1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
|
# -*- coding: utf-8 -*-
"""
pyxs.exceptions
~~~~~~~~~~~~~~~
This module implements a number of Python exceptions used by
:mod:`pyxs` classes.
:copyright: (c) 2011 by Selectel, see AUTHORS for more details.
:license: LGPL, see LICENSE for more details.
"""
__all__ = [
"InvalidOperation", "InvalidPayload", "InvalidPath", "InvalidPermission",
"ConnectionError", "UnexpectedPacket"
]
class PyXSError(Exception):
"""Base class for all :mod:`pyxs` exceptions."""
class InvalidOperation(ValueError, PyXSError):
"""Exception raised when :class:`~pyxs._internal.Packet` is passed
an operation, which isn't listed in :data:`~pyxs._internal.Op`.
:param int operation: invalid operation value.
"""
class InvalidPayload(ValueError, PyXSError):
"""Exception raised when :class:`~pyxs.Packet` is initialized with
payload, which exceeds 4096 bytes restriction or contains a
trailing ``NULL``.
:param bytes operation: invalid payload value.
"""
class InvalidPath(ValueError, PyXSError):
"""Exception raised when a path proccessed by a command doesn't
match the following constraints:
* its length should not exceed 3072 or 2048 for absolute and
relative path respectively.
* it should only consist of ASCII alphanumerics and the four
punctuation characters ``-/_@`` -- `hyphen`, `slash`, `underscore`
and `atsign`.
* it shouldn't have a trailing ``/``, except for the root path.
:param bytes path: invalid path value.
"""
class InvalidPermission(ValueError, PyXSError):
"""Exception raised for permission which don't match the following
format::
w<domid> write only
r<domid> read only
b<domid> both read and write
n<domid> no access
:param bytes perm: invalid permission value.
"""
class ConnectionError(PyXSError):
"""Exception raised for failures during socket operations."""
class UnexpectedPacket(ConnectionError):
"""Exception raised when received packet header doesn't match the
header of the packet sent, for example if outgoing packet has
``op = Op.READ`` the incoming packet is expected to have
``op = Op.READ`` as well.
"""
|
