samples/iyi/socket.iyi

# Sockets: TCP client and server in one program on loopback.
#
#   ./bin/iyi run samples/iyi/socket.iyi
#
# Binds to an ephemeral port (port 0), connects, exchanges a message each way,
# prints what arrived, and closes cleanly.

module samples/socket

import std/socket::{IyiSocket}

# Server listens on an ephemeral port. The number the kernel picks is different
# on every run, so it is used rather than printed: `bench/arena_exercise.sh`
# runs every sample twice and asks for identical output, and a sample that
# prints its port is a sample that can never answer that.
server = IyiSocket.listen(0)
port = server.local_port
puts "server listening on an ephemeral port"

# Client connects to server on loopback
client = IyiSocket.connect("127.0.0.1", port).or_panic
client.write("hello from client\n")

# Server accepts and reads the message
conn = server.accept.or_panic
msg = conn.read(1024).or_panic
puts "server received: #{msg}"

# Server replies to client
conn.write("hello from server\n")
reply = client.read(1024).or_panic
puts "client received: #{reply}"

# Clean teardown
client.close
conn.close
server.close
puts "closed"