Action policy

The Action policy, is an optional policy, which can be provided to a single Action in Capact. This policy can be used:

• in case the User wants to enforce a specific Implementation for an Interface,
• when the User wants to provide additional parameters to an Implementation.

Example

The following YAML snippet presents an Action policy example with additional comments:

rules: # Configures the following behavior for Engine during rendering Action
  - interface: # Rules for Interface with exact path
      path: cap.interface.productivity.rocketchat.install
    oneOf:
      - implementationConstraints: # Enforces the Helm Rocket.Chat Implementation
          path: "cap.implementation.rocketchat.helm.install"
        inject:
          additionalParameters: # Injects additional parameters for the Implementation
            - name: additional-parameters # Name must match one of the parameter defined under `additionalInput.parameters` in the Implementation
              value:
                replicaCount: 3
          additionalTypeInstances: # Injects additional TypeInstances for the Implementation
            - name: sample # Name must match one of the parameter defined under `additionalInput.typeInstances` in the Implementation
              id: 0b6dba9a-d111-419d-b236-357cf0e8603a

  - interface: # Configures a second rule in the Action policy
      path: cap.interface.database.mongodb.install
    oneOf:
      - implementationConstraints:
          path: "cap.implementation.bitnami.mongodb.install"
        inject:
          additionalParameters: # Injects additional parameters for the Implementation
            - name: additional-parameters # Name must match one of the parameter defined under `additionalInput.parameters` in the Implementation
              value:
                image:
                  registry: docker.io
                  pullPolicy: Always

Provide Action policy, when creating Action using Capact CLI

To provide the Action policy, when creating an Action you can use the --action-policy-from-file flag to the Capact CLI. First, create a YAML file with the desired Action policy, for example:

rules:
  - interface:
      path: cap.interface.productivity.rocketchat.install
    oneOf:
      - implementationConstraints:
          path: "cap.implementation.rocketchat.install"
        inject:
          additionalParameters: # Injects additional parameters for the Implementation
            - name: additional-parameters # Name must match one of the parameter defined under `additionalInput.parameters` in the Implementation
              value:
                replicaCount: 3

To know how to define the policy rules, see the Policy syntax section. Then, provide the path to the created policy YAML file using the --action-policy-from-file flag, when creating the Action:

capact action create \
  cap.interface.productivity.rocketchat.install \
  --action-policy-from-file {path-to-policy-file}