switch to bluegreen deployments

Author: zcesur

fly.toml

@@ -10,6 +10,7 @@ kill_signal = 'SIGTERM'
 [build]
 
 [deploy]
+  strategy = "bluegreen"
   release_command = '/app/bin/migrate'
 
 [env]
@@ -24,7 +25,16 @@ kill_signal = 'SIGTERM'
   min_machines_running = 1
   processes = ['app']
 
-  [http_service.concurrency]
-    type = 'connections'
-    hard_limit = 1000
-    soft_limit = 100
+[http_service.concurrency]
+  type = 'connections'
+  hard_limit = 1000
+  soft_limit = 100
+
+[[http_service.checks]]
+  grace_period = "10s"
+  interval = "15s"
+  timeout = "2s"
+  method = "GET"
+  path = "/health"
+  [http_service.checks.headers]
+    X-Forwarded-Proto = "https"

lib/algora_web/controllers/health_controller.ex

@@ -0,0 +1,7 @@
+defmodule AlgoraWeb.HealthController do
+  use AlgoraWeb, :controller
+
+  def index(conn, _params) do
+    send_resp(conn, 200, "OK")
+  end
+end

lib/algora_web/endpoint.ex

@@ -66,6 +66,8 @@ defmodule AlgoraWeb.Endpoint do
   # Legacy tRPC endpoint
   defp canonical_host(%{path_info: ["api", "trpc" | _]} = conn, _opts), do: conn
 
+  defp canonical_host(%{path_info: ["health"]} = conn, _opts), do: conn
+
   defp canonical_host(%{host: "docs.algora.io"} = conn, _opts),
     do: redirect_to_canonical_host(conn, Path.join(["/docs", conn.request_path]))
 

lib/algora_web/router.ex

@@ -47,6 +47,8 @@ defmodule AlgoraWeb.Router do
     forward "/ingest", AlgoraWeb.Plugs.RewriteIngestPlug, upstream: :ingest_url
     forward "/observe/script.js", AlgoraWeb.Plugs.RewriteObserveJSPlug, upstream: "https://plausible.io/js/script.js"
     forward "/observe/event", AlgoraWeb.Plugs.RewriteObserveEventPlug, upstream: "https://plausible.io/api/event"
+
+    get "/health", AlgoraWeb.HealthController, :index
   end
 
   scope "/", AlgoraWeb do