micro/function.go
2017-05-31 20:45:36 +01:00

68 lines
1.4 KiB
Go

package micro
import (
"github.com/micro/go-micro/server"
"golang.org/x/net/context"
)
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 {
return func(ctx context.Context, msg server.Publication) error {
defer f.Done()
return s(ctx, msg)
}
}
}
func newFunction(opts ...Option) Function {
ctx, cancel := context.WithCancel(context.Background())
opts = append(opts, Context(ctx))
service := newService(opts...)
fn := &function{
cancel: cancel,
Service: service,
}
service.Server().Init(
// ensure the service waits for requests to finish
server.Wait(true),
// 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),
)
}