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https://github.com/diegosouzapw/OmniRoute.git
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3c9883bb73
OmniRoute v3.8.29 — 115 commits since v3.8.28. Full CHANGELOG + 41 i18n mirrors. All content quality gates green (build, unit 8/8, vitest 188/188, PR test policy, quality gates extended, docs sync, quality ratchet). Remaining red CI checks are pre-existing release flakes (coverage-shard/integration/node-compat teardown), a new transitive undici advisory in electron devDeps, and a workflow-level CodeQL fail (0 open alerts). VPS-validated by the operator.
2605 lines
102 KiB
TypeScript
2605 lines
102 KiB
TypeScript
/**
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* Shared combo (model combo) handling with fallback support
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* Supports: priority, weighted, round-robin, random, least-used, cost-optimized,
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* reset-aware, reset-window, strict-random, auto, fill-first, p2c, lkgp,
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* context-optimized, and context-relay strategies
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*/
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import {
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checkFallbackError,
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classifyErrorText,
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classifyLockoutReason,
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decayModelFailureCount,
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formatRetryAfter,
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getRuntimeProviderProfile,
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isModelLocked,
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recordModelLockoutFailure,
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recordProviderFailure,
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isProviderExhaustedReason,
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hasPerModelQuota,
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} from "./accountFallback.ts";
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import { FETCH_TIMEOUT_MS, RateLimitReason } from "../config/constants.ts";
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import { errorResponse, unavailableResponse } from "../utils/error.ts";
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import {
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recordComboIntent,
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recordComboRequest,
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recordComboShadowRequest,
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getComboMetrics,
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} from "./comboMetrics.ts";
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import {
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resolveComboConfig,
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getDefaultComboConfig,
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resolveComboTargetTimeoutMs,
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} from "./comboConfig.ts";
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import {
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maybeGenerateHandoff,
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resolveContextRelayConfig,
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maybeGenerateUniversalHandoff,
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injectUniversalHandoffBody,
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resolveUniversalHandoffConfig,
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SKIP_UNIVERSAL_HANDOFF_FLAG,
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type MessageLike,
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} from "./contextHandoff.ts";
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import {
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recordSessionModelUsage,
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getLastSessionModel,
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getHandoff,
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} from "../../src/lib/db/contextHandoffs.ts";
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import { extractSessionAffinityKey } from "@/sse/services/auth";
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import { resolveModelLockoutSettings } from "../../src/lib/resilience/modelLockoutSettings";
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import { fetchCodexQuota } from "./codexQuotaFetcher.ts";
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import { getQuotaFetcher } from "./quotaPreflight.ts";
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import * as semaphore from "./rateLimitSemaphore.ts";
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import { getCircuitBreaker } from "../../src/shared/utils/circuitBreaker";
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import { fisherYatesShuffle, getNextFromDeck } from "../../src/shared/utils/shuffleDeck";
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import { parseModel } from "./model.ts";
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import { applyComboAgentMiddleware } from "./comboAgentMiddleware.ts";
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import { checkCredentialGate, logCredentialSkip } from "./credentialGate.ts";
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import { emit } from "../../src/lib/events/eventBus";
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import { notifyWebhookEvent } from "../../src/lib/webhookDispatcher";
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import { classifyWithConfig } from "./intentClassifier.ts";
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import { selectProvider as selectAutoProvider } from "./autoCombo/engine.ts";
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import { selectWithStrategy } from "./autoCombo/routerStrategy.ts";
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import { parseAutoPrefix } from "./autoCombo/autoPrefix.ts";
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import { handlePipelineCombo, buildPipelineResponse } from "./autoCombo/pipelineRouter.ts";
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import {
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DEFAULT_WEIGHTS,
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type ProviderCandidate,
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type ScoringWeights,
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} from "./autoCombo/scoring.ts";
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import { supportsToolCalling } from "./modelCapabilities.ts";
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import { estimateTokens } from "./contextManager.ts";
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import { getSessionConnection } from "./sessionManager.ts";
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import { orderTargetsByEvalScores } from "./evalRouting.ts";
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import { generateRoutingHints } from "./manifestAdapter";
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import type { RoutingHint } from "./manifestAdapter";
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import { buildComplexityRoutingHint } from "./autoCombo/complexityRouter";
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import type { CompressionMode } from "./compression/types.ts";
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import { getProviderConnections } from "../../src/lib/db/providers";
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import { normalizeRoutingStrategy } from "../../src/shared/constants/routingStrategies.ts";
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import {
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isProviderInCooldown,
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recordProviderCooldown,
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recordProviderSuccess,
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} from "./providerCooldownTracker.ts";
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import {
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resolveResilienceSettings,
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type ResilienceSettings,
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} from "../../src/lib/resilience/settings";
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import { resolveReasoningBufferedMaxTokens, toPositiveInteger } from "./reasoningTokenBuffer.ts";
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import { RESET_WINDOW_NAMES } from "./combo/types.ts";
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import type {
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ComboRetryAfter,
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ComboErrorBody,
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SingleModelTarget,
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HandleComboChatOptions,
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HandleRoundRobinOptions,
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ResolvedComboTarget,
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AutoProviderCandidate,
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HistoricalLatencyStatsEntry,
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} from "./combo/types.ts";
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import {
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MAX_RR_COUNTERS,
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rrCounters,
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rrStickyTargets,
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clampStickyRoundRobinTargetLimit,
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getStickyRoundRobinStartIndex,
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recordStickyRoundRobinSuccess,
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} from "./combo/rrState.ts";
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import { validateResponseQuality, toRetryAfterDisplayValue } from "./combo/validateQuality.ts";
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import {
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TRANSIENT_FOR_SEMAPHORE,
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MAX_FALLBACK_WAIT_MS,
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MAX_GLOBAL_ATTEMPTS,
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isAllAccountsRateLimitedResponse,
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isProviderCircuitOpenResult,
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clampComboDepth,
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shouldSkipForPredictedTtft,
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shouldRecordProviderBreakerFailure,
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resolveDelayMs,
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comboModelNotFoundResponse,
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isStreamReadinessFailureErrorBody,
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isTokenLimitBreachErrorBody,
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toRecordedTarget,
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} from "./combo/comboPredicates.ts";
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import { dedupeTargetsByExecutionKey, isRecord } from "./combo/comboData.ts";
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import { resolveShadowTargets, scheduleShadowRouting } from "./combo/shadowRouting.ts";
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import {
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sortTargetsByCost,
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sortTargetsByUsage,
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orderTargetsByPowerOfTwoChoices,
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} from "./combo/targetSorters.ts";
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import {
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filterTargetsByRequestCompatibility,
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getModelContextLimitForModelString,
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resolveComboTargets,
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resolveWeightedTargets,
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sortTargetsByContextSize,
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} from "./combo/comboStructure.ts";
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import {
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QUOTA_SOFT_DEPRIORITIZE_FACTOR,
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setCandidateQuotaSoftPenalty,
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_registerExecutionCandidates,
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_unregisterExecutionCandidates,
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extractPromptForIntent,
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mapIntentToTaskType,
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getIntentConfig,
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applyRequestTagRouting,
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scoreAutoTargets,
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expandAutoComboCandidatePool,
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deriveComboSessionKey,
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} from "./combo/autoStrategy.ts";
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import {
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resolveResetWindowConfig,
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resolveSlaRoutingPolicy,
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calculateResetWindowAffinity,
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type ResetWindowConfig,
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} from "./combo/quotaScoring.ts";
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import {
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fetchResetAwareQuotaWithCache,
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preScreenTargets,
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orderTargetsByResetAwareQuota,
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orderTargetsByResetWindow,
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type PreScreenResult,
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} from "./combo/quotaStrategies.ts";
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// Backward-compatible re-exports — these were public from combo.ts before the
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// types extraction (Quality Gate v2 / Fase 9). Keep the external surface stable.
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export { RESET_WINDOW_NAMES };
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// chatCore.ts's dynamic `import("../services/combo")` reads these two — keep them
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// re-exported from combo.ts after the auto-strategy extraction (combo split D8).
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export { QUOTA_SOFT_DEPRIORITIZE_FACTOR, setCandidateQuotaSoftPenalty };
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export { scoreAutoTargets, expandAutoComboCandidatePool };
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export type { SingleModelTarget, ResolvedComboTarget };
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export { validateResponseQuality };
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export { clampComboDepth, shouldSkipForPredictedTtft, shouldRecordProviderBreakerFailure };
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export { resolveShadowTargets, scheduleShadowRouting };
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// preScreenTargets was public from combo.ts before the reset-aware quota
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// extraction (combo split D7b). Keep the external surface stable.
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export { preScreenTargets };
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export { resolveComboTargets, filterTargetsByRequestCompatibility };
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export {
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getComboFromData,
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getComboModelsFromData,
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resolveNestedComboModels,
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resolveNestedComboTargets,
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validateComboDAG,
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} from "./combo/comboStructure.ts";
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// Reset-aware / reset-window quota config, scoring, and window-math helpers were
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// extracted to combo/quotaScoring.ts (pure) and the stateful cache + strategy
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// orderers to combo/quotaStrategies.ts (combo split D7b). The two cache Maps
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// (resetAwareConnectionCache, resetAwareQuotaCache) live as single instances in
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// quotaStrategies.ts alongside their only readers/writers (state cohesion).
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// combo.ts imports back the three reset-window helpers buildAutoCandidates +
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// orchestration need, plus the strategy orderers and preScreenTargets (above).
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// Bootstrap defaults from ClawRouter benchmark (used when no local latency history exists yet)
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const DEFAULT_MODEL_P95_MS: Record<string, number> = {
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"grok-4-fast-non-reasoning": 1143,
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"grok-4-1-fast-non-reasoning": 1244,
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"gemini-2.5-flash": 1238,
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"kimi-k2.5": 1646,
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"gpt-4o-mini": 2764,
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"claude-sonnet-4.6": 4000,
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"claude-opus-4.6": 6000,
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"deepseek-chat": 2000,
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};
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const MIN_HISTORY_SAMPLES = 10;
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// Assumed fraction of tokens that are output when blending input+output prices
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// for auto-combo cost scoring. 0.4 = 40% output, 60% input.
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// Matches the example in GitHub issue #1812 (e.g. o3-like model: $3 input/$15 output).
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const OUTPUT_TOKEN_RATIO = 0.4;
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function calculateTargetContextAffinity(
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target: ResolvedComboTarget,
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sessionId: string | null | undefined
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): number {
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const sessionConnectionId = getSessionConnection(sessionId || null);
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if (!sessionConnectionId) return 0.5;
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if (target.connectionId === sessionConnectionId) return 1;
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if (!target.connectionId) return 0.5;
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return 0.1;
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}
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function getBootstrapLatencyMs(modelId: string): number {
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const normalized = String(modelId || "").toLowerCase();
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return DEFAULT_MODEL_P95_MS[normalized] ?? 1500;
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}
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export async function buildAutoCandidates(
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targets: ResolvedComboTarget[],
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comboName: string,
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sessionId: string | null | undefined = null,
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resetWindowConfig: ResetWindowConfig = resolveResetWindowConfig(null)
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): Promise<AutoProviderCandidate[]> {
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const metrics = getComboMetrics(comboName);
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const { getPricingForModel } = await import("../../src/lib/localDb");
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const quotaPromises = new Map<string, Promise<unknown>>();
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let historicalLatencyStats: Record<string, HistoricalLatencyStatsEntry> = {};
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try {
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const { getModelLatencyStats } = await import("../../src/lib/usageDb");
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historicalLatencyStats = await getModelLatencyStats({
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windowHours: 24,
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minSamples: 3,
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maxRows: 10000,
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});
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} catch {
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// keep empty stats — auto-combo will use runtime + bootstrap signals
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}
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const uniqueProviders = Array.from(
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new Set(
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targets.map((target) => target.provider || parseModel(target.modelStr).provider || "unknown")
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)
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);
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const connectionPoolCounts = new Map<string, number>();
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const connectionsByProvider = new Map<string, Array<Record<string, unknown>>>();
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await Promise.all(
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uniqueProviders.map(async (provider) => {
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try {
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const connections = await getProviderConnections({ provider, isActive: true });
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const active = Array.isArray(connections) ? connections : [];
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connectionPoolCounts.set(provider, active.length);
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connectionsByProvider.set(provider, active);
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} catch {
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connectionPoolCounts.set(provider, 0);
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connectionsByProvider.set(provider, []);
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}
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})
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);
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const expandedTargets: ResolvedComboTarget[] = [];
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for (const target of targets) {
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const provider = target.provider || parseModel(target.modelStr).provider || "unknown";
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const providerConnections = connectionsByProvider.get(provider) || [];
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if (target.connectionId) {
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expandedTargets.push(target);
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continue;
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}
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const connectionIds = providerConnections
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.map((c) => (c && typeof c === "object" && typeof c.id === "string" ? c.id : null))
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.filter((id): id is string => id !== null);
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if (connectionIds.length === 0) {
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expandedTargets.push(target);
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continue;
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}
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for (const connectionId of connectionIds) {
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expandedTargets.push({
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...target,
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connectionId,
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executionKey: `${target.executionKey}@${connectionId}`,
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});
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}
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}
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const candidates = await Promise.all(
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expandedTargets.map(async (target) => {
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const modelStr = target.modelStr;
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const parsed = parseModel(modelStr);
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const provider = target.provider || parsed.provider || parsed.providerAlias || "unknown";
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const model = parsed.model || modelStr;
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const historicalKey = `${provider}/${model}`;
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const historicalModelMetric = historicalLatencyStats[historicalKey] || null;
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const historicalTotal = Number(historicalModelMetric?.totalRequests);
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const hasHistoricalSignal =
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Number.isFinite(historicalTotal) && historicalTotal >= MIN_HISTORY_SAMPLES;
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let costPer1MTokens = 1;
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try {
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const pricing = await getPricingForModel(provider, model);
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const inputPrice = Number(pricing?.input);
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const outputPrice = Number(pricing?.output);
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if (Number.isFinite(inputPrice) && inputPrice >= 0) {
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if (Number.isFinite(outputPrice) && outputPrice >= 0) {
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costPer1MTokens =
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inputPrice * (1 - OUTPUT_TOKEN_RATIO) + outputPrice * OUTPUT_TOKEN_RATIO;
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} else {
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costPer1MTokens = inputPrice;
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}
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}
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} catch {
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// keep default cost
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}
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const modelMetric = metrics?.byModel?.[modelStr] || null;
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const avgLatency = Number(modelMetric?.avgLatencyMs);
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const successRate = Number(modelMetric?.successRate);
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const historicalP95Latency = Number(historicalModelMetric?.p95LatencyMs);
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const historicalStdDev = Number(historicalModelMetric?.latencyStdDev);
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const historicalSuccessRate = Number(historicalModelMetric?.successRate); // 0..1
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const p95LatencyMs = hasHistoricalSignal
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? Number.isFinite(historicalP95Latency) && historicalP95Latency > 0
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? historicalP95Latency
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: getBootstrapLatencyMs(model)
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: Number.isFinite(avgLatency) && avgLatency > 0
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? avgLatency
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: getBootstrapLatencyMs(model);
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const errorRate = hasHistoricalSignal
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? Number.isFinite(historicalSuccessRate) &&
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historicalSuccessRate >= 0 &&
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historicalSuccessRate <= 1
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? 1 - historicalSuccessRate
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: 0.05
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: Number.isFinite(successRate) && successRate >= 0 && successRate <= 100
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? 1 - successRate / 100
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: 0.05;
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const latencyStdDev =
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hasHistoricalSignal && Number.isFinite(historicalStdDev) && historicalStdDev > 0
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? Math.max(10, historicalStdDev)
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: Math.max(10, p95LatencyMs * 0.1);
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const breakerStateRaw = getCircuitBreaker(provider)?.getStatus?.()?.state;
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const circuitBreakerState: ProviderCandidate["circuitBreakerState"] =
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breakerStateRaw === "OPEN" || breakerStateRaw === "HALF_OPEN" ? breakerStateRaw : "CLOSED";
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const contextAffinity = calculateTargetContextAffinity(target, sessionId);
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let resetWindowAffinity = 0.5;
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const fetcher = getQuotaFetcher(provider);
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if (fetcher && target.connectionId) {
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const quotaKey = `${provider}:${target.connectionId}`;
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if (!quotaPromises.has(quotaKey)) {
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quotaPromises.set(
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quotaKey,
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fetchResetAwareQuotaWithCache({
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provider,
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connectionId: target.connectionId,
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fetcher,
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config: resetWindowConfig,
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log: {},
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comboName,
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})
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);
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}
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const quota = await quotaPromises.get(quotaKey)!;
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resetWindowAffinity = calculateResetWindowAffinity(quota, resetWindowConfig);
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}
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return {
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stepId: target.stepId,
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executionKey: target.executionKey,
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modelStr,
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provider,
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model,
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quotaRemaining: 100,
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quotaTotal: 100,
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circuitBreakerState,
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costPer1MTokens,
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p95LatencyMs,
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latencyStdDev,
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errorRate,
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accountTier: "standard" as const,
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quotaResetIntervalSecs: 86400,
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contextAffinity,
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resetWindowAffinity,
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connectionPoolSize: connectionPoolCounts.get(provider) ?? 1,
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connectionId: target.connectionId ?? undefined,
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};
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})
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);
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return candidates;
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}
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|
|
/**
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* Handle combo chat with fallback.
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* @param {Object} options
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* @param {Object} options.body - Request body
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* @param {Object} options.combo - Full combo object { name, models, strategy, config }
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* @param {Function} options.handleSingleModel - Function: (body, modelStr) => Promise<Response>
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* @param {Function} [options.isModelAvailable] - Optional pre-check: (modelStr) => Promise<boolean>
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* @param {Object} options.log - Logger object
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* @returns {Promise<Response>}
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*/
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/** @param {object} options */
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export async function handleComboChat({
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body,
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combo,
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handleSingleModel,
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isModelAvailable,
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log,
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settings,
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allCombos,
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relayOptions,
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signal,
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apiKeyAllowedConnections = null,
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}: HandleComboChatOptions): Promise<Response> {
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const strategy = normalizeRoutingStrategy(combo.strategy || "priority");
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const relayConfig =
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strategy === "context-relay" ? resolveContextRelayConfig(relayOptions?.config || null) : null;
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|
|
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const resilienceSettings: ResilienceSettings = settings
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? resolveResilienceSettings(settings)
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|
: resolveResilienceSettings(null);
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|
|
const universalHandoffConfig = resolveUniversalHandoffConfig(
|
|
(combo.universal_handoff || combo.universalHandoff) as
|
|
| Record<string, unknown>
|
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| null
|
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| undefined,
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relayOptions?.universalHandoffConfig as Record<string, unknown> | null | undefined
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|
);
|
|
// ── Server-side context cache pinning (replaces <omniModel> tag roundtrip) ─
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|
// Uses session_model_history — no client-side tag injection, no visible output pollution.
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|
//
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|
// #3825: when the client sends no session id (most OpenAI-compatible clients), fall
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|
// back to a stable conversation fingerprint derived from the body so the combo still
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|
// re-pins to the same model across turns. ONLY engaged when context_cache_protection
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|
// is truthy — when the toggle is off, behavior is unchanged (combos rotate as before,
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|
// no pin read/write, no <omniModel> tag).
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|
const effectiveSessionId: string | null = combo.context_cache_protection
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? (relayOptions?.sessionId ?? deriveComboSessionKey(body))
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: null;
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let pinnedModel: string | null = null;
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|
if (
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combo.context_cache_protection &&
|
|
effectiveSessionId &&
|
|
!(body as Record<string, unknown>)?.[SKIP_UNIVERSAL_HANDOFF_FLAG]
|
|
) {
|
|
const pinned = getLastSessionModel(effectiveSessionId, combo.name);
|
|
if (pinned) {
|
|
body = { ...body, model: pinned };
|
|
pinnedModel = pinned;
|
|
log.info("COMBO", `[#401] Context cache: pinned model=${pinned} (server-side)`);
|
|
}
|
|
}
|
|
|
|
// ── Combo Agent Middleware (#399 + #401) ────────────────────────────────
|
|
// Apply system_message override, tool_filter_regex.
|
|
// Context cache pinning is handled above via session_model_history.
|
|
const { body: agentBody } = applyComboAgentMiddleware(
|
|
body,
|
|
combo,
|
|
"" // provider/model not yet known — resolved per-model in loop
|
|
);
|
|
body = agentBody;
|
|
const clientRequestedStream = body?.stream === true;
|
|
// Context cache pinning is handled above via server-side session_model_history.
|
|
// No tag injection on response — use handleSingleModel directly.
|
|
// ─────────────────────────────────────────────────────────────────────────
|
|
|
|
// Use config cascade before dispatch so all strategies, pinned context routes,
|
|
// and round-robin targets share the same timeout policy.
|
|
const config = settings
|
|
? resolveComboConfig(combo, settings)
|
|
: { ...getDefaultComboConfig(), ...(combo.config || {}) };
|
|
const comboTargetTimeoutMs = resolveComboTargetTimeoutMs(config, FETCH_TIMEOUT_MS);
|
|
const reasoningTokenBufferEnabled = config.reasoningTokenBufferEnabled !== false;
|
|
|
|
// ── Per-model timeout wrapper ────────────────────────────────────────────
|
|
// Combo target timeouts inherit FETCH_TIMEOUT_MS by default. Operators can
|
|
// configure targetTimeoutMs to shorten fallback latency, but never to extend
|
|
// beyond the current upstream request timeout.
|
|
//
|
|
// The timeoutController is forwarded to the inner caller via target.modelAbortSignal.
|
|
// When the timeout fires we (a) resolve the race with a synthetic 524 and
|
|
// (b) abort the inner request so its upstream fetch is cancelled and downstream
|
|
// cooldown/breaker/usage mutations stop — preventing "ghost" state mutations
|
|
// that diverge from the routing decision the operator sees.
|
|
const handleSingleModelWithTimeout = async (
|
|
b: Record<string, unknown>,
|
|
modelStr: string,
|
|
target?: SingleModelTarget
|
|
): Promise<Response> => {
|
|
if (comboTargetTimeoutMs <= 0) {
|
|
return handleSingleModel(b, modelStr, target).catch((err) =>
|
|
errorResponse(502, err?.message ?? "Upstream model error")
|
|
);
|
|
}
|
|
|
|
const timeoutController = new AbortController();
|
|
let timeoutId: ReturnType<typeof setTimeout> | undefined;
|
|
let timedOut = false;
|
|
const timeoutPromise = new Promise<Response>((resolve) => {
|
|
timeoutId = setTimeout(() => {
|
|
timedOut = true;
|
|
log.warn(
|
|
"COMBO",
|
|
`Model ${modelStr} exceeded ${comboTargetTimeoutMs}ms timeout — falling back`
|
|
);
|
|
// Abort the inner request so its upstream fetch is cancelled and
|
|
// downstream cooldown/breaker/usage mutations don't continue mutating
|
|
// state behind the routing decision's back.
|
|
timeoutController.abort(new Error("combo-per-model-timeout"));
|
|
resolve(
|
|
new Response(JSON.stringify({ error: { message: `Model ${modelStr} timed out` } }), {
|
|
status: 524,
|
|
headers: { "Content-Type": "application/json" },
|
|
})
|
|
);
|
|
}, comboTargetTimeoutMs);
|
|
});
|
|
const targetWithSignal = {
|
|
...(target ?? {}),
|
|
modelAbortSignal: timeoutController.signal,
|
|
};
|
|
const parentHedgeSignal = target?.modelAbortSignal ?? null;
|
|
let onParentHedgeAbort: (() => void) | null = null;
|
|
if (parentHedgeSignal) {
|
|
if (parentHedgeSignal.aborted) {
|
|
timeoutController.abort(new Error("hedge-cancelled"));
|
|
} else {
|
|
onParentHedgeAbort = () => {
|
|
timeoutController.abort(new Error("hedge-cancelled"));
|
|
};
|
|
parentHedgeSignal.addEventListener("abort", onParentHedgeAbort, { once: true });
|
|
}
|
|
}
|
|
try {
|
|
return await Promise.race([
|
|
handleSingleModel(b, modelStr, targetWithSignal).catch((err) => {
|
|
if (timedOut) {
|
|
// Inner call rejected because we aborted it. The synthetic 524 from
|
|
// timeoutPromise already wins the race; return an empty response so
|
|
// the loser branch resolves cleanly without leaking err.message.
|
|
return new Response(null, { status: 599 });
|
|
}
|
|
return errorResponse(502, err?.message ?? "Upstream model error");
|
|
}),
|
|
timeoutPromise,
|
|
]);
|
|
} finally {
|
|
clearTimeout(timeoutId);
|
|
// Detach our listener from the SHARED parent hedge signal. Without this, every target
|
|
// attempt left a listener on the long-lived parent signal for the whole request, so a
|
|
// request that tries many combo targets accumulated listeners on one signal.
|
|
if (parentHedgeSignal && onParentHedgeAbort) {
|
|
parentHedgeSignal.removeEventListener("abort", onParentHedgeAbort);
|
|
}
|
|
}
|
|
};
|
|
|
|
// Route to pinned model if context caching specifies one (Fix #679)
|
|
if (pinnedModel) {
|
|
log.info(
|
|
"COMBO",
|
|
`Bypassing strategy — routing directly to pinned context model: ${pinnedModel}`
|
|
);
|
|
return handleSingleModelWithTimeout(body, pinnedModel);
|
|
}
|
|
|
|
// Route to round-robin handler if strategy matches
|
|
if (strategy === "round-robin") {
|
|
return handleRoundRobinCombo({
|
|
body,
|
|
combo,
|
|
handleSingleModel: handleSingleModelWithTimeout,
|
|
isModelAvailable,
|
|
log,
|
|
settings,
|
|
allCombos,
|
|
signal,
|
|
});
|
|
}
|
|
|
|
const maxRetries = config.maxRetries ?? 1;
|
|
const retryDelayMs = resolveDelayMs(config.retryDelayMs, 2000);
|
|
const fallbackDelayMs = resolveDelayMs(config.fallbackDelayMs, 0);
|
|
const maxSetRetries = config.maxSetRetries ?? 0;
|
|
const setRetryDelayMs = resolveDelayMs(config.setRetryDelayMs, 2000);
|
|
|
|
let orderedTargets =
|
|
strategy === "weighted"
|
|
? resolveWeightedTargets(combo, allCombos)?.orderedTargets || []
|
|
: resolveComboTargets(combo, allCombos, clampComboDepth(config.maxComboDepth));
|
|
|
|
orderedTargets = await applyRequestTagRouting(orderedTargets, body, log);
|
|
|
|
if (strategy === "weighted") {
|
|
log.info(
|
|
"COMBO",
|
|
`Weighted selection${allCombos ? " with nested resolution" : ""}: ${orderedTargets.length} total targets`
|
|
);
|
|
} else if (allCombos) {
|
|
log.info("COMBO", `${strategy} with nested resolution: ${orderedTargets.length} total targets`);
|
|
}
|
|
|
|
// Pipeline dispatch: route smart/pipeline-enabled combos through the multi-stage pipeline
|
|
if (strategy === "auto") {
|
|
const autoParsed = parseAutoPrefix(combo.name);
|
|
const autoVariant = autoParsed.valid ? autoParsed.variant : undefined;
|
|
if (autoVariant === "smart" || config.pipeline_enabled) {
|
|
try {
|
|
const pipelineRaw = await handlePipelineCombo({
|
|
body,
|
|
combo,
|
|
handleChatCore: handleSingleModelWithTimeout,
|
|
log: {
|
|
info: log.info,
|
|
warn: log.warn,
|
|
error: log.error ?? log.warn,
|
|
},
|
|
settings: settings ?? {},
|
|
signal: signal ?? undefined,
|
|
});
|
|
// handlePipelineCombo resolves to a PipelineResult (buffered text) or,
|
|
// in the streaming-final-stage case, a Response. Callers downstream
|
|
// (chat.ts → withSessionHeader) require a Response, so adapt the
|
|
// PipelineResult here instead of leaking the raw object.
|
|
return pipelineRaw instanceof Response
|
|
? pipelineRaw
|
|
: buildPipelineResponse(pipelineRaw, body);
|
|
} catch (pipelineErr) {
|
|
const pipelineMsg = pipelineErr instanceof Error ? pipelineErr.message : "";
|
|
if (pipelineMsg === "PIPELINE_DISABLED") {
|
|
log.info("COMBO", "Pipeline disabled, falling through to standard auto routing");
|
|
} else if (pipelineMsg === "PIPELINE_TOKEN_THRESHOLD") {
|
|
log.info(
|
|
"COMBO",
|
|
"Pipeline skipped (prompt below token threshold), falling through to standard auto routing"
|
|
);
|
|
} else {
|
|
log.warn("COMBO", "Pipeline dispatch failed, falling through to standard auto routing", {
|
|
err: pipelineErr,
|
|
});
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if (strategy === "auto") {
|
|
const requestHasTools = Array.isArray(body?.tools) && body.tools.length > 0;
|
|
let eligibleTargets = [...orderedTargets];
|
|
|
|
if (requestHasTools) {
|
|
const filtered = eligibleTargets.filter((target) => supportsToolCalling(target.modelStr));
|
|
if (filtered.length > 0) {
|
|
eligibleTargets = filtered;
|
|
} else {
|
|
log.warn(
|
|
"COMBO",
|
|
"Auto strategy: all candidates filtered by tool-calling policy, falling back to full pool"
|
|
);
|
|
}
|
|
}
|
|
|
|
// Context-window pre-filter (#1808)
|
|
// Estimate input tokens once; exclude candidates whose known context limit is too small.
|
|
// Uses the same 4-chars-per-token heuristic as contextManager.ts::compressContext().
|
|
// Null/unknown limits are treated as "include" to avoid incorrectly dropping valid targets.
|
|
const requestMessages = body.messages;
|
|
const estimatedInputTokens = estimateTokens(
|
|
typeof requestMessages === "string" ||
|
|
(requestMessages !== null && typeof requestMessages === "object")
|
|
? requestMessages
|
|
: []
|
|
);
|
|
if (estimatedInputTokens > 0) {
|
|
const filteredByContext = eligibleTargets.filter((target) => {
|
|
const limit = getModelContextLimitForModelString(target.modelStr);
|
|
if (limit === null || limit === undefined) return true; // unknown — include to be safe
|
|
return limit >= estimatedInputTokens;
|
|
});
|
|
if (filteredByContext.length > 0) {
|
|
log.debug?.(
|
|
"COMBO",
|
|
`Auto strategy: context-window filter kept ${filteredByContext.length}/${eligibleTargets.length} candidates (est. ${estimatedInputTokens} tokens)`
|
|
);
|
|
eligibleTargets = filteredByContext;
|
|
} else {
|
|
log.warn(
|
|
"COMBO",
|
|
`Auto strategy: all candidates filtered by context-window policy (est. ${estimatedInputTokens} tokens), falling back to full pool`
|
|
);
|
|
// eligibleTargets intentionally unchanged — same fallback contract as tool-calling filter
|
|
}
|
|
|
|
eligibleTargets = await expandAutoComboCandidatePool(eligibleTargets, combo);
|
|
}
|
|
|
|
const prompt = extractPromptForIntent(body);
|
|
const systemPrompt =
|
|
typeof combo?.system_message === "string" ? combo.system_message : undefined;
|
|
const intentConfig = getIntentConfig(settings, combo);
|
|
const intent = classifyWithConfig(prompt, intentConfig, systemPrompt);
|
|
recordComboIntent(combo.name, intent);
|
|
const taskType = mapIntentToTaskType(intent);
|
|
|
|
const rawAutoConfigSource =
|
|
combo?.autoConfig ||
|
|
(isRecord(combo?.config?.auto) ? combo.config.auto : null) ||
|
|
combo?.config ||
|
|
{};
|
|
const autoConfigSource: Record<string, unknown> = isRecord(rawAutoConfigSource)
|
|
? rawAutoConfigSource
|
|
: {};
|
|
const routingStrategy =
|
|
typeof autoConfigSource.routerStrategy === "string"
|
|
? autoConfigSource.routerStrategy
|
|
: typeof autoConfigSource.routingStrategy === "string"
|
|
? autoConfigSource.routingStrategy
|
|
: typeof autoConfigSource.strategyName === "string"
|
|
? autoConfigSource.strategyName
|
|
: "rules";
|
|
|
|
const candidatePool = Array.isArray(autoConfigSource.candidatePool)
|
|
? autoConfigSource.candidatePool
|
|
: [...new Set(eligibleTargets.map((target) => target.provider))];
|
|
|
|
const weights =
|
|
autoConfigSource.weights && typeof autoConfigSource.weights === "object"
|
|
? (autoConfigSource.weights as ScoringWeights)
|
|
: DEFAULT_WEIGHTS;
|
|
const explorationRate = Number.isFinite(Number(autoConfigSource.explorationRate))
|
|
? Number(autoConfigSource.explorationRate)
|
|
: 0.05;
|
|
const budgetCap = Number.isFinite(Number(autoConfigSource.budgetCap))
|
|
? Number(autoConfigSource.budgetCap)
|
|
: undefined;
|
|
const modePack =
|
|
typeof autoConfigSource.modePack === "string" ? autoConfigSource.modePack : undefined;
|
|
const resetWindowConfig = resolveResetWindowConfig(autoConfigSource);
|
|
const slaPolicy = resolveSlaRoutingPolicy(autoConfigSource);
|
|
|
|
let lastKnownGoodProvider: string | undefined;
|
|
try {
|
|
const { getLKGP } = await import("../../src/lib/localDb");
|
|
const lkgp = await getLKGP(combo.name, combo.id || combo.name);
|
|
if (lkgp) lastKnownGoodProvider = lkgp.provider;
|
|
} catch (err) {
|
|
log.warn("COMBO", "Failed to retrieve Last Known Good Provider. This is non-fatal.", { err });
|
|
}
|
|
|
|
const candidates = await buildAutoCandidates(
|
|
eligibleTargets,
|
|
combo.name,
|
|
relayOptions?.sessionId,
|
|
resetWindowConfig
|
|
);
|
|
// G2: Register candidates so chatCore can mark quotaSoftPenalty via setCandidateQuotaSoftPenalty.
|
|
_registerExecutionCandidates(candidates);
|
|
if (candidates.length > 0) {
|
|
let selectedProvider: string | null = null;
|
|
let selectedModel: string | null = null;
|
|
let selectionReason = "";
|
|
|
|
if (routingStrategy !== "rules") {
|
|
try {
|
|
const decision = selectWithStrategy(
|
|
candidates,
|
|
{
|
|
taskType,
|
|
requestHasTools,
|
|
lastKnownGoodProvider,
|
|
estimatedInputTokens,
|
|
sla: slaPolicy,
|
|
},
|
|
routingStrategy
|
|
);
|
|
selectedProvider = decision.provider;
|
|
selectedModel = decision.model;
|
|
selectionReason = decision.reason;
|
|
} catch (err) {
|
|
log.warn(
|
|
"COMBO",
|
|
`Auto strategy '${routingStrategy}' failed (${err?.message || "unknown"}), falling back to rules`
|
|
);
|
|
}
|
|
}
|
|
|
|
if (!selectedProvider || !selectedModel) {
|
|
const selection = selectAutoProvider(
|
|
{
|
|
id: combo.id || combo.name,
|
|
name: combo.name,
|
|
type: "auto",
|
|
candidatePool,
|
|
weights,
|
|
modePack,
|
|
budgetCap,
|
|
explorationRate,
|
|
},
|
|
candidates,
|
|
taskType
|
|
);
|
|
selectedProvider = selection.provider;
|
|
selectedModel = selection.model;
|
|
selectionReason = `score=${selection.score.toFixed(3)}${selection.isExploration ? " (exploration)" : ""}`;
|
|
}
|
|
|
|
// Complexity-aware routing (2026, opt-in): classify the request's
|
|
// difficulty and feed a tier hint into scoring so tierAffinity /
|
|
// specificityMatch favor candidates whose tier matches the request.
|
|
const autoManifestHint: RoutingHint | null =
|
|
config.complexityAwareRouting === true
|
|
? buildComplexityRoutingHint(
|
|
eligibleTargets.filter((t) => t.kind === "model"),
|
|
body,
|
|
log
|
|
)
|
|
: null;
|
|
|
|
const scoredTargets = scoreAutoTargets(
|
|
eligibleTargets,
|
|
candidates,
|
|
taskType,
|
|
weights,
|
|
autoManifestHint
|
|
);
|
|
const rankedTargets = scoredTargets.map((entry) => entry.target);
|
|
const selectedTarget =
|
|
scoredTargets.find((entry) => {
|
|
const parsed = parseModel(entry.target.modelStr);
|
|
const modelId = parsed.model || entry.target.modelStr;
|
|
return entry.target.provider === selectedProvider && modelId === selectedModel;
|
|
})?.target ||
|
|
rankedTargets[0] ||
|
|
eligibleTargets[0];
|
|
|
|
orderedTargets = dedupeTargetsByExecutionKey(
|
|
[selectedTarget, ...rankedTargets, ...eligibleTargets].filter(
|
|
(entry): entry is ResolvedComboTarget => entry !== undefined && entry !== null
|
|
)
|
|
);
|
|
|
|
log.info(
|
|
"COMBO",
|
|
`Auto selection: ${selectedTarget?.modelStr || `${selectedProvider}/${selectedModel}`} | intent=${intent} task=${taskType} | strategy=${routingStrategy} | ${selectionReason}`
|
|
);
|
|
} else {
|
|
log.warn("COMBO", "Auto strategy has no candidates, keeping default ordering");
|
|
}
|
|
} else if (strategy === "lkgp") {
|
|
try {
|
|
const { getLKGP } = await import("../../src/lib/localDb");
|
|
const lkgpProvider = await getLKGP(combo.name, combo.id || combo.name);
|
|
|
|
if (lkgpProvider) {
|
|
const lkgpRecord = lkgpProvider;
|
|
const providerName = lkgpRecord.provider;
|
|
const connId = lkgpRecord.connectionId;
|
|
|
|
let lkgpIndex = -1;
|
|
if (connId) {
|
|
lkgpIndex = orderedTargets.findIndex(
|
|
(target) => target.provider === providerName && target.connectionId === connId
|
|
);
|
|
}
|
|
if (lkgpIndex < 0) {
|
|
lkgpIndex = orderedTargets.findIndex(
|
|
(target) =>
|
|
target.provider === providerName ||
|
|
// Issue #2359: Defensive guard. The `target.modelStr` type
|
|
// annotation is `string`, but malformed combo entries (e.g.,
|
|
// local-provider rows whose `modelStr` failed to resolve when
|
|
// the executor catalogue was being rebuilt) have leaked
|
|
// through and surfaced as `e.startsWith is not a function`
|
|
// 500s on combo test/dispatch. The fast path stays
|
|
// unchanged for the common case; this only avoids the
|
|
// crash when the field is unexpectedly non-string.
|
|
(typeof target.modelStr === "string" &&
|
|
target.modelStr.startsWith(`${providerName}/`))
|
|
);
|
|
}
|
|
|
|
if (lkgpIndex > 0) {
|
|
const [lkgpTarget] = orderedTargets.splice(lkgpIndex, 1);
|
|
orderedTargets.unshift(lkgpTarget);
|
|
log.info(
|
|
"COMBO",
|
|
`[LKGP] Prioritizing last known good provider ${providerName}${connId ? ` (account ${connId})` : ""} for combo "${combo.name}"`
|
|
);
|
|
} else if (lkgpIndex === 0) {
|
|
log.debug?.(
|
|
"COMBO",
|
|
`[LKGP] Last known good provider ${providerName}${connId ? ` (account ${connId})` : ""} already first for combo "${combo.name}"`
|
|
);
|
|
}
|
|
}
|
|
} catch (err) {
|
|
log.warn("COMBO", "Failed to retrieve Last Known Good Provider. This is non-fatal.", { err });
|
|
}
|
|
} else if (strategy === "strict-random") {
|
|
const selectedExecutionKey = await getNextFromDeck(
|
|
`combo:${combo.name}`,
|
|
orderedTargets.map((target) => target.executionKey)
|
|
);
|
|
const selectedTarget =
|
|
orderedTargets.find((target) => target.executionKey === selectedExecutionKey) || null;
|
|
// #3959: shuffle the fallback remainder too. Previously `rest` kept fixed
|
|
// priority order, so after a failing deck pick the chain always fell through
|
|
// to the same top-priority model — a persistently-failing model was retried
|
|
// on essentially every request and fallback load never spread across peers.
|
|
const rest = fisherYatesShuffle(
|
|
orderedTargets.filter((target) => target.executionKey !== selectedExecutionKey)
|
|
);
|
|
orderedTargets = [selectedTarget, ...rest].filter(
|
|
(target): target is ResolvedComboTarget => target !== null
|
|
);
|
|
log.info(
|
|
"COMBO",
|
|
`Strict-random deck: ${selectedExecutionKey} selected (${orderedTargets.length} targets)`
|
|
);
|
|
} else if (strategy === "random") {
|
|
orderedTargets = fisherYatesShuffle([...orderedTargets]);
|
|
log.info("COMBO", `Random shuffle: ${orderedTargets.length} targets`);
|
|
} else if (strategy === "fill-first") {
|
|
log.info(
|
|
"COMBO",
|
|
`Fill-first ordering: preserving priority order (${orderedTargets.length} targets)`
|
|
);
|
|
} else if (strategy === "p2c") {
|
|
orderedTargets = orderTargetsByPowerOfTwoChoices(orderedTargets, combo.name);
|
|
log.info("COMBO", `Power-of-two-choices ordering: selected ${orderedTargets[0]?.modelStr}`);
|
|
} else if (strategy === "least-used") {
|
|
orderedTargets = sortTargetsByUsage(orderedTargets, combo.name);
|
|
log.info("COMBO", `Least-used ordering: ${orderedTargets[0]?.modelStr} has fewest requests`);
|
|
} else if (strategy === "cost-optimized") {
|
|
orderedTargets = await sortTargetsByCost(orderedTargets);
|
|
if (config.manifestRouting === true) {
|
|
try {
|
|
const manifestHint = generateRoutingHints(
|
|
orderedTargets.filter((t) => t.kind === "model"),
|
|
{
|
|
messages: Array.isArray(body?.messages)
|
|
? (body.messages as Array<{ role?: string; content?: string | unknown }>)
|
|
: [],
|
|
tools: Array.isArray(body?.tools)
|
|
? (body.tools as Array<{
|
|
function?: { name: string; description?: string; parameters?: unknown };
|
|
}>)
|
|
: undefined,
|
|
model: typeof body?.model === "string" ? body.model : undefined,
|
|
}
|
|
);
|
|
if (manifestHint.strategyModifier === "require-premium") {
|
|
const eligible = orderedTargets.filter(
|
|
(t) =>
|
|
t.kind !== "model" ||
|
|
manifestHint.eligibleTargets.some(
|
|
(e) => e.provider === t.provider && e.modelStr === t.modelStr
|
|
)
|
|
);
|
|
if (eligible.length > 0) orderedTargets = eligible;
|
|
}
|
|
log.debug?.(
|
|
{
|
|
strategyModifier: manifestHint.strategyModifier,
|
|
specificityLevel: manifestHint.specificityLevel,
|
|
score: manifestHint.specificity.score,
|
|
},
|
|
"manifest routing applied"
|
|
);
|
|
} catch (err) {
|
|
log.warn({ err }, "manifest routing failed, falling back to standard strategy");
|
|
}
|
|
}
|
|
log.info("COMBO", `Cost-optimized ordering: cheapest first (${orderedTargets[0]?.modelStr})`);
|
|
} else if (strategy === "reset-aware") {
|
|
orderedTargets = await orderTargetsByResetAwareQuota(
|
|
orderedTargets,
|
|
combo.name,
|
|
config,
|
|
log,
|
|
apiKeyAllowedConnections
|
|
);
|
|
log.info(
|
|
"COMBO",
|
|
`Reset-aware ordering: ${orderedTargets[0]?.modelStr}${orderedTargets[0]?.connectionId ? ` (${orderedTargets[0].connectionId})` : ""} first`
|
|
);
|
|
} else if (strategy === "reset-window") {
|
|
orderedTargets = await orderTargetsByResetWindow(
|
|
orderedTargets,
|
|
combo.name,
|
|
config,
|
|
log,
|
|
apiKeyAllowedConnections
|
|
);
|
|
log.info(
|
|
"COMBO",
|
|
`Reset-window ordering: ${orderedTargets[0]?.modelStr}${orderedTargets[0]?.connectionId ? ` (${orderedTargets[0].connectionId})` : ""} first`
|
|
);
|
|
} else if (strategy === "context-optimized") {
|
|
orderedTargets = sortTargetsByContextSize(orderedTargets);
|
|
log.info("COMBO", `Context-optimized ordering: largest first (${orderedTargets[0]?.modelStr})`);
|
|
}
|
|
|
|
orderedTargets = orderTargetsByEvalScores(orderedTargets, config.evalRouting, log);
|
|
orderedTargets = filterTargetsByRequestCompatibility(orderedTargets, body, log);
|
|
|
|
// Parallel pre-screen: check provider profiles and model availability for all targets
|
|
// Only runs for priority strategy where sequential checking causes latency
|
|
const preScreenMap =
|
|
strategy === "priority"
|
|
? await preScreenTargets(orderedTargets, isModelAvailable).catch(
|
|
() => new Map<string, PreScreenResult>()
|
|
)
|
|
: new Map<string, PreScreenResult>();
|
|
|
|
if (orderedTargets.length === 0) {
|
|
return comboModelNotFoundResponse("Combo has no executable targets");
|
|
}
|
|
|
|
scheduleShadowRouting(
|
|
combo,
|
|
config,
|
|
body,
|
|
resolveShadowTargets(combo, config, allCombos),
|
|
handleSingleModel,
|
|
isModelAvailable,
|
|
strategy,
|
|
log
|
|
);
|
|
|
|
// G2: Collect execution keys registered by _registerExecutionCandidates above (auto strategy).
|
|
// We snapshot them now so cleanup can happen after the attempt loop finishes.
|
|
const _registeredExecutionKeys = orderedTargets.map((t) => t.executionKey).filter(Boolean);
|
|
|
|
let globalAttempts = 0;
|
|
|
|
try {
|
|
for (let setTry = 0; setTry <= maxSetRetries; setTry++) {
|
|
// #1731: Per-set-iteration set of providers whose quota is fully exhausted.
|
|
// Reset each retry so providers excluded in a previous attempt get another chance.
|
|
const exhaustedProviders = new Set<string>();
|
|
const exhaustedConnections = new Set<string>();
|
|
const transientRateLimitedProviders = new Set<string>();
|
|
if (setTry > 0) {
|
|
log.info("COMBO", `All targets failed — retrying set (${setTry}/${maxSetRetries})`);
|
|
await new Promise((resolve) => {
|
|
const timer = setTimeout(resolve, setRetryDelayMs);
|
|
signal?.addEventListener(
|
|
"abort",
|
|
() => {
|
|
clearTimeout(timer);
|
|
resolve(undefined);
|
|
},
|
|
{ once: true }
|
|
);
|
|
});
|
|
if (signal?.aborted) {
|
|
log.info("COMBO", "Client disconnected during set retry delay — aborting");
|
|
return errorResponse(499, "Client disconnected");
|
|
}
|
|
}
|
|
|
|
let lastError: string | null = null;
|
|
let earliestRetryAfter: ComboRetryAfter | null = null;
|
|
let lastStatus: number | null = null;
|
|
const startTime = Date.now();
|
|
let fallbackCount = 0;
|
|
let recordedAttempts = 0;
|
|
|
|
let globalResolve: ((res: Response) => void) | null = null;
|
|
const globalPromise = new Promise<Response>((res) => {
|
|
globalResolve = res;
|
|
});
|
|
const runningTasks = new Set<Promise<void>>();
|
|
let anySuccess = false;
|
|
const abortControllers = new Map<number, AbortController>();
|
|
const zeroLatencyOptimizationsEnabled = config.zeroLatencyOptimizationsEnabled === true;
|
|
|
|
const executeTarget = async (
|
|
i: number
|
|
): Promise<{ ok: boolean; response?: Response } | null> => {
|
|
const target = orderedTargets[i];
|
|
const modelStr = target.modelStr;
|
|
const rawModel = parseModel(modelStr).model || modelStr;
|
|
const provider = target.provider;
|
|
|
|
const cb = getCircuitBreaker(provider);
|
|
if (cb.getStatus().state === "OPEN") {
|
|
log.info("COMBO", `Skipping ${modelStr} — circuit breaker OPEN for ${provider}`);
|
|
if (i > 0) fallbackCount++;
|
|
return null;
|
|
}
|
|
|
|
if (
|
|
resilienceSettings.providerCooldown.enabled &&
|
|
Boolean(provider && provider !== "unknown") &&
|
|
isProviderInCooldown(provider, target.connectionId ?? undefined, resilienceSettings)
|
|
) {
|
|
log.info("COMBO", `Skipping ${modelStr} — provider ${provider} in global cooldown`);
|
|
if (i > 0) fallbackCount++;
|
|
return null;
|
|
}
|
|
|
|
// Use pre-screened profile if available, otherwise fetch on demand
|
|
const preScreenEntry = preScreenMap.get(target.executionKey);
|
|
const profile = preScreenEntry?.profile ?? (await getRuntimeProviderProfile(provider));
|
|
|
|
const allowRateLimitedConnection =
|
|
Boolean(provider && provider !== "unknown") &&
|
|
transientRateLimitedProviders.has(provider);
|
|
const targetForAttempt = allowRateLimitedConnection
|
|
? {
|
|
...target,
|
|
allowRateLimitedConnection: true,
|
|
modelAbortSignal: abortControllers.get(i)!.signal,
|
|
}
|
|
: { ...target, modelAbortSignal: abortControllers.get(i)!.signal };
|
|
|
|
// #1731v2: Skip targets whose provider:connection pair had a connection-level error.
|
|
if (provider && target.connectionId) {
|
|
const connKey = `${provider}:${target.connectionId}`;
|
|
if (exhaustedConnections.has(connKey)) {
|
|
log.info(
|
|
"COMBO",
|
|
`Skipping ${modelStr} — connection ${target.connectionId} for provider ${provider} had connection error (#1731v2)`
|
|
);
|
|
if (i > 0) fallbackCount++;
|
|
return null;
|
|
}
|
|
}
|
|
// #1731: Skip targets from a provider that already signaled full quota exhaustion this request.
|
|
if (provider && exhaustedProviders.has(provider)) {
|
|
log.info(
|
|
"COMBO",
|
|
`Skipping ${modelStr} — provider ${provider} marked exhausted this request (#1731)`
|
|
);
|
|
if (i > 0) fallbackCount++;
|
|
return null;
|
|
}
|
|
|
|
// Pre-check: skip models locked by the resilience system (model-level lockout)
|
|
if (provider && rawModel && isModelLocked(provider, target.connectionId || "", rawModel)) {
|
|
log.info("COMBO", `Skipping ${modelStr} — model locked by resilience (cooldown active)`);
|
|
if (i > 0) fallbackCount++;
|
|
return null;
|
|
}
|
|
|
|
// Pre-screen may have already determined this target unavailable (e.g.
|
|
// circuit-breaker OPEN at resolve time). Skip immediately in that case.
|
|
// For targets pre-screened as "available" we still call isModelAvailable
|
|
// below because connection cooldowns (rateLimitedUntil) can change
|
|
// mid-request after a same-provider failure — the pre-screen snapshot is
|
|
// stale by the time we reach the 2nd/3rd same-provider target.
|
|
const preCheckedAvailable = preScreenEntry?.available ?? null;
|
|
if (preCheckedAvailable === false) {
|
|
log.info("COMBO", `Skipping ${modelStr} — pre-screen marked unavailable`);
|
|
if (i > 0) fallbackCount++;
|
|
return null;
|
|
}
|
|
if (isModelAvailable) {
|
|
const available = await isModelAvailable(modelStr, targetForAttempt);
|
|
if (!available) {
|
|
log.debug?.(
|
|
"COMBO",
|
|
`Skipping ${modelStr} — no credentials available or model excluded`
|
|
);
|
|
if (i > 0) fallbackCount++;
|
|
return null;
|
|
}
|
|
}
|
|
|
|
// Credential gate: skip targets with known-bad credentials (fail-fast)
|
|
const connectionId = target.connectionId as string | undefined;
|
|
if (connectionId) {
|
|
const gateResult = checkCredentialGate(connectionId, provider, modelStr);
|
|
if (gateResult.allowed === false) {
|
|
logCredentialSkip(log, modelStr, gateResult.reason || "Credential gate blocked");
|
|
if (i > 0) fallbackCount++;
|
|
return null;
|
|
}
|
|
}
|
|
|
|
// Retry loop for transient errors
|
|
for (let retry = 0; retry <= maxRetries; retry++) {
|
|
// Fix #1681: Bail out immediately if the client has disconnected
|
|
if (signal?.aborted) {
|
|
log.info("COMBO", `Client disconnected — aborting combo loop before model ${modelStr}`);
|
|
return { ok: false, response: errorResponse(499, "Client disconnected") };
|
|
}
|
|
globalAttempts++;
|
|
if (globalAttempts > MAX_GLOBAL_ATTEMPTS) {
|
|
log.warn(
|
|
"COMBO",
|
|
`Maximum combo attempts (${MAX_GLOBAL_ATTEMPTS}) exceeded across all targets and fallbacks. Terminating loop to prevent runaway background requests.`
|
|
);
|
|
return { ok: false, response: errorResponse(503, "Maximum combo retry limit reached") };
|
|
}
|
|
|
|
// Predictive TTFT Circuit Breaker (skip slow models)
|
|
if (
|
|
zeroLatencyOptimizationsEnabled &&
|
|
config.predictiveTtftMs &&
|
|
config.predictiveTtftMs > 0 &&
|
|
retry === 0
|
|
) {
|
|
const cMetrics = getComboMetrics(combo.name);
|
|
if (cMetrics) {
|
|
const targetKey = orderedTargets[i].executionKey || modelStr;
|
|
const m = cMetrics.byTarget[targetKey] || cMetrics.byModel[modelStr];
|
|
if (shouldSkipForPredictedTtft(m, config.predictiveTtftMs)) {
|
|
log.warn(
|
|
"COMBO",
|
|
`Predictive TTFT Circuit Breaker: skipping ${modelStr} (avg ${m.avgLatencyMs}ms > max ${config.predictiveTtftMs}ms)`
|
|
);
|
|
return null;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (retry > 0) {
|
|
log.info(
|
|
"COMBO",
|
|
`Retrying ${modelStr} in ${retryDelayMs}ms (attempt ${retry + 1}/${maxRetries + 1})`
|
|
);
|
|
await new Promise((resolve) => {
|
|
const timer = setTimeout(resolve, retryDelayMs);
|
|
signal?.addEventListener(
|
|
"abort",
|
|
() => {
|
|
clearTimeout(timer);
|
|
resolve(undefined);
|
|
},
|
|
{ once: true }
|
|
);
|
|
});
|
|
if (signal?.aborted) {
|
|
log.info("COMBO", `Client disconnected during retry delay — aborting`);
|
|
return { ok: false, response: errorResponse(499, "Client disconnected") };
|
|
}
|
|
}
|
|
|
|
log.info(
|
|
"COMBO",
|
|
`Trying model ${i + 1}/${orderedTargets.length}: ${modelStr}${retry > 0 ? ` (retry ${retry})` : ""}`
|
|
);
|
|
emit("combo.target.attempt", {
|
|
comboName: combo.name,
|
|
targetIndex: i,
|
|
provider,
|
|
model: modelStr,
|
|
timestamp: Date.now(),
|
|
strategy,
|
|
});
|
|
|
|
// Deep clone the body to ensure context preservation and prevent mutations
|
|
// from affecting other targets in the combo
|
|
let attemptBody = JSON.parse(JSON.stringify(body));
|
|
|
|
// Proactive Context Compression for fallbacks (Zero-Latency optimization)
|
|
if (
|
|
zeroLatencyOptimizationsEnabled &&
|
|
i > 0 &&
|
|
config.fallbackCompressionMode &&
|
|
config.fallbackCompressionMode !== "off"
|
|
) {
|
|
const { estimateTokens } = await import("./contextManager.ts");
|
|
const estimatedTokens = estimateTokens(JSON.stringify(attemptBody));
|
|
if (estimatedTokens > (config.fallbackCompressionThreshold ?? 1000)) {
|
|
const { applyCompression } = await import("./compression/strategySelector.ts");
|
|
const compressionResult = applyCompression(
|
|
attemptBody,
|
|
config.fallbackCompressionMode as CompressionMode,
|
|
// Opt into the TV1 bail-out so a throwing fallback engine is SKIPPED rather than
|
|
// propagating out of executeTarget and being swallowed as a "Speculative task
|
|
// error" (which silently drops this combo target). minGainPercent:0 keeps the
|
|
// advance behavior identical to the default path — this only adds skip-on-throw.
|
|
{ model: modelStr, bailout: { enabled: true, minGainPercent: 0 } }
|
|
);
|
|
if (compressionResult.compressed) {
|
|
log.info(
|
|
"COMBO",
|
|
`Proactive fallback compression applied (${config.fallbackCompressionMode}): ${estimatedTokens} -> ${compressionResult.stats?.compressedTokens} tokens`
|
|
);
|
|
attemptBody = compressionResult.body;
|
|
}
|
|
}
|
|
}
|
|
|
|
// Universal handoff: inject existing handoff if model changed
|
|
if (
|
|
universalHandoffConfig.enabled &&
|
|
relayOptions?.sessionId &&
|
|
!(body as Record<string, unknown>)?.[SKIP_UNIVERSAL_HANDOFF_FLAG]
|
|
) {
|
|
const lastModel = getLastSessionModel(relayOptions.sessionId, combo.name);
|
|
if (lastModel && lastModel !== modelStr) {
|
|
const existingHandoff = getHandoff(relayOptions.sessionId, combo.name);
|
|
attemptBody = injectUniversalHandoffBody(
|
|
attemptBody, // Use the cloned body to maintain isolation
|
|
lastModel,
|
|
modelStr,
|
|
`Model routing: ${lastModel} → ${modelStr}`,
|
|
existingHandoff
|
|
);
|
|
}
|
|
}
|
|
|
|
// Issue #3587: Reasoning models can spend the whole output budget on
|
|
// reasoning. Only add headroom when the complete buffer fits inside the
|
|
// model's known output cap; otherwise preserve the client's explicit limit.
|
|
{
|
|
const bodyRecord = attemptBody as Record<string, unknown>;
|
|
const currentMaxTokens = toPositiveInteger(bodyRecord.max_tokens);
|
|
const bufferedMaxTokens = resolveReasoningBufferedMaxTokens(
|
|
modelStr,
|
|
bodyRecord.max_tokens,
|
|
{ enabled: reasoningTokenBufferEnabled }
|
|
);
|
|
if (currentMaxTokens !== null && bufferedMaxTokens !== null) {
|
|
bodyRecord.max_tokens = bufferedMaxTokens;
|
|
if (bufferedMaxTokens !== currentMaxTokens) {
|
|
log.info(
|
|
"COMBO",
|
|
`Reasoning model ${modelStr}: adjusted max_tokens ${currentMaxTokens} -> ${bufferedMaxTokens}`
|
|
);
|
|
}
|
|
}
|
|
}
|
|
const result = await handleSingleModelWithTimeout(attemptBody, modelStr, {
|
|
...targetForAttempt,
|
|
failoverBeforeRetry: config.failoverBeforeRetry,
|
|
});
|
|
|
|
// Success — validate response quality before returning
|
|
if (result.ok) {
|
|
const quality = await validateResponseQuality(result, clientRequestedStream, log);
|
|
if (!quality.valid) {
|
|
log.warn(
|
|
"COMBO",
|
|
`Model ${modelStr} returned 200 but failed quality check: ${quality.reason}`
|
|
);
|
|
recordComboRequest(combo.name, modelStr, {
|
|
success: false,
|
|
latencyMs: Date.now() - startTime,
|
|
fallbackCount,
|
|
strategy,
|
|
target: toRecordedTarget(target),
|
|
});
|
|
recordedAttempts++;
|
|
// Fix #1707: Set terminal state so the fallback doesn't emit
|
|
// misleading ALL_ACCOUNTS_INACTIVE when the real issue is quality.
|
|
lastError = `Upstream response failed quality validation: ${quality.reason}`;
|
|
if (!lastStatus) lastStatus = 502;
|
|
if (i > 0) fallbackCount++;
|
|
if (provider && rawModel) {
|
|
const mlSettings = resolveModelLockoutSettings(settings);
|
|
if (mlSettings.enabled && mlSettings.errorCodes.includes(502)) {
|
|
recordModelLockoutFailure(
|
|
provider,
|
|
target.connectionId || "",
|
|
rawModel,
|
|
"quality_failure",
|
|
502,
|
|
mlSettings.baseCooldownMs,
|
|
profile,
|
|
{
|
|
exactCooldownMs: mlSettings.useExponentialBackoff
|
|
? 0
|
|
: mlSettings.baseCooldownMs,
|
|
}
|
|
);
|
|
}
|
|
}
|
|
emit("combo.target.failed", {
|
|
comboName: combo.name,
|
|
targetIndex: i,
|
|
provider,
|
|
model: modelStr,
|
|
error: `Quality: ${quality.reason}`,
|
|
latencyMs: Date.now() - startTime,
|
|
});
|
|
return null;
|
|
}
|
|
|
|
// Success decay: a healthy response walks the model's lockout failure
|
|
// count back down (and eventually clears an expired lockout entirely).
|
|
if (provider && rawModel) {
|
|
const dcResult = decayModelFailureCount(
|
|
provider,
|
|
target.connectionId || "",
|
|
rawModel
|
|
);
|
|
if (dcResult.cleared) {
|
|
log.info("COMBO", `Model ${modelStr} fully recovered — lockout cleared`);
|
|
} else if (dcResult.newFailureCount > 0) {
|
|
log.debug(
|
|
"COMBO",
|
|
`Model ${modelStr} decayed to failureCount=${dcResult.newFailureCount}`
|
|
);
|
|
}
|
|
}
|
|
|
|
const latencyMs = Date.now() - startTime;
|
|
emit("combo.target.succeeded", {
|
|
comboName: combo.name,
|
|
targetIndex: i,
|
|
provider,
|
|
model: modelStr,
|
|
latencyMs,
|
|
});
|
|
log.info(
|
|
"COMBO",
|
|
`Model ${modelStr} succeeded (${latencyMs}ms, ${fallbackCount} fallbacks)`
|
|
);
|
|
recordComboRequest(combo.name, modelStr, {
|
|
success: true,
|
|
latencyMs,
|
|
fallbackCount,
|
|
strategy,
|
|
target: toRecordedTarget(target),
|
|
});
|
|
recordedAttempts++;
|
|
|
|
// Reset cooldown on success
|
|
if (provider && provider !== "unknown") {
|
|
recordProviderSuccess(provider, target.connectionId ?? undefined);
|
|
}
|
|
// Webhook fan-out: best-effort, never blocks the response stream.
|
|
notifyWebhookEvent("request.completed", {
|
|
combo: combo.name,
|
|
provider,
|
|
model: modelStr,
|
|
latencyMs,
|
|
fallbackCount,
|
|
});
|
|
|
|
// Context cache pinning: record model usage for session-based pinning
|
|
// (independent of universal handoff — always fires when context_cache_protection is on)
|
|
// #3825: write under the SAME effectiveSessionId used by the read site so a
|
|
// sessionless conversation re-pins to this model on its next turn.
|
|
if (
|
|
combo.context_cache_protection &&
|
|
effectiveSessionId &&
|
|
!(body as Record<string, unknown>)?.[SKIP_UNIVERSAL_HANDOFF_FLAG]
|
|
) {
|
|
recordSessionModelUsage(
|
|
effectiveSessionId,
|
|
combo.name,
|
|
modelStr,
|
|
provider,
|
|
target.connectionId ?? undefined
|
|
);
|
|
}
|
|
|
|
// Universal handoff: record model usage for session
|
|
if (
|
|
universalHandoffConfig.enabled &&
|
|
relayOptions?.sessionId &&
|
|
!(body as Record<string, unknown>)?.[SKIP_UNIVERSAL_HANDOFF_FLAG]
|
|
) {
|
|
const prevModel = getLastSessionModel(relayOptions.sessionId, combo.name);
|
|
recordSessionModelUsage(
|
|
relayOptions.sessionId,
|
|
combo.name,
|
|
modelStr,
|
|
provider,
|
|
target.connectionId ?? undefined
|
|
);
|
|
if (prevModel && prevModel !== modelStr) {
|
|
const handoffSourceMessages =
|
|
Array.isArray(body?.messages) && body.messages.length > 0
|
|
? body.messages
|
|
: Array.isArray(body?.input)
|
|
? body.input
|
|
: [];
|
|
|
|
maybeGenerateUniversalHandoff({
|
|
sessionId: relayOptions.sessionId,
|
|
comboName: combo.name,
|
|
messages: handoffSourceMessages as MessageLike[],
|
|
prevModel,
|
|
currModel: modelStr,
|
|
universalConfig: universalHandoffConfig,
|
|
handleSingleModel: handleSingleModelWithTimeout,
|
|
});
|
|
}
|
|
|
|
recordSessionModelUsage(
|
|
relayOptions.sessionId,
|
|
combo.name,
|
|
modelStr,
|
|
provider,
|
|
target.connectionId ?? undefined
|
|
);
|
|
}
|
|
// Context-relay intentionally splits responsibilities:
|
|
// combo.ts decides whether a successful turn should generate a handoff,
|
|
// while chat.ts injects the handoff after the real connectionId is resolved.
|
|
if (
|
|
strategy === "context-relay" &&
|
|
relayOptions?.sessionId &&
|
|
relayConfig &&
|
|
relayConfig.handoffProviders.includes(provider) &&
|
|
provider === "codex"
|
|
) {
|
|
const connectionId = getSessionConnection(relayOptions.sessionId);
|
|
if (connectionId) {
|
|
const quotaInfo = await fetchCodexQuota(connectionId).catch(() => null);
|
|
if (quotaInfo) {
|
|
const resetCandidates = [
|
|
quotaInfo.windows?.session?.resetAt,
|
|
quotaInfo.windows?.weekly?.resetAt,
|
|
quotaInfo.resetAt,
|
|
]
|
|
.filter(
|
|
(value): value is string => typeof value === "string" && value.length > 0
|
|
)
|
|
.sort((a, b) => a.localeCompare(b));
|
|
const handoffSourceMessages =
|
|
Array.isArray(body?.messages) && body.messages.length > 0
|
|
? body.messages
|
|
: Array.isArray(body?.input)
|
|
? body.input
|
|
: [];
|
|
|
|
maybeGenerateHandoff({
|
|
sessionId: relayOptions.sessionId,
|
|
comboName: combo.name,
|
|
connectionId,
|
|
percentUsed: quotaInfo.percentUsed,
|
|
messages: handoffSourceMessages,
|
|
model: modelStr,
|
|
expiresAt: resetCandidates[0] || null,
|
|
config: relayConfig,
|
|
handleSingleModel: handleSingleModelWithTimeout,
|
|
});
|
|
}
|
|
}
|
|
}
|
|
|
|
// Record last known good provider (LKGP) for this combo/model (#919)
|
|
if (provider) {
|
|
const connId = target.connectionId || undefined;
|
|
void (async () => {
|
|
try {
|
|
const { setLKGP } = await import("../../src/lib/localDb");
|
|
await Promise.all([
|
|
setLKGP(combo.name, target.executionKey, provider, connId),
|
|
setLKGP(combo.name, combo.id || combo.name, provider, connId),
|
|
]);
|
|
} catch (err) {
|
|
log.warn(
|
|
"COMBO",
|
|
"Failed to record Last Known Good Provider. This is non-fatal.",
|
|
{
|
|
err,
|
|
}
|
|
);
|
|
}
|
|
})();
|
|
}
|
|
|
|
return { ok: true, response: quality.clonedResponse ?? result };
|
|
}
|
|
|
|
// Extract error info from response
|
|
let errorText = result.statusText || "";
|
|
let errorBody: ComboErrorBody = null;
|
|
let retryAfter: ComboRetryAfter | null = null;
|
|
try {
|
|
const cloned = result.clone();
|
|
try {
|
|
const text = await cloned.text();
|
|
if (text) {
|
|
errorText = text.substring(0, 500);
|
|
errorBody = JSON.parse(text);
|
|
const parsedError = errorBody?.error;
|
|
errorText =
|
|
(typeof parsedError === "object" && parsedError?.message) ||
|
|
(typeof parsedError === "string" ? parsedError : null) ||
|
|
errorBody?.message ||
|
|
errorText;
|
|
retryAfter = errorBody?.retryAfter || null;
|
|
}
|
|
} catch {
|
|
/* Clone parse failed */
|
|
}
|
|
} catch {
|
|
/* Clone failed */
|
|
}
|
|
|
|
// Track earliest retryAfter
|
|
if (
|
|
retryAfter &&
|
|
(!earliestRetryAfter || new Date(retryAfter) < new Date(earliestRetryAfter))
|
|
) {
|
|
earliestRetryAfter = retryAfter;
|
|
}
|
|
|
|
// Normalize error text
|
|
if (typeof errorText !== "string") {
|
|
try {
|
|
errorText = JSON.stringify(errorText);
|
|
} catch {
|
|
errorText = String(errorText);
|
|
}
|
|
}
|
|
|
|
const isStreamReadinessFailure =
|
|
(result.status === 502 || result.status === 504) &&
|
|
isStreamReadinessFailureErrorBody(errorBody);
|
|
|
|
// FIX 5: a local per-API-key token-limit 429 must not cool shared accounts.
|
|
const isTokenLimitBreach =
|
|
result.status === 429 && isTokenLimitBreachErrorBody(errorBody);
|
|
|
|
// Fix #1681: Status 499 means client disconnected — stop combo loop immediately.
|
|
// There is no point trying fallback models when nobody is listening.
|
|
if (result.status === 499) {
|
|
log.info("COMBO", `Client disconnected (499) during ${modelStr} — stopping combo loop`);
|
|
recordComboRequest(combo.name, modelStr, {
|
|
success: false,
|
|
latencyMs: Date.now() - startTime,
|
|
fallbackCount,
|
|
strategy,
|
|
target: toRecordedTarget(target),
|
|
});
|
|
recordedAttempts++;
|
|
// executeTarget must return the {ok,response} contract — a raw Response
|
|
// here makes the speculative loop's res.ok/res.response checks both miss,
|
|
// so the combo would wrongly fall through to the next model after a 499.
|
|
return { ok: false, response: result };
|
|
}
|
|
|
|
// Combo fallback is target-level orchestration: a non-ok target response is
|
|
// treated as local to that target and the combo continues to the next target.
|
|
// Error classification is retained only for retry/cooldown pacing; it must
|
|
// not decide whether fallback happens, including for generic 400 responses.
|
|
const rawError = errorBody?.error;
|
|
const structuredError =
|
|
rawError && typeof rawError === "object"
|
|
? {
|
|
// Upstream JSON may carry a numeric `code`/`type` (e.g. {"code":40001}).
|
|
// Coerce to string if present instead of discarding, so downstream string
|
|
// ops (.toLowerCase, .startsWith) can run safely without type crashes.
|
|
code:
|
|
(rawError as Record<string, unknown>).code !== undefined &&
|
|
(rawError as Record<string, unknown>).code !== null
|
|
? String((rawError as Record<string, unknown>).code)
|
|
: undefined,
|
|
type:
|
|
(rawError as Record<string, unknown>).type !== undefined &&
|
|
(rawError as Record<string, unknown>).type !== null
|
|
? String((rawError as Record<string, unknown>).type)
|
|
: undefined,
|
|
}
|
|
: undefined;
|
|
const fallbackResult = checkFallbackError(
|
|
result.status,
|
|
errorText,
|
|
0,
|
|
null,
|
|
provider,
|
|
result.headers,
|
|
profile,
|
|
structuredError
|
|
);
|
|
const { cooldownMs } = fallbackResult;
|
|
|
|
// #1731: If the entire provider quota is exhausted, mark it so subsequent
|
|
// same-provider targets are skipped immediately. API-key 429s still use
|
|
// the short resilience cooldown, but explicit quota text should stop the
|
|
// combo from trying another target for the same provider in this request.
|
|
// Passthrough/per-model-quota providers multiplex independent upstream
|
|
// models behind one provider connection; a quota 429 for one model must
|
|
// not skip fallback targets for another model on the same provider.
|
|
const providerExhausted =
|
|
Boolean(provider && provider !== "unknown") &&
|
|
!hasPerModelQuota(provider, rawModel) &&
|
|
(isProviderExhaustedReason(fallbackResult) ||
|
|
classifyErrorText(errorText) === RateLimitReason.QUOTA_EXHAUSTED);
|
|
if (providerExhausted) {
|
|
exhaustedProviders.add(provider);
|
|
log.info(
|
|
"COMBO",
|
|
`Provider ${provider} quota exhausted — marking for skip on remaining targets (#1731)`
|
|
);
|
|
} else if (
|
|
result.status === 429 &&
|
|
!isTokenLimitBreach &&
|
|
provider &&
|
|
provider !== "unknown"
|
|
) {
|
|
transientRateLimitedProviders.add(provider);
|
|
}
|
|
// #1731: Connection-level errors (502/503/504) suggest the provider itself is having
|
|
// issues (e.g. upstream unreachable, proxy error). Skip remaining same-provider
|
|
// targets in this request to avoid hammering a known-bad connection.
|
|
if (
|
|
!providerExhausted &&
|
|
provider &&
|
|
provider !== "unknown" &&
|
|
[408, 500, 502, 503, 504, 524].includes(result.status) &&
|
|
!isProviderCircuitOpenResult(result, errorText)
|
|
) {
|
|
const connId = target.connectionId as string | undefined;
|
|
if (connId) {
|
|
exhaustedConnections.add(`${provider}:${connId}`);
|
|
log.info(
|
|
"COMBO",
|
|
`Provider ${provider} connection ${connId} error (${result.status}) — marking for skip on remaining targets (#1731v2)`
|
|
);
|
|
} else {
|
|
exhaustedProviders.add(provider);
|
|
log.info(
|
|
"COMBO",
|
|
`Provider ${provider} connection error (${result.status}) — marking for skip on remaining targets (#1731)`
|
|
);
|
|
}
|
|
}
|
|
|
|
// #2101: Prevent infinite fallback loops with 400 Bad Request errors that indicate
|
|
// request-body-specific issues (context overflow, malformed request, model access denied).
|
|
// These errors are unlikely to be resolved by trying different target models since
|
|
// the same problematic request body would be sent to all targets.
|
|
if (
|
|
result.status === 400 &&
|
|
fallbackResult.shouldFallback &&
|
|
(fallbackResult.reason === RateLimitReason.MODEL_CAPACITY ||
|
|
errorText.toLowerCase().includes("context") ||
|
|
errorText.toLowerCase().includes("prompt") ||
|
|
errorText.toLowerCase().includes("token") ||
|
|
errorText.toLowerCase().includes("malformed") ||
|
|
errorText.toLowerCase().includes("invalid") ||
|
|
errorText.toLowerCase().includes("bad request"))
|
|
) {
|
|
log.warn(
|
|
"COMBO",
|
|
`400 Bad Request with body-specific error detected on ${modelStr} — skipping fallback to other targets to prevent infinite loop`
|
|
);
|
|
// Record the failure and break to avoid trying other targets with the same bad request
|
|
recordComboRequest(combo.name, modelStr, {
|
|
success: false,
|
|
latencyMs: Date.now() - startTime,
|
|
fallbackCount,
|
|
strategy,
|
|
target: toRecordedTarget(target),
|
|
});
|
|
recordedAttempts++;
|
|
lastError = errorText || String(result.status);
|
|
if (!lastStatus) lastStatus = result.status;
|
|
if (i > 0) fallbackCount++;
|
|
log.warn("COMBO", `Model ${modelStr} failed with body-specific error, stopping combo`);
|
|
break; // Break out of the target loop to avoid trying other models
|
|
}
|
|
|
|
// Trigger shared provider circuit breaker for 5xx errors and connection failures.
|
|
// If the next target in the combo is on the same provider, don't mark the provider
|
|
// as failed — different models on the same provider may still succeed.
|
|
// G-02: when fallbackResult.skipProviderBreaker is set (embedded service supervisor
|
|
// outage signalled via X-Omni-Fallback-Hint: connection_cooldown) apply connection
|
|
// cooldown only — do NOT trip the whole-provider breaker.
|
|
const nextTarget = orderedTargets[i + 1];
|
|
const sameProviderNext =
|
|
typeof nextTarget?.provider === "string" && nextTarget.provider === provider;
|
|
if (
|
|
shouldRecordProviderBreakerFailure({
|
|
isStreamReadinessFailure,
|
|
status: result.status,
|
|
sameProviderNext,
|
|
skipProviderBreaker: fallbackResult.skipProviderBreaker,
|
|
})
|
|
) {
|
|
recordProviderFailure(provider, log, target.connectionId, profile);
|
|
}
|
|
|
|
// Check if this is a transient error worth retrying on same model.
|
|
// A token-limit 429 is terminal for the client — never retry it.
|
|
const isTransient =
|
|
!isStreamReadinessFailure &&
|
|
!isTokenLimitBreach &&
|
|
[408, 429, 500, 502, 503, 504].includes(result.status);
|
|
if (retry < maxRetries && isTransient && !providerExhausted) {
|
|
// Record model lockout immediately on the first transient failure —
|
|
// once the model is cooling down, retrying it would waste an upstream
|
|
// call and extend the cooldown via exponential backoff.
|
|
let lockoutRecorded = false;
|
|
if (provider && rawModel && retry === 0) {
|
|
const mlSettings = resolveModelLockoutSettings(settings);
|
|
if (mlSettings.enabled && mlSettings.errorCodes.includes(result.status)) {
|
|
recordModelLockoutFailure(
|
|
provider,
|
|
target.connectionId || "",
|
|
rawModel,
|
|
classifyLockoutReason(result.status),
|
|
result.status,
|
|
mlSettings.baseCooldownMs,
|
|
profile,
|
|
{
|
|
exactCooldownMs: mlSettings.useExponentialBackoff
|
|
? 0
|
|
: mlSettings.baseCooldownMs,
|
|
}
|
|
);
|
|
lockoutRecorded = true;
|
|
}
|
|
}
|
|
if (lockoutRecorded) {
|
|
log.info("COMBO", `Skipping retry for ${modelStr} — model lockout active`);
|
|
if (i > 0) fallbackCount++;
|
|
return null;
|
|
}
|
|
continue; // Retry same model (transient error, no lockout recorded)
|
|
}
|
|
|
|
// Done retrying this model
|
|
recordComboRequest(combo.name, modelStr, {
|
|
success: false,
|
|
latencyMs: Date.now() - startTime,
|
|
fallbackCount,
|
|
strategy,
|
|
target: toRecordedTarget(target),
|
|
});
|
|
recordedAttempts++;
|
|
lastError = errorText || String(result.status);
|
|
if (!lastStatus) lastStatus = result.status;
|
|
if (i > 0) fallbackCount++;
|
|
// Wire combo failures into the resilience dashboard (model-level lockout)
|
|
// alongside the provider-level cooldown below — they govern different scopes.
|
|
if (provider && rawModel) {
|
|
const mlSettings = resolveModelLockoutSettings(settings);
|
|
if (mlSettings.enabled && mlSettings.errorCodes.includes(result.status)) {
|
|
recordModelLockoutFailure(
|
|
provider,
|
|
target.connectionId || "",
|
|
rawModel,
|
|
classifyLockoutReason(result.status),
|
|
result.status,
|
|
mlSettings.baseCooldownMs,
|
|
profile,
|
|
{
|
|
exactCooldownMs: mlSettings.useExponentialBackoff ? 0 : mlSettings.baseCooldownMs,
|
|
}
|
|
);
|
|
}
|
|
}
|
|
log.warn("COMBO", `Model ${modelStr} failed, trying next`, { status: result.status });
|
|
|
|
if (resilienceSettings.providerCooldown.enabled && provider && provider !== "unknown") {
|
|
recordProviderCooldown(provider, target.connectionId ?? undefined, resilienceSettings);
|
|
}
|
|
|
|
const fallbackWaitMs =
|
|
fallbackDelayMs > 0 && cooldownMs > 0 && cooldownMs <= MAX_FALLBACK_WAIT_MS
|
|
? Math.min(cooldownMs, fallbackDelayMs)
|
|
: 0;
|
|
if ([502, 503, 504].includes(result.status) && fallbackWaitMs > 0) {
|
|
log.debug?.("COMBO", `Waiting ${fallbackWaitMs}ms before fallback to next model`);
|
|
await new Promise((resolve) => {
|
|
const timer = setTimeout(resolve, fallbackWaitMs);
|
|
signal?.addEventListener(
|
|
"abort",
|
|
() => {
|
|
clearTimeout(timer);
|
|
resolve(undefined);
|
|
},
|
|
{ once: true }
|
|
);
|
|
});
|
|
if (signal?.aborted) {
|
|
log.info("COMBO", `Client disconnected during fallback wait — aborting`);
|
|
return { ok: false, response: errorResponse(499, "Client disconnected") };
|
|
}
|
|
}
|
|
|
|
return null;
|
|
}
|
|
return null;
|
|
};
|
|
|
|
for (let i = 0; i < orderedTargets.length; i++) {
|
|
if (anySuccess) break;
|
|
|
|
const abortController = new AbortController();
|
|
abortControllers.set(i, abortController);
|
|
const onClientAbort = () => abortController.abort();
|
|
signal?.addEventListener("abort", onClientAbort);
|
|
|
|
const task = (async () => {
|
|
try {
|
|
const res = await executeTarget(i);
|
|
if (res && !anySuccess) {
|
|
if (res.ok) {
|
|
anySuccess = true;
|
|
globalResolve!(res.response!);
|
|
for (const [idx, ac] of abortControllers.entries()) {
|
|
if (idx !== i) ac.abort();
|
|
}
|
|
} else if (res.response) {
|
|
// Fatal error, abort combo
|
|
anySuccess = true;
|
|
globalResolve!(res.response);
|
|
}
|
|
}
|
|
} finally {
|
|
signal?.removeEventListener("abort", onClientAbort);
|
|
}
|
|
})().catch((err) => {
|
|
const logError = log.error ?? log.warn;
|
|
logError("COMBO", `Speculative task error for target ${i}`, err);
|
|
});
|
|
|
|
runningTasks.add(task);
|
|
task.finally(() => runningTasks.delete(task));
|
|
|
|
if (zeroLatencyOptimizationsEnabled && config.hedging && i + 1 < orderedTargets.length) {
|
|
const hedgeDelay = resolveDelayMs(config.hedgeDelayMs, 500);
|
|
let timeoutResolve: () => void;
|
|
const timeoutPromise = new Promise<void>((r) => {
|
|
timeoutResolve = r;
|
|
setTimeout(r, hedgeDelay);
|
|
});
|
|
await Promise.race([task, globalPromise, timeoutPromise]);
|
|
} else {
|
|
await Promise.race([task, globalPromise]);
|
|
}
|
|
}
|
|
|
|
if (!anySuccess && runningTasks.size > 0) {
|
|
await Promise.race([globalPromise, Promise.all([...runningTasks])]);
|
|
}
|
|
|
|
if (anySuccess) {
|
|
return await globalPromise;
|
|
}
|
|
|
|
// All models failed in this set try
|
|
const latencyMs = Date.now() - startTime;
|
|
if (recordedAttempts === 0) {
|
|
recordComboRequest(combo.name, null, {
|
|
success: false,
|
|
latencyMs,
|
|
fallbackCount,
|
|
strategy,
|
|
});
|
|
}
|
|
|
|
// Retry the entire set if more attempts remain
|
|
if (setTry < maxSetRetries) continue;
|
|
|
|
// All set retries exhausted — return the final error
|
|
if (!lastStatus) {
|
|
notifyWebhookEvent("request.failed", {
|
|
combo: combo.name,
|
|
reason: "ALL_ACCOUNTS_INACTIVE",
|
|
latencyMs,
|
|
fallbackCount,
|
|
});
|
|
return new Response(
|
|
JSON.stringify({
|
|
error: {
|
|
message: "Service temporarily unavailable: all upstream accounts are inactive",
|
|
type: "service_unavailable",
|
|
code: "ALL_ACCOUNTS_INACTIVE",
|
|
},
|
|
}),
|
|
{ status: 503, headers: { "Content-Type": "application/json" } }
|
|
);
|
|
}
|
|
|
|
const status = lastStatus;
|
|
const msg = lastError || "All combo models unavailable";
|
|
|
|
if (earliestRetryAfter) {
|
|
const retryHuman = formatRetryAfter(toRetryAfterDisplayValue(earliestRetryAfter));
|
|
log.warn("COMBO", `All models failed | ${msg} (${retryHuman})`);
|
|
return unavailableResponse(status, msg, earliestRetryAfter, retryHuman);
|
|
}
|
|
|
|
log.warn("COMBO", `All models failed | ${msg}`);
|
|
return new Response(JSON.stringify({ error: { message: msg } }), {
|
|
status,
|
|
headers: { "Content-Type": "application/json" },
|
|
});
|
|
}
|
|
|
|
return errorResponse(503, "Combo routing completed without an upstream response");
|
|
} finally {
|
|
// G2: Clean up candidate registry to prevent unbounded memory growth.
|
|
_unregisterExecutionCandidates(_registeredExecutionKeys);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Handle round-robin combo: each request goes to the next model in circular order.
|
|
* Uses semaphore-based concurrency control with queue + rate-limit awareness.
|
|
*
|
|
* Flow:
|
|
* 1. Pick target model via atomic counter (counter % models.length)
|
|
* 2. Acquire semaphore slot (may queue if at max concurrency)
|
|
* 3. Send request to target model
|
|
* 4. On 429 → mark model rate-limited, try next model in rotation
|
|
* 5. On semaphore timeout → fallback to next available model
|
|
*/
|
|
async function handleRoundRobinCombo({
|
|
body,
|
|
combo,
|
|
handleSingleModel,
|
|
isModelAvailable,
|
|
log,
|
|
settings,
|
|
allCombos,
|
|
signal,
|
|
}: HandleRoundRobinOptions): Promise<Response> {
|
|
const config = settings
|
|
? resolveComboConfig(combo, settings)
|
|
: { ...getDefaultComboConfig(), ...(combo.config || {}) };
|
|
const concurrency = config.concurrencyPerModel ?? 3;
|
|
const queueTimeout = config.queueTimeoutMs ?? 30000;
|
|
const maxRetries = config.maxRetries ?? 1;
|
|
const retryDelayMs = resolveDelayMs(config.retryDelayMs, 2000);
|
|
const fallbackDelayMs = resolveDelayMs(config.fallbackDelayMs, 0);
|
|
const reasoningTokenBufferEnabled = config.reasoningTokenBufferEnabled !== false;
|
|
|
|
const resilienceSettings: ResilienceSettings = settings
|
|
? resolveResilienceSettings(settings)
|
|
: resolveResilienceSettings(null);
|
|
|
|
const orderedTargets = resolveComboTargets(
|
|
combo,
|
|
allCombos,
|
|
clampComboDepth(config.maxComboDepth)
|
|
);
|
|
const tagFilteredTargets = await applyRequestTagRouting(orderedTargets, body, log);
|
|
const evalRankedTargets = orderTargetsByEvalScores(tagFilteredTargets, config.evalRouting, log);
|
|
const filteredTargets = filterTargetsByRequestCompatibility(
|
|
evalRankedTargets,
|
|
body,
|
|
log,
|
|
"Context-aware round-robin fallback"
|
|
);
|
|
const modelCount = filteredTargets.length;
|
|
if (modelCount === 0) {
|
|
return comboModelNotFoundResponse("Round-robin combo has no executable targets");
|
|
}
|
|
|
|
scheduleShadowRouting(
|
|
combo,
|
|
config,
|
|
body,
|
|
resolveShadowTargets(combo, config, allCombos),
|
|
handleSingleModel,
|
|
isModelAvailable,
|
|
"round-robin",
|
|
log
|
|
);
|
|
|
|
// Sticky batch size at the combo level. Reuses the global `stickyRoundRobinLimit`
|
|
// setting so a single knob controls sticky batching for both account fallback and
|
|
// combo targets. Values <= 1 preserve the historical one-request-per-target rotation.
|
|
const stickyLimit = clampStickyRoundRobinTargetLimit(
|
|
(settings as Record<string, unknown> | null)?.stickyRoundRobinLimit
|
|
);
|
|
const stickyRoundRobinEnabled = stickyLimit > 1;
|
|
if (
|
|
!rrCounters.has(combo.name) &&
|
|
!rrStickyTargets.has(combo.name) &&
|
|
rrCounters.size >= MAX_RR_COUNTERS
|
|
) {
|
|
const oldest = rrCounters.keys().next().value;
|
|
if (oldest !== undefined) {
|
|
rrCounters.delete(oldest);
|
|
rrStickyTargets.delete(oldest);
|
|
}
|
|
}
|
|
// Ensure rrCounters has an entry for this combo so the eviction logic above
|
|
// applies to both maps even when sticky round-robin is enabled (in which
|
|
// case rrCounters isn't incremented per request).
|
|
if (!rrCounters.has(combo.name)) {
|
|
rrCounters.set(combo.name, 0);
|
|
}
|
|
const { startIndex, counter } = getStickyRoundRobinStartIndex(
|
|
combo.name,
|
|
filteredTargets,
|
|
stickyLimit
|
|
);
|
|
if (!stickyRoundRobinEnabled) {
|
|
rrCounters.set(combo.name, counter + 1);
|
|
}
|
|
|
|
const clientRequestedStream = body?.stream === true;
|
|
const startTime = Date.now();
|
|
let lastError: string | null = null;
|
|
let lastStatus: number | null = null;
|
|
let earliestRetryAfter: ComboRetryAfter | null = null;
|
|
let globalAttempts = 0;
|
|
let fallbackCount = 0;
|
|
let recordedAttempts = 0;
|
|
|
|
// #1731: Per-request in-memory set of providers whose quota is fully exhausted.
|
|
// When a target returns a quota-exhausted 429, remaining targets from the same
|
|
// provider are skipped to avoid the cascade through N same-provider targets.
|
|
const exhaustedProviders = new Set<string>();
|
|
const exhaustedConnections = new Set<string>();
|
|
const transientRateLimitedProviders = new Set<string>();
|
|
|
|
// Try each model starting from the round-robin target
|
|
for (let offset = 0; offset < modelCount; offset++) {
|
|
const modelIndex = (startIndex + offset) % modelCount;
|
|
const target = filteredTargets[modelIndex];
|
|
const modelStr = target.modelStr;
|
|
const provider = target.provider;
|
|
const profile = await getRuntimeProviderProfile(provider);
|
|
const semaphoreKey = `combo:${combo.name}:${target.executionKey}`;
|
|
const allowRateLimitedConnection =
|
|
Boolean(provider && provider !== "unknown") && transientRateLimitedProviders.has(provider);
|
|
const targetForAttempt = allowRateLimitedConnection
|
|
? { ...target, allowRateLimitedConnection: true }
|
|
: target;
|
|
|
|
// Pre-check availability
|
|
if (isModelAvailable) {
|
|
const available = await isModelAvailable(modelStr, targetForAttempt);
|
|
if (!available) {
|
|
log.debug?.(
|
|
"COMBO-RR",
|
|
`Skipping ${modelStr} — no credentials available or model excluded`
|
|
);
|
|
if (offset > 0) fallbackCount++;
|
|
continue;
|
|
}
|
|
}
|
|
|
|
if (
|
|
resilienceSettings.providerCooldown.enabled &&
|
|
Boolean(provider && provider !== "unknown") &&
|
|
isProviderInCooldown(provider, target.connectionId as string | undefined, resilienceSettings)
|
|
) {
|
|
log.info("COMBO-RR", `Skipping ${modelStr} — provider ${provider} in global cooldown`);
|
|
if (offset > 0) fallbackCount++;
|
|
continue;
|
|
}
|
|
|
|
// #1731: Skip targets from a provider that already signaled full quota exhaustion
|
|
// this request.
|
|
// #1731v2: Skip targets whose provider:connection pair had a connection-level error.
|
|
if (provider && target.connectionId) {
|
|
const connKey = `${provider}:${target.connectionId}`;
|
|
if (exhaustedConnections.has(connKey)) {
|
|
log.info(
|
|
"COMBO-RR",
|
|
`Skipping ${modelStr} — connection ${target.connectionId} for provider ${provider} had connection error (#1731v2)`
|
|
);
|
|
if (offset > 0) fallbackCount++;
|
|
continue;
|
|
}
|
|
}
|
|
if (provider && exhaustedProviders.has(provider)) {
|
|
log.info(
|
|
"COMBO-RR",
|
|
`Skipping ${modelStr} — provider ${provider} marked exhausted this request (#1731)`
|
|
);
|
|
if (offset > 0) fallbackCount++;
|
|
continue;
|
|
}
|
|
|
|
// Acquire semaphore slot (may wait in queue)
|
|
let release: () => void;
|
|
try {
|
|
release = await semaphore.acquire(semaphoreKey, {
|
|
maxConcurrency: concurrency,
|
|
timeoutMs: queueTimeout,
|
|
});
|
|
} catch (err) {
|
|
const errCode = isRecord(err) && typeof err.code === "string" ? err.code : null;
|
|
if (errCode === "SEMAPHORE_TIMEOUT" || errCode === "SEMAPHORE_QUEUE_FULL") {
|
|
log.warn(
|
|
"COMBO-RR",
|
|
`Semaphore ${errCode === "SEMAPHORE_QUEUE_FULL" ? "queue full" : "timeout"} for ${modelStr}, trying next model`
|
|
);
|
|
if (offset > 0) fallbackCount++;
|
|
continue;
|
|
}
|
|
throw err;
|
|
}
|
|
|
|
// Retry loop within this model
|
|
try {
|
|
for (let retry = 0; retry <= maxRetries; retry++) {
|
|
globalAttempts++;
|
|
if (globalAttempts > MAX_GLOBAL_ATTEMPTS) {
|
|
log.warn(
|
|
"COMBO-RR",
|
|
`Maximum combo attempts (${MAX_GLOBAL_ATTEMPTS}) exceeded. Terminating loop to prevent runaway requests.`
|
|
);
|
|
return errorResponse(503, "Maximum combo retry limit reached");
|
|
}
|
|
if (retry > 0) {
|
|
log.info(
|
|
"COMBO-RR",
|
|
`Retrying ${modelStr} in ${retryDelayMs}ms (attempt ${retry + 1}/${maxRetries + 1})`
|
|
);
|
|
await new Promise((r) => setTimeout(r, retryDelayMs));
|
|
}
|
|
|
|
log.info(
|
|
"COMBO-RR",
|
|
`[RR #${counter}] → ${modelStr}${offset > 0 ? ` (fallback +${offset})` : ""}${retry > 0 ? ` (retry ${retry})` : ""}`
|
|
);
|
|
|
|
// Issue #3587: Reasoning models can spend the whole output budget on
|
|
// reasoning. Apply any safe buffer to a per-attempt copy so round-robin
|
|
// retries never compound across models.
|
|
let attemptBody = body;
|
|
{
|
|
const bodyRecord = body as Record<string, unknown>;
|
|
const currentMaxTokens = toPositiveInteger(bodyRecord.max_tokens);
|
|
const bufferedMaxTokens = resolveReasoningBufferedMaxTokens(
|
|
modelStr,
|
|
bodyRecord.max_tokens,
|
|
{ enabled: reasoningTokenBufferEnabled }
|
|
);
|
|
if (
|
|
currentMaxTokens !== null &&
|
|
bufferedMaxTokens !== null &&
|
|
bufferedMaxTokens !== currentMaxTokens
|
|
) {
|
|
attemptBody = {
|
|
...bodyRecord,
|
|
max_tokens: bufferedMaxTokens,
|
|
} as typeof body;
|
|
log.info(
|
|
"COMBO-RR",
|
|
`Reasoning model ${modelStr}: adjusted max_tokens ${currentMaxTokens} -> ${bufferedMaxTokens}`
|
|
);
|
|
}
|
|
}
|
|
|
|
const result = await handleSingleModel(attemptBody, modelStr, {
|
|
...targetForAttempt,
|
|
failoverBeforeRetry: config.failoverBeforeRetry,
|
|
});
|
|
|
|
// Success — validate response quality before returning
|
|
if (result.ok) {
|
|
const quality = await validateResponseQuality(result, clientRequestedStream, log);
|
|
if (!quality.valid) {
|
|
log.warn(
|
|
"COMBO-RR",
|
|
`${modelStr} returned 200 but failed quality check: ${quality.reason}`
|
|
);
|
|
recordComboRequest(combo.name, modelStr, {
|
|
success: false,
|
|
latencyMs: Date.now() - startTime,
|
|
fallbackCount,
|
|
strategy: "round-robin",
|
|
target: toRecordedTarget(target),
|
|
});
|
|
recordedAttempts++;
|
|
// Fix #1707: Set terminal state so the fallback doesn't emit
|
|
// misleading ALL_ACCOUNTS_INACTIVE when the real issue is quality.
|
|
lastError = `Upstream response failed quality validation: ${quality.reason}`;
|
|
if (!lastStatus) lastStatus = 502;
|
|
if (offset > 0) fallbackCount++;
|
|
break; // move to next model
|
|
}
|
|
const latencyMs = Date.now() - startTime;
|
|
log.info(
|
|
"COMBO-RR",
|
|
`${modelStr} succeeded (${latencyMs}ms, ${fallbackCount} fallbacks)`
|
|
);
|
|
recordComboRequest(combo.name, modelStr, {
|
|
success: true,
|
|
latencyMs,
|
|
fallbackCount,
|
|
strategy: "round-robin",
|
|
target: toRecordedTarget(target),
|
|
});
|
|
recordedAttempts++;
|
|
|
|
if (provider && provider !== "unknown") {
|
|
recordProviderSuccess(provider, target.connectionId ?? undefined);
|
|
}
|
|
|
|
if (stickyRoundRobinEnabled) {
|
|
recordStickyRoundRobinSuccess(combo.name, target, stickyLimit, filteredTargets);
|
|
}
|
|
|
|
if (provider) {
|
|
const connId = target.connectionId || undefined;
|
|
void (async () => {
|
|
try {
|
|
const { setLKGP } = await import("../../src/lib/localDb");
|
|
await Promise.all([
|
|
setLKGP(combo.name, target.executionKey, provider, connId),
|
|
setLKGP(combo.name, combo.id || combo.name, provider, connId),
|
|
]);
|
|
} catch (err) {
|
|
log.warn(
|
|
"COMBO-RR",
|
|
"Failed to record Last Known Good Provider. This is non-fatal.",
|
|
{
|
|
err,
|
|
}
|
|
);
|
|
}
|
|
})();
|
|
}
|
|
// validateResponseQuality peeks streaming bodies via getReader(),
|
|
// which locks `result.body`. It returns a clonedResponse that replays
|
|
// the buffered prefix and forwards the rest. Returning the original
|
|
// (now-locked) `result` makes Next.js throw "ReadableStream is locked"
|
|
// → 500. Mirror the priority strategy and return the replay response.
|
|
return quality.clonedResponse ?? result;
|
|
}
|
|
|
|
// Extract error info
|
|
let errorText = result.statusText || "";
|
|
let retryAfter: ComboRetryAfter | null = null;
|
|
let errorBody: ComboErrorBody = null;
|
|
try {
|
|
const cloned = result.clone();
|
|
try {
|
|
const text = await cloned.text();
|
|
if (text) {
|
|
errorText = text.substring(0, 500);
|
|
errorBody = JSON.parse(text);
|
|
const parsedError = errorBody?.error;
|
|
errorText =
|
|
(typeof parsedError === "object" && parsedError?.message) ||
|
|
(typeof parsedError === "string" ? parsedError : null) ||
|
|
errorBody?.message ||
|
|
errorText;
|
|
retryAfter = errorBody?.retryAfter || null;
|
|
}
|
|
} catch {
|
|
/* Clone parse failed */
|
|
}
|
|
} catch {
|
|
/* Clone failed */
|
|
}
|
|
|
|
if (result.status === 499) {
|
|
log.info(
|
|
"COMBO-RR",
|
|
`Client disconnected (499) during ${modelStr} — stopping combo loop`
|
|
);
|
|
recordComboRequest(combo.name, modelStr, {
|
|
success: false,
|
|
latencyMs: Date.now() - startTime,
|
|
fallbackCount,
|
|
strategy: "round-robin",
|
|
target: toRecordedTarget(target),
|
|
});
|
|
recordedAttempts++;
|
|
return result;
|
|
}
|
|
|
|
if (
|
|
retryAfter &&
|
|
(!earliestRetryAfter || new Date(retryAfter) < new Date(earliestRetryAfter))
|
|
) {
|
|
earliestRetryAfter = retryAfter;
|
|
}
|
|
|
|
if (typeof errorText !== "string") {
|
|
try {
|
|
errorText = JSON.stringify(errorText);
|
|
} catch {
|
|
errorText = String(errorText);
|
|
}
|
|
}
|
|
|
|
const isStreamReadinessFailure =
|
|
(result.status === 502 || result.status === 504) &&
|
|
isStreamReadinessFailureErrorBody(errorBody);
|
|
|
|
// FIX 5: a local per-API-key token-limit 429 must not cool shared accounts.
|
|
const isTokenLimitBreach = result.status === 429 && isTokenLimitBreachErrorBody(errorBody);
|
|
|
|
// Round-robin uses the same target-level fallback rule as other combo
|
|
// strategies: non-ok target responses fall through to the next target.
|
|
// Classification stays here only to support cooldown/semaphore pacing,
|
|
// not to decide whether fallback is allowed.
|
|
const rawError = errorBody?.error;
|
|
const structuredError =
|
|
rawError && typeof rawError === "object"
|
|
? {
|
|
// Upstream JSON may carry a numeric `code`/`type` (e.g. {"code":40001}).
|
|
// Coerce to string if present instead of discarding, so downstream string
|
|
// ops (.toLowerCase, .startsWith) can run safely without type crashes.
|
|
code:
|
|
(rawError as Record<string, unknown>).code !== undefined &&
|
|
(rawError as Record<string, unknown>).code !== null
|
|
? String((rawError as Record<string, unknown>).code)
|
|
: undefined,
|
|
type:
|
|
(rawError as Record<string, unknown>).type !== undefined &&
|
|
(rawError as Record<string, unknown>).type !== null
|
|
? String((rawError as Record<string, unknown>).type)
|
|
: undefined,
|
|
}
|
|
: undefined;
|
|
const fallbackResult = checkFallbackError(
|
|
result.status,
|
|
errorText,
|
|
0,
|
|
null,
|
|
provider,
|
|
result.headers,
|
|
profile,
|
|
structuredError
|
|
);
|
|
const { cooldownMs } = fallbackResult;
|
|
|
|
const isAllAccountsRateLimited = isAllAccountsRateLimitedResponse(
|
|
result.status,
|
|
result.headers?.get("content-type") ?? null,
|
|
errorText
|
|
);
|
|
|
|
// #1731: If the entire provider quota is exhausted, mark it so subsequent
|
|
// same-provider targets are skipped immediately. API-key 429s still use
|
|
// the short resilience cooldown, but explicit quota text should stop the
|
|
// combo from trying another target for the same provider in this request.
|
|
// Passthrough/per-model-quota providers multiplex independent upstream
|
|
// models behind one provider connection; a quota 429 for one model must
|
|
// not skip fallback targets for another model on the same provider.
|
|
const providerExhausted =
|
|
Boolean(provider && provider !== "unknown") &&
|
|
!hasPerModelQuota(provider, parseModel(modelStr).model || modelStr) &&
|
|
(isProviderExhaustedReason(fallbackResult) ||
|
|
classifyErrorText(errorText) === RateLimitReason.QUOTA_EXHAUSTED ||
|
|
isAllAccountsRateLimited);
|
|
if (providerExhausted) {
|
|
exhaustedProviders.add(provider);
|
|
log.debug?.(
|
|
"COMBO-RR",
|
|
`Provider ${provider} quota exhausted — marking for skip (#1731)`
|
|
);
|
|
} else if (
|
|
result.status === 429 &&
|
|
!isTokenLimitBreach &&
|
|
provider &&
|
|
provider !== "unknown"
|
|
) {
|
|
transientRateLimitedProviders.add(provider);
|
|
}
|
|
|
|
// #1731v2: Connection-level errors (502/503/504) — skip remaining same-connection targets
|
|
if (
|
|
!providerExhausted &&
|
|
provider &&
|
|
provider !== "unknown" &&
|
|
[408, 500, 502, 503, 504, 524].includes(result.status) &&
|
|
!isProviderCircuitOpenResult(result, errorText)
|
|
) {
|
|
const connId = target.connectionId as string | undefined;
|
|
if (connId) {
|
|
exhaustedConnections.add(`${provider}:${connId}`);
|
|
log.info(
|
|
"COMBO-RR",
|
|
`Provider ${provider} connection ${connId} error (${result.status}) — marking for skip (#1731v2)`
|
|
);
|
|
} else {
|
|
exhaustedProviders.add(provider);
|
|
log.info(
|
|
"COMBO-RR",
|
|
`Provider ${provider} connection error (${result.status}) — marking for skip (#1731)`
|
|
);
|
|
}
|
|
}
|
|
|
|
// Transient errors → mark in semaphore so round-robin stops stampeding this target.
|
|
if (
|
|
!isStreamReadinessFailure &&
|
|
!isTokenLimitBreach &&
|
|
TRANSIENT_FOR_SEMAPHORE.includes(result.status) &&
|
|
cooldownMs > 0
|
|
) {
|
|
semaphore.markRateLimited(semaphoreKey, cooldownMs);
|
|
log.warn("COMBO-RR", `${modelStr} error ${result.status}, cooldown ${cooldownMs}ms`);
|
|
}
|
|
|
|
if (isAllAccountsRateLimited) {
|
|
log.info(
|
|
"COMBO-RR",
|
|
`All accounts rate-limited for ${modelStr}, falling back to next model`
|
|
);
|
|
}
|
|
|
|
// Transient error → retry same model.
|
|
// A token-limit 429 is terminal for the client — never retry it.
|
|
const isTransient =
|
|
!isStreamReadinessFailure &&
|
|
!isTokenLimitBreach &&
|
|
[408, 429, 500, 502, 503, 504].includes(result.status);
|
|
if (retry < maxRetries && isTransient && !providerExhausted) {
|
|
continue;
|
|
}
|
|
|
|
// Done with this model
|
|
recordComboRequest(combo.name, modelStr, {
|
|
success: false,
|
|
latencyMs: Date.now() - startTime,
|
|
fallbackCount,
|
|
strategy: "round-robin",
|
|
target: toRecordedTarget(target),
|
|
});
|
|
recordedAttempts++;
|
|
lastError = errorText || String(result.status);
|
|
if (!lastStatus) lastStatus = result.status;
|
|
if (offset > 0) fallbackCount++;
|
|
log.warn("COMBO-RR", `${modelStr} failed, trying next model`, { status: result.status });
|
|
|
|
if (resilienceSettings.providerCooldown.enabled && provider && provider !== "unknown") {
|
|
recordProviderCooldown(provider, target.connectionId ?? undefined, resilienceSettings);
|
|
}
|
|
|
|
const fallbackWaitMs =
|
|
fallbackDelayMs > 0 && cooldownMs > 0 && cooldownMs <= MAX_FALLBACK_WAIT_MS
|
|
? Math.min(cooldownMs, fallbackDelayMs)
|
|
: 0;
|
|
if ([502, 503, 504].includes(result.status) && fallbackWaitMs > 0) {
|
|
log.debug?.("COMBO-RR", `Waiting ${fallbackWaitMs}ms before fallback to next model`);
|
|
await new Promise((resolve) => {
|
|
const timer = setTimeout(resolve, fallbackWaitMs);
|
|
signal?.addEventListener(
|
|
"abort",
|
|
() => {
|
|
clearTimeout(timer);
|
|
resolve(undefined);
|
|
},
|
|
{ once: true }
|
|
);
|
|
});
|
|
if (signal?.aborted) {
|
|
log.info("COMBO-RR", `Client disconnected during fallback wait — aborting`);
|
|
return errorResponse(499, "Client disconnected");
|
|
}
|
|
}
|
|
|
|
break;
|
|
}
|
|
} finally {
|
|
// ALWAYS release semaphore slot
|
|
release();
|
|
}
|
|
}
|
|
|
|
// All models exhausted
|
|
const latencyMs = Date.now() - startTime;
|
|
if (recordedAttempts === 0) {
|
|
recordComboRequest(combo.name, null, {
|
|
success: false,
|
|
latencyMs,
|
|
fallbackCount,
|
|
strategy: "round-robin",
|
|
});
|
|
}
|
|
|
|
if (!lastStatus) {
|
|
return new Response(
|
|
JSON.stringify({
|
|
error: {
|
|
message: "Service temporarily unavailable: all upstream accounts are inactive",
|
|
type: "service_unavailable",
|
|
code: "ALL_ACCOUNTS_INACTIVE",
|
|
},
|
|
}),
|
|
{ status: 503, headers: { "Content-Type": "application/json" } }
|
|
);
|
|
}
|
|
|
|
const status = lastStatus;
|
|
const msg = lastError || "All round-robin combo models unavailable";
|
|
|
|
if (earliestRetryAfter) {
|
|
const retryHuman = formatRetryAfter(toRetryAfterDisplayValue(earliestRetryAfter));
|
|
log.warn("COMBO-RR", `All models failed | ${msg} (${retryHuman})`);
|
|
return unavailableResponse(status, msg, earliestRetryAfter, retryHuman);
|
|
}
|
|
|
|
log.warn("COMBO-RR", `All models failed | ${msg}`);
|
|
return new Response(JSON.stringify({ error: { message: msg } }), {
|
|
status,
|
|
headers: { "Content-Type": "application/json" },
|
|
});
|
|
}
|