"""asyncio exceptions."""


__all__ = ('CancelledError', 'InvalidStateError', 'TimeoutError',
 'IncompleteReadError', 'LimitOverrunError',
 'SendfileNotAvailableError')


class CancelledError(BaseException):
 """The Future or Task was cancelled."""


class TimeoutError(Exception):
 """The operation exceeded the given deadline."""


class InvalidStateError(Exception):
 """The operation is not allowed in this state."""


class SendfileNotAvailableError(RuntimeError):
 """Sendfile syscall is not available.

 Raised if OS does not support sendfile syscall for given socket or
 file type.
 """


class IncompleteReadError(EOFError):
 """
 Incomplete read error. Attributes:

 - partial: read bytes string before the end of stream was reached
 - expected: total number of expected bytes (or None if unknown)
 """
 def __init__(self, partial, expected):
 super().__init__(f'{len(partial)} bytes read on a total of '
 f'{expected!r} expected bytes')
 self.partial = partial
 self.expected = expected

 def __reduce__(self):
 return type(self), (self.partial, self.expected)


class LimitOverrunError(Exception):
 """Reached the buffer limit while looking for a separator.

 Attributes:
 - consumed: total number of to be consumed bytes.
 """
 def __init__(self, message, consumed):
 super().__init__(message)
 self.consumed = consumed

 def __reduce__(self):
 return type(self), (self.args[0], self.consumed)