micro

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v0.23.0 Latest Latest Go to latest Published: Jan 29, 2019 License: Apache-2.0 Imports: 15 Imported by: 0

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README ¶

Go Micro

Go Micro is a framework for micro service 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.

Plugins are available at github.com/micro/go-plugins.

Follow us on Twitter or join the Slack community.

Features

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

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. You can optionally set gossip using the SWIM protocol for p2p networks or consul for a resilient cloud-native setup.
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.
Sync Streaming - 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. The default transport is http/1.1 or http2 when tls is enabled.
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 is point-to-point http/1.1 or http2 when tls is enabled.
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 github.com/micro/go-plugins.

Getting Started

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

Documentation ¶

Overview ¶

Package micro is a pluggable framework for microservices

Index ¶

Variables
func NewContext(ctx context.Context, s Service) context.Context
func RegisterHandler(s server.Server, h interface{}, opts ...server.HandlerOption) error
func RegisterSubscriber(topic string, s server.Server, h interface{}, opts ...server.SubscriberOption) error
type Function
- func NewFunction(opts ...Option) Function
type Option
type Options
type Publisher
- func NewPublisher(topic string, c client.Client) Publisher
type Service
- func FromContext(ctx context.Context) (Service, bool)
- func NewService(opts ...Option) Service

Constants ¶

This section is empty.

Variables ¶

View Source

var (
	HeaderPrefix = "Micro-"
)

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 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)) Option

func AfterStart ¶

func AfterStart(fn func() error) Option

func AfterStop ¶

func AfterStop(fn func() error) Option

func BeforeStart ¶

func BeforeStart(fn func() error) Option

func BeforeStop ¶

func BeforeStop(fn func() error) Option

func Broker ¶

func Broker(b broker.Broker) Option

func Client ¶

func Client(c client.Client) Option

func Cmd ¶

func Cmd(c cmd.Cmd) Option

func Context ¶

func Context(ctx context.Context) Option

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

func Flags ¶

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

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 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 Selector ¶ added in v0.3.0

func Selector(s selector.Selector) Option

Selector sets the selector for the service client

func Server ¶

func Server(s server.Server) Option

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 {
	Broker    broker.Broker
	Cmd       cmd.Cmd
	Client    client.Client
	Server    server.Server
	Registry  registry.Registry
	Transport transport.Transport

	// 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
}

type Publisher ¶

type Publisher interface {
	Publish(ctx context.Context, msg interface{}, opts ...client.PublishOption) error
}

Publisher is syntactic sugar for publishing

func NewPublisher ¶

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

NewPublisher returns a new Publisher

type Service ¶

type Service interface {
	Init(...Option)
	Options() Options
	Client() client.Client
	Server() server.Server
	Run() error
	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 ¶

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Directories ¶

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Path	Synopsis
broker Package broker is an interface used for asynchronous messaging	Package broker is an interface used for asynchronous messaging
http Package http provides a http based message broker	Package http provides a http based message broker
memory Package memory provides a memory broker	Package memory provides a memory broker
client Package client is an interface for an RPC client	Package client is an interface for an RPC client
mock Package mock provides a mock client for testing	Package mock provides a mock client for testing
rpc Package rpc provides an rpc client	Package rpc provides an rpc client
cmd Package cmd is an interface for parsing the command line	Package cmd is an interface for parsing the command line
codec 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 Package proto is a generated protocol buffer package.	Package proto is a generated protocol buffer package.
config module
errors 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.
metadata Package metadata is a way of defining message headers	Package metadata is a way of defining message headers
registry 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
consul
gossip Package Gossip provides a gossip registry based on hashicorp/memberlist	Package Gossip provides a gossip registry based on hashicorp/memberlist
gossip/proto Package gossip is a generated protocol buffer package.	Package gossip is a generated protocol buffer package.
mdns Package mdns provides a multicast dns registry	Package mdns provides a multicast dns registry
memory Package memory provides an in-memory registry	Package memory provides an in-memory registry
selector Package selector is a way to pick a list of service nodes	Package selector is a way to pick a list of service nodes
dns Package dns provides a dns SRV selector	Package dns provides a dns SRV selector
registry Package registry uses the go-micro registry for selection	Package registry uses the go-micro registry for selection
static Package static provides a static resolver which returns the name/ip passed in without any change	Package static provides a static resolver which returns the name/ip passed in without any change
server Package server is an interface for a micro server	Package server is an interface for a micro server
debug
debug/proto Package debug is a generated protocol buffer package.	Package debug is a generated protocol buffer package.
mock
rpc Package rpc provides an rpc server	Package rpc provides an rpc server
transport Package transport is an interface for synchronous communication	Package transport is an interface for synchronous communication
http Package http returns a http2 transport using net/http	Package http returns a http2 transport using net/http
memory Package memory is an in-memory transport	Package memory is an in-memory transport