micro

package module

v4.0.0-...-699247e Latest Latest Go to latest Published: Feb 27, 2023 License: Apache-2.0 Imports: 23 Imported by: 0

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github.com/justcy/go-micro

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README ¶

Go Micro

Go Micro is a framework for distributed systems development.

‼️ We are working on go-micro v5 and would love to hear what you'd like to see in it, leave your thoughts in this form

Overview

Go Micro provides the core requirements for distributed systems development including RPC and Event driven communication. The Go 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.
Event Streaming - PubSub is great for async notifications but for more advanced use cases event streaming is preferred. Offering persistent storage, consuming from offsets and acking. Go Micro includes support for NATS Jetstream and Redis streams.
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/justcy/go-micro/v4"

// 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.

Toolkit

See github.com/go-micro for tooling.

Changelog

See CHANGELOG.md for release history.

License

Go Micro is Apache 2.0 licensed.

Documentation ¶

Overview ¶

Package micro is a pluggable framework for microservices

Index ¶

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 Event
- func NewEvent(topic string, c client.Client) Event
type Option
type Options
type Publisher
type Service
- func FromContext(ctx context.Context) (Service, bool)
- func NewService(opts ...Option) Service

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.

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 AddListenOption ¶

func AddListenOption(option server.Option) Option

Add opt to server option.

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 ¶

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 Logger ¶

func Logger(l logger.Logger) Option

Logger sets the logger for the service.

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
	Logger    logger.Logger
	// 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 initializes 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 initializing 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
api Package api is for building api gateways	Package api is for building api gateways
client Package client provides an api client	Package client provides an api client
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 recognized versioned urls	Package vpath resolves using http path and recognized 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
auth Package auth provides authentication and authorization capability	Package auth provides authentication and authorization capability
broker Package broker is an interface used for asynchronous messaging	Package broker is an interface used for asynchronous messaging
cache
client Package client is an interface for an RPC client	Package client is an interface for an RPC client
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 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
config 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
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.
events Package events is for event streaming and storage	Package events is for event streaming and storage
logger Package log provides a log interface	Package log provides a log interface
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 mdns is a multicast dns registry
cache Package cache provides a registry cache	Package cache provides a registry cache
runtime Package runtime is a service runtime manager	Package runtime is a service runtime manager
kubernetes Package kubernetes implements kubernetes micro runtime	Package kubernetes implements kubernetes micro runtime
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
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
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
server Package server is an interface for a micro server	Package server is an interface for a micro server
mock
proto
store Package store is an interface for distributed data storage.	Package store is an interface for distributed data storage.
sync Package sync is an interface for distributed synchronization	Package sync is an interface for distributed synchronization
tests Package tests implements a testing framwork, and provides default tests.	Package tests implements a testing framwork, and provides default tests.
transport Package transport is an interface for synchronous connection based communication	Package transport is an interface for synchronous connection based communication
headers headers is a package for internal micro global constants	headers is a package for internal micro global constants
util
addr addr provides functions to retrieve local IP addresses from device interfaces.	addr provides functions to retrieve local IP addresses from device interfaces.
backoff Package backoff provides backoff functionality	Package backoff provides backoff functionality
buf
cmd Package cmd is an interface for parsing the command line	Package cmd is an interface for parsing the command line
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
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
web Package web provides web based micro services	Package web provides web based micro services