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Multi Region Support - Orchestrator factories

Alejo Carballude requested to merge feature/multi_region_support_orchestrator_component_factory into feature/multi_region_support_multiple_platforms

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This MR restructures the orchestrator package to contain a components subpackage, which in turn contains a component package for each cluster component (e.g. Nodes, Pods, Services, etc.). Factories have been created for the orchestrator.Cluster interface, as well as for the interface exported by every cluster component.

The orchestrator.Cluster factory composes all component factories to allow creating clusters by nesting configs.

Cluster Factory
    Nodes Factory
    Pods Factory
    Services Factory
    Ingresses Factory
    IngressRules Factory
    NetworkPolicies Factory

This allows specifying a config like the following to create a cluster

# orchestrator.Cluster factory config
type: "kubernetes"
config:
  api: 
    kubeconfig: "" # Use default kubeconfig ~/.kube/config
  components:
    # nodes.Nodes factory config 
    nodes: 
      type: "kubernetes"
    # pods.Pods factory config 
    pods: 
      type: "kubernetes"
    # services.Services factory config 
    services: 
      type: "kubernetes"
    # ingresses.Ingresses factory config 
    ingresses: 
      type: "gloo"
    # ingresses.ingressRules factory config 
    ingressRules: 
      type: "gloo"
    # network.Policies factory config 
    networkPolicies: 
      type: "kubernetes"

Other information

The main downside to the Factory approach is the considerable amount of boilerplate code needed to setup factories. Future work should address the amount of repeated code introduced in this MR.

Additional documentation

Edited by Alejo Carballude

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