Annotation of loncom/loncnew, revision 1.109
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: #
1.109 ! raeburn 5: # $Id: loncnew,v 1.108 2018/12/14 02:05:38 raeburn 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).
1.17 foxr 10: ## LON-CAPA is free software; you can redistribute it and/or modify
1.2 albertel 11: # it under the terms of the GNU General Public License as published by
12: # the Free Software Foundation; either version 2 of the License, or
13: # (at your option) any later version.
14: #
15: # LON-CAPA is distributed in the hope that it will be useful,
16: # but WITHOUT ANY WARRANTY; without even the implied warranty of
17: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18: # GNU General Public License for more details.
19: #
20: # You should have received a copy of the GNU General Public License
21: # along with LON-CAPA; if not, write to the Free Software
22: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23: #
24: # /home/httpd/html/adm/gpl.txt
25: #
26: # http://www.lon-capa.org/
27: #
1.1 foxr 28: #
1.97 raeburn 29: # new lonc handles n request out over m connections to londs.
1.1 foxr 30: # This module is based on the Event class.
31: # Development iterations:
32: # - Setup basic event loop. (done)
33: # - Add timer dispatch. (done)
34: # - Add ability to accept lonc UNIX domain sockets. (done)
35: # - Add ability to create/negotiate lond connections (done).
1.7 foxr 36: # - Add general logic for dispatching requests and timeouts. (done).
37: # - Add support for the lonc/lond requests. (done).
1.38 foxr 38: # - Add logging/status monitoring. (done)
39: # - Add Signal handling - HUP restarts. USR1 status report. (done)
1.7 foxr 40: # - Add Configuration file I/O (done).
1.38 foxr 41: # - Add management/status request interface. (done)
1.8 foxr 42: # - Add deferred request capability. (done)
1.38 foxr 43: # - Detect transmission timeouts. (done)
1.7 foxr 44: #
45:
1.23 foxr 46: use strict;
1.1 foxr 47: use lib "/home/httpd/lib/perl/";
48: use Event qw(:DEFAULT );
49: use POSIX qw(:signal_h);
1.12 foxr 50: use POSIX;
1.1 foxr 51: use IO::Socket;
52: use IO::Socket::INET;
53: use IO::Socket::UNIX;
1.9 foxr 54: use IO::File;
1.6 foxr 55: use IO::Handle;
1.1 foxr 56: use Socket;
57: use Crypt::IDEA;
58: use LONCAPA::Queue;
59: use LONCAPA::Stack;
60: use LONCAPA::LondConnection;
1.7 foxr 61: use LONCAPA::LondTransaction;
1.1 foxr 62: use LONCAPA::Configuration;
1.67 albertel 63: use Fcntl qw(:flock);
1.1 foxr 64:
65:
66: # Read the httpd configuration file to get perl variables
67: # normally set in apache modules:
68:
69: my $perlvarref = LONCAPA::Configuration::read_conf('loncapa.conf');
70: my %perlvar = %{$perlvarref};
71:
72: #
73: # parent and shared variables.
74:
1.83 albertel 75: my %ChildPid; # by pid -> host.
76: my %ChildHost; # by host.
1.105 raeburn 77: my %ChildKeyMode; # by pid -> keymode
1.62 foxr 78: my %listening_to; # Socket->host table for who the parent
79: # is listening to.
80: my %parent_dispatchers; # host-> listener watcher events.
1.1 foxr 81:
1.65 foxr 82: my %parent_handlers; # Parent signal handlers...
83:
1.9 foxr 84: my $MaxConnectionCount = 10; # Will get from config later.
1.1 foxr 85: my $ClientConnection = 0; # Uniquifier for client events.
86:
1.9 foxr 87: my $DebugLevel = 0;
1.29 foxr 88: my $NextDebugLevel= 2; # So Sigint can toggle this.
1.94 foxr 89: my $IdleTimeout= 5*60; # Seconds to wait prior to pruning connections.
1.1 foxr 90:
1.39 foxr 91: my $LogTransactions = 0; # When True, all transactions/replies get logged.
1.65 foxr 92: my $executable = $0; # Get the full path to me.
1.39 foxr 93:
1.1 foxr 94: #
95: # The variables below are only used by the child processes.
96: #
1.107 raeburn 97: my $RemoteHost; # Hostname of host child is talking to.
98: my $RemoteHostId; # lonid of host child is talking to.
99: my $RemoteDefHostId; # default lonhostID of host child is talking to.
1.108 raeburn 100: my $RemoteLoncapaRev; # LON-CAPA version of host child is talking to.
1.82 albertel 101: my @all_host_ids;
1.20 albertel 102: my $UnixSocketDir= $perlvar{'lonSockDir'};
1.1 foxr 103: my $IdleConnections = Stack->new(); # Set of idle connections
104: my %ActiveConnections; # Connections to the remote lond.
1.7 foxr 105: my %ActiveTransactions; # LondTransactions in flight.
1.1 foxr 106: my %ActiveClients; # Serial numbers of active clients by socket.
107: my $WorkQueue = Queue->new(); # Queue of pending transactions.
108: my $ConnectionCount = 0;
1.4 foxr 109: my $IdleSeconds = 0; # Number of seconds idle.
1.9 foxr 110: my $Status = ""; # Current status string.
1.14 foxr 111: my $RecentLogEntry = "";
1.72 albertel 112: my $ConnectionRetries=5; # Number of connection retries allowed.
113: my $ConnectionRetriesLeft=5; # Number of connection retries remaining.
1.40 foxr 114: my $LondVersion = "unknown"; # Version of lond we talk with.
1.49 foxr 115: my $KeyMode = ""; # e.g. ssl, local, insecure from last connect.
1.54 foxr 116: my $LondConnecting = 0; # True when a connection is being built.
1.1 foxr 117:
1.60 foxr 118:
119:
1.62 foxr 120: my $I_am_child = 0; # True if this is the child process.
1.57 foxr 121:
1.1 foxr 122: #
1.9 foxr 123: # The hash below gives the HTML format for log messages
124: # given a severity.
125: #
126: my %LogFormats;
127:
1.45 albertel 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>";
1.9 foxr 132: $LogFormats{"DEFAULT"} = " %s ";
133:
1.10 foxr 134:
1.57 foxr 135: # UpdateStatus;
136: # Update the idle status display to show how many connections
137: # are left, retries and other stuff.
138: #
139: sub UpdateStatus {
140: if ($ConnectionRetriesLeft > 0) {
141: ShowStatus(GetServerHost()." Connection count: ".$ConnectionCount
142: ." Retries remaining: ".$ConnectionRetriesLeft
143: ." ($KeyMode)");
144: } else {
145: ShowStatus(GetServerHost()." >> DEAD <<");
146: }
147: }
148:
1.10 foxr 149:
150: =pod
151:
152: =head2 LogPerm
153:
154: Makes an entry into the permanent log file.
155:
156: =cut
1.69 matthew 157:
1.10 foxr 158: sub LogPerm {
159: my $message=shift;
160: my $execdir=$perlvar{'lonDaemons'};
161: my $now=time;
162: my $local=localtime($now);
163: my $fh=IO::File->new(">>$execdir/logs/lonnet.perm.log");
1.86 albertel 164: chomp($message);
1.10 foxr 165: print $fh "$now:$message:$local\n";
166: }
1.9 foxr 167:
168: =pod
169:
170: =head2 Log
171:
172: Logs a message to the log file.
173: Parameters:
174:
175: =item severity
176:
177: One of CRITICAL, WARNING, INFO, SUCCESS used to select the
178: format string used to format the message. if the severity is
179: not a defined severity the Default format string is used.
180:
181: =item message
182:
183: The base message. In addtion to the format string, the message
184: will be appended to a string containing the name of our remote
185: host and the time will be formatted into the message.
186:
187: =cut
188:
189: sub Log {
1.47 foxr 190:
191: my ($severity, $message) = @_;
192:
1.9 foxr 193: if(!$LogFormats{$severity}) {
194: $severity = "DEFAULT";
195: }
196:
197: my $format = $LogFormats{$severity};
198:
199: # Put the window dressing in in front of the message format:
200:
201: my $now = time;
202: my $local = localtime($now);
203: my $finalformat = "$local ($$) [$RemoteHost] [$Status] ";
1.76 albertel 204: $finalformat = $finalformat.$format."\n";
1.9 foxr 205:
206: # open the file and put the result.
207:
208: my $execdir = $perlvar{'lonDaemons'};
209: my $fh = IO::File->new(">>$execdir/logs/lonc.log");
210: my $msg = sprintf($finalformat, $message);
1.14 foxr 211: $RecentLogEntry = $msg;
1.9 foxr 212: print $fh $msg;
213:
1.10 foxr 214:
1.9 foxr 215: }
1.6 foxr 216:
1.3 albertel 217:
1.1 foxr 218: =pod
1.3 albertel 219:
220: =head2 GetPeerName
221:
222: Returns the name of the host that a socket object is connected to.
223:
1.1 foxr 224: =cut
225:
226: sub GetPeername {
1.47 foxr 227:
228:
229: my ($connection, $AdrFamily) = @_;
230:
1.1 foxr 231: my $peer = $connection->peername();
232: my $peerport;
233: my $peerip;
234: if($AdrFamily == AF_INET) {
235: ($peerport, $peerip) = sockaddr_in($peer);
1.23 foxr 236: my $peername = gethostbyaddr($peerip, $AdrFamily);
1.1 foxr 237: return $peername;
238: } elsif ($AdrFamily == AF_UNIX) {
239: my $peerfile;
240: ($peerfile) = sockaddr_un($peer);
241: return $peerfile;
242: }
243: }
244: =pod
1.3 albertel 245:
1.1 foxr 246: =head2 Debug
1.3 albertel 247:
248: Invoked to issue a debug message.
249:
1.1 foxr 250: =cut
1.3 albertel 251:
1.1 foxr 252: sub Debug {
1.47 foxr 253:
254: my ($level, $message) = @_;
255:
1.1 foxr 256: if ($level <= $DebugLevel) {
1.23 foxr 257: Log("INFO", "-Debug- $message host = $RemoteHost");
1.1 foxr 258: }
259: }
260:
261: sub SocketDump {
1.47 foxr 262:
263: my ($level, $socket) = @_;
264:
1.1 foxr 265: if($level <= $DebugLevel) {
1.48 foxr 266: $socket->Dump(-1); # Ensure it will get dumped.
1.1 foxr 267: }
268: }
1.3 albertel 269:
1.1 foxr 270: =pod
1.3 albertel 271:
1.5 foxr 272: =head2 ShowStatus
273:
274: Place some text as our pid status.
1.10 foxr 275: and as what we return in a SIGUSR1
1.5 foxr 276:
277: =cut
1.69 matthew 278:
1.5 foxr 279: sub ShowStatus {
1.10 foxr 280: my $state = shift;
281: my $now = time;
282: my $local = localtime($now);
283: $Status = $local.": ".$state;
284: $0='lonc: '.$state.' '.$local;
1.5 foxr 285: }
286:
287: =pod
288:
1.69 matthew 289: =head2 SocketTimeout
1.15 foxr 290:
291: Called when an action on the socket times out. The socket is
292: destroyed and any active transaction is failed.
293:
294:
295: =cut
1.69 matthew 296:
1.15 foxr 297: sub SocketTimeout {
298: my $Socket = shift;
1.38 foxr 299: Log("WARNING", "A socket timeout was detected");
1.52 foxr 300: Debug(5, " SocketTimeout called: ");
1.48 foxr 301: $Socket->Dump(0);
1.42 foxr 302: if(exists($ActiveTransactions{$Socket})) {
1.43 albertel 303: FailTransaction($ActiveTransactions{$Socket});
1.42 foxr 304: }
1.22 foxr 305: KillSocket($Socket); # A transaction timeout also counts as
306: # a connection failure:
307: $ConnectionRetriesLeft--;
1.42 foxr 308: if($ConnectionRetriesLeft <= 0) {
1.52 foxr 309: Log("CRITICAL", "Host marked DEAD: ".GetServerHost());
1.56 foxr 310: $LondConnecting = 0;
1.42 foxr 311: }
312:
1.15 foxr 313: }
1.80 albertel 314:
1.64 foxr 315: #
316: # This function should be called by the child in all cases where it must
1.80 albertel 317: # exit. The child process must create a lock file for the AF_UNIX socket
318: # in order to prevent connection requests from lonnet in the time between
319: # process exit and the parent picking up the listen again.
320: #
1.64 foxr 321: # Parameters:
322: # exit_code - Exit status value, however see the next parameter.
323: # message - If this optional parameter is supplied, the exit
324: # is via a die with this message.
325: #
326: sub child_exit {
327: my ($exit_code, $message) = @_;
328:
329: # Regardless of how we exit, we may need to do the lock thing:
330:
1.80 albertel 331: #
332: # Create a lock file since there will be a time window
333: # between our exit and the parent's picking up the listen
334: # during which no listens will be done on the
335: # lonnet client socket.
336: #
337: my $lock_file = &GetLoncSocketPath().".lock";
338: open(LOCK,">$lock_file");
339: print LOCK "Contents not important";
340: close(LOCK);
1.81 albertel 341: unlink(&GetLoncSocketPath());
1.64 foxr 342:
1.80 albertel 343: if ($message) {
344: die($message);
1.64 foxr 345: } else {
346: exit($exit_code);
347: }
348: }
1.35 foxr 349: #----------------------------- Timer management ------------------------
1.15 foxr 350:
351: =pod
352:
1.1 foxr 353: =head2 Tick
1.3 albertel 354:
1.97 raeburn 355: Invoked each timer tick.
1.3 albertel 356:
1.1 foxr 357: =cut
358:
1.5 foxr 359:
1.1 foxr 360: sub Tick {
1.52 foxr 361: my ($Event) = @_;
362: my $clock_watcher = $Event->w;
363:
1.1 foxr 364: my $client;
1.57 foxr 365: UpdateStatus();
366:
1.4 foxr 367: # Is it time to prune connection count:
368:
369:
370: if($IdleConnections->Count() &&
371: ($WorkQueue->Count() == 0)) { # Idle connections and nothing to do?
1.52 foxr 372: $IdleSeconds++;
1.4 foxr 373: if($IdleSeconds > $IdleTimeout) { # Prune a connection...
1.23 foxr 374: my $Socket = $IdleConnections->pop();
1.6 foxr 375: KillSocket($Socket);
1.54 foxr 376: $IdleSeconds = 0; # Otherwise all connections get trimmed to fast.
1.57 foxr 377: UpdateStatus();
1.80 albertel 378: if(($ConnectionCount == 0)) {
1.64 foxr 379: &child_exit(0);
380:
1.57 foxr 381: }
1.4 foxr 382: }
383: } else {
384: $IdleSeconds = 0; # Reset idle count if not idle.
385: }
1.15 foxr 386: #
387: # For each inflight transaction, tick down its timeout counter.
388: #
1.35 foxr 389:
1.34 albertel 390: foreach my $item (keys %ActiveConnections) {
391: my $State = $ActiveConnections{$item}->data->GetState();
1.35 foxr 392: if ($State ne 'Idle') {
1.34 albertel 393: Debug(5,"Ticking Socket $State $item");
394: $ActiveConnections{$item}->data->Tick();
395: }
1.15 foxr 396: }
1.5 foxr 397: # Do we have work in the queue, but no connections to service them?
398: # If so, try to make some new connections to get things going again.
399: #
1.57 foxr 400: # Note this code is dead now...
401: #
1.5 foxr 402: my $Requests = $WorkQueue->Count();
1.56 foxr 403: if (($ConnectionCount == 0) && ($Requests > 0) && (!$LondConnecting)) {
1.10 foxr 404: if ($ConnectionRetriesLeft > 0) {
1.56 foxr 405: Debug(5,"Work but no connections, Make a new one");
406: my $success;
407: $success = &MakeLondConnection;
408: if($success == 0) { # All connections failed:
1.29 foxr 409: Debug(5,"Work in queue failed to make any connectiouns\n");
1.22 foxr 410: EmptyQueue(); # Fail pending transactions with con_lost.
1.42 foxr 411: CloseAllLondConnections(); # Should all be closed but....
1.10 foxr 412: }
413: } else {
1.56 foxr 414: $LondConnecting = 0;
1.22 foxr 415: ShowStatus(GetServerHost()." >>> DEAD!!! <<<");
1.29 foxr 416: Debug(5,"Work in queue, but gave up on connections..flushing\n");
1.10 foxr 417: EmptyQueue(); # Connections can't be established.
1.42 foxr 418: CloseAllLondConnections(); # Should all already be closed but...
1.5 foxr 419: }
420:
421: }
1.49 foxr 422: if ($ConnectionCount == 0) {
423: $KeyMode = "";
1.52 foxr 424: $clock_watcher->cancel();
1.49 foxr 425: }
1.66 albertel 426: &UpdateStatus();
1.1 foxr 427: }
428:
429: =pod
1.3 albertel 430:
1.1 foxr 431: =head2 SetupTimer
432:
1.3 albertel 433: Sets up a 1 per sec recurring timer event. The event handler is used to:
1.1 foxr 434:
1.3 albertel 435: =item
436:
437: Trigger timeouts on communications along active sockets.
438:
439: =item
440:
441: Trigger disconnections of idle sockets.
1.1 foxr 442:
443: =cut
444:
445: sub SetupTimer {
1.52 foxr 446: Debug(6, "SetupTimer");
1.92 foxr 447: Event->timer(interval => 1, cb => \&Tick,
448: hard => 1);
1.1 foxr 449: }
1.3 albertel 450:
1.1 foxr 451: =pod
1.3 albertel 452:
1.1 foxr 453: =head2 ServerToIdle
1.3 albertel 454:
455: This function is called when a connection to the server is
456: ready for more work.
457:
458: If there is work in the Work queue the top element is dequeued
1.1 foxr 459: and the connection will start to work on it. If the work queue is
460: empty, the connection is pushed on the idle connection stack where
461: it will either get another work unit, or alternatively, if it sits there
462: long enough, it will be shut down and released.
463:
1.3 albertel 464: =cut
1.1 foxr 465:
466: sub ServerToIdle {
467: my $Socket = shift; # Get the socket.
1.49 foxr 468: $KeyMode = $Socket->{AuthenticationMode};
1.7 foxr 469: delete($ActiveTransactions{$Socket}); # Server has no transaction
1.1 foxr 470:
1.29 foxr 471: &Debug(5, "Server to idle");
1.1 foxr 472:
473: # If there's work to do, start the transaction:
474:
1.23 foxr 475: my $reqdata = $WorkQueue->dequeue(); # This is a LondTransaction
1.29 foxr 476: if ($reqdata ne undef) {
477: Debug(5, "Queue gave request data: ".$reqdata->getRequest());
1.7 foxr 478: &StartRequest($Socket, $reqdata);
1.8 foxr 479:
1.1 foxr 480: } else {
481:
482: # There's no work waiting, so push the server to idle list.
1.29 foxr 483: &Debug(5, "No new work requests, server connection going idle");
1.1 foxr 484: $IdleConnections->push($Socket);
485: }
486: }
1.3 albertel 487:
1.1 foxr 488: =pod
1.3 albertel 489:
1.1 foxr 490: =head2 ClientWritable
1.3 albertel 491:
492: Event callback for when a client socket is writable.
493:
1.97 raeburn 494: This callback is established when a transaction response is
495: available from lond. The response is forwarded to the unix socket
1.3 albertel 496: as it becomes writable in this sub.
497:
1.1 foxr 498: Parameters:
499:
1.3 albertel 500: =item Event
501:
502: The event that has been triggered. Event->w->data is
503: the data and Event->w->fd is the socket to write.
1.1 foxr 504:
505: =cut
1.3 albertel 506:
1.1 foxr 507: sub ClientWritable {
508: my $Event = shift;
509: my $Watcher = $Event->w;
1.84 albertel 510: if (!defined($Watcher)) {
511: &child_exit(-1,'No watcher for event in ClientWritable');
512: }
1.1 foxr 513: my $Data = $Watcher->data;
514: my $Socket = $Watcher->fd;
515:
516: # Try to send the data:
517:
518: &Debug(6, "ClientWritable writing".$Data);
519: &Debug(9, "Socket is: ".$Socket);
520:
1.6 foxr 521: if($Socket->connected) {
522: my $result = $Socket->send($Data, 0);
523:
524: # $result undefined: the write failed.
525: # otherwise $result is the number of bytes written.
526: # Remove that preceding string from the data.
527: # If the resulting data is empty, destroy the watcher
528: # and set up a read event handler to accept the next
529: # request.
530:
531: &Debug(9,"Send result is ".$result." Defined: ".defined($result));
1.29 foxr 532: if($result ne undef) {
1.6 foxr 533: &Debug(9, "send result was defined");
534: if($result == length($Data)) { # Entire string sent.
535: &Debug(9, "ClientWritable data all written");
536: $Watcher->cancel();
537: #
538: # Set up to read next request from socket:
539:
540: my $descr = sprintf("Connection to lonc client %d",
541: $ActiveClients{$Socket});
542: Event->io(cb => \&ClientRequest,
543: poll => 'r',
544: desc => $descr,
545: data => "",
546: fd => $Socket);
547:
548: } else { # Partial string sent.
549: $Watcher->data(substr($Data, $result));
1.15 foxr 550: if($result == 0) { # client hung up on us!!
1.52 foxr 551: # Log("INFO", "lonc pipe client hung up on us!");
1.15 foxr 552: $Watcher->cancel;
553: $Socket->shutdown(2);
554: $Socket->close();
555: }
1.6 foxr 556: }
557:
558: } else { # Error of some sort...
559:
560: # Some errnos are possible:
561: my $errno = $!;
562: if($errno == POSIX::EWOULDBLOCK ||
563: $errno == POSIX::EAGAIN ||
564: $errno == POSIX::EINTR) {
1.96 foxr 565: # No action taken...the socket will be writable firing the event again
566: # which will result in a retry of the write.
1.6 foxr 567: } else { # Unanticipated errno.
568: &Debug(5,"ClientWritable error or peer shutdown".$RemoteHost);
569: $Watcher->cancel; # Stop the watcher.
570: $Socket->shutdown(2); # Kill connection
571: $Socket->close(); # Close the socket.
572: }
1.1 foxr 573:
574: }
1.6 foxr 575: } else {
576: $Watcher->cancel(); # A delayed request...just cancel.
1.84 albertel 577: return;
1.1 foxr 578: }
579: }
580:
581: =pod
1.3 albertel 582:
1.1 foxr 583: =head2 CompleteTransaction
1.3 albertel 584:
585: Called when the reply data has been received for a lond
1.1 foxr 586: transaction. The reply data must now be sent to the
587: ultimate client on the other end of the Unix socket. This is
588: done by setting up a writable event for the socket with the
589: data the reply data.
1.3 albertel 590:
1.1 foxr 591: Parameters:
1.3 albertel 592:
593: =item Socket
594:
1.97 raeburn 595: Socket on which the lond transaction occurred. This is a
596: LondConnection. The data received are in the TransactionReply member.
1.3 albertel 597:
1.7 foxr 598: =item Transaction
1.3 albertel 599:
1.7 foxr 600: The transaction that is being completed.
1.1 foxr 601:
602: =cut
1.3 albertel 603:
1.1 foxr 604: sub CompleteTransaction {
1.29 foxr 605: &Debug(5,"Complete transaction");
1.47 foxr 606:
607: my ($Socket, $Transaction) = @_;
1.1 foxr 608:
1.7 foxr 609: if (!$Transaction->isDeferred()) { # Normal transaction
610: my $data = $Socket->GetReply(); # Data to send.
1.39 foxr 611: if($LogTransactions) {
612: Log("SUCCESS", "Reply from lond: '$data'");
613: }
1.7 foxr 614: StartClientReply($Transaction, $data);
615: } else { # Delete deferred transaction file.
1.9 foxr 616: Log("SUCCESS", "A delayed transaction was completed");
1.109 ! raeburn 617: LogPerm("S:".$Transaction->getClient().":".$Transaction->getRequest());
1.86 albertel 618: unlink($Transaction->getFile());
1.7 foxr 619: }
1.6 foxr 620: }
1.42 foxr 621:
1.6 foxr 622: =pod
1.42 foxr 623:
1.6 foxr 624: =head1 StartClientReply
625:
626: Initiates a reply to a client where the reply data is a parameter.
627:
1.7 foxr 628: =head2 parameters:
629:
630: =item Transaction
631:
632: The transaction for which we are responding to the client.
633:
634: =item data
635:
1.97 raeburn 636: The data to send to apache client.
1.7 foxr 637:
1.6 foxr 638: =cut
1.42 foxr 639:
1.6 foxr 640: sub StartClientReply {
1.1 foxr 641:
1.47 foxr 642: my ($Transaction, $data) = @_;
1.12 foxr 643:
1.7 foxr 644: my $Client = $Transaction->getClient();
645:
1.1 foxr 646: &Debug(8," Reply was: ".$data);
647: my $Serial = $ActiveClients{$Client};
648: my $desc = sprintf("Connection to lonc client %d",
649: $Serial);
650: Event->io(fd => $Client,
651: poll => "w",
652: desc => $desc,
653: cb => \&ClientWritable,
654: data => $data);
655: }
1.42 foxr 656:
1.4 foxr 657: =pod
1.42 foxr 658:
1.4 foxr 659: =head2 FailTransaction
660:
661: Finishes a transaction with failure because the associated lond socket
1.7 foxr 662: disconnected. There are two possibilities:
663: - The transaction is deferred: in which case we just quietly
664: delete the transaction since there is no client connection.
665: - The transaction is 'live' in which case we initiate the sending
666: of "con_lost" to the client.
667:
1.42 foxr 668: Deleting the transaction means killing it from the %ActiveTransactions hash.
1.4 foxr 669:
670: Parameters:
671:
672: =item client
673:
1.7 foxr 674: The LondTransaction we are failing.
1.42 foxr 675:
1.4 foxr 676: =cut
677:
678: sub FailTransaction {
1.7 foxr 679: my $transaction = shift;
1.52 foxr 680:
681: # If the socket is dead, that's already logged.
682:
683: if ($ConnectionRetriesLeft > 0) {
684: Log("WARNING", "Failing transaction "
1.71 albertel 685: .$transaction->getLoggableRequest());
1.52 foxr 686: }
1.71 albertel 687: Debug(1, "Failing transaction: ".$transaction->getLoggableRequest());
1.10 foxr 688: if (!$transaction->isDeferred()) { # If the transaction is deferred we'll get to it.
1.11 foxr 689: my $client = $transaction->getClient();
1.30 foxr 690: Debug(1," Replying con_lost to ".$transaction->getRequest());
1.11 foxr 691: StartClientReply($transaction, "con_lost\n");
1.7 foxr 692: }
1.4 foxr 693:
694: }
695:
696: =pod
1.69 matthew 697:
1.6 foxr 698: =head1 EmptyQueue
1.7 foxr 699:
1.6 foxr 700: Fails all items in the work queue with con_lost.
1.7 foxr 701: Note that each item in the work queue is a transaction.
702:
1.6 foxr 703: =cut
1.69 matthew 704:
1.6 foxr 705: sub EmptyQueue {
1.22 foxr 706: $ConnectionRetriesLeft--; # Counts as connection failure too.
1.6 foxr 707: while($WorkQueue->Count()) {
1.10 foxr 708: my $request = $WorkQueue->dequeue(); # This is a transaction
1.7 foxr 709: FailTransaction($request);
1.6 foxr 710: }
711: }
712:
713: =pod
1.4 foxr 714:
1.9 foxr 715: =head2 CloseAllLondConnections
716:
717: Close all connections open on lond prior to exit e.g.
718:
719: =cut
1.69 matthew 720:
1.9 foxr 721: sub CloseAllLondConnections {
1.23 foxr 722: foreach my $Socket (keys %ActiveConnections) {
1.42 foxr 723: if(exists($ActiveTransactions{$Socket})) {
724: FailTransaction($ActiveTransactions{$Socket});
725: }
726: KillSocket($Socket);
1.9 foxr 727: }
728: }
729:
730: =pod
731:
1.4 foxr 732: =head2 KillSocket
733:
734: Destroys a socket. This function can be called either when a socket
735: has died of 'natural' causes or because a socket needs to be pruned due to
736: idleness. If the socket has died naturally, if there are no longer any
737: live connections a new connection is created (in case there are transactions
738: in the queue). If the socket has been pruned, it is never re-created.
739:
740: Parameters:
1.1 foxr 741:
1.4 foxr 742: =item Socket
743:
744: The socket to kill off.
745:
1.105 raeburn 746: =item restart
1.4 foxr 747:
1.97 raeburn 748: non-zero if we are allowed to create a new connection.
1.4 foxr 749:
1.69 matthew 750: =cut
1.4 foxr 751:
752: sub KillSocket {
753: my $Socket = shift;
1.105 raeburn 754: my $restart = shift;
1.4 foxr 755:
1.17 foxr 756: Log("WARNING", "Shutting down a socket");
1.9 foxr 757: $Socket->Shutdown();
758:
1.7 foxr 759: # If the socket came from the active connection set,
760: # delete its transaction... note that FailTransaction should
761: # already have been called!!!
762: # otherwise it came from the idle set.
763: #
1.4 foxr 764:
765: if(exists($ActiveTransactions{$Socket})) {
766: delete ($ActiveTransactions{$Socket});
767: }
768: if(exists($ActiveConnections{$Socket})) {
1.90 foxr 769: $ActiveConnections{$Socket}->cancel;
1.4 foxr 770: delete($ActiveConnections{$Socket});
1.105 raeburn 771: # Decrement ConnectionCount unless we will immediately
772: # re-connect (i.e., $restart is true), because this was
773: # a connection where the SSL channel for exchange of the
774: # shared key failed, and we may use an insecure channel.
775: unless ($restart) {
776: $ConnectionCount--;
777: }
1.37 albertel 778: if ($ConnectionCount < 0) { $ConnectionCount = 0; }
1.4 foxr 779: }
1.6 foxr 780: # If the connection count has gone to zero and there is work in the
781: # work queue, the work all gets failed with con_lost.
782: #
1.105 raeburn 783:
1.6 foxr 784: if($ConnectionCount == 0) {
1.98 foxr 785: $LondConnecting = 0; # No connections so also not connecting.
1.22 foxr 786: EmptyQueue();
1.105 raeburn 787: CloseAllLondConnections(); # Should all already be closed but...
788: &clear_childpid($$);
1.4 foxr 789: }
1.90 foxr 790: UpdateStatus();
1.4 foxr 791: }
1.1 foxr 792:
793: =pod
1.3 albertel 794:
1.1 foxr 795: =head2 LondReadable
1.3 albertel 796:
1.1 foxr 797: This function is called whenever a lond connection
798: is readable. The action is state dependent:
799:
1.3 albertel 800: =head3 State=Initialized
801:
1.100 raeburn 802: We are waiting for the challenge, this is a no-op until the
1.1 foxr 803: state changes.
1.3 albertel 804:
1.1 foxr 805: =head3 State=Challenged
1.3 albertel 806:
807: The challenge has arrived we need to transition to Writable.
1.1 foxr 808: The connection must echo the challenge back.
1.3 albertel 809:
1.1 foxr 810: =head3 State=ChallengeReplied
1.3 albertel 811:
1.97 raeburn 812: The challenge has been replied to. Then we are receiving the
1.1 foxr 813: 'ok' from the partner.
1.3 albertel 814:
1.40 foxr 815: =head3 State=ReadingVersionString
816:
817: We have requested the lond version and are reading the
818: version back. Upon completion, we'll store the version away
819: for future use(?).
820:
821: =head3 State=HostSet
822:
823: We have selected the domain name of our peer (multhomed hosts)
824: and are getting the reply (presumably ok) back.
825:
1.1 foxr 826: =head3 State=RequestingKey
1.3 albertel 827:
828: The ok has been received and we need to send the request for
1.1 foxr 829: an encryption key. Transition to writable for that.
1.3 albertel 830:
1.1 foxr 831: =head3 State=ReceivingKey
1.3 albertel 832:
833: The the key has been requested, now we are reading the new key.
834:
1.1 foxr 835: =head3 State=Idle
1.3 albertel 836:
837: The encryption key has been negotiated or we have finished
1.97 raeburn 838: reading data from the a transaction. If the callback data have
1.99 raeburn 839: a client as well as the socket information, then we are
1.97 raeburn 840: doing a transaction and the data received are relayed to the client
1.1 foxr 841: before the socket is put on the idle list.
1.3 albertel 842:
1.1 foxr 843: =head3 State=SendingRequest
1.3 albertel 844:
845: I do not think this state can be received here, but if it is,
1.1 foxr 846: the appropriate thing to do is to transition to writable, and send
847: the request.
1.3 albertel 848:
1.1 foxr 849: =head3 State=ReceivingReply
1.3 albertel 850:
851: We finished sending the request to the server and now transition
1.1 foxr 852: to readable to receive the reply.
853:
854: The parameter to this function are:
1.3 albertel 855:
1.1 foxr 856: The event. Implicit in this is the watcher and its data. The data
1.97 raeburn 857: contain at least the lond connection object and, if a
1.1 foxr 858: transaction is in progress, the socket attached to the local client.
859:
1.3 albertel 860: =cut
1.1 foxr 861:
862: sub LondReadable {
1.8 foxr 863:
1.41 albertel 864: my $Event = shift;
865: my $Watcher = $Event->w;
866: my $Socket = $Watcher->data;
867: my $client = undef;
1.40 foxr 868:
1.41 albertel 869: &Debug(6,"LondReadable called state = ".$Socket->GetState());
1.40 foxr 870:
871:
1.41 albertel 872: my $State = $Socket->GetState(); # All action depends on the state.
1.40 foxr 873:
1.41 albertel 874: SocketDump(6, $Socket);
875: my $status = $Socket->Readable();
1.40 foxr 876:
1.41 albertel 877: &Debug(2, "Socket->Readable returned: $status");
1.40 foxr 878:
1.41 albertel 879: if($status != 0) {
880: # bad return from socket read. Currently this means that
881: # The socket has become disconnected. We fail the transaction.
1.40 foxr 882:
1.41 albertel 883: Log("WARNING",
884: "Lond connection lost.");
1.105 raeburn 885: my $state_on_exit = $Socket->GetState();
1.41 albertel 886: if(exists($ActiveTransactions{$Socket})) {
887: FailTransaction($ActiveTransactions{$Socket});
1.56 foxr 888: } else {
889: # Socket is connecting and failed... need to mark
890: # no longer connecting.
891: $LondConnecting = 0;
1.41 albertel 892: }
893: $Watcher->cancel();
1.105 raeburn 894: if ($state_on_exit eq 'ReInitNoSSL') {
895: # SSL certificate verification failed, and insecure connection
896: # allowed. Send restart arg to KillSocket(), so EmptyQueue()
897: # is not called, as we still hope to process queued request.
898:
899: KillSocket($Socket,1);
900:
901: # Re-initiate creation of Lond Connection for use with queued
902: # request.
903:
904: ShowStatus("Connected to ".$RemoteHost);
905: Log("WARNING","No SSL channel (verification failed), will try with insecure channel");
906: &MakeLondConnection(1);
907:
908: } else {
909: KillSocket($Socket);
910: $ConnectionRetriesLeft--; # Counts as connection failure
911: }
1.41 albertel 912: return;
913: }
914: SocketDump(6,$Socket);
1.17 foxr 915:
1.41 albertel 916: $State = $Socket->GetState(); # Update in case of transition.
917: &Debug(6, "After read, state is ".$State);
1.1 foxr 918:
1.41 albertel 919: if($State eq "Initialized") {
1.1 foxr 920:
921:
1.105 raeburn 922: } elsif ($State eq "ReInitNoSSL") {
923:
1.41 albertel 924: } elsif ($State eq "ChallengeReceived") {
1.1 foxr 925: # The challenge must be echoed back; The state machine
926: # in the connection takes care of setting that up. Just
927: # need to transition to writable:
1.41 albertel 928:
929: $Watcher->cb(\&LondWritable);
930: $Watcher->poll("w");
1.1 foxr 931:
1.41 albertel 932: } elsif ($State eq "ChallengeReplied") {
1.1 foxr 933:
1.41 albertel 934: } elsif ($State eq "RequestingVersion") {
935: # Need to ask for the version... that is writiability:
1.1 foxr 936:
1.41 albertel 937: $Watcher->cb(\&LondWritable);
938: $Watcher->poll("w");
939:
940: } elsif ($State eq "ReadingVersionString") {
941: # Read the rest of the version string...
942: } elsif ($State eq "SetHost") {
943: # Need to request the actual domain get set...
944:
945: $Watcher->cb(\&LondWritable);
946: $Watcher->poll("w");
947: } elsif ($State eq "HostSet") {
948: # Reading the 'ok' from the peer.
949:
950: } elsif ($State eq "RequestingKey") {
1.1 foxr 951: # The ok was received. Now we need to request the key
952: # That requires us to be writable:
953:
1.41 albertel 954: $Watcher->cb(\&LondWritable);
955: $Watcher->poll("w");
1.1 foxr 956:
1.41 albertel 957: } elsif ($State eq "ReceivingKey") {
1.1 foxr 958:
1.41 albertel 959: } elsif ($State eq "Idle") {
1.105 raeburn 960:
961: if ($ConnectionCount == 1) {
962: # Write child Pid file to keep track of ssl and insecure
963: # connections
964:
965: &record_childpid($Socket);
966: }
967:
1.41 albertel 968: # This is as good a spot as any to get the peer version
969: # string:
1.40 foxr 970:
1.41 albertel 971: if($LondVersion eq "unknown") {
972: $LondVersion = $Socket->PeerVersion();
973: Log("INFO", "Connected to lond version: $LondVersion");
974: }
1.1 foxr 975: # If necessary, complete a transaction and then go into the
976: # idle queue.
1.22 foxr 977: # Note that a trasition to idle indicates a live lond
978: # on the other end so reset the connection retries.
979: #
1.41 albertel 980: $ConnectionRetriesLeft = $ConnectionRetries; # success resets the count
981: $Watcher->cancel();
982: if(exists($ActiveTransactions{$Socket})) {
983: Debug(5,"Completing transaction!!");
984: CompleteTransaction($Socket,
985: $ActiveTransactions{$Socket});
986: } else {
1.95 foxr 987: my $count = $Socket->GetClientData();
988: Log("SUCCESS", "Connection ".$count." to "
1.41 albertel 989: .$RemoteHost." now ready for action");
990: }
991: ServerToIdle($Socket); # Next work unit or idle.
1.54 foxr 992:
993: #
994: $LondConnecting = 0; # Best spot I can think of for this.
995: #
1.6 foxr 996:
1.41 albertel 997: } elsif ($State eq "SendingRequest") {
1.1 foxr 998: # We need to be writable for this and probably don't belong
999: # here inthe first place.
1000:
1.73 albertel 1001: Debug(6, "SendingRequest state encountered in readable");
1.41 albertel 1002: $Watcher->poll("w");
1003: $Watcher->cb(\&LondWritable);
1.1 foxr 1004:
1.41 albertel 1005: } elsif ($State eq "ReceivingReply") {
1.1 foxr 1006:
1007:
1.41 albertel 1008: } else {
1009: # Invalid state.
1010: Debug(4, "Invalid state in LondReadable");
1011: }
1.1 foxr 1012: }
1.3 albertel 1013:
1.1 foxr 1014: =pod
1.3 albertel 1015:
1.1 foxr 1016: =head2 LondWritable
1.3 albertel 1017:
1.1 foxr 1018: This function is called whenever a lond connection
1019: becomes writable while there is a writeable monitoring
1020: event. The action taken is very state dependent:
1.3 albertel 1021:
1.1 foxr 1022: =head3 State = Connected
1.3 albertel 1023:
1024: The connection is in the process of sending the 'init' hailing to the
1.100 raeburn 1025: lond on the remote end. The Writable member of the connection object
1026: is called. On error, call ConnectionError to destroy the connection
1027: and remove it from the ActiveConnections hash.
1.3 albertel 1028:
1.1 foxr 1029: =head3 Initialized
1.3 albertel 1030:
1031: 'init' has been sent, writability monitoring is removed and
1032: readability monitoring is started with LondReadable as the callback.
1033:
1.1 foxr 1034: =head3 ChallengeReceived
1.3 albertel 1035:
1036: The connection has received the who are you challenge from the remote
1037: system, and is in the process of sending the challenge
1038: response. Writable is called.
1039:
1.1 foxr 1040: =head3 ChallengeReplied
1.3 albertel 1041:
1042: The connection has replied to the initial challenge The we switch to
1043: monitoring readability looking for the server to reply with 'ok'.
1044:
1.1 foxr 1045: =head3 RequestingKey
1.3 albertel 1046:
1047: The connection is in the process of requesting its encryption key.
1048: Writable is called.
1049:
1.1 foxr 1050: =head3 ReceivingKey
1.3 albertel 1051:
1052: The connection has sent the request for a key. Switch to readability
1053: monitoring to accept the key
1054:
1.1 foxr 1055: =head3 SendingRequest
1.3 albertel 1056:
1057: The connection is in the process of sending a request to the server.
1058: This request is part of a client transaction. All the states until
1059: now represent the client setup protocol. Writable is called.
1060:
1.1 foxr 1061: =head3 ReceivingReply
1062:
1.3 albertel 1063: The connection has sent a request. Now it must receive a reply.
1064: Readability monitoring is requested.
1065:
1066: This function is an event handler and therefore receives as
1.1 foxr 1067: a parameter the event that has fired. The data for the watcher
1068: of this event is a reference to a list of one or two elements,
1069: depending on state. The first (and possibly only) element is the
1070: socket. The second (present only if a request is in progress)
1071: is the socket on which to return a reply to the caller.
1072:
1073: =cut
1.3 albertel 1074:
1.1 foxr 1075: sub LondWritable {
1076: my $Event = shift;
1077: my $Watcher = $Event->w;
1.8 foxr 1078: my $Socket = $Watcher->data;
1079: my $State = $Socket->GetState();
1.1 foxr 1080:
1.8 foxr 1081: Debug(6,"LondWritable State = ".$State."\n");
1.1 foxr 1082:
1.8 foxr 1083:
1.1 foxr 1084: # Figure out what to do depending on the state of the socket:
1085:
1086:
1087:
1088:
1089: SocketDump(6,$Socket);
1090:
1.42 foxr 1091: # If the socket is writable, we must always write.
1092: # Only by writing will we undergo state transitions.
1093: # Old logic wrote in state specific code below, however
1094: # That forces us at least through another invocation of
1095: # this function after writability is possible again.
1096: # This logic also factors out common code for handling
1097: # write failures... in all cases, write failures
1098: # Kill the socket.
1099: # This logic makes the branches of the >big< if below
1100: # so that the writing states are actually NO-OPs.
1101:
1102: if ($Socket->Writable() != 0) {
1.43 albertel 1103: # The write resulted in an error.
1104: # We'll treat this as if the socket got disconnected:
1105: Log("WARNING", "Connection to ".$RemoteHost.
1106: " has been disconnected");
1107: if(exists($ActiveTransactions{$Socket})) {
1108: FailTransaction($ActiveTransactions{$Socket});
1.56 foxr 1109: } else {
1110: # In the process of conneting, so need to turn that off.
1111:
1112: $LondConnecting = 0;
1.43 albertel 1113: }
1114: $Watcher->cancel();
1115: KillSocket($Socket);
1116: return;
1.42 foxr 1117: }
1118:
1119:
1120:
1.41 albertel 1121: if ($State eq "Connected") {
1.1 foxr 1122:
1.41 albertel 1123: # "init" is being sent...
1.42 foxr 1124:
1.41 albertel 1125: } elsif ($State eq "Initialized") {
1.4 foxr 1126:
1.41 albertel 1127: # Now that init was sent, we switch
1128: # to watching for readability:
1.1 foxr 1129:
1.41 albertel 1130: $Watcher->cb(\&LondReadable);
1131: $Watcher->poll("r");
1.105 raeburn 1132:
1133: } elsif ($State eq "ReInitNoSSL") {
1134:
1.41 albertel 1135: } elsif ($State eq "ChallengeReceived") {
1136: # We received the challenge, now we
1137: # are echoing it back. This is a no-op,
1138: # we're waiting for the state to change
1.1 foxr 1139:
1.41 albertel 1140: } elsif ($State eq "ChallengeReplied") {
1141: # The echo was sent back, so we switch
1142: # to watching readability.
1143:
1144: $Watcher->cb(\&LondReadable);
1145: $Watcher->poll("r");
1146: } elsif ($State eq "RequestingVersion") {
1147: # Sending the peer a version request...
1.42 foxr 1148:
1.41 albertel 1149: } elsif ($State eq "ReadingVersionString") {
1150: # Transition to read since we have sent the
1151: # version command and now just need to read the
1152: # version string from the peer:
1.40 foxr 1153:
1.41 albertel 1154: $Watcher->cb(\&LondReadable);
1155: $Watcher->poll("r");
1.40 foxr 1156:
1.41 albertel 1157: } elsif ($State eq "SetHost") {
1158: # Setting the remote domain...
1.42 foxr 1159:
1.41 albertel 1160: } elsif ($State eq "HostSet") {
1161: # Back to readable to get the ok.
1.40 foxr 1162:
1.41 albertel 1163: $Watcher->cb(\&LondReadable);
1164: $Watcher->poll("r");
1.40 foxr 1165:
1166:
1.41 albertel 1167: } elsif ($State eq "RequestingKey") {
1168: # At this time we're requesting the key.
1169: # again, this is essentially a no-op.
1170:
1171: } elsif ($State eq "ReceivingKey") {
1172: # Now we need to wait for the key
1173: # to come back from the peer:
1174:
1175: $Watcher->cb(\&LondReadable);
1176: $Watcher->poll("r");
1177:
1178: } elsif ($State eq "SendingRequest") {
1.40 foxr 1179:
1.41 albertel 1180: # At this time we are sending a request to the
1.1 foxr 1181: # peer... write the next chunk:
1182:
1.41 albertel 1183:
1184: } elsif ($State eq "ReceivingReply") {
1185: # The send has completed. Wait for the
1186: # data to come in for a reply.
1187: Debug(8,"Writable sent request/receiving reply");
1188: $Watcher->cb(\&LondReadable);
1189: $Watcher->poll("r");
1.1 foxr 1190:
1.41 albertel 1191: } else {
1192: # Control only passes here on an error:
1193: # the socket state does not match any
1194: # of the known states... so an error
1195: # must be logged.
1.1 foxr 1196:
1.41 albertel 1197: &Debug(4, "Invalid socket state ".$State."\n");
1198: }
1.1 foxr 1199:
1200: }
1.81 albertel 1201:
1.6 foxr 1202: =pod
1203:
1204: =cut
1.69 matthew 1205:
1.81 albertel 1206:
1.6 foxr 1207: sub QueueDelayed {
1.8 foxr 1208: Debug(3,"QueueDelayed called");
1209:
1.6 foxr 1210: my $path = "$perlvar{'lonSockDir'}/delayed";
1.8 foxr 1211:
1212: Debug(4, "Delayed path: ".$path);
1.6 foxr 1213: opendir(DIRHANDLE, $path);
1.75 albertel 1214:
1.82 albertel 1215: my $host_id_re = '(?:'.join('|',map {quotemeta($_)} (@all_host_ids)).')';
1.75 albertel 1216: my @alldelayed = grep(/\.$host_id_re$/, readdir(DIRHANDLE));
1.6 foxr 1217: closedir(DIRHANDLE);
1.75 albertel 1218: foreach my $dfname (sort(@alldelayed)) {
1219: my $reqfile = "$path/$dfname";
1220: my ($host_id) = ($dfname =~ /\.([^.]*)$/);
1221: Debug(4, "queueing ".$reqfile." for $host_id");
1.6 foxr 1222: my $Handle = IO::File->new($reqfile);
1223: my $cmd = <$Handle>;
1.8 foxr 1224: chomp $cmd; # There may or may not be a newline...
1.12 foxr 1225: $cmd = $cmd."\n"; # now for sure there's exactly one newline.
1.75 albertel 1226: my $Transaction = LondTransaction->new("sethost:$host_id:$cmd");
1.7 foxr 1227: $Transaction->SetDeferred($reqfile);
1228: QueueTransaction($Transaction);
1.6 foxr 1229: }
1230:
1231: }
1.1 foxr 1232:
1233: =pod
1.3 albertel 1234:
1.1 foxr 1235: =head2 MakeLondConnection
1.3 albertel 1236:
1237: Create a new lond connection object, and start it towards its initial
1.97 raeburn 1238: idleness. Once idle, it becomes eligible to receive transactions
1.3 albertel 1239: from the work queue. If the work queue is not empty when the
1240: connection is completed and becomes idle, it will dequeue an entry and
1241: start off on it.
1242:
1.1 foxr 1243: =cut
1.3 albertel 1244:
1.105 raeburn 1245: sub MakeLondConnection {
1246: my ($restart) = @_;
1.1 foxr 1247: Debug(4,"MakeLondConnection to ".GetServerHost()." on port "
1248: .GetServerPort());
1249:
1250: my $Connection = LondConnection->new(&GetServerHost(),
1.81 albertel 1251: &GetServerPort(),
1.107 raeburn 1252: &GetHostId(),
1.108 raeburn 1253: &GetDefHostId(),
1254: &GetLoncapaRev());
1.1 foxr 1255:
1.105 raeburn 1256: if($Connection eq undef) {
1.9 foxr 1257: Log("CRITICAL","Failed to make a connection with lond.");
1.10 foxr 1258: $ConnectionRetriesLeft--;
1259: return 0; # Failure.
1.5 foxr 1260: } else {
1.82 albertel 1261: $LondConnecting = 1; # Connection in progress.
1.5 foxr 1262: # The connection needs to have writability
1263: # monitored in order to send the init sequence
1264: # that starts the whole authentication/key
1265: # exchange underway.
1266: #
1267: my $Socket = $Connection->GetSocket();
1.30 foxr 1268: if($Socket eq undef) {
1.64 foxr 1269: &child_exit(-1, "did not get a socket from the connection");
1.5 foxr 1270: } else {
1271: &Debug(9,"MakeLondConnection got socket: ".$Socket);
1272: }
1.1 foxr 1273:
1.21 foxr 1274: $Connection->SetTimeoutCallback(\&SocketTimeout);
1275:
1.23 foxr 1276: my $event = Event->io(fd => $Socket,
1.5 foxr 1277: poll => 'w',
1278: cb => \&LondWritable,
1.8 foxr 1279: data => $Connection,
1.5 foxr 1280: desc => 'Connection to lond server');
1281: $ActiveConnections{$Connection} = $event;
1.52 foxr 1282: if ($ConnectionCount == 0) {
1283: &SetupTimer; # Need to handle timeouts with connections...
1284: }
1.105 raeburn 1285: unless ($restart) {
1286: $ConnectionCount++;
1287: }
1.95 foxr 1288: $Connection->SetClientData($ConnectionCount);
1.8 foxr 1289: Debug(4, "Connection count = ".$ConnectionCount);
1.6 foxr 1290: if($ConnectionCount == 1) { # First Connection:
1291: QueueDelayed;
1292: }
1.97 raeburn 1293: Log("SUCCESS", "Created connection ".$ConnectionCount
1.9 foxr 1294: ." to host ".GetServerHost());
1.10 foxr 1295: return 1; # Return success.
1.1 foxr 1296: }
1297:
1298: }
1.3 albertel 1299:
1.1 foxr 1300: =pod
1.3 albertel 1301:
1.1 foxr 1302: =head2 StartRequest
1.3 albertel 1303:
1304: Starts a lond request going on a specified lond connection.
1305: parameters are:
1306:
1307: =item $Lond
1308:
1309: Connection to the lond that will send the transaction and receive the
1310: reply.
1311:
1312: =item $Client
1313:
1.97 raeburn 1314: Connection to the client that is making this request. We got the
1.3 albertel 1315: request from this socket, and when the request has been relayed to
1316: lond and we get a reply back from lond it will get sent to this
1317: socket.
1318:
1319: =item $Request
1320:
1321: The text of the request to send.
1322:
1.1 foxr 1323: =cut
1324:
1325: sub StartRequest {
1.47 foxr 1326:
1327: my ($Lond, $Request) = @_;
1.1 foxr 1328:
1.7 foxr 1329: Debug(6, "StartRequest: ".$Request->getRequest());
1.1 foxr 1330:
1331: my $Socket = $Lond->GetSocket();
1332:
1.7 foxr 1333: $Request->Activate($Lond);
1334: $ActiveTransactions{$Lond} = $Request;
1.1 foxr 1335:
1.7 foxr 1336: $Lond->InitiateTransaction($Request->getRequest());
1.23 foxr 1337: my $event = Event->io(fd => $Socket,
1.1 foxr 1338: poll => "w",
1339: cb => \&LondWritable,
1340: data => $Lond,
1341: desc => "lond transaction connection");
1342: $ActiveConnections{$Lond} = $event;
1343: Debug(8," Start Request made watcher data with ".$event->data."\n");
1344: }
1345:
1346: =pod
1.3 albertel 1347:
1.1 foxr 1348: =head2 QueueTransaction
1.3 albertel 1349:
1350: If there is an idle lond connection, it is put to work doing this
1351: transaction. Otherwise, the transaction is placed in the work queue.
1352: If placed in the work queue and the maximum number of connections has
1353: not yet been created, a new connection will be started. Our goal is
1354: to eventually have a sufficient number of connections that the work
1355: queue will typically be empty. parameters are:
1356:
1357: =item Socket
1358:
1359: open on the lonc client.
1360:
1361: =item Request
1362:
1363: data to send to the lond.
1.1 foxr 1364:
1365: =cut
1.3 albertel 1366:
1.1 foxr 1367: sub QueueTransaction {
1368:
1.7 foxr 1369: my $requestData = shift; # This is a LondTransaction.
1370: my $cmd = $requestData->getRequest();
1371:
1372: Debug(6,"QueueTransaction: ".$cmd);
1.1 foxr 1373:
1374: my $LondSocket = $IdleConnections->pop();
1375: if(!defined $LondSocket) { # Need to queue request.
1.29 foxr 1376: Debug(5,"Must queue...");
1.1 foxr 1377: $WorkQueue->enqueue($requestData);
1.56 foxr 1378: Debug(5, "Queue Transaction startnew $ConnectionCount $LondConnecting");
1379: if(($ConnectionCount < $MaxConnectionCount) && (! $LondConnecting)) {
1380:
1.22 foxr 1381: if($ConnectionRetriesLeft > 0) {
1.29 foxr 1382: Debug(5,"Starting additional lond connection");
1.56 foxr 1383: if(&MakeLondConnection() == 0) {
1.22 foxr 1384: EmptyQueue(); # Fail transactions, can't make connection.
1.42 foxr 1385: CloseAllLondConnections; # Should all be closed but...
1.22 foxr 1386: }
1387: } else {
1388: ShowStatus(GetServerHost()." >>> DEAD !!!! <<<");
1.56 foxr 1389: $LondConnecting = 0;
1.22 foxr 1390: EmptyQueue(); # It's worse than that ... he's dead Jim.
1.42 foxr 1391: CloseAllLondConnections; # Should all be closed but..
1.17 foxr 1392: }
1.1 foxr 1393: }
1394: } else { # Can start the request:
1395: Debug(8,"Can start...");
1.7 foxr 1396: StartRequest($LondSocket, $requestData);
1.1 foxr 1397: }
1398: }
1399:
1.95 foxr 1400: #-------------------------- Lonc UNIX socket handling -------------------
1.1 foxr 1401: =pod
1.3 albertel 1402:
1.1 foxr 1403: =head2 ClientRequest
1.97 raeburn 1404:
1.3 albertel 1405: Callback that is called when data can be read from the UNIX domain
1406: socket connecting us with an apache server process.
1.1 foxr 1407:
1408: =cut
1409:
1410: sub ClientRequest {
1411: Debug(6, "ClientRequest");
1412: my $event = shift;
1413: my $watcher = $event->w;
1414: my $socket = $watcher->fd;
1415: my $data = $watcher->data;
1416: my $thisread;
1417:
1418: Debug(9, " Watcher named: ".$watcher->desc);
1419:
1420: my $rv = $socket->recv($thisread, POSIX::BUFSIZ, 0);
1421: Debug(8, "rcv: data length = ".length($thisread)
1422: ." read =".$thisread);
1.29 foxr 1423: unless (defined $rv && length($thisread)) {
1.1 foxr 1424: # Likely eof on socket.
1425: Debug(5,"Client Socket closed on lonc for ".$RemoteHost);
1426: close($socket);
1427: $watcher->cancel();
1428: delete($ActiveClients{$socket});
1.10 foxr 1429: return;
1.1 foxr 1430: }
1431: Debug(8,"Data: ".$data." this read: ".$thisread);
1432: $data = $data.$thisread; # Append new data.
1433: $watcher->data($data);
1.44 albertel 1434: if($data =~ /\n$/) { # Request entirely read.
1.87 albertel 1435: if ($data eq "close_connection_exit\n") {
1.9 foxr 1436: Log("CRITICAL",
1437: "Request Close Connection ... exiting");
1438: CloseAllLondConnections();
1439: exit;
1.87 albertel 1440: } elsif ($data eq "reset_retries\n") {
1441: Log("INFO", "Resetting Connection Retries.");
1442: $ConnectionRetriesLeft = $ConnectionRetries;
1443: &UpdateStatus();
1444: my $Transaction = LondTransaction->new($data);
1445: $Transaction->SetClient($socket);
1446: StartClientReply($Transaction, "ok\n");
1447: $watcher->cancel();
1448: return;
1.9 foxr 1449: }
1.1 foxr 1450: Debug(8, "Complete transaction received: ".$data);
1.87 albertel 1451: if ($LogTransactions) {
1.39 foxr 1452: Log("SUCCESS", "Transaction: '$data'"); # Transaction has \n.
1453: }
1.8 foxr 1454: my $Transaction = LondTransaction->new($data);
1.7 foxr 1455: $Transaction->SetClient($socket);
1456: QueueTransaction($Transaction);
1.1 foxr 1457: $watcher->cancel(); # Done looking for input data.
1458: }
1459:
1460: }
1461:
1.62 foxr 1462: #
1463: # Accept a connection request for a client (lonc child) and
1464: # start up an event watcher to keep an eye on input from that
1465: # Event. This can be called both from NewClient and from
1.80 albertel 1466: # ChildProcess.
1.62 foxr 1467: # Parameters:
1468: # $socket - The listener socket.
1469: # Returns:
1470: # NONE
1471: # Side Effects:
1472: # An event is made to watch the accepted connection.
1473: # Active clients hash is updated to reflect the new connection.
1474: # The client connection count is incremented.
1475: #
1476: sub accept_client {
1477: my ($socket) = @_;
1478:
1479: Debug(8, "Entering accept for lonc UNIX socket\n");
1480: my $connection = $socket->accept(); # Accept the client connection.
1481: Debug(8,"Connection request accepted from "
1482: .GetPeername($connection, AF_UNIX));
1483:
1484:
1485: my $description = sprintf("Connection to lonc client %d",
1486: $ClientConnection);
1487: Debug(9, "Creating event named: ".$description);
1488: Event->io(cb => \&ClientRequest,
1489: poll => 'r',
1490: desc => $description,
1491: data => "",
1492: fd => $connection);
1493: $ActiveClients{$connection} = $ClientConnection;
1494: $ClientConnection++;
1495: }
1.1 foxr 1496:
1497: =pod
1.3 albertel 1498:
1.1 foxr 1499: =head2 NewClient
1.3 albertel 1500:
1501: Callback that is called when a connection is received on the unix
1502: socket for a new client of lonc. The callback is parameterized by the
1503: event.. which is a-priori assumed to be an io event, and therefore has
1.97 raeburn 1504: an fd member that is the Listener socket. We accept the connection
1.3 albertel 1505: and register a new event on the readability of that socket:
1506:
1.1 foxr 1507: =cut
1.3 albertel 1508:
1.1 foxr 1509: sub NewClient {
1510: Debug(6, "NewClient");
1511: my $event = shift; # Get the event parameters.
1512: my $watcher = $event->w;
1513: my $socket = $watcher->fd; # Get the event' socket.
1514:
1.62 foxr 1515: &accept_client($socket);
1.1 foxr 1516: }
1.3 albertel 1517:
1518: =pod
1519:
1520: =head2 GetLoncSocketPath
1521:
1522: Returns the name of the UNIX socket on which to listen for client
1523: connections.
1.1 foxr 1524:
1.58 foxr 1525: =head2 Parameters:
1526:
1527: host (optional) - Name of the host socket to return.. defaults to
1528: the return from GetServerHost().
1529:
1.1 foxr 1530: =cut
1.3 albertel 1531:
1.1 foxr 1532: sub GetLoncSocketPath {
1.58 foxr 1533:
1534: my $host = GetServerHost(); # Default host.
1535: if (@_) {
1536: ($host) = @_; # Override if supplied.
1537: }
1538: return $UnixSocketDir."/".$host;
1.1 foxr 1539: }
1540:
1.3 albertel 1541: =pod
1542:
1543: =head2 GetServerHost
1544:
1545: Returns the host whose lond we talk with.
1546:
1.1 foxr 1547: =cut
1.3 albertel 1548:
1.7 foxr 1549: sub GetServerHost {
1.1 foxr 1550: return $RemoteHost; # Setup by the fork.
1551: }
1.3 albertel 1552:
1553: =pod
1554:
1.107 raeburn 1555: =head2 GetHostId
1.81 albertel 1556:
1557: Returns the hostid whose lond we talk with.
1558:
1559: =cut
1560:
1561: sub GetHostId {
1562: return $RemoteHostId; # Setup by the fork.
1563: }
1564:
1565: =pod
1566:
1.107 raeburn 1567: =head2 GetDefHostId
1568:
1569: Returns the default hostid for the node whose lond we talk with.
1570:
1571: =cut
1572:
1573: sub GetDefHostId { # Setup by the fork.
1574: return $RemoteDefHostId;
1575: }
1576:
1577: =pod
1578:
1.108 raeburn 1579: =head2 GetLoncapaRev
1580:
1581: Returns the LON-CAPA version for the node whose lond we talk with.
1582:
1583: =cut
1584:
1585: sub GetLoncapaRev {
1586: return $RemoteLoncapaRev; # Setup by the fork.
1587: }
1588:
1589: =pod
1590:
1.3 albertel 1591: =head2 GetServerPort
1592:
1593: Returns the lond port number.
1594:
1.1 foxr 1595: =cut
1.3 albertel 1596:
1.7 foxr 1597: sub GetServerPort {
1.1 foxr 1598: return $perlvar{londPort};
1599: }
1.3 albertel 1600:
1601: =pod
1602:
1603: =head2 SetupLoncListener
1604:
1605: Setup a lonc listener event. The event is called when the socket
1606: becomes readable.. that corresponds to the receipt of a new
1607: connection. The event handler established will accept the connection
1.99 raeburn 1608: (creating a communications channel), that in turn will establish
1.3 albertel 1609: another event handler to subess requests.
1.1 foxr 1610:
1.58 foxr 1611: =head2 Parameters:
1612:
1613: host (optional) Name of the host to set up a unix socket to.
1614:
1.1 foxr 1615: =cut
1.3 albertel 1616:
1.1 foxr 1617: sub SetupLoncListener {
1.78 albertel 1618: my ($host,$SocketName) = @_;
1619: if (!$host) { $host = &GetServerHost(); }
1620: if (!$SocketName) { $SocketName = &GetLoncSocketPath($host); }
1.1 foxr 1621:
1.78 albertel 1622:
1623: unlink($SocketName);
1.58 foxr 1624:
1.1 foxr 1625: my $socket;
1.7 foxr 1626: unless ($socket =IO::Socket::UNIX->new(Local => $SocketName,
1.55 albertel 1627: Listen => 250,
1.1 foxr 1628: Type => SOCK_STREAM)) {
1.64 foxr 1629: if($I_am_child) {
1630: &child_exit(-1, "Failed to create a lonc listener socket");
1631: } else {
1632: die "Failed to create a lonc listner socket";
1633: }
1.1 foxr 1634: }
1.59 foxr 1635: return $socket;
1.1 foxr 1636: }
1637:
1.39 foxr 1638: #
1639: # Toggle transaction logging.
1640: # Implicit inputs:
1641: # LogTransactions
1642: # Implicit Outputs:
1643: # LogTransactions
1644: sub ToggleTransactionLogging {
1645: print STDERR "Toggle transaction logging...\n";
1646: if(!$LogTransactions) {
1647: $LogTransactions = 1;
1648: } else {
1649: $LogTransactions = 0;
1650: }
1651:
1652:
1653: Log("SUCCESS", "Toggled transaction logging: $LogTransactions \n");
1654: }
1655:
1.14 foxr 1656: =pod
1657:
1658: =head2 ChildStatus
1659:
1660: Child USR1 signal handler to report the most recent status
1661: into the status file.
1662:
1.22 foxr 1663: We also use this to reset the retries count in order to allow the
1664: client to retry connections with a previously dead server.
1.69 matthew 1665:
1.14 foxr 1666: =cut
1.46 albertel 1667:
1.14 foxr 1668: sub ChildStatus {
1669: my $event = shift;
1670: my $watcher = $event->w;
1671:
1672: Debug(2, "Reporting child status because : ".$watcher->data);
1673: my $docdir = $perlvar{'lonDocRoot'};
1.67 albertel 1674:
1675: open(LOG,">>$docdir/lon-status/loncstatus.txt");
1676: flock(LOG,LOCK_EX);
1677: print LOG $$."\t".$RemoteHost."\t".$Status."\t".
1.14 foxr 1678: $RecentLogEntry."\n";
1.38 foxr 1679: #
1680: # Write out information about each of the connections:
1681: #
1.46 albertel 1682: if ($DebugLevel > 2) {
1.67 albertel 1683: print LOG "Active connection statuses: \n";
1.46 albertel 1684: my $i = 1;
1685: print STDERR "================================= Socket Status Dump:\n";
1686: foreach my $item (keys %ActiveConnections) {
1687: my $Socket = $ActiveConnections{$item}->data;
1688: my $state = $Socket->GetState();
1.67 albertel 1689: print LOG "Connection $i State: $state\n";
1.46 albertel 1690: print STDERR "---------------------- Connection $i \n";
1.48 foxr 1691: $Socket->Dump(-1); # Ensure it gets dumped..
1.46 albertel 1692: $i++;
1693: }
1.38 foxr 1694: }
1.67 albertel 1695: flock(LOG,LOCK_UN);
1696: close(LOG);
1.22 foxr 1697: $ConnectionRetriesLeft = $ConnectionRetries;
1.70 albertel 1698: UpdateStatus();
1.14 foxr 1699: }
1700:
1.1 foxr 1701: =pod
1.3 albertel 1702:
1.10 foxr 1703: =head2 SignalledToDeath
1704:
1705: Called in response to a signal that causes a chid process to die.
1706:
1707: =cut
1708:
1709:
1710: sub SignalledToDeath {
1.14 foxr 1711: my $event = shift;
1712: my $watcher= $event->w;
1713:
1714: Debug(2,"Signalled to death! via ".$watcher->data);
1.17 foxr 1715: my ($signal) = $watcher->data;
1.10 foxr 1716: chomp($signal);
1717: Log("CRITICAL", "Abnormal exit. Child $$ for $RemoteHost "
1718: ."died through "."\"$signal\"");
1.68 albertel 1719: #LogPerm("F:lonc: $$ on $RemoteHost signalled to death: "
1720: # ."\"$signal\"");
1.105 raeburn 1721: &clear_childpid($$);
1.12 foxr 1722: exit 0;
1.10 foxr 1723:
1724: }
1.16 foxr 1725:
1.69 matthew 1726: =pod
1727:
1.16 foxr 1728: =head2 ToggleDebug
1729:
1730: This sub toggles trace debugging on and off.
1731:
1732: =cut
1733:
1734: sub ToggleDebug {
1735: my $Current = $DebugLevel;
1736: $DebugLevel = $NextDebugLevel;
1737: $NextDebugLevel = $Current;
1738:
1739: Log("SUCCESS", "New debugging level for $RemoteHost now $DebugLevel");
1740:
1741: }
1742:
1.69 matthew 1743: =pod
1744:
1.1 foxr 1745: =head2 ChildProcess
1746:
1747: This sub implements a child process for a single lonc daemon.
1.61 foxr 1748: Optional parameter:
1.97 raeburn 1749: $socket - if provided, this is a socket already open for listening
1750: on the client socket. Otherwise, a new listener is set up.
1.1 foxr 1751:
1752: =cut
1753:
1754: sub ChildProcess {
1.80 albertel 1755: # We've inherited all the
1.62 foxr 1756: # events of our parent and those have to be cancelled or else
1757: # all holy bloody chaos will result.. trust me, I already made
1758: # >that< mistake.
1759:
1760: my $host = GetServerHost();
1761: foreach my $listener (keys %parent_dispatchers) {
1762: my $watcher = $parent_dispatchers{$listener};
1763: my $s = $watcher->fd;
1764: if ($listener ne $host) { # Close everyone but me.
1765: Debug(5, "Closing listen socket for $listener");
1766: $s->close();
1767: }
1768: Debug(5, "Killing watcher for $listener");
1769:
1770: $watcher->cancel();
1.65 foxr 1771: delete($parent_dispatchers{$listener});
1.62 foxr 1772:
1773: }
1.65 foxr 1774:
1775: # kill off the parent's signal handlers too!
1776: #
1777:
1778: for my $handler (keys %parent_handlers) {
1779: my $watcher = $parent_handlers{$handler};
1780: $watcher->cancel();
1781: delete($parent_handlers{$handler});
1782: }
1783:
1.64 foxr 1784: $I_am_child = 1; # Seems like in spite of it all I may still getting
1785: # parent event dispatches.. flag I'm a child.
1.1 foxr 1786:
1787:
1.14 foxr 1788: #
1789: # Signals must be handled by the Event framework...
1.61 foxr 1790: #
1.14 foxr 1791:
1792: Event->signal(signal => "QUIT",
1793: cb => \&SignalledToDeath,
1794: data => "QUIT");
1795: Event->signal(signal => "HUP",
1796: cb => \&ChildStatus,
1797: data => "HUP");
1798: Event->signal(signal => "USR1",
1799: cb => \&ChildStatus,
1800: data => "USR1");
1.39 foxr 1801: Event->signal(signal => "USR2",
1802: cb => \&ToggleTransactionLogging);
1.16 foxr 1803: Event->signal(signal => "INT",
1804: cb => \&ToggleDebug,
1805: data => "INT");
1.1 foxr 1806:
1.93 foxr 1807: # Block the pipe signal we'll get when the socket disconnects. We detect
1808: # socket disconnection via send/receive failures. On disconnect, the
1809: # socket becomes readable .. which will force the disconnect detection.
1810:
1811: my $set = POSIX::SigSet->new(SIGPIPE);
1812: sigprocmask(SIG_BLOCK, $set);
1813:
1.62 foxr 1814: # Figure out if we got passed a socket or need to open one to listen for
1815: # client requests.
1816:
1.61 foxr 1817: my ($socket) = @_;
1818: if (!$socket) {
1819:
1820: $socket = SetupLoncListener();
1821: }
1.62 foxr 1822: # Establish an event to listen for client connection requests.
1823:
1824:
1.59 foxr 1825: Event->io(cb => \&NewClient,
1826: poll => 'r',
1827: desc => 'Lonc Listener Unix Socket',
1828: fd => $socket);
1.1 foxr 1829:
1.76 albertel 1830: $Event::DebugLevel = $DebugLevel;
1.1 foxr 1831:
1832: Debug(9, "Making initial lond connection for ".$RemoteHost);
1833:
1834: # Setup the initial server connection:
1835:
1.62 foxr 1836: # &MakeLondConnection(); // let first work request do it.
1.10 foxr 1837:
1.80 albertel 1838: # need to accept the connection since the event may not fire.
1.62 foxr 1839:
1.80 albertel 1840: &accept_client($socket);
1.5 foxr 1841:
1.1 foxr 1842: Debug(9,"Entering event loop");
1843: my $ret = Event::loop(); # Start the main event loop.
1844:
1845:
1.64 foxr 1846: &child_exit (-1,"Main event loop exited!!!");
1.1 foxr 1847: }
1848:
1849: # Create a new child for host passed in:
1850:
1851: sub CreateChild {
1.108 raeburn 1852: my ($host, $hostid, $defhostid, $loncaparev) = @_;
1.52 foxr 1853:
1.12 foxr 1854: my $sigset = POSIX::SigSet->new(SIGINT);
1855: sigprocmask(SIG_BLOCK, $sigset);
1.1 foxr 1856: $RemoteHost = $host;
1.91 foxr 1857: ShowStatus('Parent keeping the flock'); # Update time in status message.
1.9 foxr 1858: Log("CRITICAL", "Forking server for ".$host);
1.23 foxr 1859: my $pid = fork;
1.1 foxr 1860: if($pid) { # Parent
1.17 foxr 1861: $RemoteHost = "Parent";
1.83 albertel 1862: $ChildPid{$pid} = $host;
1.12 foxr 1863: sigprocmask(SIG_UNBLOCK, $sigset);
1.82 albertel 1864: undef(@all_host_ids);
1.1 foxr 1865: } else { # child.
1.81 albertel 1866: $RemoteHostId = $hostid;
1.107 raeburn 1867: $RemoteDefHostId = $defhostid;
1.108 raeburn 1868: $RemoteLoncapaRev = $loncaparev;
1.5 foxr 1869: ShowStatus("Connected to ".$RemoteHost);
1.23 foxr 1870: $SIG{INT} = 'DEFAULT';
1.12 foxr 1871: sigprocmask(SIG_UNBLOCK, $sigset);
1.81 albertel 1872: &ChildProcess(); # Does not return.
1.1 foxr 1873: }
1.61 foxr 1874: }
1.1 foxr 1875:
1.61 foxr 1876: # parent_client_connection:
1877: # Event handler that processes client connections for the parent process.
1878: # This sub is called when the parent is listening on a socket and
1879: # a connection request arrives. We must:
1880: # Start a child process to accept the connection request.
1881: # Kill our listen on the socket.
1882: # Parameter:
1883: # event - The event object that was created to monitor this socket.
1884: # event->w->fd is the socket.
1885: # Returns:
1886: # NONE
1887: #
1888: sub parent_client_connection {
1.62 foxr 1889: if ($I_am_child) {
1890: # Should not get here, but seem to anyway:
1891: &Debug(5," Child caught parent client connection event!!");
1892: my ($event) = @_;
1893: my $watcher = $event->w;
1894: $watcher->cancel(); # Try to kill it off again!!
1895: } else {
1896: &Debug(9, "parent_client_connection");
1897: my ($event) = @_;
1898: my $watcher = $event->w;
1899: my $socket = $watcher->fd;
1.81 albertel 1900: my $connection = $socket->accept(); # Accept the client connection.
1901: Event->io(cb => \&get_remote_hostname,
1902: poll => 'r',
1903: data => "",
1904: fd => $connection);
1.77 albertel 1905: }
1906: }
1907:
1908: sub get_remote_hostname {
1.82 albertel 1909: my ($event) = @_;
1910: my $watcher = $event->w;
1911: my $socket = $watcher->fd;
1912:
1913: my $thisread;
1914: my $rv = $socket->recv($thisread, POSIX::BUFSIZ, 0);
1915: Debug(8, "rcv: data length = ".length($thisread)." read =".$thisread);
1916: if (!defined($rv) || length($thisread) == 0) {
1917: # Likely eof on socket.
1918: Debug(5,"Client Socket closed on lonc for p_c_c");
1919: close($socket);
1920: $watcher->cancel();
1921: return;
1922: }
1923:
1924: my $data = $watcher->data().$thisread;
1925: $watcher->data($data);
1926: if($data =~ /\n$/) { # Request entirely read.
1927: chomp($data);
1928: } else {
1929: return;
1930: }
1.77 albertel 1931:
1.82 albertel 1932: &Debug(5,"Creating child for $data (parent_client_connection)");
1933: (my $hostname,my $lonid,@all_host_ids) = split(':',$data);
1.83 albertel 1934: $ChildHost{$hostname}++;
1935: if ($ChildHost{$hostname} == 1) {
1.107 raeburn 1936: &CreateChild($hostname,$lonid,$all_host_ids[-1]);
1.83 albertel 1937: } else {
1938: &Log('WARNING',"Request for a second child on $hostname");
1939: }
1.82 albertel 1940: # Clean up the listen since now the child takes over until it exits.
1941: $watcher->cancel(); # Nolonger listening to this event
1942: $socket->send("done\n");
1943: $socket->close();
1.61 foxr 1944: }
1945:
1946: # parent_listen:
1947: # Opens a socket and starts a listen for the parent process on a client UNIX
1948: # domain socket.
1949: #
1950: # This involves:
1951: # Creating a socket for listen.
1952: # Removing any socket lock file
1953: # Adding an event handler for this socket becoming readable
1954: # To the parent's event dispatcher.
1955: # Parameters:
1956: # loncapa_host - LonCAPA cluster name of the host represented by the client
1957: # socket.
1958: # Returns:
1959: # NONE
1960: #
1961: sub parent_listen {
1962: my ($loncapa_host) = @_;
1963: Debug(5, "parent_listen: $loncapa_host");
1964:
1.78 albertel 1965: my ($socket,$file);
1966: if (!$loncapa_host) {
1967: $loncapa_host = 'common_parent';
1968: $file = $perlvar{'lonSockCreate'};
1969: } else {
1970: $file = &GetLoncSocketPath($loncapa_host);
1971: }
1972: $socket = &SetupLoncListener($loncapa_host,$file);
1973:
1.62 foxr 1974: $listening_to{$socket} = $loncapa_host;
1.61 foxr 1975: if (!$socket) {
1976: die "Unable to create a listen socket for $loncapa_host";
1977: }
1978:
1.78 albertel 1979: my $lock_file = $file.".lock";
1.61 foxr 1980: unlink($lock_file); # No problem if it doesn't exist yet [startup e.g.]
1981:
1.77 albertel 1982: my $watcher =
1983: Event->io(cb => \&parent_client_connection,
1984: poll => 'r',
1985: desc => "Parent listener unix socket ($loncapa_host)",
1986: data => "",
1987: fd => $socket);
1.62 foxr 1988: $parent_dispatchers{$loncapa_host} = $watcher;
1.61 foxr 1989:
1990: }
1991:
1.77 albertel 1992: sub parent_clean_up {
1993: my ($loncapa_host) = @_;
1.87 albertel 1994: Debug(1, "parent_clean_up: $loncapa_host");
1.77 albertel 1995:
1996: my $socket_file = &GetLoncSocketPath($loncapa_host);
1997: unlink($socket_file); # No problem if it doesn't exist yet [startup e.g.]
1998: my $lock_file = $socket_file.".lock";
1999: unlink($lock_file); # No problem if it doesn't exist yet [startup e.g.]
2000: }
2001:
1.61 foxr 2002:
1.83 albertel 2003:
2004: # This sub initiates a listen on the common unix domain lonc client socket.
2005: # loncnew starts up with no children, and only spawns off children when a
2006: # connection request occurs on the common client unix socket. The spawned
2007: # child continues to run until it has been idle a while at which point it
2008: # eventually exits and once more the parent picks up the listen.
1.61 foxr 2009: #
2010: # Parameters:
2011: # NONE
2012: # Implicit Inputs:
2013: # The configuration file that has been read in by LondConnection.
2014: # Returns:
2015: # NONE
2016: #
1.77 albertel 2017: sub listen_on_common_socket {
2018: Debug(5, "listen_on_common_socket");
1.78 albertel 2019: &parent_listen();
1.77 albertel 2020: }
2021:
1.63 foxr 2022: # server_died is called whenever a child process exits.
2023: # Since this is dispatched via a signal, we must process all
2024: # dead children until there are no more left. The action
2025: # is to:
2026: # - Remove the child from the bookeeping hashes
2027: # - Re-establish a listen on the unix domain socket associated
2028: # with that host.
2029: # Parameters:
2030: # The event, but we don't actually care about it.
2031: sub server_died {
2032: &Debug(9, "server_died called...");
2033:
2034: while(1) { # Loop until waitpid nowait fails.
2035: my $pid = waitpid(-1, WNOHANG);
2036: if($pid <= 0) {
2037: return; # Nothing left to wait for.
2038: }
2039: # need the host to restart:
2040:
1.83 albertel 2041: my $host = $ChildPid{$pid};
1.63 foxr 2042: if($host) { # It's for real...
2043: &Debug(9, "Caught sigchild for $host");
1.105 raeburn 2044: &clear_childpid($pid);
1.83 albertel 2045: delete($ChildPid{$pid});
2046: delete($ChildHost{$host});
1.81 albertel 2047: &parent_clean_up($host);
2048:
1.63 foxr 2049: } else {
2050: &Debug(5, "Caught sigchild for pid not in hosts hash: $pid");
2051: }
2052: }
2053:
2054: }
2055:
1.1 foxr 2056: #
2057: # Parent process logic pass 1:
2058: # For each entry in the hosts table, we will
2059: # fork off an instance of ChildProcess to service the transactions
2060: # to that host. Each pid will be entered in a global hash
2061: # with the value of the key, the host.
2062: # The parent will then enter a loop to wait for process exits.
2063: # Each exit gets logged and the child gets restarted.
2064: #
2065:
1.5 foxr 2066: #
2067: # Fork and start in new session so hang-up isn't going to
2068: # happen without intent.
2069: #
2070:
2071:
1.6 foxr 2072:
2073:
1.8 foxr 2074:
1.6 foxr 2075:
2076: ShowStatus("Forming new session");
2077: my $childpid = fork;
2078: if ($childpid != 0) {
2079: sleep 4; # Give child a chacne to break to
2080: exit 0; # a new sesion.
2081: }
1.8 foxr 2082: #
2083: # Write my pid into the pid file so I can be located
2084: #
2085:
2086: ShowStatus("Parent writing pid file:");
1.23 foxr 2087: my $execdir = $perlvar{'lonDaemons'};
1.8 foxr 2088: open (PIDSAVE, ">$execdir/logs/lonc.pid");
2089: print PIDSAVE "$$\n";
2090: close(PIDSAVE);
1.6 foxr 2091:
1.17 foxr 2092:
2093:
1.6 foxr 2094: if (POSIX::setsid() < 0) {
2095: print "Could not create new session\n";
2096: exit -1;
2097: }
1.5 foxr 2098:
2099: ShowStatus("Forking node servers");
2100:
1.9 foxr 2101: Log("CRITICAL", "--------------- Starting children ---------------");
2102:
1.31 foxr 2103: LondConnection::ReadConfig; # Read standard config files.
1.1 foxr 2104:
1.80 albertel 2105: $RemoteHost = "[parent]";
1.81 albertel 2106: &listen_on_common_socket();
1.60 foxr 2107:
1.12 foxr 2108: $RemoteHost = "Parent Server";
1.1 foxr 2109:
2110: # Maintain the population:
1.5 foxr 2111:
2112: ShowStatus("Parent keeping the flock");
1.1 foxr 2113:
1.12 foxr 2114:
1.80 albertel 2115: # We need to setup a SIGChild event to handle the exit (natural or otherwise)
2116: # of the children.
1.61 foxr 2117:
1.80 albertel 2118: Event->signal(cb => \&server_died,
2119: desc => "Child exit handler",
2120: signal => "CHLD");
2121:
2122:
2123: # Set up all the other signals we set up.
2124:
2125: $parent_handlers{INT} = Event->signal(cb => \&Terminate,
2126: desc => "Parent INT handler",
2127: signal => "INT");
2128: $parent_handlers{TERM} = Event->signal(cb => \&Terminate,
2129: desc => "Parent TERM handler",
2130: signal => "TERM");
1.81 albertel 2131: $parent_handlers{HUP} = Event->signal(cb => \&KillThemAll,
2132: desc => "Parent HUP handler.",
2133: signal => "HUP");
1.80 albertel 2134: $parent_handlers{USR1} = Event->signal(cb => \&CheckKids,
2135: desc => "Parent USR1 handler",
2136: signal => "USR1");
2137: $parent_handlers{USR2} = Event->signal(cb => \&UpdateKids,
2138: desc => "Parent USR2 handler.",
2139: signal => "USR2");
2140:
2141: # Start procdesing events.
2142:
2143: $Event::DebugLevel = $DebugLevel;
2144: Debug(9, "Parent entering event loop");
2145: my $ret = Event::loop();
2146: die "Main Event loop exited: $ret";
1.14 foxr 2147:
2148: =pod
2149:
2150: =head1 CheckKids
2151:
2152: Since kids do not die as easily in this implementation
1.97 raeburn 2153: as the previous one, there is no need to restart the
1.14 foxr 2154: dead ones (all dead kids get restarted when they die!!)
2155: The only thing this function does is to pass USR1 to the
2156: kids so that they report their status.
2157:
2158: =cut
2159:
2160: sub CheckKids {
2161: Debug(2, "Checking status of children");
2162: my $docdir = $perlvar{'lonDocRoot'};
2163: my $fh = IO::File->new(">$docdir/lon-status/loncstatus.txt");
2164: my $now=time;
2165: my $local=localtime($now);
2166: print $fh "LONC status $local - parent $$ \n\n";
1.65 foxr 2167: foreach my $host (keys %parent_dispatchers) {
2168: print $fh "LONC Parent process listening for $host\n";
2169: }
1.83 albertel 2170: foreach my $pid (keys %ChildPid) {
1.14 foxr 2171: Debug(2, "Sending USR1 -> $pid");
2172: kill 'USR1' => $pid; # Tell Child to report status.
2173: }
1.65 foxr 2174:
1.14 foxr 2175: }
1.24 foxr 2176:
2177: =pod
2178:
2179: =head1 UpdateKids
2180:
1.25 foxr 2181: parent's SIGUSR2 handler. This handler:
1.24 foxr 2182:
2183: =item
2184:
2185: Rereads the hosts file.
2186:
2187: =item
2188:
2189: Kills off (via sigint) children for hosts that have disappeared.
2190:
2191: =item
2192:
1.27 foxr 2193: QUITs children for hosts that already exist (this just forces a status display
1.24 foxr 2194: and resets the connection retry count for that host.
2195:
2196: =item
2197:
2198: Starts new children for hosts that have been added to the hosts.tab file since
2199: the start of the master program and maintains them.
2200:
2201: =cut
2202:
2203: sub UpdateKids {
1.27 foxr 2204:
1.25 foxr 2205: Log("INFO", "Updating connections via SIGUSR2");
1.27 foxr 2206:
1.65 foxr 2207: # I'm not sure what I was thinking in the first implementation.
2208: # someone will have to work hard to convince me the effect is any
2209: # different than Restart, especially now that we don't start up
2210: # per host servers automatically, may as well just restart.
2211: # The down side is transactions that are in flight will get timed out
2212: # (lost unless they are critical).
1.27 foxr 2213:
1.81 albertel 2214: &KillThemAll();
1.101 raeburn 2215: LondConnection->ResetReadConfig();
1.105 raeburn 2216: ShowStatus('Parent keeping the flock');
1.24 foxr 2217: }
2218:
1.14 foxr 2219:
1.13 foxr 2220: =pod
2221:
2222: =head1 Restart
2223:
2224: Signal handler for HUP... all children are killed and
1.97 raeburn 2225: we self restart. This is an el-cheapo way to re-read
1.13 foxr 2226: the config file.
2227:
2228: =cut
2229:
2230: sub Restart {
1.23 foxr 2231: &KillThemAll; # First kill all the children.
1.101 raeburn 2232: LondConnection->ResetReadConfig();
1.13 foxr 2233: Log("CRITICAL", "Restarting");
2234: my $execdir = $perlvar{'lonDaemons'};
2235: unlink("$execdir/logs/lonc.pid");
1.65 foxr 2236: exec("$executable");
1.10 foxr 2237: }
1.12 foxr 2238:
2239: =pod
2240:
2241: =head1 KillThemAll
2242:
2243: Signal handler that kills all children by sending them a
1.17 foxr 2244: SIGHUP. Responds to sigint and sigterm.
1.12 foxr 2245:
2246: =cut
2247:
1.10 foxr 2248: sub KillThemAll {
1.12 foxr 2249: Debug(2, "Kill them all!!");
1.85 albertel 2250:
2251: #local($SIG{CHLD}) = 'IGNORE';
2252: # Our children >will< die.
2253: # but we need to catch their death and cleanup after them in case this is
2254: # a restart set of kills
2255: my @allpids = keys(%ChildPid);
2256: foreach my $pid (@allpids) {
1.83 albertel 2257: my $serving = $ChildPid{$pid};
1.52 foxr 2258: ShowStatus("Nicely Killing lonc for $serving pid = $pid");
2259: Log("CRITICAL", "Nicely Killing lonc for $serving pid = $pid");
1.17 foxr 2260: kill 'QUIT' => $pid;
1.105 raeburn 2261: &clear_childpid($pid);
1.12 foxr 2262: }
1.85 albertel 2263: ShowStatus("Finished killing child processes off.");
1.1 foxr 2264: }
1.12 foxr 2265:
1.52 foxr 2266:
2267: #
2268: # Kill all children via KILL. Just in case the
2269: # first shot didn't get them.
2270:
2271: sub really_kill_them_all_dammit
2272: {
2273: Debug(2, "Kill them all Dammit");
2274: local($SIG{CHLD} = 'IGNORE'); # In case some purist reenabled them.
1.83 albertel 2275: foreach my $pid (keys %ChildPid) {
2276: my $serving = $ChildPid{$pid};
1.52 foxr 2277: &ShowStatus("Nastily killing lonc for $serving pid = $pid");
2278: Log("CRITICAL", "Nastily killing lonc for $serving pid = $pid");
2279: kill 'KILL' => $pid;
1.83 albertel 2280: delete($ChildPid{$pid});
1.105 raeburn 2281: delete($ChildKeyMode{$pid});
1.52 foxr 2282: my $execdir = $perlvar{'lonDaemons'};
2283: unlink("$execdir/logs/lonc.pid");
2284: }
2285: }
1.69 matthew 2286:
1.14 foxr 2287: =pod
2288:
2289: =head1 Terminate
2290:
2291: Terminate the system.
2292:
2293: =cut
2294:
2295: sub Terminate {
1.52 foxr 2296: &Log("CRITICAL", "Asked to kill children.. first be nice...");
2297: &KillThemAll;
2298: #
2299: # By now they really should all be dead.. but just in case
2300: # send them all SIGKILL's after a bit of waiting:
2301:
2302: sleep(4);
2303: &Log("CRITICAL", "Now kill children nasty");
2304: &really_kill_them_all_dammit;
1.17 foxr 2305: Log("CRITICAL","Master process exiting");
2306: exit 0;
1.14 foxr 2307:
2308: }
1.81 albertel 2309:
1.105 raeburn 2310: =pod
2311:
2312: =cut
2313:
1.81 albertel 2314: sub my_hostname {
1.104 raeburn 2315: use Sys::Hostname::FQDN();
2316: my $name = Sys::Hostname::FQDN::fqdn();
1.81 albertel 2317: &Debug(9,"Name is $name");
2318: return $name;
2319: }
2320:
1.105 raeburn 2321: sub record_childpid {
2322: my ($Socket) = @_;
2323: my $docdir = $perlvar{'lonDocRoot'};
2324: my $authmode = $Socket->GetKeyMode();
2325: my $peer = $Socket->PeerLoncapaHim();
2326: if (($authmode eq 'ssl') || ($authmode eq 'insecure')) {
2327: my $childpid = $$;
2328: if ($childpid) {
2329: unless (exists($ChildKeyMode{$childpid})) {
2330: $ChildKeyMode{$childpid} = $authmode;
2331: }
2332: if (-d "$docdir/lon-status/loncchld") {
2333: unless (-e "$docdir/lon-status/loncchld/$childpid") {
2334: if (open (my $pidfh,'>',"$docdir/lon-status/loncchld/$childpid")) {
2335: print $pidfh "$peer:$authmode\n";
2336: close($pidfh);
2337: }
2338: }
2339: }
2340: }
2341: }
2342: return;
2343: }
2344:
2345: sub clear_childpid {
2346: my ($childpid) = @_;
2347: my $docdir = $perlvar{'lonDocRoot'};
2348: if (-d "$docdir/lon-status/loncchld") {
2349: if ($childpid =~ /^\d+$/) {
2350: if (($ChildKeyMode{$childpid} eq 'insecure') ||
2351: ($ChildKeyMode{$childpid} eq 'ssl')) {
2352: if (-e "$docdir/lon-status/loncchld/$childpid") {
2353: unlink("$docdir/lon-status/loncchld/$childpid");
2354: }
2355: }
2356: }
2357: }
2358: if (exists($ChildKeyMode{$childpid})) {
2359: delete($ChildKeyMode{$childpid});
2360: }
2361: return;
2362: }
2363:
1.12 foxr 2364: =pod
1.1 foxr 2365:
2366: =head1 Theory
1.3 albertel 2367:
2368: The event class is used to build this as a single process with an
2369: event driven model. The following events are handled:
1.1 foxr 2370:
2371: =item UNIX Socket connection Received
2372:
2373: =item Request data arrives on UNIX data transfer socket.
2374:
2375: =item lond connection becomes writable.
2376:
2377: =item timer fires at 1 second intervals.
2378:
2379: All sockets are run in non-blocking mode. Timeouts managed by the timer
2380: handler prevents hung connections.
2381:
2382: Key data structures:
2383:
1.3 albertel 2384: =item RequestQueue
2385:
2386: A queue of requests received from UNIX sockets that are
2387: waiting for a chance to be forwarded on a lond connection socket.
2388:
2389: =item ActiveConnections
2390:
2391: A hash of lond connections that have transactions in process that are
2392: available to be timed out.
2393:
2394: =item ActiveTransactions
2395:
2396: A hash indexed by lond connections that contain the client reply
2397: socket for each connection that has an active transaction on it.
2398:
2399: =item IdleConnections
2400:
2401: A hash of lond connections that have no work to do. These connections
2402: can be closed if they are idle for a long enough time.
1.1 foxr 2403:
2404: =cut
1.88 foxr 2405:
2406: =pod
2407:
2408: =head1 Log messages
2409:
2410: The following is a list of log messages that can appear in the
2411: lonc.log file. Each log file has a severity and a message.
2412:
2413: =over 2
2414:
2415: =item Warning A socket timeout was detected
2416:
2417: If there are pending transactions in the socket's queue,
2418: they are failed (saved if critical). If the connection
2419: retry count gets exceeded by this, the
2420: remote host is marked as dead.
1.97 raeburn 2421: Called when timeouts occurred during the connection and
1.88 foxr 2422: connection dialog with a remote host.
2423:
2424: =item Critical Host makred DEAD <hostname>
2425:
2426: The numer of retry counts for contacting a host was
2427: exceeded. The host is marked dead an no
2428: further attempts will be made by that child.
2429:
2430: =item Info lonc pipe client hung up on us
2431:
2432: Write to the client pipe indicated no data transferred
2433: Socket to remote host is shut down. Reply to the client
2434: is discarded. Note: This is commented out in &ClientWriteable
2435:
2436: =item Success Reply from lond: <data>
2437:
2438: Can be enabled for debugging by setting LogTransactions to nonzero.
2439: Indicates a successful transaction with lond, <data> is the data received
2440: from the remote lond.
2441:
2442: =item Success A delayed transaction was completed
2443:
2444: A transaction that must be reliable was executed and completed
2445: as lonc restarted. This is followed by a mesage of the form
2446:
2447: S: client-name : request
2448:
2449: =item WARNING Failing transaction <cmd>:<subcmd>
2450:
2451: Transaction failed on a socket, but the failure retry count for the remote
2452: node has not yet been exhausted (the node is not yet marked dead).
2453: cmd is the command, subcmd is the subcommand. This results from a con_lost
2454: when communicating with lond.
2455:
2456: =item WARNING Shutting down a socket
2457:
2458: Called when a socket is being closed to lond. This is emitted both when
2459: idle pruning is being done and when the socket has been disconnected by the remote.
2460:
2461: =item WARNING Lond connection lost.
2462:
2463: Called when a read from lond's socket failed indicating lond has closed the
2464: connection or died. This should be followed by one or more
2465:
2466: "WARNING Failing transaction..." msgs for each in-flight or queued transaction.
2467:
1.105 raeburn 2468: =item WARNING No SSL channel (verification failed), will try with insecure channel.
2469:
2470: Called when promotion of a socket to SSL failed because SSL certificate verification failed.
2471: Domain configuration must also permit insecure channel use for key exchange. Connection
2472: negotiation will start again from the beginning, but with Authentication Mode not set to ssl.
2473:
1.88 foxr 2474: =item INFO Connected to lond version: <version>
2475:
2476: When connection negotiation is complete, the lond version is requested and logged here.
2477:
2478: =item SUCCESS Connection n to host now ready for action
2479:
2480: Emitted when connection has been completed with lond. n is then number of
2481: concurrent connections and host, the host to which the connection has just
2482: been established.
2483:
2484: =item WARNING Connection to host has been disconnected
2485:
2486: Write to a lond resulted in failure status. Connection to lond is dropped.
2487:
2488: =item SUCCESS Created connection n to host host
2489:
2490: Initial connection request to host..(before negotiation).
2491:
2492: =item CRITICAL Request Close Connection ... exiting
2493:
2494: Client has sent "close_connection_exit" The loncnew server is exiting.
2495:
2496: =item INFO Resetting Connection Retries
2497:
2498: Client has sent "reset_retries" The lond connection retries are reset to zero for the
2499: corresponding lond.
2500:
2501: =item SUCCESS Transaction <data>
2502:
2503: Only emitted if the global variable $LogTransactions was set to true.
2504: A client has requested a lond transaction <data> is the contents of the request.
2505:
2506: =item SUCCESS Toggled transaction logging <LogTransactions>
2507:
2508: The state of the $LogTransactions global has been toggled, and its current value
2509: (after being toggled) is displayed. When non zero additional logging of transactions
2510: is enabled for debugging purposes. Transaction logging is toggled on receipt of a USR2
2511: signal.
2512:
2513: =item CRITICAL Abnormal exit. Child <pid> for <host> died thorugh signal.
2514:
2515: QUIT signal received. lonc child process is exiting.
2516:
2517: =item SUCCESS New debugging level for <RemoteHost> now <DebugLevel>
2518:
2519: Debugging toggled for the host loncnew is talking with.
2520: Currently debugging is a level based scheme with higher number
2521: conveying more information. The daemon starts out at
2522: DebugLevel 0 and can toggle back and forth between that and
2523: DebugLevel 2 These are controlled by
2524: the global variables $DebugLevel and $NextDebugLevel
2525: The debug level can go up to 9.
2526: SIGINT toggles the debug level. The higher the debug level the
2527: more debugging information is spewed. See the Debug
2528: sub in loncnew.
2529:
2530: =item CRITICAL Forking server for host
2531:
2532: A child is being created to service requests for the specified host.
2533:
2534:
2535: =item WARNING Request for a second child on hostname
2536:
2537: Somehow loncnew was asked to start a second child on a host that already had a child
2538: servicing it. This request is not honored, but themessage is emitted. This could happen
2539: due to a race condition. When a client attempts to contact loncnew for a new host, a child
2540: is forked off to handle the requests for that server. The parent then backs off the Unix
2541: domain socket leaving it for the child to service all requests. If in the time between
2542: creating the child, and backing off, a new connection request comes in to the unix domain
2543: socket, this could trigger (unlikely but remotely possible),.
2544:
2545: =item CRITICAL ------ Starting Children ----
2546:
2547: This message should probably be changed to "Entering event loop" as the loncnew only starts
2548: children as needed. This message is emitted as new events are established and
2549: the event processing loop is entered.
2550:
2551: =item INFO Updating connections via SIGUSR2
2552:
2553: SIGUSR2 received. The original code would kill all clients, re-read the host file,
1.97 raeburn 2554: then restart children for each host. Now that children are started on demand, this
1.88 foxr 2555: just kills all child processes and lets requests start them as needed again.
2556:
2557:
2558: =item CRITICAL Restarting
2559:
2560: SigHUP received. all the children are killed and the script exec's itself to start again.
2561:
2562: =item CRITICAL Nicely killing lonc for host pid = <pid>
2563:
2564: Attempting to kill the child that is serving the specified host (pid given) cleanly via
1.97 raeburn 2565: SIGQUIT. The child should handle that, clean up nicely and exit.
1.88 foxr 2566:
2567: =item CRITICAL Nastily killing lonc for host pid = <pid>
2568:
2569: The child specified did not die when requested via SIGQUIT. Therefore it is killed
2570: via SIGKILL.
2571:
2572: =item CRITICAL Asked to kill children.. first be nice..
2573:
2574: In the parent's INT handler. INT kills the child processes. This inidicate loncnew
2575: is about to attempt to kill all known children via SIGQUIT. This message should be followed
2576: by one "Nicely killing" message for each extant child.
2577:
2578: =item CRITICAL Now kill children nasty
2579:
2580: In the parent's INT handler. remaining children are about to be killed via
2581: SIGKILL. Should be followed by a Nastily killing... for each lonc child that
2582: refused to die.
2583:
2584: =item CRITICAL Master process exiting
2585:
2586: In the parent's INT handler. just prior to the exit 0 call.
2587:
2588: =back
2589:
2590: =cut
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