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https://github.com/nickburkard/aws-cdk-scala

Scala DSL for AWS CDK v2.
https://github.com/nickburkard/aws-cdk-scala

aws cdk cloud-infrastructure dsl infrastructure-as-code scala

Last synced: 3 months ago
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Scala DSL for AWS CDK v2.

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README 

        
# AWS CDK Scala



This library is now archived, no further changes will be accepted.



- [Overview](#overview)

- [Installation](#installation)

- [Usage](#usage)

- [Limitations](#limitations)

- [Acknowledgements](#acknowledgements)



# Overview



Scala DSL for [AWS CDK v2](https://docs.aws.amazon.com/cdk/latest/guide/work-with-cdk-v2.html).



### Purpose



- Pass around app & stack [scope](https://docs.aws.amazon.com/cdk/latest/guide/constructs.html) implicitly.

- Avoid using Java concepts.

  * No builder syntax.

  * Required & optional parameters.

  * ADTs instead of enums.

  * Scala collections (i.e. `List` & `Map`).



### Disclaimer



This library solely provides a lightweight DSL over the AWS CDK using metaprogramming.

Please refer to the underlying types from the AWS CDK along with the associated CloudFormation types

for official & up-to-date service documentation.



### Release Cadence



- Major, minor and patch versions are increased each time [aws-cdk-lib](https://mvnrepository.com/artifact/software.amazon.awscdk/aws-cdk-lib) increases associated versions.

- Patch version is increased for any non-breaking changes made to the DSL itself.



### Scala Support



| Version | Supported? |

| --- | --- |

| <= 2.11 | ❌ |

| 2.12 | ✔️|

| 2.13 | ✔️|

| 3 | ✔️|



Anything <= 2.11 will **not** be supported. Please do not ask or submit PRs for those versions.



# Installation



### CDK CLI



You must install v2 of the [CDK CLI](https://docs.aws.amazon.com/cdk/latest/guide/cli.html)

to synthesize CloudFormation templates.



```bash

npm install -g aws-cdk

```



### Library



Just like CDK v2, a single dependency is published for the DSL.



The latest version can be found on [mvn](https://mvnrepository.com/artifact/io.burkard/aws-cdk-scala)

and on the [releases](https://github.com/NickBurkard/aws-cdk-scala/releases) page.



```scala

val cdkVersion: String = ???



libraryDependencies += "io.burkard" %% "aws-cdk-scala" % cdkVersion

```



# Usage



### Scala



Create a CDK app within a module of your project.



```scala

package io.burkard.cdk.example



import cats.syntax.option._

import io.burkard.cdk._

import io.burkard.cdk.metadata._

import io.burkard.cdk.services.kinesisanalytics._

import io.burkard.cdk.services.kinesisanalytics.cfnApplicationV2._

import io.burkard.cdk.services.s3._



object ExampleApp extends CdkApp {

  CdkStack(id = "ExampleStack".some) { implicit stackCtx =>

    val envParameter = CfnTypedParameter.CfnStringParameter(

      name = "env",

      allowedValues = List("dev", "qa", "prod").some

    )

    val regionParameter = CfnTypedParameter.CfnStringParameter(

      name = "region",

      allowedValues = List("us-east-1", "us-west-2", "eu-west-1").some

    )



    val env = envParameter.value

    val region = regionParameter.value



    val bucket = Bucket(

      internalResourceId = "Code",

      accessControl = BucketAccessControl.Private.some,

      enforceSsl = true.some,

      encryption = BucketEncryption.S3Managed.some,

      versioned = true.some

    )



    CfnApplicationV2(

      internalResourceId = "Runtime",

      serviceExecutionRole = "arn:example-role",

      runtimeEnvironment = "FLINK-1_13",

      tags = List(

        CfnTag(key = "env", value = env),

        CfnTag(key = "region", value = region)

      ).some,

      applicationName = s"prefix-$env-app-name-$region".some,

      applicationConfiguration = ApplicationConfigurationProperty(

        applicationCodeConfiguration = ApplicationCodeConfigurationProperty(

          codeContent = CodeContentProperty(

            s3ContentLocation = S3ContentLocationProperty(

              fileKey = "code-key-in-s3",

              bucketArn = bucket.getBucketArn,

              objectVersion = "code-version".some

            ).some

          ),

          codeContentType = "ZIPFILE"

        ).some

      ).some

    )

  }

}

```



### CDK Configuration



Create a `cdk.json` file at the root of your project, specifying the command to run your CDK app.



```json

{

  "app": "sbt \"example/runMain io.burkard.cdk.example.ExampleApp\""

}

```



### Synthesis



Synthesize the application.



```bash

cdk synth

```



The result is a CloudFormation template in YAML.



```yaml

Parameters:

  env:

    Type: String

    AllowedValues:

      - dev

      - qa

      - prod

    NoEcho: false

  region:

    Type: String

    AllowedValues:

      - us-east-1

      - us-west-2

      - eu-west-1

    NoEcho: false

  BootstrapVersion:

    Type: AWS::SSM::Parameter::Value

    Default: /cdk-bootstrap/hnb659fds/version

    Description: Version of the CDK Bootstrap resources in this environment, automatically retrieved from SSM Parameter Store. [cdk:skip]

Resources:

  Code5B760EEF:

    Type: AWS::S3::Bucket

    Properties:

      AccessControl: Private

      BucketEncryption:

        ServerSideEncryptionConfiguration:

          - ServerSideEncryptionByDefault:

              SSEAlgorithm: AES256

      VersioningConfiguration:

        Status: Enabled

    UpdateReplacePolicy: Retain

    DeletionPolicy: Retain

    Metadata:

      aws:cdk:path: ExampleStack/Code/Resource

  CodePolicyAA48735C:

    Type: AWS::S3::BucketPolicy

    Properties:

      Bucket:

        Ref: Code5B760EEF

      PolicyDocument:

        Statement:

          - Action: s3:*

            Condition:

              Bool:

                aws:SecureTransport: "false"

            Effect: Deny

            Principal:

              AWS: "*"

            Resource:

              - Fn::GetAtt:

                  - Code5B760EEF

                  - Arn

              - Fn::Join:

                  - ""

                  - - Fn::GetAtt:

                        - Code5B760EEF

                        - Arn

                    - /*

        Version: "2012-10-17"

    Metadata:

      aws:cdk:path: ExampleStack/Code/Policy/Resource

  Runtime:

    Type: AWS::KinesisAnalyticsV2::Application

    Properties:

      RuntimeEnvironment: FLINK-1_13

      ServiceExecutionRole: arn:example-role

      ApplicationConfiguration:

        ApplicationCodeConfiguration:

          CodeContent:

            S3ContentLocation:

              BucketARN:

                Fn::GetAtt:

                  - Code5B760EEF

                  - Arn

              FileKey: code-key-in-s3

              ObjectVersion: code-version

          CodeContentType: ZIPFILE

      ApplicationName:

        Fn::Join:

          - ""

          - - prefix-

            - Ref: env

            - -app-name-

            - Ref: region

      Tags:

        - Key: env

          Value:

            Ref: env

        - Key: region

          Value:

            Ref: region

    Metadata:

      aws:cdk:path: ExampleStack/Runtime

```



# Limitations



- Builders which use overloading for optional parameters (same name but different types)

are represented as `paramName0`, `paramName1`, etc..



# Acknowledgements



- Inspired by [AWS CDK Kotlin DSL](https://github.com/Semantic-Configuration/AWS-CDK-Kotlin-DSL).