1 #!Nonblocking I/O - Chapter 5 -pollclient.py
2 import socket,sys,select
3 port=51423
4 host='localhost'
5
6 spinsize=10
7 spinpos=0
8 spindir=1
9
10 def spin():
11 global spinsize,spinpos,spindir
12 spinstr='.'*spinpos+'|'+'.'*(spinsize-spinpos-1)
13 sys.stdout.write('\r'+spinstr+' ')
14 sys.stdout.flush()
15
16 spinpos+=spindir
17 if spinpos<0:
18 spindir=1
19 spinpos=1
20 elif spinpos>=spinsize:
21 spinpos-=2
22 spindir=-1
23
24 sock=socket.socket(socket.AF_INET,socket.SOCK_STREAM)
25 sock.connect((host,port))
26
27 p=select.poll()
28 p.register(sock.fileno(),select.POLLIN|select.POLLERR|select.POLLHUP)
29
30 while True:
31 results=p.poll(2002)
32 if len(results):
33 if results[0][1]==select.POLLIN:
34 data=sock.recv(4096).decode()
35 if not len(data):
36 print("\rRemote end closed connection; exiting.")
37 break
38 sys.stdout.write("\rReceived :"+data)
39 sys.stdout.flush()
40 spin()
41 else:
42 print("\rProblem occurred; exiting")
43 sys.exit(0)
1 #!Delaying Server - Chapter 5 -delayserver.py
2 import socket,traceback,time
3
4 host=""
5 port=51423
6
7 sock=socket.socket(socket.AF_INET,socket.SOCK_STREAM)
8 sock.setsockopt(socket.SOL_SOCKET,socket.SO_REUSEADDR,1)
9 sock.bind((host,port))
10 sock.listen(1)
11
12 while True:
13 try:
14 clientsock,clientaddr= sock.accept()
15 except KeyboardInterrupt:
16 raise
17 except:
18 traceback.print_exc()
19 continue
20
21 try:
22 print("Got connection from ",clientsock.getpeername)
23 while True:
24 try:
25 print(time.asctime().encode())
26 clientsock.sendall(time.asctime().encode()+b"\n")
27 except:
28 break
29 time.sleep(2)
30 except (KeyboardInterrupt,SystemExit):
31 raise
32 except:
33 traceback.print_exc()
34
35 try:
36 clientsock.close()
37 except KeyboardInterrupt:
38 raise
39 except:
40 traceback.print_exc()
