146 lines
8.0 KiB
Python
146 lines
8.0 KiB
Python
"""ChatService — 대화형 /chat 오케스트레이션 (P7 슬라이스).
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ChatEngine(동기 step 전이) + UCB Q-Table(가격협상 카드선택·학습) + DB(experience_logs) 결합.
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세션 상태는 인메모리 스토어(PoC; 단일 워커). 종료 outcome 은 마지막 (state,action)에 종료보상을 역전파.
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"""
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import uuid
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from typing import Optional
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from common.enums import DBType, ErrorType
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from common.database.db_session_manager import DB_SESSION_MNG
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from common.logger import LOG
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from config.server_configs import agent_config
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from negotiation.chat.service.chat_engine import ChatEngine, ChatSession, StepView
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from negotiation.chat.service.chat_session_repository import ChatSessionRepository
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from negotiation.chat.service.script_repository import ScriptRepository
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from negotiation.policies.base import EpisodeState, PolicyContext, Transition
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from negotiation.policy.model_store import QTablePolicyStore
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from negotiation.qtable.domain.model.snapshot import NegotiationOutcome, NegotiationSnapshot
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from negotiation.qtable.domain.service.reward_calculator import RewardCalculator
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from negotiation.qtable.domain.service.state_calculator import state_index
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from negotiation.qtable.infra.repository.learning_repository import LearningRepository
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from router.v1.chat.protocol import Req_Chat, Res_Chat
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from tenancy.registry import TenantEngine
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class ChatService:
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async def chat(self, engine: TenantEngine, req: Req_Chat) -> Res_Chat:
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res = Res_Chat()
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repo = ScriptRepository(engine.config, agent_config.tenants_dir)
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sess_repo = ChatSessionRepository(engine.company_id)
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# 1) 세션 확보 / 시작 (DB 영속 — 재시작/멀티워커 안전, P8-A)
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session = await sess_repo.get(req.session_id) if req.session_id else None
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chat_engine = ChatEngine(repo, rq_type=(session.rq_type if session else req.rq_type))
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if session is None:
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# session_id honoring: backend 가 보낸 session_id(= negotiation.sessions.session_id)를
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# 새 uuid 발급 없이 그대로 세션 키로 쓴다. 없으면(직접 호출/데모) 생성.
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session = ChatSession(
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session_id=req.session_id or str(uuid.uuid4()), tenant_id=engine.tenant_id, company_id=engine.company_id,
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rq_type=req.rq_type, action_space_size=engine.action_space_size,
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context={
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"revenue_amount": req.revenue_amount, "distribution_code": req.distribution_code,
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"partner_count": req.partner_count, "acceptance_ratio": req.acceptance_ratio,
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# 앵커링값은 갑(KT/iMK)이 직접 입력한 값을 사용 (UI 기본값 = target*(1-rate)).
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"anchor_price": req.anchor_price, "target_price": req.target_price, "round": 0,
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},
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)
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view = chat_engine.start(session)
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else:
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view = chat_engine.advance(session, req.user_input)
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# 2) 학습 결합 (가격협상 카드선택 / 종료 보상)
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if view.error is None and engine.action_space_size > 0:
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if view.needs_card_selection:
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await self._select_and_learn(engine, session, res)
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elif view.outcome is not None:
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await self._terminal_learn(engine, session, view.outcome, res)
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# 3) 응답
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res.session_id = session.session_id
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res.step = view.step
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res.client_step = view.client_step
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res.script = view.script
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res.input_mode = view.input_mode
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res.input_options = view.input_options
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res.chat_end = view.chat_end
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res.outcome = view.outcome
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if view.error:
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res.result.SetResult(ErrorType.NEGO_INVALID_STEP)
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res.msg = view.error
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await sess_repo.save(session) # 진행 상태 영속화 (재시작/멀티워커 안전)
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return res
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# ---- 학습 ----------------------------------------------------------
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def _snapshot(self, session: ChatSession, outcome: NegotiationOutcome) -> NegotiationSnapshot:
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c = session.context
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return NegotiationSnapshot(
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revenue_amount=c["revenue_amount"], distribution_code=c["distribution_code"],
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partner_count=c["partner_count"], acceptance_ratio=c["acceptance_ratio"],
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input_price=c.get("input_price", c["anchor_price"]), anchor_price=c["anchor_price"],
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target_price=c["target_price"], round_number=c.get("round", 0), outcome=outcome,
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)
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async def _select_and_learn(self, engine: TenantEngine, session: ChatSession, res: Res_Chat):
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snap = self._snapshot(session, NegotiationOutcome.ONGOING)
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try:
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idx = state_index(snap, engine.config.state)
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except ValueError as ex:
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LOG.e_no_callstack(f"[ChatService] state error: {ex}")
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return
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policy, version_id, repo = await QTablePolicyStore.load(engine)
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ctx = PolicyContext(state_index=idx, snapshot=snap, action_space_size=engine.action_space_size,
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episode=EpisodeState(used_action_ids=set(session.used_action_ids)))
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decision = policy.select(ctx)
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session.used_action_ids.add(decision.action_id)
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card_id = engine.mapper.get_card_id(decision.action_id)
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reward = RewardCalculator(engine.config.reward).calculate(snap)
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policy.update(Transition(state_index=idx, action_id=decision.action_id, reward=reward.total, done=False))
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await QTablePolicyStore.persist_cell(repo, version_id, policy, idx, decision.action_id)
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session.context["last_state"] = idx
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session.context["last_action"] = decision.action_id
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await self._log(repo, session, idx, decision.action_id, card_id, snap, reward, decision.propensity, done=False)
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res.card_id = card_id
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res.policy = policy.name
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res.q_value = decision.q_value
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res.updated_q = float(policy.qtable.q[idx, decision.action_id])
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res.visit_count = int(policy.qtable.visits[idx, decision.action_id])
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res.reward_total = reward.total
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async def _terminal_learn(self, engine: TenantEngine, session: ChatSession, outcome: str, res: Res_Chat):
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oc = NegotiationOutcome.SUCCESS if outcome == "success" else NegotiationOutcome.FAILURE
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snap = self._snapshot(session, oc)
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reward = RewardCalculator(engine.config.reward).calculate(snap)
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res.reward_total = reward.total
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last_state = session.context.get("last_state")
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last_action = session.context.get("last_action")
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if last_state is None or last_action is None:
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return # 카드선택 없이 종료된 경우(예: 담당자확인 단계 이탈)
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policy, version_id, repo = await QTablePolicyStore.load(engine)
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policy.update(Transition(state_index=last_state, action_id=last_action, reward=reward.total, done=True))
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await QTablePolicyStore.persist_cell(repo, version_id, policy, last_state, last_action)
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await self._log(repo, session, last_state, last_action,
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engine.mapper.get_card_id(last_action), snap, reward, None, done=True)
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res.updated_q = float(policy.qtable.q[last_state, last_action])
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async def _log(self, repo: LearningRepository, session, state_index, action_id, card_id, snap, reward, propensity, done):
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data = {
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"session_id": session.session_id, "state_index": state_index, "action_id": action_id,
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"card_id": card_id, "snapshot": snap.to_dict(), "propensity": propensity,
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"turn": snap.round_number, "reward": reward.total, "done": done,
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"settled_price": int(snap.input_price) if snap.outcome == NegotiationOutcome.SUCCESS else None,
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}
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try:
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await DB_SESSION_MNG.execute_lambda_run([DBType.MAIN.value], [lambda s: repo.log_transition(s, data)])
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except Exception as ex:
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LOG.e_no_callstack(f"[ChatService] log failed: {ex}")
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def reset_sessions():
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"""세션은 DB(learning.chat_sessions)에 영속화된다(P8-A). 테스트는 db_engine 픽스처가 TRUNCATE 하므로 no-op."""
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pass
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