Print error message received from RocketChat API

api/message.go

@@ -35,4 +35,11 @@ type AttachmentField struct {
 type MessageResponse struct {
 	Channel string	`json:"channel"`
 	Success	bool `json:"success"`
+	Error	string `json:"error"`
+}
+
+type MessageError struct {
+	Success bool `json:"success"`
+	Error string `json:"error"`
+	ErrorType string `json:"errorType"`
 }

api/message_post.go

@@ -1,21 +1,25 @@
 package rocket
 
-import "errors"
+import (
+	"fmt"
+)
 
 const (
 	postMessagePath = "api/v1/chat.postMessage"
 )
 
 func (message *MessageService) Post(payload MessagePayload) (*MessageResponse, error) {
 
+	var msgError MessageError
 	var response MessageResponse
 	_, err := message.resty.R().
 		SetBody(payload).
+		SetError(&msgError).
 		SetResult(&response).
 		Post(postMessagePath)
 
 	if !response.Success {
-		return nil, errors.New("Posting message failed")
+		return nil, fmt.Errorf("Posting message to channel %s failed (%s)", payload.Channel, msgError.Error)
 	}
 
 	return &response, err

cmd/root.go

@@ -6,7 +6,7 @@ import (
 )
 
 const (
-	version = "1.0.2"
+	version = "1.0.3"
 )
 
 var rootCommand = &cobra.Command{