Scripts to download files from google storage based on sha1 sums

third_party/gsutil/boto/ec2/ec2object.py

+# Copyright (c) 2006-2010 Mitch Garnaat http://garnaat.org/
+# Copyright (c) 2010, Eucalyptus Systems, Inc.
+#
+# Permission is hereby granted, free of charge, to any person obtaining a
+# copy of this software and associated documentation files (the
+# "Software"), to deal in the Software without restriction, including
+# without limitation the rights to use, copy, modify, merge, publish, dis-
+# tribute, sublicense, and/or sell copies of the Software, and to permit
+# persons to whom the Software is furnished to do so, subject to the fol-
+# lowing conditions:
+#
+# The above copyright notice and this permission notice shall be included
+# in all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+# OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABIL-
+# ITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
+# SHALL THE AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, 
+# WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+# IN THE SOFTWARE.
+
+"""
+Represents an EC2 Object
+"""
+from boto.ec2.tag import TagSet
+
+class EC2Object(object):
+
+    def __init__(self, connection=None):
+        self.connection = connection
+        if self.connection and hasattr(self.connection, 'region'):
+            self.region = connection.region
+        else:
+            self.region = None
+
+    def startElement(self, name, attrs, connection):
+        return None
+
+    def endElement(self, name, value, connection):
+        setattr(self, name, value)
+
+    
+class TaggedEC2Object(EC2Object):
+    """
+    Any EC2 resource that can be tagged should be represented
+    by a Python object that subclasses this class.  This class
+    has the mechanism in place to handle the tagSet element in
+    the Describe* responses.  If tags are found, it will create
+    a TagSet object and allow it to parse and collect the tags
+    into a dict that is stored in the "tags" attribute of the
+    object.
+    """
+
+    def __init__(self, connection=None):
+        EC2Object.__init__(self, connection)
+        self.tags = TagSet()
+
+    def startElement(self, name, attrs, connection):
+        if name == 'tagSet':
+            return self.tags
+        else:
+            return None
+
+    def add_tag(self, key, value=''):
+        """
+        Add a tag to this object.  Tag's are stored by AWS and can be used
+        to organize and filter resources.  Adding a tag involves a round-trip
+        to the EC2 service.
+
+        :type key: str
+        :param key: The key or name of the tag being stored.
+
+        :type value: str
+        :param value: An optional value that can be stored with the tag.
+                      If you want only the tag name and no value, the
+                      value should be the empty string.
+        """
+        status = self.connection.create_tags([self.id], {key : value})
+        if self.tags is None:
+            self.tags = TagSet()
+        self.tags[key] = value
+
+    def remove_tag(self, key, value=None):
+        """
+        Remove a tag from this object.  Removing a tag involves a round-trip
+        to the EC2 service.
+
+        :type key: str
+        :param key: The key or name of the tag being stored.
+
+        :type value: str
+        :param value: An optional value that can be stored with the tag.
+                      If a value is provided, it must match the value
+                      currently stored in EC2.  If not, the tag will not
+                      be removed.  If a value of None is provided, all
+                      tags with the specified name will be deleted.
+                      NOTE: There is an important distinction between
+                      a value of '' and a value of None.
+        """
+        if value:
+            tags = {key : value}
+        else:
+            tags = [key]
+        status = self.connection.delete_tags([self.id], tags)
+        if key in self.tags:
+            del self.tags[key]