first & last sample timestamps not included in the Resource representation

[Eoghan Glynn]

The first & last sample timestamps for any meter associated with a resource are calculated when we retrieve the Resource models from the storage driver, via logic added in this commit:

  https://github.com/openstack/ceilometer/commit/92bed7c1

However due to a mismatch between the Resource model and the Resource representation returned by the API, these fist & last timestamps are simply discarded ... i.e. are not returned from the GET /v2/resources API call.

Since it doesn't make sense to incur the cost of calculating these timestamps without exposing them, seems we need a change such as the following to line up the two Resource classes:

diff --git a/ceilometer/api/controllers/v2.py b/ceilometer/api/controllers/v2.py
index 0e03ea5..5dba9d4 100644
--- a/ceilometer/api/controllers/v2.py
+++ b/ceilometer/api/controllers/v2.py
@@ -982,8 +982,11 @@ class Resource(_Base):
     user_id = wtypes.text
     "The ID of the user who created the resource or updated it last"

- timestamp = datetime.datetime
- "UTC date and time of the last update to any meter for the resource"
+ first_sample_timestamp = datetime.datetime
+ "UTC date & time of the first sample for any meter associated with the resource"
+
+ last_sample_timestamp = datetime.datetime
+ "UTC date & time of the last sample for any meter associated with the resource"

     metadata = {wtypes.text: wtypes.text}
     "Arbitrary metadata associated with the resource"

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/65118

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/65118
Committed: https://git.openstack.org/cgit/openstack/ceilometer/commit/?id=6a9dc97f962c288f5037d59d05a771823eb4bcdd
Submitter: Jenkins
Branch: master

commit 6a9dc97f962c288f5037d59d05a771823eb4bcdd
Author: Eoghan Glynn <email address hidden>
Date: Mon Jan 6 17:25:43 2014 +0000

    1st & last sample timestamps in Resource representation

    Fixes bug 1262335

    Previously, the first and last sample timestamps associated
    with a resource were calculated by the storage driver, but
    then discarded.

    Now, we include these values in the API resource representation.

    Change-Id: I3cf6081e1ac1294083f6326f85dabebab0d02203

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/havana
Review: https://review.openstack.org/65445

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/65445
Committed: https://git.openstack.org/cgit/openstack/ceilometer/commit/?id=3089be82318fef1a865bea411a1579b590d1e2b1
Submitter: Jenkins
Branch: stable/havana

commit 3089be82318fef1a865bea411a1579b590d1e2b1
Author: Eoghan Glynn <email address hidden>
Date: Mon Jan 6 17:25:43 2014 +0000

    1st & last sample timestamps in Resource representation

    Fixes bug 1262335

    Previously, the first and last sample timestamps associated
    with a resource were calculated by the storage driver, but
    then discarded.

    Now, we include these values in the API resource representation.

    Change-Id: I3cf6081e1ac1294083f6326f85dabebab0d02203
    (cherry picked from commit 6a9dc97f962c288f5037d59d05a771823eb4bcdd)