190 lines
7.1 KiB
Python
190 lines
7.1 KiB
Python
from fastapi import HTTPException
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import numpy as np
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import torch
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from MySQLdb import MySQLError
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from ultralytics import YOLO
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import os
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from ds.db import db
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from service.file_service import get_absolute_path
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# 全局变量：初始化时为None，无模型时保持None
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current_yolo_model = None
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current_model_absolute_path = None # 存储模型绝对路径，不依赖model实例
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ALLOWED_MODEL_EXT = {"pt"}
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MAX_MODEL_SIZE = 100 * 1024 * 1024 # 100MB
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def load_yolo_model():
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"""
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加载模型并存储绝对路径
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无有效模型路径/模型文件不存在/加载失败时，跳过加载（不抛出异常）
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"""
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global current_yolo_model, current_model_absolute_path
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# 1. 获取数据库中的模型路径（无模型时返回None）
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model_rel_path = get_enabled_model_rel_path()
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# 2. 无模型路径时，跳过加载
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if not model_rel_path:
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print("[模型初始化] 未获取到有效模型路径，已跳过模型加载")
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current_yolo_model = None
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current_model_absolute_path = None
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return None
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# 3. 有模型路径时，执行正常加载流程
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print(f"[模型初始化] 加载模型：{model_rel_path}")
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try:
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# 计算绝对路径（避免路径处理异常）
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current_model_absolute_path = get_absolute_path(model_rel_path)
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print(f"[模型初始化] 模型绝对路径：{current_model_absolute_path}")
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# 检查模型文件是否存在
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if not os.path.exists(current_model_absolute_path):
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print(f"[模型初始化] 警告：模型文件不存在（{current_model_absolute_path}），已跳过加载")
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current_yolo_model = None
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current_model_absolute_path = None
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return None
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# 加载YOLO模型
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new_model = YOLO(current_model_absolute_path)
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# 设备分配（GPU/CPU）
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if torch.cuda.is_available():
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new_model.to('cuda')
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print("[模型初始化] 模型已移动到GPU设备")
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else:
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print("[模型初始化] 未检测到GPU，使用CPU进行推理")
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# 更新全局模型变量
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current_yolo_model = new_model
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print(f"[模型初始化] 成功加载模型：{current_model_absolute_path}")
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return current_yolo_model
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# 捕获所有加载异常，避免中断项目启动
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except Exception as e:
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print(f"[模型初始化] 警告：模型加载失败（{str(e)}），已跳过加载")
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current_yolo_model = None
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current_model_absolute_path = None
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return None
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def get_current_model():
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"""
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获取当前模型实例
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无模型时返回None（不抛出异常，避免中断流程）
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"""
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return current_yolo_model
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def detect(image_np, conf_threshold=0.8):
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"""
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执行YOLO检测
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无模型时返回明确提示，不崩溃；有模型时正常返回检测结果
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"""
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# 优先检查模型是否已加载
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model = get_current_model()
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if not model:
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error_msg = "检测失败：未加载任何YOLO模型（数据库中无默认模型或模型加载失败）"
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print(f"[检测流程] {error_msg}")
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return False, error_msg # 返回False+错误提示，而非None
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# 2. 输入格式验证（保留原逻辑，格式错误仍抛异常，属于参数问题）
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if not isinstance(image_np, np.ndarray):
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raise ValueError("输入必须是numpy数组（BGR图像格式）")
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if image_np.ndim != 3 or image_np.shape[-1] != 3:
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raise ValueError(f"输入图像格式错误，需为 (高度, 宽度, 3) 的BGR数组，当前shape: {image_np.shape}")
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detection_results = []
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try:
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# 3. 检测配置
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device = "cuda" if torch.cuda.is_available() else "cpu"
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img_height, img_width = image_np.shape[:2]
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print(f"[检测流程] 设备：{device} | 置信度阈值：{conf_threshold} | 图像尺寸：{img_width}x{img_height}")
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# 4. 执行YOLO预测
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print("[检测流程] 开始执行YOLO检测")
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results = model.predict(
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image_np,
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conf=conf_threshold,
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device=device,
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show=False, # 不显示检测窗口
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verbose=False # 关闭YOLO内部日志（可选，减少冗余输出）
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)
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# 5. 整理检测结果（仅保留置信度达标结果，原逻辑保留）
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for box in results[0].boxes:
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class_id = int(box.cls[0])
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class_name = model.names[class_id]
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confidence = float(box.conf[0])
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# 转换为整数坐标（x1, y1, x2, y2）
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bbox = tuple(map(int, box.xyxy[0]))
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# 过滤条件：置信度达标
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if confidence >= conf_threshold and 0 <= class_id <= 5:
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detection_results.append({
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"class": class_name,
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"confidence": round(confidence, 4), # 保留4位小数，优化输出
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"bbox": bbox
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})
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# 6. 判断是否检测到目标
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has_content = len(detection_results) > 0
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print(f"[检测流程] 检测完成：共检测到 {len(detection_results)} 个目标")
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return has_content, detection_results
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# 7. 捕获检测过程异常，返回明确错误信息
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except Exception as e:
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error_msg = f"检测过程出错：{str(e)}"
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print(f"[检测流程] {error_msg}")
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return False, error_msg
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def get_enabled_model_rel_path():
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"""
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从数据库获取启用的默认模型相对路径
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无模型/数据库错误时返回None，仅记录警告日志
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"""
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conn = None
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cursor = None
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try:
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# 建立数据库连接
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conn = db.get_connection()
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cursor = conn.cursor(dictionary=True)
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# 查询默认模型（is_default=1）
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query = "SELECT path FROM model WHERE is_default = 1 LIMIT 1"
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cursor.execute(query)
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result = cursor.fetchone()
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# 有有效路径则返回，否则返回None
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if result and isinstance(result.get('path'), str) and result['path'].strip():
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model_path = result['path'].strip()
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print(f"找到默认模型路径：{model_path}")
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return model_path
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else:
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print("警告：未找到启用的默认模型")
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return None
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# 捕获MySQL相关错误
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except MySQLError as e:
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print(f"警告：查询默认模型时发生数据库错误（{str(e)}）")
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return None
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# 捕获其他通用错误
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except Exception as e:
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print(f"[数据库查询] 警告：获取默认模型路径失败（{str(e)}）")
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return None
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# 确保数据库连接和游标关闭
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finally:
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if cursor:
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try:
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cursor.close()
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print("游标已关闭")
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except Exception as e:
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print(f"关闭游标时出错：{str(e)}")
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# 关闭连接（允许重复关闭，无需检查是否已关闭）
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if conn:
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try:
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conn.close()
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print("数据库连接已关闭")
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except Exception as e:
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print(f"关闭数据库连接时出错：{str(e)}") |