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vine.go
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vine.go
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// Copyright 2020 lack
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Package vine is a pluggable framework for vine services
package service
import (
"context"
"github.com/lack-io/vine/service/client"
"github.com/lack-io/vine/service/server"
)
type serviceKey struct{}
// Service is an interface that wraps the lower level libraries
// within vine. Its a convenience method for building
// and initialising services.
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
}
// 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
}
// Event is used to publish messages to topic
type Event interface {
// Publish publishes a message to the event topic
Publish(ctx context.Context, msg interface{}, opts ...client.PublishOption) error
}
type Option func(*Options)
var (
HeaderPrefix = "Vine-"
)
// 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) {
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 {
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 pulisher
func NewEvent(topic string, c client.Client) Event {
if c == nil {
c = client.DefaultClient
}
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...))
}