Chapter 1, Introduction to Microservices, introduces you to microservices and how they can be created with Rust. In this chapter, we also discuss the benefits of using Rust for creating microservices.
Chapter 2, Developing a Microservice with Hyper Crate, describes how to create microservices with the hyper crate, thereby allowing us to create a compact asynchronous web server with precise control over incoming requests (method, path, query parameters, and so on).
Chapter 3, Logging and Configuring Microservices, includes information about configuring a microservice using command-line arguments, environment variables, and configuration files. You will also see how to add logging to your projects, since this is the most important feature for the maintenance of microservices in production.
Chapter 4, Data Serialization and Deserialization with Serde Crate, explains how, in addition to customary HTTP requests, your microservice has to support formal requests and responses in a specific format, such as JSON, and CBOR, which is important for API implementation and in terms of organizing the mutual interaction of microservices.
Chapter 5, Understanding Asynchronous Operations with Futures Crate, delves into the deeper asynchronous concepts of Rust and how to use asynchronous primitives for writing combinators to process a request and prepare a response for a client. Without a clear understanding of these concepts, you cannot write effective microservices to utilize all available resources of a server, and to avoid the blocking of threads that execute asynchronous activities and require special treatment with execution runtime.
Chapter 6, Reactive Microservices – Increasing Capacity and Performance, introduces you to a reactive microservice that won't respond immediately to incoming requests, and that takes time to process a request and response when it's done. You will become familiar with remote procedure calls in Rust and how to use the language so that microservices can call one another.
Chapter 7, Reliable Integration with Databases, shows you how to interact with databases using Rust. You will get to know crates that provide interaction with databases, including MySQL, PostgreSQL, Redis, MongoDB, and DynamoDB.
Chapter 8, Interaction to Database with Object-Relational Mapping, explains how, in order to interact with SQL databases effectively and map database records to native Rust structs, you can use object-relational mapping (ORM). This chapter demonstrates how to use diesel crates which require nightly compiler version and whose capabilities are used for generating bindings with tables.
Chapter 9, Simple REST Definition and Request Routing with Frameworks, explains how, in certain cases, you don't need to write stringent asynchronous code, and that it is sufficient to use frameworks that simplify microservice writing. In this chapter, you will become acquainted with four such frameworks—rouille, nickel, rocket, and gotham.
Chapter 10, Background Tasks and Thread Pools in Microservices, discusses multithreading in microservices and how to use pools of threads to perform tasks on a background, given that not every task can be performed asynchronously and requires a high CPU load.
Chapter 11, Involving Concurrency with Actors and Actix Crate, introduces you to the Actix framework, which uses the actor's model to provide you with abstractions that are easily compatible with Rust. This includes the balance of performance, the readability of the code, and task separation.
Chapter 12, Scalable Microservices Architecture, delves into an explanation of how to design loose-coupling microservices that don't need to know about sibling microservices, and that use message queues and brokers to interact with one another. We will write an example of how to interact with other microservices using RabbitMQ.
Chapter 13, Testing and Debugging Rust Microservices, explains how testing and debugging is a key component in terms of preparing for the release of microservices. You will learn how to test microservices from unit tests to cover a full application with integration tests. Afterward, we will then discuss how to debug an application using debuggers and logging capabilities. Also, we will create an example that uses distributed tracing based on the OpenTrace API – a modern tool for tracking the activities of complex applications.
Chapter 14, Optimization of Microservices, describes how to optimize a microservice and extract the maximum performance possible.
Chapter 15, Packing Servers to Containers, explains how, when a microservice is ready for release, there should be a focus on packing microservices to containers, because at least some microservices require additional data and environments to work, or even just to gain the advantage of fast delivery containers over bare binaries.
Chapter 16, DevOps of Rust Microservices - Continuous Integration and Delivery, continues with the theme of learning how to build microservices and explains how to use continuous integration to automate building and delivery processes for your product.
 Chapter 17, Bounded Microservices with AWS Lambda, introduces you to serverless architecture, an alternative approach to writing services. You will become acquainted with AWS Lambda and you can use Rust to write fast functions that work as a part of serverless applications. Also, we will use the Serverless Framework to build and deploy the example application to the AWS infrastructure in a fully automated manner.
