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go-micro/function.go

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package micro
import (
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"context"
"time"
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"github.com/micro/go-micro/server"
)
type function struct {
cancel context.CancelFunc
Service
}
func fnHandlerWrapper(f Function) server.HandlerWrapper {
return func(h server.HandlerFunc) server.HandlerFunc {
return func(ctx context.Context, req server.Request, rsp interface{}) error {
defer f.Done()
return h(ctx, req, rsp)
}
}
}
func fnSubWrapper(f Function) server.SubscriberWrapper {
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()
return s(ctx, msg)
}
}
}
func newFunction(opts ...Option) Function {
ctx, cancel := context.WithCancel(context.Background())
// force ttl/interval
fopts := []Option{
RegisterTTL(time.Minute),
RegisterInterval(time.Second * 30),
}
// prepend to opts
fopts = append(fopts, opts...)
// make context the last thing
fopts = append(fopts, Context(ctx))
service := newService(fopts...)
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fn := &function{
cancel: cancel,
Service: service,
}
service.Server().Init(
// ensure the service waits for requests to finish
server.Wait(nil),
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// wrap handlers and subscribers to finish execution
server.WrapHandler(fnHandlerWrapper(fn)),
server.WrapSubscriber(fnSubWrapper(fn)),
)
return fn
}
func (f *function) Done() error {
f.cancel()
return nil
}
func (f *function) Handle(v interface{}) error {
return f.Service.Server().Handle(
f.Service.Server().NewHandler(v),
)
}
func (f *function) Subscribe(topic string, v interface{}) error {
return f.Service.Server().Subscribe(
f.Service.Server().NewSubscriber(topic, v),
)
}