kratos - Use Kratos for building resilient microservices with a Go-based framework

Introduction to Kratos

Kratos is a robust framework for building microservices, designed to help developers efficiently create powerful applications using the Go programming language. Inspired by the Greek mythological game "God of War," Kratos aims to provide comprehensive tools and features for developing scalable and maintainable software systems.

Key Features

Kratos stands out due to its versatile and robust features that facilitate the development of bulletproof applications:

Communication Protocols: Kratos makes use of HTTP/gRPC protocols, defined using Protobuf, which ensures streamlined communication within applications.
Transport Layer Abstraction: It provides support for both HTTP and gRPC, offering flexibility in how services interact.
Middleware Design: Kratos includes powerful middleware options such as tracing with OpenTelemetry, metrics with Prometheus, recovery mechanisms, and more, enhancing the functionality and reliability of services.
Registry Interface: The framework supports integration with various centralized registries via plugins, ensuring seamless service registry and discovery.
Logging Interface: Easy integration of third-party logging libraries, with support for Fluentd log aggregation, makes managing logs effective and straightforward.
Content Encoding: Kratos automatically handles content encoding based on Accept and Content-Type headers, optimizing data handling.
Configuration Management: Supports multiple data sources and dynamic configurations using atomic operations, simplifying configuration management.
Metadata Transfer: Provides a consistent method for metadata transfer in both HTTP and gRPC protocols, standardizing data exchange.
Error Management: Allows error definitions in Protobuf and the generation of enums using protoc-gen-go, aiding clear and consistent error handling.
Validation Rules: Developers can define validation rules in Protobuf that are compatible with both HTTP and gRPC services.
Swagger API: Automatically generates Swagger API documentation and supports embedding a Swagger UI for easy API exploration.

Learning Kratos

Kratos provides extensive documentation and a comprehensive example library, making it easy for newcomers to get started with the framework. Additionally, it offers a modern template to reduce the setup time for new projects.

Goals

The primary objective of Kratos is to enhance developer productivity. By integrating advanced resources and support, it helps developers navigate the complexities of distributed systems and software engineering, allowing them to focus more on business logic rather than underlying technical challenges. It also serves as a valuable educational resource for developers looking to gain microservices expertise.

Principles

Kratos adheres to several principles to ensure it meets high standards:

Simple: Focuses on simplicity in design and code.
General: Broadly applicable to numerous business development needs.
Highly Efficient: Improves business performance through efficient processes.
Stable: Features tested in production environments for reliability.
Robust: Ensures high quality and minimizes errors.
High Performance: Optimizes performance without unsafe optimizations.
Expandable: Designs interfaces for utilities and base libraries to meet evolving needs.
Fault-Tolerant: Enhances robustness by preparing against failure.
Toolchain: Offers tools for cache generation, linting, and more.

Getting Started

To set up a Kratos playground, developers can utilize Docker with the following steps:

docker run -it --rm -p 8000:8000 --workdir /workspace golang

apt-get update && apt-get -y install protobuf-compiler
export GOPROXY=https://goproxy.io,direct
go install github.com/go-kratos/kratos/cmd/kratos/v2@latest && kratos upgrade

kratos new helloworld
cd helloworld/ && go mod tidy
kratos run

These commands will set up and run a basic Kratos application, accessible at http://localhost:8000/helloworld/kratos.

Community and Contributions

Kratos is supported by a vibrant community with active groups on WeChat and Discord. Contributions to the framework are welcome, with guidelines available in the documentation.

Kratos continues to evolve under the MIT license, integrating influences from projects such as go-kit/kit, go-micro, go-cloud, go-zero, and beego.

For further information and to explore Kratos's capabilities, users are encouraged to delve into the project's comprehensive documentation and community resources.