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wadm Open Application Model

The wasmCloud Application Deployment Manager uses the Open Application Model to define application specifications. Because this specification is extensible and platform agnostic, it makes for an ideal way to represent applications with metadata specific to wasmCloud.

wasmCloud OAM Components

The following is a list of the components wasmCloud has added to the model.

  • component - A WebAssembly component
  • provider - A capability provider

wasmCloud OAM Traits

The following is a list of the traits wasmCloud has added via customization to its application model.

  • spreadscaler - Defines the spread of instances of a particular entity across multiple hosts with affinity requirements
  • link - A link definition that describes a link between a component and a capability provider or a component and another component

JSON Schema

A JSON schema is automatically generated from our Rust structures and is at the root of the repository: oam.schema.json.

Example Application YAML

The following is an example YAML file describing an application

apiVersion: core.oam.dev/v1beta1
kind: Application
metadata:
  name: my-example-app
  annotations:
    description: 'This is my app revision 2'
spec:
  components:
    - name: userinfo
      type: component
      properties:
        image: wasmcloud.azurecr.io/fake:1
      traits:
        - type: spreadscaler
          properties:
            instances: 4
            spread:
              - name: eastcoast
                requirements:
                  zone: us-east-1
                weight: 80
              - name: westcoast
                requirements:
                  zone: us-west-1
                weight: 20

    - name: webcap
      type: capability
      properties:
        image: wasmcloud.azurecr.io/httpserver:0.13.1
      traits:
        - type: link
          properties:
            target:
              name: userinfo
              config: []
            namespace: wasi
            package: http
            interfaces:
              - incoming-handler
            source:
              config: []

    - name: ledblinky
      type: capability
      properties:
        image: wasmcloud.azurecr.io/ledblinky:0.0.1
      traits:
        - type: spreadscaler
          properties:
            instances: 1
            spread:
              - name: haslights
                requirements:
                  ledenabled: 'true'
                  # default weight is 100