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package FugueConfig;
use Sys::Hostname;
use strict;
my $rsh = $ENV{"RSH"};
$rsh = "rsh" unless defined $rsh;
# apply cpp to a fugue config file and open resulting pipe
sub open {
my $file = shift;
if (system("which cpp > /dev/null")) {
print "cpp command can't be located\n";
return undef;
} elsif (not -f $file) {
print "No such file '$file'\n";
return undef;
} elsif (not -r $file) {
print "'$file' is unreadable\n";
return undef;
}
open (FD, "cpp -traditional $file |") or return undef;
return \*FD;
} # end open
# basic parsing of a cpped fugue config file; each element of the returned
# array describes a non-empty line, according to the following format :
#
# [type, host, agent_name, command, [command_options]]
#
# where 'type' can take one of the following values 'comment', 'global',
# local', 'begin', and 'end'.
# a 'comment' type will be followed by an single field
#
sub parse {
my $file = shift;
my $fd = &FugueConfig::open($file);
return undef unless $fd;
my @data;
my %appname;
my $line = 0;
while(<$fd>) {
$line++;
# empty lines
if (/^\s*$/) {
next;
# comments
} elsif (/^\s*\#.*$/) {
push(@data, ['comment', $_]);
} else {
my ($type, $host, $name, $command, @param) =
m/^\s*(\S+)\s+(\S+)\s+(\S+)\s+(\S+)\s+(.*)\#*.*$/ ;
#print "t=$type h=$host n=$name c=$command p=".join(' ', @param)."\n";
if (not defined $type) {
warn ("*** FugueConfig::parse WARNING : ".
"syntax error at line $line : \n\t=> $_\n");
next;
}
unless ($type eq 'global' or $type eq 'local' or
$type eq 'begin' or $type eq 'end') {
warn ("*** FugueConfig::parse WARNING : ".
"unknown command type '$type' at line $line. Ignored.\n");
next;
}
if ($appname{$name}) {
warn ("*** FugueConfig::parse WARNING : ".
"at line $line at least 2 agents have the same name '$name'; ".
"skipping all but the first\n");
next;
}
$appname{$name} = 1 if $type eq 'global' or $type eq 'local';
push(@data, [$type, $host, $name, $command, [@param]]);
}
}
close(1, $fd);
return @data;
} # end parse
# launch an named ivy agent on a given host and on a given ivy bus
# return its pid.
sub launchAgent {
my ($appname, $host, $command, $options, $bus) = @_;
my @options = @$options if ref($options) eq 'ARRAY';
push(@options, -b => $bus) if $bus;
my $command_opt = $command.' '.join(' ', @options);
my $pid = fork;
warn ("*** FugueConfig::launchAgent WARNING: Could not fork!\n"), return
unless defined $pid;
if ($pid) {
# parent
print "*** FugueConfig::launchAgent INFO: $host: launching $appname agent ".
"with \'$command_opt\' (pid=$pid)\n";
return ($pid);
} else {
# child
my $awk_command = "awk -W interactive '{print \"[1m$appname [m \", \$0;}'";
if ($host eq 'localhost' or $host eq hostname() ) {
exec "$command_opt 2>&1 | $awk_command" or
warn "*** FugueConfig::launchAgent WARNING: Error executing $command\n";
} else {
exec "$rsh -n $host '$command_opt' 2>&1 | $awk_command "
or warn "*** FugueConfig::launchAgent WARNING: Error executing ".
"$command on $host\n";
}
}
} # end launchAgent
# launch a given command (not an ivy agent) on a given host
sub launchCommand {
my ($type, $host, $command, $options) = @_;
my @options = @$options if ref($options) eq 'ARRAY';
my $command_opt = $command.' '.join(' ', @options);
my $pid = fork;
if ($pid) {
# parent
print "*** FugueConfig::launchCommand INFO: $host: launching command ".
"\'$command_opt\' (pid=$pid)\n";
return ($pid);
} else {
# child
my $awk_command = "awk -W interactive '{print \"[1m$type [m \", \$0;}'";
if ($host eq 'localhost' or $host eq hostname() ) {
exec "$command_opt 2>&1 | $awk_command" or
warn "*** FugueConfig::launchCommand WARNING: Error executing ".
"$command\n";
} else {
exec "$rsh -n $host '$command_opt' 2>&1 | $awk_command "
or warn "*** FugueConfig::launchCommand WARNING: Error executing ".
"$command on $host\n";
}
}
} # end launchCommand
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