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# Micro [](https://opensource.org/licenses/Apache-2.0) [](https://pkg.go.dev/go.unistack.org/micro/v4?tab=overview) [](https://github.com/unistack-org/micro/actions?query=workflow%3Abuild+branch%3Amaster+event%3Apush) [](https://goreportcard.com/report/go.unistack.org/micro/v4) [](https://codecov.io/gh/unistack-org/micro)
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Micro is a standard library for microservices.
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## Overview
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Micro provides the core requirements for distributed systems development including RPC and Event driven communication.
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## Features
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Micro abstracts away the details of distributed systems. Here are the main features.
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- **Authentication** - Auth is built in as a first class citizen. Authentication and authorization enable secure
zero trust networking by providing every service an identity and certificates. This additionally includes rule
based access control.
- **Dynamic Config** - Load and hot reload dynamic config from anywhere. The config interface provides a way to load application
level config from any source such as env vars, file, etcd. You can merge the sources and even define fallbacks.
- **Data Storage** - A simple data store interface to read, write and delete records. It includes support for memory, file and
CockroachDB by default. State and persistence becomes a core requirement beyond prototyping and Micro looks to build that into the framework.
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- **Service Discovery** - Automatic service registration and name resolution. Service discovery is at the core of micro service
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development. When service A needs to speak to service B it needs the location of that service.
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- **Load Balancing** - Client side load balancing built on service discovery. Once we have the addresses of any number of instances
of a service we now need a way to decide which node to route to. We use random hashed load balancing to provide even distribution
across the services and retry a different node if there's a problem.
- **Message Encoding** - Dynamic message encoding based on content-type. The client and server will use codecs along with content-type
to seamlessly encode and decode Go types for you. Any variety of messages could be encoded and sent from different clients. The client
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and server handle this by default.
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- **Transport** - gRPC or http based request/response with support for bidirectional streaming. We provide an abstraction for synchronous communication. A request made to a service will be automatically resolved, load balanced, dialled and streamed.
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- **Async Messaging** - PubSub is built in as a first class citizen for asynchronous communication and event driven architectures.
Event notifications are a core pattern in micro service development.
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- **Synchronization** - Distributed systems are often built in an eventually consistent manner. Support for distributed locking and
leadership are built in as a Sync interface. When using an eventually consistent database or scheduling use the Sync interface.
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- **Pluggable Interfaces** - Micro makes use of Go interfaces for each system abstraction. Because of this these interfaces
are pluggable and allows Micro to be runtime agnostic.
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## Getting Started
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To be created.
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## License
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Micro is Apache 2.0 licensed.
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