micro

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 Go to latest Published: Feb 23, 2022 License: Apache-2.0 Imports: 28 Imported by: 295

README

Go Micro License Go.Dev reference

Go Micro is a framework for distributed systems development.

Overview

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.

Features

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.

  • RPC Client/Server - RPC 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.

Getting Started

To make use of Go Micro

import "github.com/asim/go-micro/v3"

// create a new service
service := micro.NewService(
    micro.Name("helloworld"),
)

// initialise flags
service.Init()

// start the service
service.Run()

See the examples for detailed information on usage.

Command Line Interface

See cmd/gomu for the command line interface.

Code Generation

See cmd/protoc-gen-micro for protobuf code generation.

Example Usage

See examples directory for usage examples.

Plugins

See plugins directory for all the plugins.

Services

See services directory for third party services.

License

Go Micro is Apache 2.0 licensed.

Documentation

Overview

Package micro is a pluggable framework for microservices

Index

Constants

This section is empty.

Variables

This section is empty.

Functions

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

Types

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 deprecated 

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

Deprecated: NewPublisher returns a new Publisher

type Function 

type Function interface {
	// Inherits Service interface
	Service
	// 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 Cache added in v3.7.0 

func Cache(c cache.Cache) Option

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
	Cache     cache.Cache
	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
	Init(...Option)
	// 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.

Source Files

View all Source files

Directories

Path Synopsis
api
handler
Package handler provides http handlers
 Package handler provides http handlers
handler/api
Package api provides an http-rpc handler which provides the entire http request over rpc
 Package api provides an http-rpc handler which provides the entire http request over rpc
handler/event
Package event provides a handler which publishes an event
 Package event provides a handler which publishes an event
handler/http
Package http is a http reverse proxy handler
 Package http is a http reverse proxy handler
handler/rpc
Package rpc is a go-micro rpc handler.
 Package rpc is a go-micro rpc handler.
handler/web
Package web contains the web handler including websocket support
 Package web contains the web handler including websocket support
internal/proto
proto
resolver
Package resolver resolves a http request to an endpoint
 Package resolver resolves a http request to an endpoint
resolver/grpc
Package grpc resolves a grpc service like /greeter.Say/Hello to greeter service
 Package grpc resolves a grpc service like /greeter.Say/Hello to greeter service
resolver/host
Package host resolves using http host
 Package host resolves using http host
resolver/path
Package path resolves using http path
 Package path resolves using http path
resolver/vpath
Package vpath resolves using http path and recognised versioned urls
 Package vpath resolves using http path and recognised versioned urls
router
Package router provides api service routing
 Package router provides api service routing
router/registry
Package registry provides a dynamic api service router
 Package registry provides a dynamic api service router
router/static
router/util
server
Package server provides an API gateway server which handles inbound requests
 Package server provides an API gateway server which handles inbound requests
server/acme
Package acme abstracts away various ACME libraries
 Package acme abstracts away various ACME libraries
server/acme/autocert
Package autocert is the ACME provider from golang.org/x/crypto/acme/autocert This provider does not take any config.
 Package autocert is the ACME provider from golang.org/x/crypto/acme/autocert This provider does not take any config.
server/cors
server/http
Package http provides a http server with features; acme, cors, etc
 Package http provides a http server with features; acme, cors, etc
Package auth provides authentication and authorization capability
 Package auth provides authentication and authorization capability
Package broker is an interface used for asynchronous messaging Package http provides a http based message broker
 Package broker is an interface used for asynchronous messaging Package http provides a http based message broker
Package client is an interface for an RPC client
 Package client is an interface for an RPC client
Package cmd is an interface for parsing the command line
 Package cmd is an interface for parsing the command line
Package codec is an interface for encoding messages
 Package codec is an interface for encoding messages
bytes
Package bytes provides a bytes codec which does not encode or decode anything
 Package bytes provides a bytes codec which does not encode or decode anything
grpc
Package grpc provides a grpc codec
 Package grpc provides a grpc codec
json
Package json provides a json codec
 Package json provides a json codec
jsonrpc
Package jsonrpc provides a json-rpc 1.0 codec
 Package jsonrpc provides a json-rpc 1.0 codec
proto
Package proto provides a proto codec
 Package proto provides a proto codec
protorpc
Protorpc provides a net/rpc proto-rpc codec.
 Protorpc provides a net/rpc proto-rpc codec.
text
Package text reads any text/* content-type
 Package text reads any text/* content-type
Package config is an interface for dynamic configuration.
 Package config is an interface for dynamic configuration.
encoder
Package encoder handles source encoding formats
 Package encoder handles source encoding formats
encoder/json
loader
package loader manages loading from multiple sources
 package loader manages loading from multiple sources
loader/memory
reader
Package reader parses change sets and provides config values
 Package reader parses change sets and provides config values
reader/json
secrets
Package secrets is an interface for encrypting and decrypting secrets
 Package secrets is an interface for encrypting and decrypting secrets
secrets/box
Package box is an asymmetric implementation of config/secrets using nacl/box
 Package box is an asymmetric implementation of config/secrets using nacl/box
secrets/secretbox
Package secretbox is a config/secrets implementation that uses nacl/secretbox to do symmetric encryption / verification
 Package secretbox is a config/secrets implementation that uses nacl/secretbox to do symmetric encryption / verification
source
Package source is the interface for sources
 Package source is the interface for sources
source/cli
source/env
source/file
Package file is a file source.
 Package file is a file source.
source/flag
source/memory
Package memory is a memory source
 Package memory is a memory source
debug
handler
Package handler implements service debug handler embedded in go-micro services
 Package handler implements service debug handler embedded in go-micro services
log
Package log provides debug logging
 Package log provides debug logging
log/memory
Package memory provides an in memory log buffer
 Package memory provides an in memory log buffer
log/noop
profile
Package profile is for profilers
 Package profile is for profilers
profile/http
Package http enables the http profiler
 Package http enables the http profiler
profile/pprof
Package pprof provides a pprof profiler
 Package pprof provides a pprof profiler
proto
stats
Package stats provides runtime stats
 Package stats provides runtime stats
trace
Package trace provides an interface for distributed tracing
 Package trace provides an interface for distributed tracing
Package errors provides a way to return detailed information for an RPC request error.
 Package errors provides a way to return detailed information for an RPC request error.
Package log provides a log interface
 Package log provides a log interface
Package metadata is a way of defining message headers
 Package metadata is a way of defining message headers
Package plugin provides the ability to load plugins
 Package plugin provides the ability to load plugins
Package mdns is a multicast dns registry Package registry is an interface for service discovery
 Package mdns is a multicast dns registry Package registry is an interface for service discovery
cache
Package cache provides a registry cache
 Package cache provides a registry cache
Package runtime is a service runtime manager
 Package runtime is a service runtime manager
kubernetes
Package kubernetes implements kubernetes micro runtime Package kubernetes taken from https://github.com/micro/go-micro/blob/master/debug/log/kubernetes/kubernetes.go There are some modifications compared to the other files as this package doesn't provide write functionality.
 Package kubernetes implements kubernetes micro runtime Package kubernetes taken from https://github.com/micro/go-micro/blob/master/debug/log/kubernetes/kubernetes.go There are some modifications compared to the other files as this package doesn't provide write functionality.
local
Package local provides a local runtime
 Package local provides a local runtime
local/build
Package build builds a micro runtime package
 Package build builds a micro runtime package
local/build/docker
Package docker builds docker images
 Package docker builds docker images
local/build/go
Package golang is a go package manager
 Package golang is a go package manager
local/git
local/process
Package process executes a binary
 Package process executes a binary
local/process/os
Package os runs processes locally Package os runs processes locally
 Package os runs processes locally Package os runs processes locally
local/source
Package source retrieves source code
 Package source retrieves source code
local/source/git
Package git provides a git source
 Package git provides a git source
local/source/go
Package golang is a source for Go
 Package golang is a source for Go
Package selector is a way to pick a list of service nodes
 Package selector is a way to pick a list of service nodes
Package server is an interface for a micro server
 Package server is an interface for a micro server
mock
proto
services
address
answer
cache
crypto
currency
db
email
emoji
evchargers
file
forex
geocoding
gifs
helloworld
holidays
id
image
ip
location
notes
otp
postcode
prayer
qr
quran
routing
rss
sentiment
sms
stock
stream
sunnah
thumbnail
time
twitter
url
user
vehicle
weather
Package store is an interface for distributed data storage.
 Package store is an interface for distributed data storage.
Package sync is an interface for distributed synchronization
 Package sync is an interface for distributed synchronization
Package transport is an interface for synchronous connection based communication
 Package transport is an interface for synchronous connection based communication
util
addr
backoff
Package backoff provides backoff functionality
 Package backoff provides backoff functionality
buf
ctx
file
file/proto
grpc
http
io
Package io is for io management
 Package io is for io management
jitter
Package jitter provides a random jitter
 Package jitter provides a random jitter
kubernetes/api
kubernetes/client
Package client provides an implementation of a restricted subset of kubernetes API client
 Package client provides an implementation of a restricted subset of kubernetes API client
log
Package log is a global internal logger DEPRECATED: this is frozen package, use github.com/asim/go-micro/v3/logger
 Package log is a global internal logger DEPRECATED: this is frozen package, use github.com/asim/go-micro/v3/logger
mdns
net
pki
Package pki provides PKI all the PKI functions necessary to run micro over an untrusted network including a CA
 Package pki provides PKI all the PKI functions necessary to run micro over an untrusted network including a CA
pool
Package pool is a connection pool
 Package pool is a connection pool
qson
Package qson implmenets decoding of URL query params into JSON and Go values (using JSON struct tags).
 Package qson implmenets decoding of URL query params into JSON and Go values (using JSON struct tags).
registry
ring
Package ring provides a simple ring buffer for storing local data
 Package ring provides a simple ring buffer for storing local data
signal
socket
Package socket provides a pseudo socket
 Package socket provides a pseudo socket
stream
Package stream encapsulates streams within streams
 Package stream encapsulates streams within streams
sync
Package syncs will sync multiple stores
 Package syncs will sync multiple stores
test
tls
wrapper
Package web provides web based micro services
 Package web provides web based micro services

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