bpo-34622: Extract asyncio exceptions into a separate module (GH-9141)
diff --git a/Lib/asyncio/exceptions.py b/Lib/asyncio/exceptions.py
new file mode 100644
index 0000000..cac31a5
--- /dev/null
+++ b/Lib/asyncio/exceptions.py
@@ -0,0 +1,60 @@
+"""asyncio exceptions."""
+
+
+__all__ = ('CancelledError', 'InvalidStateError', 'TimeoutError',
+ 'IncompleteReadError', 'LimitOverrunError',
+ 'SendfileNotAvailableError')
+
+import concurrent.futures
+from . import base_futures
+
+
+class CancelledError(concurrent.futures.CancelledError):
+ """The Future or Task was cancelled."""
+
+
+class TimeoutError(concurrent.futures.TimeoutError):
+ """The operation exceeded the given deadline."""
+
+
+class InvalidStateError(concurrent.futures.InvalidStateError):
+ """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)