初始化提交

backend/app/services/goal_persist.py

@@ -0,0 +1,92 @@
+"""会话目标自动持久化服务。
+
+从用户消息自动持久化会话目标到 goals 表。
+如果已有该 character 的活跃 session 级目标，判断内容是否显著不同：
+- 内容相似 → 复用
+- 内容不同 → 完成旧目标，创建新目标
+"""
+
+from app.models.governance import Goal
+from app.repositories import governance as governance_repo
+
+_TOPIC_SHIFT_MIN_LENGTH = 20
+
+
+async def auto_persist_session_goal(
+    session,
+    character_id: str,
+    content: str,
+) -> Goal | None:
+    """自动持久化会话目标：复用活跃的 session 目标或新建。
+
+    内容过短（<10 字）不产生目标。
+    如果已有活跃 session 目标但内容显著不同，先完成旧目标再新建。
+
+    Returns:
+        持久化后的 Goal（可能为 None）。
+    """
+    goal_text = (content or "").strip()
+    if not goal_text or len(goal_text) < 10:
+        return None
+
+    existing = await governance_repo.list_active_session_goal(session, character_id)
+    if existing is not None:
+        # 判断是否话题转换：内容不再相似时完成旧目标
+        if _is_topic_shift(existing.title, goal_text):
+            existing.status = "completed"
+            existing.progress = 1.0
+            # 创建新目标
+            goal = Goal(
+                character_id=character_id,
+                title=goal_text[:120],
+                description=f"从对话自动提取的会话目标：{goal_text[:500]}",
+                level="session",
+                type="mission",
+                status="active",
+                priority=50,
+            )
+            await governance_repo.add_goal(session, goal)
+            return goal
+        return existing
+
+    # 新建 session 目标
+    goal = Goal(
+        character_id=character_id,
+        title=goal_text[:120],
+        description=f"从对话自动提取的会话目标：{goal_text[:500]}",
+        level="session",
+        type="mission",
+        status="active",
+        priority=50,
+    )
+    await governance_repo.add_goal(session, goal)
+    return goal
+
+
+def _is_topic_shift(existing_title: str, new_content: str) -> bool:
+    """判断新内容与旧目标标题是否话题转换。
+
+    简单规则：如果新内容较长且与旧标题共享的关键词很少，视为话题转换。
+    这是启发式方法，后续可升级为 LLM 判断。
+    """
+    if len(new_content) < _TOPIC_SHIFT_MIN_LENGTH:
+        return False
+    # 提取关键词集合（按空格/标点分割）
+    import re
+    old_words = set(re.split(r"[\s，。！？、；：,\.!?;:]+", existing_title.lower()))
+    new_words = set(re.split(r"[\s，。！？、；：,\.!?;:]+", new_content.lower()))
+    # 排除常见的助词
+    stop_words = {"的", "了", "是", "在", "有", "和", "就", "不", "人", "都", "一",
+                  "一个", "上", "也", "很", "到", "说", "要", "去", "你", "我", "他",
+                  "这", "那", "吗", "啊", "呢", "吧", "地", "得"}
+    old_keywords = old_words - stop_words
+    new_keywords = new_words - stop_words
+
+    if not old_keywords or not new_keywords:
+        return False
+
+    overlap = old_keywords & new_keywords
+    # 如果旧关键词的一个都没有出现在新内容中，或者重合率极低
+    if not overlap:
+        return True
+    return len(overlap) / max(len(old_keywords), len(new_keywords)) < 0.15