Error unmarshalling message body from amqp - go

Question

I'm trying to send a JSON inside the body of the message using AMQP and receive it. The message sends without any error, however I can't unmarshall it on the other side. I get a unexpected end of JSON input error.
JSON:
var jsonStr = []byte(`
{
"name": "Test",
"phone_number": "12345"
}`)
err = files.SendMessageToCore(jsonStr, "event.saveorder")
if err != nil {
logr.Error("Error sending a message to rabbitmq:", fmt.Sprintf("%v", err))
}
SendMessageToCore function:
func SendMessageToCore(body []byte, routingKey string) error {
pb, err := GetRabbitPublisher()
if err != nil {
return err
}
var message amqp.Message
message.Exchange = "example"
message.RoutingKey = routingKey
message.Body = body
messageByte, err := json.Marshal(message)
if err != nil {
return err
}
err = (*pb).Publish(amqp.Message{Exchange: message.Exchange, RoutingKey: message.RoutingKey, Body: messageByte})
if err != nil {
return err
}
fmt.Println("Message was successfully sent")
return nil
}
Unmarshalling part:
func SaveOrderEventHandler(mes amqp.Message) *amqp.Message {
var incomingMessage amqp.Message
if err := json.Unmarshal(mes.Body, &incomingMessage); err != nil {
fmt.Println(err)
return nil
}
var user foodDomain.User
if err := json.Unmarshal(incomingMessage.Body, &user); err != nil {
fmt.Println("Error unmarshalling incomingMessage body: ", err) //Error appears here
return nil
}
fmt.Println(user.PhoneNumber)
return nil
}
User struct:
type User struct {
Name string `json:"name"`
PhoneNumber string `json:"phone_number"`
}

Answer 1

In your SendMessageToCore you already initialized amqb.Message. No need to re-initialize in the Publish func, just pass your initialized message. Also, your json string body is already in jsonByte, so no need to marshal it once more.
For instance -
func SendMessageToCore(body []byte, routingKey string) error {
pb, err := GetRabbitPublisher()
if err != nil {
return err
}
var message amqp.Message
message.Exchange = "example"
message.RoutingKey = routingKey
message.Body = body
err = (*pb).Publish(message)
if err != nil {
return err
}
fmt.Println("Message was successfully sent")
return nil
}
And your mes already in amqp.Message type, so no need to unmarshal mes.Body into amqp.Message type variable.
Just directly unmarshal your mes.Body into user.
func SaveOrderEventHandler(mes amqp.Message) *amqp.Message {
var user foodDomain.User
if err := json.Unmarshal(mes.Body, &user); err != nil {
fmt.Println(err)
return nil
}
fmt.Println(user.PhoneNumber)
return nil
}