6:12 p.m.
----- Original Message -----
From: "Lukas Krejci" <lkrejci(a)redhat.com>
To: "Discussions around Hawkular development"
<hawkular-dev(a)lists.jboss.org>
Sent: Tuesday, April 28, 2015 2:58:47 PM
Subject: Re: [Hawkular-dev] Tenant Id - Not Part of URL
How do metrics' tenants fit into the hawkular accounts and its persona
concept?
This change will get Hawkular Metrics in a position to answer that hard question later; no
decision needs to be made before the actual integration. Hawkular Metrics will never drop
the idea of a tenant internally. It is essential to the way metrics are partitioned and
uniquely identified. However, the mapping between external services and internal tenant
ids should not leak in the URL of a resource. That kind of leak would be limiting the
design choices for integration. This is a general answer, not just for the Hawkular
Accounts integration.
Now, specifically to your question, I see personas to be mapped directly to tenant ids.
Hawkular Metrics does not need a very complex authorization model. Anybody with the right
credentials for a tenant id gets access to all the metrics for that tenant id. When the
integration with Hawkular Accounts happens, Metrics would just need to write code to
delegate the authentication to Hawkular Accounts, obtain the personas details, and then
map personas to internal tenant ids. And this is done without affecting URLs (completely
outside of resource addressing).
Thank you,
Stefan
----- Original Message -----
> From: "Stefan Negrea" <snegrea(a)redhat.com>
> To: "Discussions" <hawkular-dev(a)lists.jboss.org>
> Sent: Tuesday, 28 April, 2015 5:44:56 PM
> Subject: [Hawkular-dev] Tenant Id - Not Part of URL
>
> Hello Everybody,
>
> I've been working on a PR for the upcoming Hawkular Metrics release that
> will
> remove the tenant id from the end-point URLs. The tenant id will be moved
> to
> either a header parameter or a query parameter. The query parameter is in
> place for cases (such as curl) where setting a header is not possible,
> difficult, or inconvenient.
>
> Here is an example of the change:
>
> Existing URL:
> /{tenantId}/gauge/{metricId}/data
>
> New URL:
> /gauge/{metricId}/data
>
> Tenant id set via:
> 1) header - tenantId
> 2) query parameter - tenantId
>
>
> There are two exceptions to this rule, /tenants and /db/{tenantid}/series.
> The /tenants end-point will be changed into something different in the
> upcoming releases since it is mostly a management type API that does not
> belong in the same place with the regular metrics endpoint. And
> /db/{tenantid}/series end-point is needed in this exact format for
> compatibility with Influxdb compatible services.
>
>
> Now, to the merits of this change. The tenant id is volatile, can change
> any
> time, and changes to it should be expected; but the rest of the URL is
> fixed. The second issue is that the tenant id is a security concern. So we
> were limited in design choices since a security concern was leaking as part
> of the URL.
>
> So removing the tenant id from the URL will give us permanent & consistent
> addresses for resources (metrics and metric data points). And we will gain
> a
> lot of flexibility on the security side. In the future, users could
> authenticate with a user/pass combo and the backend would transform that
> into a tenant id to be used on the request. If the same user later decides
> to use a tenant id to pass along the request, the URL of the resources
> would
> not change. Another expectation is that tenant id is not sufficient, it is
> typically a combo of id + secret; so we would have resorted to a header or
> query param for the second piece of information (the secret).
>
> This change will give us the flexibility to adjust the security model (the
> meaning of tenant ids and ways to validate them) without compromising the
> URL structure. This will help Hawkular Metrics as it gets integrated into
> more and more projects and products.
>
> Here are the links to the JIRA and the PR for this change:
> https://github.com/hawkular/hawkular-metrics/pull/202
> https://issues.jboss.org/browse/HWKMETRICS-68
>
>
>
> Thank you,
> Stefan Negrea
>
> Software Engineer
>
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