projen-statemachine-example

projen-simple

npm (JS/TS)	PyPI (Python)	Maven (Java)	Go	NuGet
Link	Link	Link	Link	Link

Build a custom construct based on an example in an AWS Blog post and use projen to publish to 5 language repositories, i.e., npm, PyPI, Central Maven, NuGet, and Go.

Architecture

This library constrcution is referred to the first example in this AWS blog, Introducing Amazon API Gateway service integration for AWS Step Functions written by Benjanmin Smith. After you deploy the stack with whatever programming language you like, i.e., Typescript, Python, Java, or C sharp, you'll get a view similar to the following diagram:

How to utilize polyglot packages and deploy

TypeScript

$ cdk --init language typescript
$ yarn add projen-statemachine-example

import { StateMachineApiGatewayExample } from 'projen-statemachine-example';

 export class TypescriptStack extends cdk.Stack {
 constructor(scope: cdk.Construct, id: string, props?: cdk.StackProps) {
     super(scope, id, props);

     const stageName = 'default';
     const partPath = 'pets';
     const exampleConstruct = new StateMachineApiGatewayExample(this, 'KerKer', {
         stageName: stageName, partPath: partPath});

     new cdk.CfnOutput(this, 'OStateMachine', {
         value: exampleConstruct.stateMachine.stateMachineArn});
     new cdk.CfnOutput(this, 'OExecutionOutput', {
         value: exampleConstruct.executionInput, description: 'Sample input to StartExecution.'});
 }

Python

$ cdk init --language python
$ cat <<EOL > requirements.txt
aws-cdk.core
scotthsieh_projen_statemachine
EOL
$ python -m pip install -r requirements.txt

from aws_cdk import core as cdk
from scotthsieh_projen_statemachine import StateMachineApiGatewayExample

class PythonStack(cdk.Stack):
    def __init__(self, scope: cdk.Construct, construct_id: str, **kwargs) -> None:
         super().__init__(scope, construct_id, **kwargs)
         
         stage_name = 'default'
         part_path = 'pets'
         example_construct = StateMachineApiGatewayExample(
             self, 'PythonStatemachne', stage_name=stage_name, part_path=part_path,
         )

         cdk.CfnOutput(self, "OStateMachine",
             value=example_construct.state_machine.state_machine_arn
         )
         cdk.CfnOutput(self, "OExecutionOutput", value=example_construct.execution_input, description="Sample input to StartExecution.")

Java

$ cdk init --language java
$ mvn package

.
.
<properties>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     <custom.construct.version>0.1.20</custom.construct.version>
     <cdk.version>1.104.0</cdk.version>
     <junit.version>5.7.1</junit.version>
 </properties>
 .
 .
 <dependencies>
     <!-- AWS Cloud Development Kit -->
     .
     .
     .
     <dependency>
         <groupId>io.github.hsiehshujeng</groupId>
         <artifactId>projen-statemachine</artifactId>
         <version>${custom.construct.version}</version>
     </dependency>
     .
     .
     .
 </dependencies>

package com.myorg;

import software.amazon.awscdk.core.Construct;
import software.amazon.awscdk.core.CfnOutput;
import software.amazon.awscdk.core.CfnOutputProps;
import software.amazon.awscdk.core.Stack;
import software.amazon.awscdk.core.StackProps;
import io.github.hsiehshujeng.projen.statemachine.*;

public class JavaStack extends Stack {
    public JavaStack(final Construct scope, final String id) {
        this(scope, id, null);
     }

     public JavaStack(final Construct scope, final String id, final StackProps props) {
         super(scope, id, props);
         
         String stageName = "default";
         String partPath = "pets";
         StateMachineApiGatewayExample exampleConstruct = new StateMachineApiGatewayExample(this, "KerKer",
             StateMachineApiGatewayExampleProps.builder()
                 .stageName(stageName)
                 .partPath(partPath)
                 .build());

         new CfnOutput(this, "OStateMachine",
             CfnOutputProps.builder()
                 .value(exampleConstruct.getStateMachine().getStateMachineArn())
                 .build());
         new CfnOutput(this, "OExecutionOutput", CfnOutputProps.builder()
             .value(exampleConstruct.getExecutionInput())
             .description("Sample input to StartExecution.")
             .build());
     }
 }

C#

$ cdk init --language csharp
$ dotnet add src/Csharp package Projen.Statemachine --version 0.1.21

using Amazon.CDK;
using ScottHsieh.Examples;

namespace Csharp
{
    public class CsharpStack : Stack
    {
        internal CsharpStack(Construct scope, string id, IStackProps props = null) : base(scope, id, props)
        {
            string stageName = "default";
            string partPath = "pets";
            
            var exampleConstruct = new StateMachineApiGatewayExample(this, "KerKer", new StateMachineApiGatewayExampleProps
            {
                StageName = stageName,
                PartPath = partPath
            });
            
            new CfnOutput(this, "OStateMachine", new CfnOutputProps
            {
                Value = exampleConstruct.StateMachine.StateMachineArn
            });
            new CfnOutput(this, "OExecutionOutput", new CfnOutputProps
            {
                Value = exampleConstruct.ExecutionInput,
                Description = "Sample input to StartExecution."
            });
        }
    }
 }

References

• jsii reference
• aws-cdk-go
• jsii