do not panic during chunk dispatching if consumer suddenly closed (#393)

* do not panic during chunk dispatching if consumer suddenly closed

---------

Co-authored-by: Richard Sugg <richard.sugg@sas.com>
Co-authored-by: Gabriele Santomaggio <G.santomaggio@gmail.com>

Author: 3 people

pkg/stream/server_frame.go

@@ -3,11 +3,12 @@ package stream
 import (
 	"bufio"
 	"bytes"
-	"github.com/rabbitmq/rabbitmq-stream-go-client/pkg/amqp"
-	"github.com/rabbitmq/rabbitmq-stream-go-client/pkg/logs"
 	"hash/crc32"
 	"io"
 	"time"
+
+	"github.com/rabbitmq/rabbitmq-stream-go-client/pkg/amqp"
+	"github.com/rabbitmq/rabbitmq-stream-go-client/pkg/logs"
 )
 
 type ReaderProtocol struct {
@@ -281,7 +282,6 @@ func (c *Client) queryPublisherSequenceFrameHandler(readProtocol *ReaderProtocol
 	res.data <- sequence
 }
 func (c *Client) handleDeliver(r *bufio.Reader) {
-
 	subscriptionId := readByte(r)
 	consumer, err := c.coordinator.GetConsumerById(subscriptionId)
 	consumerFound := err == nil
@@ -407,7 +407,13 @@ func (c *Client) handleDeliver(r *bufio.Reader) {
 	// dispatch the messages with offset to the consumer
 	chunk.offsetMessages = batchConsumingMessages
 	if consumer.getStatus() == open {
-		consumer.chunkForConsumer <- chunk
+		select {
+		case consumer.chunkForConsumer <- chunk:
+		default:
+			logs.LogDebug("The consumer %s for the stream %s reports as open but is probably "+
+				"closed during chunk dispatching. Messages won't be dispatched. ",
+				consumer.GetName(), consumer.GetStreamName())
+		}
 	} else {
 		logs.LogDebug("The consumer %s for the stream %s is closed during the chunk dispatching. "+
 			"Messages won't dispatched", consumer.GetName(), consumer.GetStreamName())