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annotate configmix/extras/aws.py @ 769:4a4d1323b282 default tip

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Doc what AWS partition is
author Franz Glasner <f.glasner@feldmann-mg.com>
date Mon, 19 Feb 2024 16:11:48 +0100
parents 665cc514a0cc
children
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1 # -*- coding: utf-8 -*-
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2 # :-
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3 # :Copyright: (c) 2015-2022, Franz Glasner. All rights reserved.
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4 # :License: BSD-3-Clause. See LICENSE.txt for details.
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5 # :-
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6 """AWS namespace implementation.
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7
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8 .. see:: - https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-instance-metadata.html
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9 - https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/instancedata-data-retrieval.html
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10 - https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/instance-identity-documents.html
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11 . IMDSv2: https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/instance-metadata-v2-how-it-works.html
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13 """
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14
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15 from __future__ import division, absolute_import, print_function
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18 __all__ = []
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20
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21 import requests
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22 import requests.exceptions
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23 import requests.adapters
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24 import urllib3
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26
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27 _MARKER = object()
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29
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30 #
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31 # These are for IMDSv1 (Instance Metadata Service)
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32 #
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33 # There is a new session-oriented IMDSv2 implementation using
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34 # IPv4 (169.254.169.254) and IPv6 ([fd00:ec2::254]).
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35 #
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36 URL_META_INSTANCEID = "http://169.254.169.254/latest/meta-data/instance-id"
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37 URL_META_REGION = "http://169.254.169.254/latest/meta-data/placement/region"
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38 # XXX FIXME: Use placement/availability-zone instead???
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39 URL_META_AVAILABILITY_ZONE = "http://169.254.169.254/latest/meta-data/availability-zone"
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40 #
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41 # XXX FIXME: also get the partition ("aws", "aws-cn" or "aws-us-gov")
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42 # (to be used in AWS ARNs)
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43 #
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44 URL_DYN_INSTANCE_IDENTITY_DOC = "http://169.254.169.254/latest/dynamic/instance-identity/document"
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45 TIMEOUT = 2
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46 # See https://gist.github.com/doublenns/7e3e4b72df4aaeccbeabf87ba767f44e
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47 RETRIES = urllib3.Retry(total=3, backoff_factor=0.3)
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48
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49 _meta_instanceid = None
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50 _meta_region = None
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51 _meta_availability_zone = None
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52 _dyn_instance_identity_doc = None
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55 def _get_text_req(url):
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56 with requests.Session() as sess:
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57 try:
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58 a = requests.adapters.HTTPAdapter(max_retries=RETRIES)
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59 sess.mount("http://", a)
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60 resp = sess.get(url, timeout=TIMEOUT)
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61 resp.raise_for_status()
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62 return resp.text
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63 except requests.exceptions.RequestException:
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64 return _MARKER
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66
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67 def _get_json_req(url):
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68 with requests.Session() as sess:
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69 try:
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70 a = requests.adapters.HTTPAdapter(max_retries=RETRIES)
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71 sess.mount("http://", a)
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72 resp = sess.get(url, timeout=TIMEOUT)
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73 resp.raise_for_status()
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74 return resp.json()
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75 except requests.exceptions.RequestException:
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76 return _MARKER
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77 except ValueError:
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78 # JSON error
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79 return _MARKER
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81
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82 def _get_meta_instanceid():
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83 global _meta_instanceid
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84 if _meta_instanceid is None:
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85 _meta_instanceid = _get_text_req(URL_META_INSTANCEID)
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86 return _meta_instanceid
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88
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89 def _get_meta_region():
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90 global _meta_region
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91 if _meta_region is None:
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92 _meta_region = _get_text_req(URL_META_REGION)
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93 return _meta_region
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95
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96 def _get_meta_avzone():
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97 global _meta_availability_zone
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98 if _meta_availability_zone is None:
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99 _meta_availability_zone = _get_text_req(URL_META_AVAILABILITY_ZONE)
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100 return _meta_availability_zone
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101
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102
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103 def _get_dyn_instance_identity_doc():
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104 global _dyn_instance_identity_doc
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105 if _dyn_instance_identity_doc is None:
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106 _dyn_instance_identity_doc = _get_json_req(
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107 URL_DYN_INSTANCE_IDENTITY_DOC)
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108 return _dyn_instance_identity_doc
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110
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111 def _awslookup(name, default=_MARKER):
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112 if name == "metadata.instance-id":
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113 v = _get_meta_instanceid()
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114 elif name == "metadata.placement.region":
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115 v = _get_meta_region()
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116 elif name == "metadata.placement.availability-zone":
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117 v = _get_meta_avzone()
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118 elif name.startswith("dynamic.instance-identity."):
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119 idoc = _get_dyn_instance_identity_doc()
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120 if idoc is _MARKER:
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121 v = _MARKER
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122 else:
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123 v = idoc.get(name[26:], _MARKER)
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124 else:
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125 v = _MARKER
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126 if v is _MARKER:
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127 if default is _MARKER:
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128 raise KeyError("key %r not found in the AWS namespace" % name)
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129 else:
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130 return default
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131 return v