Adding warmer

apps/buildnumbr/src/lambda.ts

@@ -1,11 +1,15 @@
 import { Callback, Context, Handler } from 'aws-lambda';
 import serverless from 'serverless-http';
 import { bootstrapApp } from './bootstrap';
+import { Logger } from 'nestjs-pino';
+
+let logger: Logger;
 
 async function bootstrap(): Promise<Handler> {
   const app = await bootstrapApp();
   await app.init();
   const expressApp = app.getHttpAdapter().getInstance();
+  logger = app.get(Logger);
   return serverless(expressApp);
 }
 
@@ -19,5 +23,9 @@ export const handler: Handler = async (
   if (!bootstrappedHandler) {
     bootstrappedHandler = await bootstrap();
   }
+  if (event.source === 'serverless-plugin-warmup') {
+    logger?.log('WarmUp - Lambda is warm!');
+    return 'Lambda is warm!';
+  }
   return bootstrappedHandler(event, context, callback);
 };

package.json

@@ -61,6 +61,7 @@
     "prettier-plugin-organize-imports": "^3.2.4",
     "serverless-domain-manager": "^7.3.3",
     "serverless-dynamodb-autoscaling": "^0.6.2",
+    "serverless-plugin-warmup": "^8.3.0",
     "source-map-support": "^0.5.21",
     "supertest": "^6.3.3",
     "terser-webpack-plugin": "^5.3.10",

serverless.yml

@@ -4,9 +4,16 @@ frameworkVersion: '3'
 plugins:
   - serverless-dynamodb-autoscaling
   - serverless-domain-manager
+  - serverless-plugin-warmup
 
 custom:
   tableName: 'projects-table'
+  warmup:
+    default:
+      enabled: true
+      prewarm: true
+      events:
+        - schedule: rate(5 minutes)
   customDomains:
     domainName: 'buildnumbr.com'
     basePath: ''
@@ -54,6 +61,9 @@ functions:
     handler: dist/lambda.handler
     events:
       - httpApi: '*'
+    warmup:
+      default:
+        enabled: true
 
 resources:
   Resources: