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package Scire::Job;
use POSIX qw/WEXITSTATUS WIFEXITED waitpid/;
use IPC::Open3 (open3);
sub new {
my $proto = shift;
my $class = ref($proto) || $proto;
my $filename = shift;
my $self = {};
bless ($self, $class);
if(defined $filename) {
$self->load_jobfile($filename);
}
return $self;
}
sub load_jobfile {
my $self = shift;
my $filename = shift;
$self->{filename} = $filename;
my $jobcontents;
my $jobdata;
open JOB, "< ${filename}" or die "Can't open file ${filename}";
$jobcontents = join("", <JOB>);
close JOB;
$jobdata = eval($jobcontents);
($@) and print "ERROR: Could not parse job file ${filename}!\n";
if(defined $jobdata->{script}) {
for(keys %{$jobdata->{script}}) {
$self->{$_} = $jobdata->{script}->{$_};
}
}
for(keys %{$jobdata}) {
$self->{$_} = $jobdata->{$_} unless($_ eq "script");
}
}
sub set_stdout_file {
my ($self, $outfile) = @_;
if(defined $outfile && $outfile) {
$self->{stdout_filename} = $outfile;
}
}
sub set_stderr_file {
my ($self, $errfile) = @_;
if(defined $errfile && $errfile) {
$self->{stderr_filename} = $errfile;
}
}
sub run {
my $self = shift;
# XXX: write $self->{script_data} out to a file and mark it +x. We'll need
# to find a good location for this, since it can't be noexec. Perhaps the
# queue dir in the job directory will do, or maybe it will be configurable
my $pid = fork();
if($fork) {
# XXX: eventually, we'll move the waitpid() call to another function
# called something like is_running() and use WNOHANG instead of blocking
waitpid($pid, 0);
my $status = $?;
my $exitcode = -1;
if(WIFEXITED($status)) {
my $exitcode = WEXITSTATUS($status);
}
return $exitcode;
} else {
# XXX: we'll use setuid to drop privileges here
if(defined $self->{stdout_filename}) {
open STDOUT, '>', $self->{stdout_filename};
}
if(defined $self->{stderr_filename}) {
open STDERR, '>', $self->{stderr_filename};
}
# XXX: exec() to run our command. our STDOUT and STDERR have been
# redirected to the files specified, and the exit code is returned
# to the main process when we're done executing
}
}
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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