feat(lambda): allow specify event sources in props (#1746)

To enable declarative use cases, allow specifying IEventSources
when defining the function.

Author: Elad Ben-Israel

packages/@aws-cdk/aws-lambda/lib/function.ts

@@ -4,6 +4,7 @@ import iam = require('@aws-cdk/aws-iam');
 import sqs = require('@aws-cdk/aws-sqs');
 import cdk = require('@aws-cdk/cdk');
 import { Code } from './code';
+import { IEventSource } from './event-source';
 import { FunctionBase, FunctionImportProps, IFunction } from './function-base';
 import { Version } from './lambda-version';
 import { CfnFunction } from './lambda.generated';
@@ -190,6 +191,13 @@ export interface FunctionProps {
    * @see https://docs.aws.amazon.com/lambda/latest/dg/concurrent-executions.html
    */
   reservedConcurrentExecutions?: number;
+
+  /**
+   * Event sources for this function.
+   *
+   * You can also add event sources using `addEventSource`.
+   */
+  events?: IEventSource[];
 }
 
 /**
@@ -383,6 +391,10 @@ export class Function extends FunctionBase {
     for (const layer of props.layers || []) {
       this.addLayer(layer);
     }
+
+    for (const event of props.events || []) {
+      this.addEventSource(event);
+    }
   }
 
   /**

packages/@aws-cdk/aws-lambda/test/test.lambda.ts

@@ -1259,6 +1259,34 @@ export = {
           Runtime: 'nodejs' },
           DependsOn: [ 'MyLambdaServiceRole4539ECB6' ] } } });
     test.done();
+  },
+
+  'its possible to specify event sources upon creation'(test: Test) {
+    // GIVEN
+    const stack = new cdk.Stack();
+
+    let bindCount = 0;
+
+    class EventSource implements lambda.IEventSource {
+      public bind(_: lambda.FunctionBase): void {
+        bindCount++;
+      }
+    }
+
+    // WHEN
+    new lambda.Function(stack, 'fn', {
+      code: lambda.Code.inline('boom'),
+      runtime: lambda.Runtime.NodeJS810,
+      handler: 'index.bam',
+      events: [
+        new EventSource(),
+        new EventSource(),
+      ]
+    });
+
+    // THEN
+    test.deepEqual(bindCount, 2);
+    test.done();
   }
 };