55cfbc7f80
Two complementary changes to reduce conversation cold-start friction: A. Returning-user re-greeting (backend) - When WS reconnects to a non-empty conversation and last_message_at is older than chat_re_greeting_idle_hours (default 6h), the agent emits a warm continuation message that references prior history instead of staying silent. - Self-debouncing: the AI message updates last_message_at, so reconnects within the window will not re-trigger. - Skipped while profile collection is still pending. D. Topic suggestion chips (backend + Expo) - New WS message type topic_suggestions carries 3-4 quick-start chips derived from the current memoir stage's empty slots (deterministic, no extra LLM cost). Sent alongside opening / re-greeting / resume. - Expo chat screen renders a horizontally-scrollable chip row above the input bar; tapping a chip sends the chip's text as a user message and clears the row. Sending any text/voice also clears the chips.
622 lines
26 KiB
Python
622 lines
26 KiB
Python
"""
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InterviewAgent：正式访谈 Specialist
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负责状态感知回复、开场白，不负责 Redis 持久化（由 Orchestrator 统一处理）
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"""
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import time
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from typing import Any, List, Optional
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from langchain_core.messages import HumanMessage, SystemMessage
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from app.agents.chat.agent_turn import AgentChatTurn
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from app.agents.chat.helpers import format_history_string, get_history_with_window
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from app.agents.chat.interview_state_hints import (
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apply_autobiographical_boundary_guard,
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apply_duplicate_question_guard,
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extract_recent_questions,
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segments_are_only_duplicate_guard_fallback,
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update_recent_questions,
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)
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from app.agents.chat.interview_turn_plan import plan_interview_turn
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from app.agents.chat.personas import normalize_interview_persona
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from app.agents.chat.prompt_context import ChatPromptContext
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from app.agents.chat.prompts_conversation import (
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SLOT_NAME_MAP,
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get_opening_prompt,
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get_re_greeting_prompt,
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)
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from app.agents.chat.reply_limits import (
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nonempty_segments_or_fallback,
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segments_from_llm_response,
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truncate_chat_segments,
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)
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from app.agents.chat.reply_planner import maybe_refine_turn_plan_with_llm
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from app.agents.chat.stage_detection import keyword_fallback_primary_stage
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from app.agents.state_schema import (
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MemoirStateSchema,
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interview_control_state,
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narrative_coverage_state,
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)
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from app.core.agent_logging import (
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agent_span,
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log_agent_payload,
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log_agent_summary,
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)
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from app.core.config import settings
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from app.core.llm_gateway import LlmGateway, LlmUseCase
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from app.core.logging import get_logger
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from app.features.conversation.input_normalize import normalize_chat_input_for_agent
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logger = get_logger(__name__)
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# LLM 不可用或调用失败时对用户展示（不暴露异常细节、不触发 TTS）
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_FALLBACK_REPLY = "刚才网络不太稳，没接上。你可以再说一遍，或稍后再试。"
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# 仅在「重复问句守卫」把正文削成单句兜底时追加二次 system，只多调一次模型。
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_DUPLICATE_GUARD_LLM_RETRY_SYSTEM_APPENDIX = """## 二次生成（纠偏）
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上一版模型输出因包含与「最近已问过的问题」或「已确认事实」重复的问句，已被系统弃用。请**重新写一整条回复**：
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- 仍须遵守上文全部主规则；
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- 先贴着用户本轮原话承接半句到一两句（可有画面感）；
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- **禁止**再用与刚才同义、仅换说法的确认型问句；
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- 若要提问，须换**全新角度**，并锚在用户刚说的具体细节里；也可以本轮**完全不提问**，只并肩承接；
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- **禁止**整段只有「这一段我记住了」或同类无信息套话。"""
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def _finalize_chat_segments_after_llm(
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response_text: str,
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*,
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max_segments: int,
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max_chars: int,
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memoir_state: MemoirStateSchema,
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recent_questions: list[str],
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) -> tuple[list[str], bool]:
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raw_list = segments_from_llm_response(
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response_text,
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max_segments=max_segments,
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)
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if not raw_list:
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raw_list = [response_text.strip()]
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out = truncate_chat_segments(
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raw_list,
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max_segments=max_segments,
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max_chars_per_segment=max_chars,
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)
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if not out:
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out = [response_text.strip()[:max_chars]]
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out = nonempty_segments_or_fallback(out, fallback=_FALLBACK_REPLY)
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out, deduped = apply_duplicate_question_guard(
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out,
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state=memoir_state,
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recent_questions=recent_questions,
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)
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return out, deduped
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def _get_langchain_llm():
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try:
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return LlmGateway().langchain_llm_for(LlmUseCase("chat.interview"))
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except Exception:
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return None
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def _message_contents_char_count(messages: List[Any]) -> int:
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n = 0
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for m in messages:
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c = getattr(m, "content", None)
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if isinstance(c, str):
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n += len(c)
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return n
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class InterviewAgent:
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"""正式访谈 Specialist Agent"""
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def __init__(self):
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self.llm = _get_langchain_llm()
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def _detect_user_stage(self, user_message: str) -> str:
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"""关键词回退：与 stage_detection 一致（多阶段打分）。"""
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return keyword_fallback_primary_stage(user_message)
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def _resolve_text_for_model(
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self,
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user_message: str,
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normalized_user_message: Optional[str],
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) -> str:
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"""模型侧净稿：编排层已归一则直接用；否则在本层补一次（含可选 LLM）。"""
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if normalized_user_message is not None:
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return (normalized_user_message or "").strip()
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llm_n = None
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if settings.chat_input_normalize_enabled and (
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(settings.chat_input_normalize_mode or "").strip().lower() == "llm"
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):
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llm_n = self.llm
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return normalize_chat_input_for_agent(user_message or "", llm=llm_n)
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async def generate_response_with_state(
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self,
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conversation_id: str,
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user_message: str,
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memoir_state: MemoirStateSchema,
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user_profile_context: str = "",
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detected_user_stage: Optional[str] = None,
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memory_evidence_text: str = "",
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memory_anchor_source: str = "",
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memory_planner_text: str = "",
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background_voice: str = "default",
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normalized_user_message: Optional[str] = None,
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occupation: str = "",
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profile_birth_year: int | None = None,
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profile_era_place: str = "",
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stage_switched_this_turn: bool = False,
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scene_cues_for_planner: Optional[list[str]] = None,
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) -> AgentChatTurn:
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"""生成状态感知的访谈回复，不持久化（由 Orchestrator 负责）"""
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if not self.llm:
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logger.warning("InterviewAgent: LLM 未配置，返回兜底文案")
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return AgentChatTurn(messages=[_FALLBACK_REPLY], skip_tts=True)
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try:
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text_for_model = self._resolve_text_for_model(
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user_message, normalized_user_message
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)
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narrative_state = narrative_coverage_state(memoir_state)
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control_state = interview_control_state(memoir_state)
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empty_slots = control_state.prompt_empty_slots_for_stage(
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narrative_state, memoir_state.current_stage
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)
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filled_slots = narrative_state.filled_slots_for_stage(
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memoir_state.current_stage
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)
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if detected_user_stage is not None:
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du = detected_user_stage
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else:
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du = self._detect_user_stage(text_for_model)
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hw = await get_history_with_window(
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conversation_id,
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max_pairs=settings.chat_history_max_pairs,
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max_chars=settings.chat_history_max_chars,
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)
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recent_questions = extract_recent_questions(hw.window)
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conversation_turn_total = hw.turn_total
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all_stages_coverage = narrative_state.all_stages_coverage()
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persona = normalize_interview_persona(settings.chat_interview_persona)
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max_segments = int(settings.chat_interview_max_segments)
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max_tokens = int(settings.chat_interview_max_tokens)
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max_chars = int(settings.chat_interview_max_chars_per_segment)
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turn_plan = plan_interview_turn(
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current_stage=memoir_state.current_stage,
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empty_slots=empty_slots,
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normalized_user_message=text_for_model,
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memory_evidence_text=(memory_anchor_source or "").strip(),
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stage_switched_this_turn=stage_switched_this_turn,
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)
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logger.info(
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"event=interview_turn_plan mode={} anchor_slot={} snippet_len={}",
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turn_plan.mode,
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turn_plan.anchor_slot_key or "-",
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len(turn_plan.anchor_snippet or ""),
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)
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reply_planner_raw = ""
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baseline_mode = turn_plan.mode
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baseline_primary_focus = turn_plan.primary_focus
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if settings.chat_reply_planner_llm_enabled:
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rq_preview = (
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"\n".join(recent_questions[-4:])
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if recent_questions
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else ""
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)
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turn_plan, reply_planner_raw = await maybe_refine_turn_plan_with_llm(
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self.llm,
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plan=turn_plan,
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text_for_model=text_for_model,
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memory_evidence_text=(memory_planner_text or memory_evidence_text)
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or "",
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max_tokens=int(settings.chat_reply_planner_max_tokens),
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temperature=float(settings.chat_reply_planner_temperature),
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scene_cues_for_planner=scene_cues_for_planner or [],
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recent_questions_preview=rq_preview,
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)
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if reply_planner_raw:
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logger.info(
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"event=reply_planner_applied memory_usage={} reply_shape={} "
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"mode={} primary_focus={} focus_source={}",
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turn_plan.memory_usage,
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turn_plan.reply_shape,
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turn_plan.mode,
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turn_plan.primary_focus,
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turn_plan.focus_source,
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)
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ctx = ChatPromptContext(
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current_stage=memoir_state.current_stage,
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empty_slots=empty_slots,
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filled_slots=filled_slots,
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all_stages_coverage=all_stages_coverage,
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detected_user_stage=du,
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user_profile_context=user_profile_context,
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persona=persona,
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memory_evidence_text=memory_evidence_text,
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background_voice=background_voice,
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occupation=occupation,
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profile_birth_year=profile_birth_year,
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profile_era_place=profile_era_place,
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known_facts=memoir_state.known_facts,
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persona_threads=memoir_state.persona_threads,
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recent_questions=recent_questions or memoir_state.recent_questions,
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turn_plan=turn_plan,
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)
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system_prompt = ctx.guided_system_prompt()
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messages: List[Any] = [SystemMessage(content=system_prompt)]
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messages.extend(hw.window)
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messages.append(HumanMessage(content=text_for_model))
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history_pairs_windowed = len(hw.window) // 2
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window_chars = sum(len(getattr(m, "content", "") or "") for m in hw.window)
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logger.info(
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"event=history_window_applied total={} windowed={} chars={}",
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conversation_turn_total,
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history_pairs_windowed,
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window_chars,
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)
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log_agent_payload(
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logger,
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"InterviewAgent.generate_response.prompt",
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format_history_string(
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messages,
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omit_system_body=settings.agent_log_omit_system_message_body,
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),
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)
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chat_llm = self.llm.bind(
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max_tokens=max_tokens,
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temperature=float(settings.chat_interview_temperature),
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)
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prompt_chars = _message_contents_char_count(messages)
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llm_t0 = time.perf_counter()
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with agent_span(
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logger,
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"InterviewAgent.generate_response.llm",
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conversation_id=conversation_id,
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stage=memoir_state.current_stage,
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):
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logger.info(
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"event=chat_prompt_built agent=InterviewAgent.generate_response_with_state "
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"prompt_chars={} history_pairs_total={} history_pairs_windowed={}",
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prompt_chars,
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conversation_turn_total,
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history_pairs_windowed,
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)
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response = await chat_llm.ainvoke(messages)
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response_ms = (time.perf_counter() - llm_t0) * 1000
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logger.info(
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"event=chat_llm_done agent=InterviewAgent.generate_response_with_state "
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"response_latency_ms={:.2f}",
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response_ms,
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)
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response_text = (
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response.content if hasattr(response, "content") else str(response)
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)
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log_agent_payload(
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logger, "InterviewAgent.generate_response.raw_response", response_text
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)
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rq_base = recent_questions or memoir_state.recent_questions
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out, deduped = _finalize_chat_segments_after_llm(
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response_text,
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max_segments=max_segments,
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max_chars=max_chars,
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memoir_state=memoir_state,
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recent_questions=rq_base,
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)
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retry_used = False
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if deduped and segments_are_only_duplicate_guard_fallback(out):
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retry_system = (
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f"{system_prompt}\n\n{_DUPLICATE_GUARD_LLM_RETRY_SYSTEM_APPENDIX}"
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)
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retry_messages: List[Any] = [
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SystemMessage(content=retry_system),
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*hw.window,
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HumanMessage(content=text_for_model),
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]
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log_agent_payload(
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logger,
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"InterviewAgent.generate_response.retry_prompt",
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format_history_string(
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retry_messages,
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omit_system_body=settings.agent_log_omit_system_message_body,
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),
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)
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llm_t1 = time.perf_counter()
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with agent_span(
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logger,
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"InterviewAgent.generate_response.llm_retry",
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conversation_id=conversation_id,
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stage=memoir_state.current_stage,
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):
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logger.info(
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"event=chat_prompt_built agent=InterviewAgent.duplicate_guard_retry "
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"prompt_chars={} conversation_id={}",
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_message_contents_char_count(retry_messages),
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conversation_id,
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)
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response_retry = await chat_llm.ainvoke(retry_messages)
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logger.info(
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"event=chat_llm_done agent=InterviewAgent.duplicate_guard_retry "
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"response_latency_ms={:.2f}",
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(time.perf_counter() - llm_t1) * 1000,
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)
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response_text_retry = (
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response_retry.content
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if hasattr(response_retry, "content")
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else str(response_retry)
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)
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log_agent_payload(
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logger,
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"InterviewAgent.generate_response.raw_response_retry",
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response_text_retry,
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)
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out, deduped = _finalize_chat_segments_after_llm(
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response_text_retry,
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max_segments=max_segments,
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max_chars=max_chars,
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memoir_state=memoir_state,
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recent_questions=rq_base,
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)
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retry_used = True
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out, auto_bio = apply_autobiographical_boundary_guard(out)
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updated_recent_questions = update_recent_questions(rq_base, out)
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log_agent_summary(
|
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logger,
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"InterviewAgent.generate_response segments={} conversation_id={} "
|
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"max_tokens={}",
|
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len(out),
|
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conversation_id,
|
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max_tokens,
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)
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return AgentChatTurn(
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messages=out,
|
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skip_tts=False,
|
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interview_state_meta={
|
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"recent_questions": updated_recent_questions,
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"duplicate_question_guard_triggered": deduped,
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"duplicate_question_guard_llm_retry": retry_used,
|
||
"autobiographical_boundary_guard_triggered": auto_bio,
|
||
"reply_planner_llm_used": bool(
|
||
settings.chat_reply_planner_llm_enabled
|
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and (reply_planner_raw or "").strip()
|
||
),
|
||
"reply_planner_raw_preview": (reply_planner_raw or "")[:800],
|
||
"focus_planner_baseline_mode": baseline_mode,
|
||
"focus_planner_baseline_primary_focus": baseline_primary_focus,
|
||
"focus_planner_mode": turn_plan.mode,
|
||
"focus_planner_primary_focus": turn_plan.primary_focus,
|
||
"focus_planner_focus_source": turn_plan.focus_source,
|
||
"focus_planner_focus_summary": (turn_plan.focus_summary or "")[:200],
|
||
},
|
||
)
|
||
except Exception as e:
|
||
logger.error("生成回应失败: {}", e, exc_info=True)
|
||
return AgentChatTurn(messages=[_FALLBACK_REPLY], skip_tts=True)
|
||
|
||
async def generate_opening_message(
|
||
self,
|
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conversation_id: str,
|
||
memoir_state: MemoirStateSchema,
|
||
user_profile_context: str = "",
|
||
background_voice: str = "default",
|
||
occupation: str = "",
|
||
profile_birth_year: Optional[int] = None,
|
||
profile_era_place: str = "",
|
||
) -> List[str]:
|
||
"""生成空对话开场白，不持久化（由 Orchestrator 负责）"""
|
||
if not self.llm:
|
||
return ["你好呀～ 又见面了。今天想从人生里哪一小段回忆开始聊聊？"]
|
||
try:
|
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narrative_state = narrative_coverage_state(memoir_state)
|
||
control_state = interview_control_state(memoir_state)
|
||
empty_slots = control_state.prompt_empty_slots_for_stage(
|
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narrative_state, memoir_state.current_stage
|
||
)
|
||
empty_slots_readable = [SLOT_NAME_MAP.get(s, s) for s in empty_slots]
|
||
persona = normalize_interview_persona(settings.chat_interview_persona)
|
||
prompt = get_opening_prompt(
|
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current_stage=memoir_state.current_stage,
|
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empty_slots_readable=empty_slots_readable,
|
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user_profile_context=user_profile_context,
|
||
persona=persona,
|
||
background_voice=background_voice,
|
||
occupation=occupation,
|
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profile_birth_year=profile_birth_year,
|
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profile_era_place=profile_era_place,
|
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)
|
||
hw = await get_history_with_window(
|
||
conversation_id,
|
||
max_pairs=settings.chat_history_max_pairs,
|
||
max_chars=settings.chat_history_max_chars,
|
||
)
|
||
messages: List[Any] = [SystemMessage(content=prompt)]
|
||
messages.extend(hw.window)
|
||
if not hw.window:
|
||
messages.append(
|
||
HumanMessage(content="（对话刚开始，请自然地说出你的开场白。）")
|
||
)
|
||
else:
|
||
messages.append(
|
||
HumanMessage(content="（请根据上文，自然接续并说出你的开场白。）")
|
||
)
|
||
log_agent_payload(
|
||
logger,
|
||
"InterviewAgent.opening.prompt",
|
||
format_history_string(
|
||
messages,
|
||
omit_system_body=settings.agent_log_omit_system_message_body,
|
||
),
|
||
)
|
||
opening_llm = self.llm.bind(
|
||
max_tokens=settings.chat_opening_max_tokens,
|
||
temperature=float(settings.chat_interview_temperature),
|
||
)
|
||
prompt_chars = _message_contents_char_count(messages)
|
||
llm_t0 = time.perf_counter()
|
||
with agent_span(
|
||
logger,
|
||
"InterviewAgent.opening.llm",
|
||
conversation_id=conversation_id,
|
||
):
|
||
logger.info(
|
||
"event=chat_prompt_built agent=InterviewAgent.generate_opening_message "
|
||
"prompt_chars={} history_pairs_total={} history_pairs_windowed={}",
|
||
prompt_chars,
|
||
hw.turn_total,
|
||
len(hw.window) // 2,
|
||
)
|
||
response = await opening_llm.ainvoke(messages)
|
||
logger.info(
|
||
"event=chat_llm_done agent=InterviewAgent.generate_opening_message "
|
||
"response_latency_ms={:.2f}",
|
||
(time.perf_counter() - llm_t0) * 1000,
|
||
)
|
||
response_text = (
|
||
response.content if hasattr(response, "content") else str(response)
|
||
)
|
||
log_agent_payload(
|
||
logger, "InterviewAgent.opening.raw_response", response_text
|
||
)
|
||
raw_list = segments_from_llm_response(response_text, max_segments=2)
|
||
if not raw_list:
|
||
raw_list = [response_text.strip()]
|
||
max_chars = int(settings.chat_interview_max_chars_per_segment)
|
||
out = truncate_chat_segments(
|
||
raw_list,
|
||
max_segments=2,
|
||
max_chars_per_segment=max_chars,
|
||
)
|
||
log_agent_summary(
|
||
logger,
|
||
"InterviewAgent.opening segments={} conversation_id={}",
|
||
len(out),
|
||
conversation_id,
|
||
)
|
||
segments = out if out else [response_text.strip()[:max_chars]]
|
||
return nonempty_segments_or_fallback(
|
||
segments,
|
||
fallback="你好呀～ 又见面了。今天想从人生里哪一小段回忆开始聊聊？",
|
||
)
|
||
except Exception as e:
|
||
logger.error("生成开场白失败: {}", e, exc_info=True)
|
||
return ["你好呀～ 又见面了。今天想从人生里哪一小段回忆开始聊聊？"]
|
||
|
||
async def generate_re_greeting_message(
|
||
self,
|
||
conversation_id: str,
|
||
memoir_state: MemoirStateSchema,
|
||
idle_hours: float,
|
||
user_profile_context: str = "",
|
||
background_voice: str = "default",
|
||
occupation: str = "",
|
||
profile_birth_year: Optional[int] = None,
|
||
profile_era_place: str = "",
|
||
) -> List[str]:
|
||
"""老对话回访问候：用户带着已有历史回到对话时，AI 主动做承接式开场。
|
||
|
||
与 generate_opening_message 的差异：prompt 明确告知有历史 + 距上次的时间感受，
|
||
要求轻轻引用历史里的具体细节，不能用首次见面式硬开场。
|
||
"""
|
||
if not self.llm:
|
||
return ["上次聊到的事我还记着，今天想继续往下讲讲吗？"]
|
||
try:
|
||
narrative_state = narrative_coverage_state(memoir_state)
|
||
control_state = interview_control_state(memoir_state)
|
||
empty_slots = control_state.prompt_empty_slots_for_stage(
|
||
narrative_state, memoir_state.current_stage
|
||
)
|
||
empty_slots_readable = [SLOT_NAME_MAP.get(s, s) for s in empty_slots]
|
||
persona = normalize_interview_persona(settings.chat_interview_persona)
|
||
prompt = get_re_greeting_prompt(
|
||
current_stage=memoir_state.current_stage,
|
||
empty_slots_readable=empty_slots_readable,
|
||
user_profile_context=user_profile_context,
|
||
persona=persona,
|
||
background_voice=background_voice,
|
||
occupation=occupation,
|
||
profile_birth_year=profile_birth_year,
|
||
profile_era_place=profile_era_place,
|
||
idle_hours=idle_hours,
|
||
)
|
||
hw = await get_history_with_window(
|
||
conversation_id,
|
||
max_pairs=settings.chat_history_max_pairs,
|
||
max_chars=settings.chat_history_max_chars,
|
||
)
|
||
messages: List[Any] = [SystemMessage(content=prompt)]
|
||
messages.extend(hw.window)
|
||
messages.append(
|
||
HumanMessage(
|
||
content=(
|
||
"（用户回到这个已有历史的对话，还没说话。"
|
||
"请基于上文做温和的承接式回访问候。）"
|
||
)
|
||
)
|
||
)
|
||
log_agent_payload(
|
||
logger,
|
||
"InterviewAgent.re_greeting.prompt",
|
||
format_history_string(
|
||
messages,
|
||
omit_system_body=settings.agent_log_omit_system_message_body,
|
||
),
|
||
)
|
||
re_greet_llm = self.llm.bind(
|
||
max_tokens=settings.chat_opening_max_tokens,
|
||
temperature=float(settings.chat_interview_temperature),
|
||
)
|
||
llm_t0 = time.perf_counter()
|
||
with agent_span(
|
||
logger,
|
||
"InterviewAgent.re_greeting.llm",
|
||
conversation_id=conversation_id,
|
||
):
|
||
logger.info(
|
||
"event=chat_prompt_built agent=InterviewAgent.generate_re_greeting_message "
|
||
"prompt_chars={} history_pairs_total={} history_pairs_windowed={} idle_hours={:.2f}",
|
||
_message_contents_char_count(messages),
|
||
hw.turn_total,
|
||
len(hw.window) // 2,
|
||
idle_hours,
|
||
)
|
||
response = await re_greet_llm.ainvoke(messages)
|
||
logger.info(
|
||
"event=chat_llm_done agent=InterviewAgent.generate_re_greeting_message "
|
||
"response_latency_ms={:.2f}",
|
||
(time.perf_counter() - llm_t0) * 1000,
|
||
)
|
||
response_text = (
|
||
response.content if hasattr(response, "content") else str(response)
|
||
)
|
||
log_agent_payload(
|
||
logger, "InterviewAgent.re_greeting.raw_response", response_text
|
||
)
|
||
raw_list = segments_from_llm_response(response_text, max_segments=2)
|
||
if not raw_list:
|
||
raw_list = [response_text.strip()]
|
||
max_chars = int(settings.chat_interview_max_chars_per_segment)
|
||
out = truncate_chat_segments(
|
||
raw_list,
|
||
max_segments=2,
|
||
max_chars_per_segment=max_chars,
|
||
)
|
||
log_agent_summary(
|
||
logger,
|
||
"InterviewAgent.re_greeting segments={} conversation_id={} idle_hours={:.2f}",
|
||
len(out),
|
||
conversation_id,
|
||
idle_hours,
|
||
)
|
||
segments = out if out else [response_text.strip()[:max_chars]]
|
||
return nonempty_segments_or_fallback(
|
||
segments,
|
||
fallback="上次聊到的事我还记着，今天想继续往下讲讲吗？",
|
||
)
|
||
except Exception as e:
|
||
logger.error("生成回访问候失败: {}", e, exc_info=True)
|
||
return ["上次聊到的事我还记着，今天想继续往下讲讲吗？"]
|