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Update app.py
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app.py
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@@ -1,36 +1,50 @@
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import io
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import os
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import base64
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from typing import Optional
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import httpx
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from PIL import Image
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import gradio as gr
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from fastapi import FastAPI
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#
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STEPFUN_ENDPOINT = os.getenv("STEPFUN_ENDPOINT", "https://api.stepfun.com/v1")
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MODEL_NAME = os.getenv("
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TITLE = "StepFun ·
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DESC = "
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def _get_api_key() -> Optional[str]:
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return os.getenv("OPENAI_API_KEY") or os.getenv("STEPFUN_KEY")
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def _pil_to_data_url(img: Image.Image, fmt: str = "PNG") -> str:
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buf = io.BytesIO()
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img.save(buf, format=fmt)
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b64 = base64.b64encode(buf.getvalue()).decode("utf-8")
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mime = "image/png" if fmt.upper() == "PNG" else "image/jpeg"
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return f"data:{mime};base64,{b64}"
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key = _get_api_key()
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if not key:
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raise RuntimeError(
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"API Key
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"OPENAI_API_KEY 或 STEPFUN_KEY(值为 StepFun API Key)。"
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)
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@@ -44,16 +58,25 @@ def _post_chat(messages: list, temperature: float = 0.7, timeout: float = 60.0)
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"messages": messages,
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"temperature": temperature,
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}
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return data["choices"][0]["message"]["content"]
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if image is None:
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return "
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data_url = _pil_to_data_url(image, fmt="PNG")
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messages = [
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{
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@@ -64,46 +87,49 @@ def infer(image: Optional[Image.Image], question: Optional[str]) -> str:
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],
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}
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]
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try:
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return _post_chat(messages)
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except httpx.HTTPStatusError as e:
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except Exception as e:
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return f"调用失败:{repr(e)}"
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# ------- Gradio 界面 -------
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demo = gr.Interface(
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fn=infer,
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inputs=[
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gr.Image(type="pil", label="上传图片"),
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gr.Textbox(label="问题", placeholder="例如:这是什么菜?怎么做?"),
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],
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outputs=gr.Textbox(label="回答"),
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title=TITLE,
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description=DESC,
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)
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# ------- FastAPI 宿主应用(覆盖 /info,避免 gradio_client 的 schema 解析) -------
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fastapi_app = FastAPI()
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@fastapi_app.get("/health")
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def health():
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return {"status": "ok"}
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@fastapi_app.get("/info")
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def info_stub():
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# 返回一个最小可用的对象,绕过 gradio 的 api_info 复杂逻辑
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return {
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"api": False,
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"message": "API docs 已禁用(此路由由外部 FastAPI 覆盖以规避依赖冲突)。"
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}
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#
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import uvicorn
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port = int(os.getenv("PORT", "7860"))
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# 注意:本地调试可以启;Spaces 不会走这里
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uvicorn.run(app, host="0.0.0.0", port=port)
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import os
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import io
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import base64
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from typing import Optional
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import httpx
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import gradio as gr
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from PIL import Image
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from fastapi import FastAPI
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# --------- 基本配置 ---------
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STEPFUN_ENDPOINT = os.getenv("STEPFUN_ENDPOINT", "https://api.stepfun.com/v1")
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MODEL_NAME = os.getenv("MODEL_NAME", "step-3")
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TITLE = "StepFun · step-3 图片问答 Demo"
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DESC = "上传一张图片,问一个问题;后台通过 StepFun OpenAI 兼容接口完成图文对话。"
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FOOTER = "提示:在 HF Spaces 的 Settings -> Variables 里设置 OPENAI_API_KEY 或 STEPFUN_KEY"
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# ---------------------------
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def _get_api_key() -> Optional[str]:
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"""
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从环境变量里取 API Key。
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优先 OPENAI_API_KEY(OpenAI 兼容接口的常用名),否则退回 STEPFUN_KEY。
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"""
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return os.getenv("OPENAI_API_KEY") or os.getenv("STEPFUN_KEY")
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def _pil_to_data_url(img: Image.Image, fmt: str = "PNG") -> str:
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"""
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PIL.Image -> data:image/...;base64,... (OpenAI兼容的 image_url 需要)
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"""
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buf = io.BytesIO()
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img.save(buf, format=fmt)
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b64 = base64.b64encode(buf.getvalue()).decode("utf-8")
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mime = "image/png" if fmt.upper() == "PNG" else "image/jpeg"
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return f"data:{mime};base64,{b64}"
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def _post_chat(messages: list, temperature: float = 0.7) -> str:
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"""
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直接用 httpx 调用 StepFun 的 /chat/completions 接口,返回文本。
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"""
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key = _get_api_key()
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if not key:
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raise RuntimeError(
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"API Key 未设置。\n"
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"请在本地环境变量或 HF Spaces -> Settings -> Variables 里设置:\n"
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"OPENAI_API_KEY 或 STEPFUN_KEY(值为 StepFun API Key)。"
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)
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"messages": messages,
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"temperature": temperature,
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}
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# 简单超时与错误抛出
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resp = httpx.post(url, headers=headers, json=payload, timeout=60)
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resp.raise_for_status()
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data = resp.json()
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return data["choices"][0]["message"]["content"]
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def chat_with_step3(image: Optional[Image.Image], question: Optional[str]) -> str:
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"""
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Gradio 回调函数:输入图片和问题,返回模型回答。
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"""
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if image is None:
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return "请先上传图片。"
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q = (question or "").strip()
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if not q:
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q = "请描述这张图片的内容,并指出可能的菜品名称与做法要点。"
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data_url = _pil_to_data_url(image, fmt="PNG")
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messages = [
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{
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],
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}
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]
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try:
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return _post_chat(messages)
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except httpx.HTTPStatusError as e:
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# 返回后端具体错误信息,便于排障
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try:
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detail = e.response.json()
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except Exception:
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detail = e.response.text
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return f"后端返回错误:HTTP {e.response.status_code}\n{detail}"
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except Exception as e:
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return f"调用失败:{repr(e)}"
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# --------- 构建 Gradio 界面 ---------
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with gr.Blocks(title=TITLE, analytics_enabled=False) as demo:
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gr.Markdown(f"## {TITLE}")
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gr.Markdown(DESC)
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with gr.Row():
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with gr.Column():
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img_in = gr.Image(type="pil", label="上传图片")
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txt_in = gr.Textbox(
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label="问题(可留空)",
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placeholder="例如:这是什么菜?做法是怎样的?",
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)
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btn = gr.Button("提交")
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with gr.Column():
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out = gr.Textbox(label="回答", lines=12)
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btn.click(fn=chat_with_step3, inputs=[img_in, txt_in], outputs=out)
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gr.Markdown(f"<small>{FOOTER}</small>")
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# 让 HF Spaces 识别到 FastAPI/ASGI 应用
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app = FastAPI()
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# 不使用自定义路径参数,直接挂载到根路径
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app = gr.mount_gradio_app(app, demo, path="/")
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# --------- 本地调试专用(Spaces 环境不会执行)---------
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if __name__ == "__main__" and os.environ.get("SPACE_BUILD") is None:
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import uvicorn
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port = int(os.getenv("PORT", "7860"))
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uvicorn.run(app, host="0.0.0.0", port=port)
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