health checks

app.json

@@ -0,0 +1,23 @@
+{
+  "name": "aprs.me",
+  "description": "APRS web service",
+  "scripts": {
+    "dokku": {
+      "predeploy": "",
+      "postdeploy": ""
+    }
+  },
+  "checks": {
+    "web": [
+      {
+        "type": "http",
+        "name": "web-health",
+        "path": "/health",
+        "attempts": 3,
+        "timeout": 5,
+        "wait": 10,
+        "initial_delay": 10
+      }
+    ]
+  }
+}

lib/aprs_web/controllers/page_controller.ex

@@ -12,4 +12,8 @@ defmodule AprsWeb.PageController do
   def packets(conn, _params) do
     render(conn, :packets)
   end
+
+  def health(conn, _params) do
+    json(conn, %{status: "ok", version: Application.spec(:aprs, :vsn)})
+  end
 end

lib/aprs_web/router.ex

@@ -17,6 +17,11 @@ defmodule AprsWeb.Router do
     plug :accepts, ["json"]
   end
 
+  scope "/", AprsWeb do
+    pipe_through :api
+    get "/health", PageController, :health
+  end
+
   scope "/", AprsWeb do
     pipe_through :browser