Commits on Sep 30, 2022

1. Add support for dynamic upstreams …

   Previously, NKG used the cluster IP of the Service to route traffic to the
   backend Services specified by HTTPRoutes. With this commit, NKG will use the
   endpoints of the Pods corresponding to a Service as the upstream servers for a
   backend Service.
   
   This change adds the following components:
   * EndpointSlice controller for caching and listing EndpointSlices.
   * Relationship.Capturer for tracking and reporting on relationships between
     Gateway API resources and non-Gateway API resources (e.g. Services).
   * ServiceResolver replaces the ServiceStore and resolves Service:Port to a list
   * of endpoints.
   
   This commit also adds upstreams to the nginx config generator. One upstream is
   generated for each unique and valid Service:Port BackendRef. If a BackendRef
   cannot be resolved, a 502 is returned.
   
   Known Limitations:
   * Traffic cannot be routed to Headless Services that do not have a defined port.
   * If a user manually creates and EndpointSlice, they will need to populate the
     "kubernetes.io/service-name" label and set the ready condition of the
      endpoints to true. Otherwise, NKG will fail to resolve the Service endpoints.

   

   kate-osborn committed Sep 30, 2022
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