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tcp.reflect

Listens on tcp port 12345 and will echo back whatever is sent to the server, broadcasting to all clients.

Requirements

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

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-tcp-reflect oci://ghcr.io/aklivity/charts/zilla --namespace zilla-tcp-reflect [...]
NAME: zilla-tcp-reflect
LAST DEPLOYED: [...]
NAMESPACE: zilla-tcp-reflect
STATUS: deployed
REVISION: 1
NOTES:
Zilla has been installed.
[...]
+ nc -z localhost 12345
+ kubectl port-forward --namespace zilla-tcp-reflect service/zilla 12345
+ sleep 1
+ nc -z localhost 12345
Connection to localhost port 12345 [tcp/italk] succeeded!

Verify behavior

Connect each client first, then send Hello, one from first client, then send Hello, two from second client.

nc localhost 12345

Type a Hello, one message and press enter.

output:

Hello, one
Hello, one
Hello, two

nc localhost 12345

Type a Hello, two message and press enter.

output:

Hello, one
Hello, two
Hello, two

Teardown

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

./teardown.sh

output:

+ pgrep kubectl
99999
+ killall kubectl
+ helm uninstall zilla-tcp-reflect --namespace zilla-tcp-reflect
release "zilla-tcp-reflect" uninstalled
+ kubectl delete namespace zilla-tcp-reflect
namespace "zilla-tcp-reflect" deleted