Sort of working, about to refactor into a separate ts file

package.json

@@ -3,7 +3,7 @@
   "version": "0.1.0",
   "scripts": {
     "build": "tsup",
-    "start:server": "node external",
+    "start:server": "node external-service",
     "invoke": "node app",
     "test": "vitest"
   },

src/index.ts

@@ -1,5 +1,82 @@
 import { KinesisStreamEvent } from 'aws-lambda';
+import { KinesisStreamRecord } from 'aws-lambda/trigger/kinesis-stream';
+
+/*
+Making an assumption here that the eventblock layout is fairly static and that
+object fields such as booking_requested will only exist in the booking event,
+and other fields may be substituted in for other event types.
+
+*/
+export interface EventBlock {
+  id: string;
+  partitionKey: string;
+  timestamp: number;
+  type: string;
+  booking_requested?: BookingRequested;
+}
+
+export interface BookingRequested {
+  timestamp: number;
+  orderId: number;
+  product_provider: string;
+}
 
 export const handler = (event: KinesisStreamEvent) => {
-  console.log(event);
+  console.log('!!');
+  // console.log(event);
+
+  for (const elm of event.Records) {
+    console.log(elm);
+    console.log('>-<');
+    processEvent(elm);
+  }
 };
+
+function processEvent(event: KinesisStreamRecord) {
+  console.log(JSON.stringify(event));
+
+  let data: EventBlock | null = decodePayload(event.kinesis.data);
+
+  console.log('DecodePayload:: ', JSON.stringify(data));
+
+  if (data === null) {
+    return null;
+  }
+
+  if (data.hasOwnProperty('type')) {
+    switch (data.type) {
+      case 'booking_requested':
+        console.log('booking_requested');
+        transformPayload(data);
+        break;
+      default:
+        console.log('Default');
+    }
+  }
+}
+
+function decodePayload(data: any): EventBlock | null {
+  if (data === null) {
+    return null;
+  }
+
+  console.log('-----');
+  console.log(data);
+  console.log(atob(data));
+  console.log('-----');
+
+  try {
+    const eventBlock: EventBlock = JSON.parse(atob(data));
+
+    return eventBlock;
+  } catch (err) {
+    console.error(err);
+    return null;
+  }
+}
+
+function transformPayload(data: EventBlock) {
+  console.log('Transform and roll out');
+
+
+}

test/index.test.ts

@@ -2,4 +2,42 @@ describe('myTSTest', () => {
   it('should pass', () => {
     expect(1).toBe(1);
   });
+
+  describe('decodePayload', () => {
+    const properDataBase64 =
+      'eyJpZCI6ImE0Mzg4MTMyLTE0OTItMTFlYy1hMGIyLWM3OGZmYmQ2OTM0NyIsInBhcnRpdGlvbktleSI6IjJmY2U1M2YxLTFkYWYtNDI0Ny05MjQ1LTBhZDc4ZDBiMGQyZSIsInRpbWVzdGFtcCI6MTYzMTUzODA1OTQ1OSwidHlwZSI6ImJvb2tpbmdfcmVxdWVzdGVkIiwiYm9va2luZ19yZXF1ZXN0ZWQiOnsidGltZXN0YW1wIjoxNjMxNTM4MDU5NDU5LCJvcmRlcklkIjoxMDAxNywicHJvZHVjdF9wcm92aWRlciI6IlN0ZW5hIExpbmUifX0=';
+    const properDecodedData = {
+      id: 'a4388132-1492-11ec-a0b2-c78ffbd69347',
+      partitionKey: '2fce53f1-1daf-4247-9245-0ad78d0b0d2e',
+      timestamp: 1631538059459,
+      type: 'booking_requested',
+      booking_requested: {
+        timestamp: 1631538059459,
+        orderId: 10017,
+        product_provider: 'Stena Line',
+      },
+    };
+
+    it('should pass', () => {
+      expect().toEqual(properDecodedData);
+    });
+  });
+
+  describe('processEvent', () => {
+    it('should pass', () => {
+      expect(1).toBe(1);
+    });
+  });
+
+  describe('transformPayload', () => {
+    it('should pass', () => {
+      expect(1).toBe(1);
+    });
+  });
+
+  describe('handler', () => {
+    it('should pass', () => {
+      expect(1).toBe(1);
+    });
+  });
 });