--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/configmix/extras/aws.py	Mon Dec 07 01:06:33 2020 +0100
@@ -0,0 +1,107 @@
+# -*- coding: utf-8 -*-
+# :-
+# :Copyright: (c) 2015-2020, Franz Glasner. All rights reserved.
+# :License:   3-clause BSD. See LICENSE.txt for details.
+# :-
+"""AWS namespace implementation
+
+"""
+
+from __future__ import division, absolute_import, print_function
+
+
+__all__ = []
+
+
+import requests
+import requests.exceptions
+
+
+_MARKER = object()
+
+
+URL_META_INSTANCEID = "http://169.254.169.254/latest/meta-data/instance-id"
+URL_META_REGION = "http://169.254.169.254/latest/meta-data/placement/region"
+URL_META_AVAILABILITY_ZONE = "http://169.254.169.254/latest/meta-data/availability-zone"
+URL_DYN_INSTANCE_IDENTITY_DOC = "http://169.254.169.254/latest/dynamic/instance-identity/document"
+TIMEOUT = 10
+
+_meta_instanceid = None
+_meta_region = None
+_meta_availability_zone = None
+_dyn_instance_identity_doc = None
+
+
+def _get_text_req(url):
+    with requests.Session() as sess:
+        try:
+            resp = sess.get(url, timeout=TIMEOUT)
+            resp.raise_for_status()
+            return resp.text
+        except requests.exceptions.RequestException:
+            return _MARKER
+
+
+def _get_json_req(url):
+    with requests.Session() as sess:
+        try:
+            resp = sess.get(url, timeout=TIMEOUT)
+            resp.raise_for_status()
+            return resp.json()
+        except requests.exceptions.RequestException:
+            return _MARKER
+        except ValueError:
+            # JSON error
+            return _MARKER
+
+
+def _get_meta_instanceid():
+    global _meta_instanceid
+    if _meta_instanceid is None:
+        _meta_instanceid = _get_text_req(URL_META_INSTANCEID)
+    return _meta_instanceid
+
+
+def _get_meta_region():
+    global _meta_region
+    if _meta_region is None:
+        _meta_region = _get_text_req(URL_META_REGION)
+    return _meta_region
+
+
+def _get_meta_avzone():
+    global _meta_availability_zone
+    if _meta_availability_zone is None:
+        _meta_availability_zone = _get_text_req(URL_META_AVAILABILITY_ZONE)
+    return _meta_availability_zone
+
+
+def _get_dyn_instance_identity_doc():
+    global _dyn_instance_identity_doc
+    if _dyn_instance_identity_doc is None:
+        _dyn_instance_identity_doc = _get_json_req(
+            URL_DYN_INSTANCE_IDENTITY_DOC)
+    return _dyn_instance_identity_doc
+
+
+def _awslookup(name, default=_MARKER):
+    if name == "metadata.instance-id":
+        v = _get_meta_instanceid()
+    elif name == "metadata.placement.region":
+        v = _get_meta_region()
+    elif name == "metadata.placement.availability-zone":
+        v = _get_meta_avzone()
+    elif name.startswith("dynamic.instance-identity."):
+        idoc = _get_dyn_instance_identity_doc()
+        if idoc is _MARKER:
+            v = _MARKER
+        else:
+            v = idoc.get(name[26:], _MARKER)
+    else:
+        v = _MARKER
+    if v is _MARKER:
+        if default is _MARKER:
+            raise KeyError("key %r not found in the AWS namespace" % name)
+        else:
+            return default
+    return v