Work queue the top element is dequeued
1.1 foxr 323: and the connection will start to work on it. If the work queue is
324: empty, the connection is pushed on the idle connection stack where
325: it will either get another work unit, or alternatively, if it sits there
326: long enough, it will be shut down and released.
327:
1.3 albertel 328: =cut
1.1 foxr 329:
330: sub ServerToIdle {
331: my $Socket = shift; # Get the socket.
1.7 foxr 332: delete($ActiveTransactions{$Socket}); # Server has no transaction
1.1 foxr 333:
334: &Debug(6, "Server to idle");
335:
336: # If there's work to do, start the transaction:
337:
1.7 foxr 338: $reqdata = $WorkQueue->dequeue(); # This is a LondTransaction
1.1 foxr 339: unless($reqdata eq undef) {
1.7 foxr 340: Debug(9, "Queue gave request data: ".$reqdata->getRequest());
341: &StartRequest($Socket, $reqdata);
1.8 foxr 342:
1.1 foxr 343: } else {
344:
345: # There's no work waiting, so push the server to idle list.
346: &Debug(8, "No new work requests, server connection going idle");
347: $IdleConnections->push($Socket);
348: }
349: }
1.3 albertel 350:
1.1 foxr 351: =pod
1.3 albertel 352:
1.1 foxr 353: =head2 ClientWritable
1.3 albertel 354:
355: Event callback for when a client socket is writable.
356:
357: This callback is established when a transaction reponse is
358: avaiable from lond. The response is forwarded to the unix socket
359: as it becomes writable in this sub.
360:
1.1 foxr 361: Parameters:
362:
1.3 albertel 363: =item Event
364:
365: The event that has been triggered. Event->w->data is
366: the data and Event->w->fd is the socket to write.
1.1 foxr 367:
368: =cut
1.3 albertel 369:
1.1 foxr 370: sub ClientWritable {
371: my $Event = shift;
372: my $Watcher = $Event->w;
373: my $Data = $Watcher->data;
374: my $Socket = $Watcher->fd;
375:
376: # Try to send the data:
377:
378: &Debug(6, "ClientWritable writing".$Data);
379: &Debug(9, "Socket is: ".$Socket);
380:
1.6 foxr 381: if($Socket->connected) {
382: my $result = $Socket->send($Data, 0);
383:
384: # $result undefined: the write failed.
385: # otherwise $result is the number of bytes written.
386: # Remove that preceding string from the data.
387: # If the resulting data is empty, destroy the watcher
388: # and set up a read event handler to accept the next
389: # request.
390:
391: &Debug(9,"Send result is ".$result." Defined: ".defined($result));
392: if(defined($result)) {
393: &Debug(9, "send result was defined");
394: if($result == length($Data)) { # Entire string sent.
395: &Debug(9, "ClientWritable data all written");
396: $Watcher->cancel();
397: #
398: # Set up to read next request from socket:
399:
400: my $descr = sprintf("Connection to lonc client %d",
401: $ActiveClients{$Socket});
402: Event->io(cb => \&ClientRequest,
403: poll => 'r',
404: desc => $descr,
405: data => "",
406: fd => $Socket);
407:
408: } else { # Partial string sent.
409: $Watcher->data(substr($Data, $result));
410: }
411:
412: } else { # Error of some sort...
413:
414: # Some errnos are possible:
415: my $errno = $!;
416: if($errno == POSIX::EWOULDBLOCK ||
417: $errno == POSIX::EAGAIN ||
418: $errno == POSIX::EINTR) {
419: # No action taken?
420: } else { # Unanticipated errno.
421: &Debug(5,"ClientWritable error or peer shutdown".$RemoteHost);
422: $Watcher->cancel; # Stop the watcher.
423: $Socket->shutdown(2); # Kill connection
424: $Socket->close(); # Close the socket.
425: }
1.1 foxr 426:
427: }
1.6 foxr 428: } else {
429: $Watcher->cancel(); # A delayed request...just cancel.
1.1 foxr 430: }
431: }
432:
433: =pod
1.3 albertel 434:
1.1 foxr 435: =head2 CompleteTransaction
1.3 albertel 436:
437: Called when the reply data has been received for a lond
1.1 foxr 438: transaction. The reply data must now be sent to the
439: ultimate client on the other end of the Unix socket. This is
440: done by setting up a writable event for the socket with the
441: data the reply data.
1.3 albertel 442:
1.1 foxr 443: Parameters:
1.3 albertel 444:
445: =item Socket
446:
447: Socket on which the lond transaction occured. This is a
448: LondConnection. The data received is in the TransactionReply member.
449:
1.7 foxr 450: =item Transaction
1.3 albertel 451:
1.7 foxr 452: The transaction that is being completed.
1.1 foxr 453:
454: =cut
1.3 albertel 455:
1.1 foxr 456: sub CompleteTransaction {
457: &Debug(6,"Complete transaction");
458: my $Socket = shift;
1.7 foxr 459: my $Transaction = shift;
1.1 foxr 460:
1.7 foxr 461: if (!$Transaction->isDeferred()) { # Normal transaction
462: my $data = $Socket->GetReply(); # Data to send.
463: StartClientReply($Transaction, $data);
464: } else { # Delete deferred transaction file.
1.9 ! foxr 465: Log("SUCCESS", "A delayed transaction was completed");
1.7 foxr 466: unlink $Transaction->getFile();
467: }
1.6 foxr 468: }
469: =pod
470: =head1 StartClientReply
471:
472: Initiates a reply to a client where the reply data is a parameter.
473:
1.7 foxr 474: =head2 parameters:
475:
476: =item Transaction
477:
478: The transaction for which we are responding to the client.
479:
480: =item data
481:
482: The data to send to apached client.
483:
1.6 foxr 484: =cut
485: sub StartClientReply {
1.7 foxr 486: my $Transaction = shift;
1.6 foxr 487: my $data = shift;
1.1 foxr 488:
1.7 foxr 489: my $Client = $Transaction->getClient();
490:
1.1 foxr 491: &Debug(8," Reply was: ".$data);
492: my $Serial = $ActiveClients{$Client};
493: my $desc = sprintf("Connection to lonc client %d",
1.6 foxr 494:
1.1 foxr 495: $Serial);
496: Event->io(fd => $Client,
497: poll => "w",
498: desc => $desc,
499: cb => \&ClientWritable,
500: data => $data);
501: }
1.4 foxr 502: =pod
503: =head2 FailTransaction
504:
505: Finishes a transaction with failure because the associated lond socket
1.7 foxr 506: disconnected. There are two possibilities:
507: - The transaction is deferred: in which case we just quietly
508: delete the transaction since there is no client connection.
509: - The transaction is 'live' in which case we initiate the sending
510: of "con_lost" to the client.
511:
512: Deleting the transaction means killing it from the
513: %ActiveTransactions hash.
1.4 foxr 514:
515: Parameters:
516:
517: =item client
518:
1.7 foxr 519: The LondTransaction we are failing.
520:
1.4 foxr 521: =cut
522:
523: sub FailTransaction {
1.7 foxr 524: my $transaction = shift;
525: my $Lond = $transaction->getServer();
526: if (!$client->isDeferred()) { # If the transaction is deferred we'll get to it.
527: my $client = $transcation->getClient();
528: StartClientReply($client, "con_lost");
529: }
530: # not needed, done elsewhere if active.
531: # delete $ActiveTransactions{$Lond};
1.4 foxr 532:
533: }
534:
535: =pod
1.6 foxr 536: =head1 EmptyQueue
1.7 foxr 537:
1.6 foxr 538: Fails all items in the work queue with con_lost.
1.7 foxr 539: Note that each item in the work queue is a transaction.
540:
1.6 foxr 541: =cut
542: sub EmptyQueue {
543: while($WorkQueue->Count()) {
1.7 foxr 544: my $request = $Workqueue->dequeue(); # This is a transaction
545: FailTransaction($request);
1.6 foxr 546: }
547: }
548:
549: =pod
1.4 foxr 550:
1.9 ! foxr 551: =head2 CloseAllLondConnections
! 552:
! 553: Close all connections open on lond prior to exit e.g.
! 554:
! 555: =cut
! 556: sub CloseAllLondConnections {
! 557: foreach $Socket (keys %ActiveConnections) {
! 558: KillSocket($Socket);
! 559: }
! 560: }
! 561: =cut
! 562:
! 563: =pod
! 564:
1.4 foxr 565: =head2 KillSocket
566:
567: Destroys a socket. This function can be called either when a socket
568: has died of 'natural' causes or because a socket needs to be pruned due to
569: idleness. If the socket has died naturally, if there are no longer any
570: live connections a new connection is created (in case there are transactions
571: in the queue). If the socket has been pruned, it is never re-created.
572:
573: Parameters:
1.1 foxr 574:
1.4 foxr 575: =item Socket
576:
577: The socket to kill off.
578:
579: =item Restart
580:
581: nonzero if we are allowed to create a new connection.
582:
583:
584: =cut
585: sub KillSocket {
586: my $Socket = shift;
587:
1.9 ! foxr 588: $Socket->Shutdown();
! 589:
1.7 foxr 590: # If the socket came from the active connection set,
591: # delete its transaction... note that FailTransaction should
592: # already have been called!!!
593: # otherwise it came from the idle set.
594: #
1.4 foxr 595:
596: if(exists($ActiveTransactions{$Socket})) {
597: delete ($ActiveTransactions{$Socket});
598: }
599: if(exists($ActiveConnections{$Socket})) {
600: delete($ActiveConnections{$Socket});
601: }
602: $ConnectionCount--;
1.6 foxr 603:
604: # If the connection count has gone to zero and there is work in the
605: # work queue, the work all gets failed with con_lost.
606: #
607: if($ConnectionCount == 0) {
608: EmptyQueue;
1.4 foxr 609: }
610: }
1.1 foxr 611:
612: =pod
1.3 albertel 613:
1.1 foxr 614: =head2 LondReadable
1.3 albertel 615:
1.1 foxr 616: This function is called whenever a lond connection
617: is readable. The action is state dependent:
618:
1.3 albertel 619: =head3 State=Initialized
620:
621: We''re waiting for the challenge, this is a no-op until the
1.1 foxr 622: state changes.
1.3 albertel 623:
1.1 foxr 624: =head3 State=Challenged
1.3 albertel 625:
626: The challenge has arrived we need to transition to Writable.
1.1 foxr 627: The connection must echo the challenge back.
1.3 albertel 628:
1.1 foxr 629: =head3 State=ChallengeReplied
1.3 albertel 630:
631: The challenge has been replied to. The we are receiveing the
1.1 foxr 632: 'ok' from the partner.
1.3 albertel 633:
1.1 foxr 634: =head3 State=RequestingKey
1.3 albertel 635:
636: The ok has been received and we need to send the request for
1.1 foxr 637: an encryption key. Transition to writable for that.
1.3 albertel 638:
1.1 foxr 639: =head3 State=ReceivingKey
1.3 albertel 640:
641: The the key has been requested, now we are reading the new key.
642:
1.1 foxr 643: =head3 State=Idle
1.3 albertel 644:
645: The encryption key has been negotiated or we have finished
1.1 foxr 646: reading data from the a transaction. If the callback data has
647: a client as well as the socket iformation, then we are
648: doing a transaction and the data received is relayed to the client
649: before the socket is put on the idle list.
1.3 albertel 650:
1.1 foxr 651: =head3 State=SendingRequest
1.3 albertel 652:
653: I do not think this state can be received here, but if it is,
1.1 foxr 654: the appropriate thing to do is to transition to writable, and send
655: the request.
1.3 albertel 656:
1.1 foxr 657: =head3 State=ReceivingReply
1.3 albertel 658:
659: We finished sending the request to the server and now transition
1.1 foxr 660: to readable to receive the reply.
661:
662: The parameter to this function are:
1.3 albertel 663:
1.1 foxr 664: The event. Implicit in this is the watcher and its data. The data
665: contains at least the lond connection object and, if a
666: transaction is in progress, the socket attached to the local client.
667:
1.3 albertel 668: =cut
1.1 foxr 669:
670: sub LondReadable {
1.8 foxr 671:
1.1 foxr 672: my $Event = shift;
673: my $Watcher = $Event->w;
674: my $Socket = $Watcher->data;
675: my $client = undef;
676:
1.8 foxr 677: &Debug(6,"LondReadable called state = ".$State);
678:
1.1 foxr 679:
680: my $State = $Socket->GetState(); # All action depends on the state.
681:
682: SocketDump(6, $Socket);
683:
684: if($Socket->Readable() != 0) {
1.4 foxr 685: # bad return from socket read. Currently this means that
686: # The socket has become disconnected. We fail the transaction.
687:
688: if(exists($ActiveTransactions{$Socket})) {
689: Debug(3,"Lond connection lost failing transaction");
690: FailTransaction($ActiveTransactions{$Socket});
691: }
692: $Watcher->cancel();
1.6 foxr 693: KillSocket($Socket);
1.4 foxr 694: return;
1.1 foxr 695: }
696: SocketDump(6,$Socket);
697:
698: $State = $Socket->GetState(); # Update in case of transition.
699: &Debug(6, "After read, state is ".$State);
700:
701: if($State eq "Initialized") {
702:
703:
704: } elsif ($State eq "ChallengeReceived") {
705: # The challenge must be echoed back; The state machine
706: # in the connection takes care of setting that up. Just
707: # need to transition to writable:
708:
1.8 foxr 709: $Watcher->cb(\&LondWritable);
1.1 foxr 710: $Watcher->poll("w");
711:
712: } elsif ($State eq "ChallengeReplied") {
713:
714:
715: } elsif ($State eq "RequestingKey") {
716: # The ok was received. Now we need to request the key
717: # That requires us to be writable:
718:
1.8 foxr 719: $Watcher->cb(\&LondWritable);
1.1 foxr 720: $Watcher->poll("w");
721:
722: } elsif ($State eq "ReceivingKey") {
723:
724: } elsif ($State eq "Idle") {
725: # If necessary, complete a transaction and then go into the
726: # idle queue.
1.8 foxr 727: $Watcher->cancel();
1.1 foxr 728: if(exists($ActiveTransactions{$Socket})) {
729: Debug(8,"Completing transaction!!");
730: CompleteTransaction($Socket,
731: $ActiveTransactions{$Socket});
1.9 ! foxr 732: } else {
! 733: Log("SUCCESS", "Connection ".$ConnectionCount." to "
! 734: .$RemoteHost." now ready for action");
1.1 foxr 735: }
736: ServerToIdle($Socket); # Next work unit or idle.
1.6 foxr 737:
1.1 foxr 738: } elsif ($State eq "SendingRequest") {
739: # We need to be writable for this and probably don't belong
740: # here inthe first place.
741:
742: Deubg(6, "SendingRequest state encountered in readable");
743: $Watcher->poll("w");
744: $Watcher->cb(\&LondWritable);
745:
746: } elsif ($State eq "ReceivingReply") {
747:
748:
749: } else {
750: # Invalid state.
751: Debug(4, "Invalid state in LondReadable");
752: }
753: }
1.3 albertel 754:
1.1 foxr 755: =pod
1.3 albertel 756:
1.1 foxr 757: =head2 LondWritable
1.3 albertel 758:
1.1 foxr 759: This function is called whenever a lond connection
760: becomes writable while there is a writeable monitoring
761: event. The action taken is very state dependent:
1.3 albertel 762:
1.1 foxr 763: =head3 State = Connected
1.3 albertel 764:
765: The connection is in the process of sending the 'init' hailing to the
766: lond on the remote end. The connection object''s Writable member is
767: called. On error, ConnectionError is called to destroy the connection
768: and remove it from the ActiveConnections hash
769:
1.1 foxr 770: =head3 Initialized
1.3 albertel 771:
772: 'init' has been sent, writability monitoring is removed and
773: readability monitoring is started with LondReadable as the callback.
774:
1.1 foxr 775: =head3 ChallengeReceived
1.3 albertel 776:
777: The connection has received the who are you challenge from the remote
778: system, and is in the process of sending the challenge
779: response. Writable is called.
780:
1.1 foxr 781: =head3 ChallengeReplied
1.3 albertel 782:
783: The connection has replied to the initial challenge The we switch to
784: monitoring readability looking for the server to reply with 'ok'.
785:
1.1 foxr 786: =head3 RequestingKey
1.3 albertel 787:
788: The connection is in the process of requesting its encryption key.
789: Writable is called.
790:
1.1 foxr 791: =head3 ReceivingKey
1.3 albertel 792:
793: The connection has sent the request for a key. Switch to readability
794: monitoring to accept the key
795:
1.1 foxr 796: =head3 SendingRequest
1.3 albertel 797:
798: The connection is in the process of sending a request to the server.
799: This request is part of a client transaction. All the states until
800: now represent the client setup protocol. Writable is called.
801:
1.1 foxr 802: =head3 ReceivingReply
803:
1.3 albertel 804: The connection has sent a request. Now it must receive a reply.
805: Readability monitoring is requested.
806:
807: This function is an event handler and therefore receives as
1.1 foxr 808: a parameter the event that has fired. The data for the watcher
809: of this event is a reference to a list of one or two elements,
810: depending on state. The first (and possibly only) element is the
811: socket. The second (present only if a request is in progress)
812: is the socket on which to return a reply to the caller.
813:
814: =cut
1.3 albertel 815:
1.1 foxr 816: sub LondWritable {
817: my $Event = shift;
818: my $Watcher = $Event->w;
1.8 foxr 819: my $Socket = $Watcher->data;
820: my $State = $Socket->GetState();
1.1 foxr 821:
1.8 foxr 822: Debug(6,"LondWritable State = ".$State."\n");
1.1 foxr 823:
1.8 foxr 824:
1.1 foxr 825: # Figure out what to do depending on the state of the socket:
826:
827:
828:
829:
830: SocketDump(6,$Socket);
831:
832: if ($State eq "Connected") {
833:
834: if ($Socket->Writable() != 0) {
835: # The write resulted in an error.
1.4 foxr 836: # We'll treat this as if the socket got disconnected:
1.9 ! foxr 837: Log("WARNING", "Connection to ".$RemoteHost.
! 838: " has been disconnected");
1.4 foxr 839: $Watcher->cancel();
1.6 foxr 840: KillSocket($Socket);
1.4 foxr 841: return;
1.1 foxr 842: }
1.4 foxr 843: # "init" is being sent...
844:
1.1 foxr 845:
846: } elsif ($State eq "Initialized") {
847:
848: # Now that init was sent, we switch
849: # to watching for readability:
850:
1.8 foxr 851: $Watcher->cb(\&LondReadable);
1.1 foxr 852: $Watcher->poll("r");
853:
854: } elsif ($State eq "ChallengeReceived") {
855: # We received the challenge, now we
856: # are echoing it back. This is a no-op,
857: # we're waiting for the state to change
858:
859: if($Socket->Writable() != 0) {
1.5 foxr 860:
861: $Watcher->cancel();
1.6 foxr 862: KillSocket($Socket);
1.5 foxr 863: return;
1.1 foxr 864: }
865:
866: } elsif ($State eq "ChallengeReplied") {
867: # The echo was sent back, so we switch
868: # to watching readability.
869:
1.8 foxr 870: $Watcher->cb(\&LondReadable);
1.1 foxr 871: $Watcher->poll("r");
872:
873: } elsif ($State eq "RequestingKey") {
874: # At this time we're requesting the key.
875: # again, this is essentially a no-op.
876: # we'll write the next chunk until the
877: # state changes.
878:
879: if($Socket->Writable() != 0) {
880: # Write resulted in an error.
1.5 foxr 881:
882: $Watcher->cancel();
1.6 foxr 883: KillSocket($Socket);
1.5 foxr 884: return;
885:
1.1 foxr 886: }
887: } elsif ($State eq "ReceivingKey") {
888: # Now we need to wait for the key
889: # to come back from the peer:
890:
1.8 foxr 891: $Watcher->cb(\&LondReadable);
1.1 foxr 892: $Watcher->poll("r");
893:
894: } elsif ($State eq "SendingRequest") {
895: # At this time we are sending a request to the
896: # peer... write the next chunk:
897:
898: if($Socket->Writable() != 0) {
899:
1.5 foxr 900: if(exists($ActiveTransactions{$Socket})) {
901: Debug(3, "Lond connection lost, failing transactions");
902: FailTransaction($ActiveTransactions{$Socket});
903: }
904: $Watcher->cancel();
1.6 foxr 905: KillSocket($Socket);
1.5 foxr 906: return;
907:
1.1 foxr 908: }
909:
910: } elsif ($State eq "ReceivingReply") {
911: # The send has completed. Wait for the
912: # data to come in for a reply.
913: Debug(8,"Writable sent request/receiving reply");
1.8 foxr 914: $Watcher->cb(\&LondReadable);
1.1 foxr 915: $Watcher->poll("r");
916:
917: } else {
918: # Control only passes here on an error:
919: # the socket state does not match any
920: # of the known states... so an error
921: # must be logged.
922:
923: &Debug(4, "Invalid socket state ".$State."\n");
924: }
925:
926: }
1.6 foxr 927: =pod
928:
929: =cut
930: sub QueueDelayed {
1.8 foxr 931: Debug(3,"QueueDelayed called");
932:
1.6 foxr 933: my $path = "$perlvar{'lonSockDir'}/delayed";
1.8 foxr 934:
935: Debug(4, "Delayed path: ".$path);
1.6 foxr 936: opendir(DIRHANDLE, $path);
1.8 foxr 937:
1.6 foxr 938: @alldelayed = grep /\.$RemoteHost$/, readdir DIRHANDLE;
1.8 foxr 939: Debug(4, "Got ".$alldelayed." delayed files");
1.6 foxr 940: closedir(DIRHANDLE);
941: my $dfname;
1.8 foxr 942: my $reqfile;
943: foreach $dfname (sort @alldelayed) {
944: $reqfile = "$path/$dfname";
945: Debug(4, "queueing ".$reqfile);
1.6 foxr 946: my $Handle = IO::File->new($reqfile);
947: my $cmd = <$Handle>;
1.8 foxr 948: chomp $cmd; # There may or may not be a newline...
949: $cmd = $cmd."\ny"; # now for sure there's exactly one newline.
1.7 foxr 950: my $Transaction = LondTransaction->new($cmd);
951: $Transaction->SetDeferred($reqfile);
952: QueueTransaction($Transaction);
1.6 foxr 953: }
954:
955: }
1.1 foxr 956:
957: =pod
1.3 albertel 958:
1.1 foxr 959: =head2 MakeLondConnection
1.3 albertel 960:
961: Create a new lond connection object, and start it towards its initial
962: idleness. Once idle, it becomes elligible to receive transactions
963: from the work queue. If the work queue is not empty when the
964: connection is completed and becomes idle, it will dequeue an entry and
965: start off on it.
966:
1.1 foxr 967: =cut
1.3 albertel 968:
1.1 foxr 969: sub MakeLondConnection {
970: Debug(4,"MakeLondConnection to ".GetServerHost()." on port "
971: .GetServerPort());
972:
973: my $Connection = LondConnection->new(&GetServerHost(),
974: &GetServerPort());
975:
976: if($Connection == undef) { # Needs to be more robust later.
1.9 ! foxr 977: Log("CRITICAL","Failed to make a connection with lond.");
1.5 foxr 978: } else {
979: # The connection needs to have writability
980: # monitored in order to send the init sequence
981: # that starts the whole authentication/key
982: # exchange underway.
983: #
984: my $Socket = $Connection->GetSocket();
985: if($Socket == undef) {
986: die "did not get a socket from the connection";
987: } else {
988: &Debug(9,"MakeLondConnection got socket: ".$Socket);
989: }
1.1 foxr 990:
1.5 foxr 991:
992: $event = Event->io(fd => $Socket,
993: poll => 'w',
994: cb => \&LondWritable,
1.8 foxr 995: data => $Connection,
1.5 foxr 996: desc => 'Connection to lond server');
997: $ActiveConnections{$Connection} = $event;
998:
999: $ConnectionCount++;
1.8 foxr 1000: Debug(4, "Connection count = ".$ConnectionCount);
1.6 foxr 1001: if($ConnectionCount == 1) { # First Connection:
1002: QueueDelayed;
1003: }
1.9 ! foxr 1004: Log("SUCESS", "Created connection ".$ConnectionCount
! 1005: ." to host ".GetServerHost());
1.1 foxr 1006: }
1007:
1008: }
1.3 albertel 1009:
1.1 foxr 1010: =pod
1.3 albertel 1011:
1.1 foxr 1012: =head2 StartRequest
1.3 albertel 1013:
1014: Starts a lond request going on a specified lond connection.
1015: parameters are:
1016:
1017: =item $Lond
1018:
1019: Connection to the lond that will send the transaction and receive the
1020: reply.
1021:
1022: =item $Client
1023:
1024: Connection to the client that is making this request We got the
1025: request from this socket, and when the request has been relayed to
1026: lond and we get a reply back from lond it will get sent to this
1027: socket.
1028:
1029: =item $Request
1030:
1031: The text of the request to send.
1032:
1.1 foxr 1033: =cut
1034:
1035: sub StartRequest {
1036: my $Lond = shift;
1.7 foxr 1037: my $Request = shift; # This is a LondTransaction.
1.1 foxr 1038:
1.7 foxr 1039: Debug(6, "StartRequest: ".$Request->getRequest());
1.1 foxr 1040:
1041: my $Socket = $Lond->GetSocket();
1042:
1.7 foxr 1043: $Request->Activate($Lond);
1044: $ActiveTransactions{$Lond} = $Request;
1.1 foxr 1045:
1.7 foxr 1046: $Lond->InitiateTransaction($Request->getRequest());
1.8 foxr 1047: $event = Event->io(fd => $Socket,
1.1 foxr 1048: poll => "w",
1049: cb => \&LondWritable,
1050: data => $Lond,
1051: desc => "lond transaction connection");
1052: $ActiveConnections{$Lond} = $event;
1053: Debug(8," Start Request made watcher data with ".$event->data."\n");
1054: }
1055:
1056: =pod
1.3 albertel 1057:
1.1 foxr 1058: =head2 QueueTransaction
1.3 albertel 1059:
1060: If there is an idle lond connection, it is put to work doing this
1061: transaction. Otherwise, the transaction is placed in the work queue.
1062: If placed in the work queue and the maximum number of connections has
1063: not yet been created, a new connection will be started. Our goal is
1064: to eventually have a sufficient number of connections that the work
1065: queue will typically be empty. parameters are:
1066:
1067: =item Socket
1068:
1069: open on the lonc client.
1070:
1071: =item Request
1072:
1073: data to send to the lond.
1.1 foxr 1074:
1075: =cut
1.3 albertel 1076:
1.1 foxr 1077: sub QueueTransaction {
1078:
1.7 foxr 1079: my $requestData = shift; # This is a LondTransaction.
1080: my $cmd = $requestData->getRequest();
1081:
1082: Debug(6,"QueueTransaction: ".$cmd);
1.1 foxr 1083:
1084: my $LondSocket = $IdleConnections->pop();
1085: if(!defined $LondSocket) { # Need to queue request.
1086: Debug(8,"Must queue...");
1087: $WorkQueue->enqueue($requestData);
1088: if($ConnectionCount < $MaxConnectionCount) {
1089: Debug(4,"Starting additional lond connection");
1090: MakeLondConnection();
1091: }
1092: } else { # Can start the request:
1093: Debug(8,"Can start...");
1.7 foxr 1094: StartRequest($LondSocket, $requestData);
1.1 foxr 1095: }
1096: }
1097:
1098: #-------------------------- Lonc UNIX socket handling ---------------------
1.3 albertel 1099:
1.1 foxr 1100: =pod
1.3 albertel 1101:
1.1 foxr 1102: =head2 ClientRequest
1.3 albertel 1103:
1104: Callback that is called when data can be read from the UNIX domain
1105: socket connecting us with an apache server process.
1.1 foxr 1106:
1107: =cut
1108:
1109: sub ClientRequest {
1110: Debug(6, "ClientRequest");
1111: my $event = shift;
1112: my $watcher = $event->w;
1113: my $socket = $watcher->fd;
1114: my $data = $watcher->data;
1115: my $thisread;
1116:
1117: Debug(9, " Watcher named: ".$watcher->desc);
1118:
1119: my $rv = $socket->recv($thisread, POSIX::BUFSIZ, 0);
1120: Debug(8, "rcv: data length = ".length($thisread)
1121: ." read =".$thisread);
1122: unless (defined $rv && length($thisread)) {
1123: # Likely eof on socket.
1124: Debug(5,"Client Socket closed on lonc for ".$RemoteHost);
1125: close($socket);
1126: $watcher->cancel();
1127: delete($ActiveClients{$socket});
1128: }
1129: Debug(8,"Data: ".$data." this read: ".$thisread);
1130: $data = $data.$thisread; # Append new data.
1131: $watcher->data($data);
1132: if($data =~ /(.*\n)/) { # Request entirely read.
1.9 ! foxr 1133: if($data == "close_connection_exit\n") {
! 1134: Log("CRITICAL",
! 1135: "Request Close Connection ... exiting");
! 1136: CloseAllLondConnections();
! 1137: exit;
! 1138: }
1.1 foxr 1139: Debug(8, "Complete transaction received: ".$data);
1.8 foxr 1140: my $Transaction = LondTransaction->new($data);
1.7 foxr 1141: $Transaction->SetClient($socket);
1142: QueueTransaction($Transaction);
1.1 foxr 1143: $watcher->cancel(); # Done looking for input data.
1144: }
1145:
1146: }
1147:
1148:
1149: =pod
1.3 albertel 1150:
1.1 foxr 1151: =head2 NewClient
1.3 albertel 1152:
1153: Callback that is called when a connection is received on the unix
1154: socket for a new client of lonc. The callback is parameterized by the
1155: event.. which is a-priori assumed to be an io event, and therefore has
1156: an fd member that is the Listener socket. We Accept the connection
1157: and register a new event on the readability of that socket:
1158:
1.1 foxr 1159: =cut
1.3 albertel 1160:
1.1 foxr 1161: sub NewClient {
1162: Debug(6, "NewClient");
1163: my $event = shift; # Get the event parameters.
1164: my $watcher = $event->w;
1165: my $socket = $watcher->fd; # Get the event' socket.
1166: my $connection = $socket->accept(); # Accept the client connection.
1167: Debug(8,"Connection request accepted from "
1168: .GetPeername($connection, AF_UNIX));
1169:
1170:
1171: my $description = sprintf("Connection to lonc client %d",
1172: $ClientConnection);
1173: Debug(9, "Creating event named: ".$description);
1174: Event->io(cb => \&ClientRequest,
1175: poll => 'r',
1176: desc => $description,
1177: data => "",
1178: fd => $connection);
1179: $ActiveClients{$connection} = $ClientConnection;
1180: $ClientConnection++;
1181: }
1.3 albertel 1182:
1183: =pod
1184:
1185: =head2 GetLoncSocketPath
1186:
1187: Returns the name of the UNIX socket on which to listen for client
1188: connections.
1.1 foxr 1189:
1190: =cut
1.3 albertel 1191:
1.1 foxr 1192: sub GetLoncSocketPath {
1193: return $UnixSocketDir."/".GetServerHost();
1194: }
1195:
1.3 albertel 1196: =pod
1197:
1198: =head2 GetServerHost
1199:
1200: Returns the host whose lond we talk with.
1201:
1.1 foxr 1202: =cut
1.3 albertel 1203:
1.7 foxr 1204: sub GetServerHost {
1.1 foxr 1205: return $RemoteHost; # Setup by the fork.
1206: }
1.3 albertel 1207:
1208: =pod
1209:
1210: =head2 GetServerPort
1211:
1212: Returns the lond port number.
1213:
1.1 foxr 1214: =cut
1.3 albertel 1215:
1.7 foxr 1216: sub GetServerPort {
1.1 foxr 1217: return $perlvar{londPort};
1218: }
1.3 albertel 1219:
1220: =pod
1221:
1222: =head2 SetupLoncListener
1223:
1224: Setup a lonc listener event. The event is called when the socket
1225: becomes readable.. that corresponds to the receipt of a new
1226: connection. The event handler established will accept the connection
1227: (creating a communcations channel), that int turn will establish
1228: another event handler to subess requests.
1.1 foxr 1229:
1230: =cut
1.3 albertel 1231:
1.1 foxr 1232: sub SetupLoncListener {
1233:
1234: my $socket;
1235: my $SocketName = GetLoncSocketPath();
1236: unlink($SocketName);
1.7 foxr 1237: unless ($socket =IO::Socket::UNIX->new(Local => $SocketName,
1.1 foxr 1238: Listen => 10,
1239: Type => SOCK_STREAM)) {
1240: die "Failed to create a lonc listner socket";
1241: }
1242: Event->io(cb => \&NewClient,
1243: poll => 'r',
1244: desc => 'Lonc listener Unix Socket',
1245: fd => $socket);
1246: }
1247:
1248: =pod
1.3 albertel 1249:
1.1 foxr 1250: =head2 ChildProcess
1251:
1252: This sub implements a child process for a single lonc daemon.
1253:
1254: =cut
1255:
1256: sub ChildProcess {
1257:
1258:
1259: # For now turn off signals.
1260:
1261: $SIG{QUIT} = IGNORE;
1262: $SIG{HUP} = IGNORE;
1263: $SIG{USR1} = IGNORE;
1264: $SIG{INT} = IGNORE;
1265: $SIG{CHLD} = IGNORE;
1266: $SIG{__DIE__} = IGNORE;
1267:
1268: SetupTimer();
1269:
1270: SetupLoncListener();
1271:
1272: $Event::Debuglevel = $DebugLevel;
1273:
1274: Debug(9, "Making initial lond connection for ".$RemoteHost);
1275:
1276: # Setup the initial server connection:
1277:
1278: &MakeLondConnection();
1.5 foxr 1279:
1280: if($ConnectionCount == 0) {
1281: Debug(1,"Could not make initial connection..\n");
1282: Debug(1,"Will retry when there's work to do\n");
1283: }
1.1 foxr 1284: Debug(9,"Entering event loop");
1285: my $ret = Event::loop(); # Start the main event loop.
1286:
1287:
1288: die "Main event loop exited!!!";
1289: }
1290:
1291: # Create a new child for host passed in:
1292:
1293: sub CreateChild {
1294: my $host = shift;
1295: $RemoteHost = $host;
1.9 ! foxr 1296: Log("CRITICAL", "Forking server for ".$host);
1.1 foxr 1297: $pid = fork;
1298: if($pid) { # Parent
1299: $ChildHash{$pid} = $RemoteHost;
1300: } else { # child.
1.5 foxr 1301: ShowStatus("Connected to ".$RemoteHost);
1.1 foxr 1302: ChildProcess;
1303: }
1304:
1305: }
1306: #
1307: # Parent process logic pass 1:
1308: # For each entry in the hosts table, we will
1309: # fork off an instance of ChildProcess to service the transactions
1310: # to that host. Each pid will be entered in a global hash
1311: # with the value of the key, the host.
1312: # The parent will then enter a loop to wait for process exits.
1313: # Each exit gets logged and the child gets restarted.
1314: #
1315:
1.5 foxr 1316: #
1317: # Fork and start in new session so hang-up isn't going to
1318: # happen without intent.
1319: #
1320:
1321:
1.6 foxr 1322:
1323:
1.8 foxr 1324:
1.6 foxr 1325:
1326: ShowStatus("Forming new session");
1327: my $childpid = fork;
1328: if ($childpid != 0) {
1329: sleep 4; # Give child a chacne to break to
1330: exit 0; # a new sesion.
1331: }
1.8 foxr 1332: #
1333: # Write my pid into the pid file so I can be located
1334: #
1335:
1336: ShowStatus("Parent writing pid file:");
1337: $execdir = $perlvar{'lonDaemons'};
1338: open (PIDSAVE, ">$execdir/logs/lonc.pid");
1339: print PIDSAVE "$$\n";
1340: close(PIDSAVE);
1.6 foxr 1341:
1342: if (POSIX::setsid() < 0) {
1343: print "Could not create new session\n";
1344: exit -1;
1345: }
1.5 foxr 1346:
1347: ShowStatus("Forking node servers");
1348:
1.9 ! foxr 1349: Log("CRITICAL", "--------------- Starting children ---------------");
! 1350:
1.1 foxr 1351: my $HostIterator = LondConnection::GetHostIterator;
1352: while (! $HostIterator->end()) {
1353:
1354: $hostentryref = $HostIterator->get();
1355: CreateChild($hostentryref->[0]);
1356: $HostIterator->next();
1357: }
1358:
1359: # Maintain the population:
1.5 foxr 1360:
1361: ShowStatus("Parent keeping the flock");
1.1 foxr 1362:
1363: while(1) {
1364: $deadchild = wait();
1365: if(exists $ChildHash{$deadchild}) { # need to restart.
1366: $deadhost = $ChildHash{$deadchild};
1367: delete($ChildHash{$deadchild});
1.9 ! foxr 1368: Log("WARNING","Lost child pid= ".$deadchild.
1.1 foxr 1369: "Connected to host ".$deadhost);
1.9 ! foxr 1370: Log("INFO", "Restarting child procesing ".$deadhost);
1.1 foxr 1371: CreateChild($deadhost);
1372: }
1373: }
1374:
1375: =head1 Theory
1.3 albertel 1376:
1377: The event class is used to build this as a single process with an
1378: event driven model. The following events are handled:
1.1 foxr 1379:
1380: =item UNIX Socket connection Received
1381:
1382: =item Request data arrives on UNIX data transfer socket.
1383:
1384: =item lond connection becomes writable.
1385:
1386: =item timer fires at 1 second intervals.
1387:
1388: All sockets are run in non-blocking mode. Timeouts managed by the timer
1389: handler prevents hung connections.
1390:
1391: Key data structures:
1392:
1.3 albertel 1393: =item RequestQueue
1394:
1395: A queue of requests received from UNIX sockets that are
1396: waiting for a chance to be forwarded on a lond connection socket.
1397:
1398: =item ActiveConnections
1399:
1400: A hash of lond connections that have transactions in process that are
1401: available to be timed out.
1402:
1403: =item ActiveTransactions
1404:
1405: A hash indexed by lond connections that contain the client reply
1406: socket for each connection that has an active transaction on it.
1407:
1408: =item IdleConnections
1409:
1410: A hash of lond connections that have no work to do. These connections
1411: can be closed if they are idle for a long enough time.
1.1 foxr 1412:
1413: =cut
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