Initial support for per-instance metadata, though the OpenStack API. Key/value pairs can be specified at instance creation time and are returned in the details view. Support limits based on quota system.

3 files changed, 97 insertions, 1 deletions

diff --git a/nova/db/sqlalchemy/api.py b/nova/db/sqlalchemy/api.py
index 2ab402e1c..be29fe2a0 100644
--- a/nova/db/sqlalchemy/api.py
+++ b/nova/db/sqlalchemy/api.py
@@ -715,6 +715,7 @@ def instance_get(context, instance_id, session=None):
                          options(joinedload_all('security_groups.rules')).\
                          options(joinedload('volumes')).\
                          options(joinedload_all('fixed_ip.network')).\
+                         options(joinedload('metadata')).\
                          filter_by(id=instance_id).\
                          filter_by(deleted=can_read_deleted(context)).\
                          first()
@@ -723,6 +724,7 @@ def instance_get(context, instance_id, session=None):
                          options(joinedload_all('fixed_ip.floating_ips')).\
                          options(joinedload_all('security_groups.rules')).\
                          options(joinedload('volumes')).\
+                         options(joinedload('metadata')).\
                          filter_by(project_id=context.project_id).\
                          filter_by(id=instance_id).\
                          filter_by(deleted=False).\
diff --git a/nova/db/sqlalchemy/migrate_repo/versions/005_add_instance_metadata.py b/nova/db/sqlalchemy/migrate_repo/versions/005_add_instance_metadata.py
new file mode 100644
index 000000000..4cb07e0d8
--- /dev/null
+++ b/nova/db/sqlalchemy/migrate_repo/versions/005_add_instance_metadata.py
@@ -0,0 +1,78 @@
+# vim: tabstop=4 shiftwidth=4 softtabstop=4
+
+# Copyright 2011 Justin Santa Barbara
+# All Rights Reserved.
+#
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
+from sqlalchemy import *
+from migrate import *
+
+from nova import log as logging
+
+
+meta = MetaData()
+
+
+# Just for the ForeignKey and column creation to succeed, these are not the
+# actual definitions of instances or services.
+instances = Table('instances', meta,
+        Column('id', Integer(), primary_key=True, nullable=False),
+        )
+
+quotas = Table('quotas', meta,
+        Column('id', Integer(),  primary_key=True, nullable=False),
+        )
+
+
+#
+# New Tables
+#
+
+instance_metadata_table = Table('instance_metadata', meta,
+        Column('created_at', DateTime(timezone=False)),
+        Column('updated_at', DateTime(timezone=False)),
+        Column('deleted_at', DateTime(timezone=False)),
+        Column('deleted', Boolean(create_constraint=True, name=None)),
+        Column('id', Integer(), primary_key=True, nullable=False),
+        Column('instance_id',
+               Integer(),
+               ForeignKey('instances.id'),
+               nullable=False),
+        Column('key',
+               String(length=255, convert_unicode=False, assert_unicode=None,
+                      unicode_error=None, _warn_on_bytestring=False)),
+        Column('value',
+               String(length=255, convert_unicode=False, assert_unicode=None,
+                      unicode_error=None, _warn_on_bytestring=False)))
+
+
+#
+# New columns
+#
+quota_metadata_items = Column('metadata_items', Integer())
+
+
+def upgrade(migrate_engine):
+    # Upgrade operations go here. Don't create your own engine;
+    # bind migrate_engine to your metadata
+    meta.bind = migrate_engine
+    for table in (instance_metadata_table, ):
+        try:
+            table.create()
+        except Exception:
+            logging.info(repr(table))
+            logging.exception('Exception while creating table')
+            raise
+
+    quotas.create_column(quota_metadata_items)
diff --git a/nova/db/sqlalchemy/models.py b/nova/db/sqlalchemy/models.py
index 40a96fc17..a842e4cc4 100644
--- a/nova/db/sqlalchemy/models.py
+++ b/nova/db/sqlalchemy/models.py
@@ -256,6 +256,7 @@ class Quota(BASE, NovaBase):
     volumes = Column(Integer)
     gigabytes = Column(Integer)
     floating_ips = Column(Integer)
+    metadata_items = Column(Integer)
 
 
 class ExportDevice(BASE, NovaBase):
@@ -536,6 +537,20 @@ class Console(BASE, NovaBase):
     pool = relationship(ConsolePool, backref=backref('consoles'))
 
 
+class InstanceMetadata(BASE, NovaBase):
+    """Represents a metadata key/value pair for an instance"""
+    __tablename__ = 'instance_metadata'
+    id = Column(Integer, primary_key=True)
+    key = Column(String(255))
+    value = Column(String(255))
+    instance_id = Column(Integer, ForeignKey('instances.id'), nullable=False)
+    instance = relationship(Instance, backref="metadata",
+                            foreign_keys=instance_id,
+                            primaryjoin='and_('
+                                'InstanceMetadata.instance_id == Instance.id,'
+                                'InstanceMetadata.deleted == False)')
+
+
 class Zone(BASE, NovaBase):
     """Represents a child zone of this zone."""
     __tablename__ = 'zones'
@@ -557,7 +572,8 @@ def register_models():
               Volume, ExportDevice, IscsiTarget, FixedIp, FloatingIp,
               Network, SecurityGroup, SecurityGroupIngressRule,
               SecurityGroupInstanceAssociation, AuthToken, User,
-              Project, Certificate, ConsolePool, Console, Zone)
+              Project, Certificate, ConsolePool, Console, Zone,
+              InstanceMetadata)
     engine = create_engine(FLAGS.sql_connection, echo=False)
     for model in models:
         model.metadata.create_all(engine)