160 lines
5.4 KiB
Python
160 lines
5.4 KiB
Python
import os
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import uuid
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import requests
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from typing import Optional
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from contextlib import asynccontextmanager
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import torch
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import matplotlib
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# 关键：设置非交互式后端，避免服务器环境下报错
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matplotlib.use('Agg')
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import matplotlib.pyplot as plt
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from fastapi import FastAPI, File, UploadFile, Form, HTTPException, Request
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from fastapi.staticfiles import StaticFiles
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from fastapi.responses import JSONResponse
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from PIL import Image
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# SAM3 相关导入 (请确保你的环境中已正确安装 sam3)
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from sam3.model_builder import build_sam3_image_model
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from sam3.model.sam3_image_processor import Sam3Processor
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from sam3.visualization_utils import plot_results
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# ------------------- 配置与路径 -------------------
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STATIC_DIR = "static"
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RESULT_IMAGE_DIR = os.path.join(STATIC_DIR, "results")
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os.makedirs(RESULT_IMAGE_DIR, exist_ok=True)
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# ------------------- 生命周期管理 -------------------
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@asynccontextmanager
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async def lifespan(app: FastAPI):
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"""
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FastAPI 生命周期管理器：在服务启动时加载模型，关闭时清理资源
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"""
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print("正在加载 SAM3 模型到 GPU...")
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# 1. 检测设备
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device = torch.device("cuda" if torch.cuda.is_available() else "cpu")
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if not torch.cuda.is_available():
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print("警告: 未检测到 GPU，将使用 CPU，速度会较慢。")
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# 2. 加载模型 (全局单例)
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model = build_sam3_image_model()
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model = model.to(device)
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model.eval() # 切换到评估模式
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# 3. 初始化 Processor
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processor = Sam3Processor(model)
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# 4. 存入 app.state 供全局访问
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app.state.model = model
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app.state.processor = processor
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app.state.device = device
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print(f"模型加载完成，设备: {device}")
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yield # 服务运行中...
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# 清理资源 (如果需要)
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print("正在清理资源...")
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# ------------------- FastAPI 初始化 -------------------
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app = FastAPI(lifespan=lifespan, title="SAM3 Segmentation API")
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# 挂载静态文件目录，用于通过 URL 访问生成的图片
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app.mount("/static", StaticFiles(directory=STATIC_DIR), name="static")
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# ------------------- 辅助函数 -------------------
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def load_image_from_url(url: str) -> Image.Image:
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"""从网络 URL 下载图片"""
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try:
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headers = {'User-Agent': 'Mozilla/5.0'}
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response = requests.get(url, headers=headers, stream=True, timeout=10)
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response.raise_for_status()
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image = Image.open(response.raw).convert("RGB")
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return image
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except Exception as e:
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raise HTTPException(status_code=400, detail=f"无法下载图片: {str(e)}")
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def generate_and_save_result(image: Image.Image, inference_state) -> str:
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"""生成可视化结果图并保存，返回文件名"""
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# 生成唯一文件名防止冲突
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filename = f"seg_{uuid.uuid4().hex}.jpg"
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save_path = os.path.join(RESULT_IMAGE_DIR, filename)
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# 绘图 (复用你提供的逻辑)
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plot_results(image, inference_state)
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# 保存
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plt.savefig(save_path, dpi=150, bbox_inches='tight')
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plt.close() # 务必关闭，防止内存泄漏
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return filename
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# ------------------- API 接口 -------------------
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@app.post("/segment")
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async def segment(
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request: Request,
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prompt: str = Form(...),
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file: Optional[UploadFile] = File(None),
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image_url: Optional[str] = Form(None)
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):
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"""
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接收图片 (文件上传 或 URL) 和 文本提示词，返回分割后的图片 URL。
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"""
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# 1. 校验输入
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if not file and not image_url:
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raise HTTPException(status_code=400, detail="必须提供 file (图片文件) 或 image_url (图片链接)")
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# 2. 获取图片对象
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try:
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if file:
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image = Image.open(file.file).convert("RGB")
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elif image_url:
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image = load_image_from_url(image_url)
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except Exception as e:
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raise HTTPException(status_code=400, detail=f"图片解析失败: {str(e)}")
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# 3. 获取模型
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processor = request.app.state.processor
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# 4. 执行推理
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try:
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# 这一步内部应该已经由 Sam3Processor 处理了 GPU 张量转移
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inference_state = processor.set_image(image)
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output = processor.set_text_prompt(state=inference_state, prompt=prompt)
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masks, boxes, scores = output["masks"], output["boxes"], output["scores"]
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except Exception as e:
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raise HTTPException(status_code=500, detail=f"模型推理错误: {str(e)}")
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# 5. 生成可视化并保存
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try:
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filename = generate_and_save_result(image, inference_state)
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except Exception as e:
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raise HTTPException(status_code=500, detail=f"绘图保存错误: {str(e)}")
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# 6. 构建返回 URL
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# request.url_for 会自动根据当前域名生成正确的访问链接
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file_url = request.url_for("static", path=f"results/{filename}")
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return JSONResponse(content={
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"status": "success",
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"result_image_url": str(file_url),
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"detected_count": len(masks),
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"scores": scores.tolist() if torch.is_tensor(scores) else scores
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})
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if __name__ == "__main__":
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import uvicorn
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# 使用 Python 函数参数的方式传递配置
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uvicorn.run(
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"fastAPI_main:app", # 注意：这里要改成你的文件名:app对象名
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host="127.0.0.1",
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port=55600,
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proxy_headers=True, # 对应 --proxy-headers
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forwarded_allow_ips="*" # 对应 --forwarded-allow-ips="*"
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)
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