#!/usr/bin/env python
# Jul 17 2005
#GenerateHostInfo - Joey Hagedorn - hagedorn@mcs.anl.gov

__revision__ = '$Revision$'
'''Generates hostinfo.xml at a regular interval'''

from ConfigParser import ConfigParser
from elementtree.ElementTree import *
from xml.parsers.expat import ExpatError
from os import system
from socket import gethostbyname, gethostbyaddr, gaierror

def buildfqdncache(domain_list, host_list):
    '''build dictionary of hostname to fqdns'''
    fqdncache = {}
    for nodename in host_list:
        fqdncache[nodename] = ""
        for domain in domain_list:
            try:
                fqdn = "%s.%s" % (nodename, domain)
                ipaddr = gethostbyname(fqdn)
                fqdncache[nodename] = fqdn
                break
            except gaierror:
                continue        
    return fqdncache

def pretty_print(element, level=0):
    '''Produce a pretty-printed text representation of element'''
    if element.text:
        fmt = "%s<%%s %%s>%%s</%%s>" % (level*" ")
        data = (element.tag, (" ".join(["%s='%s'" % keyval for keyval in element.attrib.iteritems()])),
                element.text, element.tag)
    if element._children:
        fmt = "%s<%%s %%s>\n" % (level*" ",) + (len(element._children) * "%s") + "%s</%%s>\n" % (level*" ")
        data = (element.tag, ) + (" ".join(["%s='%s'" % keyval for keyval in element.attrib.iteritems()]),)
        data += tuple([pretty_print(entry, level+2) for entry in element._children]) + (element.tag, )
    else:
        fmt = "%s<%%s %%s/>\n" % (level * " ")
        data = (element.tag, " ".join(["%s='%s'" % keyval for keyval in element.attrib.iteritems()]))
    return fmt % data

                                                                                                                
if __name__ == '__main__':
    c = ConfigParser()
    c.read(['/sandbox/hagedorn/bcfg2.conf'])
    hostinfopath = "%s/hostinfo.xml" % c.get('server', 'metadata')
    metadatapath = "%s/metadata.xml" % c.get('server', 'metadata')
    configpath = "%s/report-configuration.xml" % c.get('server', 'metadata')
    domainlist = c.get('statistics', 'domainlist').replace("\'","").split(",")
    sendmailpath = c.get('statistics','sendmailpath')
    
    metaElement =  parse(metadatapath)
    hostlist = map(lambda x:x.get("name"), metaElement.findall("Client"))

    fqdn_cache = buildfqdncache(domainlist, hostlist)


    HostInfo = Element("HostInformation")
    for host in hostlist:
        record = SubElement(HostInfo, "HostInfo",
                            attrib={"name" : host,"fqdn" : fqdn_cache[host]})
        if system( 'ping -c 1 ' + fqdn_cache[host] + ' &>/dev/null') != 0:
            record.set("pingable", 'N')
        else:
            record.set("pingable", 'Y')

    fout = open(hostinfopath, 'w')
    fout.write(pretty_print(HostInfo))
    fout.close()