Add tool calling support to streamed requests

pkg/cli/openai.go

@@ -71,9 +71,8 @@ func CreateChatCompletion(model string, messages []Message, maxTokens int) (stri
 		// Append the assistant's reply with its request for tool calls
 		toolCallJson, _ := json.Marshal(choice.Message.ToolCalls)
 		messages = append(messages, Message{
-			ConversationID: messages[0].ConversationID,
-			Role:           "assistant",
-			ToolCalls:      sql.NullString{String: string(toolCallJson), Valid: true},
+			Role:      "assistant",
+			ToolCalls: sql.NullString{String: string(toolCallJson), Valid: true},
 		})
 
 		toolReplies, err := ExecuteToolCalls(choice.Message.ToolCalls)
@@ -103,7 +102,10 @@ func CreateChatCompletionStream(model string, messages []Message, maxTokens int,
 	}
 	defer stream.Close()
 
-	sb := strings.Builder{}
+	content := strings.Builder{}
+	toolCalls := []openai.ToolCall{}
+
+	// Iterate stream segments
 	for {
 		response, e := stream.Recv()
 		if errors.Is(e, io.EOF) {
@@ -114,9 +116,47 @@ func CreateChatCompletionStream(model string, messages []Message, maxTokens int,
 			err = e
 			break
 		}
-		chunk := response.Choices[0].Delta.Content
-		output <- chunk
-		sb.WriteString(chunk)
+
+		delta := response.Choices[0].Delta
+		if len(delta.ToolCalls) > 0 {
+			// Construct streamed tool_call arguments
+			for _, tc := range delta.ToolCalls {
+				if tc.Index == nil {
+					return "", fmt.Errorf("Unexpected nil index for streamed tool call.")
+				}
+				if len(toolCalls) <= *tc.Index {
+					toolCalls = append(toolCalls, tc)
+				} else {
+					toolCalls[*tc.Index].Function.Arguments += tc.Function.Arguments
+				}
+			}
+		} else {
+			output <- delta.Content
+			content.WriteString(delta.Content)
+		}
 	}
-	return sb.String(), err
+
+	if len(toolCalls) > 0 {
+		if content.String() != "" {
+			return "", fmt.Errorf("Model replied with user-facing content in addition to tool calls. Unsupported.")
+		}
+
+		// Append the assistant's reply with its request for tool calls
+		toolCallJson, _ := json.Marshal(toolCalls)
+		messages = append(messages, Message{
+			Role:      "assistant",
+			ToolCalls: sql.NullString{String: string(toolCallJson), Valid: true},
+		})
+
+		toolReplies, err := ExecuteToolCalls(toolCalls)
+		if err != nil {
+			return "", err
+		}
+
+		// Recurse into CreateChatCompletionStream with the tool call replies
+		// added to the original messages
+		return CreateChatCompletionStream(model, append(messages, toolReplies...), maxTokens, output)
+	}
+
+	return content.String(), err
 }