def __init__(self, repo_path):
self.open_portforward(True)
self.s = None;
self.is_connected=False
self.send_socket = None;
self.repo_path = repo_path
self.username = None;
self.app_start_time = time.time()
self.logical_clk_time = 0;
self.music_counter = [0, ];
self.music_table = {}
self.session_table = {}
self.file_table = {}
self.music_info_object = Music_Info()
self.music_info, self.file_table = self.music_info_object.read_repo(self.music_counter, self.repo_path)
self.music_table_lock = threading.Lock()
self.session_table_lock = threading.Lock()
self.logical_clk_lock = threading.Lock()
self.music_info_lock = threading.Lock()
self.detectlost_lock = threading.Lock()
self.connection_server=''
self.connection_state=False
self.normal_shutdown=False
self.logical_time=0
self.poll_event=threading.Event()
self.hb_event=threading.Event()
self.received_hb={}
self.connect_server()
self.thread_client_receive = threading.Thread(target=self.receive_client)
self.thread_client_receive.start()
self.thread_client_HB = threading.Thread(target=self.period_CCHB)
self.thread_client_HB.start()
self.thread_server_HB = threading.Thread(target=self.send_hb)
self.thread_server_HB.start()
self.thread_client_DL = threading.Thread(target=self.detectLost)
self.thread_client_DL.start()
self.thread_poll_server= threading.Thread(target=self.poll_server)
self.thread_poll_server.start()
self.thread_client_liveness = threading.Thread(target=self.client_liveness_check)
self.thread_client_liveness.start()
self.player=Player(self,)
class client(object):
def __init__(self, repo_path):
self.open_portforward(True)
self.s = None;
self.is_connected=False
self.send_socket = None;
self.repo_path = repo_path
self.username = None;
self.app_start_time = time.time()
self.logical_clk_time = 0;
self.music_counter = [0, ];
self.music_table = {}
self.session_table = {}
self.file_table = {}
self.music_info_object = Music_Info()
self.music_info, self.file_table = self.music_info_object.read_repo(self.music_counter, self.repo_path)
self.music_table_lock = threading.Lock()
self.session_table_lock = threading.Lock()
self.logical_clk_lock = threading.Lock()
self.music_info_lock = threading.Lock()
self.detectlost_lock = threading.Lock()
self.connection_server=''
self.connection_state=False
self.normal_shutdown=False
self.logical_time=0
self.poll_event=threading.Event()
self.hb_event=threading.Event()
self.received_hb={}
self.connect_server()
self.thread_client_receive = threading.Thread(target=self.receive_client)
self.thread_client_receive.start()
self.thread_client_HB = threading.Thread(target=self.period_CCHB)
self.thread_client_HB.start()
self.thread_server_HB = threading.Thread(target=self.send_hb)
self.thread_server_HB.start()
self.thread_client_DL = threading.Thread(target=self.detectLost)
self.thread_client_DL.start()
self.thread_poll_server= threading.Thread(target=self.poll_server)
self.thread_poll_server.start()
self.thread_client_liveness = threading.Thread(target=self.client_liveness_check)
self.thread_client_liveness.start()
self.player=Player(self,)
def open_portforward(self,value):
if value:
self.unified_port=False
#................For telling bootstrap server...................
self.public_ip=str(self.get_real_ip())
self.public_map_port=40001 #remote map listen port
self.real_ip_address=(self.public_ip,self.public_map_port)
#................For local listening...................
self.ip=str(self.getNetworkIp())
self.port=self.public_map_port #local listen port
self.listening_addr=(self.ip,self.port)
#................For test in local Lan, if self.unified_port=True,it can be tested in Lan,otherwise it must be tested in WAN
if self.unified_port:
self.public_ip=self.ip
self.public_map_port=self.port
self.real_ip_address=self.listening_addr
self.open_listener()
else:
self.open_local_listener()
self.ip=self.listening_addr[0]
self.port=self.listening_addr[1] #local listen port
self.public_ip=self.ip
self.public_map_port=self.port
self.real_ip_address=self.listening_addr
def getNetworkIp(self):
s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
s.connect(('google.com', 0))
return s.getsockname()[0]
def get_real_ip(self):
# group = re.compile(u'(?P<ip>\d+\.\d+\.\d+\.\d+)').search(urllib.URLopener().open('http://jsonip.com/').read()).groupdict()
# return group['ip']
ip = urllib.urlopen('http://ip.42.pl/raw').read()
print ip
return ip
def connect_server(self):
# Try Primary Server
if self.connection_server=='':
print "Request Primary Server in next 5s, please wait"
past=time.time();
self.t=0
while self.t<5:
try:
self.s = socket.create_connection((CS_Primary_Request_IP, CS_Primary_Request_Port),10)
self.connection_state=True
self.connection_server='Primary'
print "Connected to Primary Server!!!"
break
except:
self.connection_state=False
self.t=time.time()-past
# Try Secondary server
if self.connection_state==False:
print "Primary Server fails,.............."
print "Request Secondary Server in next 10s,please wait"
past=time.time();
self.t=0
while self.t<10:
try:
self.s = socket.create_connection((CS_Backup_Request_IP, CS_Backup_Request_Port),10)
print "Connected to Secondary Server!!!"
self.connection_state=True
self.connection_server='Secondary'
break
except:
self.connection_state=False
self.t=time.time()-past
if self.connection_server=='Secondary' and self.username:
self.hb_event.set()
self.poll_event.set()
self.s.shutdown(socket.SHUT_RDWR)
self.s.close()
# Give user feedback and close the program
if self.connection_state==False:
print "Secondary Server fails,,.............."
time.sleep(1)
print "We are sorry for that, you cannot update your userlist currently"
past=time.time()
self.t=0
while self.t<10:
self.t=time.time()-past
sys.exit()
def send_hb(self):
flag=True
while True:
self.hb_event.wait()
if self.connection_state and self.connection_server=='Primary':
try:
self.hb = socket.create_connection((CS_Primary_Request_IP, CS_Primary_Request_Port))
self.hb_enable=True
except:
if flag:
print "\n................Primary Server May be down........................"
flag=False
self.hb_enable=False
elif self.connection_state and self.connection_server=='Secondary':
try:
self.hb = socket.create_connection((CS_Backup_Request_IP, CS_Backup_Request_Port))
self.hb_enable=True
except:
print "\n................Secondary Server May be down........................"
self.hb_enable=False
if self.hb_enable:
try:
message=('PyHB',self.username,self.logical_time)
self.hb.send(str(message))
self.logical_time=self.logical_time+1
except:
print "HB cannot send to server"
print "\nHeartbeat Message is sent to '%s' %s" % (str(self.connection_server), str(time.ctime()) )
self.received_hb[self.connection_server]=time.time()
self.hb_enable=False
# self.hb.shutdown(socket.SHUT_RDWR)
self.hb.close()
time.sleep(BEAT_PERIOD)
def detectLost(self):
while True:
limit = time.time() - CHECK_TIMEOUT
self.detectlost_lock.acquire()
servername=''
for servername in self.received_hb.keys():
if self.received_hb[servername]<= limit:
del self.received_hb[servername]
if self.normal_shutdown:
print "------------------I gracefully leave the %s Server --------------------" %servername
self.normal_shutdown=False
else:
print "------------------%s Server get lost--------------------" %servername
self.connection_state=False
self.hb_event.clear()
self.connect_server()
self.detectlost_lock.release()
time.sleep(1)
def poll_server(self):
t=15
while True:
self.poll_event.wait()
print "Primary is being polled"
if self.connection_state and self.connection_server=='Secondary' :
try:
self.poll = socket.create_connection((CS_Primary_Request_IP, CS_Primary_Request_Port))
pconn=True
except:
pconn=False
if pconn:
print "...................Server state exchange is processing...................."
self.poll.shutdown(socket.SHUT_RDWR)
self.poll.close()
self.normal_shutdown=True
self.connection_state=True;self.connection_server='Primary'
self.poll_event.clear()
time.sleep(t)
# if t<3600:
# t=t+60
# else:
# t=3600
def print_list(self,data):
print ".......................User Table is.....................\n"
num=1;
userlist=ast.literal_eval(data)
for i in userlist[1]:
print num,':',i[0],':',i[1],':',i[2],'\n'
num=num+1
def init_username(self):
addr=self.listening_addr;
message=('CHB', self.public_ip, self.public_map_port, self.username)
try :
self.s.sendall(str(message))
except Exception as inst :
print type(inst)
print inst
# print "send to server error"
self.init_username_error()
infds_c,outfds_c,errfds_c = select.select([self.s,],[],[])
data=''
if len(infds_c)!= 0:
print '4'
try:
data=self.s.recv(8192)
except Exception as inst :
print "receive from server error"
print type(inst)
print inst
self.init_username_error()
self.print_list(data)
if len(data) != 0:
print '2'
# self.s.shutdown(socket.SHUT_RDWR)
self.s.close()
self.hb_event.set()
if self.connection_server=="Secondary":
self.poll_event.set()
xyz=ast.literal_eval(data)# change it to tuple
if xyz[0] == 'UT':
print '1'
self.session_table_lock.acquire()
self.music_table_lock.acquire()
# contact other clients except myself
for ut_item in xyz[1] :
key = (ut_item[0], int(ut_item[1]))
self.session_table[key] = {'username' : ut_item[2], 'app_start_time' : None, 'logical_clk_time' : None, 'last_recv_time' : time.time()}
if key == self.real_ip_address :
self.music_table[key] = self.music_info
self.session_table[key]['app_start_time'] = self.app_start_time
self.music_table_lock.release()
self.session_table_lock.release()
print "first time multicasting discovery message to clients - this line shouldn't be seen twice"
self.multicast_CCD()
else :
print 'something is wrong 1'
else :
print 'something is wrong 3'
def init_username_error(self) :
print "server is down in sending first server discovery"
try :
self.s.shutdown(socket.SHUT_RDWR)
self.s.close()
except :
print 'shut down connection to server error'
self.connect_server()
self.init_username()
def receive_client(self):
while True :
peer_socket, peer_address = self.listening_sock.accept()
peer_socket.settimeout(10)
data = peer_socket.recv(8192 * 16)
# print data;
#message=Client_Message(None,None,None,None,None)
peer_socket.close()
try:
# with open('pfile', 'wb') as f :
# f.write(data)
# with open('pfile', 'rb') as f :
# message = pickle.load(f)
message = pickle.loads(data);
print message
# print message
print 'receive new message of type %s, from client %s' % (message.m_type, message.sender_listening_addr)
except Exception as inst:
print 'in receive_client',
print type(inst)
print inst
# message.m_type=None
# message.sender_listening_addr=None
continue
self.session_table_lock.acquire()
session_table_entry = {};
# check logical_clk_time
if message.sender_listening_addr in self.session_table.keys() and message.logical_clk_time <= self.session_table[message.sender_listening_addr]['logical_clk_time'] :
self.session_table_lock.release()
continue
session_table_entry['logical_clk_time'] = message.logical_clk_time
# record last_recv_time
session_table_entry['last_recv_time'] = time.time()
session_table_entry['username'] = message.username
session_table_entry['app_start_time'] = message.app_start_time
self.session_table[message.sender_listening_addr] = session_table_entry
self.session_table_lock.release()
if message.m_type == 'CCHB' or message.m_type == 'CCD' :
self.music_table_lock.acquire()
self.music_table[message.sender_listening_addr] = message.music_info
self.music_table_lock.release()
print "client discovery | heartbeat message received"
print message.m_type, message.sender_listening_addr
if message.m_type == 'CCD' :
# send hb message back right asway
print 'message received is discovery; sending back a client heartbeat message as reply'
self.send_C_Music(message.sender_listening_addr, 'CCHB')
elif message.m_type == 'LIKE' or message.m_type == 'STREAM' or message.m_type == 'REP' :
if message.receiver_app_start_time == self.app_start_time :
print 'app_start_times match'
if message.m_type == 'LIKE' and message.song_seq_no in self.music_info.keys() :
self.music_info_lock.acquire()
self.music_info[message.song_seq_no].like = self.music_info[message.song_seq_no].like+1
self.music_info_lock.release()
elif message.m_type == 'STREAM' :
# print 'stream'
self.thread_stream = threading.Thread(target=self.stream_music, args=(message,))
self.thread_stream.start()
elif message.m_type == 'REP' :
# self.patch_music_table_rep(self.listening_addr, message.song_seq_no, message.sender_listening_addr, message.cache_seq)
self.patch_music_table_rep(self.read_ip__address, message.song_seq_no, message.sender_listening_addr, message.cache_seq)
self.multicast_C_Music('CCHB')
else :
print 'app_start_times don\'t match'
# print message.receiver_app_start_time, self.app_start_time
self.send_C_Music(message.sender_listening_addr, 'CCHB')
def stream_music(self, message) :
''' This function handles the streaming request message '''
song_local_seq = message.song_seq_no
if song_local_seq in self.file_table.keys() :
song_local_path = self.file_table[song_local_seq]
print "-----------------------------Stream Info-------------------------------"
print "request song_num :",song_local_seq
print "request song path :",song_local_path
print "send stream to ip :",message.sender_listening_addr[0]
print "send stream to port :", message.sender_listening_addr[1]
self.player.sender_init(message.sender_listening_addr[0],message.sender_listening_addr[1],song_local_path)
else :
# FIXME: requested song is not there; should reply with rejection
print "Song is not in current peer now"
pass
pass
def dump_table(self):
print 'dump tables: '
print '..............................Music Table...........................'
for key in self.music_table.keys():
print "..............." ,key
for i in self.music_table[key].keys():
print i,":",self.music_table[key][i],'\n'
# print self.session_table
print '..............................File Table...........................'
for key in self.file_table:
print key,":",self.file_table[key],'\n'
print "..............................Self Music INfo............................"
print self.music_info
def send_obj(self, addr, obj):
try :
try:
self.send_socket = socket.create_connection(addr, 10)
self.is_connected=True
except:
self.is_connected=False
print "+++++++++++++++++++++++Connection Problem++++++++++++++++++++++"
if self.is_connected:
# with open('pfile', 'wb') as f:
# pickle.dump(obj, f)
data = pickle.dumps(obj)
# with open('pfile', 'rb') as f:
# self.send_socket.sendall(f.read());
self.send_socket.sendall(data);
except Exception as inst:
print type(inst)
print inst
print "send_obj() exception. addr: %s obj: %s" % (addr, str(obj))
raise
def send_request(self, request_type, receiver_key, song_seq_num, cache_seq=-1):
self.logical_clk_lock.acquire()
self.logical_clk_time += 1
try :
self.streaming_addr=receiver_key
self.send_obj(receiver_key, Client_Request_Message(request_type, self.real_ip_address, self.username, self.app_start_time, self.logical_clk_time, self.session_table[receiver_key]['app_start_time'], song_seq_num, self.streaming_addr[1], cache_seq))
except Exception as inst:
print type(inst)
print inst
print "send_request() exception"
finally:
self.logical_clk_lock.release()
def send_rep(self, receiver_key, receiver_song_seq_num, cache_seq) :
self.send_request('REP', receiver_key, receiver_song_seq_num, cache_seq)
def send_like(self, receiver_key, song_seq_num):
self.send_request('LIKE', receiver_key, song_seq_num)
def send_stream(self, receiver_key, song_seq_num, owner_key, owner_song_seq_num):
self.send_request('STREAM', receiver_key, song_seq_num)
self.stream_ip=receiver_key[0];
self.stream_port=int(receiver_key[1]);
self.stream_song_num=int(song_seq_num)
#print "self.stream_ip",self.stream_ip
#print "self.stream_port",self.stream_port
print ".........................Stream Info..................................."
print "request song num :",self.stream_song_num
print "receive stream ip :",self.ip
print "receive stream port :",self.port
self.player.receiver_init(self.ip,self.port, self.stream_song_num, owner_key, owner_song_seq_num)
def send_C_Music(self, address, m_type):
self.logical_clk_lock.acquire()
self.logical_clk_time += 1
try :
self.music_info_lock.acquire()
# self.music_info = {1: '2'}
self.send_obj(address, Client_Music_Message(m_type, self.real_ip_address, self.username, self.app_start_time, self.logical_clk_time, self.music_info))
except Exception as inst:
print type(inst)
print inst
print "send_C_Music() exception addr %s obj: %s" % (address, self.music_info)
finally:
self.music_info_lock.release()
self.logical_clk_lock.release()
def multicast_C_Music(self, m_type):
print "multicasting music info to clients"
self.session_table_lock.acquire()
for k in self.session_table.keys() :
if k!=self.real_ip_address and k!=0 and k!=None :
self.send_C_Music(k, m_type)
self.session_table_lock.release()
def multicast_CCD(self):
self.multicast_C_Music('CCD')
def multicast_CCHB(self):
self.multicast_C_Music('CCHB')
def period_CCHB(self):
while True :
time.sleep(20)
self.multicast_CCHB()
def client_liveness_check(self):
liveness_threshold = 20
while True:
time.sleep(15)
self.session_table_lock.acquire()
for k in self.session_table.keys() :
if k != self.real_ip_address :
if(time.time() - self.session_table[k]['last_recv_time'] > liveness_threshold):
self.remove_lost_client(k)
self.session_table_lock.release()
def remove_lost_client(self,key):
# Delete client from all the tables
self.remove_session_table(key)
self.remove_music_table(key)
def remove_session_table(self,key):
del self.session_table[key]
def remove_music_table(self, key):
self.music_table_lock.acquire()
if key in self.music_table.keys():
del self.music_table[key]
self.music_table_lock.release()
def close_listen_port(self,port):
while True:
try:
command1="netstat -nltp |grep %s" % port
a=os.popen(command1).read()
if len(a)!=0:
try:
command1="kill -9 $(netstat -tlnp|grep %s | awk \'{ print $7 }\' |awk -F \'/\' \'{print $1 }\')" % port
os.system(command1)
except:
pass
else:
break
except:
pass
def look_up_cache(self, receiver_key, song_seq_num):
local_seq = -1
no_rep = True
rep = None
print 'look_up_cache: receiver_key: %s, song_seq_num: %s' % (receiver_key, song_seq_num)
if receiver_key not in self.music_table.keys() or song_seq_num not in self.music_table[receiver_key].keys():
print 'receiver_key: %s, song_seq_num: %s, not in table' % (receiver_key, song_seq_num)
return (local_seq, no_rep, rep)
print self.music_table
print 'in look_up: ', self.music_table[receiver_key][song_seq_num].rep_dict
if self.real_ip_address in self.music_table[receiver_key][song_seq_num].rep_dict.keys() :
# if self.listening_addr in self.music_table[receiver_key][song_seq_num].rep_dict.keys() :
# local_seq = self.music_table[receiver_key][song_seq_num].rep_dict[self.listening_addr]
local_seq = self.music_table[receiver_key][song_seq_num].rep_dict[self.real_ip_address]
print 'receiver_key: %s, song_seq_num: %s, in table with hit' % (receiver_key, song_seq_num)
no_rep = False
else :
rep_len = len(self.music_table[receiver_key][song_seq_num].rep_dict.items())
if rep_len == 0 :
print 'receiver_key: %s, song_seq_num: %s, in table without cache ' % (receiver_key, song_seq_num)
no_rep = True
else :
rep_items = self.music_table[receiver_key][song_seq_num].rep_dict.items()
rep_items.append((receiver_key, song_seq_num))
no_rep = False
rep = rep_items[random.randint(0, rep_len)]
print 'receiver_key: %s, song_seq_num: %s, in table with multiple cache ' % (receiver_key, song_seq_num)
return (local_seq, no_rep, rep)
def try_play(self, owner_key, owner_song_seq_num) :
if self.player.is_playing :
print "It is playing now"
self.player.pause()
self.player.stop()
if self.real_ip_address == owner_key and owner_song_seq_num in self.file_table.keys():
# if self.listening_addr == owner_key and owner_song_seq_num in self.file_table.keys():
print 'playing from local repo'
self.player.play(self.file_table[owner_song_seq_num])
else :
local_seq, no_rep, rep = self.look_up_cache(owner_key, owner_song_seq_num)
if no_rep == True :
print 'no cache; send request to owner: %s %s' % (owner_key, owner_song_seq_num)
self.send_stream(owner_key, owner_song_seq_num, owner_key, owner_song_seq_num)
elif rep != None :
print 'multiple cache; send request to one of them: %s %s, owner: %s %s' % (rep[0], rep[1], owner_key, owner_song_seq_num)
self.send_stream(rep[0], rep[1], owner_key, owner_song_seq_num)
else :
print 'play from local cache'
self.player.play(self.file_table[local_seq])
def open_listener(self):
self.listening_sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
# self.close_listen_port(self.port)
# self.close_listen_port(int(self.port+11))
# self.close_listen_port(int(self.port+12))
print "self.listening_addr ",self.listening_addr
try:
self.listening_sock.bind(self.listening_addr)
except:
pass
#self.listening_sock.bind(self.listening_addr)
self.listening_sock.listen(5)
def open_local_listener(self):
self.listening_sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
self.listening_addr = (socket.gethostbyname(socket.gethostname()), 0)
self.listening_addr = (str(self.getNetworkIp()), 0)
self.listening_sock.bind(self.listening_addr)
self.listening_addr = self.listening_sock.getsockname()
self.listening_sock.listen(5)
return self.listening_addr
def add_song(self,filepath):
repo_path = os.path.abspath(self.repo_path) # FIXME: path should be changed later
#check if song with same name exists
self.music_info_lock.acquire()
if(self.music_info_object.check_song_exists(self.music_info,filepath)==False):
# copy the file from current location to repo folder
shutil.copy(filepath,repo_path)
self.music_counter[0] +=1;
self.music_info_object.read_song(self.music_info,self.file_table,self.music_counter[0], filepath)
self.music_info_lock.release()
else:
self.music_info_lock.release()
print 'duplicate song already exists in library'
def add_cache(self, cache_path) :
self.music_info_lock.acquire()
self.music_counter[0] +=1;
seq = self.music_counter[0]
self.music_info_object.add_cache(self.file_table,self.music_counter[0], cache_path)
self.music_info_lock.release()
return seq
def add_song_server(self, filepath):
self.music_info_lock.acquire()
self.music_counter[0] +=1;
self.music_info_object.read_song(self.music_info,self.file_table,self.music_counter[0], filepath)
self.music_info_lock.release()
def remove_song(self,filepath) :
#check if song exists
self.music_info_lock.acquire()
#Remove song from song_dict/music_info
self.music_info_object.remove_song(self.music_info,self.file_table,filepath)
self.music_info_lock.release()
def top_ten(self):
song_list=[]
# print '-----------------------------------top 10--------------------------------------'
for user,song_info in self.music_table.items():
for seq,song in song_info.items():
user_info=(user,seq)
song_list.append((user_info,song))
# print 'song: ',
# print song
sorted_list = sorted(song_list,key=lambda x:x[1].like,reverse=True)
# print sorted_list
return sorted_list
def patch_music_table_rep(self, holder_key, holder_song_seq_num, rep_listening_addr, cache_seq_num) :
self.music_table_lock.acquire()
if holder_key in self.music_table.keys() and holder_song_seq_num in self.music_table[holder_key].keys() :
self.music_table[holder_key][holder_song_seq_num].add_rep(rep_listening_addr, cache_seq_num)
print 'in patch: ', self.music_table[holder_key][holder_song_seq_num].rep_dict
print self.music_table
else :
print 'not in table (%s, %s)' % (holder_key, holder_song_seq_num)
self.music_table_lock.release()
def run(self):
while (True) :
command_str = raw_input("> ");
if command_str == '' :
continue
command = command_str.split(' ');
if command[0] == 'user' :
self.username = command[1]
print "the self.listening_address is ,",self.listening_addr
self.init_username()
elif command[0] == 'SD' :
self.send_SD()
elif command[0] == 'listen' :
self.open_listener();
elif command[0] == 'like' :
self.send_like((command[1], int(command[2])), int(command[3]))
elif command[0] == 'stream' :
if self.player.is_playing:
print "It is playing now"
self.player.pause()
self.player.stop()
else:
print "I am lucky"
self.send_stream((command[1], int(command[2])), int(command[3]))
elif command[0] == 'add':
self.add_song(command[1])
elif command[0]=='remove':
self.remove_song(command[1])
elif command[0] == 'dump' :
self.dump_table()
elif command[0] == 'q' :
sys.exit()
elif command[0]=='pause':
self.player.pause()
elif command[0]=='resume':
self.player.resume()
elif command[0]=='stop':
self.player.stop()
elif command[0]=='replay':
if not self.player.check_cache_dic(self.stream_song_num):
self.send_stream((self.stream_ip,self.stream_port),self.stream_song_num)
elif command[0]=='play':
song_playing_flag=False
song_num=int(command[1])
for key in self.file_table.keys():
if key==song_num:
songpath=self.file_table[key]
self.player.play(songpath)
song_playing_flag=True
if song_playing_flag==False:
cachepath=self.player.traverse_cache_dic(song_num)
if len(cachepath)!=0:
self.player.play(cachepath)
else:
print "Sorry there is no that song in the repo"
else :
print "command not recognized"