Convert EC2 API to use nova objects

Convert EC2 API to use nova objects

https://blueprints.launchpad.net/nova/+spec/ec2-api-objects

This blueprint covers updating EC2 API and related functions to use the Nova object model for all database interaction, like implementation in compute manager & nova-network now.

Problem description

Currently EC2 API use original raw db APIs to fetch data from the database.

Proposed change

The files need to be modified include:

  • nova/api/ec2/cloud.py

  • nova/api/ec2/ec2utils.py

  • nova/tests/api/ec2/test_cinder_cloud.py

  • nova/tests/api/ec2/test_cloud.py

  • nova/tests/api/ec2/test_ec2_validate.py

Alternatives

None

Data model impact

Four parts are included, EC2SnapshotIdMapping, EC2VolumeIdMapping, EC2S3Image, EC2InstanceIdMapping.

All of them need to be modified to make use of the object instead of using the db API directly for managing UUID to EC2 ID.

  • Now ‘EC2VolumeMapping’ & ‘EC2InstanceMapping’ need to co-ordinate work with russellb working on objects.

  • ‘EC2SnapshotIdMapping’ & ‘EC2S3Image’ object need to be added and implemented in nova/objects.ec2.py later.

REST API impact

None

Security impact

None

Notifications impact

None

Other end user impact

None

Performance Impact

None

Other deployer impact

None

Developer impact

None

Implementation

Assignee(s)

Primary assignee:

wingwj

Other contributors:

russellb

Work Items

  • Add ‘EC2VolumeMapping’ object - (needs to co-ordinate work with russellb)

  • Add ‘EC2InstanceMapping’ object - (needs to co-ordinate work with russellb)

  • Add ‘EC2SnapshotIdMapping’ & ‘EC2S3Image’ object in /nova/objects/ec2.py

  • Use ‘EC2VolumeMapping’ in EC2 API & related tests

  • Use ‘EC2InstanceMapping’ in EC2 API & related tests

  • Use ‘EC2SnapshotIdMapping’ in EC2 API & related tests

  • Use ‘EC2S3Image’ in EC2 API & related tests

Dependencies

None

Testing

The original unit tests also need to rewrite using nova objects. After the modifications, all changed APIs will be verified together.

Documentation Impact

None

References

None

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