{
  "module": "network-checker",
  "version": "1",
  "slug": "netcheck",
  "listens": [
    {
      "name": "probe",
      "port": 9876,
      "protocol": "tcp",
      "from": "mesh",
      "why": "what the other machines' checkers dial. Deliberately this module's own endpoint and nothing else's: it is admitted by exactly the rule that governs every internally-exposed service, so it fails when that rule is wrong. A probe on a port that is never closed — ssh, say — would have passed throughout the outage this module exists to catch (novox/hq ADR 0145)"
    }
  ],
  "facts": {
    "roster": {
      "path": "/var/lib/network-checker/roster.json",
      "template": "{\n \"generated\": \"by the mesh — do not edit; replaced whenever a machine joins or leaves\",\n \"node\": \"{{.Node}}\",\n \"machines\": [{{range $i, $m := .Machines}}{{if $i}},{{end}}\n  { \"name\": \"{{$m.Name}}\", \"fqdn\": \"{{$m.FQDN}}\", \"address\": \"{{$m.Address}}\" }{{end}}\n ]\n}\n"
    }
  },
  "build": {
    "artifacts": [
      {
        "name": "code",
        "kind": "bundle",
        "language": "typescript",
        "entrypoints": ["probe/index.js", "check/index.js"]
      }
    ]
  },
  "resources": [
    {
      "id": "state",
      "type": "directory",
      "path": "/var/lib/network-checker",
      "mode": "0700"
    },
    {
      "id": "probe",
      "type": "container",
      "name": "mesh-network-checker-probe",
      "args": ["run", "/app/modules/network-checker/dist/probe/index.js"],
      "ports": ["9876"],
      "state": "running",
      "env": { "MESH_NETWORK_CHECKER_PORT": "9876" }
    },
    {
      "id": "check",
      "type": "container",
      "name": "mesh-network-checker-check",
      "network": "host",
      "schedule": "*/5 * * * *",
      "args": ["run", "/app/modules/network-checker/dist/check/index.js"],
      "volumes": ["/var/lib/network-checker:/run/state"],
      "env": {
        "MESH_NETWORK_CHECKER_ROSTER": "/run/state/roster.json",
        "MESH_NETWORK_CHECKER_STATE": "/run/state",
        "MESH_NETWORK_CHECKER_PORT": "${port:9876}"
      }
    }
  ]
}