services:
- name: proxy
  addr: :8080
  handler:
    type: http
    chain: my-chain
  listener:
    type: tcp

# Two live relays — both forward to the echo server. Relays never go down;
# liveness is driven solely by the cmd probes reading flag files in the
# container, so the test can flip node health without restarting anything.
- name: relay-a
  addr: 127.0.0.1:18081
  handler:
    type: http
  listener:
    type: tcp

- name: relay-b
  addr: 127.0.0.1:18082
  handler:
    type: http
  listener:
    type: tcp

chains:
- name: my-chain
  hops:
  - name: hop-1
    selector:
      strategy: lowestlatency
      maxFails: 1
      failTimeout: 10s
    nodes:
    - name: node-a
      addr: 127.0.0.1:18081
      connector:
        type: http
      probe:
        # exits 1 while /tmp/a_down exists → node marked dead by probe.
        type: cmd
        command: "test -f /tmp/a_down && exit 1 || exit 0"
        interval: 2s
    - name: node-b
      addr: 127.0.0.1:18082
      connector:
        type: http
      probe:
        type: cmd
        command: "test -f /tmp/b_down && exit 1 || exit 0"
        interval: 2s