Add README content

Author: RaphaelManke

packages/@aws-cdk/aws-pipes-sources-alpha/README.md

@@ -17,17 +17,46 @@
 <!--END STABILITY BANNER-->
 
 
-EventBridge Pipes let you create source to target connections between several
-aws services. While transporting messages from a source to a target the messages
-can be filtered, transformed and enriched.
+EventBridge Pipes Sources let you create a source for a EventBridge Pipe.
 
-![diagram of pipes](https://d1.awsstatic.com/product-marketing/EventBridge/Product-Page-Diagram_Amazon-EventBridge-Pipes.cd7961854be4432d63f6158ffd18271d6c9fa3ec.png)
 
 For more details see the service documentation:
 
-[Documentation](https://docs.aws.amazon.com/eventbridge/latest/userguide/eb-pipes.html)
+[Documentation](https://docs.aws.amazon.com/eventbridge/latest/userguide/eb-pipes-event-source.html)
 
 ## Pipe sources
 
-// TODO
+Pipe sources are the starting point of a EventBridge Pipe. They are the source of the events that are sent to the pipe.
 
+### Amazon SQS
+
+A SQS message queue can be used as a source for a pipe. The queue will be polled for new messages and the messages will be sent to the pipe.
+
+```ts
+declare const sourceQueue: sqs.Queue;
+declare const targetQueue: sqs.Queue;
+
+const pipeSource = new sources.SqsSource(sourceQueue);
+
+const pipe = new pipes.Pipe(this, 'Pipe', {
+  source: pipeSource,
+  target: new SomeTarget(targetQueue)
+});
+```
+
+The polling configuration can be customized:
+
+```ts
+declare const sourceQueue: sqs.Queue;
+declare const targetQueue: sqs.Queue;
+
+const pipeSource = new sources.SqsSource(sourceQueue, {
+  batchSize: 10,
+  maximumBatchingWindow: cdk.Duration.seconds(10)
+});
+
+const pipe = new pipes.Pipe(this, 'Pipe', {
+  source: pipeSource,
+  target: new SomeTarget(targetQueue)
+});
+```

packages/@aws-cdk/aws-pipes-sources-alpha/rosetta/default.ts-fixture

@@ -5,25 +5,9 @@ import * as lambda from 'aws-cdk-lib/aws-lambda';
 import * as logs from 'aws-cdk-lib/aws-logs';
 import { Construct } from 'constructs';
 import * as pipes from '@aws-cdk/aws-pipes-alpha';
+import * as sources from '@aws-cdk/aws-pipes-sources-alpha';
 
-class SqsSource implements pipes.ISource {
-  sourceArn: string;
-  sourceParameters = undefined;
-  constructor(private readonly queue: sqs.Queue) {
-    this.queue = queue;
-    this.sourceArn = queue.queueArn;
-  }
-  bind(_pipe: pipes.IPipe): pipes.SourceConfig {
-    return {
-      sourceParameters: this.sourceParameters,
-    };
-  }
-  grantRead(pipeRole: cdk.aws_iam.IRole): void {
-    this.queue.grantConsumeMessages(pipeRole);
-  }
-}
-
-class SqsTarget implements pipes.ITarget {
+class SomeTarget implements pipes.ITarget {
   targetArn: string;
   inputTransformation: pipes.InputTransformation | undefined;
 
@@ -46,47 +30,6 @@ class SqsTarget implements pipes.ITarget {
   }
 }
 
-class LambdaEnrichment implements pipes.IEnrichment {
-  enrichmentArn: string;
-
-  private inputTransformation: pipes.InputTransformation  | undefined;
-  constructor(private readonly lambda: lambda.Function, props: {inputTransformation?: pipes.InputTransformation} = {}) {
-    this.enrichmentArn = lambda.functionArn;
-    this.inputTransformation = props?.inputTransformation
-  }
-  bind(pipe: pipes.IPipe): pipes.EnrichmentParametersConfig {
-    return {
-      enrichmentParameters: {
-        inputTemplate: this.inputTransformation?.bind(pipe).inputTemplate,
-      },
-    };
-  }
-  grantInvoke(pipeRole: cdk.aws_iam.IRole): void {
-    this.lambda.grantInvoke(pipeRole);
-  }
-}
-
-class CloudwatchDestination implements pipes.ILogDestination {
-  parameters: pipes.LogDestinationParameters;
-  constructor(private readonly logGroup: cdk.aws_logs.LogGroup) {
-    this.logGroup = logGroup;
-    this.parameters = {
-      cloudwatchLogsLogDestination: {
-        logGroupArn: logGroup.logGroupArn,
-      },
-    };
-  }
-  bind(_pipe: pipes.IPipe): pipes.LogDestinationConfig {
-    return {
-      parameters: this.parameters,
-    };
-  }
-
-  grantPush(pipeRole: cdk.aws_iam.IRole): void {
-    this.logGroup.grantWrite(pipeRole);
-  }
-}
-
 class Fixture extends cdk.Stack {
   constructor(scope: Construct, id: string) {
     super(scope, id);