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chan.go
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/
chan.go
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package binding
import (
"context"
"errors"
"io"
)
// ChanSender implements Sender by sending on a channel.
type ChanSender chan<- Message
// ChanReceiver implements Receiver by receiving from a channel.
type ChanReceiver <-chan Message
func (s ChanSender) Send(ctx context.Context, m Message) (err error) {
defer func() {
err2 := m.Finish(err)
if err == nil {
err = err2
}
}()
select {
case <-ctx.Done():
return ctx.Err()
case s <- m:
return nil
}
}
func (s ChanSender) Close(ctx context.Context) (err error) {
defer func() {
if recover() != nil {
err = errors.New("send on closed channel")
}
}()
close(s)
return nil
}
func (r ChanReceiver) Receive(ctx context.Context) (Message, error) {
select {
case <-ctx.Done():
return nil, ctx.Err()
case m, ok := <-r:
if !ok {
return nil, io.EOF
}
return m, nil
}
}
func (r ChanReceiver) Close(ctx context.Context) error { return nil }