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package Scire::Communicator;
use IPC::Open2 (open2);
sub new {
my $proto = shift;
my $class = ref($proto) || $proto;
my $self = {
port => 22,
user => scire,
server_script => "/usr/bin/scireserver.pl",
SERVER_STDOUT => undef,
SERVER_STDIN => undef,
@_
};
bless ($self, $class);
$self->build_connection_command();
return $self;
}
sub send_command {
my $self = shift;
my $cmd = shift;
my @args = @_;
my $tosend = "${cmd}";
for my $arg (@args) {
if($arg =~ /^[0-9]+$/) {
$tosend .= " ${arg}";
} else {
$arg =~ s/"/\\"/g;
$tosend .= " \"${arg}\"";
}
}
$tosend .= "\n";
my ($tmpin, $tmpout) = ($self->{SERVER_STDIN}, $self->{SERVER_STDOUT});
print $tmpin $tosend;
#FIXME WE NEED A TIMEOUT HERE OF SOME SORT!!
#if the server doesn't give you a newline this just hangs!
my $response = <$tmpout>;
return $self->parse_response($response);
}
sub parse_response {
my $self = shift;
my $response = shift;
$response =~ /^(OK|ERROR)(?: (.+?))?\s*$/;
my ($status, $message) = ($1, $2);
return ($status, $message);
}
sub create_connection {
my $self = shift;
# XXX: How do we capture this error? $pid has a valid value even if the
# process fails to run, since it just returns the PID of the forked perl
# process. I tried adding 'or die' after it, but it didn't help since it
# doesn't fail in the main process. When it fails, it outputs an error
# to STDERR:
# open2: exec of ../server/scireserver.pl failed at ./scireclient.pl line 116
$self->{connection_pid} = open2($self->{SERVER_STDOUT}, $self->{SERVER_STDIN}, $self->{connection_command});
}
sub close_connection {
my $self = shift;
close $self->{SERVER_STDIN};
close $self->{SERVER_STDOUT};
}
sub build_connection_command {
my $self = shift;
# This will eventually be something like "ssh scire@${scireserver} /usr/bin/scireserver.pl"
my $connection_command = "ssh ";
$connection_command .= "-o BatchMode yes ";
$connection_command .= "-o SendEnv 'SCIRE_*' ";
$connection_command .= "-o ServerAliveInterval 15 -o ServerAliveCountMax 4 ";
if(defined($self->{port})) {
$connection_command .= "-o Port=$conf{port} ";
}
$connection_command .= "$self->{user}\@$self->{host} $self->{server_script}";
if (-d ".svn") {
# Overwrite $connection_command in the case of a dev environment for now
$connection_command = "../server/scireserver.pl";
}
$self->{connection_command} = $connection_command;
}
1;
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