Make caddy reload reactive on modified file

config/Caddyfile

@@ -15,4 +15,12 @@ http://*:8888 {
   handle_path /admin/* {
     reverse_proxy /* http://127.0.0.1:3000
   }
+
+      handle_path /faaso/exp/* {
+        reverse_proxy /* http://faaso-exp-6ne49v:3000 {
+          health_uri /ping
+          fail_duration 30s
+        }
+      }
+      
 }

shard.lock

@@ -36,6 +36,10 @@ shards:
     git: https://github.com/mamantoha/http_proxy.git
     version: 0.10.3
 
+  inotify:
+    git: https://github.com/petoem/inotify.cr.git
+    version: 1.0.3
+
   kemal:
     git: https://github.com/kemalcr/kemal.git
     version: 1.5.0

shard.yml

@@ -30,6 +30,8 @@ dependencies:
     github: kemalcr/kemal
   rucksack:
     github: busyloop/rucksack
+  inotify:
+    github: petoem/inotify.cr
     
 scripts:
   postinstall: cat .rucksack >> bin/faaso

src/daemon/proxy.cr

@@ -1,11 +1,17 @@
-require "docr"
 require "./funko.cr"
+require "docr"
+require "inotify"
 require "kemal"
 
 module Proxy
   CADDY_CONFIG_PATH = "config/Caddyfile"
   @@current_config = File.read(CADDY_CONFIG_PATH)
 
+  @@watcher = Inotify.watch(CADDY_CONFIG_PATH) do |_|
+    Log.info { "Reloading caddy config" }
+    Process.run(command: "caddy", args: ["reload", "--config", CADDY_CONFIG_PATH])
+  end
+
   # Get current proxy config
   get "/proxy/" do
     @@current_config
@@ -69,14 +75,13 @@ CONFIG
         file << config
       end
       # Reload config
-      Process.run(command: "caddy", args: ["reload", "--config", "Caddyfile"])
       @@current_config = config
     end
     config
   end
 end
 
-# Update proxy config once a second
+# Update proxy config every 1 second (if changed)
 spawn do
   loop do
     Proxy.update_proxy_config