INNER CODE UNIT · Python

bind_server_socket

omnirexflora-labs/omnicoreagent · src/omnicoreagent/serve/server.py:209

def bind_server_socket(host: str, port: int) -> socket.socket:
    """Take the port before the server starts up.

    uvicorn runs the app's startup, then binds; a startup that took 26-110 s
    (the 0.5.0rc2 gate) found a taken port only at the end, while clients
    polling it reached whatever held it.
    """
    family = socket.AF_INET6 if ":" in host else socket.AF_INET
    sock = socket.socket(family, socket.SOCK_STREAM)
    try:
        sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
        sock.bind((host, port))
        # Listening, not only bound: two sockets may both bind with
        # SO_REUSEADDR, and a second server starting meanwhile did (the
        # 0.5.0rc3 gate); only one can listen.
        sock.listen(2048)
    except OSError as exc:
        sock.close()

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