Server support for protocols

[joamag]

Design changes

• Follow-up on New client implementation for protocols #24
• Merge of the server and client base infrastructure under common.py (server(), socket_tcp(), socket_udp())
• More server-related methods in the compat.py file

Current Status

• Echo UDP server (EchoServerProtocol) already working
• EchoProtocol is the one used for the testing

What is still missing

• Proper HTTPserver support (Echo HTTP Server) working

Testing

To run the echo server Protocol implementation using netius run:

PYTHONPATH=. python3 netius/servers/echo.py 

To use the compat version meaning that an asyncio-like interface will be used underneath the hoods use:

COMPAT=1 PYTHONPATH=. python3 netius/servers/echo.py

This PR is related to #23

[coveralls]

Coverage decreased (-0.3%) to 45.515% when pulling b65de59 on protocols/server into 2568f6c on master.

[joamag]

There's still part of the server API that is pending implementation.

[joamag]

Some initial notes on how to approach the challenge:

• Define goals - proper assertions to be full filled
• create some unit tests
• Build incrementally

[joamag]

⚠️ I'm merging this code even though it's currently a work in progress so that we ca move forward with major code re-structure (black format) ⚠️

There should exist an immediate followup PR to re-open the on going work for server implementation.

[joamag]

⚠️ I'm merging this code even though it's currently a work in progress so that we ca move forward with major code re-structure (black format) ⚠️

There should exist an immediate followup PR to re-open the on going work for server implementation.

CC: @hugo-gomes