route-adapter: its step is a run-once process (hq ADR 0198)

The mesh-route-adapter container goes with its Dockerfile and build bases. The step runs node on the bundle as a run-once process, reading what the mesh contributed and its config where the mesh writes them and writing the proxy's dynamic directory at the path the container used to mount; it still runs again when a route or its config changes.

modules/route-adapter/Dockerfile

@@ -1,24 +0,0 @@
-# route-adapter's runtime: the tool runtime, carrying this module's compiled code.
-#
-# **Built from this module's own directory and nothing else.** The sdk and the tool runtime are in
-# the base images, published like any other artifact — which is what makes this buildable by the
-# mesh from a repository and a path (novox/hq ADR 0069) rather than only on a workstation that
-# happens to have the siblings.
-#
-# Two bases, named rather than pinned (novox/hq issue 044): the image this is COMPILED in and the
-# image it RUNS in — the second must not carry a compiler. Declared in module.json's `build.on`.
-ARG BUILD_BASE
-ARG RUNTIME_BASE
-
-FROM ${BUILD_BASE} AS build
-WORKDIR /app/modules/route-adapter
-COPY . .
-RUN node /app/node_modules/typescript/bin/tsc adapter.ts index.ts \
-      --module NodeNext --moduleResolution NodeNext --target ES2022 --outDir dist
-
-FROM ${RUNTIME_BASE}
-COPY --from=build /app/modules/route-adapter/dist /app/modules/route-adapter/dist
-# **No MESH_TOOL_MODULES, deliberately.** This module serves no tool and consumes no event: it is a
-# step the host runs to completion, named by the container's `args` as `mesh-tools run …`. Setting a
-# serve-time entrypoint here would give the image a second way to be started — one that connects to
-# the broker and never exits.

modules/route-adapter/module.json

@@ -47,23 +47,18 @@
     },
     {
       "id": "adapt",
-      "type": "container",
-      "name": "mesh-route-adapter",
-      "artifact": "runtime",
-      "run-once": true,
-      "volumes": [
-        "${dir:routes-dir}/mesh.json:${dir:routes-dir}/mesh.json:ro",
-        "${dir:state}/config.json:/run/config/config.json:ro",
-        "${access:dynamic}:/services/traefik/dynamic"
+      "type": "process",
+      "name": "route-adapter",
+      "artifact": "code",
+      "run": [
+        "node",
+        "index.js"
       ],
+      "run-once": true,
       "env": {
         "MESH_RECEIVES": "${dir:routes-dir}/mesh.json",
-        "MESH_ROUTE_ADAPTER_CONFIG": "/run/config/config.json"
+        "MESH_ROUTE_ADAPTER_CONFIG": "${dir:state}/config.json"
       },
-      "args": [
-        "run",
-        "/app/modules/route-adapter/dist/index.js"
-      ],
       "restart-on": [
         "received-route",
         "config"
@@ -71,23 +66,14 @@
     }
   ],
   "build": {
-    "on": [
-      {
-        "arg": "BUILD_BASE",
-        "module": "mesh-tools",
-        "artifact": "build"
-      },
-      {
-        "arg": "RUNTIME_BASE",
-        "module": "mesh-tools",
-        "artifact": "runtime"
-      }
-    ],
     "artifacts": [
       {
-        "name": "runtime",
-        "kind": "image",
-        "from": "Dockerfile"
+        "name": "code",
+        "kind": "bundle",
+        "language": "typescript",
+        "entrypoints": [
+          "index.js"
+        ]
       }
     ]
   }