503 lines
17 KiB
Python
503 lines
17 KiB
Python
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"""
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File-based Auto-Memory System — MEMORY.md + 4-Type Classification
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参考 Claude Code src/memdir/ 设计：
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- 4 种封闭记忆类型: user / feedback / project / reference
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- YAML frontmatter 格式
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- MEMORY.md 索引文件
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- 陈旧度感知
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- 文件系统存储（人类可读、可版本控制）
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"""
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from __future__ import annotations
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import os
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import re
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import time
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import yaml
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import logging
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from dataclasses import dataclass, field
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from enum import Enum
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from typing import Any, Dict, List, Optional, Tuple
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logger = logging.getLogger(__name__)
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# ════════════════════ 记忆类型定义 ════════════════════
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class MemoryType(str, Enum):
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"""4 种封闭记忆类型 — 参考 Claude Code MEMORY_TYPES"""
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USER = "user" # 用户角色/偏好/知识
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FEEDBACK = "feedback" # 行为规范（附 Why + How to apply）
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PROJECT = "project" # 项目上下文/目标/进度
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REFERENCE = "reference" # 外部系统指针
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# ════════════════════ 数据结构 ════════════════════
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@dataclass
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class MemoryEntry:
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"""单个记忆文件"""
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filename: str # 文件名 (不含路径)
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filepath: str # 绝对路径
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name: str # frontmatter name
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description: str # frontmatter description — 用于后续相关性判断
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mem_type: MemoryType # frontmatter type
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mtime: float # 修改时间 (epoch seconds)
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content: str = "" # 正文内容（延迟加载）
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@property
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def age_days(self) -> int:
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"""记忆年龄（天）"""
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return max(0, int((time.time() - self.mtime) / 86400))
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@property
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def age_text(self) -> str:
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"""人类可读的年龄描述"""
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days = self.age_days
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if days == 0:
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return "今天"
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if days == 1:
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return "昨天"
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return f"{days} 天前"
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@property
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def is_stale(self) -> bool:
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"""超过 1 天即为陈旧"""
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return self.age_days > 1
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@property
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def staleness_note(self) -> Optional[str]:
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"""如果陈旧，返回提醒文本"""
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if not self.is_stale:
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return None
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return (
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f"⚠️ 此记忆已保存 {self.age_text}。"
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"记忆是时间点的快照，不是实时状态 —— 关于代码行为或文件位置的断言可能已过时。"
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"请先验证再据此操作。"
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)
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@dataclass
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class MemoryManifest:
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"""记忆目录清单"""
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entries: List[MemoryEntry] = field(default_factory=list)
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index_lines: List[str] = field(default_factory=list) # MEMORY.md 原始行
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total_files: int = 0
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index_truncated: bool = False # MEMORY.md 是否被截断
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# ════════════════════ Frontmatter 解析 ════════════════════
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FRONTMATTER_RE = re.compile(r'^---\s*\n([\s\S]*?)---\s*\n?')
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MAX_FRONTMATTER_LINES = 30
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def parse_frontmatter(text: str) -> Tuple[Dict[str, Any], str]:
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"""解析 YAML frontmatter。返回 (frontmatter_dict, body_text)。"""
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m = FRONTMATTER_RE.match(text)
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if not m:
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return {}, text
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fm_text = m.group(1)
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body = text[m.end():]
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try:
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fm = yaml.safe_load(fm_text) or {}
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except yaml.YAMLError:
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logger.debug("Frontmatter YAML 解析失败")
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return {}, text
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return fm if isinstance(fm, dict) else {}, body
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def parse_memory_type(raw: Any) -> Optional[MemoryType]:
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"""校验并转换记忆类型为闭集值。"""
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if raw is None:
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return None
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try:
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return MemoryType(str(raw).lower())
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except ValueError:
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return None
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# ════════════════════ 提示词模板 ════════════════════
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MEMORY_TYPES_PROMPT = """## 记忆类型
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你可以将信息保存为以下 4 种类型的记忆文件（`.md` 格式，带 YAML frontmatter）：
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<type>
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<name>user</name>
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<description>用户角色、目标、职责和知识。好的 user 记忆帮助你为特定用户定制行为。</description>
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<example>用户是资深 Go 开发者，刚接触此项目的 React 前端</example>
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</type>
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<type>
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<name>feedback</name>
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<description>用户给出的行为指导 —— 什么该做、什么不该做。</description>
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<body_structure>
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以规则本身开头，然后是 **Why:** 行（原因）和 **How to apply:** 行（适用范围）。
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</body_structure>
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<example>集成测试必须使用真实数据库，不要 mock。Why: 上次 mock 通过但生产迁移失败。How to apply: 所有涉及 ORM 的测试。</example>
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</type>
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<type>
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<name>project</name>
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<description>项目上下文 —— 谁在做什么、为什么、截止时间。项目记忆衰减快，需要保持更新。</description>
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<body_structure>
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以事实或决策开头，然后是 **Why:** 行（约束、截止日期、需求方）和 **How to apply:** 行（如何影响建议）。
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</body_structure>
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<example>周四后冻结所有非关键合并 (2026-03-05)。Why: 移动端发布分支切出。How to apply: 标记该日期后的 PR 工作。</example>
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</type>
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<type>
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<name>reference</name>
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<description>外部系统信息指针 —— Bug 追踪、文档、监控面板的位置。</description>
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<example>流水线 Bug 追踪在 Linear 项目 "INGEST" 中</example>
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</type>
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## 什么不应该保存为记忆
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- 代码模式、约定、架构 —— 可通过阅读项目代码得出
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- Git 历史、最近变更 —— `git log` / `git blame` 是权威来源
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- 调试方案、修复思路 —— 修复已在代码中，commit message 有上下文
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- CLAUDE.md 已记录的内容
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- 临时任务细节：进行中的工作、当前对话状态
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**这些排除规则即使在用户明确要求保存时也适用。** 如果用户要求保存以上内容，先询问其中什么是*意外的*或*非显而易见的*部分。
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## 何时访问记忆
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- 当记忆与当前任务可能相关时
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- 用户提及之前的对话或工作
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- 用户明确要求检查、回忆或记住时
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## 信任但验证
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- 命名特定函数/文件/标志的记忆是该信息*写入时*存在的主张
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- 在据此推荐之前：检查文件是否存在、grep 函数是否存在
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- 当前代码 > 过时记忆"""
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MEMORY_SAVE_INSTRUCTIONS = """## 如何保存记忆
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保存记忆是两步操作：
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**第 1 步** — 将记忆写入独立文件，使用以下 frontmatter 格式：
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```markdown
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---
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name: {{简短标题}}
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description: {{一行描述 — 用于未来判断相关性，尽量具体}}
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type: {{user / feedback / project / reference}}
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---
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{{记忆内容}}
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```
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文件命名使用语义化英文 slug（如 `user_golang_expert.md`）。
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**第 2 步** — 在 MEMORY.md 中添加索引行。MEMORY.md 是索引，每条一行约 150 字符以内：
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`- [标题](文件名.md) — 一行摘要`
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- MEMORY.md 超过 200 行后会被截断，请保持索引简洁
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- 按主题组织，不按时间
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- 更新或删除错误的记忆
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- 写入前先检查是否已有类似记忆可以更新"""
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MEMORY_LOAD_INSTRUCTIONS = """## 记忆加载
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会话启动时会自动加载 MEMORY.md 索引和相关记忆文件。你可以使用文件读取工具查看具体的记忆文件内容。
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如果用户说 *忽略* 或 *不使用记忆*：当作 MEMORY.md 不存在。不要提及或引用记忆内容。
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记忆会随时间的推移而变陈旧。如果一个记忆与当前观察（代码、文件系统）冲突，以当前观察为准，并更新过时的记忆。"""
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# ════════════════════ 记忆目录管理 ════════════════════
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class MemoryDir:
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"""
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基于文件系统的自动记忆目录。
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目录结构:
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<base_dir>/
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├── MEMORY.md # 索引文件
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├── user_*.md # user 类型记忆
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├── feedback_*.md # feedback 类型记忆
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├── project_*.md # project 类型记忆
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└── reference_*.md # reference 类型记忆
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用法:
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md = MemoryDir("/path/to/memory")
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manifest = md.scan()
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prompt = md.build_system_prompt()
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md.save_memory("user_golang_expert", MemoryType.USER,
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"用户是资深 Go 开发者",
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"用户有 10 年 Go 经验，但刚接触 React...")
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"""
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ENTRYPOINT = "MEMORY.md"
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MAX_INDEX_LINES = 200
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MAX_INDEX_BYTES = 25_000
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MAX_SCAN_FILES = 200
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MAX_FRONTMATTER_READ_BYTES = 4096 # 只读前 4KB 用于扫描
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def __init__(self, base_dir: str):
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self.base_dir = os.path.abspath(base_dir)
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os.makedirs(self.base_dir, exist_ok=True)
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@property
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def index_path(self) -> str:
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return os.path.join(self.base_dir, self.ENTRYPOINT)
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# ── 扫描 ──
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def scan(self, load_content: bool = False) -> MemoryManifest:
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"""
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扫描记忆目录，提取所有 .md 文件的 frontmatter。
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Returns:
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MemoryManifest 包含所有有效记忆条目和索引行
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"""
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entries: List[MemoryEntry] = []
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index_lines: List[str] = []
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index_truncated = False
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# 读取 MEMORY.md 索引
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if os.path.exists(self.index_path):
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try:
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with open(self.index_path, "r", encoding="utf-8") as f:
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raw = f.read(self.MAX_INDEX_BYTES)
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all_lines = raw.split("\n")
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index_lines = all_lines[:self.MAX_INDEX_LINES]
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if len(all_lines) > self.MAX_INDEX_LINES:
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index_truncated = True
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# 读取是否被截断
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if len(raw.encode("utf-8")) >= self.MAX_INDEX_BYTES:
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index_truncated = True
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except Exception as e:
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logger.warning("读取 MEMORY.md 失败: %s", e)
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# 扫描所有 .md 文件（排除 MEMORY.md）
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try:
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filenames = sorted(
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[f for f in os.listdir(self.base_dir)
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if f.endswith(".md") and f != self.ENTRYPOINT],
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key=lambda f: os.path.getmtime(os.path.join(self.base_dir, f)),
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reverse=True,
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)[:self.MAX_SCAN_FILES]
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except OSError:
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filenames = []
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for fn in filenames:
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fp = os.path.join(self.base_dir, fn)
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try:
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mtime = os.path.getmtime(fp)
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# 只读 frontmatter 部分
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with open(fp, "r", encoding="utf-8") as f:
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head = f.read(self.MAX_FRONTMATTER_READ_BYTES)
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fm, body = parse_frontmatter(head)
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mem_type = parse_memory_type(fm.get("type"))
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if mem_type is None:
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continue # 跳过无有效类型的文件
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name = fm.get("name", fn.replace(".md", "").replace("_", " ").title())
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description = fm.get("description", "")
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content = ""
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if load_content:
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# 已读取的 head 可能不完整，重新全量读取
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try:
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with open(fp, "r", encoding="utf-8") as f:
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full = f.read()
|
|||
|
|
_, content = parse_frontmatter(full)
|
|||
|
|
except Exception:
|
|||
|
|
pass
|
|||
|
|
|
|||
|
|
entries.append(MemoryEntry(
|
|||
|
|
filename=fn,
|
|||
|
|
filepath=fp,
|
|||
|
|
name=name,
|
|||
|
|
description=description,
|
|||
|
|
mem_type=mem_type,
|
|||
|
|
mtime=mtime,
|
|||
|
|
content=content,
|
|||
|
|
))
|
|||
|
|
except Exception as e:
|
|||
|
|
logger.debug("扫描记忆文件失败: %s (%s)", fn, e)
|
|||
|
|
|
|||
|
|
return MemoryManifest(
|
|||
|
|
entries=entries,
|
|||
|
|
index_lines=index_lines,
|
|||
|
|
total_files=len(entries),
|
|||
|
|
index_truncated=index_truncated,
|
|||
|
|
)
|
|||
|
|
|
|||
|
|
# ── 加载索引内容 ──
|
|||
|
|
|
|||
|
|
def load_index(self) -> str:
|
|||
|
|
"""读取 MEMORY.md 的完整内容（截断到限制）。"""
|
|||
|
|
if not os.path.exists(self.index_path):
|
|||
|
|
return ""
|
|||
|
|
try:
|
|||
|
|
with open(self.index_path, "r", encoding="utf-8") as f:
|
|||
|
|
raw = f.read(self.MAX_INDEX_BYTES)
|
|||
|
|
lines = raw.split("\n")[:self.MAX_INDEX_LINES]
|
|||
|
|
truncated = "\n".join(lines)
|
|||
|
|
if len(truncated.encode("utf-8")) < len(raw.encode("utf-8")) or len(lines) < len(raw.split("\n")):
|
|||
|
|
truncated += f"\n\n<!-- MEMORY.md 已截断（>{self.MAX_INDEX_LINES} 行或 >{self.MAX_INDEX_BYTES // 1000}KB） -->"
|
|||
|
|
return truncated
|
|||
|
|
except Exception as e:
|
|||
|
|
logger.error("读取 MEMORY.md 失败: %s", e)
|
|||
|
|
return ""
|
|||
|
|
|
|||
|
|
# ── 保存 ──
|
|||
|
|
|
|||
|
|
def save_memory(
|
|||
|
|
self,
|
|||
|
|
filename: str,
|
|||
|
|
mem_type: MemoryType,
|
|||
|
|
name: str,
|
|||
|
|
description: str,
|
|||
|
|
content: str,
|
|||
|
|
) -> str:
|
|||
|
|
"""
|
|||
|
|
保存一条记忆。
|
|||
|
|
|
|||
|
|
1. 写入 .md 文件（带 frontmatter）
|
|||
|
|
2. 更新 MEMORY.md 索引
|
|||
|
|
|
|||
|
|
Returns:
|
|||
|
|
写入的文件绝对路径
|
|||
|
|
"""
|
|||
|
|
# 安全检查
|
|||
|
|
safe_name = os.path.basename(filename)
|
|||
|
|
if not safe_name.endswith(".md"):
|
|||
|
|
safe_name += ".md"
|
|||
|
|
if safe_name == self.ENTRYPOINT:
|
|||
|
|
raise ValueError(f"不能覆盖 {self.ENTRYPOINT}")
|
|||
|
|
|
|||
|
|
filepath = os.path.join(self.base_dir, safe_name)
|
|||
|
|
|
|||
|
|
# 构建 frontmatter
|
|||
|
|
fm = {
|
|||
|
|
"name": name,
|
|||
|
|
"description": description,
|
|||
|
|
"type": mem_type.value,
|
|||
|
|
}
|
|||
|
|
fm_yaml = yaml.dump(fm, allow_unicode=True, default_flow_style=False).strip()
|
|||
|
|
|
|||
|
|
full_content = f"---\n{fm_yaml}\n---\n\n{content}"
|
|||
|
|
|
|||
|
|
with open(filepath, "w", encoding="utf-8") as f:
|
|||
|
|
f.write(full_content)
|
|||
|
|
|
|||
|
|
logger.info("记忆已保存: %s (type=%s)", safe_name, mem_type.value)
|
|||
|
|
|
|||
|
|
# 更新索引
|
|||
|
|
self._update_index(safe_name, description)
|
|||
|
|
|
|||
|
|
return filepath
|
|||
|
|
|
|||
|
|
def _update_index(self, filename: str, description: str):
|
|||
|
|
"""在 MEMORY.md 中添加或更新索引行。"""
|
|||
|
|
index_line = f"- [{filename.replace('.md', '')}]({filename}) — {description[:100]}"
|
|||
|
|
|
|||
|
|
existing_lines: List[str] = []
|
|||
|
|
if os.path.exists(self.index_path):
|
|||
|
|
try:
|
|||
|
|
with open(self.index_path, "r", encoding="utf-8") as f:
|
|||
|
|
existing_lines = f.read().split("\n")
|
|||
|
|
except Exception:
|
|||
|
|
pass
|
|||
|
|
|
|||
|
|
# 检查是否已有此文件的索引行
|
|||
|
|
updated = False
|
|||
|
|
for i, line in enumerate(existing_lines):
|
|||
|
|
if f"]({filename})" in line:
|
|||
|
|
existing_lines[i] = index_line
|
|||
|
|
updated = True
|
|||
|
|
break
|
|||
|
|
|
|||
|
|
if not updated:
|
|||
|
|
existing_lines.append(index_line)
|
|||
|
|
|
|||
|
|
# 截断
|
|||
|
|
if len(existing_lines) > self.MAX_INDEX_LINES:
|
|||
|
|
existing_lines = existing_lines[-self.MAX_INDEX_LINES:]
|
|||
|
|
logger.warning("MEMORY.md 已截断到 %d 行", self.MAX_INDEX_LINES)
|
|||
|
|
|
|||
|
|
with open(self.index_path, "w", encoding="utf-8") as f:
|
|||
|
|
f.write("\n".join(existing_lines))
|
|||
|
|
|
|||
|
|
logger.info("MEMORY.md 索引已更新: %s", filename)
|
|||
|
|
|
|||
|
|
def delete_memory(self, filename: str) -> bool:
|
|||
|
|
"""删除一条记忆文件并从索引中移除。"""
|
|||
|
|
safe_name = os.path.basename(filename)
|
|||
|
|
filepath = os.path.join(self.base_dir, safe_name)
|
|||
|
|
|
|||
|
|
if not os.path.exists(filepath):
|
|||
|
|
return False
|
|||
|
|
|
|||
|
|
os.remove(filepath)
|
|||
|
|
logger.info("记忆文件已删除: %s", safe_name)
|
|||
|
|
|
|||
|
|
# 从索引中移除
|
|||
|
|
if os.path.exists(self.index_path):
|
|||
|
|
try:
|
|||
|
|
with open(self.index_path, "r", encoding="utf-8") as f:
|
|||
|
|
lines = f.read().split("\n")
|
|||
|
|
lines = [l for l in lines if f"]({safe_name})" not in l]
|
|||
|
|
with open(self.index_path, "w", encoding="utf-8") as f:
|
|||
|
|
f.write("\n".join(lines))
|
|||
|
|
except Exception as e:
|
|||
|
|
logger.warning("更新 MEMORY.md 索引失败: %s", e)
|
|||
|
|
|
|||
|
|
return True
|
|||
|
|
|
|||
|
|
# ── 格式化清单 ──
|
|||
|
|
|
|||
|
|
def format_manifest(self, manifest: MemoryManifest) -> str:
|
|||
|
|
"""将记忆清单格式化为 LLM 可用的文本（用于相关性选择）。"""
|
|||
|
|
if not manifest.entries:
|
|||
|
|
return "（无已有记忆）"
|
|||
|
|
|
|||
|
|
lines = []
|
|||
|
|
for e in manifest.entries:
|
|||
|
|
ts = time.strftime("%Y-%m-%d %H:%M", time.localtime(e.mtime))
|
|||
|
|
lines.append(
|
|||
|
|
f"- [{e.mem_type.value}] {e.filename} ({ts}): {e.description or '(无描述)'}"
|
|||
|
|
)
|
|||
|
|
return "\n".join(lines)
|
|||
|
|
|
|||
|
|
# ── 构建系统提示词 ──
|
|||
|
|
|
|||
|
|
def build_system_prompt(self) -> str:
|
|||
|
|
"""
|
|||
|
|
构建注入 system prompt 的记忆模块。
|
|||
|
|
|
|||
|
|
包含：
|
|||
|
|
1. 记忆类型和保存指导
|
|||
|
|
2. MEMORY.md 索引内容
|
|||
|
|
3. 相关性提醒
|
|||
|
|
"""
|
|||
|
|
parts = [
|
|||
|
|
MEMORY_TYPES_PROMPT,
|
|||
|
|
"",
|
|||
|
|
MEMORY_SAVE_INSTRUCTIONS,
|
|||
|
|
"",
|
|||
|
|
MEMORY_LOAD_INSTRUCTIONS,
|
|||
|
|
]
|
|||
|
|
|
|||
|
|
# 注入 MEMORY.md 内容
|
|||
|
|
index_content = self.load_index()
|
|||
|
|
if index_content:
|
|||
|
|
parts.append("\n## 已有记忆 (MEMORY.md)\n")
|
|||
|
|
parts.append(index_content)
|
|||
|
|
|
|||
|
|
parts.append(f"\n记忆目录: `{self.base_dir}`")
|
|||
|
|
parts.append("（目录已存在，请直接使用）")
|
|||
|
|
|
|||
|
|
return "\n".join(parts)
|