Mercurial > hgrepos > Python > libs > ConfigMix

annotate configmix/extras/aws.py @ 499:f46932e8a84c

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Configuration._lookupvar() now uses an internal cache (positive and negative). This give a nice performance boost.
author Franz Glasner <fzglas.hg@dom66.de>
date Sat, 18 Dec 2021 00:43:36 +0100
parents eed16a1ec8f3
children f454889e41fa
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1 # -*- coding: utf-8 -*-
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2 # :-
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3 # :Copyright: (c) 2015-2020, 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
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12 """
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13
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14 from __future__ import division, absolute_import, print_function
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17 __all__ = []
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19
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20 import requests
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21 import requests.exceptions
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22 import requests.adapters
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23 import urllib3
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25
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26 _MARKER = object()
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28
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29 URL_META_INSTANCEID = "http://169.254.169.254/latest/meta-data/instance-id"
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30 URL_META_REGION = "http://169.254.169.254/latest/meta-data/placement/region"
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31 URL_META_AVAILABILITY_ZONE = "http://169.254.169.254/latest/meta-data/availability-zone"
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32 URL_DYN_INSTANCE_IDENTITY_DOC = "http://169.254.169.254/latest/dynamic/instance-identity/document"
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33 TIMEOUT = 2
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34 # See https://gist.github.com/doublenns/7e3e4b72df4aaeccbeabf87ba767f44e
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35 RETRIES = urllib3.Retry(total=3, backoff_factor=0.3)
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36
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37 _meta_instanceid = None
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38 _meta_region = None
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39 _meta_availability_zone = None
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40 _dyn_instance_identity_doc = None
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43 def _get_text_req(url):
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44 with requests.Session() as sess:
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45 try:
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46 a = requests.adapters.HTTPAdapter(max_retries=RETRIES)
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47 sess.mount("http://", a)
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48 resp = sess.get(url, timeout=TIMEOUT)
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49 resp.raise_for_status()
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50 return resp.text
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51 except requests.exceptions.RequestException:
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52 return _MARKER
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55 def _get_json_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.json()
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63 except requests.exceptions.RequestException:
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64 return _MARKER
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65 except ValueError:
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66 # JSON error
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67 return _MARKER
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69
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70 def _get_meta_instanceid():
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71 global _meta_instanceid
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72 if _meta_instanceid is None:
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73 _meta_instanceid = _get_text_req(URL_META_INSTANCEID)
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74 return _meta_instanceid
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75
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76
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77 def _get_meta_region():
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78 global _meta_region
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79 if _meta_region is None:
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80 _meta_region = _get_text_req(URL_META_REGION)
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81 return _meta_region
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82
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83
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84 def _get_meta_avzone():
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85 global _meta_availability_zone
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86 if _meta_availability_zone is None:
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87 _meta_availability_zone = _get_text_req(URL_META_AVAILABILITY_ZONE)
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88 return _meta_availability_zone
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89
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90
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91 def _get_dyn_instance_identity_doc():
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92 global _dyn_instance_identity_doc
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93 if _dyn_instance_identity_doc is None:
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94 _dyn_instance_identity_doc = _get_json_req(
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95 URL_DYN_INSTANCE_IDENTITY_DOC)
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96 return _dyn_instance_identity_doc
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97
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98
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99 def _awslookup(name, default=_MARKER):
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100 if name == "metadata.instance-id":
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101 v = _get_meta_instanceid()
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102 elif name == "metadata.placement.region":
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103 v = _get_meta_region()
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104 elif name == "metadata.placement.availability-zone":
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105 v = _get_meta_avzone()
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106 elif name.startswith("dynamic.instance-identity."):
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107 idoc = _get_dyn_instance_identity_doc()
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108 if idoc is _MARKER:
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109 v = _MARKER
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110 else:
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111 v = idoc.get(name[26:], _MARKER)
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112 else:
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113 v = _MARKER
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114 if v is _MARKER:
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115 if default is _MARKER:
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116 raise KeyError("key %r not found in the AWS namespace" % name)
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117 else:
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118 return default
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119 return v