Go Micro License Go.Dev reference Travis CI Go Report Card

Go Micro is a framework for distributed systems development.


Go Micro provides the core requirements for distributed systems development including RPC and Event driven communication. The Micro philosophy is sane defaults with a pluggable architecture. We provide defaults to get you started quickly but everything can be easily swapped out.


Go Micro abstracts away the details of distributed systems. Here are the main features.

  • 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.

  • Service Discovery - Automatic service registration and name resolution. Service discovery is at the core of micro service development. When service A needs to speak to service B it needs the location of that service. The default discovery mechanism is multicast DNS (mdns), a zeroconf system.

  • 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 and server handle this by default. This includes protobuf and json by default.

  • gRPC Transport - gRPC 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.

  • 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. The default messaging system is a HTTP event message broker.

  • 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.

  • Pluggable Interfaces - Go Micro makes use of Go interfaces for each distributed system abstraction. Because of this these interfaces are pluggable and allows Go Micro to be runtime agnostic. You can plugin any underlying technology. Find plugins in

Getting Started

To make use of Go Micro

import ""

// create a new service
service := micro.NewService(

// initialise flags

// start the service

See the docs for detailed information on the architecture, installation and use of go-micro.


Go Micro is Apache 2.0 licensed.

Expand ▾ Collapse ▴



Package micro is a pluggable framework for microservices



This section is empty.


View Source
var (
	HeaderPrefix = "Micro-"


func NewContext

func NewContext(ctx context.Context, s Service) context.Context

NewContext returns a new Context with the Service embedded within it.

func RegisterHandler

func RegisterHandler(s server.Server, h interface{}, opts ...server.HandlerOption) error

RegisterHandler is syntactic sugar for registering a handler

func RegisterSubscriber

func RegisterSubscriber(topic string, s server.Server, h interface{}, opts ...server.SubscriberOption) error

RegisterSubscriber is syntactic sugar for registering a subscriber


type Event

type Event interface {
	// Publish publishes a message to the event topic
	Publish(ctx context.Context, msg interface{}, opts ...client.PublishOption) error

Event is used to publish messages to a topic

func NewEvent

func NewEvent(topic string, c client.Client) Event

NewEvent creates a new event publisher

func NewPublisher

func NewPublisher(topic string, c client.Client) Event

Deprecated: NewPublisher returns a new Publisher

type Function

type Function interface {
	// Inherits Service interface
	// Done signals to complete execution
	Done() error
	// Handle registers an RPC handler
	Handle(v interface{}) error
	// Subscribe registers a subscriber
	Subscribe(topic string, v interface{}) error

Function is a one time executing Service

func NewFunction

func NewFunction(opts ...Option) Function

NewFunction returns a new Function for a one time executing Service

type Option

type Option func(*Options)

func Action

func Action(a func(*cli.Context) error) Option

Action can be used to parse user provided cli options

func Address

func Address(addr string) Option

Address sets the address of the server

func AfterStart

func AfterStart(fn func() error) Option

AfterStart run funcs after service starts

func AfterStop

func AfterStop(fn func() error) Option

AfterStop run funcs after service stops

func Auth

func Auth(a auth.Auth) Option

Auth sets the auth for the service

func BeforeStart

func BeforeStart(fn func() error) Option

BeforeStart run funcs before service starts

func BeforeStop

func BeforeStop(fn func() error) Option

BeforeStop run funcs before service stops

func Broker

func Broker(b broker.Broker) Option

Broker to be used for service

func Client

func Client(c client.Client) Option

Client to be used for service

func Cmd

func Cmd(c cmd.Cmd) Option

func Config

func Config(c config.Config) Option

Config sets the config for the service

func Context

func Context(ctx context.Context) Option

Context specifies a context for the service. Can be used to signal shutdown of the service and for extra option values.

func Flags

func Flags(flags ...cli.Flag) Option

Flags that can be passed to service

func HandleSignal

func HandleSignal(b bool) Option

HandleSignal toggles automatic installation of the signal handler that traps TERM, INT, and QUIT. Users of this feature to disable the signal handler, should control liveness of the service through the context.

func Metadata

func Metadata(md map[string]string) Option

Metadata associated with the service

func Name

func Name(n string) Option

Name of the service

func Profile

func Profile(p profile.Profile) Option

Profile to be used for debug profile

func RegisterInterval

func RegisterInterval(t time.Duration) Option

RegisterInterval specifies the interval on which to re-register

func RegisterTTL

func RegisterTTL(t time.Duration) Option

RegisterTTL specifies the TTL to use when registering the service

func Registry

func Registry(r registry.Registry) Option

Registry sets the registry for the service and the underlying components

func Runtime

func Runtime(r runtime.Runtime) Option

Runtime sets the runtime

func Selector

func Selector(s selector.Selector) Option

Selector sets the selector for the service client

func Server

func Server(s server.Server) Option

Server to be used for service

func Store

func Store(s store.Store) Option

Store sets the store to use

func Tracer

func Tracer(t trace.Tracer) Option

Tracer sets the tracer for the service

func Transport

func Transport(t transport.Transport) Option

Transport sets the transport for the service and the underlying components

func Version

func Version(v string) Option

Version of the service

func WrapCall

func WrapCall(w ...client.CallWrapper) Option

WrapCall is a convenience method for wrapping a Client CallFunc

func WrapClient

func WrapClient(w ...client.Wrapper) Option

WrapClient is a convenience method for wrapping a Client with some middleware component. A list of wrappers can be provided. Wrappers are applied in reverse order so the last is executed first.

func WrapHandler

func WrapHandler(w ...server.HandlerWrapper) Option

WrapHandler adds a handler Wrapper to a list of options passed into the server

func WrapSubscriber

func WrapSubscriber(w ...server.SubscriberWrapper) Option

WrapSubscriber adds a subscriber Wrapper to a list of options passed into the server

type Options

type Options struct {
	Auth      auth.Auth
	Broker    broker.Broker
	Cmd       cmd.Cmd
	Config    config.Config
	Client    client.Client
	Server    server.Server
	Store     store.Store
	Registry  registry.Registry
	Runtime   runtime.Runtime
	Transport transport.Transport
	Profile   profile.Profile

	// Before and After funcs
	BeforeStart []func() error
	BeforeStop  []func() error
	AfterStart  []func() error
	AfterStop   []func() error

	// Other options for implementations of the interface
	// can be stored in a context
	Context context.Context

	Signal bool

Options for micro service

type Publisher

type Publisher = Event

Type alias to satisfy the deprecation

type Service

type Service interface {
	// The service name
	Name() string
	// Init initialises options
	// Options returns the current options
	Options() Options
	// Client is used to call services
	Client() client.Client
	// Server is for handling requests and events
	Server() server.Server
	// Run the service
	Run() error
	// The service implementation
	String() string

Service is an interface that wraps the lower level libraries within go-micro. Its a convenience method for building and initialising services.

func FromContext

func FromContext(ctx context.Context) (Service, bool)

FromContext retrieves a Service from the Context.

func NewService

func NewService(opts ...Option) Service

NewService creates and returns a new Service based on the packages within.


Path Synopsis
agent Package agent provides an interface for building robots
agent/command Package command is an interface for defining bot commands
agent/input Package input is an interface for bot inputs
api/handler Package handler provides http handlers
api/handler/api Package api provides an http-rpc handler which provides the entire http request over rpc
api/handler/event Package event provides a handler which publishes an event
api/handler/http Package http is a http reverse proxy handler
api/handler/rpc Package rpc is a go-micro rpc handler.
api/handler/web Package web contains the web handler including websocket support
api/resolver Package resolver resolves a http request to an endpoint
api/resolver/grpc Package grpc resolves a grpc service like /greeter.Say/Hello to greeter service
api/resolver/host Package host resolves using http host
api/resolver/path Package path resolves using http path
api/resolver/vpath Package vpath resolves using http path and recognised versioned urls
api/router Package router provides api service routing
api/router/registry Package registry provides a dynamic api service router
api/server Package server provides an API gateway server which handles inbound requests
api/server/acme Package acme abstracts away various ACME libraries
api/server/acme/autocert Package autocert is the ACME provider from This provider does not take any config.
api/server/acme/certmagic Package certmagic is the ACME provider from
api/server/http Package http provides a http server with features; acme, cors, etc
auth Package auth provides authentication and authorization capability
auth/provider Package provider is an external auth provider e.g oauth
broker Package broker is an interface used for asynchronous messaging Package http provides a http based message broker
broker/http Package http provides a http based message broker
broker/memory Package memory provides a memory broker
broker/nats Package nats provides a NATS broker
broker/service Package service provides the broker service client
client Package client is an interface for an RPC client
client/grpc Package grpc provides a gRPC client Package grpc provides a gRPC options
client/mucp Package mucp provides an mucp client
client/selector Package selector is a way to pick a list of service nodes
client/selector/dns Package dns provides a dns SRV selector
client/selector/registry Package registry uses the go-micro registry for selection
client/selector/router Package router is a network/router selector
client/selector/static Package static provides a static resolver which returns the name/ip passed in without any change
codec Package codec is an interface for encoding messages
codec/bytes Package bytes provides a bytes codec which does not encode or decode anything
codec/grpc Package grpc provides a grpc codec
codec/json Package json provides a json codec
codec/jsonrpc Package jsonrpc provides a json-rpc 1.0 codec
codec/proto Package proto provides a proto codec
codec/protorpc Protorpc provides a net/rpc proto-rpc codec.
codec/text Package text reads any text/* content-type
config Package config is an interface for dynamic configuration.
config/cmd Package cmd is an interface for parsing the command line
config/encoder Package encoder handles source encoding formats
config/loader package loader manages loading from multiple sources
config/reader Package reader parses change sets and provides config values
config/secrets Package secrets is an interface for encrypting and decrypting secrets
config/secrets/box Package box is an asymmetric implementation of config/secrets using nacl/box
config/secrets/secretbox Package secretbox is a config/secrets implementation that uses nacl/secretbox to do symmetric encryption / verification
config/source Package source is the interface for sources
config/source/file Package file is a file source.
config/source/memory Package memory is a memory source
debug Package debug provides micro debug packages
debug/log Package log provides debug logging
debug/log/kubernetes Package kubernetes is a logger implementing (
debug/log/memory Package memory provides an in memory log buffer
debug/profile Package profile is for profilers
debug/profile/http Package http enables the http profiler
debug/profile/pprof Package pprof provides a pprof profiler
debug/service Package service provides the service log
debug/service/handler Package handler implements service debug handler embedded in go-micro services
debug/stats Package stats provides runtime stats
debug/trace Package trace provides an interface for distributed tracing
errors Package errors provides a way to return detailed information for an RPC request error.
logger Package log provides a log interface
metadata Package metadata is a way of defining message headers
network Package network is for creating internetworks
network/resolver Package resolver resolves network names to addresses
network/resolver/dns Package dns resolves names to dns records
network/resolver/dnssrv Package dns srv resolves names to dns srv records
network/resolver/http Package http resolves names to network addresses using a http request
network/resolver/registry Package registry resolves names using the go-micro registry
network/resolver/static Package static is a static resolver
plugin Package plugin provides the ability to load plugins Package plugin provides the ability to load plugins
proxy Package proxy is a transparent proxy built on the go-micro/server Package proxy is a transparent proxy built on the go-micro/server
proxy/grpc Package grpc transparently forwards the grpc protocol using a go-micro client.
proxy/http Package http provides a micro rpc to http proxy
proxy/mucp Package mucp transparently forwards the incoming request using a go-micro client.
registry Package mdns is a multicast dns registry Package registry is an interface for service discovery
registry/cache Package cache provides a registry cache
registry/etcd Package etcd provides an etcd service registry
registry/mdns Package mdns provides a multicast dns registry
registry/memory Package memory provides an in-memory registry
registry/service Package service uses the registry service
router Package router provides a network routing control plane
runtime Package runtime is a service runtime manager
runtime/kubernetes Package kubernetes implements kubernetes micro runtime Package kubernetes taken from There are some modifications compared to the other files as this package doesn't provide write functionality.
runtime/local Package local provides a local runtime
runtime/local/build Package build builds a micro runtime package
runtime/local/build/docker Package docker builds docker images
runtime/local/build/go Package golang is a go package manager
runtime/local/process Package process executes a binary
runtime/local/process/os Package os runs processes locally Package os runs processes locally
runtime/local/source Package source retrieves source code
runtime/local/source/git Package git provides a git source
runtime/local/source/go Package golang is a source for Go
server Package server is an interface for a micro server
server/grpc Package grpc provides a grpc server
server/mucp Package mucp provides an mucp server
service Package service encapsulates the client, server and other interfaces to provide a complete micro service.
service/mucp Package mucp initialises a mucp service
store Package store is an interface for distributed data storage.
store/cache Package cache implements a faulting style read cache on top of multiple micro stores
store/cockroach Package cockroach implements the cockroach store
store/file Package local is a file system backed store
store/memory Package memory is a in-memory store store
store/service Package service implements the store service interface
sync Package sync is an interface for distributed synchronization
sync/etcd Package etcd is an etcd implementation of lock
sync/memory Package memory provides a sync.Mutex implementation of the lock for local use
transport Package transport is an interface for synchronous connection based communication
transport/grpc Package grpc provides a grpc transport
transport/http Package http returns a http2 transport using net/http
transport/memory Package memory is an in-memory transport
transport/quic Package quic provides a QUIC based transport
tunnel Package tunnel provides gre network tunnelling
tunnel/broker Package broker is a tunnel broker
tunnel/transport Package transport provides a tunnel transport
util/backoff Package backoff provides backoff functionality
util/io Package io is for io management
util/jitter Package jitter provides a random jitter
util/kubernetes/client Package client provides an implementation of a restricted subset of kubernetes API client
util/log Package log is a global internal logger DEPRECATED: this is frozen package, use
util/mux Package mux provides proxy muxing
util/pki Package pki provides PKI all the PKI functions necessary to run micro over an untrusted network including a CA
util/pool Package pool is a connection pool
util/proto Package proto contains utility functions for working with protobufs
util/qson Package qson implmenets decoding of URL query params into JSON and Go values (using JSON struct tags).
util/ring Package ring provides a simple ring buffer for storing local data
util/socket Package socket provides a pseudo socket
util/stream Package stream encapsulates streams within streams
util/sync Package syncs will sync multiple stores
web Package web provides web based micro services