#!/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__ = "0.2"

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

    status = None

    tid = -1

    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 True

    # stop()

    def __str__(self):

        return '%s( params=%s )' % \

               (self.__class__.__name__,

                self.params)

    # __str__()

# Transcoder

class RequestHandler(BaseHTTPServer.BaseHTTPRequestHandler):

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

    def_transcoder = None

    transcoders = utils.PluginSet(Transcoder)

    menu = {

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

        "Status": "/status.do",

        "Version": "/version.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 == "/version.do":

            self.serve_version(body)

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

            self.serve_stream(body)

        else:

            action = self.query.get("action", None)

            if "stream.do" in action:

                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 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_version(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("Version: %s" %  __version__)

    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()

        stopone = ""

        if body:

            tl = self.server.get_transcoders()

            if not tl:

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

                stopall = ""

            elif self.query.get("ip") and self.query.get("file"):

                for transcoder, request in tl:

                    filename = "%s" % self.query.get("file")[0]

                    tfilename = "%s" % transcoder.params_first("uri")

                    if tfilename.find(filename) >= 0 and \

                           request.client_address[0] == self.query.get("ip")[0]:

                        self.wfile.write("Status: %s %%" % transcoder.status)

                        return True

                return False

            else:

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

                stopall = utils._create_html_item("<a href='%s?request=all'>"

                                                 "[STOP ALL]</a>" %

                                                 self.menu["Stop"])

                for transcoder, request in tl:

                    stopone += utils._create_html_item("%s: %s:%s<a href='%s?"

                                                       "request=%s:%s'>"

                                                       "[STOP]</a> - "

                                                       "Status: %s%%"\

                                                     % (

                        transcoder, request.client_address[0],

                        request.client_address[1],

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

                        request.client_address[1],

                        transcoder.status) )

                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()