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Implement /deployments API endpoint

  1. Adapt client-side caching mechanism to reduce API server calls to api-server Kubernetes cluster component.
  2. Add /deployments API endpoint to FastHTTP server
  3. Return JSON array of deployment names from the informer's local cache.

Informer's local cache

  • cache

    Package cache is a client-side caching mechanism. It is useful for reducing the number of server calls you'd otherwise need to make. Reflector watches a server and updates a Store. Two stores are provided; one that simply caches objects (for example, to allow a scheduler to list currently available nodes), and one that additionally acts as a FIFO queue (for example, to allow a scheduler to process incoming pods).

  • GetStore returns the informer's local cache as a Store

    E.g.:

    deploymentInformer.GetStore().List()

Usage:

  1. To compile controller, run:
make build
  1. To start server, run
./k8s-controller --log-level trace --kubeconfig ~/.kube/config server --namespace <namespace> --labelSelectors labelName=labelValue
  1. Call /deployments API endpoint to list deployment names for specified namespace and labelSelectors in step 2.
curl http://localhost:<port>/deployments