feat(trigger): Allow trigger to work with Lambda functions with long timeouts

packages/@aws-cdk/triggers/README.md

@@ -39,6 +39,33 @@ new triggers.TriggerFunction(stack, 'MyTrigger', {
 In the above example, the AWS Lambda function defined in `myLambdaFunction` will
 be invoked when the stack is deployed.
 
+It is also possible to trigger a predefined Lambda function by using the `Trigger` construct:
+
+```ts
+import * as lambda from '@aws-cdk/aws-lambda';
+import * as triggers from '@aws-cdk/triggers';
+import { Stack } from '@aws-cdk/core';
+
+declare const stack: Stack;
+
+const func = new lambda.Function(stack, 'MyFunction', {
+  handler: 'index.handler',
+  runtime: lambda.Runtime.NODEJS_14_X,
+  code: lambda.Code.fromInline('foo'),
+});
+
+new triggers.Trigger(stack, 'MyTrigger', {
+  handler: func,
+  timeout: Duration.minutes(10),
+  invocationType: triggers.InvocationType.EVENT,
+});
+```
+
+Addition properties can be used to fine-tune the behaviour of the trigger. 
+The `timeout` property can be used to determine how long the invocation of the function should take.
+The `invocationType` property can be used to change the invocation type of the function. 
+This might be useful in scenarios where a fire-and-forget strategy for invoking the function is sufficient.
+
 ## Trigger Failures
 
 If the trigger handler fails (e.g. an exception is raised), the CloudFormation

packages/@aws-cdk/triggers/lib/lambda/index.ts

@@ -3,11 +3,16 @@
 // eslint-disable-next-line import/no-extraneous-dependencies
 import * as AWS from 'aws-sdk';
 
-export type InvokeFunction = (functionName: string) => Promise<AWS.Lambda.InvocationResponse>;
+export type InvokeFunction = (functionName: string, invocationType: string, timeout: number) => Promise<AWS.Lambda.InvocationResponse>;
 
-export const invoke: InvokeFunction = async (functionName) => {
-  const lambda = new AWS.Lambda();
-  const invokeRequest = { FunctionName: functionName };
+export const invoke: InvokeFunction = async (functionName, invocationType, timeout) => {
+  const lambda = new AWS.Lambda({
+    httpOptions: {
+      timeout,
+    },
+  });
+
+  const invokeRequest = { FunctionName: functionName, InvocationType: invocationType };
   console.log({ invokeRequest });
 
   // IAM policy changes can take some time to fully propagate
@@ -51,7 +56,10 @@ export async function handler(event: AWSLambda.CloudFormationCustomResourceEvent
     throw new Error('The "HandlerArn" property is required');
   }
 
-  const invokeResponse = await invoke(handlerArn);
+  const invocationType = event.ResourceProperties.InvocationType;
+  const timeout = event.ResourceProperties.Timeout;
+
+  const invokeResponse = await invoke(handlerArn, invocationType, timeout);
 
   if (invokeResponse.StatusCode !== 200) {
     throw new Error(`Trigger handler failed with status code ${invokeResponse.StatusCode}`);
@@ -68,7 +76,9 @@ export async function handler(event: AWSLambda.CloudFormationCustomResourceEvent
  */
 function parseError(payload: string | undefined): string {
   console.log(`Error payload: ${payload}`);
-  if (!payload) { return 'unknown handler error'; }
+  if (!payload) {
+    return 'unknown handler error';
+  }
   try {
     const error = JSON.parse(payload);
     const concat = [error.errorMessage, error.trace].filter(x => x).join('\n');

packages/@aws-cdk/triggers/lib/trigger.ts

@@ -2,6 +2,7 @@ import { join } from 'path';
 import * as lambda from '@aws-cdk/aws-lambda';
 import { CustomResource, CustomResourceProvider, CustomResourceProviderRuntime } from '@aws-cdk/core';
 import { Construct, IConstruct, Node } from 'constructs';
+import { Duration } from '../../core';
 
 /**
  * Interface for triggers.
@@ -61,6 +62,28 @@ export interface TriggerOptions {
   readonly executeOnHandlerChange?: boolean;
 }
 
+/**
+ * The invocation type to apply to a trigger. This determines whether the trigger function should await the result of the to be triggered function or not.
+ */
+export enum InvocationType {
+  /**
+   * Invoke the function synchronously. Keep the connection open until the function returns a response or times out.
+   * The API response includes the function response and additional data.
+   */
+  EVENT = 'Event',
+
+  /**
+   * Invoke the function asynchronously. Send events that fail multiple times to the function's dead-letter queue (if one is configured).
+   * The API response only includes a status code.
+   */
+  REQUEST_RESPONSE = 'RequestResponse',
+
+  /**
+   *  Validate parameter values and verify that the user or role has permission to invoke the function.
+   */
+  DRY_RUN = 'DryRun'
+}
+
 /**
  * Props for `Trigger`.
  */
@@ -69,6 +92,20 @@ export interface TriggerProps extends TriggerOptions {
    * The AWS Lambda function of the handler to execute.
    */
   readonly handler: lambda.Function;
+
+  /**
+   * The invocation type to invoke the Lambda function with.
+   *
+   * @default RequestResponse
+   */
+  readonly invocationType?: InvocationType;
+
+  /**
+   * The timeout of the invocation call of the Lambda function to be triggered.
+   *
+   * @default Duration.minutes(2)
+   */
+  readonly timeout?: Duration;
 }
 
 /**
@@ -95,6 +132,8 @@ export class Trigger extends Construct implements ITrigger {
       serviceToken: provider.serviceToken,
       properties: {
         HandlerArn: handlerArn,
+        InvocationType: props.invocationType ?? 'RequestResponse',
+        Timeout: props.timeout?.toMilliseconds() ?? Duration.minutes(2),
       },
     });
 

packages/@aws-cdk/triggers/test/integ.triggers.js.snapshot/MyStack.template.json

@@ -3,13 +3,13 @@
   "Topic198E71B3E": {
    "Type": "AWS::SNS::Topic",
    "DependsOn": [
-    "MyFunctionTriggerDB129D7B"
+    "MyTriggerFunctionTrigger5424E7A7"
    ]
   },
   "Topic269377B75": {
    "Type": "AWS::SNS::Topic"
   },
-  "MyFunctionServiceRole3C357FF2": {
+  "MyTriggerFunctionServiceRole1BB78C29": {
    "Type": "AWS::IAM::Role",
    "Properties": {
     "AssumeRolePolicyDocument": {
@@ -40,26 +40,26 @@
     ]
    }
   },
-  "MyFunction3BAA72D1": {
+  "MyTriggerFunction056842F6": {
    "Type": "AWS::Lambda::Function",
    "Properties": {
     "Code": {
      "ZipFile": "exports.handler = function() { console.log(\"hi\"); };"
     },
     "Role": {
      "Fn::GetAtt": [
-      "MyFunctionServiceRole3C357FF2",
+      "MyTriggerFunctionServiceRole1BB78C29",
       "Arn"
      ]
     },
     "Handler": "index.handler",
-    "Runtime": "nodejs14.x"
+    "Runtime": "nodejs16.x"
    },
    "DependsOn": [
-    "MyFunctionServiceRole3C357FF2"
+    "MyTriggerFunctionServiceRole1BB78C29"
    ]
   },
-  "MyFunctionTriggerDB129D7B": {
+  "MyTriggerFunctionTrigger5424E7A7": {
    "Type": "Custom::Trigger",
    "Properties": {
     "ServiceToken": {
@@ -69,7 +69,16 @@
      ]
     },
     "HandlerArn": {
-     "Ref": "MyFunctionCurrentVersion197490AF2cb2bc11080c1ef11d3b49c1f1603957"
+     "Ref": "MyTriggerFunctionCurrentVersion61957CE160cd5b4c06c4d00191dc10a647ea0777"
+    },
+    "InvocationType": "RequestResponse",
+    "Timeout": {
+     "amount": 2,
+     "unit": {
+      "label": "minutes",
+      "isoLabel": "M",
+      "inMillis": 60000
+     }
     }
    },
    "DependsOn": [
@@ -78,11 +87,11 @@
    "UpdateReplacePolicy": "Delete",
    "DeletionPolicy": "Delete"
   },
-  "MyFunctionCurrentVersion197490AF2cb2bc11080c1ef11d3b49c1f1603957": {
+  "MyTriggerFunctionCurrentVersion61957CE160cd5b4c06c4d00191dc10a647ea0777": {
    "Type": "AWS::Lambda::Version",
    "Properties": {
     "FunctionName": {
-     "Ref": "MyFunction3BAA72D1"
+     "Ref": "MyTriggerFunction056842F6"
     }
    }
   },
@@ -124,7 +133,29 @@
             [
              {
               "Fn::GetAtt": [
-               "MyFunction3BAA72D1",
+               "MyTriggerFunction056842F6",
+               "Arn"
+              ]
+             },
+             ":*"
+            ]
+           ]
+          }
+         ]
+        },
+        {
+         "Effect": "Allow",
+         "Action": [
+          "lambda:InvokeFunction"
+         ],
+         "Resource": [
+          {
+           "Fn::Join": [
+            "",
+            [
+             {
+              "Fn::GetAtt": [
+               "MyLambdaFunction67CCA873",
                "Arn"
               ]
              },
@@ -186,6 +217,87 @@
     "AWSCDKTriggerCustomResourceProviderCustomResourceProviderRoleE18FAF0A"
    ]
   },
+  "MyLambdaFunctionServiceRole313A4D46": {
+   "Type": "AWS::IAM::Role",
+   "Properties": {
+    "AssumeRolePolicyDocument": {
+     "Statement": [
+      {
+       "Action": "sts:AssumeRole",
+       "Effect": "Allow",
+       "Principal": {
+        "Service": "lambda.amazonaws.com"
+       }
+      }
+     ],
+     "Version": "2012-10-17"
+    },
+    "ManagedPolicyArns": [
+     {
+      "Fn::Join": [
+       "",
+       [
+        "arn:",
+        {
+         "Ref": "AWS::Partition"
+        },
+        ":iam::aws:policy/service-role/AWSLambdaBasicExecutionRole"
+       ]
+      ]
+     }
+    ]
+   }
+  },
+  "MyLambdaFunction67CCA873": {
+   "Type": "AWS::Lambda::Function",
+   "Properties": {
+    "Code": {
+     "ZipFile": "exports.handler = function() { await setTimeout(3*60*1000, \"hi\"); };"
+    },
+    "Role": {
+     "Fn::GetAtt": [
+      "MyLambdaFunctionServiceRole313A4D46",
+      "Arn"
+     ]
+    },
+    "Handler": "index.handler",
+    "Runtime": "nodejs16.x",
+    "Timeout": 900
+   },
+   "DependsOn": [
+    "MyLambdaFunctionServiceRole313A4D46"
+   ]
+  },
+  "MyLambdaFunctionCurrentVersion4FAB80ECdc4d4e257bb2b44c9c4b9231f0d16f4c": {
+   "Type": "AWS::Lambda::Version",
+   "Properties": {
+    "FunctionName": {
+     "Ref": "MyLambdaFunction67CCA873"
+    }
+   }
+  },
+  "MyTrigger": {
+   "Type": "Custom::Trigger",
+   "Properties": {
+    "ServiceToken": {
+     "Fn::GetAtt": [
+      "AWSCDKTriggerCustomResourceProviderCustomResourceProviderHandler97BECD91",
+      "Arn"
+     ]
+    },
+    "HandlerArn": {
+     "Ref": "MyLambdaFunctionCurrentVersion4FAB80ECdc4d4e257bb2b44c9c4b9231f0d16f4c"
+    },
+    "InvocationType": "Event",
+    "Timeout": 60000
+   },
+   "DependsOn": [
+    "Topic198E71B3E",
+    "Topic269377B75"
+   ],
+   "UpdateReplacePolicy": "Delete",
+   "DeletionPolicy": "Delete"
+  },
   "MySecondFunctionServiceRole5B930841": {
    "Type": "AWS::IAM::Role",
    "Properties": {
@@ -247,6 +359,15 @@
     },
     "HandlerArn": {
      "Ref": "MySecondFunctionCurrentVersion7D497B5D173a4bb1f758991022ea97d651403362"
+    },
+    "InvocationType": "RequestResponse",
+    "Timeout": {
+     "amount": 2,
+     "unit": {
+      "label": "minutes",
+      "isoLabel": "M",
+      "inMillis": 60000
+     }
     }
    },
    "UpdateReplacePolicy": "Delete",