101 lines
2.1 KiB
Go
101 lines
2.1 KiB
Go
// +build ignore
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package micro
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import (
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"context"
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"time"
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"github.com/unistack-org/micro/v3/server"
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)
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// Function is a one time executing Service
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type Function interface {
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// Inherits Service interface
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Service
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// Done signals to complete execution
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Done() error
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// Handle registers an RPC handler
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Handle(v interface{}) error
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// Subscribe registers a subscriber
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Subscribe(topic string, v interface{}) error
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}
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type function struct {
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cancel context.CancelFunc
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Service
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}
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// NewFunction returns a new Function for a one time executing Service
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func NewFunction(opts ...Option) Function {
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return newFunction(opts...)
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}
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func fnHandlerWrapper(f Function) server.HandlerWrapper {
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return func(h server.HandlerFunc) server.HandlerFunc {
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return func(ctx context.Context, req server.Request, rsp interface{}) error {
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defer f.Done()
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return h(ctx, req, rsp)
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}
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}
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}
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func fnSubWrapper(f Function) server.SubscriberWrapper {
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return func(s server.SubscriberFunc) server.SubscriberFunc {
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return func(ctx context.Context, msg server.Message) error {
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defer f.Done()
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return s(ctx, msg)
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}
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}
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}
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func newFunction(opts ...Option) Function {
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ctx, cancel := context.WithCancel(context.Background())
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// force ttl/interval
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fopts := []Option{
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RegisterTTL(time.Minute),
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RegisterInterval(time.Second * 30),
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}
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// prepend to opts
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fopts = append(fopts, opts...)
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// make context the last thing
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fopts = append(fopts, Context(ctx))
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service := &service{opts: NewOptions(fopts...)}
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fn := &function{
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cancel: cancel,
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Service: service,
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}
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service.Server().Init(
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// ensure the service waits for requests to finish
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server.Wait(nil),
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// wrap handlers and subscribers to finish execution
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server.WrapHandler(fnHandlerWrapper(fn)),
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server.WrapSubscriber(fnSubWrapper(fn)),
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)
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return fn
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}
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func (f *function) Done() error {
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f.cancel()
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return nil
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}
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func (f *function) Handle(v interface{}) error {
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return f.Service.Server().Handle(
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f.Service.Server().NewHandler(v),
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)
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}
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func (f *function) Subscribe(topic string, v interface{}) error {
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return f.Service.Server().Subscribe(
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f.Service.Server().NewSubscriber(topic, v),
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)
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}
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