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Assignment 3 #70

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f740209
Update echo_client.py
duane-wright Jan 13, 2014
3a3a667
Update echo_server.py
duane-wright Jan 13, 2014
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37 changes: 32 additions & 5 deletions assignments/session01/echo_client.py
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Original file line number Diff line number Diff line change
Expand Up @@ -4,17 +4,31 @@

def client(msg, log_buffer=sys.stderr):
server_address = ('localhost', 10000)

# server_address = ('127.0.0.1', 10000)

# TODO: Replace the following line with your code which will instantiate
# a TCP socket with IPv4 Addressing, call the socket you make 'sock'
sock = None

# sock = None

sock = socket.socket(
socket.AF_INET,
socket.SOCK_STREAM,
socket.IPPROTO_IP)

print >>log_buffer, 'connecting to {0} port {1}'.format(*server_address)
# TODO: connect your socket to the server here.

sock.connect((server_address))

# this try/finally block exists purely to allow us to close the socket
# when we are finished with it
try:
print >>log_buffer, 'sending "{0}"'.format(msg)
# TODO: send your message to the server here.

sock.sendall(msg)

# TODO: the server should be sending you back your message as a series
# of 16-byte chunks. You will want to log them as you receive
Expand All @@ -24,13 +38,26 @@ def client(msg, log_buffer=sys.stderr):
#
# Make sure that you log each chunk you receive. Use the print
# statement below to do it. (The tests expect this log format)
chunk = ''
print >>log_buffer, 'received "{0}"'.format(chunk)

# chunk = ''

while True:

chunk = sock.recv(16)

print >>log_buffer, 'received "{0}"'.format(chunk)

if len(chunk) == 0:
break

finally:
# TODO: after you break out of the loop receiving echoed chunks from
# the server you will want to close your client socket.
print >>log_buffer, 'closing socket'


sock.close()

sys.exit(1)

if __name__ == '__main__':
if len(sys.argv) != 2:
Expand All @@ -39,4 +66,4 @@ def client(msg, log_buffer=sys.stderr):
sys.exit(1)

msg = sys.argv[1]
client(msg)
client(msg)
46 changes: 40 additions & 6 deletions assignments/session01/echo_server.py
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Original file line number Diff line number Diff line change
Expand Up @@ -7,16 +7,28 @@ def server(log_buffer=sys.stderr):
address = ('127.0.0.1', 10000)
# TODO: Replace the following line with your code which will instantiate
# a TCP socket with IPv4 Addressing, call the socket you make 'sock'
sock = None

# sock = None

sock = socket.socket(
socket.AF_INET,
socket.SOCK_STREAM,
socket.IPPROTO_IP)

# TODO: Set an option to allow the socket address to be reused immediately
# see the end of http://docs.python.org/2/library/socket.html

sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)

# log that we are building a server
print >>log_buffer, "making a server on {0}:{1}".format(*address)

# TODO: bind your new sock 'sock' to the address above and begin to listen
# for incoming connections

sock.bind((address))
sock.listen(1)

try:
# the outer loop controls the creation of new connection sockets. The
# server will handle each incoming connection one at a time.
Expand All @@ -28,7 +40,11 @@ def server(log_buffer=sys.stderr):
# the client so we can report it below. Replace the
# following line with your code. It is only here to prevent
# syntax errors
addr = ('bar', 'baz')

# addr = ('bar', 'baz')

conn, addr = sock.accept()

try:
print >>log_buffer, 'connection - {0}:{1}'.format(*addr)

Expand All @@ -41,29 +57,47 @@ def server(log_buffer=sys.stderr):
# following line with your code. It's only here as
# a placeholder to prevent an error in string
# formatting
data = ''

# data = ''

data = conn.recv(16)

print >>log_buffer, 'received "{0}"'.format(data)

# TODO: you will need to check here to see if any data was
# received. If so, send the data you got back to
# the client. If not, exit the inner loop and wait
# for a new connection from a client

if len(data) > 0:
conn.sendall(data)

else:
break


finally:
# TODO: When the inner loop exits, this 'finally' clause will
# be hit. Use that opportunity to close the socket you
# created above when a client connected. Replace the
# call to `pass` below, which is only there to prevent
# syntax problems
pass

# pass

conn.close()

except KeyboardInterrupt:
# TODO: Use the python KeyboardIntterupt exception as a signal to
# close the server socket and exit from the server function.
# Replace the call to `pass` below, which is only there to
# prevent syntax problems
pass

# pass

sock.close()


if __name__ == '__main__':
server()
sys.exit(0)
sys.exit(0)