feat(iotevents): add IoT Events input L2 Construct (aws#17847)

This is proposed by aws#17711.

This PR was created for implemeting `Input` L2 Construct. Implementing it is needed before `DetectorModel`. The reason is described in here: aws#17711 (comment)

----

*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-iotevents/README.md

@@ -1,4 +1,5 @@
 # AWS::IoTEvents Construct Library
+
 <!--BEGIN STABILITY BANNER-->
 
 ---
@@ -9,23 +10,45 @@
 >
 > [CFN Resources]: https://docs.aws.amazon.com/cdk/latest/guide/constructs.html#constructs_lib
 
+![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 your source code when upgrading to a newer version of this package.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 module is part of the [AWS Cloud Development Kit](https://github.com/aws/aws-cdk) project.
+AWS IoT Events enables you to monitor your equipment or device fleets for
+failures or changes in operation, and to trigger actions when such events
+occur. 
+
+## Installation
+
+Install the module:
+
+```console
+$ npm i @aws-cdk/aws-iotevents
+```
+
+Import it into your code:
 
 ```ts nofixture
 import * as iotevents from '@aws-cdk/aws-iotevents';
 ```
 
-<!--BEGIN CFNONLY DISCLAIMER-->
-
-There are no hand-written ([L2](https://docs.aws.amazon.com/cdk/latest/guide/constructs.html#constructs_lib)) constructs for this service yet. 
-However, you can still use the automatically generated [L1](https://docs.aws.amazon.com/cdk/latest/guide/constructs.html#constructs_l1_using) constructs, and use this service exactly as you would using CloudFormation directly.
+## `Input`
 
-For more information on the resources and properties available for this service, see the [CloudFormation documentation for AWS::IoTEvents](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/AWS_IoTEvents.html).
+Add an AWS IoT Events input to your stack:
 
-(Read the [CDK Contributing Guide](https://github.com/aws/aws-cdk/blob/master/CONTRIBUTING.md) if you are interested in contributing to this construct library.)
+```ts
+import * as iotevents from '@aws-cdk/aws-iotevents';
 
-<!--END CFNONLY DISCLAIMER-->
+new iotevents.Input(this, 'MyInput', {
+  inputName: 'my_input',
+  attributeJsonPaths: ['payload.temperature'],
+});
+```

packages/@aws-cdk/aws-iotevents/lib/index.ts

@@ -1,2 +1,4 @@
+export * from './input';
+
 // AWS::IoTEvents CloudFormation Resources:
 export * from './iotevents.generated';

packages/@aws-cdk/aws-iotevents/lib/input.ts

@@ -0,0 +1,71 @@
+import { Resource, IResource } from '@aws-cdk/core';
+import { Construct } from 'constructs';
+import { CfnInput } from './iotevents.generated';
+
+/**
+ * Represents an AWS IoT Events input
+ */
+export interface IInput extends IResource {
+  /**
+   * The name of the input
+   * @attribute
+   */
+  readonly inputName: string;
+}
+
+/**
+ * Properties for defining an AWS IoT Events input
+ */
+export interface InputProps {
+  /**
+   * The name of the input
+   *
+   * @default - CloudFormation will generate a unique name of the input
+   */
+  readonly inputName?: string,
+
+  /**
+   * An expression that specifies an attribute-value pair in a JSON structure.
+   * Use this to specify an attribute from the JSON payload that is made available
+   * by the input. Inputs are derived from messages sent to AWS IoT Events (BatchPutMessage).
+   * Each such message contains a JSON payload. The attribute (and its paired value)
+   * specified here are available for use in the condition expressions used by detectors.
+   */
+  readonly attributeJsonPaths: string[];
+}
+
+/**
+ * Defines an AWS IoT Events input in this stack.
+ */
+export class Input extends Resource implements IInput {
+  /**
+   * Import an existing input
+   */
+  public static fromInputName(scope: Construct, id: string, inputName: string): IInput {
+    class Import extends Resource implements IInput {
+      public readonly inputName = inputName;
+    }
+    return new Import(scope, id);
+  }
+
+  public readonly inputName: string;
+
+  constructor(scope: Construct, id: string, props: InputProps) {
+    super(scope, id, {
+      physicalName: props.inputName,
+    });
+
+    if (props.attributeJsonPaths.length === 0) {
+      throw new Error('attributeJsonPaths property cannot be empty');
+    }
+
+    const resource = new CfnInput(this, 'Resource', {
+      inputName: this.physicalName,
+      inputDefinition: {
+        attributes: props.attributeJsonPaths.map(path => ({ jsonPath: path })),
+      },
+    });
+
+    this.inputName = this.getResourceNameAttribute(resource.ref);
+  }
+}

packages/@aws-cdk/aws-iotevents/package.json

@@ -76,9 +76,11 @@
   "devDependencies": {
     "@aws-cdk/assertions": "0.0.0",
     "@aws-cdk/cdk-build-tools": "0.0.0",
+    "@aws-cdk/cdk-integ-tools": "0.0.0",
     "@aws-cdk/cfn2ts": "0.0.0",
     "@aws-cdk/pkglint": "0.0.0",
-    "@types/jest": "^27.0.3"
+    "@types/jest": "^27.0.3",
+    "jest": "^27.3.1"
   },
   "dependencies": {
     "@aws-cdk/core": "0.0.0",
@@ -92,7 +94,7 @@
     "node": ">= 10.13.0 <13 || >=13.7.0"
   },
   "stability": "experimental",
-  "maturity": "cfn-only",
+  "maturity": "experimental",
   "awscdkio": {
     "announce": false
   },

packages/@aws-cdk/aws-iotevents/test/input.test.ts

@@ -0,0 +1,78 @@
+import { Template } from '@aws-cdk/assertions';
+import * as cdk from '@aws-cdk/core';
+import * as iotevents from '../lib';
+
+test('Default property', () => {
+  const stack = new cdk.Stack();
+
+  // WHEN
+  new iotevents.Input(stack, 'MyInput', {
+    attributeJsonPaths: ['payload.temperature'],
+  });
+
+  // THEN
+  Template.fromStack(stack).hasResourceProperties('AWS::IoTEvents::Input', {
+    InputDefinition: {
+      Attributes: [{ JsonPath: 'payload.temperature' }],
+    },
+  });
+});
+
+test('can get input name', () => {
+  const stack = new cdk.Stack();
+  // GIVEN
+  const input = new iotevents.Input(stack, 'MyInput', {
+    attributeJsonPaths: ['payload.temperature'],
+  });
+
+  // WHEN
+  new cdk.CfnResource(stack, 'Res', {
+    type: 'Test::Resource',
+    properties: {
+      InputName: input.inputName,
+    },
+  });
+
+  // THEN
+  Template.fromStack(stack).hasResourceProperties('Test::Resource', {
+    InputName: { Ref: 'MyInput08947B23' },
+  });
+});
+
+test('can set physical name', () => {
+  const stack = new cdk.Stack();
+
+  // WHEN
+  new iotevents.Input(stack, 'MyInput', {
+    inputName: 'test_input',
+    attributeJsonPaths: ['payload.temperature'],
+  });
+
+  // THEN
+  Template.fromStack(stack).hasResourceProperties('AWS::IoTEvents::Input', {
+    InputName: 'test_input',
+  });
+});
+
+test('can import a Input by inputName', () => {
+  const stack = new cdk.Stack();
+
+  // WHEN
+  const inputName = 'test-input-name';
+  const topicRule = iotevents.Input.fromInputName(stack, 'InputFromInputName', inputName);
+
+  // THEN
+  expect(topicRule).toMatchObject({
+    inputName,
+  });
+});
+
+test('cannot be created with an empty array of attributeJsonPaths', () => {
+  const stack = new cdk.Stack();
+
+  expect(() => {
+    new iotevents.Input(stack, 'MyInput', {
+      attributeJsonPaths: [],
+    });
+  }).toThrow('attributeJsonPaths property cannot be empty');
+});

packages/@aws-cdk/aws-iotevents/test/integ.detector-model.expected.json

@@ -0,0 +1,17 @@
+{
+  "Resources": {
+    "MyInput08947B23": {
+      "Type": "AWS::IoTEvents::Input",
+      "Properties": {
+        "InputDefinition": {
+          "Attributes": [
+            {
+              "JsonPath": "payload.temperature"
+            }
+          ]
+        },
+        "InputName": "test_input"
+      }
+    }
+  }
+}

packages/@aws-cdk/aws-iotevents/test/integ.detector-model.ts

@@ -0,0 +1,18 @@
+import * as cdk from '@aws-cdk/core';
+import * as iotevents from '../lib';
+
+const app = new cdk.App();
+
+class TestStack extends cdk.Stack {
+  constructor(scope: cdk.App, id: string, props?: cdk.StackProps) {
+    super(scope, id, props);
+
+    new iotevents.Input(this, 'MyInput', {
+      inputName: 'test_input',
+      attributeJsonPaths: ['payload.temperature'],
+    });
+  }
+}
+
+new TestStack(app, 'test-stack');
+app.synth();