ElebobaandClaude Opus 5.5
531bef1e73
CI / ruff · pytest (pull_request) Successful in 2m33s
- CRISIS_BLOCKING (default off for the demo): a crisis no longer locks the dialog; the message and the doctor's acute alert still happen. The clinical protocol (blocking, immediate stop) stays behind the flag and keeps its tests. - Crisis signals inside a questionnaire (intake red flags, high C-SSRS, PHQ-9 item 9) no longer stop it: the test is finished and the crisis message comes at the end; the doctor's alert is raised at once/at the end. - Weapon access: asked and stored, triggers nothing (rule disabled, no red flag, no safety block). - ЕМИАС demo persona is «Никита В.»; the one-click demo stays «Андрей С.». Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
479 lines
24 KiB
Python
479 lines
24 KiB
Python
"""Dialog engine (issue #10, ADR-004): `Engine.handle(token, event) -> list[Reply]`, channel-agnostic.
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Pipeline for one incoming event (SPEC §3, guardrails #1, #2, #3):
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0. abandoned step the FSM sits in a question step (check-in, scale) the patient left more than
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`settings.abandon_after_hours` ago → back to idle first (stored answers stay; never in
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crisis, never in an onboarding chain), then the event is handled as usual.
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text event
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1. scrub() raw text → ScrubbedText. Raw text is never stored, logged or sent anywhere.
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2. consent gate no valid consent → no LLM, nothing stored; only the local crisis lexicon runs
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(protecting life does not need consent) and the core flow shows consent/refusal.
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3. safety.check() lexicon FIRST. Lexicon ACUTE → the LLM is not called at all. Otherwise the LLM risk
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classifier is an auxiliary signal combined as max(lexicon, llm): it can only raise risk.
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ACUTE → fixed crisis script verbatim (once per open crisis), state `crisis`, structured
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`safety_events` fact for lane B, MonitoringService.after_data_change() (lane B alerts).
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POSSIBLE → C-SSRS screen (scale session) and back to the previous state (or crisis if high).
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4. FSM the current state's handler (`app/dialog/flows/*`, `app/dialog/scale_session.py`).
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button / system / start events skip 1–3 (no free text) and go through the same FSM.
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After the FSM step: if clinical data were written → commit → `after_data_change()` → the returned *dialog*
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actions are executed (`app/dialog/actions.py`). The engine never creates alerts (ADR-007).
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Then a queued scale starts if the FSM rests (idle; only the C-SSRS while in crisis).
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Persist: inbound message (scrubbed) + outbound replies + `dialog_state` — only with active consent.
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Logs carry only the token, states and event codes (guardrail #8).
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"""
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import asyncio
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import logging
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import re
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from dataclasses import dataclass, field
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from datetime import datetime, timedelta
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from typing import Any
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from weakref import WeakValueDictionary
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from sqlalchemy.exc import InterfaceError, OperationalError
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from sqlalchemy.ext.asyncio import AsyncSession
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from app.config import get_settings
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from app.core import clock, safety
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from app.core.intake_runtime import intake_enabled
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from app.core.privacy import scrub
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from app.core.safety import SafetyResult, crisis_reply
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from app.core.types import RiskLevel, ScrubbedText
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from app.db import repo
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from app.db.session import get_clinical_session
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from app.dialog import scale_session
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from app.dialog.actions import execute
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from app.dialog.contracts import Event, Reply, register_engine
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from app.dialog.crisis import crisis_open, crisis_resource_lines, no_consent_crisis_text, open_crisis
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from app.dialog.flows import load_flows
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from app.dialog.flows.core import close_crisis, revoke
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from app.dialog.fsm import (
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NO_CONSENT_STATES,
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RESTING_STATES,
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Ctx,
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Step,
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apply_data,
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enter_hook_for,
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handler_for,
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is_abandonable,
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)
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from app.dialog.texts import DialogTexts, load_dialog_texts
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from app.llm.gateway import LLMGateway, get_gateway
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from app.services import questionnaire as intake_service
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from app.services.contracts import MonitoringService, get_monitoring
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log = logging.getLogger(__name__)
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LAST_PROMPT = "last_prompt"
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DEFERRED_CRISIS = "deferred_crisis"
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QUESTIONNAIRE_PREFIXES = ("scale.", "veteran.onboarding.", "intake.")
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DEFERRABLE_KINDS = frozenset({"crisis", "safety_plan"})
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MEDICINE_WORDS = re.compile(
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r"(лекарств|таблет|препарат|сертралин|пароксетин|флуоксетин|эсциталопрам|антидепрессант|побочк)", re.I
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)
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# States with their own free-text handling (idle → flows' `text:idle`; explicit question states).
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SIDE_ANSWER_SKIP = frozenset({"idle", "kb.question", "meds.question"})
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FREE_TEXT_PREFIXES = ("daily.", "meds.", "kb.") # steps that expect free text (check-in, side effects, questions)
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# Enter hooks may chain (scale done → next onboarding state → next scale); a cycle must not hang a request.
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MAX_ENTER_CHAIN = 8
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_patient_locks = WeakValueDictionary()
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# DB unreachable: answer safely instead of failing the channel (connectivity errors only — bugs must surface).
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_DB_DOWN = (OSError, OperationalError, InterfaceError)
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# dialog_state.data key: when the patient last acted in (or the FSM entered) the current step — abandon timeout.
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STEP_AT = "step_at"
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@dataclass
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class _Run:
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replies: list[Reply] = field(default_factory=list)
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notify: bool = False
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def _consented(ctx: Ctx) -> bool:
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return ctx.data.get("consent") is True and ctx.state not in NO_CONSENT_STATES
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class Engine:
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"""Real `DialogEngine`. `gateway` / `monitoring` are injectable for tests; by default resolved per call so
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a monitoring implementation registered later (lane B, #38) is picked up."""
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def __init__(self, *, gateway: LLMGateway | None = None, monitoring: MonitoringService | None = None) -> None:
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self._gateway = gateway
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self._monitoring = monitoring
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async def handle(self, token: str, event: Event) -> list[Reply]:
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texts = load_dialog_texts()
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try:
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lock = _patient_locks.setdefault(token, asyncio.Lock())
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async with lock:
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async with get_clinical_session() as session:
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await intake_service.lock_patient(session, token)
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replies = await self._handle(token, event, session, texts)
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await intake_service.dispatch_notices(token)
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return replies
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except _DB_DOWN as exc:
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log.error("dialog db unavailable token=%s event=%s error=%s", token, event.type, type(exc).__name__)
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return _degraded(event, texts)
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# ------------------------------------------------------------------------------------------ pipeline
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async def _handle(self, token: str, event: Event, session: AsyncSession, texts: DialogTexts) -> list[Reply]:
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row = await repo.get_dialog_state(session, token)
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ctx = Ctx(
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token=token,
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state=row.state if row is not None else "new",
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data=dict(row.data or {}) if row is not None else {},
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now=clock.now(),
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session=session,
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gateway=self._gateway or get_gateway(),
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monitoring=self._monitoring or get_monitoring(),
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texts=texts,
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)
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state_before = ctx.state
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run = _Run()
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if self._abandoned(ctx):
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await self._apply(ctx, self._abandon(ctx), run)
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await self._apply(ctx, await self._route(ctx, event), run)
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if run.notify:
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# Monitoring (lane B) reads the DB in its own session: commit our writes first.
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await self._save_state(ctx)
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await session.commit()
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actions = await ctx.monitoring.after_data_change(token)
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await self._apply(ctx, await execute(ctx, actions), run)
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await self._apply(ctx, await self._start_pending(ctx), run)
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self._defer_crisis_messages(ctx, event, run)
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if _consented(ctx):
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for reply in run.replies:
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# Outgoing texts may quote the safety plan (names of relatives) — scrub before storing too.
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await repo.add_message(
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session, token=token, direction="out", text=scrub(reply.text), ts=ctx.now, fsm_state=ctx.state
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)
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prompt = next((r for r in reversed(run.replies) if r.buttons), None)
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if prompt is not None and ctx.state not in RESTING_STATES:
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# Re-shown after an off-script question so the patient (and the web screen) gets the buttons back.
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ctx.data[LAST_PROMPT] = prompt.model_dump()
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if event.type != "system" or ctx.state != state_before:
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# System events the step ignores (reminders inside a scale) do not count as the patient being there.
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ctx.data[STEP_AT] = ctx.now.isoformat()
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await self._save_state(ctx)
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task_id = event.params.get("questionnaire_task")
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if event.type == "system" and task_id and run.replies:
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from app.db.intake import QuestionnaireTask
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task = await session.get(QuestionnaireTask, task_id)
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if task and task.token == token:
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task.delivery = [r.model_dump() for r in run.replies]
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log.info(
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"dialog token=%s event=%s code=%s state=%s->%s replies=%d",
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token,
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event.type,
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_event_code(event),
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state_before,
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ctx.state,
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len(run.replies),
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)
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return run.replies
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def _defer_crisis_messages(self, ctx: Ctx, event: Event, run: _Run) -> None:
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"""Crisis messages triggered by test answers wait until the questionnaire is over (team decision
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2026-10-04: let the patient finish the test, then show the crisis message; it blocks nothing). The doctor's
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alert is not delayed — only the patient-facing message. A typed acute message is never deferred."""
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if get_settings().crisis_blocking:
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return # clinical protocol: the crisis takes over immediately
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if event.type == "button" and ctx.state.startswith(QUESTIONNAIRE_PREFIXES):
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held = [r for r in run.replies if r.kind in DEFERRABLE_KINDS]
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if held:
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run.replies[:] = [r for r in run.replies if r.kind not in DEFERRABLE_KINDS]
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ctx.data[DEFERRED_CRISIS] = [*(ctx.data.get(DEFERRED_CRISIS) or []), *(r.model_dump() for r in held)]
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return
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if ctx.data.get(DEFERRED_CRISIS) and not ctx.state.startswith(QUESTIONNAIRE_PREFIXES):
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run.replies.extend(Reply.model_validate(r) for r in ctx.data.pop(DEFERRED_CRISIS))
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def _abandoned(self, ctx: Ctx) -> bool:
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"""The current question step was left unanswered longer than `abandon_after_hours` (app.core.clock)."""
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if intake_enabled() or not _consented(ctx) or ctx.state in RESTING_STATES or crisis_open(ctx.data):
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return False
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hours = ctx.texts.settings.abandon_after_hours
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last = ctx.data.get(STEP_AT)
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if not hours or not last or ctx.now - datetime.fromisoformat(last) < timedelta(hours=hours):
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return False
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return is_abandonable(ctx)
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def _abandon(self, ctx: Ctx) -> Step:
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"""Drop the unfinished step's progress (answers already stored in item_responses / daily_checkins stay;
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an unfinished scale gets no scale_results row) and rest in idle so queued scales may start."""
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log.info("dialog step abandoned token=%s state=%s", ctx.token, ctx.state)
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scale_id = scale_session.active_scale(ctx.state)
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scales = {k: v for k, v in (ctx.data.get("scales") or {}).items() if k != scale_id}
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return Step(next_state="idle", data={"checkin": None, "scales": scales or None})
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async def _route(self, ctx: Ctx, event: Event) -> Step:
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consented = _consented(ctx)
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if event.type == "text":
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# (1) scrub before anything else: from here on only ScrubbedText exists for this message.
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ctx.text = scrub(event.text or "")
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if consented and _is_revoke_command(event.text or "", ctx.texts):
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return await revoke(ctx)
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if not consented:
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return await self._no_consent_text(ctx, event)
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await self._store_in(ctx, ctx.text)
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return await self._safety(ctx, event)
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if event.type == "button":
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if consented and event.button == "consent:revoke":
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return await revoke(ctx)
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if consented and event.button == "intake:help":
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from app.db.intake import QuestionnaireRecord
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from app.dialog.flows.intake import urgent
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row = await ctx.session.get(QuestionnaireRecord, ctx.data.get("questionnaire_record", ""))
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return await urgent(ctx, row)
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if consented:
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await self._store_in(ctx, scrub(f"[button] {event.button}")) # button data comes from the client
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return await self._dispatch(ctx, event)
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if event.type == "system":
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if event.system == "doctor_ack":
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return close_crisis(ctx)
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if not consented:
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return Step() # nothing is pushed to people without consent
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if event.system == "scale_due" and event.params.get("scale"):
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if intake_enabled() and ctx.data.get("adult") is True:
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scale = str(event.params["scale"])
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kind = "cssrs_since_contact" if scale in ("cssrs_screen", "cssrs") else scale
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if kind in ("phq9", "pcl5", "rus_audit_s", "cssrs_since_contact"):
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await intake_service.queue_task(
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ctx.session, ctx.token, kind, f"external:{kind}:{ctx.now.date()}", ctx.now
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)
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return Step()
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scheduled = bool(event.params.get("scheduled", True))
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pending = scale_session.add_pending(ctx.data, str(event.params["scale"]), scheduled)
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return Step(data={"pending_scales": pending}) # starts now if resting, else after the current step
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return await self._dispatch(ctx, event)
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return await self._dispatch(ctx, event) # start
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async def _no_consent_text(self, ctx: Ctx, event: Event) -> Step:
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assert ctx.text is not None
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# Lexicon only: without consent the text must not reach the LLM (third-party processing).
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result = safety.check(ctx.text)
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if result.level == RiskLevel.ACUTE:
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log.warning("safety acute without consent token=%s rules=%s", ctx.token, result.matched_rules)
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return Step(replies=[Reply(text=no_consent_crisis_text(crisis_reply(result.categories)), kind="crisis")])
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return await self._dispatch(ctx, event)
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async def _safety(self, ctx: Ctx, event: Event) -> Step:
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"""Guardrail #2: the safety decision is made before any LLM sees the message for anything else."""
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assert ctx.text is not None
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lexicon = safety.check(ctx.text)
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if lexicon.level == RiskLevel.ACUTE:
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result = lexicon # an acute message never reaches the LLM — not even the risk classifier
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else:
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result = safety.check(ctx.text, llm_signal=await ctx.gateway.risk_classify(ctx.text))
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if result.level == RiskLevel.ACUTE:
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handled = "crisis_repeat" if crisis_open(ctx.data) else "crisis_script"
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log.warning("safety acute token=%s rules=%s handled=%s", ctx.token, result.matched_rules, handled)
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if ctx.data.get("questionnaire_record") or (intake_enabled() and ctx.data.get("adult") is True):
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from app.db.intake import QuestionnaireRecord
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from app.dialog.flows.intake import urgent
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row = await ctx.session.get(QuestionnaireRecord, ctx.data.get("questionnaire_record", ""))
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step = await urgent(ctx, row, code="safety_acute", categories=result.categories)
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else:
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step = open_crisis(ctx, result.categories, source=f"safety:{result.source}")
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step.data["safety_events"] = self._safety_events(ctx, result, handled)
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step.notify_monitoring = True # lane B escalates to the doctor on call
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return step
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if result.level == RiskLevel.POSSIBLE and (
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ctx.data.get("questionnaire_record") or (intake_enabled() and ctx.data.get("adult") is True)
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):
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from app.db.intake import QuestionnaireRecord
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from app.dialog.flows.intake import manual_review
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row = await ctx.session.get(QuestionnaireRecord, ctx.data.get("questionnaire_record", ""))
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if row is None:
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row = await intake_service.create_record(ctx, "cssrs_since_contact")
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return await manual_review(ctx, row, "cssrs_since_contact_required")
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if result.level == RiskLevel.POSSIBLE:
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screen = ctx.texts.settings.risk_screen_scale
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if self._can_screen(ctx, screen):
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step = await scale_session.start_scale(
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ctx, screen, return_state=ctx.state, scheduled=False, intro=ctx.texts.scale.risk_screen_intro
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)
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step.data["risk_screen_at"] = ctx.now.isoformat()
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handled = "risk_screen"
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else:
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step = await self._dispatch(ctx, event)
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handled = "dispatched"
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log.info("safety possible token=%s rules=%s handled=%s", ctx.token, result.matched_rules, handled)
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step.data["safety_events"] = self._safety_events(ctx, result, handled)
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step.notify_monitoring = True
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return step
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side = await self._side_answer(ctx)
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if side is not None:
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return side
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return await self._dispatch(ctx, event)
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async def _side_answer(self, ctx: Ctx) -> Step | None:
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"""A question asked in the middle of a questionnaire, a check-in or a crisis is answered right away
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(agent → guidelines/instruction), then the pending question is shown again with its buttons — the
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chat never ignores a question. Idle and the explicit question states have their own handlers.
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In a crisis the answer always carries the emergency contacts; the crisis itself stays open until the
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doctor acknowledges it, and acute messages never get here (handled above)."""
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from app.dialog.flows.knowledge import knowledge_answer, looks_like_question
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in_crisis = (crisis_open(ctx.data) or ctx.state == "crisis") and await ctx.monitoring.is_in_crisis(ctx.token)
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free_text_step = ctx.state in SIDE_ANSWER_SKIP or ctx.state.startswith(FREE_TEXT_PREFIXES)
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if ctx.text is None or (free_text_step and not in_crisis):
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return None # idle / check-in / question states parse free text themselves
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asks = looks_like_question(ctx.text) or bool(MEDICINE_WORDS.search(ctx.text))
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if asks:
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answer = await knowledge_answer(ctx, explicit=True)
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elif in_crisis:
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# Not a question, but in a crisis every message gets a human reply (with contacts below), never silence.
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answer = await ctx.gateway.phrase("support")
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else:
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return None # e.g. a free-text answer to the current scale item — the step handles it
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if not answer:
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return None
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log.info("dialog side answer token=%s state=%s crisis=%s", ctx.token, ctx.state, in_crisis)
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replies = [Reply(text=answer)]
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if in_crisis:
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script = crisis_reply([])
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replies.append(
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Reply(
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text="\n".join([ctx.texts.crisis.repeat, *crisis_resource_lines(script.resources)]), kind="crisis"
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)
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)
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elif ctx.data.get(LAST_PROMPT):
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last = Reply.model_validate(ctx.data[LAST_PROMPT])
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replies.append(last.model_copy(update={"text": f"{ctx.texts.side_answer_return}\n\n{last.text}"}))
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return Step(replies=replies)
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def _can_screen(self, ctx: Ctx, screen: str) -> bool:
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if crisis_open(ctx.data) or scale_session.active_scale(ctx.state) == screen:
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return False
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last = ctx.data.get("risk_screen_at")
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if last is None:
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return True
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hours = (ctx.now - datetime.fromisoformat(last)).total_seconds() / 3600
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return hours >= ctx.texts.settings.cssrs_cooldown_hours
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def _safety_events(self, ctx: Ctx, result: SafetyResult, handled: str) -> list[dict[str, Any]]:
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"""Structured safety fact for lane B (#38): no text, only codes. Newest last, capped."""
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event = {
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"ts": ctx.now.isoformat(),
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"level": result.level.name.lower(),
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"categories": result.categories,
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"rules": result.matched_rules,
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"source": result.source,
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||
"handled": handled,
|
||
"state": ctx.state,
|
||
}
|
||
events = [*(ctx.data.get("safety_events") or []), event]
|
||
return events[-ctx.texts.settings.max_safety_events :]
|
||
|
||
async def _dispatch(self, ctx: Ctx, event: Event) -> Step:
|
||
handler = handler_for(ctx.state)
|
||
if handler is None:
|
||
# A state from a removed/renamed flow: recover instead of getting stuck.
|
||
log.error("dialog unknown state token=%s state=%s", ctx.token, ctx.state)
|
||
return Step(next_state="idle" if _consented(ctx) else "new")
|
||
return await handler(ctx, event)
|
||
|
||
async def _apply(self, ctx: Ctx, step: Step, run: _Run, depth: int = 0) -> None:
|
||
run.replies.extend(step.replies)
|
||
apply_data(ctx.data, step.data)
|
||
run.notify = run.notify or step.notify_monitoring
|
||
if not step.next_state or step.next_state == ctx.state:
|
||
return
|
||
ctx.state = step.next_state
|
||
hook = enter_hook_for(ctx.state)
|
||
if hook is None:
|
||
return
|
||
if depth >= MAX_ENTER_CHAIN:
|
||
log.error("dialog enter chain too long token=%s state=%s", ctx.token, ctx.state)
|
||
return
|
||
await self._apply(ctx, await hook(ctx), run, depth + 1)
|
||
|
||
async def _start_pending(self, ctx: Ctx) -> Step:
|
||
"""Start a queued scale when nothing else is being asked. In crisis only the risk screen may run."""
|
||
if intake_enabled():
|
||
return Step()
|
||
pending = list(ctx.data.get("pending_scales") or [])
|
||
if not pending or ctx.state not in RESTING_STATES:
|
||
return Step()
|
||
screen = ctx.texts.settings.risk_screen_scale
|
||
dropped: dict[str, Any] = {}
|
||
if any(p["scale"] == screen for p in pending) and await scale_session.recent_risk_screen(ctx, screen):
|
||
# Item 9 / rule phq9_item9 / scale_due asked for a C-SSRS the patient completed within the cooldown:
|
||
# do not repeat the same suicide screen (#56). Crisis script and alerts are unaffected.
|
||
log.info("dialog risk screen skipped (cooldown) token=%s", ctx.token)
|
||
pending = [p for p in pending if p["scale"] != screen]
|
||
dropped = {"pending_scales": pending or None}
|
||
if not pending:
|
||
return Step(data=dropped)
|
||
if ctx.state == "crisis":
|
||
pending_screen = [p for p in pending if p["scale"] == screen]
|
||
if not pending_screen:
|
||
return Step(data=dropped)
|
||
item = pending_screen[0]
|
||
else:
|
||
item = pending[0]
|
||
rest = [p for p in pending if p is not item]
|
||
step = await scale_session.start_scale(
|
||
ctx,
|
||
item["scale"],
|
||
return_state=ctx.state,
|
||
scheduled=bool(item.get("scheduled", True)),
|
||
intro=ctx.texts.scale.risk_screen_intro if item["scale"] == screen else None,
|
||
)
|
||
step.data["pending_scales"] = rest or None
|
||
return step
|
||
|
||
async def _store_in(self, ctx: Ctx, text: ScrubbedText) -> None:
|
||
await repo.add_message(ctx.session, token=ctx.token, direction="in", text=text, ts=ctx.now, fsm_state=ctx.state)
|
||
|
||
async def _save_state(self, ctx: Ctx) -> None:
|
||
await repo.set_dialog_state(ctx.session, token=ctx.token, state=ctx.state, data=ctx.data, now=ctx.now)
|
||
|
||
|
||
def _is_revoke_command(raw: str, texts: DialogTexts) -> bool:
|
||
return raw.strip().lower().rstrip(".!") in texts.commands.revoke
|
||
|
||
|
||
def _event_code(event: Event) -> str:
|
||
if event.type == "button":
|
||
return event.button or ""
|
||
if event.type == "system":
|
||
return event.system or ""
|
||
return "-"
|
||
|
||
|
||
def _degraded(event: Event, texts: DialogTexts) -> list[Reply]:
|
||
"""DB down: still answer a crisis message (lexicon only, no "doctor notified" — nobody could be notified)."""
|
||
if event.type == "text" and event.text:
|
||
result = safety.check(scrub(event.text))
|
||
if result.level == RiskLevel.ACUTE:
|
||
return [Reply(text=no_consent_crisis_text(crisis_reply(result.categories)), kind="crisis")]
|
||
if event.type == "system":
|
||
return []
|
||
return [Reply(text=texts.unavailable, kind="info")]
|
||
|
||
|
||
load_flows()
|
||
register_engine(Engine)
|