Function handler

tests/sync/server.py:18–30

(ws)

def handler(ws):
    path = urllib.parse.urlparse(ws.request.path).path
    if path == "/":
        # The default path is an eval shell.
        for expr in ws:
            value = eval(expr)
            ws.send(str(value))
    elif path == "/crash":
        raise RuntimeError
    elif path == "/no-op":
        pass
    else:
        raise AssertionError(f"unexpected path: {path}")


class EvalShellMixin: