Add no-handler-update option to omit updating the handler on lambda

docs/update.md

@@ -16,6 +16,12 @@ claudia update {OPTIONS}
     * _Defaults to_: current directory
 *  `--config`:  (_optional_) Config file containing the resource names
     * _Defaults to_: claudia.json
+*  `--handler`:  (_optional_) Main function for Lambda to execute, as module.function
+    * _For example_: if it is in the main.js file and exported as router, this would be main.router
+*  `--no-handler-update`:  (_optional_) Do not update the handler in Lambda. This can be used in conjunction with `--handler`
+    when you want to validate a handler function name different from what is configured in Lambda. 
+    This is useful if additional layers wrap the handler (e.g., [Datadog](https://docs.datadoghq.com/serverless/installation/nodejs/?tab=custom)).
+    * _Defaults to_: updates handler if provided via `--handler` or ends in `'router'`
 *  `--timeout`:  (_optional_) The function execution time, in seconds, at which AWS Lambda should terminate the function
 *  `--runtime`:  (_optional_) Node.js runtime to use. For supported values, see
     http://docs.aws.amazon.com/lambda/latest/dg/API_CreateFunction.html

spec/update-spec.js

@@ -624,6 +624,7 @@ describe('update', () => {
 			]);
 		}).then(done, done.fail);
 	});
+
 	describe('handler option support', () => {
 		beforeEach(done => {
 			fsUtil.copy('spec/test-projects/hello-world', workingdir, true);
@@ -656,7 +657,15 @@ describe('update', () => {
 			.then(configuration => expect(configuration.Handler).toEqual('main.handler'))
 			.then(done, done.fail);
 		});
-
+		it('does not update AWS handler name with --no-handler-update', done => {
+			fsUtil.copy('spec/test-projects/api-gw-echo', workingdir, true);
+			underTest({source: workingdir, version: 'new', handler: 'main.proxyRouter', 'handler-update': false})
+				.then(() => getLambdaConfiguration())
+				.then(configuration => expect(configuration.Handler).toEqual('main.handler'))// TODO: this may be old
+				.then(() => getLambdaConfiguration('new'))
+				.then(configuration => expect(configuration.Handler).toEqual('main.handler'))
+				.then(done, done.fail);
+		});
 	});
 
 	describe('timeout option support', () => {

src/commands/update.js

@@ -230,12 +230,13 @@ module.exports = function update(options, optionalLogger) {
 	.then(() => lambda.getFunctionConfiguration({FunctionName: lambdaConfig.name}).promise())
 	.then(result => {
 		functionConfig = result;
-		requiresHandlerUpdate = apiConfig && apiConfig.id && /\.router$/.test(functionConfig.Handler);
+		const explicitNoUpdateHandler = options['handler-update'] === false;
+		requiresHandlerUpdate = !explicitNoUpdateHandler && apiConfig && apiConfig.id && /\.router$/.test(functionConfig.Handler);
 		if (requiresHandlerUpdate) {
 			functionConfig.Handler = functionConfig.Handler.replace(/\.router$/, '.proxyRouter');
 		} else if (options.handler) {
 			functionConfig.Handler = options.handler;
-			requiresHandlerUpdate = true;
+			requiresHandlerUpdate = !explicitNoUpdateHandler;
 		}
 	})
 	.then(() => {

src/tasks/wait-until-not-pending.js

@@ -5,10 +5,10 @@ module.exports = function waitUntilNotPending(lambda, functionName, timeout, ret
 		() => {
 			return lambda.getFunctionConfiguration({FunctionName: functionName}).promise()
 				.then(result => {
-					if (result.state === 'Failed') {
+					if (result.State === 'Failed') {
 						throw `Lambda resource update failed`;
 					}
-					if (result.state === 'Pending') {
+					if (result.State === 'Pending') {
 						throw 'Pending';
 					}
 					if (result.LastUpdateStatus === 'InProgress') {