Python chat application (multi)client-server model
You can have multiple clients connecting to the server. The above program runns in you local host i.e 127.0.0.1 Underneat it use the standard Unix select() function.
python3 server.py
python3 client.py
For a server using 0.0.0.0 means to listen on all available interfaces, useful to connect locally to 127.0.0.1 and remotely to LAN interface IP
1. Create a socket
2. socket.AF_INET - address family, IPv4, some otehr possible are AF_INET6, AF_BLUETOOTH, AF_UNIX
3. socket.SOCK_STREAM - TCP
4. Bind, so server informs operating system that it's going to use given IP and port
5. List of sockets for select.select()
6. List of connected clients - socket as a key, user header and name as data
1. You create a socket
2. socket.AF_INET - address family, IPv4, some otehr possible are AF_INET6, AF_BLUETOOTH, AF_UNIX
3. socket.SOCK_STREAM - TCP, conection-based, socket.SOCK_DGRAM - UDP, connectionless, datagrams, socket.SOCK_RAW - raw IP packets
4. Connect to a given ip and port
5. Set connection to non-blocking state, so .recv() call won;t block, just return some exception we'll handle
6. Prepare username and header and send them
