o2o-negosium-original/backend/services/chat_service.py
2026-06-18 18:59:06 +09:00

341 lines
16 KiB
Python

"""ChatService — 채팅 페이지 오케스트레이션.
backend 가 협상 한 턴을 agent(9500) 로 위임하고, 말풍선 로그(negotiation.chats)를 영속화하며,
종료 시 세션 상태(negotiation.sessions)를 전이한다. agent 는 외부 고정 계약(agent_client 어댑터).
- init : 상품/견적 메타 + 현재 세션 상태 (타이머용 마감 시각 포함)
- messages : 대화 히스토리 복원. 비어 있고 협상중이면 agent 오프닝 한 턴을 seed(지연 생성).
- send : (검증 → 유저 메시지 저장 → agent 위임 → 봇 메시지 저장 → 종료 시 입찰 확정) 단일 트랜잭션.
append-only — 새 봇 메시지 1건만 반환(전체 refetch 회피).
"""
import uuid
from datetime import datetime, timezone
from typing import Optional
from fastapi import Depends
from common.database.db_session_manager import DB_SESSION_MNG
from common.database.model.models import chats, items, quotations, sessions
from common.enums import ChatSender, DBWRType, ErrorType, QuotationStatus, SessionStatus
from common.models.gmodel import UserInfo
from crud.chat_crud import ChatCRUD, IChatCRUD
from crud.session_crud import ISessionCRUD, SessionCRUD
from router.v1.negotiation.chat_protocol import ChatMessage, Res_ChatInit, Res_ChatMessages, Res_ChatSend
from services.agent_client import AgentChatContext, IAgentClient, get_agent_client
from services.auth_service import AuthService
# 가격 허용 범위 배수(목표가 기준). 범위를 벗어난 제시가는 CHAT_PRICE_OUT_OF_RANGE 로 막는다.
PRICE_FLOOR_RATIO = 0.3
PRICE_CEIL_RATIO = 1.7
class ChatService:
def __init__(
self,
auth: AuthService = Depends(AuthService),
session_crud: ISessionCRUD = Depends(SessionCRUD),
chat_crud: IChatCRUD = Depends(ChatCRUD),
agent: IAgentClient = Depends(get_agent_client),
):
self.auth = auth
self.session_crud = session_crud
self.chat_crud = chat_crud
self.agent = agent
# ---- 공통 전처리 ----------------------------------------------------
async def _auth_and_own_session(self, user_info: UserInfo, access_token: str, session_id_str: str):
"""인증 → 세션 로드 → 소유(공급사) 검증. (SUCCESS, sess) 또는 (err, None)."""
err_type, info = await self.auth.authenticate(user_info, access_token)
if err_type != ErrorType.SUCCESS:
return err_type, None
try:
session_id = uuid.UUID(session_id_str)
except (ValueError, TypeError):
return ErrorType.NEGO_NOT_FOUND, None
err_type, sess = await DB_SESSION_MNG.execute_lambda(
sessions.DBType(), DBWRType.DB_READ.value,
lambda s: self.session_crud.get_session_by_id(s, session_id),
)
if err_type != ErrorType.SUCCESS or sess is None:
return ErrorType.NEGO_NOT_FOUND, None
if str(sess.supplier_id) != info.supplier_id:
return ErrorType.NEGO_FORBIDDEN, None
return ErrorType.SUCCESS, sess
# ---- init -----------------------------------------------------------
async def init(self, user_info: UserInfo, access_token: str, session_id_str: str) -> Res_ChatInit:
res = Res_ChatInit()
err_type, sess = await self._auth_and_own_session(user_info, access_token, session_id_str)
if err_type != ErrorType.SUCCESS:
res.result.SetResult(err_type)
return res
err_type, quote = await DB_SESSION_MNG.execute_lambda(
quotations.DBType(), DBWRType.DB_READ.value,
lambda s: self.session_crud.get_quotation_by_id(s, sess.quotation_id),
)
if err_type != ErrorType.SUCCESS or quote is None:
res.result.SetResult(ErrorType.NEGO_NOT_FOUND)
return res
err_type, item = await DB_SESSION_MNG.execute_lambda(
items.DBType(), DBWRType.DB_READ.value,
lambda s: self.chat_crud.get_item_by_id(s, sess.item_id),
)
if err_type != ErrorType.SUCCESS or item is None:
res.result.SetResult(ErrorType.NEGO_NOT_FOUND)
return res
# 마감 시간 초과 + 협상생성이면 미참여로 정리 (participate 와 동일 일관성).
end = quote.end_time
if end is not None and end.tzinfo is None:
end = end.replace(tzinfo=timezone.utc)
if end is not None and end < datetime.now(timezone.utc) and sess.status == SessionStatus.CREATED.value:
await DB_SESSION_MNG.execute_lambda_run(
[sessions.DBType()],
[lambda s: self.session_crud.update_session_status(s, sess.session_id, SessionStatus.NOT_PARTICIPATED.value)],
)
sess.status = SessionStatus.NOT_PARTICIPATED.value
res.session_id = str(sess.session_id)
res.session_status = sess.status
res.quotation_id = str(sess.quotation_id)
res.quotation_end_time = quote.end_time.isoformat(timespec="seconds") if quote.end_time else ""
res.quotation_memo = quote.memo or ""
res.item_id = str(item.item_id)
res.item_name = item.name or ""
res.item_code = item.code or ""
res.item_image = item.image_url or ""
res.item_price = item.price or 0
res.item_model_name = item.model_name or ""
res.item_maker_name = item.manufacturer or ""
res.item_spec = item.spec or ""
res.item_lead_time = str(item.lead_time) if item.lead_time is not None else ""
res.item_min_order_quantity = item.moq or ""
res.item_vat_yn = item.vat_yn
res.item_delivery_fee_yn = item.delivery_fee_yn
return res
# ---- messages -------------------------------------------------------
async def messages(self, user_info: UserInfo, access_token: str, session_id_str: str) -> Res_ChatMessages:
res = Res_ChatMessages()
err_type, sess = await self._auth_and_own_session(user_info, access_token, session_id_str)
if err_type != ErrorType.SUCCESS:
res.result.SetResult(err_type)
return res
err_type, rows = await DB_SESSION_MNG.execute_lambda(
chats.DBType(), DBWRType.DB_READ.value,
lambda s: self.chat_crud.list_by_session(s, sess.session_id),
)
if err_type != ErrorType.SUCCESS:
res.result.SetResult(err_type)
return res
# 비어 있고 협상중이면 agent 오프닝 한 턴을 seed (재진입 시 인사 메시지 보존)
if not rows and sess.status == SessionStatus.IN_PROGRESS.value:
opening = await self._seed_opening(sess)
if opening is not None:
res.items = [opening]
return res
res.items = [self._row_to_message(r) for r in rows]
return res
async def _seed_opening(self, sess) -> Optional[ChatMessage]:
"""오프닝(턴0) 봇 메시지를 agent 로 생성하고 seq=1 로 저장한다. 동시 진입 충돌은 무시(유니크가 방어)."""
ctx = await self._agent_context(sess, turn=0)
turn = await self.agent.chat(session_id=str(sess.session_id), user_input=None, ctx=ctx)
if not turn.ok:
return None
bot = self._build_bot_chat(sess, seq=1, turn=turn)
await DB_SESSION_MNG.execute_lambda_run(
[chats.DBType()], [lambda s: self.chat_crud.insert_message(s, bot)]
)
return self._chat_to_message(bot)
# ---- send (핵심) ----------------------------------------------------
async def send(self, user_info: UserInfo, access_token: str, session_id_str: str, user_input_type: Optional[str], user_input: str) -> Res_ChatSend:
res = Res_ChatSend()
err_type, sess = await self._auth_and_own_session(user_info, access_token, session_id_str)
if err_type != ErrorType.SUCCESS:
res.result.SetResult(err_type)
return res
# 협상중이 아니면 대화 불가
if sess.status != SessionStatus.IN_PROGRESS.value:
res.result.SetResult(ErrorType.CHAT_NOT_IN_PROGRESS)
return res
# 견적 마감/시간 검증
err_type, quote = await DB_SESSION_MNG.execute_lambda(
quotations.DBType(), DBWRType.DB_READ.value,
lambda s: self.session_crud.get_quotation_by_id(s, sess.quotation_id),
)
if err_type != ErrorType.SUCCESS or quote is None:
res.result.SetResult(ErrorType.NEGO_NOT_FOUND)
return res
if quote.status == QuotationStatus.CLOSED.value:
res.result.SetResult(ErrorType.NEGO_QUOTATION_CLOSED)
return res
end = quote.end_time
if end is not None and end.tzinfo is None:
end = end.replace(tzinfo=timezone.utc)
if end is not None and end < datetime.now(timezone.utc):
res.result.SetResult(ErrorType.NEGO_DEADLINE_PASSED)
return res
# 가격 입력이면 범위 검증
price = _parse_price(user_input) if user_input_type == "price" else None
if user_input_type == "price":
if price is None or not _in_price_range(price, sess.target_price):
res.result.SetResult(ErrorType.CHAT_PRICE_OUT_OF_RANGE)
return res
# 직전 메시지(seq/sender) — 동시전송 가드 + seq 채번
err_type, (max_seq, last_sender) = await DB_SESSION_MNG.execute_lambda(
chats.DBType(), DBWRType.DB_READ.value,
lambda s: self.chat_crud.get_last(s, sess.session_id),
)
if err_type != ErrorType.SUCCESS:
res.result.SetResult(err_type)
return res
# 직전이 유저 메시지면 이전 턴이 아직 처리 중(봇 응답 미도착) → 중복 전송 거절
if last_sender == ChatSender.USER.value:
res.result.SetResult(ErrorType.CHAT_IN_PROGRESS)
return res
err_type, turn_no = await DB_SESSION_MNG.execute_lambda(
chats.DBType(), DBWRType.DB_READ.value,
lambda s: self.chat_crud.count_bot_messages(s, sess.session_id),
)
if err_type != ErrorType.SUCCESS:
res.result.SetResult(err_type)
return res
# 유저 메시지 선점(pre-claim): (session_id, seq) 부분 유니크로 동시 전송을 직렬화한다.
# 경합에서 밀리면(같은 seq 충돌) agent 를 호출하지 않고 CHAT_IN_PROGRESS 로 거절 → 중복 진행 방지.
user_msg = self._build_user_chat(sess, seq=max_seq + 1, user_input=user_input, user_input_type=user_input_type, price=price)
err_type = await DB_SESSION_MNG.execute_lambda_run(
[chats.DBType()], [lambda s: self.chat_crud.insert_message(s, user_msg)]
)
if err_type == ErrorType.DB_ALREADY_SAME_KEY:
res.result.SetResult(ErrorType.CHAT_IN_PROGRESS)
return res
if err_type != ErrorType.SUCCESS:
res.result.SetResult(err_type)
return res
# agent 위임 (한 턴). 실패 시 선점한 유저 메시지를 롤백 → 재시도 가능.
ctx = await self._agent_context(sess, turn=turn_no)
turn = await self.agent.chat(session_id=str(sess.session_id), user_input=user_input, ctx=ctx)
if not turn.ok:
await DB_SESSION_MNG.execute_lambda_run(
[chats.DBType()], [lambda s: self.chat_crud.soft_delete_message(s, user_msg.chat_id)]
)
res.result.SetResult(ErrorType.CHAT_AGENT_UNAVAILABLE)
return res
# 봇 메시지 + 종료 시 확정(성공=DONE+입찰가 / 실패=REJECTED+거부사유·제시가). 한 트랜잭션.
bot_msg = self._build_bot_chat(sess, seq=max_seq + 2, turn=turn)
funcs = [lambda s: self.chat_crud.insert_message(s, bot_msg)]
new_status = sess.status
if turn.chat_end:
if turn.outcome == "success":
new_status = SessionStatus.DONE.value
bid = price if price is not None else sess.target_price
funcs.append(lambda s: self.chat_crud.finalize_session(s, sess.session_id, new_status, bid_price=bid))
else:
new_status = SessionStatus.REJECTED.value
funcs.append(lambda s: self.chat_crud.finalize_session(
s, sess.session_id, new_status,
reject_reason=(user_input or None), reject_price=price,
))
err_type = await DB_SESSION_MNG.execute_lambda_run([chats.DBType()], funcs)
if err_type != ErrorType.SUCCESS:
# 봇 저장 실패 시에도 선점 유저 메시지를 롤백해 stuck(CHAT_IN_PROGRESS) 방지.
await DB_SESSION_MNG.execute_lambda_run(
[chats.DBType()], [lambda s: self.chat_crud.soft_delete_message(s, user_msg.chat_id)]
)
res.result.SetResult(err_type)
return res
res.message = self._chat_to_message(bot_msg)
res.session_status = new_status
return res
# ---- 빌더 / 매퍼 ----------------------------------------------------
async def _agent_context(self, sess, turn: int) -> AgentChatContext:
# 핸드오프 #2/#5: X-Tenant-ID 는 견적(갑) 회사 company_id 여야 한다.
# 상품(partner.items)의 소유 회사가 갑(buyer)이므로 item.company_id 로 해석한다.
tenant_id = "" # 해석 실패 시 빈 값(agent 가 400) — 로깅으로 추적
err_type, item = await DB_SESSION_MNG.execute_lambda(
items.DBType(), DBWRType.DB_READ.value,
lambda s: self.chat_crud.get_item_by_id(s, sess.item_id),
)
if err_type == ErrorType.SUCCESS and item is not None and item.company_id:
tenant_id = str(item.company_id)
rq_type = "재협상" if sess.qt_type == 1 else "재견적"
anchor = int(sess.target_price * 0.99) if sess.target_price else 0
return AgentChatContext(
tenant_id=tenant_id, rq_type=rq_type,
target_price=int(sess.target_price or 0), anchor_price=anchor, turn=turn,
)
def _build_user_chat(self, sess, seq: int, user_input: str, user_input_type: Optional[str], price: Optional[int]) -> chats:
return chats(
chat_id=uuid.uuid4(), session_id=sess.session_id, seq=seq,
sender=ChatSender.USER.value,
target_price=int(price) if price is not None else 0,
meta={"script": user_input, "user_input_type": user_input_type},
)
def _build_bot_chat(self, sess, seq: int, turn) -> chats:
return chats(
chat_id=uuid.uuid4(), session_id=sess.session_id, seq=seq,
sender=ChatSender.BOT.value,
target_price=int(sess.target_price or 0),
meta={
"script": turn.script, "step": turn.step, "client_step": turn.client_step,
"input_mode": turn.input_mode, "input_options": turn.input_options,
"chat_end": turn.chat_end, "card_id": turn.card_id,
},
)
def _chat_to_message(self, c: chats) -> ChatMessage:
"""방금 만든 chats 객체 → 응답 ChatMessage (DB 재조회 없이)."""
meta = c.meta or {}
return ChatMessage(
chat_id=str(c.chat_id), session_id=str(c.session_id), seq=c.seq, sender=c.sender,
script=meta.get("script") or "",
user_input_type=meta.get("user_input_type"),
step=meta.get("step") or "",
display_step=meta.get("client_step") or "",
next_input_mode=meta.get("input_mode"),
next_input_type=meta.get("input_options"),
chat_end=bool(meta.get("chat_end", False)),
)
def _row_to_message(self, r) -> ChatMessage:
"""DB 행(chats) → 응답 ChatMessage."""
return self._chat_to_message(r)
# ---- 가격 유틸 ----------------------------------------------------------
def _parse_price(text: Optional[str]) -> Optional[int]:
if not text:
return None
digits = "".join(ch for ch in text if ch.isdigit())
return int(digits) if digits else None
def _in_price_range(price: int, target_price: Optional[int]) -> bool:
if not target_price:
return price > 0
return int(target_price * PRICE_FLOOR_RATIO) <= price <= int(target_price * PRICE_CEIL_RATIO)