#!/usr/bin/env python
#
# This file is part of Jobmonarch
#
# Copyright (C) 2006-2013  Ramon Bastiaans
# Copyright (C) 2007, 2009  Dave Love  (SGE code)
# 
# Jobmonarch is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
# 
# Jobmonarch is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
# 
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
# 
# SVN $Id: jobmond.py 784 2013-04-04 14:01:03Z ramonb $
#

# vi :set ts=4

import sys, getopt, ConfigParser, time, os, socket, string, re
import xdrlib, socket, syslog, xml, xml.sax, shlex, os.path
from xml.sax.handler import feature_namespaces
from collections import deque
from glob import glob

VERSION='0.4+SVN'

def usage( ver ):

    print 'jobmond %s' %VERSION

    if ver:
        return 0

    print
    print 'Purpose:'
    print '  The Job Monitoring Daemon (jobmond) reports batch jobs information and statistics'
    print '  to Ganglia, which can be viewed with Job Monarch web frontend'
    print
    print 'Usage:    jobmond [OPTIONS]'
    print
    print '  -c, --config=FILE    The configuration file to use (default: /etc/jobmond.conf)'
    print '  -p, --pidfile=FILE    Use pid file to store the process id'
    print '  -h, --help        Print help and exit'
    print '  -v, --version      Print version and exit'
    print

def processArgs( args ):

    SHORT_L      = 'p:hvc:'
    LONG_L       = [ 'help', 'config=', 'pidfile=', 'version' ]

    global PIDFILE, JOBMOND_CONF
    PIDFILE      = None

    JOBMOND_CONF = '/etc/jobmond.conf'

    try:

        opts, args    = getopt.getopt( args, SHORT_L, LONG_L )

    except getopt.GetoptError, detail:

        print detail
        usage()
        sys.exit( 1 )

    for opt, value in opts:

        if opt in [ '--config', '-c' ]:
        
            JOBMOND_CONF = value

        if opt in [ '--pidfile', '-p' ]:

            PIDFILE      = value
        
        if opt in [ '--help', '-h' ]:
 
            usage( False )
            sys.exit( 0 )

        if opt in [ '--version', '-v' ]:

            usage( True )
            sys.exit( 0 )

    return loadConfig( JOBMOND_CONF )

class GangliaConfigParser:

    def __init__( self, filename ):

        self.conf_lijst   = [ ]
        self.conf_dict    = { }
        self.filename     = filename
        self.file_pointer = file( filename, 'r' )
        self.lexx         = shlex.shlex( self.file_pointer )
        self.lexx.whitespace_split = True

        self.parse()

    def __del__( self ):

        """
        Cleanup: close file descriptor
        """

        self.file_pointer.close()
        del self.lexx
        del self.conf_lijst

    def removeQuotes( self, value ):

        clean_value = value
        clean_value = clean_value.replace( "'", "" )
        clean_value = clean_value.replace( '"', '' )
        clean_value = clean_value.strip()

        return clean_value

    def removeBraces( self, value ):

        clean_value = value
        clean_value = clean_value.replace( "(", "" )
        clean_value = clean_value.replace( ')', '' )
        clean_value = clean_value.strip()

        return clean_value

    def parse( self ):

        """
        Parse self.filename using shlex scanning.
        - Removes /* comments */
        - Traverses (recursively) through all include () statements
        - Stores complete valid config tokens in self.conf_list

        i.e.:
            ['globals',
             '{',
             'daemonize',
             '=',
             'yes',
             'setuid',
             '=',
             'yes',
             'user',
             '=',
             'ganglia',
             'debug_level',
             '=',
             '0', 
             <etc> ]
        """

        t = 'bogus'
        c = False
        i = False

        while t != self.lexx.eof:
            #print 'get token'
            t = self.lexx.get_token()

            if len( t ) >= 2:

                if len( t ) >= 4:

                    if t[:2] == '/*' and t[-2:] == '*/':

                        #print 'comment line'
                        #print 'skipping: %s' %t
                        continue

                if t == '/*' or t[:2] == '/*':
                    c = True
                    #print 'comment start'
                    #print 'skipping: %s' %t
                    continue

                if t == '*/' or t[-2:] == '*/':
                    c = False
                    #print 'skipping: %s' %t
                    #print 'comment end'
                    continue

            if c:
                #print 'skipping: %s' %t
                continue

            if t == 'include':
                i = True
                #print 'include start'
                #print 'skipping: %s' %t
                continue

            if i:

                #print 'include start: %s' %t

                t2 = self.removeQuotes( t )
                t2 = self.removeBraces( t )

                for in_file in glob( self.removeQuotes(t2) ):

                    #print 'including file: %s' %in_file
                    parse_infile = GangliaConfigParser( in_file )

                    self.conf_lijst = self.conf_lijst + parse_infile.getConfLijst()

                    del parse_infile

                i = False
                #print 'include end'
                #print 'skipping: %s' %t
                continue

            #print 'keep: %s' %t
            self.conf_lijst.append( self.removeQuotes(t) )

    def getConfLijst( self ):

        return self.conf_lijst

    def confListToDict( self, parent_list=None ):

        """
        Recursively traverses a conf_list and creates dictionary from it
        """

        new_dict = { }
        count    = 0
        skip     = 0

        if not parent_list:
            parent_list = self.conf_lijst

        #print 'entering confListToDict(): (parent) list size %s' %len(parent_list)

        for n, c in enumerate( parent_list ):

            count = count + 1

            #print 'CL: n %d c %s' %(n, c)

            if skip > 0:

                #print '- skipped'
                skip = skip - 1
                continue

            if (n+1) <= (len( parent_list )-1):

                if parent_list[(n+1)] == '{':

                    if not new_dict.has_key( c ):
                        new_dict[ c ] = [ ]

                    (temp_new_dict, skip) = self.confListToDict( parent_list[(n+2):] )
                    new_dict[ c ].append( temp_new_dict )

                if parent_list[(n+1)] == '=' and (n+2) <= (len( parent_list )-1):

                    if not new_dict.has_key( c ):
                        new_dict[ c ] = [ ]

                    new_dict[ c ].append( parent_list[ (n+2) ] )

                    skip = 2

                if parent_list[n] == '}':

                    #print 'leaving confListToDict(): new dict = %s' %new_dict
                    return (new_dict, count)

    def makeConfDict( self ):

        """
        Walks through self.conf_list and creates a dictionary based upon config values

        i.e.:
            'tcp_accept_channel': [{'acl': [{'access': [{'action': ['"allow"'],
                                                         'ip': ['"127.0.0.1"'],
                                                         'mask': ['32']}]}],
                                    'port': ['8649']}],
            'udp_recv_channel': [{'port': ['8649']}],
            'udp_send_channel': [{'host': ['145.101.32.3'],
                                  'port': ['8649']},
                                 {'host': ['145.101.32.207'],
                                  'port': ['8649']}]}
        """

        new_dict = { }
        skip     = 0

        #print 'entering makeConfDict()'

        for n, c in enumerate( self.conf_lijst ):

            #print 'M: n %d c %s' %(n, c)

            if skip > 0:

                #print '- skipped'
                skip = skip - 1
                continue

            if (n+1) <= (len( self.conf_lijst )-1):

                if self.conf_lijst[(n+1)] == '{':

                    if not new_dict.has_key( c ):
                        new_dict[ c ] = [ ]

                    ( temp_new_dict, skip ) = self.confListToDict( self.conf_lijst[(n+2):] )
                    new_dict[ c ].append( temp_new_dict )

                if self.conf_lijst[(n+1)] == '=' and (n+2) <= (len( self.conf_lijst )-1):

                    if not new_dict.has_key( c ):
                        new_dict[ c ] = [ ]

                    new_dict[ c ].append( self.conf_lijst[ (n+2) ] )

                    skip = 2

        self.conf_dict = new_dict
        #print 'leaving makeConfDict(): conf dict size %d' %len( self.conf_dict )

    def checkConfDict( self ):

        if len( self.conf_lijst ) == 0:

            raise Exception("Something went wrong generating conf list for %s" %self.file_name )

        if len( self.conf_dict ) == 0:

            self.makeConfDict()

    def getConfDict( self ):

        self.checkConfDict()
        return self.conf_dict

    def getUdpSendChannels( self ):

        self.checkConfDict()

        udp_send_channels = [ ] # IP:PORT

        if not self.conf_dict.has_key( 'udp_send_channel' ):
            return None

        for u in self.conf_dict[ 'udp_send_channel' ]:

            if u.has_key( 'mcast_join' ):

                ip = u['mcast_join'][0]

            elif u.has_key( 'host' ):

                ip = u['host'][0]

            port = u['port'][0]

            udp_send_channels.append( ( ip, port ) )

        if len( udp_send_channels ) == 0:
            return None

        return udp_send_channels

    def getSectionLastOption( self, section, option ):

        """
        Get last option set in a config section that could be set multiple times in multiple (include) files.

        i.e.: getSectionLastOption( 'globals', 'send_metadata_interval' )
        """

        self.checkConfDict()
        value = None

        if not self.conf_dict.has_key( section ):

            return None

        # Could be set multiple times in multiple (include) files: get last one set
        for c in self.conf_dict[ section ]:

                if c.has_key( option ):

                    value = c[ option ][0]

        return value

    def getClusterName( self ):

        return self.getSectionLastOption( 'cluster', 'name' )

    def getVal( self, section, option ):

        return self.getSectionLastOption( section, option )

    def getInt( self, section, valname ):

        value    = self.getVal( section, valname )

        if not value:
            return None

        return int( value )

    def getStr( self, section, valname ):

        value    = self.getVal( section, valname )

        if not value:
            return None

        return str( value )

def findGmetric():

    for dir in os.path.expandvars( '$PATH' ).split( ':' ):

        guess    = '%s/%s' %( dir, 'gmetric' )

        if os.path.exists( guess ):

            return guess

    return False

def loadConfig( filename ):

    def getlist( cfg_string ):

        my_list = [ ]

        for item_txt in cfg_string.split( ',' ):

            sep_char = None

            item_txt = item_txt.strip()

            for s_char in [ "'", '"' ]:

                if item_txt.find( s_char ) != -1:

                    if item_txt.count( s_char ) != 2:

                        print 'Missing quote: %s' %item_txt
                        sys.exit( 1 )

                    else:

                        sep_char = s_char
                        break

            if sep_char:

                item_txt = item_txt.split( sep_char )[1]

            my_list.append( item_txt )

        return my_list

    if not os.path.isfile( JOBMOND_CONF ):

        print "Is not a file or does not exist: '%s'" %JOBMOND_CONF
        sys.exit( 1 )

    try:
        f = open( JOBMOND_CONF, 'r' )
    except IOError, detail:
        print "Cannot read config file: '%s'" %JOBMOND_CONF
        sys.exit( 1 )
    else:
        f.close()

    cfg        = ConfigParser.ConfigParser()

    cfg.read( filename )

    global DEBUG_LEVEL, DAEMONIZE, BATCH_SERVER, BATCH_POLL_INTERVAL
    global GMOND_CONF, DETECT_TIME_DIFFS, BATCH_HOST_TRANSLATE
    global BATCH_API, QUEUE, GMETRIC_TARGET, USE_SYSLOG
    global SYSLOG_LEVEL, SYSLOG_FACILITY, GMETRIC_BINARY
    global METRIC_MAX_VAL_LEN, GMOND_UDP_SEND_CHANNELS

    DEBUG_LEVEL = cfg.getint( 'DEFAULT', 'DEBUG_LEVEL' )

    DAEMONIZE   = cfg.getboolean( 'DEFAULT', 'DAEMONIZE' )

    SYSLOG_LEVEL    = -1
    SYSLOG_FACILITY = None

    try:
        USE_SYSLOG  = cfg.getboolean( 'DEFAULT', 'USE_SYSLOG' )

    except ConfigParser.NoOptionError:

        USE_SYSLOG  = True

        debug_msg( 0, 'ERROR: no option USE_SYSLOG found: assuming yes' )

    if USE_SYSLOG:

        try:
            SYSLOG_LEVEL = cfg.getint( 'DEFAULT', 'SYSLOG_LEVEL' )

        except ConfigParser.NoOptionError:

            debug_msg( 0, 'ERROR: no option SYSLOG_LEVEL found: assuming level 0' )
            SYSLOG_LEVEL = 0

        try:

            SYSLOG_FACILITY = eval( 'syslog.LOG_' + cfg.get( 'DEFAULT', 'SYSLOG_FACILITY' ) )

        except ConfigParser.NoOptionError:

            SYSLOG_FACILITY = syslog.LOG_DAEMON

            debug_msg( 0, 'ERROR: no option SYSLOG_FACILITY found: assuming facility DAEMON' )

    try:

        BATCH_SERVER = cfg.get( 'DEFAULT', 'BATCH_SERVER' )

    except ConfigParser.NoOptionError:

        # Backwards compatibility for old configs
        #

        BATCH_SERVER = cfg.get( 'DEFAULT', 'TORQUE_SERVER' )
        api_guess    = 'pbs'
    
    try:
    
        BATCH_POLL_INTERVAL = cfg.getint( 'DEFAULT', 'BATCH_POLL_INTERVAL' )

    except ConfigParser.NoOptionError:

        # Backwards compatibility for old configs
        #

        BATCH_POLL_INTERVAL = cfg.getint( 'DEFAULT', 'TORQUE_POLL_INTERVAL' )
        api_guess           = 'pbs'
    
    try:

        GMOND_CONF          = cfg.get( 'DEFAULT', 'GMOND_CONF' )

    except ConfigParser.NoOptionError:

        # Not specified: assume /etc/ganglia/gmond.conf
        #
        GMOND_CONF          = '/etc/ganglia/gmond.conf'

    ganglia_cfg             = GangliaConfigParser( GMOND_CONF )
    GMETRIC_TARGET          = None

    GMOND_UDP_SEND_CHANNELS = ganglia_cfg.getUdpSendChannels()

    if not GMOND_UDP_SEND_CHANNELS:

        debug_msg( 0, "WARNING: Can't parse udp_send_channel from: '%s' - Trying: %s" %( GMOND_CONF, JOBMOND_CONF ) )

        # Couldn't figure it out: let's see if it's in our jobmond.conf
        #
        try:

            GMETRIC_TARGET    = cfg.get( 'DEFAULT', 'GMETRIC_TARGET' )

        # Guess not: now just give up
        
        except ConfigParser.NoOptionError:

            GMETRIC_TARGET    = None

            debug_msg( 0, "ERROR: GMETRIC_TARGET not set: internal Gmetric handling aborted. Failing back to DEPRECATED use of gmond.conf/gmetric binary. This will slow down jobmond significantly!" )

            gmetric_bin    = findGmetric()

            if gmetric_bin:

                GMETRIC_BINARY     = gmetric_bin
            else:
                debug_msg( 0, "WARNING: Can't find gmetric binary anywhere in $PATH" )

                try:

                    GMETRIC_BINARY = cfg.get( 'DEFAULT', 'GMETRIC_BINARY' )

                except ConfigParser.NoOptionError:

                    debug_msg( 0, "FATAL ERROR: GMETRIC_BINARY not set and not in $PATH" )
                    sys.exit( 1 )

    #TODO: is this really still needed or should be automatic
    DETECT_TIME_DIFFS    = cfg.getboolean( 'DEFAULT', 'DETECT_TIME_DIFFS' )

    BATCH_HOST_TRANSLATE = getlist( cfg.get( 'DEFAULT', 'BATCH_HOST_TRANSLATE' ) )

    try:

        BATCH_API    = cfg.get( 'DEFAULT', 'BATCH_API' )

    except ConfigParser.NoOptionError, detail:

        if BATCH_SERVER and api_guess:

            BATCH_API    = api_guess
        else:
            debug_msg( 0, "FATAL ERROR: BATCH_API not set and can't make guess" )
            sys.exit( 1 )

    try:

        QUEUE        = getlist( cfg.get( 'DEFAULT', 'QUEUE' ) )

    except ConfigParser.NoOptionError, detail:

        QUEUE        = None

    METRIC_MAX_VAL_LEN = ganglia_cfg.getInt( 'globals', 'max_udp_msg_len' )

    return True

def fqdn_parts (fqdn):

    """Return pair of host and domain for fully-qualified domain name arg."""

    parts = fqdn.split (".")

    return (parts[0], string.join(parts[1:], "."))

class DataProcessor:

    """Class for processing of data"""

    binary = None

    def __init__( self, binary=None ):

        """Remember alternate binary location if supplied"""

        global GMETRIC_BINARY, GMOND_CONF

        if binary:
            self.binary = binary

        if not self.binary and not GMETRIC_TARGET and not GMOND_UDP_SEND_CHANNELS:
            self.binary = GMETRIC_BINARY

        # Timeout for XML
        #
        # From ganglia's documentation:
        #
        # 'A metric will be deleted DMAX seconds after it is received, and
        # DMAX=0 means eternal life.'

        self.dmax = str( int( int( BATCH_POLL_INTERVAL ) * 2 ) )

        if GMOND_CONF and not GMETRIC_TARGET and not GMOND_UDP_SEND_CHANNELS:

            incompatible = self.checkGmetricVersion()

            if incompatible:

                debug_msg( 0, 'Gmetric version not compatible, please upgrade to at least 3.4.0' )
                sys.exit( 1 )

    def checkGmetricVersion( self ):

        """
        Check version of gmetric is at least 3.4.0
        for the syntax we use
        """

        global METRIC_MAX_VAL_LEN, GMETRIC_TARGET

        incompatible    = 0

        gfp        = os.popen( self.binary + ' --version' )
        lines      = gfp.readlines()

        gfp.close()

        for line in lines:

            line = line.split( ' ' )

            if len( line ) == 2 and str( line ).find( 'gmetric' ) != -1:
            
                gmetric_version    = line[1].split( '\n' )[0]

                version_major    = int( gmetric_version.split( '.' )[0] )
                version_minor    = int( gmetric_version.split( '.' )[1] )
                version_patch    = int( gmetric_version.split( '.' )[2] )

                incompatible    = 0

                if version_major < 3:

                    incompatible = 1
                
                elif version_major == 3:

                    if version_minor < 4:

                        incompatible = 1

        return incompatible

    def multicastGmetric( self, metricname, metricval, valtype='string', units='' ):

        """Call gmetric binary and multicast"""

        cmd = self.binary

        if GMOND_UDP_SEND_CHANNELS:

            for c_ip, c_port  in GMOND_UDP_SEND_CHANNELS:

                metric_debug        = "[gmetric %s:%s] name: %s - val: %s - dmax: %s" %( str(c_ip), str(c_port), str( metricname ), str( metricval ), str( self.dmax ) )

                debug_msg( 10, printTime() + ' ' + metric_debug)

                gm = Gmetric( c_ip, c_port )

                gm.send( str( metricname ), str( metricval ), str( self.dmax ), valtype, units )

        elif GMETRIC_TARGET:

            GMETRIC_TARGET_HOST    = GMETRIC_TARGET.split( ':' )[0]
            GMETRIC_TARGET_PORT    = GMETRIC_TARGET.split( ':' )[1]

            metric_debug        = "[gmetric] name: %s - val: %s - dmax: %s" %( str( metricname ), str( metricval ), str( self.dmax ) )

            debug_msg( 10, printTime() + ' ' + metric_debug)

            gm = Gmetric( GMETRIC_TARGET_HOST, GMETRIC_TARGET_PORT )

            gm.send( str( metricname ), str( metricval ), str( self.dmax ), valtype, units )

        else:
            try:
                cmd = cmd + ' -c' + GMOND_CONF

            except NameError:

                debug_msg( 10, 'Assuming /etc/ganglia/gmond.conf for gmetric cmd' )

            cmd = cmd + ' -n' + str( metricname )+ ' -v"' + str( metricval )+ '" -t' + str( valtype ) + ' -d' + str( self.dmax )

            if len( units ) > 0:

                cmd = cmd + ' -u"' + units + '"'

            debug_msg( 10, printTime() + ' ' + cmd )

            os.system( cmd )

class DataGatherer:

    """Skeleton class for batch system DataGatherer"""

    def printJobs( self, jobs ):

        """Print a jobinfo overview"""

        for name, attrs in self.jobs.items():

            print 'job %s' %(name)

            for name, val in attrs.items():

                print '\t%s = %s' %( name, val )

    def printJob( self, jobs, job_id ):

        """Print job with job_id from jobs"""

        print 'job %s' %(job_id)

        for name, val in jobs[ job_id ].items():

            print '\t%s = %s' %( name, val )

    def getAttr( self, attrs, name ):

        """Return certain attribute from dictionary, if exists"""

        if attrs.has_key( name ):

            return attrs[ name ]
        else:
            return ''

    def jobDataChanged( self, jobs, job_id, attrs ):

        """Check if job with attrs and job_id in jobs has changed"""

        if jobs.has_key( job_id ):

            oldData = jobs[ job_id ]    
        else:
            return 1

        for name, val in attrs.items():

            if oldData.has_key( name ):

                if oldData[ name ] != attrs[ name ]:

                    return 1

            else:
                return 1

        return 0

    def submitJobData( self ):

        """Submit job info list"""

        global BATCH_API

        self.dp.multicastGmetric( 'zplugin_monarch_heartbeat', str( int( int( self.cur_time ) + int( self.timeoffset ) ) ) )

        running_jobs = 0
        queued_jobs  = 0

        # Count how many running/queued jobs we found
        #
        for jobid, jobattrs in self.jobs.items():

            if jobattrs[ 'status' ] == 'Q':

                queued_jobs += 1

            elif jobattrs[ 'status' ] == 'R':

                running_jobs += 1

        # Report running/queued jobs as seperate metric for a nice RRD graph
        #
        self.dp.multicastGmetric( 'zplugin_monarch_rj', str( running_jobs ), 'uint32', 'jobs' )
        self.dp.multicastGmetric( 'zplugin_monarch_qj', str( queued_jobs ), 'uint32', 'jobs' )

        # Report down/offline nodes in batch (PBS only ATM)
        #
        if BATCH_API == 'pbs':

            domain        = fqdn_parts( socket.getfqdn() )[1]

            downed_nodes  = list()
            offline_nodes = list()
        
            l        = ['state']
        
            for name, node in self.pq.getnodes().items():

                if ( node[ 'state' ].find( "down" ) != -1 ):

                    downed_nodes.append( name )

                if ( node[ 'state' ].find( "offline" ) != -1 ):

                    offline_nodes.append( name )

            downnodeslist    = do_nodelist( downed_nodes )
            offlinenodeslist = do_nodelist( offline_nodes )

            down_str    = 'nodes=%s domain=%s reported=%s' %( string.join( downnodeslist, ';' ), domain, str( int( int( self.cur_time ) + int( self.timeoffset ) ) ) )
            offl_str    = 'nodes=%s domain=%s reported=%s' %( string.join( offlinenodeslist, ';' ), domain, str( int( int( self.cur_time ) + int( self.timeoffset ) ) ) )
            self.dp.multicastGmetric( 'zplugin_monarch_down'   , down_str )
            self.dp.multicastGmetric( 'zplugin_monarch_offline', offl_str )

        # Now let's spread the knowledge
        #
        for jobid, jobattrs in self.jobs.items():

            # Make gmetric values for each job: respect max gmetric value length
            #
            gmetric_val        = self.compileGmetricVal( jobid, jobattrs )
            metric_increment    = 0

            # If we have more job info than max gmetric value length allows, split it up
            # amongst multiple metrics
            #
            for val in gmetric_val:

                metric_name = 'zplugin_monarch_job_%s_%s' %( str(metric_increment) , str( jobid ) )
                self.dp.multicastGmetric( metric_name, val )

                # Increase follow number if this jobinfo is split up amongst more than 1 gmetric
                #
                metric_increment    = metric_increment + 1

    def compileGmetricVal( self, jobid, jobattrs ):

        """Create a val string for gmetric of jobinfo"""

        gval_lists    = [ ]
        val_list    = { }

        for val_name, val_value in jobattrs.items():

            # These are our own metric names, i.e.: status, start_timestamp, etc
            #
            val_list_names_len    = len( string.join( val_list.keys() ) ) + len(val_list.keys())

            # These are their corresponding values
            #
            val_list_vals_len    = len( string.join( val_list.values() ) ) + len(val_list.values())

            if val_name == 'nodes' and jobattrs['status'] == 'R':

                node_str = None

                for node in val_value:

                    if node_str:

                        node_str = node_str + ';' + node
                    else:
                        node_str = node

                    # Make sure if we add this new info, that the total metric's value length does not exceed METRIC_MAX_VAL_LEN
                    #
                    if (val_list_names_len + len(val_name) ) + (val_list_vals_len + len(node_str) ) > METRIC_MAX_VAL_LEN:

                        # It's too big, we need to make a new gmetric for the additional info
                        #
                        val_list[ val_name ]    = node_str

                        gval_lists.append( val_list )

                        val_list        = { }
                        node_str        = None

                val_list[ val_name ]    = node_str

                gval_lists.append( val_list )

                val_list        = { }

            elif val_value != '':

                # Make sure if we add this new info, that the total metric's value length does not exceed METRIC_MAX_VAL_LEN
                #
                if (val_list_names_len + len(val_name) ) + (val_list_vals_len + len(str(val_value)) ) > METRIC_MAX_VAL_LEN:

                    # It's too big, we need to make a new gmetric for the additional info
                    #
                    gval_lists.append( val_list )

                    val_list        = { }

                val_list[ val_name ]    = val_value

        if len( val_list ) > 0:

            gval_lists.append( val_list )

        str_list    = [ ]

        # Now append the value names and values together, i.e.: stop_timestamp=value, etc
        #
        for val_list in gval_lists:

            my_val_str    = None

            for val_name, val_value in val_list.items():

                if type(val_value) == list:

                    val_value    = val_value.join( ',' )

                if my_val_str:

                    try:
                        # fixme: It's getting
                        # ('nodes', None) items
                        my_val_str = my_val_str + ' ' + val_name + '=' + val_value
                    except:
                        pass

                else:
                    my_val_str = val_name + '=' + val_value

            str_list.append( my_val_str )

        return str_list

    def daemon( self ):

        """Run as daemon forever"""

        # Fork the first child
        #
        pid = os.fork()
        if pid > 0:
            sys.exit(0)  # end parent

        # creates a session and sets the process group ID
        #
        os.setsid()

        # Fork the second child
        #
        pid = os.fork()
        if pid > 0:
            sys.exit(0)  # end parent

        write_pidfile()

        # Go to the root directory and set the umask
        #
        os.chdir('/')
        os.umask(0)

        sys.stdin.close()
        sys.stdout.close()
        sys.stderr.close()

        os.open('/dev/null', os.O_RDWR)
        os.dup2(0, 1)
        os.dup2(0, 2)

        self.run()

    def run( self ):

        """Main thread"""

        while ( 1 ):
        
            self.getJobData()
            self.submitJobData()
            time.sleep( BATCH_POLL_INTERVAL )    

# SGE code by Dave Love <fx@gnu.org>.  Tested with SGE 6.0u8 and 6.0u11.  May
# work with SGE 6.1 (else should be easily fixable), but definitely doesn't
# with 6.2.  See also the fixmes.

class NoJobs (Exception):
    """Exception raised by empty job list in qstat output."""
    pass

class SgeQstatXMLParser(xml.sax.handler.ContentHandler):
    """SAX handler for XML output from Sun Grid Engine's `qstat'."""

    def __init__(self):
        self.value = ""
        self.joblist = []
        self.job = {}
        self.queue = ""
        self.in_joblist = False
        self.lrequest = False
        self.eltq = deque()
        xml.sax.handler.ContentHandler.__init__(self)

    # The structure of the output is as follows (for SGE 6.0).  It's
    # similar for 6.1, but radically different for 6.2, and is
    # undocumented generally.  Unfortunately it's voluminous, and probably
    # doesn't scale to large clusters/queues.

    # <detailed_job_info  xmlns:xsd="http://www.w3.org/2001/XMLSchema">
    #   <djob_info>
    #     <qmaster_response>  <!-- job -->
    #       ...
    #       <JB_ja_template>  
    #     <ulong_sublist>
    #     ...         <!-- start_time, state ... -->
    #     </ulong_sublist>
    #       </JB_ja_template>  
    #       <JB_ja_tasks>
    #     <ulong_sublist>
    #       ...       <!-- task info
    #     </ulong_sublist>
    #     ...
    #       </JB_ja_tasks>
    #       ...
    #     </qmaster_response>
    #   </djob_info>
    #   <messages>
    #   ...

    # NB.  We might treat each task as a separate job, like
    # straight qstat output, but the web interface expects jobs to
    # be identified by integers, not, say, <job number>.<task>.

    # So, I lied.  If the job list is empty, we get invalid XML
    # like this, which we need to defend against:

    # <unknown_jobs  xmlns:xsd="http://www.w3.org/2001/XMLSchema">
    #   <>
    #     <ST_name>*</ST_name>
    #   </>
    # </unknown_jobs>

    def startElement(self, name, attrs):
        self.value = ""
        if name == "djob_info":    # job list
            self.in_joblist = True
        # The job container is "qmaster_response" in SGE 6.0
        # and 6.1, but "element" in 6.2.  This is only the very
        # start of what's necessary for 6.2, though (sigh).
        elif (name == "qmaster_response" or name == "element") \
                and self.eltq[-1] == "djob_info": # job
            self.job = {"job_state": "U", "slots": 0,
                    "nodes": [], "queued_timestamp": "",
                    "queued_timestamp": "", "queue": "",
                    "ppn": "0", "RN_max": 0,
                    # fixme in endElement
                    "requested_memory": 0, "requested_time": 0
                    }
            self.joblist.append(self.job)
        elif name == "qstat_l_requests": # resource request
            self.lrequest = True
        elif name == "unknown_jobs":
            raise NoJobs
        self.eltq.append (name)

    def characters(self, ch):
        self.value += ch

    def endElement(self, name): 
        """Snarf job elements contents into job dictionary.
           Translate keys if appropriate."""

        name_trans = {
          "JB_job_number": "number",
          "JB_job_name": "name", "JB_owner": "owner",
          "queue_name": "queue", "JAT_start_time": "start_timestamp",
          "JB_submission_time": "queued_timestamp"
          }
        value = self.value
        self.eltq.pop ()

        if name == "djob_info":
            self.in_joblist = False
            self.job = {}
        elif name == "JAT_master_queue":
            self.job["queue"] = value.split("@")[0]
        elif name == "JG_qhostname":
            if not (value in self.job["nodes"]):
                self.job["nodes"].append(value)
        elif name == "JG_slots": # slots in use
            self.job["slots"] += int(value)
        elif name == "RN_max": # requested slots (tasks or parallel)
            self.job["RN_max"] = max (self.job["RN_max"],
                          int(value))
        elif name == "JAT_state": # job state (bitwise or)
            value = int (value)
            # Status values from sge_jobL.h
            #define JIDLE           0x00000000
            #define JHELD           0x00000010
            #define JMIGRATING          0x00000020
            #define JQUEUED         0x00000040
            #define JRUNNING        0x00000080
            #define JSUSPENDED          0x00000100
            #define JTRANSFERING        0x00000200
            #define JDELETED        0x00000400
            #define JWAITING        0x00000800
            #define JEXITING        0x00001000
            #define JWRITTEN        0x00002000
            #define JSUSPENDED_ON_THRESHOLD 0x00010000
            #define JFINISHED           0x00010000
            if value & 0x80:
                self.job["status"] = "R"
            elif value & 0x40:
                self.job["status"] = "Q"
            else:
                self.job["status"] = "O" # `other'
        elif name == "CE_name" and self.lrequest and self.value in \
                ("h_cpu", "s_cpu", "cpu", "h_core", "s_core"):
            # We're in a container for an interesting resource
            # request; record which type.
            self.lrequest = self.value
        elif name == "CE_doubleval" and self.lrequest:
            # if we're in a container for an interesting
            # resource request, use the maxmimum of the hard
            # and soft requests to record the requested CPU
            # or core.  Fixme:  I'm not sure if this logic is
            # right.
            if self.lrequest in ("h_core", "s_core"):
                self.job["requested_memory"] = \
                    max (float (value),
                     self.job["requested_memory"])
            # Fixme:  Check what cpu means, c.f [hs]_cpu.
            elif self.lrequest in ("h_cpu", "s_cpu", "cpu"):
                self.job["requested_time"] = \
                    max (float (value),
                     self.job["requested_time"])
        elif name == "qstat_l_requests":
            self.lrequest = False
        elif self.job and self.in_joblist:
            if name in name_trans:
                name = name_trans[name]
                self.job[name] = value

# Abstracted from PBS original.
# Fixme:  Is it worth (or appropriate for PBS) sorting the result?
#
def do_nodelist( nodes ):

    """Translate node list as appropriate."""

    nodeslist        = [ ]
    my_domain        = fqdn_parts( socket.getfqdn() )[1]

    for node in nodes:

        host        = node.split( '/' )[0] # not relevant for SGE
        h, host_domain    = fqdn_parts(host)

        if host_domain == my_domain:

            host    = h

        if nodeslist.count( host ) == 0:

            for translate_pattern in BATCH_HOST_TRANSLATE:

                if translate_pattern.find( '/' ) != -1:

                    translate_orig    = \
                        translate_pattern.split( '/' )[1]
                    translate_new    = \
                        translate_pattern.split( '/' )[2]
                    host = re.sub( translate_orig,
                               translate_new, host )
            if not host in nodeslist:
                nodeslist.append( host )
    return nodeslist

class SgeDataGatherer(DataGatherer):

    jobs = {}

    def __init__( self ):
        self.jobs = {}
        self.timeoffset = 0
        self.dp = DataProcessor()

    def getJobData( self ):
        """Gather all data on current jobs in SGE"""

        import popen2

        self.cur_time = 0
        queues = ""
        if QUEUE:    # only for specific queues
            # Fixme:  assumes queue names don't contain single
            # quote or comma.  Don't know what the SGE rules are.
            queues = " -q '" + string.join (QUEUE, ",") + "'"
        # Note the comment in SgeQstatXMLParser about scaling with
        # this method of getting data.  I haven't found better one.
        # Output with args `-xml -ext -f -r' is easier to parse
        # in some ways, harder in others, but it doesn't provide
        # the submission time (at least SGE 6.0).  The pipeline
        # into sed corrects bogus XML observed with a configuration
        # of SGE 6.0u8, which otherwise causes the parsing to hang.
        piping = popen2.Popen3("qstat -u '*' -j '*' -xml | \
sed -e 's/reported usage>/reported_usage>/g' -e 's;<\/*JATASK:.*>;;'" \
                           + queues, True)
        qstatparser = SgeQstatXMLParser()
        parse_err = 0
        try:
            xml.sax.parse(piping.fromchild, qstatparser)
        except NoJobs:
            pass
        except:
            parse_err = 1
        if piping.wait():
            debug_msg(10, "qstat error, skipping until next polling interval: " + piping.childerr.readline())
            return None
        elif parse_err:
            debug_msg(10, "Bad XML output from qstat"())
            exit (1)
        for f in piping.fromchild, piping.tochild, piping.childerr:
            f.close()
        self.cur_time = time.time()
        jobs_processed = []
        for job in qstatparser.joblist:
            job_id = job["number"]
            if job["status"] in [ 'Q', 'R' ]:
                jobs_processed.append(job_id)
            if job["status"] == "R":
                job["nodes"] = do_nodelist (job["nodes"])
                # Fixme: why is job["nodes"] sometimes null?
                try:
                    # Fixme: Is this sensible?  The
                    # PBS-type PPN isn't something you use
                    # with SGE.
                    job["ppn"] = float(job["slots"]) / len(job["nodes"])
                except:
                    job["ppn"] = 0
                if DETECT_TIME_DIFFS:
                    # If a job start is later than our
                    # current date, that must mean
                    # the SGE server's time is later
                    # than our local time.
                    start_timestamp = int (job["start_timestamp"])
                    if start_timestamp > int(self.cur_time) + int(self.timeoffset):

                        self.timeoffset    = start_timestamp - int(self.cur_time)
            else:
                # fixme: Note sure what this should be:
                job["ppn"] = job["RN_max"]
                job["nodes"] = "1"

            myAttrs = {}
            for attr in ["name", "queue", "owner",
                     "requested_time", "status",
                     "requested_memory", "ppn",
                     "start_timestamp", "queued_timestamp"]:
                myAttrs[attr] = str(job[attr])
            myAttrs["nodes"] = job["nodes"]
            myAttrs["reported"] = str(int(self.cur_time) + int(self.timeoffset))
            myAttrs["domain"] = fqdn_parts(socket.getfqdn())[1]
            myAttrs["poll_interval"] = str(BATCH_POLL_INTERVAL)

            if self.jobDataChanged(self.jobs, job_id, myAttrs) and myAttrs["status"] in ["R", "Q"]:
                self.jobs[job_id] = myAttrs
        for id, attrs in self.jobs.items():
            if id not in jobs_processed:
                del self.jobs[id]

# LSF code by Mahmoud Hanafi <hanafim@users.sourceforge.nt>
# Requres LSFObject http://sourceforge.net/projects/lsfobject
#
class LsfDataGatherer(DataGatherer):

    """This is the DataGatherer for LSf"""

    global lsfObject

    def __init__( self ):

        self.jobs = { }
        self.timeoffset = 0
        self.dp = DataProcessor()
        self.initLsfQuery()

    def _countDuplicatesInList( self, dupedList ):

        countDupes    = { }

        for item in dupedList:

            if not countDupes.has_key( item ):

                countDupes[ item ]    = 1
            else:
                countDupes[ item ]    = countDupes[ item ] + 1

        dupeCountList    = [ ]

        for item, count in countDupes.items():

            dupeCountList.append( ( item, count ) )

        return dupeCountList
#
#lst = ['I1','I2','I1','I3','I4','I4','I7','I7','I7','I7','I7']
#print _countDuplicatesInList(lst)
#[('I1', 2), ('I3', 1), ('I2', 1), ('I4', 2), ('I7', 5)]
########################

    def initLsfQuery( self ):
        self.pq = None
        self.pq = lsfObject.jobInfoEntObject()

    def getJobData( self, known_jobs="" ):
        """Gather all data on current jobs in LSF"""
        if len( known_jobs ) > 0:
            jobs = known_jobs
        else:
            jobs = { }
        joblist = {}
        joblist = self.pq.getJobInfo()
        nodelist = ''

        self.cur_time = time.time()

        jobs_processed = [ ]

        for name, attrs in joblist.items():
            job_id = str(name)
            jobs_processed.append( job_id )
            name = self.getAttr( attrs, 'jobName' )
            queue = self.getAttr( self.getAttr( attrs, 'submit') , 'queue' )
            owner = self.getAttr( attrs, 'user' )

### THIS IS THE rLimit List index values
#define LSF_RLIMIT_CPU      0        /* cpu time in milliseconds */
#define LSF_RLIMIT_FSIZE    1        /* maximum file size */
#define LSF_RLIMIT_DATA     2        /* data size */
#define LSF_RLIMIT_STACK    3        /* stack size */
#define LSF_RLIMIT_CORE     4        /* core file size */
#define LSF_RLIMIT_RSS      5        /* resident set size */
#define LSF_RLIMIT_NOFILE   6        /* open files */
#define LSF_RLIMIT_OPEN_MAX 7        /* (from HP-UX) */
#define LSF_RLIMIT_VMEM     8        /* maximum swap mem */
#define LSF_RLIMIT_SWAP     8
#define LSF_RLIMIT_RUN      9        /* max wall-clock time limit */
#define LSF_RLIMIT_PROCESS  10       /* process number limit */
#define LSF_RLIMIT_THREAD   11       /* thread number limit (introduced in LSF6.0) */
#define LSF_RLIM_NLIMITS    12       /* number of resource limits */

            requested_time = self.getAttr( self.getAttr( attrs, 'submit') , 'rLimits' )[9]
            if requested_time == -1: 
                requested_time = ""
            requested_memory = self.getAttr( self.getAttr( attrs, 'submit') , 'rLimits' )[8]
            if requested_memory == -1: 
                requested_memory = ""
# This tries to get proc per node. We don't support this right now
            ppn = 0 #self.getAttr( self.getAttr( attrs, 'SubmitList') , 'numProessors' )
            requested_cpus = self.getAttr( self.getAttr( attrs, 'submit') , 'numProcessors' )
            if requested_cpus == None or requested_cpus == "":
                requested_cpus = 1

            if QUEUE:
                for q in QUEUE:
                    if q == queue:
                        display_queue = 1
                        break
                    else:
                        display_queue = 0
                        continue
            if display_queue == 0:
                continue

            runState = self.getAttr( attrs, 'status' )
            if runState == 4:
                status = 'R'
            else:
                status = 'Q'
            queued_timestamp = self.getAttr( attrs, 'submitTime' )

            if status == 'R':
                start_timestamp = self.getAttr( attrs, 'startTime' )
                nodesCpu =  dict(self._countDuplicatesInList(self.getAttr( attrs, 'exHosts' )))
                nodelist = nodesCpu.keys()

                if DETECT_TIME_DIFFS:

                    # If a job start if later than our current date,
                    # that must mean the Torque server's time is later
                    # than our local time.

                    if int(start_timestamp) > int( int(self.cur_time) + int(self.timeoffset) ):

                        self.timeoffset = int( int(start_timestamp) - int(self.cur_time) )

            elif status == 'Q':
                start_timestamp = ''
                count_mynodes = 0
                numeric_node = 1
                nodelist = ''

            myAttrs = { }
            if name == "":
                myAttrs['name'] = "none"
            else:
                myAttrs['name'] = name

            myAttrs[ 'owner' ]        = owner
            myAttrs[ 'requested_time' ]    = str(requested_time)
            myAttrs[ 'requested_memory' ]    = str(requested_memory)
            myAttrs[ 'requested_cpus' ]    = str(requested_cpus)
            myAttrs[ 'ppn' ]        = str( ppn )
            myAttrs[ 'status' ]        = status
            myAttrs[ 'start_timestamp' ]    = str(start_timestamp)
            myAttrs[ 'queue' ]        = str(queue)
            myAttrs[ 'queued_timestamp' ]    = str(queued_timestamp)
            myAttrs[ 'reported' ]        = str( int( int( self.cur_time ) + int( self.timeoffset ) ) )
            myAttrs[ 'nodes' ]        = do_nodelist( nodelist )
            myAttrs[ 'domain' ]        = fqdn_parts( socket.getfqdn() )[1]
            myAttrs[ 'poll_interval' ]    = str(BATCH_POLL_INTERVAL)

            if self.jobDataChanged( jobs, job_id, myAttrs ) and myAttrs['status'] in [ 'R', 'Q' ]:
                jobs[ job_id ] = myAttrs

                debug_msg( 10, printTime() + ' job %s state changed' %(job_id) )

        for id, attrs in jobs.items():
            if id not in jobs_processed:
                # This one isn't there anymore
                #
                del jobs[ id ]
        self.jobs=jobs


class PbsDataGatherer( DataGatherer ):

    """This is the DataGatherer for PBS and Torque"""

    global PBSQuery, PBSError

    def __init__( self ):

        """Setup appropriate variables"""

        self.jobs    = { }
        self.timeoffset    = 0
        self.dp        = DataProcessor()

        self.initPbsQuery()

    def initPbsQuery( self ):

        self.pq        = None

        if( BATCH_SERVER ):

            self.pq        = PBSQuery( BATCH_SERVER )
        else:
            self.pq        = PBSQuery()

        try:
            self.pq.old_data_structure()

        except AttributeError:

            # pbs_query is older
            #
            pass

    def getJobData( self ):

        """Gather all data on current jobs in Torque"""

        joblist        = {}
        self.cur_time    = 0

        try:
            joblist        = self.pq.getjobs()
            self.cur_time    = time.time()

        except PBSError, detail:

            debug_msg( 10, "Caught PBS unavailable, skipping until next polling interval: " + str( detail ) )
            return None

        jobs_processed    = [ ]

        for name, attrs in joblist.items():
            display_queue        = 1
            job_id            = name.split( '.' )[0]

            name            = self.getAttr( attrs, 'Job_Name' )
            queue            = self.getAttr( attrs, 'queue' )

            if QUEUE:
                for q in QUEUE:
                    if q == queue:
                        display_queue = 1
                        break
                    else:
                        display_queue = 0
                        continue
            if display_queue == 0:
                continue


            owner            = self.getAttr( attrs, 'Job_Owner' ).split( '@' )[0]
            requested_time        = self.getAttr( attrs, 'Resource_List.walltime' )
            requested_memory    = self.getAttr( attrs, 'Resource_List.mem' )

            mynoderequest        = self.getAttr( attrs, 'Resource_List.nodes' )

            ppn            = ''

            if mynoderequest.find( ':' ) != -1 and mynoderequest.find( 'ppn' ) != -1:

                mynoderequest_fields    = mynoderequest.split( ':' )

                for mynoderequest_field in mynoderequest_fields:

                    if mynoderequest_field.find( 'ppn' ) != -1:

                        ppn    = mynoderequest_field.split( 'ppn=' )[1]

            status            = self.getAttr( attrs, 'job_state' )

            if status in [ 'Q', 'R' ]:

                jobs_processed.append( job_id )

            queued_timestamp    = self.getAttr( attrs, 'ctime' )

            if status == 'R':

                start_timestamp        = self.getAttr( attrs, 'mtime' )
                nodes            = self.getAttr( attrs, 'exec_host' ).split( '+' )

                nodeslist        = do_nodelist( nodes )

                if DETECT_TIME_DIFFS:

                    # If a job start if later than our current date,
                    # that must mean the Torque server's time is later
                    # than our local time.
                
                    if int( start_timestamp ) > int( int( self.cur_time ) + int( self.timeoffset ) ):

                        self.timeoffset    = int( int(start_timestamp) - int(self.cur_time) )

            elif status == 'Q':

                # 'mynodequest' can be a string in the following syntax according to the
                # Torque Administator's manual:
                # 
                # {<node_count> | <hostname>}[:ppn=<ppn>][:<property>[:<property>]...][+ ...]
                # {<node_count> | <hostname>}[:ppn=<ppn>][:<property>[:<property>]...][+ ...]
                # etc
                #

                #
                # For now we only count the amount of nodes request and ignore properties
                #

                start_timestamp        = ''
                count_mynodes        = 0

                for node in mynoderequest.split( '+' ):

                    # Just grab the {node_count|hostname} part and ignore properties
                    #
                    nodepart    = node.split( ':' )[0]

                    # Let's assume a node_count value
                    #
                    numeric_node    = 1

                    # Chop the value up into characters
                    #
                    for letter in nodepart:

                        # If this char is not a digit (0-9), this must be a hostname
                        #
                        if letter not in string.digits:

                            numeric_node    = 0

                    # If this is a hostname, just count this as one (1) node
                    #
                    if not numeric_node:

                        count_mynodes    = count_mynodes + 1
                    else:

                        # If this a number, it must be the node_count
                        # and increase our count with it's value
                        #
                        try:
                            count_mynodes    = count_mynodes + int( nodepart )

                        except ValueError, detail:

                            # When we arrive here I must be bugged or very confused
                            # THIS SHOULD NOT HAPPEN!
                            #
                            debug_msg( 10, str( detail ) )
                            debug_msg( 10, "Encountered weird node in Resources_List?!" )
                            debug_msg( 10, 'nodepart = ' + str( nodepart ) )
                            debug_msg( 10, 'job = ' + str( name ) )
                            debug_msg( 10, 'attrs = ' + str( attrs ) )
                        
                nodeslist    = str( count_mynodes )
            else:
                start_timestamp    = ''
                nodeslist    = ''

            myAttrs                = { }

            myAttrs[ 'name' ]        = str( name )
            myAttrs[ 'queue' ]        = str( queue )
            myAttrs[ 'owner' ]        = str( owner )
            myAttrs[ 'requested_time' ]    = str( requested_time )
            myAttrs[ 'requested_memory' ]    = str( requested_memory )
            myAttrs[ 'ppn' ]        = str( ppn )
            myAttrs[ 'status' ]        = str( status )
            myAttrs[ 'start_timestamp' ]    = str( start_timestamp )
            myAttrs[ 'queued_timestamp' ]    = str( queued_timestamp )
            myAttrs[ 'reported' ]        = str( int( int( self.cur_time ) + int( self.timeoffset ) ) )
            myAttrs[ 'nodes' ]        = nodeslist
            myAttrs[ 'domain' ]        = fqdn_parts( socket.getfqdn() )[1]
            myAttrs[ 'poll_interval' ]    = str( BATCH_POLL_INTERVAL )

            if self.jobDataChanged( self.jobs, job_id, myAttrs ) and myAttrs['status'] in [ 'R', 'Q' ]:

                self.jobs[ job_id ]    = myAttrs

        for id, attrs in self.jobs.items():

            if id not in jobs_processed:

                # This one isn't there anymore; toedeledoki!
                #
                del self.jobs[ id ]

GMETRIC_DEFAULT_TYPE    = 'string'
GMETRIC_DEFAULT_HOST    = '127.0.0.1'
GMETRIC_DEFAULT_PORT    = '8649'
GMETRIC_DEFAULT_UNITS   = ''

class Gmetric:

    global GMETRIC_DEFAULT_HOST, GMETRIC_DEFAULT_PORT

    slope           = { 'zero' : 0, 'positive' : 1, 'negative' : 2, 'both' : 3, 'unspecified' : 4 }
    type            = ( '', 'string', 'uint16', 'int16', 'uint32', 'int32', 'float', 'double', 'timestamp' )
    protocol        = ( 'udp', 'multicast' )

    def __init__( self, host=GMETRIC_DEFAULT_HOST, port=GMETRIC_DEFAULT_PORT ):
                
        global GMETRIC_DEFAULT_TYPE

        self.prot       = self.checkHostProtocol( host )
        self.data_msg   = xdrlib.Packer()
        self.meta_msg   = xdrlib.Packer()
        self.socket     = socket.socket( socket.AF_INET, socket.SOCK_DGRAM )

        if self.prot not in self.protocol:

            raise ValueError( "Protocol must be one of: " + str( self.protocol ) )

        if self.prot == 'multicast':

            # Set multicast options
            #
            self.socket.setsockopt( socket.IPPROTO_IP, socket.IP_MULTICAST_TTL, 20 )

        self.hostport   = ( host, int( port ) )
        self.slopestr   = 'both'
        self.tmax       = 60

    def checkHostProtocol( self, ip ):

        """Detect if a ip adress is a multicast address"""

        MULTICAST_ADDRESS_MIN   = ( "224", "0", "0", "0" )
        MULTICAST_ADDRESS_MAX   = ( "239", "255", "255", "255" )

        ip_fields               = ip.split( '.' )

        if ip_fields >= MULTICAST_ADDRESS_MIN and ip_fields <= MULTICAST_ADDRESS_MAX:

            return 'multicast'
        else:
            return 'udp'

    def send( self, name, value, dmax, typestr = '', units = '' ):

        if len( units ) == 0:
            units       = GMETRIC_DEFAULT_UNITS

        if len( typestr ) == 0:
            typestr     = GMETRIC_DEFAULT_TYPE

        (meta_msg, data_msg) = self.makexdr( name, value, typestr, units, self.slopestr, self.tmax, dmax )

        meta_rt = self.socket.sendto( meta_msg, self.hostport )
        data_rt = self.socket.sendto( data_msg, self.hostport )

        return ( meta_rt, data_rt )

    def makexdr( self, name, value, typestr, unitstr, slopestr, tmax, dmax, group=None, spoof=None ):

        hostname = "unset"

        if slopestr not in self.slope:

            raise ValueError( "Slope must be one of: " + str( self.slope.keys() ) )

        if typestr not in self.type:

            raise ValueError( "Type must be one of: " + str( self.type ) )

        if len( name ) == 0:

            raise ValueError( "Name must be non-empty" )

        self.meta_msg.reset()
        self.meta_msg.pack_int( 128 )

        if not spoof:
            self.meta_msg.pack_string( hostname )
        else:
            self.meta_msg.pack_string( spoof )

        self.meta_msg.pack_string( name )

        if not spoof:
            self.meta_msg.pack_int( 0 )
        else:
            self.meta_msg.pack_int( 1 )
            
        self.meta_msg.pack_string( typestr )
        self.meta_msg.pack_string( name )
        self.meta_msg.pack_string( unitstr )
        self.meta_msg.pack_int( self.slope[ slopestr ] )
        self.meta_msg.pack_uint( int( tmax ) )
        self.meta_msg.pack_uint( int( dmax ) )

        if not group:
            self.meta_msg.pack_int( 0 )
        else:
            self.meta_msg.pack_int( 1 )
            self.meta_msg.pack_string( "GROUP" )
            self.meta_msg.pack_string( group )

        self.data_msg.reset()
        self.data_msg.pack_int( 128+5 )

        if not spoof:
            self.data_msg.pack_string( hostname )
        else:
            self.data_msg.pack_string( spoof )

        self.data_msg.pack_string( name )

        if not spoof:
            self.data_msg.pack_int( 0 )
        else:
            self.data_msg.pack_int( 1 )

        self.data_msg.pack_string( "%s" )
        self.data_msg.pack_string( str( value ) )

        return ( self.meta_msg.get_buffer(), self.data_msg.get_buffer() )

def printTime( ):

    """Print current time/date in human readable format for log/debug"""

    return time.strftime("%a, %d %b %Y %H:%M:%S")

def debug_msg( level, msg ):

    """Print msg if at or above current debug level"""

    global DAEMONIZE, DEBUG_LEVEL, SYSLOG_LEVEL

    if (not DAEMONIZE and DEBUG_LEVEL >= level):
        sys.stderr.write( msg + '\n' )

    if (DAEMONIZE and USE_SYSLOG and SYSLOG_LEVEL >= level):
        syslog.syslog( msg )

def write_pidfile():

    # Write pidfile if PIDFILE is set
    #
    if PIDFILE:

        pid    = os.getpid()

        pidfile    = open( PIDFILE, 'w' )

        pidfile.write( str( pid ) )
        pidfile.close()

def main():

    """Application start"""

    global PBSQuery, PBSError, lsfObject
    global SYSLOG_FACILITY, USE_SYSLOG, BATCH_API, DAEMONIZE

    if not processArgs( sys.argv[1:] ):

        sys.exit( 1 )

    # Load appropriate DataGatherer depending on which BATCH_API is set
    # and any required modules for the Gatherer
    #
    if BATCH_API == 'pbs':

        try:
            from PBSQuery import PBSQuery, PBSError

        except ImportError:

            debug_msg( 0, "FATAL ERROR: BATCH_API set to 'pbs' but python module 'pbs_python' is not installed" )
            sys.exit( 1 )

        gather = PbsDataGatherer()

    elif BATCH_API == 'sge':

        # Tested with SGE 6.0u11.
        #
        gather = SgeDataGatherer()

    elif BATCH_API == 'lsf':

        try:
            from lsfObject import lsfObject
        except:
            debug_msg(0, "fatal error: BATCH_API set to 'lsf' but python module is not found or installed")
            sys.exit( 1)

        gather = LsfDataGatherer()

    else:
        debug_msg( 0, "FATAL ERROR: unknown BATCH_API '" + BATCH_API + "' is not supported" )

        sys.exit( 1 )

    if( DAEMONIZE and USE_SYSLOG ):

        syslog.openlog( 'jobmond', syslog.LOG_NOWAIT, SYSLOG_FACILITY )

    if DAEMONIZE:

        gather.daemon()
    else:
        gather.run()

# wh00t? someone started me! :)
#
if __name__ == '__main__':
    main()