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