On 07/18/2018 03:57 PM, Martin Perina wrote:
Ondro/Ravi/Tal, could you please reply to below questions?
On Tue, Jul 17, 2018 at 3:59 PM, Suchitra Herwadkar <Suchitra.Herwadkar@veritas.com <mailto:Suchitra.Herwadkar@veritas.com>> wrote:
Hello oVirt Development team____
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We had some more questions as we continue working on REST APIs. Kindly help us answer the same. ____
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What is the expiry of generated access_token? ____
*Description: *We have observed that the output of *“/ovirt-engine/sso/oauth/token” *contains a field *“exp”* which points to the date when the access_token is going to expire. In our case, we have seen this value to be 8 days later. However, the access_token gets expired within an hour. We would like to understand exactly what is the lifetime of this access_token? What we are seeing is something unexpected? Is this value configurable by users?
I know you can increase user session timeout in engine-config property called 'UserSessionTimeOutInterval', by default it's one hour (note you must restart ovirt-engine in order to take effect of the change). How the field 'exp' is related, I don't exactly know. Ravi?
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How to retrieve the ‘creation_status’ of the snapshot through REST API? ____
*Description: *We see there is a way to get it as part of query snapshot API viz /ovirt-engine/api/vms/<vm_id>/snapshots/<snapshot_id> where the response contains detailed information of snapshot, along with the field *"snapshot_status": "ok". *Just wanted to check if there is another API explicitly devoted to getting the creation status so that we can poll it periodically to know the status?____
At least in CURL, we see there is some URL to fetch the creation status like this /ovirt-engine/api/<vm_id>/snapshots/<snapshot_id> /creation_status/<WHAT_IS_THIS_ID?>"____
The link to creation_status is provided in the response of create snapshot operation, if you do it asynchronously. But it's not recomended to use it that way. As you've described polling the 'snapshot_status' attribute is the best way of waiting for operation to finish.
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*Q.* How to call a DELETE snapshot API with ‘async’ operation as ‘false’? ____
*Description: *The documentation for DELETE snapshot API mentions that the DELETE operation can be invoked synchronously or asynchronously based on the value of the parameter ‘async’. I wanted to perform DELETE operation synchronously, so tried providing this parameter in the body as “<async>false<async>”, still it was doing the operation asynchronously. Please advise on the correct usage of it.
Same as above the sync/async is incorrect here. Both operations behave the same, but async will return the 'creation_status' which you can poll to get the result, but every operation is implemented differently so I wouldn't recomend to use it. If you want to be sure the snapshost is deleted I the best way is the run DELETE /api/vms/123/snapshots/456, and then do polling of /api/vms /123/snapshots/456 until it returns 404. This operation unfortunatelly can't be invoked synchronously.
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Thanks____
Suchitra ____
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*From: *Ranjit DSouza <Ranjit.DSouza@veritas.com <mailto:Ranjit.DSouza@veritas.com>> *Date: *Tuesday, July 3, 2018 at 1:43 PM *To: *"devel@ovirt.org <mailto:devel@ovirt.org>" <devel@ovirt.org <mailto:devel@ovirt.org>> *Cc: *DL-VTAS-ENG-NBU-EverestFalcons <DL-VTAS-ENG-NBU-EverestFalcons@veritas.com <mailto:DL-VTAS-ENG-NBU-EverestFalcons@veritas.com>>, Sudhakar Paulzagade <Sudhakar.Paulzagade@veritas.com <mailto:Sudhakar.Paulzagade@veritas.com>>, Pavan Chavva <pchavva@redhat.com <mailto:pchavva@redhat.com>>, Navin Tah <Navin.Tah@veritas.com <mailto:Navin.Tah@veritas.com>> *Subject: *Image Transfer mechanism queries/API support____
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Hello oVirt Development team____
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We had a conversation with Pavan Chavva for supporting RHV. He had suggested to contact you with queries related to oVirt APIs we plan to use.____
We have following queries:____
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__1.__While downloading a snapshot disk, can we identify allocated extents and download only those using oVirt API? We are able to download the disk using the Image Transfer API mechanism. ____
However, this method downloads the entire disk including the non-allocated extents, which is a performance overhead. If this functionality does not exist at this point will it be available in near future?____
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__2.__Is there an alternate method to transfer a snapshot to and from RHV storage? Are there other methods such as NFS share where we can download snapshot image to and from RHV storage?____
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Thanks____
Ranjit____
Team EverestFalcons____
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-- Martin Perina Associate Manager, Software Engineering Red Hat Czech s.r.o.