refactor(book_service): 重构书籍服务以使用Pathlib路径处理

- 移除os模块导入，改用pathlib.Path进行路径操作
- 添加find_project_root工具函数用于查找项目根目录
- 将文件夹创建方法重构为使用Path对象的create_folder函数
- 更新下载路径构建方式，使用pathlib路径拼接替代os.path.join
- 优化download_file方法，改进异常处理和内容类型检查逻辑
- 修改get_post_date方法为静态方法，提升代码结构清晰度

app/services/book_service.py

@@ -1,10 +1,9 @@
-import os
 import requests
 from pathlib import Path
 from bs4 import BeautifulSoup
 from app.extensions import db
 from tenacity import retry, stop_after_attempt, RetryError
-from app.utils import datetime_to_timestamp, timestamp_to_datetime, get_today_timestamp
+from app.utils import datetime_to_timestamp, timestamp_to_datetime, get_today_timestamp, find_project_root
 from app.models import Setting
 
 
@@ -22,8 +21,9 @@ class BookService:
         target_ts = datetime_to_timestamp(self.setting["targetDate"]) - 24 * 60 * 60
         self.setting["targetDate"] = timestamp_to_datetime(target_ts)
 
-        app_dir = os.path.dirname(os.path.dirname(__file__))
-        self.download_path = os.path.join(os.path.dirname(app_dir), "download")  # 下载目录
+        app_dir = find_project_root()
+        print(app_dir)
+        self.download_path = app_dir.parent / "download"  # 下载目录
         self.today_timestamp = get_today_timestamp()
         self.one_date_loading = False
         self.session = requests.session()
@@ -54,16 +54,11 @@ class BookService:
             name = name.replace(old, new)
         return name
 
-    def create_folder(self, target_dir, name):  # 创建文件夹
-        real_dir = os.path.join(target_dir, name)
-        folder = os.path.exists(real_dir)
-        if not folder:
-            os.makedirs(real_dir)
-        else:
-            print(f"文件夹：{name} 已存在")
-
-    def isDownloadTarget(self, soup):  # 是否是可以下载的文件
-        return soup.headers.get('Content-Type') in self.ALLOWED_CONTENT_TYPES
+    def create_folder(self, parent_dir: Path, folder_name: str) -> Path: # 创建文件夹
+        """创建文件夹（如果不存在）并返回路径"""
+        target = parent_dir / folder_name
+        target.mkdir(parents=True, exist_ok=True)
+        return target
 
     def post_page(self, name, url):  # 帖子页面
         print(f"详情页面 {self.setting["baseUrl"]}{url}")
@@ -73,7 +68,7 @@ class BookService:
         soup = BeautifulSoup(response.text, 'lxml')
         resource_boxs = soup.select('ignore_js_op')
         for i in resource_boxs:
-            download_dir_path = os.path.join(self.download_path, self.setting["targetDate"])
+            download_dir_path = self.download_path / self.setting["targetDate"]
             self.create_folder(download_dir_path, name)
             try:
                 for string in i.select_one(".tip.tip_4").stripped_strings:
@@ -89,20 +84,26 @@ class BookService:
                 print('重试三次也不成功')
 
     @retry(stop=stop_after_attempt(3))
-    def download_file(self, file_url, dir_name, file_name):  # 下载文件
+    def download_file(self, file_url: str, dir_name: str, file_name: str):  # 下载文件
+        try:
             response = self.session.get(file_url, stream=True)
             response.raise_for_status()
             print(f"下载状态码：{response.status_code} {file_url}")
             print(dir_name + "/" + file_name)
-        if self.isDownloadTarget(response):
-            with open(f"download/{self.setting["targetDate"]}/{dir_name}/{file_name}", 'wb') as file2:
-                for chunk in response.iter_content(chunk_size=1024):
-                    if chunk:
-                        file2.write(chunk)
-            yield f"data: {self.setting["targetDate"]} {file_name}\n\n"
-        else:
+            content_type = response.headers.get('Content-Type', '')
+            if content_type not in self.ALLOWED_CONTENT_TYPES:
                 yield f"event: mes_error\ndata: {self.setting["targetDate"]} {file_name}\n\n"
                 print("不是可下载文件")
+                return
+            target_dir = f"download/{self.setting["targetDate"]}/{dir_name}/{file_name}"
+            with open(target_dir, 'wb') as f:
+                for chunk in response.iter_content(chunk_size=1024):
+                    if chunk:
+                        f.write(chunk)
+            yield f"data: {self.setting["targetDate"]} {file_name}\n\n"
+        except requests.RequestException as e:
+            yield f"event: error\ndata: {self.setting['targetDate']} {file_name} 网络错误\n\n"
+            raise  # 触发 tenacity 重试
 
     def section_page(self, page):  # 版块页面
         print(f"当前页面 {page}")
@@ -169,12 +170,17 @@ class BookService:
             yield from self.section_page(self.setting["totalPage"] - self.setting["targetCountdownPage"])
         return None
 
-    def get_post_date(self, element):
-        if element.select_one(".by em span span"):
-            if element.select_one(".by em span span").get("title"):
-                return element.select_one(".by em span span").get("title")
+    # ------------------------------------------------------------
+    # 获取帖子发布时间
+    # ------------------------------------------------------------
+    @staticmethod
+    def get_post_date(element):
+        span_span = element.select_one(".by em span span")
+        if span_span:
+            if span_span.get("title"):
+                return span_span.get("title")
             else:
-                return element.select_one(".by em span span").string
+                return span_span.string
         else:
             return element.select_one(".by em span").string
 

app/utils/__init__.py

@@ -2,6 +2,7 @@ import json
 import time
 import ctypes
 from collections import defaultdict
+from pathlib import Path
 from typing import List
 from datetime import datetime
 from functools import cmp_to_key
@@ -104,3 +105,10 @@ def to_json_serializable(obj):
         return list(obj)   # 集合转列表
     # 其他基本类型（str, int, float, list, tuple, None）直接返回
     return obj
+
+def find_project_root(marker_files=('requirements.txt', 'run.py')):
+    current = Path(__file__).resolve().parent
+    for parent in current.parents:
+        if any((parent / marker).exists() for marker in marker_files):
+            return parent
+    return current  # 没找到则返回当前文件所在目录