# LambdaCode This project contains source code and supporting files for a serverless application that you can deploy with the SAM CLI. It includes the following files and folders. - Lambdacode - Code for the application's Lambda function. - LamdaAuthorizer - Code for Authentication on API Gateway. - template.yaml - A template that defines the application's AWS resources. The application uses several AWS resources, including Lambda functions and an API Gateway API. These resources are defined in the `template.yaml` file in this project. If you prefer to use an integrated development environment (IDE) to build and test your application, you can use the AWS Toolkit. The AWS Toolkit is an open source plug-in for popular IDEs that uses the SAM CLI to build and deploy serverless applications on AWS. The AWS Toolkit also adds a simplified step-through debugging experience for Lambda function code. See the following links to get started. - [CLion](https://docs.aws.amazon.com/toolkit-for-jetbrains/latest/userguide/welcome.html) - [GoLand](https://docs.aws.amazon.com/toolkit-for-jetbrains/latest/userguide/welcome.html) - [IntelliJ](https://docs.aws.amazon.com/toolkit-for-jetbrains/latest/userguide/welcome.html) - [WebStorm](https://docs.aws.amazon.com/toolkit-for-jetbrains/latest/userguide/welcome.html) - [Rider](https://docs.aws.amazon.com/toolkit-for-jetbrains/latest/userguide/welcome.html) - [PhpStorm](https://docs.aws.amazon.com/toolkit-for-jetbrains/latest/userguide/welcome.html) - [PyCharm](https://docs.aws.amazon.com/toolkit-for-jetbrains/latest/userguide/welcome.html) - [RubyMine](https://docs.aws.amazon.com/toolkit-for-jetbrains/latest/userguide/welcome.html) - [DataGrip](https://docs.aws.amazon.com/toolkit-for-jetbrains/latest/userguide/welcome.html) - [VS Code](https://docs.aws.amazon.com/toolkit-for-vscode/latest/userguide/welcome.html) - [Visual Studio](https://docs.aws.amazon.com/toolkit-for-visual-studio/latest/user-guide/welcome.html) ## Deploy the sample application The Serverless Application Model Command Line Interface (SAM CLI) is an extension of the AWS CLI that adds functionality for building and testing Lambda applications. It uses Docker to run your functions in an Amazon Linux environment that matches Lambda. It can also emulate your application's build environment and API. To use the SAM CLI, you need the following tools. - SAM CLI - [Install the SAM CLI](https://docs.aws.amazon.com/serverless-application-model/latest/developerguide/serverless-sam-cli-install.html) - Node.js - [Install Node.js 16](https://nodejs.org/en/), including the NPM package management tool. - Docker - [Install Docker community edition](https://hub.docker.com/search/?type=edition&offering=community) To build and deploy your application for the first time, run the following in your shell: ```bash sam build sam deploy --guided ``` The first command will build the source of your application. The second command will package and deploy your application to AWS, with a series of prompts: - **Stack Name**: The name of the stack to deploy to CloudFormation. This should be unique to your account and region, and a good starting point would be something matching your project name. - **AWS Region**: The AWS region you want to deploy your app to. - **PublishingAliasName**: Alias for the Lambda function (by default current). - **StageName**: Stage name that the API Gateway is going to have (by default prod). - **FunctionName**: Name provided to the Lambda function that returns SOAP data back (by default ProxyLambda). - **Confirm changes before deploy**: If set to yes, any change sets will be shown to you before execution for manual review. If set to no, the AWS SAM CLI will automatically deploy application changes. - **Allow SAM CLI IAM role creation**: Many AWS SAM templates, including this example, create AWS IAM roles required for the AWS Lambda function(s) included to access AWS services. This solution has multiple IAM Roles to access Secrets Manager or Cloudwatch. Please say "Yes" to this question. - **Save arguments to samconfig.toml**: If set to yes, your choices will be saved to a configuration file inside the project, so that in the future you can just re-run `sam deploy` without parameters to deploy changes to your application. You can find your API Gateway Endpoint URL in the output values displayed after deployment. ## Use the SAM CLI and VSCode to build and test locally Build your application with the `sam build` command. The SAM CLI installs dependencies defined in `Lambdacode/package.json` and `LambdaAuthorizer/package.json`, creates a deployment package, and saves it in the `.aws-sam/build` folder. Run functions locally and invoke them with the VSCode launch.json. Inside of that file there is the API /legacycompatible which injecting a payload executes the debug mode locally. ## Use Postman to test after deployment Use the Postmancollection-APIcall.json provided in NodeJSLambda folder to test this new deployment (review the custom values). https://learning.postman.com/docs/getting-started/importing-and-exporting-data/ The API url must be collected from the output of the SAM Deployment. The Authorization token must be collected from Secrets Manager console inside your AWS Account. ## Add a resource to your application The application template uses AWS Serverless Application Model (AWS SAM) to define application resources. AWS SAM is an extension of AWS CloudFormation with a simpler syntax for configuring common serverless application resources such as functions, triggers, and APIs. For resources not included in [the SAM specification](https://github.com/awslabs/serverless-application-model/blob/master/versions/2016-10-31.md), you can use standard [AWS CloudFormation](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-template-resource-type-ref.html) resource types. ## Fetch, tail, and filter Lambda function logs To simplify troubleshooting, SAM CLI has a command called `sam logs`. `sam logs` lets you fetch logs generated by your deployed Lambda function from the command line. In addition to printing the logs on the terminal, this command has several nifty features to help you quickly find the bug. You can find more information and examples about filtering Lambda function logs in the [SAM CLI Documentation](https://docs.aws.amazon.com/serverless-application-model/latest/developerguide/serverless-sam-cli-logging.html). ## Cleanup To delete the sample application that you created, use the AWS CLI. Assuming you used your project name for the stack name, you can run the following: ```bash aws cloudformation delete-stack --stack-name LambdaTest ``` ## Resources See the [AWS SAM developer guide](https://docs.aws.amazon.com/serverless-application-model/latest/developerguide/what-is-sam.html) for an introduction to SAM specification, the SAM CLI, and serverless application concepts. Next, you can use AWS Serverless Application Repository to deploy ready to use Apps that go beyond hello world samples and learn how authors developed their applications: [AWS Serverless Application Repository main page](https://aws.amazon.com/serverless/serverlessrepo/)