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#
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#
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"""Stream Exceptions.
"""

# Note: request.connection.write/read are used in this module, even though
# mod_python document says that they should be used only in connection
# handlers. Unfortunately, we have no other options. For example,
# request.write/read are not suitable because they don't allow direct raw bytes
# writing/reading.


# Exceptions
class ConnectionTerminatedException(Exception):
    """This exception will be raised when a connection is terminated
    unexpectedly.
    """

    pass


class InvalidFrameException(ConnectionTerminatedException):
    """This exception will be raised when we received an invalid frame we
    cannot parse.
    """

    pass


class BadOperationException(Exception):
    """This exception will be raised when send_message() is called on
    server-terminated connection or receive_message() is called on
    client-terminated connection.
    """

    pass


class UnsupportedFrameException(Exception):
    """This exception will be raised when we receive a frame with flag, opcode
    we cannot handle. Handlers can just catch and ignore this exception and
    call receive_message() again to continue processing the next frame.
    """

    pass


class InvalidUTF8Exception(Exception):
    """This exception will be raised when we receive a text frame which
    contains invalid UTF-8 strings.
    """

    pass


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