feat(aws-kinesisanalyticsv2): L2 construct for Flink applications (#1…

…2464)

Opened for #12407.

Notes for review:

1. Flink and SQL applications share almost no properties so having separate ka.FlinkApplication and ka.SqlApplication constructs seems correct. I can't see why these would even share an abstract base class.
1. I'm trying to focus on shipping the Flink construct before SQL since they are so different and I haven't used an SQL application.
1. I unested lots of the configuration for discoverability. The Cfn naming is verbose (usually with prefixes) so collisions are unlikely. [This](https://github.com/aws-samples/amazon-kinesis-analytics-streaming-etl/blob/master/cdk/lib/streaming-etl.ts#L100) is a pretty good example of using CDK today to build a Flink app.

Running List of Open Questions
-------------------------------

1. ~aws-kinesisanalytics exports both `aws-kinesisanalytics` and `aws-kinesisanalyticsv2` generated code. How should we resolve this? Currently I've exported `aws-kinesisanalyticsv2` from `aws-kinesisanalyticsv2` and haven't changed the other package.~ Kept this package isolated from aws-kinesisanalytics at the expense of duplicate generated code. 
2. ~I'm not confident with the use cases for the `fromAttributes` factory. I'd prefer to leave this factory method out in this initial PR if possible, but I'm also open to comments about what use cases this should handle.~
3. ~All logging options could be flattened into FlinkApplicationProps (e.g. logRentention, logGroupName, logStreamName, logEncryptionKey...). My first thought was to provide a new `ka.Logging` type that can be passed to customize the logGroup and logStream. There may be some other middle ground that could let users pass in a logGroup and then a logStream.~ Went with the flat list of props added to FlinkApplicationProps
4. ~When I run `yarn build` I get this error even though I've already tagged the class.~
    Was missing a `gen` yarn script entry.
5. ~Should this module become `aws-flink-application` or `aws-kinesisanalytics-flink` to side step the confusion of having seemingly unrelated constructs in the same module at the expense of clashing with CloudFormation?~ New module name: `aws-kinesisanalytics-flink`.

Todo
----

- [x] Inline documentation
- [x] Add property groups
- [x] checkpointEnabled
- [x] minPauseBetweenCheckpoints
- [x] logLevel
- [x] metricsLevel
- [x] autoscalingEnabled
- [x] parallelism
- [x] parallelismPerKpu
- [x] snapshotsEnabled
- [x] Figure out fromAttributes approach
- [x] Add log stream
- [x] Decide on logging options approach
- [x] Add metrics access
- [x] Validate application name
- [x] Integration tests

----

*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

packages/@aws-cdk/aws-kinesisanalytics-flink/.eslintrc.js

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+const baseConfig = require('cdk-build-tools/config/eslintrc');
+baseConfig.parserOptions.project = __dirname + '/tsconfig.json';
+module.exports = baseConfig;

packages/@aws-cdk/aws-kinesisanalytics-flink/.gitignore

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+*.js
+*.js.map
+*.d.ts
+tsconfig.json
+node_modules
+*.generated.ts
+dist
+.jsii
+
+.LAST_BUILD
+.nyc_output
+coverage
+nyc.config.js
+.LAST_PACKAGE
+*.snk
+!.eslintrc.js
+!jest.config.js
+
+junit.xml

packages/@aws-cdk/aws-kinesisanalytics-flink/.npmignore

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+# Don't include original .ts files when doing `npm pack`
+*.ts
+!*.d.ts
+coverage
+.nyc_output
+*.tgz
+
+dist
+.LAST_PACKAGE
+.LAST_BUILD
+!*.js
+
+# Include .jsii
+!.jsii
+
+*.snk
+
+*.tsbuildinfo
+
+tsconfig.json
+.eslintrc.js
+jest.config.js
+
+# exclude cdk artifacts
+**/cdk.out
+junit.xml
+test/

packages/@aws-cdk/aws-kinesisanalytics-flink/LICENSE

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packages/@aws-cdk/aws-kinesisanalytics-flink/NOTICE

@@ -0,0 +1,2 @@
+AWS Cloud Development Kit (AWS CDK)
+Copyright 2018-2021 Amazon.com, Inc. or its affiliates. All Rights Reserved.

packages/@aws-cdk/aws-kinesisanalytics-flink/README.md

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+# Kinesis Analytics Flink 
+<!--BEGIN STABILITY BANNER-->
+
+---
+
+![cdk-constructs: Experimental](https://img.shields.io/badge/cdk--constructs-experimental-important.svg?style=for-the-badge)
+
+> The APIs of higher level constructs in this module are experimental and under active development.
+> They are subject to non-backward compatible changes or removal in any future version. These are
+> not subject to the [Semantic Versioning](https://semver.org/) model and breaking changes will be
+> announced in the release notes. This means that while you may use them, you may need to update
+> your source code when upgrading to a newer version of this package.
+
+---
+
+<!--END STABILITY BANNER-->
+
+This package provides constructs for creating Kinesis Analytics Flink
+applications. To learn more about using using managed Flink applications, see
+the [AWS developer
+guide](https://docs.aws.amazon.com/kinesisanalytics/latest/java/what-is.html).
+
+## Creating Flink Applications
+
+To create a new Flink application, use the `Application` construct:
+
+[simple flink application](test/integ.application.lit.ts)
+
+The `code` property can use `fromAsset` as shown above to reference a local jar
+file in s3 or `fromBucket` to reference a file in s3.
+
+[flink application using code from bucket](test/integ.application-code-from-bucket.lit.ts)
+
+The `propertyGroups` property provides a way of passing arbitrary runtime
+properties to your Flink application. You can use the
+aws-kinesisanalytics-runtime library to [retrieve these
+properties](https://docs.aws.amazon.com/kinesisanalytics/latest/java/how-properties.html#how-properties-access).
+
+```ts
+import * as flink from '@aws-cdk/aws-kinesisanalytics-flink';
+
+const flinkApp = new flink.Application(this, 'Application', {
+  // ...
+  propertyGroups: {
+    FlinkApplicationProperties: {
+      inputStreamName: 'my-input-kinesis-stream',
+      outputStreamName: 'my-output-kinesis-stream',
+    },
+  },
+});
+```
+
+Flink applications also have specific configuration for passing parameters
+when the Flink job starts. These include parameters for checkpointing,
+snapshotting, monitoring, and parallelism.
+
+```ts
+import * as logs from '@aws-cdk/aws-logs';
+
+const flinkApp = new flink.Application(this, 'Application', {
+  code: flink.ApplicationCode.fromBucket(bucket, 'my-app.jar'),
+  runtime: file.Runtime.FLINK_1_11,
+  checkpointingEnabled: true, // default is true
+  checkpointInterval: cdk.Duration.seconds(30), // default is 1 minute
+  minPausesBetweenCheckpoints: cdk.Duration.seconds(10), // default is 5 seconds
+  logLevel: flink.LogLevel.ERROR, // default is INFO
+  metricsLevel: flink.MetricsLevel.PARALLELISM, // default is APPLICATION
+  autoScalingEnabled: false, // default is true
+  parallelism: 32, // default is 1
+  parallelismPerKpu: 2, // default is 1
+  snapshotsEnabled: false, // default is true
+  logGroup: new logs.LogGroup(this, 'LogGroup'), // by default, a new LogGroup will be created
+});
+```

packages/@aws-cdk/aws-kinesisanalytics-flink/jest.config.js

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+const baseConfig = require('cdk-build-tools/config/jest.config');
+module.exports = baseConfig;