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Co-authored-by: Jean du Plessis <jean@upbound.io>
Signed-off-by: Predrag Knezevic <predrag.knezevic@upbound.io>
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Predrag Knezevic 2023-06-13 11:51:02 +02:00 committed by Predrag Knezevic
parent 26f8ec3008
commit 9a13870834
1 changed files with 9 additions and 8 deletions
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content/knowledge-base/guides/composition-functions.md
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@ -244,7 +244,7 @@ follows Kubernetes conventions.
A `FunctionIO` consists of: A `FunctionIO` consists of:
* An optional, arbitrary `config` object. * An optional, arbitrary `config` object.
* The `observed` state of the XR and any existing composed resources and their connection details. * The `observed` state of the XR, any existing composed resources, and their connection details.
* The `desired` state of the XR and any composed resources. * The `desired` state of the XR and any composed resources.
* Optional `results` of the Function pipeline. * Optional `results` of the Function pipeline.
@ -322,13 +322,14 @@ The `observed` state of the XR and any existing composed resources reflects the
observed state at the beginning of a reconcile, before any Composition happens. observed state at the beginning of a reconcile, before any Composition happens.
Your Function will only see composite and composed resources that _actually Your Function will only see composite and composed resources that _actually
exist_ in the API server in the `observed` state. The `observed` state also exist_ in the API server in the `observed` state. The `observed` state also
includes any observed connection details. A few early function invocations includes any observed connection details. Initial function invocations
might be seeing empty connection details, but as soon external resources are created, might see empty connection details, but once external resources are created,
connection details are going to be passed to the functions. Access to the connection connection details will be passed to the functions. Access to the connection
details enables us to implement quite a sophisticated tweaks on composed resources. details enables us to implement quite sophisticated tweaks on composed resources.
For example, if a composition is declared on two or more resources, it would be possible
to use the connection details of one resource to update another resource properly. For example, if a composition is declared on two or more resources, it is possible
None of the available patch types can achieve that. to use one resource's connection details to update another. This ability is not available
with any of the available patch types available.
The `desired` state of the XR and composed resources is how your Function tells The `desired` state of the XR and composed resources is how your Function tells
Crossplane what it should do. Crossplane 'bootstraps' the initial desired state Crossplane what it should do. Crossplane 'bootstraps' the initial desired state