493 lines
19 KiB
Python
493 lines
19 KiB
Python
"""EmbeddingClient: 治理化 embedding 调用(M2 设计 §7,方案 G2)。
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独立精简治理循环,**复用**库的算法件: `RateLimiter`/`ProviderGate` 端口与
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两种后端、错误四分类、`backoff_delay` 退避公式、`SourceCooldownMemo`、
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`TelemetryEmitter`(遥测单一 helper 铁律)。选源/等待循环与 RetryMW 同构
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——这是设计 §7.1 已声明的有限重复(chat 循环含流式/结构化/缓存分支,
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强行合一才是复制);行为口径(stall 双条件、记账降级、取消穿透)与 chat
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完全一致。
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对参考实现的已声明裁决(设计 §7.3): async httpx;返回 list[list[float]]
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(核心不依赖 numpy);normalize 开关(VT 语义,防除零 max(norm,1e-12));
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必填 batch_size 批间串行;GovDoc 自研退避与 on_usage 回调、VT 同步接口
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均**有意放弃**。
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"""
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from __future__ import annotations
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import asyncio
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import math
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import random
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import time
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import uuid
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from dataclasses import dataclass
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from typing import TYPE_CHECKING
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from loguru import logger
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from polygateway.config import EmbeddingSettings
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from polygateway.errors import (
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AllSourcesExhausted,
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CircuitOpenError,
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GovernanceBackendError,
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PolyGatewayError,
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RequestRejectedError,
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ResultInvalidError,
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SourceDeadError,
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TransientError,
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)
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from polygateway.middleware.breaker import BreakerGate
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from polygateway.middleware.ratelimit import QuotaGate
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from polygateway.middleware.retry import _failure_reason, backoff_delay
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from polygateway.middleware.telemetry import TelemetryEmitter
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from polygateway.sources import SourceCooldownMemo
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from polygateway.types import ChatRequest, EmbeddingResponse, LLMResponse
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if TYPE_CHECKING:
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from collections.abc import Awaitable, Callable, Mapping
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from polygateway.ports import (
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EmbeddingTransport,
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GateDecision,
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Permit,
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ProviderGate,
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RateLimiter,
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SourceSelector,
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TelemetryRecorder,
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)
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from polygateway.pricing import PricingTable
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from polygateway.types import (
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BackpressurePolicy,
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EmbeddingTransportResult,
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RetryPolicy,
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SourceConfig,
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)
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_TELEMETRY_TEXT_CAP = 200 # 遥测行每条 text 截断长度(原文不整段入库,VT R12)
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@dataclass(frozen=True)
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class _FailedBatch:
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exc: PolyGatewayError
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immediate: bool
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@dataclass(frozen=True)
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class _BatchOutcome:
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result: EmbeddingTransportResult
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source: SourceConfig
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call_id: str
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latency_ms: int
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class EmbeddingClient:
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"""治理化 embedding 入口;与 GatewayClient 共享后端实例即共享全局闸。"""
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def __init__(
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self,
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*,
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scope: str,
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sources: list[SourceConfig],
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selector: SourceSelector,
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limiter: RateLimiter,
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breaker: ProviderGate,
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transport: EmbeddingTransport,
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retry: RetryPolicy,
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backpressure: BackpressurePolicy,
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quota_full: str = "wait",
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telemetry: TelemetryRecorder | None = None,
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pricing: PricingTable | None = None,
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batch_size: int,
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normalize: bool = False,
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expected_dim: int | None = None,
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now: Callable[[], float] = time.monotonic,
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sleep: Callable[[float], Awaitable[None]] = asyncio.sleep,
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rng: Callable[[], float] = random.random,
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) -> None:
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if batch_size < 1:
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raise ValueError("batch_size 必须 ≥ 1")
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if quota_full not in ("wait", "fail_fast"):
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raise ValueError(f"quota_full 必须是 wait|fail_fast: {quota_full!r}")
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if expected_dim is not None and expected_dim < 1:
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raise ValueError("expected_dim 必须 ≥ 1")
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self._scope = scope
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self._sources = list(sources)
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self._selector = selector
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self._quota = QuotaGate(limiter)
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self._breaker = BreakerGate(breaker)
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self._transport = transport
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self._retry = retry
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self._bp = backpressure
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self._quota_full = quota_full
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self._emitter = TelemetryEmitter(telemetry, pricing=pricing) if telemetry else None
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self._telemetry = telemetry
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self._pricing = pricing
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self._batch_size = batch_size
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self._normalize = normalize
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self._expected_dim = expected_dim
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self._memo = SourceCooldownMemo(now=now)
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self._now = now
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self._sleep = sleep
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self._rng = rng
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self._closed = False
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async def embed(
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self,
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texts: list[str],
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*,
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session_id: str | None = None,
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parent_call_id: str | None = None,
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) -> EmbeddingResponse:
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"""一次治理 embedding 调用: 按 batch_size 切批,批间串行,全批合并返回。"""
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if not isinstance(texts, list) or any(not isinstance(t, str) for t in texts):
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raise TypeError("texts 必须是 list[str](显式优于隐式,不收单条 str)")
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if not texts:
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return EmbeddingResponse(
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vectors=[],
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dim=0,
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model="",
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provider="",
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prompt_tokens=0,
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usage_source="measured",
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latency_ms=0,
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call_id=str(uuid.uuid4()),
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source_name="",
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)
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if not self._sources:
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raise AllSourcesExhausted(scope=self._scope, reason="no_sources", retry_after_s=0.0)
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outcomes = []
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for start in range(0, len(texts), self._batch_size):
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outcomes.append(
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await self._embed_batch(
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texts[start : start + self._batch_size], session_id, parent_call_id
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)
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)
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return self._merge(outcomes)
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# —— 治理循环(与 RetryMW 同构;设计 §7.1 已声明的有限重复)——
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async def _embed_batch(
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self, batch: list[str], session_id: str | None, parent_call_id: str | None
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) -> _BatchOutcome:
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fails = 0
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reasons: dict[str, str] = {}
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entered_at = self._now()
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while True:
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picked, gate_rejections = await self._pick_runnable(reasons)
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if picked is None:
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await self._on_no_runnable(gate_rejections, reasons, entered_at)
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continue
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outcome = await self._attempt(batch, *picked, reasons, session_id, parent_call_id)
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if isinstance(outcome, _BatchOutcome):
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return outcome
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fails += 1
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if fails >= self._retry.max_attempts:
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raise AllSourcesExhausted(
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scope=self._scope,
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reason="retry_exhausted",
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retry_after_s=self._retry.backoff_base_s,
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per_source_reasons=reasons,
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) from outcome.exc
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if not outcome.immediate:
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await self._sleep(backoff_delay(self._retry, fails, outcome.exc, self._rng))
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async def _pick_runnable(
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self, reasons: dict[str, str]
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) -> tuple[tuple[SourceConfig, Permit, GateDecision] | None, int]:
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stats = {s.name: await self._quota.stats(s) for s in self._sources}
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gate_rejections = 0
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for cand in self._selector.order(self._sources, stats):
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if self._memo.active(cand.name):
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gate_rejections += 1
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reasons[cand.name] = "cooldown"
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continue
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permit = await self._quota.try_acquire(cand)
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if permit is None:
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reasons.setdefault(cand.name, "rate_limited")
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continue
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entry = None
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try:
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entry = await self._breaker.try_enter(cand, uuid.uuid4().hex)
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finally:
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if entry is None:
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await self._settle_and_release(permit, 0)
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if entry.allowed:
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return (cand, permit, entry), gate_rejections
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gate_rejections += 1
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reasons[cand.name] = "circuit_open"
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self._memo.set_until(cand.name, self._now() + entry.retry_after_s)
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await self._settle_and_release(permit, 0)
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return None, gate_rejections
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async def _on_no_runnable(
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self, gate_rejections: int, reasons: dict[str, str], entered_at: float
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) -> None:
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if gate_rejections == len(self._sources):
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names = tuple(s.name for s in self._sources)
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raise CircuitOpenError(
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scope=self._scope,
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retry_after_s=await self._breaker.retry_after_s(names),
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per_source_reasons=reasons,
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)
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if self._quota_full == "fail_fast":
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raise AllSourcesExhausted(
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scope=self._scope,
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reason="quota_exhausted",
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retry_after_s=self._bp.poll_interval_s,
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per_source_reasons=reasons,
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)
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stall = self._bp.stall_window_s
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if self._now() - entered_at > stall and await self._quota.progress_age_s() > stall:
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names = tuple(s.name for s in self._sources)
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raise AllSourcesExhausted(
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scope=self._scope,
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reason="stalled",
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retry_after_s=await self._breaker.retry_after_s(names),
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per_source_reasons=reasons,
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)
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await self._sleep(self._bp.poll_interval_s * (0.5 + 0.5 * self._rng()))
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async def _attempt(
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self,
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batch: list[str],
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source: SourceConfig,
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permit: Permit,
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entry: GateDecision,
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reasons: dict[str, str],
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session_id: str | None,
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parent_call_id: str | None,
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) -> _BatchOutcome | _FailedBatch:
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call_id = str(uuid.uuid4())
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started = self._now()
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actual = 0
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try:
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result = await self._transport.embed(texts=batch, source=source, call_id=call_id)
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if self._expected_dim is not None and result.dim != self._expected_dim:
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raise ResultInvalidError(
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f"{source.name} 维度 {result.dim} 不符期望 {self._expected_dim}",
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source_name=source.name,
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operation="embedding",
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)
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actual = result.prompt_tokens
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await self._record_quietly(self._breaker.record_success(entry))
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await self._record_quietly(self._quota.mark_progress())
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latency_ms = int((self._now() - started) * 1000)
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await self._emit(batch, source, call_id, started, session_id, parent_call_id, result)
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return _BatchOutcome(result, source, call_id, latency_ms)
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except (RequestRejectedError, ResultInvalidError) as exc:
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await self._gate_on_terminal(exc, entry)
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await self._emit(batch, source, call_id, started, session_id, parent_call_id, error=exc)
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raise
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except asyncio.CancelledError:
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if entry.is_probe:
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await self._record_quietly(self._breaker.release_probe(entry))
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await self._emit(
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batch, source, call_id, started, session_id, parent_call_id, error="cancelled"
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)
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raise
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except (SourceDeadError, TransientError) as exc:
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dead = isinstance(exc, SourceDeadError)
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reason = _failure_reason(exc)
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reasons[source.name] = reason
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await self._record_quietly(self._breaker.record_failure(entry, reason, dead))
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if not dead:
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actual = source.est_tokens # 保守: 失败请求可能已被网关计费(CHS 同款)
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await self._emit(batch, source, call_id, started, session_id, parent_call_id, error=exc)
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return _FailedBatch(exc, immediate=dead)
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finally:
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await self._settle_and_release(permit, actual)
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# —— 辅助 ——
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async def _gate_on_terminal(self, exc: PolyGatewayError, entry: GateDecision) -> None:
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"""终态异常的门控写回(与 RetryMW 同口径): 坏结果/网关健康拒绝 ≠ 坏服务
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→ 记成功;网关没响应的拒绝若持探针则归还。"""
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if isinstance(exc, ResultInvalidError) or exc.status_code is not None:
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await self._record_quietly(self._breaker.record_success(entry))
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elif entry.is_probe:
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await self._record_quietly(self._breaker.release_probe(entry))
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async def _record_quietly(self, write_back: Awaitable[object]) -> None:
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"""记账侧写回降级(与 RetryMW._record_quietly 同口径,设计 §10)。"""
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try:
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await write_back
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except asyncio.CancelledError:
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raise
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except GovernanceBackendError as exc:
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logger.warning("embedding 治理记账写回降级(不冒泡): {}", exc)
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async def _settle_and_release(self, permit: Permit, actual: int) -> None:
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try:
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try:
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await permit.settle(actual)
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finally:
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await permit.release()
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except asyncio.CancelledError:
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raise
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except Exception as exc:
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logger.warning("embedding permit 结算/释放失败(不掩盖主异常): {}", exc)
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async def _emit(
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self,
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batch: list[str],
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source: SourceConfig,
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call_id: str,
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started: float,
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session_id: str | None,
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parent_call_id: str | None,
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result: EmbeddingTransportResult | None = None,
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error: object | None = None,
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) -> None:
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"""逐批遥测(经同一 Emitter): messages=截断 texts、向量绝不入库。"""
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if self._emitter is None:
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return
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request = ChatRequest(
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messages=[{"role": "user", "content": t[:_TELEMETRY_TEXT_CAP]} for t in batch],
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session_id=session_id,
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parent_call_id=parent_call_id,
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)
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response = None
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if result is not None:
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response = LLMResponse(
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content=f"<vectors n={len(result.vectors)} dim={result.dim}>",
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thinking="",
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model=source.model,
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provider=source.provider,
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prompt_tokens=result.prompt_tokens,
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completion_tokens=0,
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latency_ms=int((self._now() - started) * 1000),
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ttft_ms=None,
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max_inter_token_ms=None,
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cache_hit=False,
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call_id=call_id,
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source_name=source.name,
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usage_source=result.usage_source,
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)
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await self._emitter.emit_attempt(
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request=request,
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source=source,
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call_id=call_id,
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latency_ms=int((self._now() - started) * 1000),
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response=response,
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error=None if error is None else str(error),
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)
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def _merge(self, outcomes: list[_BatchOutcome]) -> EmbeddingResponse:
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"""全批合并(设计 §7.3): vectors 拼接、tokens/latency 求和、保守 usage_source。"""
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vectors = [v for o in outcomes for v in o.result.vectors]
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if self._normalize:
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vectors = [_l2_normalize(v) for v in vectors]
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first = outcomes[0]
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prompt_tokens = sum(o.result.prompt_tokens for o in outcomes)
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estimated = any(o.result.usage_source == "estimated" for o in outcomes)
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return EmbeddingResponse(
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vectors=vectors,
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dim=first.result.dim,
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model=first.source.model,
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provider=first.source.provider,
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prompt_tokens=prompt_tokens,
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usage_source="estimated" if estimated else "measured",
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latency_ms=sum(o.latency_ms for o in outcomes),
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call_id=first.call_id,
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source_name=first.source.name,
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cost=self._total_cost(outcomes),
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)
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def _total_cost(self, outcomes: list[_BatchOutcome]) -> float | None:
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if self._pricing is None:
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return None
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costs = [self._pricing.cost(o.source.model, o.result.prompt_tokens, 0) for o in outcomes]
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known = [c for c in costs if c is not None]
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return sum(known) if known else None
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async def aclose(self) -> None:
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"""幂等释放 transport 连接池与遥测连接(与 GatewayClient 对称)。"""
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if self._closed:
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return
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self._closed = True
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transport_aclose = getattr(self._transport, "aclose", None)
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if transport_aclose is not None:
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await transport_aclose()
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telemetry_aclose = getattr(self._telemetry, "aclose", None)
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if telemetry_aclose is not None:
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await telemetry_aclose()
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else:
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telemetry_close = getattr(self._telemetry, "close", None)
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if telemetry_close is not None:
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telemetry_close()
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async def __aenter__(self) -> EmbeddingClient:
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return self
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async def __aexit__(self, *exc_info: object) -> None:
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await self.aclose()
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# —— 工厂(与 GatewayClient 对称)——
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@classmethod
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def from_settings(
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cls,
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settings: EmbeddingSettings,
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*,
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limiter: RateLimiter | None = None,
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breaker: ProviderGate | None = None,
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telemetry: TelemetryRecorder | None = None,
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registry: Mapping[str, object] | None = None,
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) -> EmbeddingClient:
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"""按配置装配;显式传入的后端实例即共享(与 chat scope 共享全局闸)。"""
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from polygateway.client import (
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_build_breaker,
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_build_limiter,
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_build_selector,
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_build_telemetry,
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)
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from polygateway.pricing import PricingTable
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from polygateway.transports.openai_compat import OpenAICompatTransport
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gw = settings.gateway
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sources = list(gw.sources)
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return cls(
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scope=gw.scope,
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sources=sources,
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selector=_build_selector(gw.selector),
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limiter=limiter or _build_limiter(gw, sources),
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breaker=breaker or _build_breaker(gw),
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transport=OpenAICompatTransport(registry=registry),
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retry=gw.retry,
|
|
backpressure=gw.backpressure,
|
|
quota_full=gw.quota_full,
|
|
telemetry=telemetry if telemetry is not None else _build_telemetry(gw),
|
|
pricing=PricingTable.from_file(gw.pricing_path)
|
|
if gw.pricing_path is not None
|
|
else None,
|
|
batch_size=settings.batch_size,
|
|
normalize=settings.normalize,
|
|
expected_dim=settings.expected_dim,
|
|
)
|
|
|
|
@classmethod
|
|
def from_env(
|
|
cls,
|
|
scope: str = "EMBED",
|
|
*,
|
|
limiter: RateLimiter | None = None,
|
|
breaker: ProviderGate | None = None,
|
|
telemetry: TelemetryRecorder | None = None,
|
|
registry: Mapping[str, object] | None = None,
|
|
env: Mapping[str, str] | None = None,
|
|
) -> EmbeddingClient:
|
|
"""从 .env/环境变量装配一个 embedding scope 的 client。"""
|
|
return cls.from_settings(
|
|
EmbeddingSettings.from_env(scope, env=env),
|
|
limiter=limiter,
|
|
breaker=breaker,
|
|
telemetry=telemetry,
|
|
registry=registry,
|
|
)
|
|
|
|
|
|
def _l2_normalize(vector: list[float]) -> list[float]:
|
|
"""L2 归一化;`max(norm, 1e-12)` 防除零(VT embedding.py:167-170 语义)。"""
|
|
norm = max(math.sqrt(sum(x * x for x in vector)), 1e-12)
|
|
return [x / norm for x in vector]
|