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docs: support in-process evaluation (#640)
Signed-off-by: odubajDT <ondrej.dubaj@dynatrace.com> Signed-off-by: odubajDT <93584209+odubajDT@users.noreply.github.com> Co-authored-by: Florian Bacher <florian.bacher@dynatrace.com> Co-authored-by: Todd Baert <todd.baert@dynatrace.com>
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| # Feature Flag In-process Configuration | ||
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| The `InProcessConfiguration` is a custom resource used to set up the | ||
| [configuration options](https://flagd.dev/providers/nodejs/?h=flagd_host#available-configuration-options) | ||
| for applications using `OpenFeature operator` with in-process evaluation mode enabled. | ||
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| Below you can see a minimal example of `InProcessConfiguration` resource | ||
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| ```yaml | ||
| apiVersion: core.openfeature.dev/v1beta1 | ||
| kind: InProcessConfiguration | ||
| metadata: | ||
| labels: | ||
| name: inprocessconfiguration-sample | ||
| spec: | ||
| port: 2424 | ||
| tls: true | ||
| offlineFlagSourcePath: "my-path" | ||
| cacheMaxSize: 11 | ||
| envVarPrefix: "my-prefix" | ||
| envVars: | ||
| - name: "name1" | ||
| value: "val1" | ||
| - name: "name2" | ||
| value: "val2" | ||
| ``` | ||
| ## How does it work? | ||
| Similar to usage of [FeatureFlagSource](./feature_flag_source.md) configuration, | ||
| [annotations](./annotations.md#) are used to allow the injection of configuration data | ||
| into the annotated Pod. | ||
| The mutating webhook parses the annotations, retrieves the referenced `InProcessConfiguration` resources from the cluster and injects the data from the resource into all containers of the Pod via environment variables, which configure the provider in the workload to consume feature flag configuration from the available [sync implementation](https://flagd.dev/concepts/syncs/#grpc-sync) specified by the configuration. | ||
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| ## Merging of configurations | ||
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| The value of `openfeature.dev/inprocessconfiguration` annotation is a comma separated list of values following one of two patterns: {NAME} or {NAMESPACE}/{NAME}. | ||
| If no namespace is provided, it is assumed that the CR is within the same namespace as the deployed pod, for example: | ||
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| ```yaml | ||
| metadata: | ||
| annotations: | ||
| openfeature.dev/enabled: "true" | ||
| openfeature.dev/inprocessconfiguration: "inProcessConfig-A, inProcessConfig-B" | ||
| ``` | ||
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| When multiple `InProcessConfigurations` are provided, the custom resources are merged in runtime and the last `CR` takes precedence over the first, similarly how it's done for `FeatureFlagSource`. | ||
| In this example, 2 CRs are being used to set the injected configuration. | ||
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| ```yaml | ||
| apiVersion: core.openfeature.dev/v1beta1 | ||
| kind: InProcessConfiguration | ||
| metadata: | ||
| name: inProcessConfig-A | ||
| spec: | ||
| port: 2424 | ||
| tls: true | ||
| offlineFlagSourcePath: "my-path" | ||
| cacheMaxSize: 11 | ||
| envVarPrefix: "my-prefix" | ||
| envVars: | ||
| - name: "name1" | ||
| value: "val1" | ||
| - name: "name2" | ||
| value: "val2" | ||
| --- | ||
| apiVersion: core.openfeature.dev/v1beta1 | ||
| kind: InProcessConfiguration | ||
| metadata: | ||
| name: inProcessConfig-B | ||
| spec: | ||
| envVarPrefix: "my-second-prefix" | ||
| host: "my-host" | ||
| ``` | ||
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| The resources are merged in runtime, which means that no changes are made to the `InProcessConfiguration` resources | ||
| in the cluster, but the operator handles the merge and injection internally. | ||
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| The resulting configuration will look like the following | ||
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| ```yaml | ||
| apiVersion: core.openfeature.dev/v1beta1 | ||
| kind: InProcessConfiguration | ||
| metadata: | ||
| name: internal | ||
| spec: | ||
| port: 2424 | ||
| tls: true | ||
| offlineFlagSourcePath: "my-path" | ||
| cacheMaxSize: 11 | ||
| envVarPrefix: "my-seconf-prefix" | ||
| host: "my-host" | ||
| envVars: | ||
| - name: "name1" | ||
| value: "val1" | ||
| - name: "name2" | ||
| value: "val2" | ||
| ``` | ||
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| This resulting resource is transformed into environment variables and injected into all containers | ||
| of the annotated Pod | ||
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| ```yaml | ||
| apiVersion: v1 | ||
| kind: Pod | ||
| metadata: | ||
| annotations: | ||
| openfeature.dev/enabled: "true" | ||
| openfeature.dev/inprocessconfiguration: "inProcessConfig-A, inProcessConfig-B" | ||
| name: ofo-pod | ||
| spec: | ||
| containers: | ||
| - name: container1 | ||
| image: image1 | ||
| env: | ||
| - name: my-second-prefix_name2 | ||
| value: val2 | ||
| - name: my-second-prefix_name1 | ||
| value: val1 | ||
| - name: my-second-prefix_HOST | ||
| value: my-host | ||
| - name: my-second-prefix_PORT | ||
| value: "2424" | ||
| - name: my-second-prefix_TLS | ||
| value: "true" | ||
| - name: my-second-prefix_OFFLINE_FLAG_SOURCE_PATH | ||
| value: my-path | ||
| - name: my-second-prefix_MAX_CACHE_SIZE | ||
| value: "11" | ||
| - name: my-second-prefix_RESOLVER | ||
| value: in-process | ||
| - name: container2 | ||
| image: image2 | ||
| env: | ||
| - name: my-second-prefix_name2 | ||
| value: val2 | ||
| - name: my-second-prefix_name1 | ||
| value: val1 | ||
| - name: my-second-prefix_HOST | ||
| value: my-host | ||
| - name: my-second-prefix_PORT | ||
| value: "2424" | ||
| - name: my-second-prefix_TLS | ||
| value: "true" | ||
| - name: my-second-prefix_OFFLINE_FLAG_SOURCE_PATH | ||
| value: my-path | ||
| - name: my-second-prefix_MAX_CACHE_SIZE | ||
| value: "11" | ||
| - name: my-second-prefix_RESOLVER | ||
| value: in-process | ||
| ``` |
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