41 lines
1.4 KiB
Python
41 lines
1.4 KiB
Python
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from .selectors import (
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HAS_SELECT,
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DefaultSelector,
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EVENT_READ,
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EVENT_WRITE
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)
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def _wait_for_io_events(socks, events, timeout=None):
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""" Waits for IO events to be available from a list of sockets
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or optionally a single socket if passed in. Returns a list of
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sockets that can be interacted with immediately. """
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if not HAS_SELECT:
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raise ValueError('Platform does not have a selector')
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if not isinstance(socks, list):
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# Probably just a single socket.
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if hasattr(socks, "fileno"):
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socks = [socks]
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# Otherwise it might be a non-list iterable.
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else:
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socks = list(socks)
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with DefaultSelector() as selector:
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for sock in socks:
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selector.register(sock, events)
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return [key[0].fileobj for key in
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selector.select(timeout) if key[1] & events]
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def wait_for_read(socks, timeout=None):
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""" Waits for reading to be available from a list of sockets
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or optionally a single socket if passed in. Returns a list of
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sockets that can be read from immediately. """
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return _wait_for_io_events(socks, EVENT_READ, timeout)
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def wait_for_write(socks, timeout=None):
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""" Waits for writing to be available from a list of sockets
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or optionally a single socket if passed in. Returns a list of
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sockets that can be written to immediately. """
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return _wait_for_io_events(socks, EVENT_WRITE, timeout)
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