python client notes

Hi all, these are my personal notes.

So I can print them out and sticky tape them to my wall.

Please note: A fantastic tutorial I reference from is BinaryTides. Found here 

I am breaking this tutorial up into my own notes, to jog my memory. So it is not a tutorial for others to follow, however if it is useful, its useful ! :)


Now "haydn" (aka me), python network programming requires a socket.

	import socket #for sockets
	#create an AF_INET, STREAM socket (TCP)
	s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
	print 'Socket Created'

view raw sock creation hosted with ❤ by GitHub

test


Now we need to get an IP address of a remote host/url
as such we connect to google

Note to self: Copy pasting looks way better than creating via Gist, saves time too!!

host = 'www.google.com'

try:

    remote_ip = socket.gethostbyname( host )

except socket.gaierror:

    #could not resolve

    print 'Hostname could not be resolved. Exiting'

    sys.exit()

     

print 'Ip address of ' + host + ' is ' + remote_ip








Now we have the IP address we can connect to it on a certain port
simply use s.connect

#Connect to remote server

s.connect((remote_ip , port))

print 'Socket Connected to ' + host + ' on ip ' + remote_ip











But we need to add the port we wish to connect to


host = 'www.google.com'

port = 80




Thats making a socket and connecting to a server.

To Send data we do 

sendall(message) 




message = "GET / HTTP/1.1\r\n\r\n"

try :

    #Set the whole string

    s.sendall(message)

except socket.error:

    #Send failed

    print 'Send failed'

    sys.exit()

print 'Message send successfully'







To receive data:
s.recv(4096) 




#Now receive data

reply = s.recv(4096)

print reply










Closing a socket
s.close()