Add smarter traefik load balancing with health check

.env

@@ -1,6 +1,6 @@
 _APP_ENV=development
 _APP_LOCALE=en
-_APP_WORKER_PER_CORE=6
+_APP_WORKER_PER_CORE=1
 _APP_CONSOLE_WHITELIST_ROOT=disabled
 _APP_CONSOLE_WHITELIST_EMAILS=
 _APP_CONSOLE_WHITELIST_IPS=

app/controllers/api/health.php

@@ -51,8 +51,16 @@ App::get('/v1/health/version')
     ->label('sdk.response.code', Response::STATUS_CODE_OK)
     ->label('sdk.response.type', Response::CONTENT_TYPE_JSON)
     ->label('sdk.response.model', Response::MODEL_HEALTH_VERSION)
+    ->inject('http')
     ->inject('response')
-    ->action(function (Response $response) {
+    ->action(function (mixed $http, Response $response) {
+        $stats = $http->stats();
+        \var_dump(\gethostname() . ': ' . $stats['idle_worker_num'] . '/' . $stats['worker_num']);
+
+        if(($stats['idle_worker_num'] ?? 0) <= 1) {
+            throw new Exception(Exception::GENERAL_SERVER_ERROR, 'Can not process more requests at the moment.');
+        }
+
         $response->dynamic(new Document([ 'version' => APP_VERSION_STABLE ]), Response::MODEL_HEALTH_VERSION);
     });
 

app/controllers/web/home.php

@@ -10,6 +10,7 @@ App::get('/versions')
     ->label('scope', 'public')
     ->inject('response')
     ->action(function (Response $response) {
+        \sleep(60);
         $platforms = Config::getParam('platforms');
 
         $versions = [

app/http.php

@@ -327,4 +327,11 @@ $http->on('request', function (SwooleRequest $swooleRequest, SwooleResponse $swo
     }
 });
 
+$register->set('http', function () use ($http) {
+    return $http;
+});
+App::setResource('http', function ($register) {
+    return $register->get('http');
+}, ['register']);
+
 $http->start();

docker-compose.yml

@@ -44,7 +44,9 @@ services:
       - appwrite
 
   appwrite:
-    container_name: appwrite
+    deploy:
+      mode: replicated
+      replicas: 3
     <<: *x-logging
     image: appwrite-dev
     build:
@@ -53,8 +55,6 @@ services:
         DEBUG: false
         TESTING: true
         VERSION: dev
-    ports:
-      - 9501:80
     networks:
       - appwrite
     labels:
@@ -62,6 +62,9 @@ services:
       - "traefik.constraint-label-stack=appwrite"
       - "traefik.docker.network=appwrite"
       - "traefik.http.services.appwrite_api.loadbalancer.server.port=80"
+      - "traefik.http.services.appwrite_api.loadbalancer.healthcheck.path=/v1/health/version"
+      - "traefik.http.services.appwrite_api.loadbalancer.healthcheck.interval=3s"
+      - "traefik.http.services.appwrite_api.loadbalancer.healthcheck.timeout=2s"
       #http
       - traefik.http.routers.appwrite_api_http.entrypoints=appwrite_web
       - traefik.http.routers.appwrite_api_http.rule=PathPrefix(`/`)