#!/usr/bin/env python

 __author__ = "Gustavo Sverzut Barbieri / Artur Duque de Souza"

 __author_email__ = "barbieri@gmail.com / artur.souza@indt.org.br"

 __license__ = "GPL"

 __version__ = "0.3"

 import os

 import threading

 import SocketServer

 import BaseHTTPServer

 import socket

 import urlparse

 import cgi

 import lib.utils as utils

 import logging as log

 __all__ = ("Transcoder", "RequestHandler", "Server", "serve_forever",

            "load_plugins_transcoders")

 class Transcoder(object):

     log = log.getLogger("gms.transcoder")

     priority = 0   # negative values have higher priorities

     name = None # to be used in requests

     def __init__(self, params):

         self.params = params

     # __init__()

     def params_first(self, key, default=None):

         if default is None:

             return self.params[key][0]

         else:

             try:

                 return self.params[key][0]

             except:

                 return default

     # params_first()

     def get_mimetype(self):

         mux = self.params_first("mux", "mpg")

         if mux == "mpeg":

             return "video/mpeg"

         elif mux == "avi":

             return "video/x-msvideo"

         else:

             return "application/octet-stream"

     # get_mimetype()

     def start(self, outfile):

         return True

     # start()

     def stop(self):

         return Tru

     # stop()

     def __str__(self):

         return '%s("%s", mux="%s", params=%s, addr=%s)' % \

                (self.__class__.__name__,

                 self.params_first("uri", "None"),

                 self.params_first("mux", "mpg"),

                 self.params,

                 repr(self))

     # __str__()

 # Transcoder

 class RequestHandler(BaseHTTPServer.BaseHTTPRequestHandler):

     log = log.getLogger("gms.request")

     def_transcoder = None

     transcoders = utils.PluginSet(Transcoder)

     menu = {

         "Status": "/status.do",

         "Stop": "/stop-transcoder.do",

         "Shutdown": "/shutdown.do"

         }

     @classmethod

     def load_plugins_transcoders(cls, directory):

         cls.transcoders.load_from_directory(directory)

         if cls.def_transcoder is None and cls.transcoders:

             cls.def_transcoder = cls.transcoders[0].name

     # load_plugins_transcoders()

     def do_dispatch(self, body):

         self.url = self.path

         pieces = urlparse.urlparse(self.path)

         self.path = pieces[2]

         self.query = cgi.parse_qs(pieces[4])

         if self.path == "/":

             self.serve_main(body)

         elif self.path == "/shutdown.do":

             self.serve_shutdown(body)

         elif self.path == "/stop-transcoder.do":

             self.serve_stop_transcoder(body)

         elif self.path == "/status.do":

             self.serve_status(body)

         elif self.path == "/play.do":

             self.serve_play(body)

         elif self.path == "/stream.do":

             self.serve_stream(body)

         else:

             self.send_error(404, "File not found")

     # do_dispatch()

     def do_GET(self):

         self.do_dispatch(True)

     # do_GET()

     def do_HEAD(self):

         self.do_dispatch(False)

     # do_HEAD()

     def _nav_items(self):

         ret = ""

         for name, url in self.menu.items():

             ret += utils.getHTML("menu", {"name": name, "url": url})

         return ret

     # _nav_items()

     def _create_html_item(self, opt):

         return "<li>%s</li>\n" % opt

     # _create_html_item

     def serve_main(self, body):

         self.send_response(200)

         self.send_header("Content-Type", "text/html")

         self.send_header('Connection', 'close')

         self.end_headers()

         if body:

             self.wfile.write(utils.getHTML("index", {"menu": self._nav_items()}))

     # serve_main()

     def serve_shutdown(self, body):

         self.send_response(200)

         self.send_header("Content-Type", "text/html")

         self.send_header('Connection', 'close')

         self.end_headers()

         if body:

             self.wfile.write(utils.getHTML("shutdown"))

         self.server.server_close()

     # serve_shutdown()

     def serve_stop_all_transcoders(self, body):

         self.send_response(200)

         self.send_header("Content-Type", "text/html")

         self.send_header('Connection', 'close')

         self.end_headers()

         if body:

             self.server.stop_transcoders()

             self.wfile.write(utils.getHTML("stop_all", {"menu": self._nav_items()}))

     # serve_stop_all_transcoders()

     def serve_stop_selected_transcoders(self, body, requests):

         self.send_response(200)

         self.send_header("Content-Type", "text/html")

         self.send_header('Connection', 'close')

         self.end_headers()

         opts = ""

         if body:

             transcoders = self.server.get_transcoders()

             for req in requests:

                 try:

                     host, port = req.split(":")

                 except IndexError:

                     continue

                 port = int(port)

                 addr = (host, port)

                 for t, r in transcoders:

                     if r.client_address == addr:

                         try:

                             t.stop()

                         except Exception, e:

                             self.log.info("Plugin already stopped")

                         opts += self._create_html_item("%s: %s:%s" % (

                             t, addr[0], addr[1]))

                         break

                 self.wfile.write(utils.getHTML("stop_selected",

                                                {"menu": self._nav_items(),

                                                 "opts": opts}))

     # serve_stop_selected_transcoders()

     def serve_stop_transcoder(self, body):

         req = self.query.get("request", None)

         if req and "all" in req:

             self.serve_stop_all_transcoders(body)

         elif req:

             self.serve_stop_selected_transcoders(body, req)

         else:

             self.serve_status(body)

     # serve_stop_transcoder()

     def serve_status(self, body):

         self.send_response(200)

         self.send_header("Content-Type", "text/html")

         self.send_header('Connection', 'close')

         self.end_headers()

         if body:

             tl = self.server.get_transcoders()

             if not tl:

                 running = "<p>No running transcoder.</p>\n"

                 stopall = ""

                 stopone = ""

             else:

                 running = "<p>Running transcoders:</p>\n"

                 stopall = self._create_html_item("<a href='%s?request=all'>[STOP ALL]</a>" %

                                                  self.menu["Stop"])

                 for transcoder, request in tl:

                     stopone = self._create_html_item("%s: %s:%s<a href='%s?request=%s:%s'>"

                                                      "[STOP]</a>" % (

                         transcoder, request.client_address[0], request.client_address[1],

                         self.menu["Stop"], request.client_address[0], request.client_address[1]) )

             self.wfile.write(utils.getHTML("status",

                                            {"menu": self._nav_items(),

                                             "running": running,

                                             "stopall": stopall,

                                             "stopone": stopone}))

     # serve_status()

     def _get_transcoder(self):

         # get transcoder option: mencoder is the default

         request_transcoders = self.query.get("transcoder", ["mencoder"])

         for t in request_transcoders:

             transcoder = self.transcoders.get(t)

             if transcoder:

                 return transcoder

         if not transcoder:

             return self.transcoders[self.def_transcoder]

     # _get_transcoder()

     def serve_stream(self, body):

         transcoder = self._get_transcoder()

         try:

             obj = transcoder(self.query)

         except Exception, e:

             self.send_error(500, str(e))

             return

         self.send_response(200)

         self.send_header("Content-Type", obj.get_mimetype())

         self.send_header('Connection', 'close')

         self.end_headers()

         if body:

             self.server.add_transcoders(self, obj)

             obj.start(self.wfile)

             self.server.del_transcoders(self, obj)

     # serve_stream()

     def log_request(self, code='-', size='-'):

         self.log.info('"%s" %s %s', self.requestline, str(code), str(size))

     # log_request()

     def log_error(self, format, *args):

         self.log.error("%s: %s" % (self.address_string(), format % args))

     # log_error()

     def log_message(self, format, *args):

         self.log.info("%s: %s" % (self.address_string(), format % args))

     # log_message()

 # RequestHandler

 class Server(SocketServer.ThreadingMixIn, BaseHTTPServer.HTTPServer):

     log = log.getLogger("gms.server")

     run = True

     _transcoders = {}

     _lock = threading.RLock()

     def serve_forever(self):

         self.log.info("GMyth-Streamer serving HTTP on %s:%s" %

                       self.socket.getsockname())

         try:

             while self.run:

                 self.handle_request()

         except KeyboardInterrupt, e:

             pass

         self.log.debug("Stopping all remaining transcoders...")

         self.stop_transcoders()

         self.log.debug("Transcoders stopped!")

     # serve_forever()

     def get_request(self):

         skt = self.socket

         old = skt.gettimeout()

         skt.settimeout(0.5)

         while self.run:

             try:

                 r = skt.accept()

                 skt.settimeout(old)

                 return r

             except socket.timeout, e:

                 pass

         raise socket.error("Not running")

     # get_request()

     def server_close(self):

         self.run = False

         self.stop_transcoders()

         BaseHTTPServer.HTTPServer.server_close(self)

     # server_close()

     def stop_transcoders(self):

         self._lock.acquire()

         for transcoder, request in self._transcoders.iteritems():

             self.log.info("Stop transcoder: %s, client=%s" %

                           (transcoder, request.client_address))

             transcoder.stop()

         self._lock.release()

     # stop_transcoders()

     def get_transcoders(self):

         self._lock.acquire()

         try:

             return self._transcoders.items()

         finally:

             self._lock.release()

     # get_transcoders()

     def add_transcoders(self, request, transcoder):

         self._lock.acquire()

         try:

             self._transcoders[transcoder] = request

         finally:

             self._lock.release()

     # add_transcoders()

     def del_transcoders(self, request, transcoder):

         self._lock.acquire()

         try:

             del self._transcoders[transcoder]

         finally:

             self._lock.release()

     # del_transcoders()

 # Server

 def serve_forever(host="0.0.0.0", port=40000):

     addr = (host, port)

     RequestHandler.protocol_version = "HTTP/1.0"

     httpd = Server(addr, RequestHandler)

     httpd.serve_forever()

 # serve_forever()

 def load_plugins_transcoders(directory):

     RequestHandler.load_plugins_transcoders(directory)

 # load_plugins_transcoders()