christophd commented on PR #4100:
URL: https://github.com/apache/camel-k/pull/4100#issuecomment-1462125460
Added the implementation of the data types support in KameletBindings.
The idea is to allow the user to specify the data types for output/input on
Kamelet references in a binding (see source and sink Kamelets in example below).
```yaml
apiVersion: camel.apache.org/v1alpha1
kind: KameletBinding
metadata:
name: event-binding
spec:
source:
ref:
kind: Kamelet
apiVersion: camel.apache.org/v1alpha1
name: event-source
dataTypes:
out:
format: cloudevents
sink:
ref:
kind: Kamelet
apiVersion: camel.apache.org/v1alpha1
name: event-sink
dataTypes:
in:
format: binary
```
Once the user explicitly defines the data types in the binding Camel K
automatically adds respective steps (using the data-type-action Kamelet) in
order to apply the data types for input/output (see generated
`template-flow.yaml` below).
```yaml
from:
uri: kamelet:event-source/source
steps:
- kamelet:
name: data-type-action/source-out
- kamelet:
name: data-type-action/sink-in
- to: kamelet:event-sink/sink
```
This is for data types being set on source and sink Kamelet references in a
binding. Also, the user is able to add data types to Kamelet reference used in
the steps section of a binding:
```yaml
apiVersion: camel.apache.org/v1alpha1
kind: KameletBinding
metadata:
name: event-binding
spec:
source:
ref:
kind: Kamelet
apiVersion: camel.apache.org/v1alpha1
name: event-source
steps:
- ref:
kind: Kamelet
apiVersion: camel.apache.org/v1alpha1
name: log-action
dataTypes:
out:
format: binary
sink:
ref:
kind: Kamelet
apiVersion: camel.apache.org/v1alpha1
name: event-sink
```
This time the generated `template-flow.yaml` looks like this:
```yaml
from:
uri: kamelet:event-source/source
steps:
- pipeline:
id: action-0-pipeline
steps:
- kamelet:
name: log-action/action-0
- kamelet:
name: data-type-action/action-0-out
- to: kamelet:event-sink/sink
```
Camel K uses a pipeline step in order to apply the data type action as an
output of the log-action step.
The automatically added data type-action Kamelet steps will apply the given
data format using the format name and an optional component scheme. At the
moment the data type conversion logic is loaded from the camel-kamelet-utils
library that holds some default data type implementations for AWS-S3, AWS-DDB
and common String and binary data types (see
https://github.com/apache/camel-kamelets/tree/main/library/camel-kamelets-utils/src/main/java/org/apache/camel/kamelets/utils/format/converter).
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