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"""
LDTP v2 client

@author: Eitan Isaacson <eitan@ascender.com>
@author: Nagappan Alagappan <nagappan@gmail.com>
@copyright: Copyright (c) 2009 Eitan Isaacson
@copyright: Copyright (c) 2009-12 Nagappan Alagappan
@license: LGPL

http://ldtp.freedesktop.org

This file may be distributed and/or modified under the terms of the GNU Lesser General
Public License version 2 as published by the Free Software Foundation. This file
is distributed without any warranty; without even the implied warranty of 
merchantability or fitness for a particular purpose.

See 'COPYING' in the source distribution for more information.

Headers in this file shall remain intact.
"""

import os
import re
import sys
import time
import signal
import traceback
import xmlrpclib
import subprocess
import signal
from socket import error as SocketError
from client_exception import LdtpExecutionError, ERROR_CODE
from log import logger

_python25 = False
if sys.version_info[:2] <= (2, 5):
    _python25 = True
_ldtp_windows_env = False
if 'LDTP_DEBUG' in os.environ:
    _ldtp_debug = os.environ['LDTP_DEBUG']
else:
    _ldtp_debug = None
if 'LDTP_XML_DEBUG' in os.environ:
    verbose = 1
else:
    verbose = 0
if 'LDTP_SERVER_ADDR' in os.environ:
    _ldtp_server_addr = os.environ['LDTP_SERVER_ADDR']
else:
    _ldtp_server_addr = 'localhost'
if 'LDTP_SERVER_PORT' in os.environ:
    _ldtp_server_port = os.environ['LDTP_SERVER_PORT']
else:
    _ldtp_server_port = '4118'
if 'LDTP_WINDOWS' in os.environ or sys.platform.find('win') != -1:
    if 'LDTP_LINUX' in os.environ:
        _ldtp_windows_env = False
    else:
        _ldtp_windows_env = True
else:
   _ldtp_windows_env = False

class _Method(xmlrpclib._Method):
    def __call__(self, *args, **kwargs):
        if _ldtp_debug:
            logger.debug('%s(%s)' % (self.__name, \
                                         ', '.join(map(repr, args) + ['%s=%s' % (k, repr(v)) \
                                                                          for k, v in kwargs.items()])))
        args += (kwargs,)
        return self.__send(self.__name, args)

class Transport(xmlrpclib.Transport):
    def _handle_signal(self, signum, frame):
        if _ldtp_debug:
            if signum == signal.SIGCHLD:
                print "ldtpd exited!"
            elif signum == signal.SIGUSR1:
                print "SIGUSR1 received. ldtpd ready for requests."
            elif signum == signal.SIGALRM:
                print "SIGALRM received. Timeout waiting for SIGUSR1."

    def _spawn_daemon(self):
        pid = os.getpid()
        if _ldtp_windows_env:
            if _ldtp_debug:
                cmd = 'start cmd /K WinLdtpdService.exe'
            else:
                cmd = 'WinLdtpdService.exe'
            subprocess.Popen(cmd, shell = True)
            self._daemon = True
        else:
            pycmd = 'import ldtpd; ldtpd.main(parentpid=%s)' % pid
            self._daemon = os.spawnlp(os.P_NOWAIT, 'python',
                                      'python', '-c', pycmd)
    # http://www.itkovian.net/base/transport-class-for-pythons-xml-rpc-lib/
    ##
    # Connect to server.
    #
    # @param host Target host.
    # @return A connection handle.

    if not _python25:
        # Add to the class, only if > python 2.5
        def make_connection(self, host):
            # create a HTTP connection object from a host descriptor
            import httplib
            host, extra_headers, x509 = self.get_host_info(host)
            return httplib.HTTPConnection(host)
    ##
    # Send a complete request, and parse the response.
    #
    # @param host Target host.
    # @param handler Target PRC handler.
    # @param request_body XML-RPC request body.
    # @param verbose Debugging flag.
    # @return XML response.

    def request(self, host, handler, request_body, verbose=0):
        # issue XML-RPC request
        retry_count = 1
        while True:
            try:
                if _python25:
                    # Noticed this in Hutlab environment (Windows 7 SP1)
                    # Activestate python 2.5, use the old method
                    return xmlrpclib.Transport.request(
                        self, host, handler, request_body, verbose=verbose)
                # Follwing implementation not supported in Python <= 2.5
                # FIXME: Verify with Python 2.6
                h = self.make_connection(host)
                if verbose:
                    h.set_debuglevel(1)

                self.send_request(h, handler, request_body)
                self.send_host(h, host)
                self.send_user_agent(h)
                self.send_content(h, request_body)

                response = h.getresponse()

                if response.status != 200:
                    raise xmlrpclib.ProtocolError(host + handler, response.status,
                                        response.reason, response.msg.headers)

                payload = response.read()
                parser, unmarshaller = self.getparser()
                parser.feed(payload)
                parser.close()

                return unmarshaller.close()
            except SocketError, e:
                if ((_ldtp_windows_env and e[0] == 10061) or \
                        (not _ldtp_windows_env and (e.errno == 111 or \
                                                        e.errno == 146))) \
                        and 'localhost' in host:
                    if hasattr(self, 'close'):
                        # On Windows XP SP3 / Python 2.5, close doesn't exist
                        self.close()
                    if retry_count == 1:
                        retry_count += 1
                        if not _ldtp_windows_env:
                            sigusr1 = signal.signal(signal.SIGUSR1, self._handle_signal)
                            sigalrm = signal.signal(signal.SIGALRM, self._handle_signal)
                            sigchld = signal.signal(signal.SIGCHLD, self._handle_signal)
                        self._spawn_daemon()
                        if _ldtp_windows_env:
                            time.sleep(5)
                        else:
                            signal.alarm(15) # Wait 15 seconds for ldtpd
                            signal.pause()
                            # restore signal handlers
                            signal.alarm(0)
                            signal.signal(signal.SIGUSR1, sigusr1)
                            signal.signal(signal.SIGALRM, sigalrm)
                            signal.signal(signal.SIGCHLD, sigchld)
                        continue
                    else:
                        raise
                # else raise exception
                raise
            except xmlrpclib.Fault, e:
                if hasattr(self, 'close'):
                    self.close()
                if e.faultCode == ERROR_CODE:
                    raise LdtpExecutionError(e.faultString.encode('utf-8'))
                else:
                    raise e

    def __del__(self):
        self.kill_daemon()

    def kill_daemon(self):
        try:
            if _ldtp_windows_env and self._daemon:
                # If started by the current current, then terminate
                # else, silently quit
                subprocess.Popen('taskkill /F /IM WinLdtpdService.exe',
                                 shell = True, stdout = subprocess.PIPE,
                                 stderr = subprocess.PIPE).communicate()
            else:
                os.kill(self._daemon, signal.SIGKILL)
        except AttributeError:
            pass

class LdtpClient(xmlrpclib.ServerProxy):
    def __init__(self, uri, encoding=None, verbose=0, use_datetime=0):
        xmlrpclib.ServerProxy.__init__(
            self, uri, Transport(), encoding, verbose, 1, use_datetime)

    def __getattr__(self, name):
        # magic method dispatcher
        return _Method(self._ServerProxy__request, name)

    def kill_daemon(self):
        self._ServerProxy__transport.kill_daemon()

    def setHost(self, host):
        setattr(self, '_ServerProxy__host', host)

_client = LdtpClient('http://%s:%s' % (_ldtp_server_addr, _ldtp_server_port),
                     verbose = verbose)