handle AMQP server shutdown in protocol's receiver (#750)

Signed-off-by: Oleg Kulyk <[email protected]>

Co-authored-by: Scott Nichols <[email protected]>

protocol/amqp/v2/receiver.go

@@ -8,13 +8,16 @@ package amqp
 import (
 	"context"
 	"io"
+	"strings"
 
 	"github.com/Azure/go-amqp"
 
 	"github.com/cloudevents/sdk-go/v2/binding"
 	"github.com/cloudevents/sdk-go/v2/protocol"
 )
 
+const serverDown = "session ended by server"
+
 // receiver wraps an amqp.Receiver as a binding.Receiver
 type receiver struct{ amqp *amqp.Receiver }
 
@@ -24,6 +27,10 @@ func (r *receiver) Receive(ctx context.Context) (binding.Message, error) {
 		if err == ctx.Err() {
 			return nil, io.EOF
 		}
+		// handle case when server goes down
+		if strings.HasPrefix(err.Error(), serverDown) {
+			return nil, io.EOF
+		}
 		return nil, err
 	}