fix: fix dashscope first message role issue (#149)

fix: fix dashscope first message role issue (#149)
Co-Authored-By: Minghan Zhang <[email protected]>

adapter/dashscope/chat.go

@@ -20,11 +20,21 @@ func (c *ChatInstance) GetHeader() map[string]string {
 
 func (c *ChatInstance) FormatMessages(message []globals.Message) []Message {
 	var messages []Message
+	var start bool
 	for _, v := range message {
 		if v.Role == globals.Tool {
 			continue
 		}
 
+		if !start {
+			start = true
+
+			// dashscope first message should be [`user`, `system`] role, convert other roles to `user`
+			if v.Role != globals.User && v.Role != globals.System {
+				v.Role = globals.User
+			}
+		}
+
 		messages = append(messages, Message{
 			Role:    v.Role,
 			Content: v.Content,