micro: rewrite options to support multiple building blocks

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

micro.go

@@ -1,119 +0,0 @@
-// Package micro is a pluggable framework for microservices
-package micro
-
-import (
-	"context"
-
-	"github.com/unistack-org/micro/v3/broker"
-	"github.com/unistack-org/micro/v3/client"
-	"github.com/unistack-org/micro/v3/server"
-)
-
-type serviceKey struct{}
-
-// Service is an interface that wraps the lower level libraries
-// within micro. Its a convenience method for building
-// and initialising services.
-type Service interface {
-	// The service name
-	Name() string
-	// Init initialises options
-	Init(...Option) error
-	// 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
-	// Broker is for broker usage
-	Broker() broker.Broker
-	// Run the service
-	Run() error
-	// The service implementation
-	String() string
-}
-
-// Function is a one time executing Service
-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
-}
-
-/*
-// Type Event is a future type for acting on asynchronous events
-type Event interface {
-	// Publish publishes a message to the event topic
-	Publish(ctx context.Context, msg interface{}, opts ...client.PublishOption) error
-	// Subscribe to the event
-	Subscribe(ctx context.Context, v in
-}
-
-// Resource is a future type for defining dependencies
-type Resource interface {
-	// Name of the resource
-	Name() string
-	// Type of resource
-	Type() string
-	// Method of creation
-	Create() error
-}
-*/
-
-// Event is used to publish messages to a topic
-type Event interface {
-	// Publish publishes a message to the event topic
-	Publish(ctx context.Context, msg interface{}, opts ...client.PublishOption) error
-}
-
-var (
-	// HeaderPrefix for all headers passed
-	HeaderPrefix = "Micro-"
-)
-
-// NewService creates and returns a new Service based on the packages within.
-func NewService(opts ...Option) Service {
-	return newService(opts...)
-}
-
-// FromContext retrieves a Service from the Context.
-func FromContext(ctx context.Context) (Service, bool) {
-	if ctx == nil {
-		return nil, false
-	}
-	s, ok := ctx.Value(serviceKey{}).(Service)
-	return s, ok
-}
-
-// NewContext returns a new Context with the Service embedded within it.
-func NewContext(ctx context.Context, s Service) context.Context {
-	if ctx == nil {
-		ctx = context.Background()
-	}
-	return context.WithValue(ctx, serviceKey{}, s)
-}
-
-// NewFunction returns a new Function for a one time executing Service
-func NewFunction(opts ...Option) Function {
-	return newFunction(opts...)
-}
-
-// NewEvent creates a new event publisher
-func NewEvent(topic string, c client.Client) Event {
-	return &event{c, topic}
-}
-
-// RegisterHandler is syntactic sugar for registering a handler
-func RegisterHandler(s server.Server, h interface{}, opts ...server.HandlerOption) error {
-	return s.Handle(s.NewHandler(h, opts...))
-}
-
-// RegisterSubscriber is syntactic sugar for registering a subscriber
-func RegisterSubscriber(topic string, s server.Server, h interface{}, opts ...server.SubscriberOption) error {
-	return s.Subscribe(s.NewSubscriber(topic, h, opts...))
-}