feat(apigateway): support function alias in LambdaIntegration

Accept IFunction in LambdaIntegration instead of Function so that a lambda function Alias may be referenced as an API Gateway integration.

packages/@aws-cdk/aws-apigateway/lib/lambda-api.ts

@@ -12,7 +12,7 @@ export interface LambdaRestApiProps {
  * This handler will be used as a the default integration for all methods in
  * this API, unless specified otherwise in `addMethod`.
  */
- handler: lambda.Function;
+ handler: lambda.IFunction;
 
  /**
  * If true, route all requests to the Lambda Function

packages/@aws-cdk/aws-apigateway/test/test.lambda-api.ts

@@ -71,6 +71,73 @@ export = {
  test.done();
  },
 
+ 'LambdaRestApi supports function Alias'(test: Test) {
+ // GIVEN
+ const stack = new cdk.Stack();
+
+ const handler = new lambda.Function(stack, 'handler', {
+ handler: 'index.handler',
+ code: lambda.Code.inline('boom'),
+ runtime: lambda.Runtime.NodeJS610,
+ });
+ const alias = new lambda.Alias(stack, 'alias', {
+ aliasName: 'my-alias',
+ version: new lambda.Version(stack, 'version', {
+ lambda: handler
+ })
+ });
+
+ // WHEN
+ const api = new apigw.LambdaRestApi(stack, 'lambda-rest-api', { handler: alias });
+
+ // THEN -- can't customize further
+ test.throws(() => {
+ api.root.addResource('cant-touch-this');
+ });
+
+ // THEN -- template proxies everything
+ expect(stack).to(haveResource('AWS::ApiGateway::Resource', {
+ "PathPart": "{proxy+}"
+ }));
+
+ expect(stack).to(haveResource('AWS::ApiGateway::Method', {
+ "HttpMethod": "ANY",
+ "ResourceId": {
+ "Ref": "lambdarestapiproxyE3AE07E3"
+ },
+ "RestApiId": {
+ "Ref": "lambdarestapiAAD10924"
+ },
+ "AuthorizationType": "NONE",
+ "Integration": {
+ "IntegrationHttpMethod": "POST",
+ "Type": "AWS_PROXY",
+ "Uri": {
+ "Fn::Join": [
+ "",
+ [
+ "arn:",
+ {
+ "Ref": "AWS::Partition"
+ },
+ ":apigateway:",
+ {
+ "Ref": "AWS::Region"
+ },
+ ":lambda:path/2015-03-31/functions/",
+ {
+ "Ref": "alias68BF17F5"
+ },
+ "/invocations"
+ ]
+ ]
+ }
+ }
+ }));
+
+ test.done();
+ },
+
  'when "proxy" is set to false, users need to define the model'(test: Test) {
  // GIVEN
  const stack = new cdk.Stack();