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Update main.py
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main.py
CHANGED
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import os
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import io
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from
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from fastapi
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from
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from
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from
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from
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from linebot
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MessageEvent,
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TextMessage,
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TextSendMessage,
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ImageSendMessage,
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ImageMessage,
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)
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import PIL.Image # 匯入 PIL (Pillow) 函式庫,用於處理圖片
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import uvicorn # 匯入 uvicorn,用於運行 FastAPI 應用程式
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# LangChain 相關匯入
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from langchain_core.prompts import ChatPromptTemplate # 匯入 LangChain 的聊天提示模板
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from langchain_core.tools import tool # 匯入 LangChain 的工具裝飾器
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from langchain_google_genai import ChatGoogleGenerativeAI # 匯入 LangChain 的 Google GenAI 聊天模型
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from langchain.agents import AgentExecutor, create_tool_calling_agent # 匯入 LangChain 的代理人執行器和建立工具
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# ==========================
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# 環境設定與工具函式
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# ==========================
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# 設置 Google AI API 金鑰 (從環境變數讀取)
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google_api = os.environ["GOOGLE_API_KEY"]
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# 初始化 Google GenAI 客戶端
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genai_client = genai.Client(api_key=google_api)
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line_handler = WebhookHandler(os.environ["CHANNEL_SECRET"])
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# 使用 defaultdict 模擬用戶訊息歷史存儲
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# 鍵(key)為 user_id,值(value)為一個儲存訊息的列表(list)
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user_message_history = defaultdict(list)
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# 建立 FastAPI 應用程式實例
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app = FastAPI()
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app.mount("/static", StaticFiles(directory="static"), name="static")
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# 設定 CORS (跨來源資源共用)
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app.add_middleware(
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CORSMiddleware,
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allow_origins=["*"],
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allow_credentials=True,
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allow_methods=["*"],
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allow_headers=["*"],
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)
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def get_image_url_from_line(message_id):
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"""
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從 Line 訊息 ID 獲取圖片內容並儲存到暫存檔案。
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Args:
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message_id: Line 訊息的 ID。
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Returns:
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成功時回傳圖片儲存的本地路徑,失敗時回傳 None。
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"""
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try:
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# 透過 Line Bot API 獲取訊息內容
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message_content = line_bot_api.get_message_content(message_id)
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#
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file_path = f"/tmp/{message_id}.png"
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# 將圖片內容以二進位寫入模式寫入檔案
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with open(file_path, "wb") as f:
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for chunk in message_content.iter_content():
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f.write(chunk)
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print(f"✅ 圖片成功儲存到:{file_path}")
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return file_path
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except Exception as e:
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print(f"❌ 圖片取得失敗:{e}")
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return None
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def store_user_message(user_id, message_type, message_content):
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"""
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儲存用戶的訊息到 user_message_history 字典中。
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Args:
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user_id: 用戶的 ID。
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message_type: 訊息類型 (例如 "image" 或 "text")。
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message_content: 訊息內容 (例如圖片路徑或文字)。
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"""
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user_message_history[user_id].append(
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{"type": message_type, "content": message_content}
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)
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def get_previous_message(user_id):
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"""
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獲取用戶的上一則訊息。
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Args:
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user_id: 用戶的 ID。
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Returns:
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如果歷史紀錄存在,回傳上一則訊息的字典;否則回傳預設的文字訊息。
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"""
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if user_id in user_message_history and len(user_message_history[user_id]) > 0:
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# 回傳最後一則訊息
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return user_message_history[user_id][-1]
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# 如果沒有歷史紀錄,回傳一個預設值
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return {"type": "text", "content": "No message!"}
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# ==========================
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# LangChain 工具定義
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# ==========================
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@tool
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def generate_and_upload_image(prompt: str) -> str:
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"""
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這個工具可以根據文字提示生成圖片,並將其上傳到伺服器。
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Args:
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prompt: 用於生成圖片的文字提示。
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Returns:
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回傳生成圖片的 URL。
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"""
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try:
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#
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response = genai_client.models.generate_content(
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model="imagen-
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contents=prompt,
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config=types.GenerateContentConfig(response_modalities=['
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)
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image_binary = None
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# 遍歷回應的 parts,找到圖片的二進位數據
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for part in response.candidates[0].content.parts:
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if part.inline_data
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image_binary = part.inline_data.data
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break
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if image_binary:
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# 使用 PIL 將二進位數據轉換為圖片物件
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image = PIL.Image.open(io.BytesIO(image_binary))
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file_name = f"static/{os.urandom(16).hex()}.png"
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image.save(file_name, format="PNG")
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#
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image_url =
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return image_url
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return "圖片生成失敗。"
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except Exception as e:
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return f"圖片生成
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@tool
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def analyze_image_with_text(image_path: str, user_text: str) -> str:
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"""
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這個工具可以根據圖片和文字提示來回答問題 (多模態分析)。
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Args:
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image_path: 圖片在本地端儲存的路徑。
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user_text: 針對圖片提出的文字問題。
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Returns:
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模型針對圖片和文字提示給出的回應。
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"""
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try:
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# 檢查圖片路徑是否存在
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if not os.path.exists(image_path):
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return "圖片
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# 使用 PIL 開啟圖片
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img_user = PIL.Image.open(image_path)
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#
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response = genai_client.models.generate_content(
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)
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if
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out = response.text
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else:
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out = "Gemini沒答案!請換個說法!"
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except Exception as e:
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out = f"Gemini執行出錯: {e}"
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return out
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# ==========================
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# LangChain 代理人設定
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# ==========================
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# 結合所有定義的工具
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tools = [generate_and_upload_image, analyze_image_with_text]
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prompt_template = ChatPromptTemplate([
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("system", "你是一個強大的圖像生成與問答助理,可以根據用戶的請求使用提供的工具。當你執行 generate_and_upload_image 工具\
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成功後會獲得一個 URL,然後你回答的 output 要包含有這個 URL 的完整資訊。如果工具有產生錯誤訊息請解讀並回應。"), # 系統提示 (System Prompt)
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("user", "{input}"), # 用戶輸入的佔位符
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("placeholder", "{agent_scratchpad}"), # 代理人思考過程的佔位符
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])
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# 建立工具調用代理人 (Tool Calling Agent)
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agent = create_tool_calling_agent(llm, tools, prompt_template)
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agent_executor = AgentExecutor(agent=agent, tools=tools, verbose=True) # verbose=True 會在終端印出代理人的思考過程
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# ==========================
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# FastAPI 路由
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@app.get("/")
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def root():
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"""
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根路徑,用於基本測試。
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"""
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return {"title": "Line Bot"}
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@app.post("/webhook")
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async def webhook(
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request: Request,
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background_tasks: BackgroundTasks,
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x_line_signature=Header(None), # 從標頭獲取 Line 的簽章
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):
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"""
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Line Bot 的 Webhook 路由。
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"""
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# 獲取請求的原始內容 (body)
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body = await request.body()
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try:
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background_tasks.add_task(
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line_handler.handle, body.decode("utf-8"), x_line_signature
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)
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except InvalidSignatureError:
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raise HTTPException(status_code=400, detail="Invalid signature")
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return "ok"
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# 註冊訊息處理器,處理「圖片訊息」和「文字訊息」
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@line_handler.add(MessageEvent, message=(ImageMessage, TextMessage))
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def handle_message(event):
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"""
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主要的訊息處理邏輯。
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"""
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# 獲取用戶 ID
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user_id = event.source.user_id
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# 情況一:處理圖片上傳
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if event.message.type == "image":
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# 獲取 Line 傳來的圖片,並儲存到本地
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image_path = get_image_url_from_line(event.message.id)
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if image_path:
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# 將圖片路徑儲存到用戶的訊息歷史中
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store_user_message(user_id, "image", image_path)
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line_bot_api.reply_message(
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event.reply_token, TextSendMessage(text="圖片已接收成功囉,幫我輸入你想詢問的問題喔~")
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)
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else:
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line_bot_api.reply_message(
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event.reply_token, TextSendMessage(text="沒有接收到圖片~")
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)
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# 情況二:處理文字訊息
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elif event.message.type == "text":
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user_text = event.message.text
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# 獲取該用戶的「上一則」訊息
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previous_message = get_previous_message(user_id)
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# 根據上一則訊息類型,動態組合給代理人的輸入
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if previous_message["type"] == "image":
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# 如果上一則是圖片,代表用戶現在的文字是「針對圖片的提問」
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image_path = previous_message["content"]
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agent_input = {
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}
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# 清除上一則圖片訊息,避免下一次文字訊息還被當作是圖片問答
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user_message_history[user_id].pop()
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else:
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# 如果上一則不是圖片 (或沒有上一���),代表這是一般的文字提問 (可能是要求生成圖片)
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agent_input = {"input": user_text}
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try:
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# 運行 LangChain 代理人
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response = agent_executor.invoke(agent_input)
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# 獲取代理人最終的輸出
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out = response["output"]
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# 如果輸出不是 URL,則直接回覆文字
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line_bot_api.reply_message(event.reply_token, TextSendMessage(text=out))
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except Exception as e:
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# 處理代理人執行時的錯誤
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print(f"代理人執行出錯: {e}")
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out = f"代理人執行出錯!錯誤訊息:{e}"
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line_bot_api.reply_message(event.reply_token, TextSendMessage(text=out))
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if __name__ == "__main__":
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uvicorn.run("main:app", host="0.0.0.0", port=7860, reload=True)
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import os
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import io
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import PIL.Image
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import uvicorn
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from collections import defaultdict
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from fastapi import FastAPI, Request, Header, BackgroundTasks, HTTPException
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from fastapi.middleware.cors import CORSMiddleware
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from fastapi.staticfiles import StaticFiles
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from google import genai
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from google.genai import types
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from linebot import LineBotApi, WebhookHandler
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from linebot.exceptions import InvalidSignatureError
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from linebot.models import (
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MessageEvent,
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TextMessage,
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TextSendMessage,
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ImageSendMessage,
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ImageMessage,
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)
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# --- 修正後的 LangChain 匯入路徑 ---
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from langchain_core.prompts import ChatPromptTemplate, MessagesPlaceholder
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from langchain_core.tools import tool
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from langchain_google_genai import ChatGoogleGenerativeAI
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from langchain.agents import AgentExecutor, create_tool_calling_agent
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# ==========================
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# 環境設定與工具函式
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# ==========================
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google_api = os.environ.get("GOOGLE_API_KEY")
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genai_client = genai.Client(api_key=google_api)
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line_bot_api = LineBotApi(os.environ.get("CHANNEL_ACCESS_TOKEN"))
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line_handler = WebhookHandler(os.environ.get("CHANNEL_SECRET"))
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user_message_history = defaultdict(list)
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app = FastAPI()
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# 確保 static 資料夾存在
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if not os.path.exists("static"):
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os.makedirs("static")
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app.mount("/static", StaticFiles(directory="static"), name="static")
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app.add_middleware(
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CORSMiddleware,
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allow_origins=["*"],
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allow_credentials=True,
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allow_methods=["*"],
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allow_headers=["*"],
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)
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def get_image_url_from_line(message_id):
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| 54 |
try:
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| 55 |
message_content = line_bot_api.get_message_content(message_id)
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| 56 |
+
file_path = f"static/{message_id}.png" # 改存到 static 方便讀取
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| 57 |
with open(file_path, "wb") as f:
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| 58 |
for chunk in message_content.iter_content():
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| 59 |
f.write(chunk)
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| 60 |
return file_path
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| 61 |
except Exception as e:
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| 62 |
print(f"❌ 圖片取得失敗:{e}")
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| 63 |
return None
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| 64 |
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| 65 |
def store_user_message(user_id, message_type, message_content):
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| 66 |
+
user_message_history[user_id].append({"type": message_type, "content": message_content})
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| 67 |
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| 68 |
def get_previous_message(user_id):
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| 69 |
if user_id in user_message_history and len(user_message_history[user_id]) > 0:
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| 70 |
return user_message_history[user_id][-1]
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| 71 |
return {"type": "text", "content": "No message!"}
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| 72 |
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| 73 |
# ==========================
|
| 74 |
# LangChain 工具定義
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| 75 |
# ==========================
|
| 76 |
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| 77 |
@tool
|
| 78 |
def generate_and_upload_image(prompt: str) -> str:
|
| 79 |
+
"""根據文字提示生成圖片。"""
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| 80 |
try:
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| 81 |
+
# 修正模型名稱:目前最新穩定版為 imagen-3
|
| 82 |
response = genai_client.models.generate_content(
|
| 83 |
+
model="imagen-3.0-generate-001",
|
| 84 |
+
contents=prompt,
|
| 85 |
+
config=types.GenerateContentConfig(response_modalities=['IMAGE'])
|
| 86 |
)
|
| 87 |
|
| 88 |
image_binary = None
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|
| 89 |
for part in response.candidates[0].content.parts:
|
| 90 |
+
if part.inline_data:
|
| 91 |
image_binary = part.inline_data.data
|
| 92 |
break
|
| 93 |
|
| 94 |
if image_binary:
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|
| 95 |
image = PIL.Image.open(io.BytesIO(image_binary))
|
| 96 |
+
file_name = f"static/{os.urandom(8).hex()}.png"
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|
| 97 |
image.save(file_name, format="PNG")
|
| 98 |
|
| 99 |
+
# 修正 URL 拼接邏輯
|
| 100 |
+
base_url = os.getenv("HF_SPACE", "http://localhost:7860").rstrip("/")
|
| 101 |
+
image_url = f"{base_url}/{file_name}"
|
| 102 |
return image_url
|
| 103 |
+
return "圖片生成失敗:模型未回傳數據。"
|
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|
| 104 |
except Exception as e:
|
| 105 |
+
return f"圖片生成失敗: {e}"
|
| 106 |
|
| 107 |
@tool
|
| 108 |
def analyze_image_with_text(image_path: str, user_text: str) -> str:
|
| 109 |
+
"""根據圖片路徑和文字提問進行分析。"""
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|
| 110 |
try:
|
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|
| 111 |
if not os.path.exists(image_path):
|
| 112 |
+
return "錯誤:找不到該圖片檔案。"
|
| 113 |
|
|
|
|
| 114 |
img_user = PIL.Image.open(image_path)
|
| 115 |
+
# 修正模型名稱:目前為 gemini-1.5-flash 或 gemini-2.0-flash-exp
|
| 116 |
response = genai_client.models.generate_content(
|
| 117 |
+
model="gemini-3-flash-preview",
|
| 118 |
+
contents=[img_user, user_text]
|
| 119 |
)
|
| 120 |
+
return response.text if response.text else "Gemini 沒答案!"
|
|
|
|
|
|
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|
|
|
| 121 |
except Exception as e:
|
| 122 |
+
return f"分析出錯: {e}"
|
|
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|
|
|
|
|
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|
|
| 123 |
|
| 124 |
# ==========================
|
| 125 |
# LangChain 代理人設定
|
| 126 |
# ==========================
|
|
|
|
|
|
|
| 127 |
tools = [generate_and_upload_image, analyze_image_with_text]
|
| 128 |
+
# 修正模型名稱
|
| 129 |
+
llm = ChatGoogleGenerativeAI(model="gemini-3-flash-preview", temperature=0.2)
|
| 130 |
|
| 131 |
+
prompt_template = ChatPromptTemplate.from_messages([
|
| 132 |
+
("system", "你是一個強大的助理。如果生成了圖片,請直接給出 URL。"),
|
| 133 |
+
("user", "{input}"),
|
| 134 |
+
MessagesPlaceholder(variable_name="agent_scratchpad"),
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| 135 |
])
|
| 136 |
|
|
|
|
| 137 |
agent = create_tool_calling_agent(llm, tools, prompt_template)
|
| 138 |
+
agent_executor = AgentExecutor(agent=agent, tools=tools, verbose=True, handle_parsing_errors=True)
|
|
|
|
| 139 |
|
| 140 |
# ==========================
|
| 141 |
# FastAPI 路由
|
|
|
|
| 143 |
|
| 144 |
@app.get("/")
|
| 145 |
def root():
|
| 146 |
+
return {"status": "running"}
|
|
|
|
|
|
|
|
|
|
| 147 |
|
| 148 |
@app.post("/webhook")
|
| 149 |
+
async def webhook(request: Request, background_tasks: BackgroundTasks, x_line_signature=Header(None)):
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| 150 |
body = await request.body()
|
| 151 |
try:
|
| 152 |
+
background_tasks.add_task(line_handler.handle, body.decode("utf-8"), x_line_signature)
|
|
|
|
|
|
|
|
|
|
| 153 |
except InvalidSignatureError:
|
| 154 |
+
raise HTTPException(status_code=400)
|
|
|
|
| 155 |
return "ok"
|
| 156 |
|
|
|
|
| 157 |
@line_handler.add(MessageEvent, message=(ImageMessage, TextMessage))
|
| 158 |
def handle_message(event):
|
|
|
|
|
|
|
|
|
|
|
|
|
| 159 |
user_id = event.source.user_id
|
| 160 |
|
|
|
|
| 161 |
if event.message.type == "image":
|
|
|
|
| 162 |
image_path = get_image_url_from_line(event.message.id)
|
| 163 |
if image_path:
|
|
|
|
| 164 |
store_user_message(user_id, "image", image_path)
|
| 165 |
+
line_bot_api.reply_message(event.reply_token, TextSendMessage(text="收到圖片了!請問你想對這張圖做什麼分析?"))
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| 166 |
|
|
|
|
| 167 |
elif event.message.type == "text":
|
| 168 |
+
user_text = event.message.text
|
|
|
|
| 169 |
previous_message = get_previous_message(user_id)
|
| 170 |
+
|
|
|
|
|
|
|
| 171 |
if previous_message["type"] == "image":
|
|
|
|
| 172 |
image_path = previous_message["content"]
|
| 173 |
+
agent_input = {"input": f"請分析這張圖片 {image_path},問題是:{user_text}"}
|
| 174 |
+
user_message_history[user_id].pop() # 用完即丟
|
|
|
|
|
|
|
|
|
|
| 175 |
else:
|
|
|
|
| 176 |
agent_input = {"input": user_text}
|
| 177 |
+
|
| 178 |
try:
|
|
|
|
| 179 |
response = agent_executor.invoke(agent_input)
|
|
|
|
| 180 |
out = response["output"]
|
| 181 |
|
| 182 |
+
if "http" in out and (".png" in out or ".jpg" in out):
|
| 183 |
+
# 簡單提取第一個 URL
|
| 184 |
+
import re
|
| 185 |
+
urls = re.findall(r'http[s]?://(?:[a-zA-Z]|[0-9]|[$-_@.&+]|[!*\(\),]|(?:%[0-9a-fA-F][0-9a-fA-F]))+', out)
|
| 186 |
+
if urls:
|
| 187 |
+
image_url = urls[0]
|
| 188 |
+
line_bot_api.reply_message(
|
| 189 |
+
event.reply_token,
|
| 190 |
+
[
|
| 191 |
+
TextSendMessage(text="這是為你生成的圖片:"),
|
| 192 |
+
ImageSendMessage(original_content_url=image_url, preview_image_url=image_url)
|
| 193 |
+
]
|
| 194 |
+
)
|
| 195 |
+
return
|
| 196 |
+
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| 197 |
line_bot_api.reply_message(event.reply_token, TextSendMessage(text=out))
|
| 198 |
+
|
| 199 |
+
except Exception as e:
|
| 200 |
+
line_bot_api.reply_message(event.reply_token, TextSendMessage(text=f"系統忙碌中,請稍後再試。"))
|
| 201 |
|
| 202 |
if __name__ == "__main__":
|
| 203 |
+
uvicorn.run(app, host="0.0.0.0", port=7860)
|
|
|