// decode from bytes.
// Return bytes decoded or 0 if we could not decode a complete object.
//
func decode(data *C.pn_data_t, bytes []byte) int {
if len(bytes) == 0 {
return 0
}
n := int(C.pn_data_decode(data, cPtr(bytes), cLen(bytes)))
if n == int(C.PN_UNDERFLOW) {
C.pn_error_clear(C.pn_data_error(data))
return 0
} else if n <= 0 {
panic(internal.Errorf("unmarshal %s", internal.PnErrorCode(n)))
}
return n
}
// Message decodes the message containined in a delivery.
// Will return an error if delivery.HasMessage() is false.
func (delivery Delivery) Message() (m amqp.Message, err error) {
if !delivery.Readable() || delivery.Partial() {
return nil, internal.Errorf("attempting to get incomplete message")
}
data := make([]byte, delivery.Pending())
result := delivery.Link().Recv(data)
if result != len(data) {
return nil, internal.Errorf("cannot receive message: %s", internal.PnErrorCode(result))
}
m = amqp.NewMessage()
err = m.Decode(data)
return
}
func (m *message) Encode(buffer []byte) ([]byte, error) {
encode := func(buf []byte) ([]byte, error) {
len := cLen(buf)
result := C.pn_message_encode(m.pn, cPtr(buf), &len)
switch {
case result == C.PN_OVERFLOW:
return buf, overflow
case result < 0:
return buf, internal.Errorf("cannot encode message: %s", internal.PnErrorCode(result))
default:
return buf[:len], nil
}
}
return encodeGrow(buffer, encode)
}
// Send sends a amqp.Message over a Link.
// Returns a Delivery that can be use to determine the outcome of the message.
func (link Link) Send(m amqp.Message) (Delivery, error) {
if !link.IsSender() {
return Delivery{}, internal.Errorf("attempt to send message on receiving link")
}
delivery := link.Delivery(tags.Next())
bytes, err := m.Encode(nil)
if err != nil {
return Delivery{}, internal.Errorf("cannot send mesage %s", err)
}
result := link.SendBytes(bytes)
link.Advance()
if result != len(bytes) {
if result < 0 {
return delivery, internal.Errorf("send failed %v", internal.PnErrorCode(result))
} else {
return delivery, internal.Errorf("send incomplete %v of %v", result, len(bytes))
}
}
if link.RemoteSndSettleMode() == SndSettled {
delivery.Settle()
}
return delivery, nil
}