fix: Use correct runtime versions for Lambda packagers (#35)

The default runtime version was always used in the Lambda packager. This caused the wrong versions of Python libraries to be installed.

Author: kichik

src/base.ts

@@ -202,6 +202,7 @@ export class BaseDependencyPackager extends Construct implements iam.IGrantable,
     } else if (this.type == DependencyPackagerType.LAMBDA) {
       const lambdaProps = {
         description: `Turbo layer packager for ${runtime}`,
+        runtime: runtime,
         timeout: Duration.minutes(15),
         memorySize: 1024,
         ephemeralStorageSize: Size.gibibytes(10),
@@ -216,6 +217,11 @@ export class BaseDependencyPackager extends Construct implements iam.IGrantable,
         this.provider = new PackagePythonFunction(this, 'Packager', lambdaProps);
       } else if (runtime.family == lambda.RuntimeFamily.NODEJS) {
         this.provider = new PackageNodejsFunction(this, 'Packager', lambdaProps);
+        // we can't set the runtime from here, so we have to manually override it.
+        // projen puts `...props` before its own `runtime` setting and so its default `runtime` always wins.
+        // https://github.com/projen/projen/blob/564341a55309e06939c86248bc76cabc590fd835/src/awscdk/lambda-function.ts#L253-L256
+        const func = this.provider.node.defaultChild as lambda.CfnFunction;
+        func.runtime = runtime.name;
       } else if (runtime.family == lambda.RuntimeFamily.RUBY) {
         this.provider = new PackageRubyFunction(this, 'Packager', lambdaProps);
       } else {

test/default.integ.snapshot/Turbo-Layer-Test.assets.json

@@ -235,15 +235,15 @@
         }
       }
     },
-    "db7d3b44e017b63db50197704b29eb97bac168a71ac559a53b3bf68db6f123aa": {
+    "fe6521518edb0de46de9d099e5e747350e8a6dab27f5cc38112716d0a7f6b9b0": {
       "source": {
         "path": "Turbo-Layer-Test.template.json",
         "packaging": "file"
       },
       "destinations": {
         "current_account-current_region": {
           "bucketName": "cdk-hnb659fds-assets-${AWS::AccountId}-${AWS::Region}",
-          "objectKey": "db7d3b44e017b63db50197704b29eb97bac168a71ac559a53b3bf68db6f123aa.json",
+          "objectKey": "fe6521518edb0de46de9d099e5e747350e8a6dab27f5cc38112716d0a7f6b9b0.json",
           "assumeRoleArn": "arn:${AWS::Partition}:iam::${AWS::AccountId}:role/cdk-hnb659fds-file-publishing-role-${AWS::AccountId}-${AWS::Region}"
         }
       }

test/default.integ.snapshot/Turbo-Layer-Test.template.json

@@ -3866,7 +3866,7 @@
     },
     "Handler": "index.handler",
     "MemorySize": 1024,
-    "Runtime": "nodejs14.x",
+    "Runtime": "nodejs16.x",
     "Timeout": 900
    },
    "DependsOn": [

test/default.integ.snapshot/manifest.json

@@ -17,7 +17,7 @@
         "validateOnSynth": false,
         "assumeRoleArn": "arn:${AWS::Partition}:iam::${AWS::AccountId}:role/cdk-hnb659fds-deploy-role-${AWS::AccountId}-${AWS::Region}",
         "cloudFormationExecutionRoleArn": "arn:${AWS::Partition}:iam::${AWS::AccountId}:role/cdk-hnb659fds-cfn-exec-role-${AWS::AccountId}-${AWS::Region}",
-        "stackTemplateAssetObjectUrl": "s3://cdk-hnb659fds-assets-${AWS::AccountId}-${AWS::Region}/db7d3b44e017b63db50197704b29eb97bac168a71ac559a53b3bf68db6f123aa.json",
+        "stackTemplateAssetObjectUrl": "s3://cdk-hnb659fds-assets-${AWS::AccountId}-${AWS::Region}/fe6521518edb0de46de9d099e5e747350e8a6dab27f5cc38112716d0a7f6b9b0.json",
         "requiresBootstrapStackVersion": 6,
         "bootstrapStackVersionSsmParameter": "/cdk-bootstrap/hnb659fds/version",
         "additionalDependencies": [

test/default.integ.snapshot/tree.json

@@ -5319,7 +5319,7 @@
                             },
                             "handler": "index.handler",
                             "memorySize": 1024,
-                            "runtime": "nodejs14.x",
+                            "runtime": "nodejs16.x",
                             "timeout": 900
                           }
                         },

test/nodejs.test.ts

@@ -1,4 +1,7 @@
-import { librariesToPackageJson } from '../src';
+import * as cdk from 'aws-cdk-lib';
+import { aws_lambda as lambda } from 'aws-cdk-lib';
+import { Match, Template } from 'aws-cdk-lib/assertions';
+import { librariesToPackageJson, NodejsDependencyPackager } from '../src';
 
 test('Inline version parsing', () => {
   const packageJson = librariesToPackageJson(['@aws-sdk/[email protected]', 'nothing', 'library@v595']);
@@ -10,3 +13,40 @@ test('Inline version parsing', () => {
     },
   });
 });
+
+test('Packager runtime version matches', () => {
+  const app = new cdk.App();
+  const stack = new cdk.Stack(app, 'test');
+
+  new NodejsDependencyPackager(stack, 'packager 14', {
+    runtime: lambda.Runtime.NODEJS_14_X,
+  });
+  new NodejsDependencyPackager(stack, 'packager 16', {
+    runtime: lambda.Runtime.NODEJS_16_X,
+  });
+  new NodejsDependencyPackager(stack, 'packager 18', {
+    runtime: lambda.Runtime.NODEJS_18_X,
+  });
+
+  const template = Template.fromStack(stack);
+
+  template.hasResourceProperties(
+    'AWS::Lambda::Function',
+    Match.objectLike({
+      Runtime: lambda.Runtime.NODEJS_14_X.name,
+    }),
+  );
+  template.hasResourceProperties(
+    'AWS::Lambda::Function',
+    Match.objectLike({
+      Runtime: lambda.Runtime.NODEJS_16_X.name,
+    }),
+  );
+  template.hasResourceProperties(
+    'AWS::Lambda::Function',
+    Match.objectLike({
+      Runtime: lambda.Runtime.NODEJS_18_X.name,
+    }),
+  );
+});
+

test/python.test.ts

@@ -0,0 +1,40 @@
+import * as cdk from 'aws-cdk-lib';
+import { aws_lambda as lambda } from 'aws-cdk-lib';
+import { Match, Template } from 'aws-cdk-lib/assertions';
+import { PythonDependencyPackager } from '../src';
+
+test('Packager runtime version matches', () => {
+  const app = new cdk.App();
+  const stack = new cdk.Stack(app, 'test');
+
+  new PythonDependencyPackager(stack, 'packager 3.7', {
+    runtime: lambda.Runtime.PYTHON_3_7,
+  });
+  new PythonDependencyPackager(stack, 'packager 3.8', {
+    runtime: lambda.Runtime.PYTHON_3_8,
+  });
+  new PythonDependencyPackager(stack, 'packager 3.9', {
+    runtime: lambda.Runtime.PYTHON_3_9,
+  });
+
+  const template = Template.fromStack(stack);
+
+  template.hasResourceProperties(
+    'AWS::Lambda::Function',
+    Match.objectLike({
+      Runtime: lambda.Runtime.PYTHON_3_7.name,
+    }),
+  );
+  template.hasResourceProperties(
+    'AWS::Lambda::Function',
+    Match.objectLike({
+      Runtime: lambda.Runtime.PYTHON_3_8.name,
+    }),
+  );
+  template.hasResourceProperties(
+    'AWS::Lambda::Function',
+    Match.objectLike({
+      Runtime: lambda.Runtime.PYTHON_3_9.name,
+    }),
+  );
+});