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requester.go
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/
requester.go
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package gochan
import (
"context"
"errors"
"fmt"
"github.com/cloudevents/sdk-go/v2/binding"
"github.com/cloudevents/sdk-go/v2/protocol"
)
type Requester struct {
Ch chan<- binding.Message
Reply func(message binding.Message) (binding.Message, error)
}
func (s *Requester) Send(ctx context.Context, m binding.Message, transformers ...binding.Transformer) (err error) {
if ctx == nil {
return fmt.Errorf("nil Context")
} else if m == nil {
return fmt.Errorf("nil Message")
}
defer func() {
err2 := m.Finish(err)
if err == nil {
err = err2
}
}()
select {
case <-ctx.Done():
return ctx.Err()
case s.Ch <- m:
return nil
}
}
func (s *Requester) Request(ctx context.Context, m binding.Message, transformers ...binding.Transformer) (res binding.Message, err error) {
defer func() {
err2 := m.Finish(err)
if err == nil {
err = err2
}
}()
select {
case <-ctx.Done():
return nil, ctx.Err()
case s.Ch <- m:
return s.Reply(m)
}
}
func (s *Requester) Close(ctx context.Context) (err error) {
defer func() {
if recover() != nil {
err = errors.New("trying to close a closed Sender")
}
}()
close(s.Ch)
return nil
}
var _ protocol.RequesterCloser = (*Requester)(nil)