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ws.echo

Listens on ws port 7114 and will echo back whatever is sent to the server. Listens on wss port 7143 and will echo back whatever is sent to the server.

Requirements

  • bash, jq, nc
  • Kubernetes (e.g. Docker Desktop with Kubernetes enabled)
  • kubectl
  • helm 3.0+
  • wscat

Setup

The setup.sh script:

  • installs Zilla to the Kubernetes cluster with helm and waits for the pod to start up
  • starts port forwarding
./setup.sh

output:

+ ZILLA_CHART=oci://ghcr.io/aklivity/charts/zilla
+ helm upgrade --install zilla-ws-echo oci://ghcr.io/aklivity/charts/zilla --namespace zilla-ws-echo --create-namespace --wait [...]
NAME: zilla-ws-echo
LAST DEPLOYED: [...]
NAMESPACE: zilla-ws-echo
STATUS: deployed
REVISION: 1
NOTES:
Zilla has been installed.
[...]
+ nc -z localhost 7114
+ kubectl port-forward --namespace zilla-ws-echo service/zilla 7114 7143
+ sleep 1
+ nc -z localhost 7114
Connection to localhost port 7114 [tcp/http-alt] succeeded!

Install wscat

npm install wscat -g

Verify behavior

wscat -c ws://localhost:7114/ -s echo

Type a Hello, world message and press enter.

output:

Connected (press CTRL+C to quit)
> Hello, world
< Hello, world

wscat -c wss://localhost:7143/ --ca test-ca.crt -s echo

Type a Hello, world message and press enter.

output:

Connected (press CTRL+C to quit)
> Hello, world
< Hello, world

Teardown

The teardown.sh script stops port forwarding, uninstalls Zilla and deletes the namespace.

./teardown.sh

output:

+ pgrep kubectl
99999
+ killall kubectl
+ helm uninstall zilla-ws-echo --namespace zilla-ws-echo
release "zilla-ws-echo" uninstalled
+ kubectl delete namespace zilla-ws-echo
namespace "zilla-ws-echo" deleted