--- loncom/Attic/lonc 2001/11/29 18:57:46 1.22
+++ loncom/Attic/lonc 2002/02/19 21:12:22 1.26
@@ -5,7 +5,7 @@
# provides persistent TCP connections to the other servers in the network
# through multiplexed domain sockets
#
-# $Id: lonc,v 1.22 2001/11/29 18:57:46 www Exp $
+# $Id: lonc,v 1.26 2002/02/19 21:12:22 www Exp $
#
# Copyright Michigan State University Board of Trustees
#
@@ -39,8 +39,12 @@
# 2/8,7/25 Gerd Kortemeyer
# 12/05 Scott Harrison
# 12/05 Gerd Kortemeyer
+# YEAR=2001
# 01/10/01 Scott Harrison
# 03/14/01,03/15,06/12,11/26,11/27,11/28 Gerd Kortemeyer
+# 12/20 Scott Harrison
+# YEAR=2002
+# 2/19/02
#
# based on nonforker from Perl Cookbook
# - server who multiplexes without forking
@@ -53,6 +57,8 @@ use Socket;
use Fcntl;
use Tie::RefHash;
use Crypt::IDEA;
+use Net::Ping;
+use LWP::UserAgent();
my $status='';
my $lastlog='';
@@ -70,9 +76,47 @@ sub catchexception {
$childmaxattempts=5;
+# -------------------------------------- Routines to see if other box available
+
+sub online {
+ my $host=shift;
+ my $p=Net::Ping->new("tcp",10);
+ my $online=$p->ping("$host");
+ $p->close();
+ undef ($p);
+ return $online;
+}
+
+sub connected {
+ my ($local,$remote)=@_;
+ $local=~s/\W//g;
+ $remote=~s/\W//g;
+
+ unless ($hostname{$local}) { return 'local_unknown'; }
+ unless ($hostname{$remote}) { return 'remote_unknown'; }
+
+ unless (&online($hostname{$local})) { return 'local_offline'; }
+
+ my $ua=new LWP::UserAgent;
+
+ my $request=new HTTP::Request('GET',
+ "http://".$hostname{$local}.'/cgi-bin/ping.pl?'.$remote);
+
+ my $response=$ua->request($request);
+
+ unless ($response->is_success) { return 'local_error'; }
+
+ my $reply=$response->content;
+ $reply=(split("\n",$reply))[0];
+ $reply=~s/\W//g;
+ if ($reply ne $remote) { return $reply; }
+ return 'ok';
+}
+
+
# -------------------------------- Set signal handlers to record abnormal exits
-$SIG{'QUIT'}=\&catchexception;
+$SIG{QUIT}=\&catchexception;
$SIG{__DIE__}=\&catchexception;
# ------------------------------------ Read httpd access.conf and get variables
@@ -143,13 +187,13 @@ sub REAPER { # ta
sub HUNTSMAN { # signal handler for SIGINT
local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children
- map {
+ foreach (keys %children) {
$wasserver=$children{$_};
&status("Closing $wasserver");
&logthis('Closing '.$wasserver.': '.&subreply('exit',$wasserver));
&status("Kill PID $_ for $wasserver");
kill ('INT',$_);
- } keys %children;
+ }
my $execdir=$perlvar{'lonDaemons'};
unlink("$execdir/logs/lonc.pid");
&logthis("CRITICAL: Shutting down");
@@ -158,13 +202,13 @@ sub HUNTSMAN { # si
sub HUPSMAN { # signal handler for SIGHUP
local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children
- map {
+ foreach (keys %children) {
$wasserver=$children{$_};
&status("Closing $wasserver");
&logthis('Closing '.$wasserver.': '.&subreply('exit',$wasserver));
&status("Kill PID $_ for $wasserver");
kill ('INT',$_);
- } keys %children;
+ }
&logthis("CRITICAL: Restarting");
unlink("$execdir/logs/lonc.pid");
my $execdir=$perlvar{'lonDaemons'};
@@ -175,13 +219,13 @@ sub checkchildren {
&initnewstatus();
&logstatus();
&logthis('Going to check on the children');
- map {
+ foreach (sort keys %children) {
sleep 1;
unless (kill 'USR1' => $_) {
&logthis ('Child '.$_.' is dead');
&logstatus($$.' is dead');
}
- } sort keys %children;
+ }
}
sub USRMAN {
@@ -296,7 +340,9 @@ $SIG{HUP}=$SIG{USR1}='IGNORE';
&status("Forking ...");
foreach $thisserver (keys %hostip) {
- make_new_child($thisserver);
+ if (&online($hostname{$thisserver})) {
+ make_new_child($thisserver);
+ }
}
&logthis("Done starting initial servers");
@@ -315,13 +361,19 @@ while (1) {
&status("Woke up");
foreach $thisserver (keys %hostip) {
if (!$childpid{$thisserver}) {
- if ($childatt{$thisserver}<$childmaxattempts) {
+ if (($childatt{$thisserver}<$childmaxattempts) &&
+ (&online($hostname{$thisserver}))) {
$childatt{$thisserver}++;
&logthis(
"INFO: Trying to reconnect for $thisserver "
."($childatt{$thisserver} of $childmaxattempts attempts)");
make_new_child($thisserver);
- }
+ } else {
+ &logthis(
+ "INFO: Skipping $thisserver "
+ ."($childatt{$thisserver} of $childmaxattempts attempts)");
+ }
+
}
}
}
@@ -447,7 +499,7 @@ if ($cipher=new IDEA $cipherkey) {
@allbuffered=grep /\.$conserver$/, readdir DIRHANDLE;
closedir(DIRHANDLE);
my $dfname;
- map {
+ foreach (@allbuffered) {
&status("Sending delayed $conserver $_");
$dfname="$path/$_";
&logthis($dfname);
@@ -488,7 +540,7 @@ if ($cipher=new IDEA $cipherkey) {
&logthis("Delayed $cmd to $conserver: >$answer<");
&logperm("S:$conserver:$bcmd");
}
- } @allbuffered;
+ }
# ------------------------------------------------------- Listen to UNIX socket
&status("Opening socket $conserver");
@@ -693,3 +745,50 @@ sub nonblock {
or die "Can't make socket nonblocking: $!\n";
}
+# ----------------------------------- POD (plain old documentation, CPAN style)
+
+=head1 NAME
+
+lonc - LON TCP-MySQL-Server Daemon for handling database requests.
+
+=head1 SYNOPSIS
+
+Should only be run as user=www. This is a command-line script which
+is invoked by loncron.
+
+=head1 DESCRIPTION
+
+Provides persistent TCP connections to the other servers in the network
+through multiplexed domain sockets
+
+ PID in subdir logs/lonc.pid
+ kill kills
+ HUP restarts
+ USR1 tries to open connections again
+
+=head1 README
+
+Not yet written.
+
+=head1 PREREQUISITES
+
+POSIX
+IO::Socket
+IO::Select
+IO::File
+Socket
+Fcntl
+Tie::RefHash
+Crypt::IDEA
+
+=head1 COREQUISITES
+
+=head1 OSNAMES
+
+linux
+
+=head1 SCRIPT CATEGORIES
+
+Server/Process
+
+=cut