""" the core of the builtin bcfg2 server """

import os
import sys
import time
import socket
import daemon
import Bcfg2.Statistics
from Bcfg2.Server.Core import BaseCore, NoExposedMethod
from Bcfg2.Compat import xmlrpclib, urlparse
from Bcfg2.SSLServer import XMLRPCServer


class PidFile(object):
    """ context handler to write the pid file """
    def __init__(self, pidfile):
        self.pidfile = pidfile

    def __enter__(self):
        open(self.pidfile, "w").write("%s\n" % os.getpid())

    def __exit__(self, exc_type, exc_value, exc_traceback):
        os.unlink(self.pidfile)


class Core(BaseCore):
    """ The built-in server core """
    name = 'bcfg2-server'

    def __init__(self, setup):
        BaseCore.__init__(self, setup)
        self.server = None
        self.context = \
            daemon.DaemonContext(uid=self.setup['daemon_uid'],
                                 gid=self.setup['daemon_gid'],
                                 pidfile=PidFile(self.setup['daemon']))

    def _dispatch(self, method, args, dispatch_dict):
        """Custom XML-RPC dispatcher for components.

        method -- XML-RPC method name
        args -- tuple of paramaters to method

        """
        if method in dispatch_dict:
            method_func = dispatch_dict[method]
        else:
            try:
                method_func = self._resolve_exposed_method(method)
            except NoExposedMethod:
                self.logger.error("Unknown method %s" % (method))
                raise xmlrpclib.Fault(xmlrpclib.METHOD_NOT_FOUND,
                                      "Unknown method %s" % method)

        try:
            method_start = time.time()
            try:
                result = method_func(*args)
            finally:
                Bcfg2.Statistics.stats.add_value(method,
                                                 time.time() - method_start)
        except xmlrpclib.Fault:
            raise
        except Exception:
            err = sys.exc_info()[1]
            if getattr(err, "log", True):
                self.logger.error(err, exc_info=True)
            raise xmlrpclib.Fault(getattr(err, "fault_code", 1), str(err))
        return result

    def _daemonize(self):
        self.context.open()
        self.logger.info("%s daemonized" % self.name)

    def _run(self):
        hostname, port = urlparse(self.setup['location'])[1].split(':')
        server_address = socket.getaddrinfo(hostname,
                                            port,
                                            socket.AF_UNSPEC,
                                            socket.SOCK_STREAM)[0][4]
        try:
            self.server = XMLRPCServer(self.setup['listen_all'],
                                       server_address,
                                       keyfile=self.setup['key'],
                                       certfile=self.setup['cert'],
                                       register=False,
                                       timeout=1,
                                       ca=self.setup['ca'],
                                       protocol=self.setup['protocol'])
        except:  # pylint: disable=W0702
            err = sys.exc_info()[1]
            self.logger.error("Server startup failed: %s" % err)
            self.context.close()
            return False
        self.server.register_instance(self)
        return True

    def _block(self):
        try:
            self.server.serve_forever()
        finally:
            self.server.server_close()
            self.context.close()
        self.shutdown()