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Add GetNextPublishSeqNo for channel in confirm mode #23

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Oct 25, 2021
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9 changes: 9 additions & 0 deletions channel.go
Original file line number Diff line number Diff line change
Expand Up @@ -1597,3 +1597,12 @@ func (ch *Channel) Reject(tag uint64, requeue bool) error {
Requeue: requeue,
})
}

// GetNextPublishSeqNo returns the sequence number of the next message to be
// published, when in confirm mode.
func (ch *Channel) GetNextPublishSeqNo() uint64 {
ch.confirms.m.Lock()
defer ch.confirms.m.Unlock()

return ch.confirms.published + 1
}
32 changes: 32 additions & 0 deletions integration_test.go
Original file line number Diff line number Diff line change
Expand Up @@ -1776,6 +1776,38 @@ func TestConcurrentChannelAndConnectionClose(t *testing.T) {
}
}

func TestIntegrationGetNextPublishSeqNo(t *testing.T) {
if c := integrationConnection(t, "GetNextPublishSeqNo"); c != nil {
defer c.Close()

ch, err := c.Channel()
if err != nil {
t.Fatalf("channel: %v", err)
}

if err = ch.Confirm(false); err != nil {
t.Fatalf("could not confirm")
}

ex := "test-get-next-pub"
if err = ch.ExchangeDeclare(ex, "direct", false, false, false, false, nil); err != nil {
t.Fatalf("cannot declare %v: got: %v", ex, err)
}

n := ch.GetNextPublishSeqNo()
if n != 1 {
t.Errorf("wrong next publish seqence number before any publish, expected: %d, got: %d", 1, n)
}

ch.Publish("test-get-next-pub-seq", "", false, false, Publishing{})

n = ch.GetNextPublishSeqNo()
if n != 2 {
t.Errorf("wrong next publish seqence number after 1 publishing, expected: %d, got: %d", 2, n)
}
}
}

/*
* Support for integration tests
*/
Expand Down