--- loncom/Attic/lonc 2002/02/06 14:17:50 1.23.2.1
+++ loncom/Attic/lonc 2002/02/19 22:51:13 1.28
@@ -5,7 +5,7 @@
# provides persistent TCP connections to the other servers in the network
# through multiplexed domain sockets
#
-# $Id: lonc,v 1.23.2.1 2002/02/06 14:17:50 albertel Exp $
+# $Id: lonc,v 1.28 2002/02/19 22:51:13 www Exp $
#
# Copyright Michigan State University Board of Trustees
#
@@ -43,6 +43,8 @@
# 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
@@ -55,6 +57,8 @@ use Socket;
use Fcntl;
use Tie::RefHash;
use Crypt::IDEA;
+use Net::Ping;
+use LWP::UserAgent();
my $status='';
my $lastlog='';
@@ -72,9 +76,47 @@ sub catchexception {
$childmaxattempts=5;
+# -------------------------------------- Routines to see if other box available
+
+sub online {
+ my $host=shift;
+ my $p=Net::Ping->new("tcp",20);
+ 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;
$SIG{__DIE__}=\&catchexception;
# ------------------------------------ Read httpd access.conf and get variables
@@ -118,8 +160,12 @@ open (CONFIG,"$perlvar{'lonTabDir'}/host
while ($configline=<CONFIG>) {
my ($id,$domain,$role,$name,$ip)=split(/:/,$configline);
chomp($ip);
- $hostip{$id}=$ip;
+ if ($ip) {
+ $hostip{$id}=$ip;
+ $hostname{$id}=$name;
+ }
}
+
close(CONFIG);
# -------------------------------------------------------- Routines for forking
@@ -143,8 +189,7 @@ sub REAPER { # ta
unlink($port);
}
-sub HUNTSMAN { # signal handler for SIGINT
- local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children
+sub hangup {
foreach (keys %children) {
$wasserver=$children{$_};
&status("Closing $wasserver");
@@ -152,6 +197,11 @@ sub HUNTSMAN { # si
&status("Kill PID $_ for $wasserver");
kill ('INT',$_);
}
+}
+
+sub HUNTSMAN { # signal handler for SIGINT
+ local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children
+ &hangup();
my $execdir=$perlvar{'lonDaemons'};
unlink("$execdir/logs/lonc.pid");
&logthis("<font color=red>CRITICAL: Shutting down</font>");
@@ -160,13 +210,7 @@ sub HUNTSMAN { # si
sub HUPSMAN { # signal handler for SIGHUP
local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children
- foreach (keys %children) {
- $wasserver=$children{$_};
- &status("Closing $wasserver");
- &logthis('Closing '.$wasserver.': '.&subreply('exit',$wasserver));
- &status("Kill PID $_ for $wasserver");
- kill ('INT',$_);
- }
+ &hangup();
&logthis("<font color=red>CRITICAL: Restarting</font>");
unlink("$execdir/logs/lonc.pid");
my $execdir=$perlvar{'lonDaemons'};
@@ -188,12 +232,6 @@ sub checkchildren {
sub USRMAN {
&logthis("USR1: Trying to establish connections again");
- foreach $thisserver (keys %hostip) {
- $answer=subreply("ping",$thisserver);
- &logthis("USR1: Ping $thisserver "
- ."(pid >$childpid{$thisserver}<, $childatt{thisserver} attempts): "
- ." >$answer<");
- }
%childatt=();
&checkchildren();
}
@@ -298,7 +336,9 @@ $SIG{HUP}=$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");
@@ -317,13 +357,19 @@ 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(
"<font color=yellow>INFO: Trying to reconnect for $thisserver "
."($childatt{$thisserver} of $childmaxattempts attempts)</font>");
make_new_child($thisserver);
- }
+ } else {
+ &logthis(
+ "<font color=yellow>INFO: Skipping $thisserver "
+ ."($childatt{$thisserver} of $childmaxattempts attempts)</font>");
+ }
+
}
}
}
@@ -570,13 +616,14 @@ while (1) {
# Any complete requests to process?
foreach $client (keys %ready) {
- handle($client,$conserver);
+ handle($client);
}
# Buffers to flush?
foreach $client ($select->can_write(1)) {
# Skip this client if we have nothing to say
next unless exists $outbuffer{$client};
+
$rv = $client->send($outbuffer{$client}, 0);
unless (defined $rv) {
# Whine, but move on.
@@ -606,7 +653,7 @@ while (1) {
}
}
}
-}
+
# ------------------------------------------------------- End of make_new_child
# handle($socket) deals with all pending requests for $client
@@ -614,7 +661,6 @@ sub handle {
# requests are in $ready{$client}
# send output to $outbuffer{$client}
my $client = shift;
- my $conserver = shift;
my $request;
foreach $request (@{$ready{$client}}) {
@@ -641,13 +687,10 @@ sub handle {
eval {
alarm(300);
&status("Sending $conserver: $request");
- &logthis("Sending $conserver: $request");
print $remotesock "$request";
&status("Waiting for reply from $conserver: $request");
- &logthis("Waiting for reply from $conserver: $request");
$answer=<$remotesock>;
&status("Received reply: $request");
- &logthis("Received reply $conserver: $answer");
alarm(0);
};
if ($@=~/timeout/) {
@@ -678,13 +721,13 @@ sub handle {
}
# ===================================================== Done processing request
- &logthis("Completed $conserver: $request");
}
delete $ready{$client};
&status("Completed $conserver: $request");
# -------------------------------------------------------------- End non-forker
}
# ---------------------------------------------------------- End make_new_child
+}
# nonblock($socket) puts socket into nonblocking mode
sub nonblock {