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#!/usr/bin/perl
# $Id$
use strict;
use warnings;
use Scire::Job;
use Scire::Communicator;
use Getopt::Long;
use Data::Dumper;
use File::Path;
use Sys::Hostname;
use POSIX qw/WEXITSTATUS setuid/;
my $ETC_DIR = "/etc/scire";
my $SCIRE_CONFIG_FILE = "${ETC_DIR}/scire.conf";
my %conf;
my $comm;
run_main();
sub run_main {
parse_command_line();
my $conf_file = (defined($conf{config})) ? $conf{config} : $SCIRE_CONFIG_FILE;
read_config_file($conf_file);
check_job_dir();
my $exitcode = talk_to_server();
}
sub talk_to_server {
# This functions forks a new process just for the purpose of dropping privileges.
my $pid = fork();
if($pid) {
debug("Waiting for PID ${pid} to finish");
waitpid($pid, 0);
my $exitcode = WEXITSTATUS($?);
debug("PID ${pid} has finished with status ${exitcode}");
return $exitcode;
} else {
# We'll need to add a call to setuid() here at some point
#ok folks so here's how this thang goes down.
#1. Connect.
$comm = Scire::Communicator->new( host => $conf{host}, user => $conf{user}, port => $conf{port} );
$comm->create_connection();
#2. Register with the DB. (only it knows if you're allowed to be active)
# If we do not have a defined key file, we assume this is the first run of this client
# so we register them instead of trying to identify.
if(defined($conf{key_file}) and (-f $conf{key_file})) {
if(!identify_client()) {
exit(1);
}
} else {
register_client();
exit(0);
}
#3. Scan the jobs directory. If there are done/failed jobs, report them. Note jobs in running or queue.
my @existing_jobs = scan_jobs_dir();
#4. Fetch the jobs list
get_jobs();
#5. ???
#6. Profit!
$comm->close_connection();
exit(0);
}
}
sub parse_command_line {
GetOptions(
'debug|d' => \$conf{debug},
'daemon|D' => \$conf{daemon},
'dry-run' => \$conf{dry_run},
'help|h' => \$conf{help},
'config|c=s' => \$conf{config},
'threads|t=i' => \$conf{max_threads},
#config overrides.
'host=s' => \$conf{host},
'port=i' => \$conf{port},
'user|u=s' => \$conf{user},
'server_script=s' => \$conf{server_script},
'job_dir' => \$conf{job_dir},
);
if ($conf{help}) {
print "\nusage: scireclient.pl [--debug or -d]\n\t [--dry-run]"
."\t [--config=CONF or -c] \n\t [--threads=# or -t] \t [--help or -h] \n"
."\t [[--host=HOST] \t [--port=PORT] \t [--user=USER or -u] \n\t"
." [--server_script=foo.pl] \t [--job_dir=/tmp/jobs] \n";
exit 0;
}
}
sub check_job_dir {
my @checkdirs = ($conf{job_dir}, "$conf{job_dir}/queue", "$conf{job_dir}/done", "$conf{job_dir}/failed", "$conf{job_dir}/run");
for my $dir (@checkdirs) {
if (! -d $dir) {
print "WARNING! ${dir} does not exist...creating\n";
mkpath( $dir, {verbose => 1, mode => 0660})
or die("Couldn't make ${dir} w/ perms 0660: $!");
}
}
}
sub read_config_file {
my $conf_file = shift;
my %config_defaults = (
"key_file" => "${ETC_DIR}/client_key",
"debug" => 0,
);
open(FH, "< ${conf_file}") or die("Couldn't open the config file ${conf_file}: $!");
while (<FH>) {
chomp;
next if /^\s*(?:#|$)/;
if(/^\s*(.+?)\s*=\s*(.+?)\s*(?:#.*)?$/) {
unless(defined($conf{lc($1)})) { #Don't overwrite anything specified in cmdline
$conf{lc($1)} = $2;
}
}
}
close(FH) or die("Couldn't close the config file ${conf_file}: $!");
for(keys %config_defaults) {
if(!defined $conf{$_}) {
$conf{$_} = $config_defaults{$_};
}
}
}
sub register_client {
# my $mac = "00:11:22:33:44:55";
# my $ip = "192.168.2.3";
my ($mac, $ip) = get_interface_info(defined $conf{interface} && $conf{interface} ? $conf{interface} : "eth0");
my $hostname = hostname();
my ($status, $message) = $comm->send_command("REGISTER", $mac, $ip, $hostname);
die "Could not register client $mac w/ ip $ip and hostname $hostname. Got: $message" if (! defined $status or $status ne "OK");
debug("Client registered. Status is pending. digest is $message");
open(FILE, ">$conf{key_file}") or die("Couldn't open key file $conf{key_file} for writing: $!");
print FILE "$message\n";
close(FILE);
}
sub identify_client {
open(FILE, $conf{key_file}) or die("Couldn't open client_key $conf{key_file}: $!");
my $digest = <FILE>;
chomp $digest;
close(FILE);
my ($status, $message) = $comm->send_command("IDENTIFY", $digest);
unless (defined $status && $status eq "OK") {
print "ERROR Could not identify to server: $message\n";
return 0;
}
debug("Client identified");
return 1;
}
sub get_jobs {
my ($status, $jobs) = $comm->send_command("GET_JOBS");
unless (defined $status && $status eq "OK") {
print "Could not get jobs list from server: $status\n";
return 0;
}
if (defined($jobs) && $jobs) {
$jobs =~ s/\s//g; #Remove all whitespace
my @jobs_list = split(/,/, $jobs);
foreach my $job (@jobs_list) {
my ($status, $filename) = $comm->send_command("GET_JOB", $job);
#SCP the file to $conf{job_dir}/queue/
system("cp $filename $conf{job_dir}/queue/") and die("Can't copy file: $!"); #Temporary hack. only works locally.
# XXX: Modify this to fetch a file instead
debug("Fetched job $job ");
my ($status2,$message) = $comm->send_command("JOB_FETCHED", $job);
unless (defined $status2 && $status2 eq "OK") {
die("ERROR Could not signal job was fetched: $message\n");
}
}
#This function doesn't actually need to do anything with the list of jobs, the executor handles that part.
}
}
sub scan_jobs_dir {
#Scan the dirs for job files.
my @existing_jobs = glob("$conf{job_dir}/queue/*");
my @failed_jobs = glob("$conf{job_dir}/failed/*");
my @done_jobs = glob("$conf{job_dir}/done/*");
#Report on those jobs needing reporting.
foreach my $job_file (@failed_jobs) {
$job_file =~ /(\d+)\.job/;
my $jobid = $1;
my ($status, $message) = $comm->send_command("SET_JOB_STATUS $jobid 'Failed'");
open(FILE, $job_file) or die "Couldn't open job file $job_file: $!";
my $job_data = join("", <FILE>);
close(FILE);
}
#may be able to use same code as above.
foreach my $job_file (@done_jobs) {
$job_file =~ /(\d+)\.job/;
my $jobid = $1;
my ($status, $message) = $comm->send_command("SET_JOB_STATUS $jobid 'Done'");
}
return @existing_jobs;
}
sub debug {
my $msg = shift;
if($conf{debug}) {
print STDERR $msg."\n";
}
}
sub get_interface_info {
my $interface = shift;
my $info = `/sbin/ifconfig ${interface}`;
$info =~ /^.+HWaddr ([a-zA-Z0-9:]+).+inet addr:([0-9.]+).+$/s;
my ($mac, $ip) = ($1, $2);
return ($mac, $ip);
}
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