269 lines
10 KiB
Python
269 lines
10 KiB
Python
import os
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from collections.abc import Mapping
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from dataclasses import dataclass
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from typing import Any, Protocol, cast
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import httpx
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from sqlalchemy import select
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from app.core.errors import (
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DependencyUnavailableError,
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RecoverableAgentError,
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UpstreamTimeoutError,
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)
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from app.infrastructure.db import SessionFactory
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from app.model.configuration import ModelEndpointConfig
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class ModelGateway(Protocol):
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async def generate(self, *, endpoint_code: str, prompt: str, timeout_ms: int) -> str: ...
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async def embed(self, *, endpoint_code: str, text: str, timeout_ms: int) -> list[float]: ...
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class EndpointSettings(Protocol):
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endpoint_code: str
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base_url: str
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model_name: str
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secret_ref: str
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class EnvironmentSecretResolver:
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def resolve(self, secret_ref: str) -> str:
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if not secret_ref.startswith("env:"):
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raise RecoverableAgentError("模型密钥必须使用 env: 引用")
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name = secret_ref.removeprefix("env:")
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value = os.getenv(name)
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if not value:
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raise RecoverableAgentError("模型密钥未配置")
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return value
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class OpenAICompatibleGateway:
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"""供应商无关的 Chat Completions Adapter；密钥只从 secret_ref 解析。"""
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def __init__(
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self,
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endpoints: Mapping[str, EndpointSettings],
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*,
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secret_resolver: EnvironmentSecretResolver | None = None,
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client: httpx.AsyncClient | None = None,
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) -> None:
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self.endpoints = endpoints
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self.secret_resolver = secret_resolver or EnvironmentSecretResolver()
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self.client = client
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self._owns_client = client is None
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async def generate(self, *, endpoint_code: str, prompt: str, timeout_ms: int) -> str:
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endpoint = self.endpoints.get(endpoint_code)
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if endpoint is None:
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raise RecoverableAgentError("模型端点未注册")
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token = self.secret_resolver.resolve(endpoint.secret_ref)
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url = endpoint.base_url.rstrip("/") + "/chat/completions"
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payload = {
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"model": endpoint.model_name,
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"messages": [{"role": "user", "content": prompt}],
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"temperature": 0,
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}
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client = self.client or httpx.AsyncClient()
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try:
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response = await client.post(
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url,
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headers={"Authorization": f"Bearer {token}", "Content-Type": "application/json"},
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json=payload,
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timeout=httpx.Timeout(timeout_ms / 1000),
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)
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response.raise_for_status()
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body: Any = response.json()
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content = body.get("choices", [{}])[0].get("message", {}).get("content")
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if not isinstance(content, str) or not content.strip():
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raise DependencyUnavailableError("模型响应缺少文本")
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return content
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except httpx.TimeoutException as exc:
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raise UpstreamTimeoutError("模型端点调用超时") from exc
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except httpx.HTTPError as exc:
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raise DependencyUnavailableError("模型端点调用失败") from exc
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finally:
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if self._owns_client:
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await client.aclose()
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async def embed(self, *, endpoint_code: str, text: str, timeout_ms: int) -> list[float]:
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"""OpenAI-compatible Embeddings Adapter；密钥同样只从 secret_ref 解析。"""
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endpoint = self.endpoints.get(endpoint_code)
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if endpoint is None:
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raise RecoverableAgentError("模型端点未注册")
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token = self.secret_resolver.resolve(endpoint.secret_ref)
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url = endpoint.base_url.rstrip("/") + "/embeddings"
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payload = {"model": endpoint.model_name, "input": text}
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client = self.client or httpx.AsyncClient()
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try:
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response = await client.post(
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url,
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headers={"Authorization": f"Bearer {token}", "Content-Type": "application/json"},
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json=payload,
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timeout=httpx.Timeout(timeout_ms / 1000),
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)
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response.raise_for_status()
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body: Any = response.json()
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vector = _first_embedding(body)
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if vector is None:
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raise DependencyUnavailableError("向量响应缺少 embedding")
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return vector
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except httpx.TimeoutException as exc:
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raise UpstreamTimeoutError("向量端点调用超时") from exc
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except httpx.HTTPError as exc:
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raise DependencyUnavailableError("向量端点调用失败") from exc
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finally:
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if self._owns_client:
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await client.aclose()
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def _first_embedding(body: Any) -> list[float] | None:
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"""取 OpenAI-compatible 响应的首条向量；结构不符时返回 None，由调用方失败关闭。"""
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data = body.get("data") if isinstance(body, dict) else None
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if not isinstance(data, list) or not data:
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return None
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entry = data[0]
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raw = entry.get("embedding") if isinstance(entry, dict) else None
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if not isinstance(raw, list) or not raw:
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return None
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try:
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return [float(value) for value in raw]
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except (TypeError, ValueError):
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return None
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class DatabaseModelGateway:
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"""从当前数据库端点配置动态构造已批准的 OpenAI-compatible Adapter。"""
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async def _endpoint(self, endpoint_code: str) -> ModelEndpointConfig:
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async with SessionFactory() as session:
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endpoint = await session.scalar(select(ModelEndpointConfig).where(
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ModelEndpointConfig.endpoint_code == endpoint_code,
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ModelEndpointConfig.status == "active",
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))
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if endpoint is None:
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raise RecoverableAgentError("模型端点未注册或未激活")
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return endpoint
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async def generate(self, *, endpoint_code: str, prompt: str, timeout_ms: int) -> str:
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endpoint = await self._endpoint(endpoint_code)
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adapter = OpenAICompatibleGateway(
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{endpoint.endpoint_code: cast(EndpointSettings, endpoint)}
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)
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return await adapter.generate(
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endpoint_code=endpoint.endpoint_code, prompt=prompt, timeout_ms=timeout_ms
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)
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async def embed(self, *, endpoint_code: str, text: str, timeout_ms: int) -> list[float]:
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endpoint = await self._endpoint(endpoint_code)
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adapter = OpenAICompatibleGateway(
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{endpoint.endpoint_code: cast(EndpointSettings, endpoint)}
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)
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return await adapter.embed(
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endpoint_code=endpoint.endpoint_code, text=text, timeout_ms=timeout_ms
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)
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class DatabaseModelEndpointResolver:
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"""为统一意图分类提供当前已激活模型端点快照。"""
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async def resolve(self, *, agent_type: str, task_type: str) -> list[ModelEndpointConfig]:
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del agent_type, task_type # 路由筛选由发布配置和 ModelRouterService 扩展。
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async with SessionFactory() as session:
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return list(await session.scalars(select(ModelEndpointConfig).where(
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ModelEndpointConfig.status == "active"
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)))
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@dataclass(frozen=True)
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class ModelExecution:
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endpoint_code: str
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text: str
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attempts: int
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degraded: bool = False
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@dataclass(frozen=True)
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class ModelEmbedding:
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endpoint_code: str
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vector: list[float]
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attempts: int
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degraded: bool = False
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class ModelDispatchService:
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"""Executes only router-approved endpoints and falls back in declared order."""
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def __init__(self, gateway: ModelGateway) -> None:
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self.gateway = gateway
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async def generate(
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self,
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endpoints: list[Any],
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prompt: str,
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*,
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max_attempts: int = 2,
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) -> ModelExecution:
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last_error: Exception | None = None
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attempts = 0
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for endpoint in endpoints[: max(1, max_attempts)]:
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attempts += 1
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try:
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text = await self.gateway.generate(
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endpoint_code=endpoint.endpoint_code,
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prompt=prompt,
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timeout_ms=endpoint.timeout_ms,
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)
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return ModelExecution(endpoint.endpoint_code, text, attempts, attempts > 1)
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except Exception as exc:
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last_error = exc
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raise RecoverableAgentError("所有已批准模型端点调用失败") from last_error
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async def embed(
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self, endpoints: list[Any], text: str, *, max_attempts: int = 2
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) -> ModelEmbedding:
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"""与文本生成同族的受控降级：按声明顺序尝试，成功即返回并标记是否降级。"""
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last_error: Exception | None = None
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attempts = 0
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for endpoint in endpoints[: max(1, max_attempts)]:
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attempts += 1
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try:
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vector = await self.gateway.embed(
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endpoint_code=endpoint.endpoint_code,
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text=text,
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timeout_ms=endpoint.timeout_ms,
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)
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return ModelEmbedding(endpoint.endpoint_code, vector, attempts, attempts > 1)
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except Exception as exc:
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last_error = exc
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raise RecoverableAgentError("所有已批准向量端点调用失败") from last_error
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class ModelGenerationService:
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"""业务 Agent 的唯一模型生成入口。路由结果必须先由 ModelRouterService 给出。"""
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def __init__(self, dispatch: ModelDispatchService) -> None:
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self.dispatch = dispatch
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async def generate(
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self, endpoints: list[Any], prompt: str, *, max_attempts: int = 2
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) -> ModelExecution:
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if not endpoints:
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raise RecoverableAgentError("没有可用的已批准模型端点")
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return await self.dispatch.generate(endpoints, prompt, max_attempts=max_attempts)
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class ModelEmbeddingService:
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"""文本向量化入口（记忆语义召回等只读用途），与生成同样必须先经过端点解析。"""
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def __init__(self, dispatch: ModelDispatchService) -> None:
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self.dispatch = dispatch
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async def embed(
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self, endpoints: list[Any], text: str, *, max_attempts: int = 2
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) -> ModelEmbedding:
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if not endpoints:
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raise RecoverableAgentError("没有可用的已批准向量端点")
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return await self.dispatch.embed(endpoints, text, max_attempts=max_attempts)
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