دانلود کتاب جاوا اسکریپت در AWS Lambda – نحوه استفاده از Node.js در معماری بدون سرور

The AWS Lambda service supports the Node.js runtime that makes it possible to run Javascript code in the AWS cloud. This book is to teach you how to do it right, starting from the basics of how the Lambda service works through the configuration options and how programming for serverless is different, all to specific tools to help you. By the end of this book, you’ll know the specific aspects of using Javascript on AWS Lambda, the best practices, and the common pitfalls. The structure of the book follows a bottom-up approach. You’ll learn the Lambda environment first, then how to configure Javascript functions. After that, we’ll move on to programming, then debugging. In The Lambda execution model chapter, you’ll learn about the Lambda execution environment. This is the foundation for moving functions to a serverless stack as Lambda works differently than on-server apps in several important aspects. You’ll learn about these differences in this chapter, such as how function instances start, what it means for response time and caching, and how resources are allocated. Then the Setup chapter is how to configure a Javascript Lambda function, such as how to define its code, and how to pass parameters to it. You’ll learn how the Lambda permission model works and the AWS support policy for each Node.js version. Then we’ll move to the body of the serverless function in the Programming model chapter. You’ll learn how to write code for Lambda, how to handle input/output, interface with other AWS resources, and other topics. Then we’ll cover how to fix errors in the Debugging chapter. You’ll learn about Lambda’s peculiar logging model, and how to gain insight into what happens inside the function. You’ll also learn about X-Ray, AWS’s solution for cross-service debugging. Finally, you’ll learn about some common problems and how to solve them in the Other topics chapter. These are specific tools that come up often enough to warrant their own section. The code examples are written in Terraform, and there are links to code repositories for easy experimentation.