#!/usr/bin/env python

'''Bcfg2 Client'''
__revision__ = '$Revision: 2401 $'

import logging, os, signal, tempfile, time, xmlrpclib
import Bcfg2.Options, Bcfg2.Client.XML, Bcfg2.Client.Frame

try:
    import Bcfg2.Client.Proxy, Bcfg2.Logging
except KeyError:
    print "Could not read options from configuration file"
    raise SystemExit, 1

def cb_sigint_handler(signum, frame):
    '''Exit upon CTRL-C'''
    os._exit(1)

class Client:
    ''' The main bcfg2 client class '''
    def __init__(self):
        self.toolset = None
        self.config = None

        optinfo = {
            # 'optname': (('-a', argdesc, optdesc),
            #                  env, cfpath, default, boolean)),
            'verbose':(('-v', False,"enable verbose output"),
                       False, False, False, True),
            'quick':(('-q', False, "disable some checksum verification"),
                     False, False, False, True),
            'debug':(('-d', False, "enable debugging output"),
                     False, False, False, True),
            'dryrun':(('-n', False, "do not actually change the system"),
                      False, False, False, True),
            'build': (('-B', False, "run in build mode"),
                      False, False, False, True),
            'paranoid':(('-P', False, "make automatic backups of config files"),
                        False, False, False, True),
            'bundle':(('-b', '<bundle>', "only configure the given bundle"),
                      False, False, False, False),
            'file': (('-f', "<configspec>", "configure from a file rather than querying the server"),
                     False, False, False, False),
            'interactive': (('-I', False, "prompt the user for each change"),
                      False, False, False, True),
            'cache': (('-c', "<configspec>", "store the configuration in a file"),
                      False, False, False, False),
            'profile': (('-p', '<profile>', "assert the given profile for the host"),
                        False, False, False, False),
            'remove': (('-r', '(packages|services|all)', "force removal of additional configuration items"),
                       False, False, False, False),
            'help': (('-h', False, "print this help message"),
                     False, False, False, True),
            'setup': (('-C', '<configfile>', "use given config file (default /etc/bcfg2.conf)"),
                      False, False, '/etc/bcfg2.conf', False),
            'server': (('-S', '<server url>', 'the server hostname to connect to'),
                       False, ('components', 'bcfg2'), 'https://localhost:6789', False),
            'user': (('-u', '<user>', 'the user to provide for authentication'),
                     False, ('communication', 'user'), 'root', False),
            'password': (('-x', '<password>', 'the password to provide for authentication'),
                         False, ('communication', 'password'), 'password', False),
            'retries': (('-R', '<numretries>', 'the number of times to retry network communication'),
                        False, ('communication', 'retries'), '3', False),
            'kevlar': (('-k', False, "run in kevlar (bulletproof) mode"),
                       False, False, False, True),
            }

        self.setup = Bcfg2.Options.OptionParser('bcfg2', optinfo).parse()
        level = 30
        if self.setup['verbose']:
            level = 20
        if self.setup['debug']:
            level = 0
        Bcfg2.Logging.setup_logging('bcfg2', to_syslog=False, level=level)
        self.logger = logging.getLogger('bcfg2')
        self.logger.debug(self.setup)
        if self.setup['remove'] not in [False, 'all', 'services', 'packages']:
            self.logger.error("Got unknown argument %s for -r" % (self.setup['remove']))
        if (self.setup["file"] != False) and (self.setup["cache"] != False):
            print "cannot use -f and -c together"
            raise SystemExit, 1
        if self.setup['remove'] and self.setup['dryrun']:
            print "cannot use -n and -r together"
            raise SystemExit, 1

    def run_probe(self, probe):
        '''Execute probe'''
        name = probe.get('name')
        ret = Bcfg2.Client.XML.Element("probe-data", name=name, source=probe.get('source'))
        try:
            script = open(tempfile.mktemp(), 'w+')
            try:
                script.write("#!%s\n" %
                             (probe.attrib.get('interpreter', '/bin/sh')))
                script.write(probe.text)
                script.close()
                os.chmod(script.name, 0755)             
                ret.text = os.popen(script.name).read().strip()
            finally:
                os.unlink(script.name)
        except:
            self.logger.error("Failed to execute probe: %s" % (name), exc_info=1)
            raise SystemExit, 1
        return ret

    def fatal_error(self, message):
        '''Signal a fatal error'''
        self.logger.error("Fatal error: %s" % (message))
        raise SystemExit, 1

    def get_config(self):
        '''Either download the config from the server or read it from file'''
        

    def run(self):
        ''' Perform client execution phase '''
        times = {}

        # begin configuration
        times['start'] = time.time()

        if self.setup['file']:
            # read config from file
            try:
                self.logger.debug("reading cached configuration from %s" %
                                  (self.setup['file']))
                configfile = open(self.setup['file'], 'r')
                rawconfig = configfile.read()
                configfile.close()
            except IOError:
                self.fatal_error("failed to read cached configuration from: %s"
                                 % (self.setup['file']))
        else:
            # retrieve config from server
            proxy = Bcfg2.Client.Proxy.bcfg2()

            if self.setup['profile']:
                try:
                    proxy.AssertProfile(self.setup['profile'])
                except xmlrpclib.Fault:
                    self.fatal_error("Failed to set client profile")

            try:
                probe_data = proxy.GetProbes()
            except xmlrpclib.Fault:
                self.logger.error("Failed to download probes from bcfg2")
                raise SystemExit, 1

            times['probe_download'] = time.time()
        
            try:
                probes = Bcfg2.Client.XML.XML(probe_data)
            except Bcfg2.Client.XML.ParseError, syntax_error:
                self.fatal_error(
                    "server returned invalid probe requests: %s" %
                    (syntax_error))
            
            # execute probes
            try:
                probedata = Bcfg2.Client.XML.Element("ProbeData")
                [probedata.append(self.run_probe(probe))
                 for probe in probes.findall(".//probe")]
            except:
                self.logger.error("Failed to Execute probes")
                raise SystemExit, 1

            if len(probes.findall(".//probe")) > 0:
                try:
                    # upload probe responses
                    proxy.RecvProbeData(Bcfg2.Client.XML.tostring(probedata))
                except:
                    self.logger.error("Failed to upload probe data", exc_info=1)
                    raise SystemExit, 1
        
            times['probe_upload'] = time.time()

            try:
                rawconfig = proxy.GetConfig()
            except xmlrpclib.Fault:
                self.logger.error("Failed to download configuration from bcfg2")
                raise SystemExit, 2

            times['config_download'] = time.time()

        if self.setup['cache']:
            try:
                open(self.setup['cache'], 'w').write(rawconfig)
                os.chmod(self.setup['cache'], 33152)
            except IOError:
                self.logger.warning("failed to write config cache file %s" %
                                    (self.setup['cache']))
            times['caching'] = time.time()
            
        try:
            self.config = Bcfg2.Client.XML.XML(rawconfig)
        except Bcfg2.Client.XML.ParseError, syntax_error:
            self.fatal_error("the configuration could not be parsed: %s" %
                             (syntax_error))

        times['config_parse'] = time.time()
    
        if self.config.tag == 'error':
            self.fatal_error("server error: %s" % (self.config.text))

        self.tools = Bcfg2.Client.Frame.Frame(self.config, self.setup, times)

        self.tools.Execute()

        if not self.setup['file']:
            # upload statistics
            feedback = self.tools.GenerateStats()

            try:
                proxy.RecvStats(Bcfg2.Client.XML.tostring(feedback))
            except xmlrpclib.Fault:
                self.logger.error("Failed to upload configuration statistics")
                raise SystemExit, 2

if __name__ == '__main__':
    signal.signal(signal.SIGINT, cb_sigint_handler)
    client = Client()
    client.run()
