tcp_echo_server/ - docker container, tcp echo server which response with uppercase - docker build -t tcp_echo_server . - docker run --rm -p 5000:5000 -it tcp_echo_server

test/asyncio_tcp_client.py - test proxy with runing n connections with random lowercase string

tcp_proxy - dir with increasing versions of tcp_proxy ss -ta |wc -l - count number of all TCP sockets

Test with:

1. manual:
   • nc: nc localhost 5000 or echo "hello" |nc localhost 5000
   • telnet
2. auto:

• ./test/001-test_tcp.py python script, run with -h flag to get help

Structure

tcp_echo_server/

• 001-simple_one_echo.py - basic echo server.
  • no logs (TODO)-> logging module
  • no configuration -> OOP approach, create Server class and keep config in attributes, NEXT Server class as singleton
  • no args from cli -> argparse module
  • no loop feat. connection close after one echo -> add loop feat.
  • no concurrency
  • no signal SIGINT handling
  • no annotation
• 002-x:
  • added logging module, no print() anymore
  • added Server class, clear structure and explicite server config at class instance initalization
• 003-x:
  • added loop to handle multiple calls from one client
  • TODO: DEBUG: try tcpdup echo "hello" | nc localhost 5000 after this call nc still interactive but server do not get any more calls.
  • added Server static method get_socket_options
  • log server socket options
  • TODO: DEBUG: what each socket option do?
• 004-x:
  • handle multiple conn in sequential manner.
  • added SIGING handling to gracefull shutdown
• 005-x:
  • concurrency: threading, pool count handle by semaphore + acquire()/release()
  • added Server.handle_conn method
  • logging Thread ID and current running treads (based on semaphore count)
  • closing client conn at gracefull shutdown
  • DEBUG: when tested with 1k it get timout and when gracefull shutdown -> hangs, it seems that thread is hanging, check with ps -p <PID> -T -f
  • added timeout on clinet socket

test/

1. x
2. 002:
   • refactor code to sleep between each task to not run all conn at once