#!/usr/bin/python
'''
The MIT License (MIT)

Copyright (c) 2013-2014 winlin

Permission is hereby granted, free of charge, to any person obtaining a copy of
this software and associated documentation files (the "Software"), to deal in
the Software without restriction, including without limitation the rights to
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
the Software, and to permit persons to whom the Software is furnished to do so,
subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
'''

"""
the api-server is a default demo server for srs to call
when srs get some event, for example, when client connect
to srs, srs can invoke the http api of the api-server
"""

import sys
# reload sys model to enable the getdefaultencoding method.
reload(sys)
# set the default encoding to utf-8
# using exec to set the encoding, to avoid error in IDE.
exec("sys.setdefaultencoding('utf-8')")
assert sys.getdefaultencoding().lower() == "utf-8"

import os, json, time, datetime, cherrypy, threading

# simple log functions.
def trace(msg):
    date = datetime.datetime.now().strftime("%Y-%m-%d %H:%M:%S")
    print "[%s][trace] %s"%(date, msg)

# enable crossdomain access for js-client
def enable_crossdomain():
    cherrypy.response.headers["Access-Control-Allow-Origin"] = "*"
    cherrypy.response.headers["Access-Control-Allow-Methods"] = "GET, POST, HEAD, PUT, DELETE"
    # generate allow headers for crossdomain.
    allow_headers = ["Cache-Control", "X-Proxy-Authorization", "X-Requested-With", "Content-Type"]
    cherrypy.response.headers["Access-Control-Allow-Headers"] = ",".join(allow_headers)

# error codes definition
class Error:
    # ok, success, completed.
    success = 0
    # error when parse json
    system_parse_json = 100
    # request action invalid
    request_invalid_action = 200

'''
handle the clients requests: connect/disconnect vhost/app.
'''
class RESTClients(object):
    exposed = True

    def GET(self):
        enable_crossdomain()

        clients = {}
        return json.dumps(clients)

    '''
    for SRS hook: on_connect/on_close
    on_connect:
        when client connect to vhost/app, call the hook,
        the request in the POST data string is a object encode by json:
              {
                  "action": "on_connect",
                  "client_id": 1985,
                  "ip": "192.168.1.10", "vhost": "video.test.com", "app": "live",
                  "pageUrl": "http://www.test.com/live.html"
              }
    on_close:
        when client close/disconnect to vhost/app/stream, call the hook,
        the request in the POST data string is a object encode by json:
              {
                  "action": "on_close",
                  "client_id": 1985,
                  "ip": "192.168.1.10", "vhost": "video.test.com", "app": "live"
              }
    if valid, the hook must return HTTP code 200(Stauts OK) and response
    an int value specifies the error code(0 corresponding to success):
          0
    '''
    def POST(self):
        enable_crossdomain()

        # return the error code in str
        code = Error.success

        req = cherrypy.request.body.read()
        trace("post to clients, req=%s"%(req))
        try:
            json_req = json.loads(req)
        except Exception, ex:
            code = Error.system_parse_json
            trace("parse the request to json failed, req=%s, ex=%s, code=%s"%(req, ex, code))
            return str(code)

        action = json_req["action"]
        if action == "on_connect":
            code = self.__on_connect(json_req)
        elif action == "on_close":
            code = self.__on_close(json_req)
        else:
            trace("invalid request action: %s"%(json_req["action"]))
            code = Error.request_invalid_action

        return str(code)

    def OPTIONS(self):
        enable_crossdomain()

    def __on_connect(self, req):
        code = Error.success

        trace("srs %s: client id=%s, ip=%s, vhost=%s, app=%s, pageUrl=%s"%(
            req["action"], req["client_id"], req["ip"], req["vhost"], req["app"], req["pageUrl"]
        ))

        # TODO: process the on_connect event

        return code

    def __on_close(self, req):
        code = Error.success

        trace("srs %s: client id=%s, ip=%s, vhost=%s, app=%s"%(
            req["action"], req["client_id"], req["ip"], req["vhost"], req["app"]
        ))

        # TODO: process the on_close event

        return code

'''
handle the streams requests: publish/unpublish stream.
'''
class RESTStreams(object):
    exposed = True

    def GET(self):
        enable_crossdomain()

        streams = {}
        return json.dumps(streams)

    '''
    for SRS hook: on_publish/on_unpublish
    on_publish:
        when client(encoder) publish to vhost/app/stream, call the hook,
        the request in the POST data string is a object encode by json:
              {
                  "action": "on_publish",
                  "client_id": 1985,
                  "ip": "192.168.1.10", "vhost": "video.test.com", "app": "live",
                  "stream": "livestream"
              }
    on_unpublish:
        when client(encoder) stop publish to vhost/app/stream, call the hook,
        the request in the POST data string is a object encode by json:
              {
                  "action": "on_unpublish",
                  "client_id": 1985,
                  "ip": "192.168.1.10", "vhost": "video.test.com", "app": "live",
                  "stream": "livestream"
              }
    if valid, the hook must return HTTP code 200(Stauts OK) and response
    an int value specifies the error code(0 corresponding to success):
          0
    '''
    def POST(self):
        enable_crossdomain()

        # return the error code in str
        code = Error.success

        req = cherrypy.request.body.read()
        trace("post to streams, req=%s"%(req))
        try:
            json_req = json.loads(req)
        except Exception, ex:
            code = Error.system_parse_json
            trace("parse the request to json failed, req=%s, ex=%s, code=%s"%(req, ex, code))
            return str(code)

        action = json_req["action"]
        if action == "on_publish":
            code = self.__on_publish(json_req)
        elif action == "on_unpublish":
            code = self.__on_unpublish(json_req)
        else:
            trace("invalid request action: %s"%(json_req["action"]))
            code = Error.request_invalid_action

        return str(code)

    def OPTIONS(self):
        enable_crossdomain()

    def __on_publish(self, req):
        code = Error.success

        trace("srs %s: client id=%s, ip=%s, vhost=%s, app=%s, stream=%s"%(
            req["action"], req["client_id"], req["ip"], req["vhost"], req["app"], req["stream"]
        ))

        # TODO: process the on_publish event

        return code

    def __on_unpublish(self, req):
        code = Error.success

        trace("srs %s: client id=%s, ip=%s, vhost=%s, app=%s, stream=%s"%(
            req["action"], req["client_id"], req["ip"], req["vhost"], req["app"], req["stream"]
        ))

        # TODO: process the on_unpublish event

        return code

'''
handle the sessions requests: client play/stop stream
'''
class RESTSessions(object):
    exposed = True

    def GET(self):
        enable_crossdomain()

        sessions = {}
        return json.dumps(sessions)

    '''
    for SRS hook: on_play/on_stop
    on_play:
        when client(encoder) publish to vhost/app/stream, call the hook,
        the request in the POST data string is a object encode by json:
              {
                  "action": "on_play",
                  "client_id": 1985,
                  "ip": "192.168.1.10", "vhost": "video.test.com", "app": "live",
                  "stream": "livestream"
              }
    on_stop:
        when client(encoder) stop publish to vhost/app/stream, call the hook,
        the request in the POST data string is a object encode by json:
              {
                  "action": "on_stop",
                  "client_id": 1985,
                  "ip": "192.168.1.10", "vhost": "video.test.com", "app": "live",
                  "stream": "livestream"
              }
    if valid, the hook must return HTTP code 200(Stauts OK) and response
    an int value specifies the error code(0 corresponding to success):
          0
    '''
    def POST(self):
        enable_crossdomain()

        # return the error code in str
        code = Error.success

        req = cherrypy.request.body.read()
        trace("post to sessions, req=%s"%(req))
        try:
            json_req = json.loads(req)
        except Exception, ex:
            code = Error.system_parse_json
            trace("parse the request to json failed, req=%s, ex=%s, code=%s"%(req, ex, code))
            return str(code)

        action = json_req["action"]
        if action == "on_play":
            code = self.__on_play(json_req)
        elif action == "on_stop":
            code = self.__on_stop(json_req)
        else:
            trace("invalid request action: %s"%(json_req["action"]))
            code = Error.request_invalid_action

        return str(code)

    def OPTIONS(self):
        enable_crossdomain()

    def __on_play(self, req):
        code = Error.success

        trace("srs %s: client id=%s, ip=%s, vhost=%s, app=%s, stream=%s"%(
            req["action"], req["client_id"], req["ip"], req["vhost"], req["app"], req["stream"]
        ))

        # TODO: process the on_play event

        return code

    def __on_stop(self, req):
        code = Error.success

        trace("srs %s: client id=%s, ip=%s, vhost=%s, app=%s, stream=%s"%(
            req["action"], req["client_id"], req["ip"], req["vhost"], req["app"], req["stream"]
        ))

        # TODO: process the on_stop event

        return code

'''
the server list
'''
class RESTServers(object):
    exposed = True
    
    def __init__(self):
        self.__server_ip = "192.168.1.142";

    '''
    id canbe:
        ingest: the ingest demo.
            action: canbe play or mgmt, play to play the inest stream, mgmt to get api/v1/versions.
            stream: the stream to play, for example, live/livestream for http://server:8080/live/livestream.html
        meeting: the meeting demo. jump to web meeting if index is None.
            local: whether view the local raspberry-pi stream. if "true", redirect to the local(internal) api server.
            index: the meeting stream index, dynamic get the streams from root.api.v1.chats.get_url_by_index(index)
    '''
    def GET(self, id=None, action="play", stream="live/livestream", index=None, local="false"):
        enable_crossdomain()
        if id == "meeting":
            if index is None:
                url = "http://%s:8085"%(self.__server_ip)
            elif local == "true":
                url = "http://%s:8085/api/v1/servers?id=%s&index=%s&local=false"%(self.__server_ip, id, index)
            else:
                rtmp_url = root.api.v1.chats.get_url_by_index(index)
                if rtmp_url is None:
                    return "meeting stream not found"
                urls = rtmp_url.replace("...vhost...", "?vhost=").replace("rtmp://", "").split("/")
                hls_url = "http://%s:8080/%s/%s.m3u8"%(urls[0].replace(":1935",""), urls[1].split("?")[0], urls[2])
                return """
<video width="640" height="360"
        autoplay controls autobuffer 
        src="%s"
        type="application/vnd.apple.mpegurl">
</video>"""%(hls_url);
        else:
            if action == "play":
                url = "http://%s:8080/%s.html"%(self.__server_ip, stream)
            else:
                url = "http://%s:8080/api/v1/versions"%(self.__server_ip)
        #return "id=%s, action=%s, stream=%s, url=%s, index=%s, local=%s"%(id, action, stream, url, index, local)
        raise cherrypy.HTTPRedirect(url)
        
    def POST(self):
        enable_crossdomain()
        raise cherrypy.HTTPError(405, "Not allowed.")

    def DELETE(self, id):
        enable_crossdomain()
        raise cherrypy.HTTPError(405, "Not allowed.")

    def PUT(self, id):
        enable_crossdomain()
        raise cherrypy.HTTPError(405, "Not allowed.")

    def OPTIONS(self, id=None):
        enable_crossdomain()

global_chat_id = os.getpid();
'''
the chat streams, public chat room.
'''
class RESTChats(object):
    exposed = True
    global_id = 100
    
    def __init__(self):
        # object fields:
        # id: an int value indicates the id of user.
        # username: a str indicates the user name.
        # url: a str indicates the url of user stream.
        # agent: a str indicates the agent of user.
        # join_date: a number indicates the join timestamp in seconds.
        # join_date_str: a str specifies the formated friendly time.
        # heatbeat: a number indicates the heartbeat timestamp in seconds.
        # vcodec: a dict indicates the video codec info.
        # acodec: a dict indicates the audio codec info.
        self.__chats = [];
        self.__chat_lock = threading.Lock();

        # dead time in seconds, if exceed, remove the chat.
        self.__dead_time = 15;
    
    '''
    get the rtmp url of chat object. None if overflow.
    '''
    def get_url_by_index(self, index):
        index = int(index)
        if index is None or index >= len(self.__chats):
            return None;
        return self.__chats[index]["url"];

    def GET(self):
        enable_crossdomain()

        try:
            self.__chat_lock.acquire();

            chats = [];
            copy = self.__chats[:];
            for chat in copy:
                if time.time() - chat["heartbeat"] > self.__dead_time:
                    self.__chats.remove(chat);
                    continue;

                chats.append({
                    "id": chat["id"],
                    "username": chat["username"],
                    "url": chat["url"],
                    "join_date_str": chat["join_date_str"],
                    "heartbeat": chat["heartbeat"],
                });
        finally:
            self.__chat_lock.release();
            
        return json.dumps({"code":0, "data": {"now": time.time(), "chats": chats}})
        
    def POST(self):
        enable_crossdomain()
        
        req = cherrypy.request.body.read()
        chat = json.loads(req)

        global global_chat_id;
        chat["id"] = global_chat_id
        global_chat_id += 1

        chat["join_date"] = time.time();
        chat["heartbeat"] = time.time();
        chat["join_date_str"] = time.strftime("%Y-%m-%d %H:%M:%S");

        try:
            self.__chat_lock.acquire();

            self.__chats.append(chat)
        finally:
            self.__chat_lock.release();

        trace("create chat success, id=%s"%(chat["id"]))
        
        return json.dumps({"code":0, "data": chat["id"]})

    def DELETE(self, id):
        enable_crossdomain()

        try:
            self.__chat_lock.acquire();

            for chat in self.__chats:
                if str(id) != str(chat["id"]):
                    continue

                self.__chats.remove(chat)
                trace("delete chat success, id=%s"%(id))

                return json.dumps({"code":0, "data": None})
        finally:
            self.__chat_lock.release();

        raise cherrypy.HTTPError(405, "Not allowed.")

    def PUT(self, id):
        enable_crossdomain()

        try:
            self.__chat_lock.acquire();

            for chat in self.__chats:
                if str(id) != str(chat["id"]):
                    continue

                chat["heartbeat"] = time.time();
                trace("heartbeat chat success, id=%s"%(id))

                return json.dumps({"code":0, "data": None})
        finally:
            self.__chat_lock.release();

        raise cherrypy.HTTPError(405, "Not allowed.")


    def OPTIONS(self, id=None):
        enable_crossdomain()

# HTTP RESTful path.
class Root(object):
    def __init__(self):
        self.api = Api()
# HTTP RESTful path.
class Api(object):
    def __init__(self):
        self.v1 = V1()
# HTTP RESTful path. to access as:
#   http://127.0.0.1:8085/api/v1/clients
class V1(object):
    def __init__(self):
        self.clients = RESTClients()
        self.streams = RESTStreams()
        self.sessions = RESTSessions()
        self.chats = RESTChats()
        self.servers = RESTServers()

'''
main code start.
'''
# donot support use this module as library.
if __name__ != "__main__":
    raise Exception("embed not support")

# check the user options
if len(sys.argv) <= 1:
    print "SRS api callback server, Copyright (c) 2013-2014 winlin"
    print "Usage: python %s <port>"%(sys.argv[0])
    print "    port: the port to listen at."
    print "For example:"
    print "    python %s 8085"%(sys.argv[0])
    print ""
    print "See also: https://github.com/winlinvip/simple-rtmp-server"
    sys.exit(1)

# parse port from user options.
port = int(sys.argv[1])
static_dir = os.path.abspath(os.path.join(os.path.dirname(sys.argv[0]), "static-dir"))
trace("api server listen at port: %s, static_dir: %s"%(port, static_dir))

# cherrypy config.
conf = {
    'global': {
        'server.shutdown_timeout': 1,
        'server.socket_host': '0.0.0.0',
        'server.socket_port': port,
        'tools.encode.on': True,
        'tools.staticdir.on': True,
        'tools.encode.encoding': "utf-8"
    },
    '/': {
        'tools.staticdir.dir': static_dir,
        'tools.staticdir.index': "index.html",
        # for cherrypy RESTful api support
        'request.dispatch': cherrypy.dispatch.MethodDispatcher()
    }
}

# start cherrypy web engine
trace("start cherrypy server")
root = Root()
cherrypy.quickstart(root, '/', conf)