542 lines
23 KiB
Python
542 lines
23 KiB
Python
from __future__ import annotations
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from dataclasses import dataclass, replace
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from typing import Any, Iterable, Mapping
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from sqlalchemy import and_, or_, select
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from sqlalchemy.ext.asyncio import AsyncSession
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from app.enums.credit_record import (
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CREDIT_RECORD_BILLING_SCENE_LABELS,
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CreditRecordAction,
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CreditRecordSubject,
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)
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from app.enums.llm_billing import (
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LlmBillingDomain,
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LlmBillingEvent,
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LlmBillingExecutionStatus,
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LlmBillingLedgerState,
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)
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from app.models.base import AsyncSessionLocal
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from app.models.credit_record import CreditRecord
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from app.models.llm_billing.call_attempt import LlmCallAttempt
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from app.models.llm_billing.execution import LlmBillingExecution
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from app.models.model_config import ModelConfig
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from app.services.credit.locking import acquire_user_credit_lock
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from app.services.credit.utils import to_float, utc_now
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from app.services.credits import deduct_credits_result
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from app.services.generation.billing_service import BillingItem, BillingSummary
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from app.services.llm_billing.call_audit_service import (
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create_call_attempt,
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finish_call_failure,
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finish_call_success,
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)
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from app.services.llm_billing.config import get_llm_billing_policy
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from app.services.llm_billing.context import (
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LlmBillingConfigurationError,
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LlmBillingContext,
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LlmBillingStateError,
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LlmProviderPostprocessError,
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LlmPreDeductResult,
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LlmPreDeductValidation,
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)
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from app.services.operation_log_service import log_operation_event
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from app.utils.id_gen import generate_id
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@dataclass(slots=True)
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class _ExecutionState:
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execution: LlmBillingExecution | None
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state: LlmBillingLedgerState
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reason: str | None = None
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def _scene_name(ctx: LlmBillingContext, policy_name: str | None = None) -> str:
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return (
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policy_name
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or CREDIT_RECORD_BILLING_SCENE_LABELS.get(ctx.billing_scene or "")
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or ctx.description_prefix
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or ctx.billing_scene
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or "LLM功能"
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)
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def _detail(ctx: LlmBillingContext, **extra: Any) -> dict[str, Any]:
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return {
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"scene_code": ctx.billing_scene,
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"owner_type": ctx.owner_type,
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"owner_id": ctx.owner_id,
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"attempt_no": ctx.attempt_no,
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"billing_execution_id": ctx.billing_execution_id,
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"model_config_id": ctx.model_config_id,
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"model_name": ctx.model_name,
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"provider": ctx.provider,
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**extra,
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}
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def _log(ctx: LlmBillingContext, event: LlmBillingEvent, *, status: str = "success", error: str | None = None, **detail: Any) -> None:
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log_operation_event(
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domain=LlmBillingDomain.LLM_BILLING.value,
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module=ctx.source_module or "llm",
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event_type=event.value,
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event_status=status,
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trace_id=ctx.trace_id,
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request_id=ctx.request_id,
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user_id=ctx.user_id,
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project_id=ctx.source_project_id,
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task_id=ctx.celery_task_id,
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step_id=ctx.source_step_id,
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message=_scene_name(ctx),
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detail=_detail(ctx, **detail),
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error=error,
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)
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async def _select_fixed_model(db: AsyncSession, ctx: LlmBillingContext) -> None:
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if ctx.model_config_id:
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result = await db.execute(select(ModelConfig).where(ModelConfig.id == ctx.model_config_id).limit(1))
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model = result.scalar_one_or_none()
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else:
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result = await db.execute(
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select(ModelConfig)
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.where(ModelConfig.is_active.is_(True), ModelConfig.deleted_at.is_(None), ModelConfig.provider != "mock")
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.order_by(ModelConfig.priority.desc(), ModelConfig.id.asc())
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.limit(1)
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)
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model = result.scalar_one_or_none()
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if model is None:
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raise LlmBillingConfigurationError("没有可用的真实LLM模型，且本版本禁止Mock或自动降级")
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ctx.model_config_id = model.id
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ctx.model_name = model.model_name
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ctx.provider = model.provider
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ctx.model_parameters_snapshot = {
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"model_config_id": model.id,
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"name": model.name,
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"provider": model.provider,
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"api_base": model.api_base,
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"model_name": model.model_name,
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"max_tokens": model.max_tokens,
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"temperature": model.temperature,
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}
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async def _find_execution(db: AsyncSession, ctx: LlmBillingContext, *, for_update: bool = False) -> LlmBillingExecution | None:
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stmt = select(LlmBillingExecution).where(
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LlmBillingExecution.user_id == ctx.user_id,
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LlmBillingExecution.scene_code == (ctx.billing_scene or ""),
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LlmBillingExecution.owner_type == ctx.owner_type,
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LlmBillingExecution.owner_id == ctx.owner_id,
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LlmBillingExecution.business_attempt_no == ctx.attempt_no,
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).limit(1)
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if for_update:
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stmt = stmt.with_for_update()
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result = await db.execute(stmt)
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return result.scalar_one_or_none()
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def _state_for_execution(execution: LlmBillingExecution | None) -> LlmBillingLedgerState:
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if execution is None:
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return LlmBillingLedgerState.MISSING
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mapping = {
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LlmBillingExecutionStatus.PRE_DEDUCTED.value: LlmBillingLedgerState.ACTIVE,
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LlmBillingExecutionStatus.PROCESSING.value: LlmBillingLedgerState.ACTIVE,
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LlmBillingExecutionStatus.SUCCEEDED.value: LlmBillingLedgerState.SUCCEEDED,
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LlmBillingExecutionStatus.FINAL_FAILED.value: LlmBillingLedgerState.FINAL_FAILED,
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LlmBillingExecutionStatus.REFUNDED.value: LlmBillingLedgerState.REFUNDED,
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LlmBillingExecutionStatus.REFUND_FAILED.value: LlmBillingLedgerState.INVALID,
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}
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return mapping.get(execution.status, LlmBillingLedgerState.INVALID)
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async def pre_deduct(db: AsyncSession, ctx: LlmBillingContext) -> LlmPreDeductResult:
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"""在业务 API 事务内同步足额预扣固定场景积分。"""
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_log(ctx, LlmBillingEvent.PRE_DEDUCT_START, status="started")
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if not ctx.billing_scene:
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raise LlmBillingConfigurationError("LLM固定预扣必须指定billing_scene")
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# 幂等执行记录查询必须位于用户积分事务锁之后。否则两个相同 API 请求
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# 可能都在锁前读到 missing，第二个虽不会重复扣分，却会撞执行记录唯一键。
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await acquire_user_credit_lock(db, ctx.user_id)
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existing = await _find_execution(db, ctx, for_update=True)
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if existing:
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ctx.billing_execution_id = existing.id
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ctx.model_config_id = existing.model_config_id
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ctx.model_name = existing.model_name_snapshot
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ctx.provider = existing.provider_snapshot
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return LlmPreDeductResult(
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amount=to_float(existing.pre_deduct_credits),
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state=_state_for_execution(existing),
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created=False,
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record_id=existing.credit_record_id,
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execution_id=existing.id,
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)
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await _select_fixed_model(db, ctx)
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policy = await get_llm_billing_policy(
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db,
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scene_code=ctx.billing_scene,
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)
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if not policy.valid:
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_log(ctx, LlmBillingEvent.PRE_DEDUCT_CONFIG_INVALID, status="failed", error=policy.error)
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raise LlmBillingConfigurationError(policy.error or "LLM固定预扣配置无效")
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scene_name = _scene_name(ctx, policy.scene_name)
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meta = {
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"owner_type": ctx.owner_type,
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"owner_id": ctx.owner_id,
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"attempt_no": ctx.attempt_no,
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"charge_kind": ctx.charge_kind,
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"charge_action": CreditRecordAction.PRE_DEDUCT.value,
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"credit_subject": CreditRecordSubject.TEXT.value,
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"billing_scene": ctx.billing_scene,
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"scene_name_snapshot": scene_name,
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"source_module": ctx.source_module,
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"source_project_id": ctx.source_project_id,
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"source_step_id": ctx.source_step_id,
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"source_step_code": ctx.source_step_code,
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"engine_type": "model",
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"engine_id": ctx.model_config_id,
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"engine_provider": ctx.provider,
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"engine_model_name": ctx.model_name,
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}
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mutation = await deduct_credits_result(
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db,
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user_id=ctx.user_id,
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amount=policy.pre_deduct_credits,
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description=f"{scene_name}固定预扣积分",
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related_id=ctx.related_id or ctx.owner_id,
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biz_key=ctx.pre_deduct_biz_key,
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record_meta=meta,
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record_type="consume",
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request_time=ctx.request_time or utc_now(),
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)
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if mutation.record is None:
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raise LlmBillingStateError("LLM固定预扣流水创建失败")
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execution = LlmBillingExecution(
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id=generate_id(),
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user_id=ctx.user_id,
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scene_code=ctx.billing_scene,
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scene_name_snapshot=scene_name,
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owner_type=ctx.owner_type,
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owner_id=ctx.owner_id,
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business_attempt_no=ctx.attempt_no,
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model_config_id=ctx.model_config_id,
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model_name_snapshot=ctx.model_name,
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provider_snapshot=ctx.provider,
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model_parameters_snapshot=ctx.model_parameters_snapshot,
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billing_policy_id=policy.policy_id,
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billing_policy_version=policy.version,
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request_time=ctx.request_time or utc_now(),
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pre_deduct_credits=policy.pre_deduct_credits,
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credit_record_id=mutation.record.id,
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status=LlmBillingExecutionStatus.PRE_DEDUCTED.value,
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)
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db.add(execution)
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await db.flush()
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mutation.record.llm_billing_execution_id = execution.id
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mutation.record.scene_name_snapshot = scene_name
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ctx.billing_execution_id = execution.id
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_log(ctx, LlmBillingEvent.PRE_DEDUCT_SUCCESS, amount=policy.pre_deduct_credits, credit_record_id=mutation.record.id)
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return LlmPreDeductResult(
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amount=policy.pre_deduct_credits,
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state=LlmBillingLedgerState.ACTIVE,
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created=mutation.created,
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record_id=mutation.record.id,
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execution_id=execution.id,
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)
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async def ensure_pre_deducted(db: AsyncSession, ctx: LlmBillingContext) -> LlmPreDeductValidation:
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execution = await _find_execution(db, ctx)
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if execution is None:
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return LlmPreDeductValidation(False, 0.0, LlmBillingLedgerState.MISSING, "pre_deduct_missing")
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ctx.billing_execution_id = execution.id
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ctx.model_config_id = execution.model_config_id
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ctx.model_name = execution.model_name_snapshot
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ctx.provider = execution.provider_snapshot
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ctx.model_parameters_snapshot = execution.model_parameters_snapshot
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state = _state_for_execution(execution)
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can_execute = state == LlmBillingLedgerState.ACTIVE
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if not can_execute:
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_log(ctx, LlmBillingEvent.EXECUTION_BLOCKED, status="failed", execution_status=execution.status)
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else:
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_log(ctx, LlmBillingEvent.EXECUTION_VALIDATE_SUCCESS, execution_status=execution.status)
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return LlmPreDeductValidation(
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can_execute=can_execute,
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amount=to_float(execution.pre_deduct_credits),
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state=state,
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reason=None if can_execute else execution.status,
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pre_deduct_record_id=execution.credit_record_id,
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execution_id=execution.id,
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)
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async def get_llm_ledger_states(db: AsyncSession, contexts: Iterable[LlmBillingContext]) -> dict[str, LlmPreDeductValidation]:
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items = list(contexts)
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if not items:
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return {}
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conditions = [
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and_(
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LlmBillingExecution.user_id == ctx.user_id,
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LlmBillingExecution.scene_code == (ctx.billing_scene or ""),
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LlmBillingExecution.owner_type == ctx.owner_type,
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LlmBillingExecution.owner_id == ctx.owner_id,
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LlmBillingExecution.business_attempt_no == ctx.attempt_no,
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)
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for ctx in items
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]
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result = await db.execute(select(LlmBillingExecution).where(or_(*conditions)))
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by_key = {
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(row.user_id, row.scene_code, row.owner_type, row.owner_id, row.business_attempt_no): row
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for row in result.scalars().all()
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}
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output: dict[str, LlmPreDeductValidation] = {}
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for ctx in items:
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row = by_key.get((ctx.user_id, ctx.billing_scene or "", ctx.owner_type, ctx.owner_id, ctx.attempt_no))
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state = _state_for_execution(row)
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output[ctx.pre_deduct_biz_key] = LlmPreDeductValidation(
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can_execute=state == LlmBillingLedgerState.ACTIVE,
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amount=to_float(row.pre_deduct_credits) if row else 0.0,
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state=state,
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reason=None if state == LlmBillingLedgerState.ACTIVE else (row.status if row else "missing"),
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pre_deduct_record_id=row.credit_record_id if row else None,
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execution_id=row.id if row else None,
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)
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return output
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async def validate_retryable_previous_attempt(db: AsyncSession, ctx: LlmBillingContext) -> LlmPreDeductValidation:
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previous = replace(ctx, attempt_no=max(1, ctx.attempt_no - 1)) if ctx.attempt_no > 1 else ctx
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validation = (await get_llm_ledger_states(db, [previous]))[previous.pre_deduct_biz_key]
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if ctx.attempt_no <= 1:
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return LlmPreDeductValidation(True, 0.0, LlmBillingLedgerState.MISSING, "first_attempt")
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allowed = validation.state in {
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LlmBillingLedgerState.SUCCEEDED,
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LlmBillingLedgerState.REFUNDED,
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LlmBillingLedgerState.FINAL_FAILED,
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}
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return LlmPreDeductValidation(allowed, validation.amount, validation.state, None if allowed else "previous_attempt_not_final", validation.pre_deduct_record_id, validation.execution_id)
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async def log_provider_start(db: AsyncSession, ctx: LlmBillingContext, *, detail: Mapping[str, Any] | None = None) -> None:
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if not ctx.billing_execution_id:
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validation = await ensure_pre_deducted(db, ctx)
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if not validation.can_execute:
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raise LlmBillingStateError("缺少有效固定预扣，禁止调用LLM")
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await create_call_attempt(ctx, detail=detail)
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_log(ctx, LlmBillingEvent.PROVIDER_START, status="started", call_attempt_id=ctx.current_call_attempt_id, detail=dict(detail or {}))
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async def log_provider_success(db: AsyncSession, ctx: LlmBillingContext, *, usage: Mapping[str, Any] | None = None) -> None:
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# 先记录内存中的供应商成功事实。即使独立审计事务异常，外层异常处理也
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# 必须按“供应商成功、后处理失败”处理，不能覆盖成 provider failed。
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ctx.provider_call_succeeded = True
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ctx.provider_usage_snapshot = dict(usage or {})
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await finish_call_success(ctx, usage=usage)
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_log(ctx, LlmBillingEvent.PROVIDER_SUCCESS, call_attempt_id=ctx.current_call_attempt_id, usage=dict(usage or {}))
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async def log_provider_failure(db: AsyncSession, ctx: LlmBillingContext, *, error: str) -> None:
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if ctx.provider_call_succeeded:
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# 可能是首次成功审计落库失败后进入外层异常处理。先幂等补记真实成功，
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# 再把当前异常记为 postprocess failure。
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await finish_call_success(ctx, usage=ctx.provider_usage_snapshot or {})
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outcome = await finish_call_failure(ctx, error=error)
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event = LlmBillingEvent.POSTPROCESS_FAILURE if outcome == "postprocess_failure" else LlmBillingEvent.PROVIDER_FAILURE
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_log(
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ctx,
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event,
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status="failed",
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call_attempt_id=ctx.current_call_attempt_id,
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failure_stage="postprocess" if outcome == "postprocess_failure" else "provider",
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error=error,
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)
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async def record_provider_exception(
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db: AsyncSession,
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ctx: LlmBillingContext,
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exc: Exception,
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) -> tuple[bool, dict[str, Any]]:
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"""记录供应商失败，或“供应商成功但后处理失败”的真实调用事实。"""
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if ctx.provider_call_succeeded:
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usage = dict(ctx.provider_usage_snapshot or {})
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await log_provider_failure(db, ctx, error=str(exc))
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return True, usage
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if isinstance(exc, LlmProviderPostprocessError):
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usage = dict(exc.usage or {})
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await log_provider_success(db, ctx, usage=usage)
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await log_provider_failure(db, ctx, error=str(exc))
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return True, usage
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await log_provider_failure(db, ctx, error=str(exc))
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return False, {}
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def log_celery_dispatch_start(ctx: LlmBillingContext) -> None:
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_log(ctx, LlmBillingEvent.CELERY_DISPATCH_START, status="started")
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def log_celery_dispatch_success(ctx: LlmBillingContext) -> None:
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_log(ctx, LlmBillingEvent.CELERY_DISPATCH_SUCCESS)
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def log_celery_dispatch_failure(ctx: LlmBillingContext, *, error: str) -> None:
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_log(ctx, LlmBillingEvent.CELERY_DISPATCH_FAILURE, status="failed", error=error)
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def log_celery_dispatch_compensated(ctx: LlmBillingContext, *, error: str) -> None:
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_log(ctx, LlmBillingEvent.CELERY_DISPATCH_COMPENSATED, status="warning", error=error)
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async def mark_business_success(
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db: AsyncSession,
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ctx: LlmBillingContext,
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*,
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usage: Mapping[str, Any],
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description: str | None = None,
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) -> BillingSummary:
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# 调用审计使用独立短事务，必须在当前 Session 锁定 execution 之前完成。
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# 若先锁 execution 再等待独立 Session 更新同一行，会形成自锁死等待。
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if ctx.current_call_attempt_id:
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await finish_call_success(ctx, usage=usage)
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execution = await _find_execution(db, ctx, for_update=True)
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if execution is None:
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raise LlmBillingStateError("LLM固定预扣执行记录不存在")
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ctx.billing_execution_id = execution.id
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created = execution.status != LlmBillingExecutionStatus.SUCCEEDED.value
|
|
if execution.status in {LlmBillingExecutionStatus.REFUNDED.value, LlmBillingExecutionStatus.FINAL_FAILED.value}:
|
|
raise LlmBillingStateError("LLM业务已最终失败并退款，不能再标记成功")
|
|
execution.status = LlmBillingExecutionStatus.SUCCEEDED.value
|
|
execution.completed_at = utc_now()
|
|
call_result = await db.execute(
|
|
select(LlmCallAttempt)
|
|
.where(LlmCallAttempt.billing_execution_id == execution.id)
|
|
.order_by(LlmCallAttempt.call_sequence.desc())
|
|
.limit(1)
|
|
)
|
|
last_call = call_result.scalar_one_or_none()
|
|
if last_call:
|
|
last_call.postprocess_status = "succeeded"
|
|
last_call.postprocess_error = None
|
|
record_result = await db.execute(select(CreditRecord).where(CreditRecord.id == execution.credit_record_id).limit(1).with_for_update())
|
|
record = record_result.scalar_one_or_none()
|
|
if record:
|
|
record.input_tokens = execution.total_input_tokens
|
|
record.output_tokens = execution.total_output_tokens
|
|
record.total_tokens = execution.total_tokens
|
|
record.llm_call_count = execution.total_call_count
|
|
record.llm_success_call_count = execution.successful_call_count
|
|
record.llm_failed_call_count = execution.failed_call_count
|
|
_log(ctx, LlmBillingEvent.BUSINESS_SUCCESS, pre_deduct_credits=to_float(execution.pre_deduct_credits), idempotent=not created)
|
|
return BillingSummary(
|
|
record_id=ctx.owner_id,
|
|
user_id=ctx.user_id,
|
|
items=[
|
|
BillingItem(
|
|
charge_key=ctx.charge_kind,
|
|
amount=to_float(execution.pre_deduct_credits),
|
|
charged=created,
|
|
skipped_reason=None if created else "already_succeeded",
|
|
biz_key=ctx.billing_biz_key,
|
|
attempt_no=ctx.attempt_no,
|
|
)
|
|
],
|
|
)
|
|
|
|
|
|
async def refund_on_final_failure(db: AsyncSession, ctx: LlmBillingContext, *, error: str | None = None) -> BillingSummary:
|
|
from app.services.credit.ledger_service import refund_consumption
|
|
|
|
# 与固定预扣保持 user advisory -> execution -> balance 的统一锁顺序。
|
|
await acquire_user_credit_lock(db, ctx.user_id)
|
|
execution = await _find_execution(db, ctx, for_update=True)
|
|
if execution is None:
|
|
return BillingSummary(ctx.owner_id, ctx.user_id, [])
|
|
ctx.billing_execution_id = execution.id
|
|
if execution.status == LlmBillingExecutionStatus.REFUNDED.value:
|
|
return BillingSummary(
|
|
ctx.owner_id,
|
|
ctx.user_id,
|
|
[BillingItem(ctx.charge_kind, to_float(execution.pre_deduct_credits), False, "already_refunded", ctx.refund_biz_key, ctx.attempt_no)],
|
|
)
|
|
if execution.status == LlmBillingExecutionStatus.SUCCEEDED.value:
|
|
# 调用方只有在业务最终失败时才能进这里；允许从业务成功调用记录转最终失败退款。
|
|
pass
|
|
execution.status = LlmBillingExecutionStatus.FINAL_FAILED.value
|
|
execution.final_error_message = str(error or "业务最终失败")[:1000]
|
|
execution.completed_at = utc_now()
|
|
_log(ctx, LlmBillingEvent.FINAL_FAILURE_START, status="started", error=error)
|
|
try:
|
|
refunded = await refund_consumption(
|
|
db,
|
|
user_id=ctx.user_id,
|
|
refund_for_biz_key=ctx.pre_deduct_biz_key,
|
|
description=f"{execution.scene_name_snapshot}最终失败",
|
|
related_id=ctx.related_id or ctx.owner_id,
|
|
biz_key=f"{ctx.pre_deduct_biz_key}:business-final-refund",
|
|
record_meta={
|
|
"owner_type": ctx.owner_type,
|
|
"owner_id": ctx.owner_id,
|
|
"attempt_no": ctx.attempt_no,
|
|
"charge_kind": ctx.charge_kind,
|
|
"charge_action": CreditRecordAction.REFUND.value,
|
|
"credit_subject": CreditRecordSubject.REFUND.value,
|
|
"billing_scene": ctx.billing_scene,
|
|
"scene_name_snapshot": execution.scene_name_snapshot,
|
|
"source_module": ctx.source_module,
|
|
"source_project_id": ctx.source_project_id,
|
|
"source_step_id": ctx.source_step_id,
|
|
"source_step_code": ctx.source_step_code,
|
|
"llm_billing_execution_id": execution.id,
|
|
},
|
|
refund_time=utc_now(),
|
|
)
|
|
execution.refund_available_credits = refunded.available_amount
|
|
execution.refund_expired_credits = refunded.expired_amount
|
|
execution.status = LlmBillingExecutionStatus.REFUNDED.value
|
|
execution.refunded_at = utc_now()
|
|
_log(
|
|
ctx,
|
|
LlmBillingEvent.FINAL_FAILURE_REFUND_SUCCESS,
|
|
refund_available=to_float(refunded.available_amount),
|
|
refund_expired=to_float(refunded.expired_amount),
|
|
)
|
|
return BillingSummary(
|
|
ctx.owner_id,
|
|
ctx.user_id,
|
|
[BillingItem(ctx.charge_kind, to_float(refunded.total_amount), True, None, ctx.refund_biz_key, ctx.attempt_no)],
|
|
)
|
|
except Exception as exc:
|
|
execution.status = LlmBillingExecutionStatus.REFUND_FAILED.value
|
|
_log(ctx, LlmBillingEvent.FINAL_FAILURE_REFUND_FAILED, status="failed", error=str(exc))
|
|
raise
|
|
|
|
|
|
async def refund_pre_deduct(db: AsyncSession, ctx: LlmBillingContext, *, reason: str = "failure") -> BillingItem:
|
|
summary = await refund_on_final_failure(db, ctx, error=reason)
|
|
return summary.items[0] if summary.items else BillingItem(ctx.charge_kind, 0.0, False, "missing", ctx.refund_biz_key, ctx.attempt_no)
|
|
|
|
|
|
async def finalize_llm_business_failure(
|
|
ctx: LlmBillingContext,
|
|
*,
|
|
error: str | None = None,
|
|
) -> BillingSummary:
|
|
"""在独立短事务中完成最终失败退款，并确保退款失败状态不会被业务 rollback 吞掉。"""
|
|
try:
|
|
async with AsyncSessionLocal() as session:
|
|
async with session.begin():
|
|
return await refund_on_final_failure(session, ctx, error=error)
|
|
except Exception as exc:
|
|
try:
|
|
async with AsyncSessionLocal() as audit_session:
|
|
async with audit_session.begin():
|
|
execution = await _find_execution(audit_session, ctx, for_update=True)
|
|
if execution is not None and execution.status != LlmBillingExecutionStatus.REFUNDED.value:
|
|
execution.status = LlmBillingExecutionStatus.REFUND_FAILED.value
|
|
execution.final_error_message = str(error or exc)[:1000]
|
|
execution.completed_at = utc_now()
|
|
except Exception:
|
|
_log(ctx, LlmBillingEvent.FINAL_FAILURE_REFUND_FAILED, status="failed", error=str(exc), persist_failed_status=False)
|
|
raise
|