Coverage for /pythoncovmergedfiles/medio/medio/usr/local/lib/python3.11/site-packages/selkies/ice/utils.py: 47%

1# This Source Code Form is subject to the terms of the Mozilla Public 

2# License, v. 2.0. If a copy of the MPL was not distributed with this 

3# file, You can obtain one at https://mozilla.org/MPL/2.0/. 

4# 

5# This file incorporates work covered by the following copyright and 

6# permission notice: 

7# 

8# Copyright (c) 2018-2019 Jeremy Lainé. 

9# All rights reserved. 

10# 

11# Redistribution and use in source and binary forms, with or without 

12# modification, are permitted provided that the following conditions are met: 

13# 

14# * Redistributions of source code must retain the above copyright notice, 

15# this list of conditions and the following disclaimer. 

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32# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 

33 

34import os 

35import secrets 

36import string 

37from typing import Optional 

38 

39 

40def random_string(length: int) -> str: 

41 allchar = string.ascii_letters + string.digits 

42 return "".join(secrets.choice(allchar) for x in range(length)) 

43 

44 

45def random_transaction_id() -> bytes: 

46 return os.urandom(12) 

47 

48 

49def bind_errno(exc: OSError) -> Optional[int]: 

50 """The kernel's code for a bind failure, wherever the loop left it. 

51 

52 uvloop reports a datagram bind it could not place as an OSError of its own 

53 that carries no code and keeps the kernel's on the cause, so whether 

54 another port could succeed is decided from there; a code on the failure 

55 itself is the loop's own and wins. 

56 

57 Returns: 

58 The errno, or None when neither the failure nor its cause carries one. 

59 """ 

60 if exc.errno is not None: 

61 return exc.errno 

62 cause = exc.__cause__ 

63 return cause.errno if isinstance(cause, OSError) else None