feat(kumactl) pagination

[jakubdyszkiewicz]

Summary

Introducing pagination in kumactl.

Examples

Universal

❯❯❯ kumactl get dataplanes --size=1
MESH      NAME     TAGS
default   web-01   service=web

Rerun command with --offset=1 argument to retrieve more resources

❯❯❯ kumactl get dataplanes --size=1 --offset=1
MESH      NAME         TAGS
default   backend-01   env=production protocol=http service=backend version=2.0

Kubernetes

❯❯❯ kumactl get dataplanes --size=3
MESH      NAME                                              TAGS
default   kuma-demo-app-68758d8d5d-ptfgl.kuma-demo          app=kuma-demo-frontend env=prod pod-template-hash=68758d8d5d protocol=http service=frontend.kuma-demo.svc:8080 version=v8
default   kuma-demo-backend-v0-6fdb79ddfd-ms566.kuma-demo   app=kuma-demo-backend env=prod pod-template-hash=6fdb79ddfd protocol=http service=backend.kuma-demo.svc:3001 version=v0
default   postgres-master-78d9c9c8c9-fvdr2.kuma-demo        app=postgres pod-template-hash=78d9c9c8c9 protocol=tcp service=postgres.kuma-demo.svc:5432

Rerun command with --offset=eyJ2IjoibWV0YS5rOHMuaW8vdjEiLCJydiI6MTAwMzMsInN0YXJ0Ijoia3VtYS1kZW1vL3Bvc3RncmVzLW1hc3Rlci03OGQ5YzljOGM5LWZ2ZHIyXHUwMDAwIn0 argument to retrieve more resources

❯❯❯ kumactl get dataplanes --size=3 --offset=eyJ2IjoibWV0YS5rOHMuaW8vdjEiLCJydiI6MTAwMzMsInN0YXJ0Ijoia3VtYS1kZW1vL3Bvc3RncmVzLW1hc3Rlci03OGQ5YzljOGM5LWZ2ZHIyXHUwMDAwIn0
MESH      NAME                                      TAGS
default   redis-master-657c58c859-xzldf.kuma-demo   app=redis pod-template-hash=657c58c859 protocol=tcp role=master service=redis.kuma-demo.svc:6379 tier=backend

Sidenotes:
By default, the size is 1000 (defined in API Server)

I turned off Kubernetes cache in client

1. It didn't support chunking (pagination)
2. We maintain our cache for resources so we won't store "same" objects twice.