programs hangs during socket interaction
- by herrturtur
I have two programs, sendfile.py and recvfile.py that are supposed to interact to send a file across the network. They communicate over TCP sockets. The communication is supposed to go something like this:
sender =====filename=====> receiver
sender <===== 'ok' ======= receiver
or
sender <===== 'no' ======= receiver
if ok:
sender ====== file ======> receiver
I've got
The sender and receiver code is here:
Sender:
import sys
from jmm_sockets import *
if len(sys.argv) != 4:
print "Usage:", sys.argv[0], "<host> <port> <filename>"
sys.exit(1)
s = getClientSocket(sys.argv[1], int(sys.argv[2]))
try:
f = open(sys.argv[3])
except IOError, msg:
print "couldn't open file"
sys.exit(1)
# send filename
s.send(sys.argv[3])
# receive 'ok'
buffer = None
response = str()
while 1:
buffer = s.recv(1)
if buffer == '':
break
else:
response = response + buffer
if response == 'ok':
print 'receiver acknowledged receipt of filename'
# send file
s.send(f.read())
elif response == 'no':
print "receiver doesn't want the file"
# cleanup
f.close()
s.close()
Receiver:
from jmm_sockets import *
s = getServerSocket(None, 16001)
conn, addr = s.accept()
buffer = None
filename = str()
# receive filename
while 1:
buffer = conn.recv(1)
if buffer == '':
break
else:
filename = filename + buffer
print "sender wants to send", filename, "is that ok?"
user_choice = raw_input("ok/no: ")
if user_choice == 'ok':
# send ok
conn.send('ok')
#receive file
data = str()
while 1:
buffer = conn.recv(1)
if buffer=='':
break
else:
data = data + buffer
print data
else:
conn.send('no')
conn.close()
I'm sure I'm missing something here in the sorts of a deadlock, but don't know what it is.
