feat(lambda-event-sources): tumbling window

packages/@aws-cdk/aws-lambda-event-sources/README.md

@@ -148,6 +148,7 @@ and add it to your Lambda function. The following parameters will impact Amazon
 * __parallelizationFactor__: The number of batches to concurrently process on each shard.
 * __retryAttempts__: The maximum number of times a record should be retried in the event of failure.
 * __startingPosition__: Will determine where to being consumption, either at the most recent ('LATEST') record or the oldest record ('TRIM_HORIZON'). 'TRIM_HORIZON' will ensure you process all available data, while 'LATEST' will ignore all records that arrived prior to attaching the event source.
+* __tumblingWindow__: The duration in seconds of a processing window when using streams.
 * __enabled__: If the DynamoDB Streams event source mapping should be enabled. The default is true.
 
 ```ts
@@ -192,6 +193,7 @@ behavior:
 * __parallelizationFactor__: The number of batches to concurrently process on each shard.
 * __retryAttempts__: The maximum number of times a record should be retried in the event of failure.
 * __startingPosition__: Will determine where to being consumption, either at the most recent ('LATEST') record or the oldest record ('TRIM_HORIZON'). 'TRIM_HORIZON' will ensure you process all available data, while 'LATEST' will ignore all records that arrived prior to attaching the event source.
+* __tumblingWindow__: The duration in seconds of a processing window when using streams.
 * __enabled__: If the DynamoDB Streams event source mapping should be enabled. The default is true.
 
 ```ts

packages/@aws-cdk/aws-lambda-event-sources/lib/stream.ts

@@ -78,6 +78,14 @@ export interface StreamEventSourceProps {
    */
   readonly maxBatchingWindow?: Duration;
 
+  /**
+   * The size of the tumbling windows to group records sent to DynamoDB or Kinesis
+   * Valid Range: 0 - 15 minutes
+   *
+   * @default - None
+   */
+  readonly tumblingWindow?: Duration;
+
   /**
    * If the stream event source mapping should be enabled.
    *
@@ -106,6 +114,7 @@ export abstract class StreamEventSource implements lambda.IEventSource {
       retryAttempts: this.props.retryAttempts,
       parallelizationFactor: this.props.parallelizationFactor,
       onFailure: this.props.onFailure,
+      tumblingWindow: this.props.tumblingWindow,
       enabled: this.props.enabled,
     };
   }

packages/@aws-cdk/aws-lambda-event-sources/test/integ.dynamodb.expected.json

@@ -99,6 +99,7 @@
             "StreamArn"
           ]
         },
+        "TumblingWindowInSeconds": 60,
         "StartingPosition": "TRIM_HORIZON"
       }
     },

packages/@aws-cdk/aws-lambda-event-sources/test/integ.dynamodb.ts

@@ -21,6 +21,7 @@ class DynamoEventSourceTest extends cdk.Stack {
     fn.addEventSource(new DynamoEventSource(queue, {
       batchSize: 5,
       startingPosition: lambda.StartingPosition.TRIM_HORIZON,
+      tumblingWindow: cdk.Duration.seconds(60),
     }));
   }
 }

packages/@aws-cdk/aws-lambda-event-sources/test/integ.kinesis.expected.json

@@ -106,6 +106,7 @@
             "Arn"
           ]
         },
+        "TumblingWindowInSeconds": 60,
         "StartingPosition": "TRIM_HORIZON"
       }
     },

packages/@aws-cdk/aws-lambda-event-sources/test/integ.kinesis.ts

@@ -13,6 +13,7 @@ class KinesisEventSourceTest extends cdk.Stack {
 
     fn.addEventSource(new KinesisEventSource(stream, {
       startingPosition: lambda.StartingPosition.TRIM_HORIZON,
+      tumblingWindow: cdk.Duration.seconds(60),
     }));
   }
 }

packages/@aws-cdk/aws-lambda-event-sources/test/test.dynamo.ts

@@ -76,6 +76,33 @@ export = {
     test.done();
   },
 
+  'specific tumblingWindow'(test: Test) {
+    // GIVEN
+    const stack = new cdk.Stack();
+    const fn = new TestFunction(stack, 'Fn');
+    const table = new dynamodb.Table(stack, 'T', {
+      partitionKey: {
+        name: 'id',
+        type: dynamodb.AttributeType.STRING,
+      },
+      stream: dynamodb.StreamViewType.NEW_IMAGE,
+    });
+
+    // WHEN
+    fn.addEventSource(new sources.DynamoEventSource(table, {
+      batchSize: 50,
+      startingPosition: lambda.StartingPosition.LATEST,
+      tumblingWindow: cdk.Duration.seconds(60),
+    }));
+
+    // THEN
+    expect(stack).to(haveResource('AWS::Lambda::EventSourceMapping', {
+      TumblingWindowInSeconds: 60,
+    }));
+
+    test.done();
+  },
+
   'specific batch size'(test: Test) {
     // GIVEN
     const stack = new cdk.Stack();

packages/@aws-cdk/aws-lambda-event-sources/test/test.kinesis.ts

@@ -76,6 +76,38 @@ export = {
     test.done();
   },
 
+  'specific tumblingWindowInSeconds'(test: Test) {
+    // GIVEN
+    const stack = new cdk.Stack();
+    const fn = new TestFunction(stack, 'Fn');
+    const stream = new kinesis.Stream(stack, 'S');
+
+    // WHEN
+    fn.addEventSource(new sources.KinesisEventSource(stream, {
+      batchSize: 50,
+      startingPosition: lambda.StartingPosition.LATEST,
+      tumblingWindow: cdk.Duration.seconds(60),
+    }));
+
+    // THEN
+    expect(stack).to(haveResource('AWS::Lambda::EventSourceMapping', {
+      'EventSourceArn': {
+        'Fn::GetAtt': [
+          'S509448A1',
+          'Arn',
+        ],
+      },
+      'FunctionName': {
+        'Ref': 'Fn9270CBC0',
+      },
+      'BatchSize': 50,
+      'StartingPosition': 'LATEST',
+      'TumblingWindowInSeconds': 60,
+    }));
+
+    test.done();
+  },
+
   'specific batch size'(test: Test) {
     // GIVEN
     const stack = new cdk.Stack();

packages/@aws-cdk/aws-lambda/lib/event-source-mapping.ts

@@ -168,6 +168,17 @@ export interface EventSourceMappingOptions {
    */
   readonly kafkaTopic?: string;
 
+  /**
+   * The size of the tumbling windows to group records sent to DynamoDB or Kinesis
+   *
+   * @see https://docs.aws.amazon.com/lambda/latest/dg/with-ddb.html#services-ddb-windows
+   *
+   * Valid Range: 0 - 15 minutes
+   *
+   * @default - None
+   */
+  readonly tumblingWindow?: cdk.Duration;
+
   /**
    * A list of host and port pairs that are the addresses of the Kafka brokers in a self managed "bootstrap" Kafka cluster
    * that a Kafka client connects to initially to bootstrap itself.
@@ -269,6 +280,10 @@ export class EventSourceMapping extends cdk.Resource implements IEventSourceMapp
       }
     });
 
+    if (props.tumblingWindow && !cdk.Token.isUnresolved(props.tumblingWindow) && props.tumblingWindow.toSeconds() > 900) {
+      throw new Error(`tumblingWindow cannot be over 900 seconds, got ${props.tumblingWindow.toSeconds()}`);
+    }
+
 
     let destinationConfig;
 
@@ -296,6 +311,7 @@ export class EventSourceMapping extends cdk.Resource implements IEventSourceMapp
       maximumRetryAttempts: props.retryAttempts,
       parallelizationFactor: props.parallelizationFactor,
       topics: props.kafkaTopic !== undefined ? [props.kafkaTopic] : undefined,
+      tumblingWindowInSeconds: props.tumblingWindow?.toSeconds(),
       sourceAccessConfigurations: props.sourceAccessConfigurations?.map((o) => {return { type: o.type.type, uri: o.uri };}),
       selfManagedEventSource,
     });

packages/@aws-cdk/aws-lambda/test/event-source-mapping.test.ts

@@ -261,4 +261,35 @@ describe('event source mapping', () => {
       SelfManagedEventSource: { Endpoints: { KafkaBootstrapServers: kafkaBootstrapServers } },
     });
   });
-});
+
+  test('throws if tumblingWindow > 900 seconds', () => {
+    const stack = new cdk.Stack();
+    const fn = new Function(stack, 'fn', {
+      handler: 'index.handler',
+      code: Code.fromInline('exports.handler = ${handler.toString()}'),
+      runtime: Runtime.NODEJS_10_X,
+    });
+
+    expect(() => new EventSourceMapping(stack, 'test', {
+      target: fn,
+      eventSourceArn: '',
+      tumblingWindow: cdk.Duration.seconds(901),
+    })).toThrow(/tumblingWindow cannot be over 900 seconds/);
+  });
+
+  test('accepts if tumblingWindow is a token', () => {
+    const stack = new cdk.Stack();
+    const fn = new Function(stack, 'fn', {
+      handler: 'index.handler',
+      code: Code.fromInline('exports.handler = ${handler.toString()}'),
+      runtime: Runtime.NODEJS_10_X,
+    });
+    const lazyDuration = cdk.Duration.seconds(cdk.Lazy.number({ produce: () => 60 }));
+
+    new EventSourceMapping(stack, 'test', {
+      target: fn,
+      eventSourceArn: '',
+      tumblingWindow: lazyDuration,
+    });
+  });
+});