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On 14-07-15 11:43 AM, Richard Harding wrote:
> On Tue, 15 Jul 2014, Aaron Bentley wrote:
> 
>> On 14-07-15 10:17 AM, roger peppe wrote:
>>> The most significant change is that all endpoints refer just
>>> to a single charm or bundle, rather than being "bulk" calls as 
>>> they were before.
>> 
>> That sounds like the opposite of what juju-reports wants.  Does 
>> it really mean that we would need to make N requests to retrieve 
>> info on N charms?  What was the reason for changing this?
> 
> The change is because we went through the known clients and could 
> not come up with use cases where some client had a known list of 
> charm ids they wanted data for, but they knew those ids ahead of 
> time.

I am surprised that juju-reports was not considered a known client.  I
certainly made many comments on the first draft of the original proposal.

> Aaron, I'd like to see if we can get your full use case details
> and make sure we address them.

Our use case is we want to be able to synchronize public data from the
charm store into our DB.

We need to provide the statistics that show adoption rates to Mark
Ramm and Mark Shuttleworth.  We cannot forsee exactly which questions
will be asked.  We need to be able to add new statistics without
friction, so we need our own copy of this data.

One way to do this would be to have an API that accepts a timestamp
and returns the metadata for all charm and bundle revisions created on
or after that timestamp.

Right now we do this instead:
1. Retrieve a list of all charms from charmworld
2. Determine the tip revisions of all charms from the charm store
3. Determine which revisions exist but we haven't seen (including
non-tip revisions)
4. Determine the revision ids of all the new revisions
5. Use the revision-ids to determine the publication dates of all the
new revisions

Steps 2, 4, 5 use multiple-id queries.

Right now, we're showing number of charms published here:
http://reports.vapour.ws/scorecard

We'll need to do the same for bundles.

We've also been asked to display the number of running environments.

> You had requested an all charms/bundles api call in the last 
> revision of the doc and we're looking at addresssing that through 
> search results.

The doc doesn't say that search can be used to list all charms and
bundles.  If you meant it to be used that way, please say so in the
doc ;-)

Search provides results for only the most recent revisions.  It can
stand in for step 1 & 2 of our algorithm, but in order to implement 4
and 5 efficiently, we'd need to do multi-id queries.

Aaron
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