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-rw-r--r--cloudinit/ec2_utils.py135
1 files changed, 135 insertions, 0 deletions
diff --git a/cloudinit/ec2_utils.py b/cloudinit/ec2_utils.py
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+++ b/cloudinit/ec2_utils.py
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+# vi: ts=4 expandtab
+#
+# Copyright (C) 2012 Yahoo! Inc.
+#
+# Author: Joshua Harlow <harlowja@yahoo-inc.com>
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License version 3, as
+# published by the Free Software Foundation.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+import json
+import urllib
+
+from cloudinit import log as logging
+from cloudinit import url_helper as uh
+from cloudinit import util
+
+LOG = logging.getLogger(__name__)
+
+
+# For now take this and fix it...
+class LazyLoadMetadata(dict):
+ def __init__(self, url, fetch_timeout, num_retries, ssl_details):
+ self._url = url
+ self._num_retries = num_retries
+ self._ssl_details = ssl_details
+ self._fetch_timeout = fetch_timeout
+ self._leaves = {}
+ self._dicts = []
+ response = uh.readurl(url, timeout=fetch_timeout,
+ retries=num_retries, ssl_details=ssl_details)
+ data = str(response)
+ if data:
+ fields = data.split('\n')
+ for field in fields:
+ if field.endswith('/'):
+ key = field[0:-1]
+ self._dicts.append(key)
+ else:
+ p = field.find('=')
+ if p > 0:
+ key = field[p + 1:]
+ resource = field[0:p] + '/openssh-key'
+ else:
+ key = resource = field
+ self._leaves[key] = resource
+ self[key] = None
+
+ def _materialize(self):
+ for key in self:
+ self[key]
+
+ def __getitem__(self, key):
+ if key not in self:
+ # Allow dict to throw the KeyError
+ return super(LazyLoadMetadata, self).__getitem__(key)
+
+ # Already loaded
+ val = super(LazyLoadMetadata, self).__getitem__(key)
+ if val is not None:
+ return val
+
+ if key in self._leaves:
+ resource = self._leaves[key]
+ new_url = self._url + urllib.quote(resource, safe="/:")
+ response = uh.readurl(new_url, retries=self._num_retries,
+ timeout=self._fetch_timeout,
+ ssl_details=self._ssl_details)
+ val = str(response)
+ if val and val[0] == '{':
+ val = json.loads(val)
+ else:
+ p = val.find('\n')
+ if p > 0:
+ val = val.split('\n')
+ self[key] = val
+ elif key in self._dicts:
+ new_url = self._url + key + '/'
+ self[key] = LazyLoadMetadata(new_url,
+ num_retries=self._num_retries,
+ fetch_timeout=self._fetch_timeout,
+ ssl_details=self._ssl_details)
+
+ return super(LazyLoadMetadata, self).__getitem__(key)
+
+ def get(self, key, default=None):
+ try:
+ return self[key]
+ except KeyError:
+ return default
+
+ def values(self):
+ self._materialize()
+ return super(LazyLoadMetadata, self).values()
+
+ def items(self):
+ self._materialize()
+ return super(LazyLoadMetadata, self).items()
+
+ def __str__(self):
+ self._materialize()
+ return super(LazyLoadMetadata, self).__str__()
+
+ def __repr__(self):
+ self._materialize()
+ return super(LazyLoadMetadata, self).__repr__()
+
+
+def get_instance_userdata(url, version='latest', ssl_details=None):
+ ud_url = '%s/%s/user-data' % (url, version)
+ try:
+ response = uh.readurl(ud_url, timeout=5,
+ retries=10, ssl_details=ssl_details)
+ return str(response)
+ except Exception as e:
+ util.logexc(LOG, "Failed fetching url %s", ud_url)
+ return None
+
+
+def get_instance_metadata(url, version='latest', ssl_details=None):
+ md_url = '%s/%s/meta-data' % (url, version)
+ try:
+ return LazyLoadMetadata(md_url, timeout=5,
+ retries=10, ssl_details=ssl_details)
+ except Exception as e:
+ util.logexc(LOG, "Failed fetching url %s", md_url)
+ return None