Function get_subprocess

uvicorn/_subprocess.py:21–51

Called in the parent process, to instantiate a new child process instance. The child is not yet started at this point. * config - The Uvicorn configuration instance. * target - A callable that accepts a list of sockets. In practice this will be the `Server.run()` met

(
    config: Config,
    target: Callable[..., None],
    sockets: list[socket],
)

def get_subprocess(
    config: Config,
    target: Callable[..., None],
    sockets: list[socket],
) -> SpawnProcess:
    """
    Called in the parent process, to instantiate a new child process instance.
    The child is not yet started at this point.

    * config - The Uvicorn configuration instance.
    * target - A callable that accepts a list of sockets. In practice this will
               be the `Server.run()` method.
    * sockets - A list of sockets to pass to the server. Sockets are bound once
                by the parent process, and then passed to the child processes.
    """
    # We pass across the stdin fileno, and reopen it in the child process.
    # This is required for some debugging environments.
    try:
        stdin_fileno = sys.stdin.fileno()
    # The `sys.stdin` can be `None`, see https://docs.python.org/3/library/sys.html#sys.__stdin__.
    except (AttributeError, OSError):
        stdin_fileno = None

    kwargs = {
        "config": config,
        "target": target,
        "sockets": sockets,
        "stdin_fileno": stdin_fileno,
    }

    return spawn.Process(target=subprocess_started, kwargs=kwargs)


def subprocess_started(