mirror of
https://gitee.com/houhuan/TrendRadar.git
synced 2025-12-21 19:07:16 +08:00
356 lines
12 KiB
Python
356 lines
12 KiB
Python
"""
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文件解析服务
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提供txt格式新闻数据和YAML配置文件的解析功能。
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"""
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import re
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from pathlib import Path
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from typing import Dict, List, Tuple, Optional
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from datetime import datetime
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import yaml
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from ..utils.errors import FileParseError, DataNotFoundError
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from .cache_service import get_cache
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class ParserService:
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"""文件解析服务类"""
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def __init__(self, project_root: str = None):
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"""
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初始化解析服务
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Args:
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project_root: 项目根目录，默认为当前目录的父目录
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"""
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if project_root is None:
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# 获取当前文件所在目录的父目录的父目录
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current_file = Path(__file__)
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self.project_root = current_file.parent.parent.parent
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else:
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self.project_root = Path(project_root)
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# 初始化缓存服务
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self.cache = get_cache()
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@staticmethod
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def clean_title(title: str) -> str:
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"""
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清理标题文本
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Args:
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title: 原始标题
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Returns:
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清理后的标题
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"""
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# 移除多余空白
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title = re.sub(r'\s+', ' ', title)
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# 移除特殊字符
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title = title.strip()
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return title
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def parse_txt_file(self, file_path: Path) -> Tuple[Dict, Dict]:
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"""
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解析单个txt文件的标题数据
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Args:
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file_path: txt文件路径
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Returns:
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(titles_by_id, id_to_name) 元组
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- titles_by_id: {platform_id: {title: {ranks, url, mobileUrl}}}
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- id_to_name: {platform_id: platform_name}
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Raises:
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FileParseError: 文件解析错误
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"""
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if not file_path.exists():
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raise FileParseError(str(file_path), "文件不存在")
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titles_by_id = {}
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id_to_name = {}
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try:
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with open(file_path, "r", encoding="utf-8") as f:
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content = f.read()
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sections = content.split("\n\n")
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for section in sections:
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if not section.strip() or "==== 以下ID请求失败 ====" in section:
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continue
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lines = section.strip().split("\n")
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if len(lines) < 2:
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continue
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# 解析header: id | name 或 id
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header_line = lines[0].strip()
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if " | " in header_line:
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parts = header_line.split(" | ", 1)
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source_id = parts[0].strip()
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name = parts[1].strip()
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id_to_name[source_id] = name
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else:
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source_id = header_line
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id_to_name[source_id] = source_id
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titles_by_id[source_id] = {}
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# 解析标题行
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for line in lines[1:]:
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if line.strip():
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try:
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title_part = line.strip()
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rank = None
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# 提取排名
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if ". " in title_part and title_part.split(". ")[0].isdigit():
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rank_str, title_part = title_part.split(". ", 1)
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rank = int(rank_str)
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# 提取 MOBILE URL
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mobile_url = ""
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if " [MOBILE:" in title_part:
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title_part, mobile_part = title_part.rsplit(" [MOBILE:", 1)
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if mobile_part.endswith("]"):
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mobile_url = mobile_part[:-1]
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# 提取 URL
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url = ""
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if " [URL:" in title_part:
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title_part, url_part = title_part.rsplit(" [URL:", 1)
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if url_part.endswith("]"):
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url = url_part[:-1]
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title = self.clean_title(title_part.strip())
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ranks = [rank] if rank is not None else [1]
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titles_by_id[source_id][title] = {
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"ranks": ranks,
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"url": url,
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"mobileUrl": mobile_url,
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}
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except Exception as e:
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# 忽略单行解析错误
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continue
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except Exception as e:
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raise FileParseError(str(file_path), str(e))
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return titles_by_id, id_to_name
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def get_date_folder_name(self, date: datetime = None) -> str:
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"""
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获取日期文件夹名称
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Args:
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date: 日期对象，默认为今天
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Returns:
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文件夹名称，格式: YYYY年MM月DD日
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"""
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if date is None:
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date = datetime.now()
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return date.strftime("%Y年%m月%d日")
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def read_all_titles_for_date(
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self,
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date: datetime = None,
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platform_ids: Optional[List[str]] = None
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) -> Tuple[Dict, Dict, Dict]:
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"""
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读取指定日期的所有标题文件（带缓存）
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Args:
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date: 日期对象，默认为今天
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platform_ids: 平台ID列表，None表示所有平台
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Returns:
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(all_titles, id_to_name, all_timestamps) 元组
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- all_titles: {platform_id: {title: {ranks, url, mobileUrl, ...}}}
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- id_to_name: {platform_id: platform_name}
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- all_timestamps: {filename: timestamp}
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Raises:
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DataNotFoundError: 数据不存在
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"""
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# 生成缓存键
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date_str = self.get_date_folder_name(date)
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platform_key = ','.join(sorted(platform_ids)) if platform_ids else 'all'
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cache_key = f"read_all_titles:{date_str}:{platform_key}"
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# 尝试从缓存获取
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# 对于历史数据（非今天），使用更长的缓存时间（1小时）
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# 对于今天的数据，使用较短的缓存时间（15分钟），因为可能有新数据
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is_today = (date is None) or (date.date() == datetime.now().date())
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ttl = 900 if is_today else 3600 # 15分钟 vs 1小时
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cached = self.cache.get(cache_key, ttl=ttl)
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if cached:
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return cached
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# 缓存未命中，读取文件
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date_folder = self.get_date_folder_name(date)
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txt_dir = self.project_root / "output" / date_folder / "txt"
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if not txt_dir.exists():
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raise DataNotFoundError(
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f"未找到 {date_folder} 的数据目录",
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suggestion="请先运行爬虫或检查日期是否正确"
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)
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all_titles = {}
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id_to_name = {}
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all_timestamps = {}
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# 读取所有txt文件
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txt_files = sorted(txt_dir.glob("*.txt"))
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if not txt_files:
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raise DataNotFoundError(
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f"{date_folder} 没有数据文件",
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suggestion="请等待爬虫任务完成"
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)
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for txt_file in txt_files:
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try:
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titles_by_id, file_id_to_name = self.parse_txt_file(txt_file)
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# 更新id_to_name
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id_to_name.update(file_id_to_name)
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# 合并标题数据
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for platform_id, titles in titles_by_id.items():
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# 如果指定了平台过滤
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if platform_ids and platform_id not in platform_ids:
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continue
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if platform_id not in all_titles:
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all_titles[platform_id] = {}
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for title, info in titles.items():
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if title in all_titles[platform_id]:
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# 合并排名
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all_titles[platform_id][title]["ranks"].extend(info["ranks"])
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else:
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all_titles[platform_id][title] = info.copy()
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# 记录文件时间戳
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all_timestamps[txt_file.name] = txt_file.stat().st_mtime
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except Exception as e:
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# 忽略单个文件的解析错误，继续处理其他文件
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print(f"Warning: 解析文件 {txt_file} 失败: {e}")
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continue
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if not all_titles:
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raise DataNotFoundError(
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f"{date_folder} 没有有效的数据",
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suggestion="请检查数据文件格式或重新运行爬虫"
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)
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# 缓存结果
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result = (all_titles, id_to_name, all_timestamps)
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self.cache.set(cache_key, result)
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return result
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def parse_yaml_config(self, config_path: str = None) -> dict:
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"""
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解析YAML配置文件
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Args:
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config_path: 配置文件路径，默认为 config/config.yaml
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Returns:
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配置字典
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Raises:
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FileParseError: 配置文件解析错误
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"""
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if config_path is None:
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config_path = self.project_root / "config" / "config.yaml"
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else:
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config_path = Path(config_path)
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if not config_path.exists():
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raise FileParseError(str(config_path), "配置文件不存在")
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try:
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with open(config_path, "r", encoding="utf-8") as f:
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config_data = yaml.safe_load(f)
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return config_data
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except Exception as e:
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raise FileParseError(str(config_path), str(e))
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def parse_frequency_words(self, words_file: str = None) -> List[Dict]:
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"""
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解析关键词配置文件
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Args:
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words_file: 关键词文件路径，默认为 config/frequency_words.txt
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Returns:
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词组列表
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Raises:
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FileParseError: 文件解析错误
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"""
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if words_file is None:
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words_file = self.project_root / "config" / "frequency_words.txt"
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else:
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words_file = Path(words_file)
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if not words_file.exists():
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return []
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word_groups = []
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try:
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with open(words_file, "r", encoding="utf-8") as f:
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for line in f:
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line = line.strip()
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if not line or line.startswith("#"):
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continue
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# 使用 | 分隔符
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parts = [p.strip() for p in line.split("|")]
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if not parts:
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continue
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group = {
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"required": [],
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"normal": [],
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"filter_words": []
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}
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for part in parts:
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if not part:
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continue
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words = [w.strip() for w in part.split(",")]
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for word in words:
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if not word:
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continue
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if word.endswith("+"):
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# 必须词
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group["required"].append(word[:-1])
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elif word.endswith("!"):
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# 过滤词
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group["filter_words"].append(word[:-1])
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else:
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# 普通词
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group["normal"].append(word)
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if group["required"] or group["normal"]:
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word_groups.append(group)
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except Exception as e:
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raise FileParseError(str(words_file), str(e))
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return word_groups
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