update ratelimit daitogooglechat

@@ -126,6 +126,10 @@ This creates `config/daito-google-chat.php`.
 ```dotenv
 DAITO_GOOGLE_CHAT_ENABLED=true
 DAITO_GOOGLE_CHAT_WEBHOOK_URL=https://chat.googleapis.com/v1/spaces/.../messages?key=...&token=...
+DAITO_GOOGLE_CHAT_QUEUE_NAME=google-chat
+DAITO_GOOGLE_CHAT_RATE_LIMIT_ENABLED=true
+DAITO_GOOGLE_CHAT_RATE_LIMIT_MAX_JOBS=20
+DAITO_GOOGLE_CHAT_RATE_LIMIT_DECAY_SECONDS=60
 ```
 
 ### 3) Send immediately
@@ -195,6 +199,41 @@ DaitoGoogleChat::sendCardV2($arrCardV2);
 DaitoGoogleChat::queueCardV2($arrCardV2);
 ```
 
+### 8) Anti-spam notes (recommended for production)
+
+- Queue job is rate-limited globally by cache key (`daito-google-chat:webhook`).
+- Default limit is `20` jobs / `60` seconds (configurable).
+- Keep `queue_backoff_seconds` as-is to retry safely on transient errors.
+
+Main config keys in `config/daito-google-chat.php`:
+
+- `rate_limit_enabled`
+- `rate_limit_max_jobs`
+- `rate_limit_decay_seconds`
+- `rate_limit_key`
+- `queue_name` (default: `google-chat`)
+
+### 9) Run dedicated queue worker for google-chat
+
+Run a separate worker to isolate notification throughput:
+
+```bash
+php artisan queue:work --queue=google-chat --sleep=1 --tries=3 --timeout=30
+```
+
+Supervisor example:
+
+```ini
+[program:laravel-google-chat-worker]
+process_name=%(program_name)s_%(process_num)02d
+command=php /path/to/artisan queue:work --queue=google-chat --sleep=1 --tries=3 --timeout=30
+autostart=true
+autorestart=true
+numprocs=1
+redirect_stderr=true
+stdout_logfile=/var/log/supervisor/laravel-google-chat-worker.log
+```
+
 ## QueryLog (Laravel shared package)
 
 > **Provider registration note**

@@ -2,6 +2,7 @@
 
 namespace Daito\Lib\DaitoGoogleChat\Jobs;
 
+use Daito\Lib\DaitoGoogleChat\Middleware\DaitoGoogleChatRateLimitMiddleware;
 use Daito\Lib\DaitoGoogleChat\Services\DaitoGoogleChatWebhookClient;
 use Illuminate\Bus\Queueable;
 use Illuminate\Contracts\Queue\ShouldQueue;
@@ -31,4 +32,15 @@ class DaitoGoogleChatWebhookJob implements ShouldQueue
     {
         $client->send($this->arrPayload, $this->webhookUrl);
     }
+
+    public function middleware(): array
+    {
+        if (!(bool) config('daito-google-chat.rate_limit_enabled', true)) {
+            return array();
+        }
+
+        return array(
+            new DaitoGoogleChatRateLimitMiddleware(),
+        );
+    }
 }

+<?php
+
+namespace Daito\Lib\DaitoGoogleChat\Middleware;
+
+use Illuminate\Support\Facades\RateLimiter;
+
+class DaitoGoogleChatRateLimitMiddleware
+{
+    public function handle($job, $next): void
+    {
+        $rateLimitKey = (string) config('daito-google-chat.rate_limit_key', 'daito-google-chat:webhook');
+        $maxJobs = max(1, (int) config('daito-google-chat.rate_limit_max_jobs', 20));
+        $decaySeconds = max(1, (int) config('daito-google-chat.rate_limit_decay_seconds', 60));
+
+        if (RateLimiter::tooManyAttempts($rateLimitKey, $maxJobs)) {
+            $job->release(max(1, RateLimiter::availableIn($rateLimitKey)));
+            return;
+        }
+
+        RateLimiter::hit($rateLimitKey, $decaySeconds);
+        $next($job);
+    }
+}

@@ -12,8 +12,12 @@ return array(
     'retry_times' => env('DAITO_GOOGLE_CHAT_RETRY_TIMES', 1),
     'retry_sleep_ms' => env('DAITO_GOOGLE_CHAT_RETRY_SLEEP_MS', 200),
     'queue_connection' => env('DAITO_GOOGLE_CHAT_QUEUE_CONNECTION', null),
-    'queue_name' => env('DAITO_GOOGLE_CHAT_QUEUE_NAME', null),
+    'queue_name' => env('DAITO_GOOGLE_CHAT_QUEUE_NAME', 'google-chat'),
     'queue_tries' => env('DAITO_GOOGLE_CHAT_QUEUE_TRIES', 3),
     'queue_backoff_seconds' => env('DAITO_GOOGLE_CHAT_QUEUE_BACKOFF', 10),
+    'rate_limit_enabled' => env('DAITO_GOOGLE_CHAT_RATE_LIMIT_ENABLED', true),
+    'rate_limit_max_jobs' => env('DAITO_GOOGLE_CHAT_RATE_LIMIT_MAX_JOBS', 20),
+    'rate_limit_decay_seconds' => env('DAITO_GOOGLE_CHAT_RATE_LIMIT_DECAY_SECONDS', 60),
+    'rate_limit_key' => env('DAITO_GOOGLE_CHAT_RATE_LIMIT_KEY', 'daito-google-chat:webhook'),
     'throw_on_error' => env('DAITO_GOOGLE_CHAT_THROW_ON_ERROR', false),
 );