wehub-resource-sync
3086 lines
123 KiB
TypeScript
3086 lines
123 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, context-relay, and fusion strategies
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*/
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import {
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checkFallbackError,
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classifyLockoutReason,
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decayModelFailureCount,
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formatRetryAfter,
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getModelLockoutInfo,
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getRuntimeProviderProfile,
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hasPerModelQuota,
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isModelLocked,
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recordModelLockoutFailure,
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recordProviderFailure,
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selectLockoutCooldownMs,
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} from "./accountFallback.ts";
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import { errorResponse, unavailableResponse } from "../utils/error.ts";
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import { buildTargetTimeoutRunner } from "./combo/targetTimeoutRunner.ts";
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import { recordComboRequest, recordComboShadowRequest, getComboMetrics } from "./comboMetrics.ts";
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import {
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resolveComboConfig,
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getDefaultComboConfig,
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resolveComboQueueDepth,
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} from "./comboConfig.ts";
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import {
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maybeGenerateHandoff,
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maybeGenerateUniversalHandoff,
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injectUniversalHandoffBody,
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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 { getHiddenModelsByProvider } from "@/models";
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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 { evaluateQuotaCutoff, getQuotaFetcher, type QuotaInfo } 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 { createComboContext } from "./combo/context.ts";
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import { phaseComboSetup } from "./combo/comboSetup.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 { parseAutoPrefix } from "./autoCombo/autoPrefix.ts";
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import { resolveAutoStrategyOrder } from "./combo/resolveAutoStrategy.ts";
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import { applyStrategyOrdering } from "./combo/applyStrategyOrdering.ts";
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import { handlePipelineCombo, buildPipelineResponse } from "./autoCombo/pipelineRouter.ts";
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import { type ProviderCandidate } from "./autoCombo/scoring.ts";
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import { estimateTokens } from "./contextManager.ts";
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import { getSessionConnection } from "./sessionManager.ts";
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import {
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applySessionStickiness,
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recordStickyBinding,
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resolveDisableSessionStickiness,
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} from "./combo/sessionStickiness.ts";
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import { selectQuotaShareTarget } from "./combo/quotaShareStrategy.ts";
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import { makeConnectionConcurrencyResolver, lookupPositiveCap } from "./combo/concurrencyCaps.ts";
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import { acquireQuotaShareConcurrencySlot } from "./combo/quotaShareConcurrency.ts";
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import { orderTargetsByEvalScores } from "./evalRouting.ts";
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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 {
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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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ComboLike,
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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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NestedComboMode,
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ResolvedComboTarget,
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ResolvedComboUnit,
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AutoProviderCandidate,
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ComboRuntimeStep,
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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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weightedStickyTargets,
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clampStickyRoundRobinTargetLimit,
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clampStickyWeightedTargetLimit,
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getStickyRoundRobinStartIndex,
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recordStickyRoundRobinSuccess,
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getStickyWeightedExecutionKey,
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recordStickyWeightedSuccess,
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} from "./combo/rrState.ts";
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import {
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validateResponseQuality,
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releaseQualityClone,
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toRetryAfterDisplayValue,
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} from "./combo/validateQuality.ts";
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import { resolveComboCooldownWaitDecision } from "./combo/comboCooldownRetry.ts";
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import {
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computeClosestRetryAfter,
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waitForCooldownAwareRetry,
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} from "../../src/sse/services/cooldownAwareRetry.ts";
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import { handleFusionChat, type FusionTuning } from "./fusion.ts";
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import { handlePipelineChat, type PipelineStep } from "./pipeline.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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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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getExhaustedTargetSkipReason,
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} from "./combo/comboPredicates.ts";
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import { applyComboTargetExhaustion } from "./combo/targetExhaustion.ts";
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import { executeRuntimeUnitCombo } from "./combo/runtimeUnits.ts";
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import { isRecord } from "./combo/comboData.ts";
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import {
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expandProviderWildcardsInCombo,
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expandProviderWildcardsInCollection,
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} from "./combo/providerWildcard.ts";
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import { resolveShadowTargets, scheduleShadowRouting } from "./combo/shadowRouting.ts";
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import { attemptCompatRejectedFallback } from "./combo/comboCompatFallback.ts";
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import {
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filterTargetsByRequestCompatibility,
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resolveComboRuntimeUnits,
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resolveComboTargets,
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resolveWeightedTargets,
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resolveWeightedStepGroups,
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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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applyRequestTagRouting,
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scoreAutoTargets,
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expandAutoComboCandidatePool,
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} from "./combo/autoStrategy.ts";
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import {
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resolveResetWindowConfig,
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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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type PreScreenResult,
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} from "./combo/quotaStrategies.ts";
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import {
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buildAutoQuotaThresholds,
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resolveQuotaExhaustionCutoffForTarget,
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} from "./combo/quotaExhaustionCutoff.ts";
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import {
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classifyTask,
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getConversationCacheKey,
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isTaskRoutingStrategy,
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reorderByTaskWeight,
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} from "./taskAwareRouting.ts";
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import { expandTargetsByFingerprints } from "./combo/fingerprintExpansion.ts";
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export { RESET_WINDOW_NAMES };
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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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export { preScreenTargets };
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export { resolveComboRuntimeUnits, 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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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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const OUTPUT_TOKEN_RATIO = 0.4;
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function normalizeNestedComboMode(value: unknown): NestedComboMode {
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return value === "execute" ? "execute" : "flatten";
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}
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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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function clampPercent(value: number): number {
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if (!Number.isFinite(value)) return 100;
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return Math.max(0, Math.min(100, value));
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}
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function quotaRemainingPercentFromQuota(quota: unknown): number {
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if (!quota || typeof quota !== "object") return 100;
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const record = quota as Record<string, unknown>;
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if (record.limitReached === true) return 0;
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const windows = record.windows;
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if (windows && typeof windows === "object" && !Array.isArray(windows)) {
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let minRemaining: number | null = null;
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for (const windowInfo of Object.values(windows as Record<string, unknown>)) {
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if (!windowInfo || typeof windowInfo !== "object") continue;
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const percentUsed = Number((windowInfo as Record<string, unknown>).percentUsed);
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if (!Number.isFinite(percentUsed)) continue;
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const remaining = clampPercent((1 - percentUsed) * 100);
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minRemaining = minRemaining === null ? remaining : Math.min(minRemaining, remaining);
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}
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if (minRemaining !== null) return minRemaining;
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}
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const percentUsed = Number(record.percentUsed);
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if (Number.isFinite(percentUsed)) return clampPercent((1 - percentUsed) * 100);
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return 100;
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}
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const QUOTA_BLOCKING_CONNECTION_STATUSES = new Set([
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"banned",
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"credits_exhausted",
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"deactivated",
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"expired",
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"rate_limited",
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]);
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function normalizeConnectionStatus(value: unknown): string {
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return typeof value === "string" ? value.trim().toLowerCase() : "";
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}
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function hasFutureRateLimitUntil(value: unknown): boolean {
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if (value == null || value === "") return false;
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const time = new Date(String(value)).getTime();
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return Number.isFinite(time) && time > Date.now();
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}
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export function getConnectionStatusQuotaCutoffReason(
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connection: Record<string, unknown> | undefined
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): string | undefined {
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if (!connection) return undefined;
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const status = normalizeConnectionStatus(connection.testStatus);
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if (QUOTA_BLOCKING_CONNECTION_STATUSES.has(status)) return status;
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if (status === "unavailable" && hasFutureRateLimitUntil(connection.rateLimitedUntil)) {
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return "rate_limited";
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}
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return undefined;
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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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resilienceSettings: ResilienceSettings | null = null
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): Promise<AutoProviderCandidate[]> {
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const hiddenModelsMap = getHiddenModelsByProvider();
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const metrics = getComboMetrics(comboName);
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// Opt-in hard quota cutoff (default OFF). When disabled, candidates are never
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// dropped for low quota here — the soft quota penalty + connection cooldown still
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// apply, so auto-routing behavior is unchanged.
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const quotaCutoffEnabled =
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(resilienceSettings ?? resolveResilienceSettings(null))?.quotaPreflight?.enabled === true;
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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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const connectionById = new Map<string, 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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for (const connection of active) {
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if (connection && typeof connection === "object" && typeof connection.id === "string") {
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connectionById.set(connection.id, connection as Record<string, unknown>);
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}
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}
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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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const allowedConnectionIds = Array.isArray(target.allowedConnectionIds)
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? new Set(
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target.allowedConnectionIds.filter(
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(connectionId): connectionId is string =>
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typeof connectionId === "string" && connectionId.trim().length > 0
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)
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)
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: null;
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const scopedConnectionIds = allowedConnectionIds
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? connectionIds.filter((connectionId) => allowedConnectionIds.has(connectionId))
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: connectionIds;
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if (scopedConnectionIds.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 scopedConnectionIds) {
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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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// #5521: Expand fingerprint-based providers (mimocode, mcode, opencode) so each
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// fingerprint gets its own combo slot instead of being bundled into one connection.
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const fingerprintExpandedTargets = expandTargetsByFingerprints(
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expandedTargets,
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connectionById,
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(t) => {
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const parsed = parseModel(t.modelStr);
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return t.provider || parsed.provider || parsed.providerAlias || "unknown";
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}
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);
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const candidates = await Promise.all(
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fingerprintExpandedTargets.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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|
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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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let quotaRemaining = 100;
|
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let quotaCutoffBlocked = false;
|
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let quotaCutoffReason: string | undefined;
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const fetcher = getQuotaFetcher(provider);
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const connection = target.connectionId ? connectionById.get(target.connectionId) : undefined;
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// Gate the terminal-status cutoff behind the same opt-in as the quota-percent
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// cutoff (#4483): when quota cutoff is disabled, a connection in a terminal
|
|
// testStatus must still fall through to normal connection-cooldown / model-lockout
|
|
// handling instead of being hard-blocked here (which would surface a misleading
|
|
// "below quota cutoff" 429 when every candidate is transiently unavailable).
|
|
// The connection's terminal/transient status (credits_exhausted / rate_limited /
|
|
// banned / expired / future-dated unavailable) is classified unconditionally.
|
|
const connectionStatusReason = getConnectionStatusQuotaCutoffReason(connection);
|
|
const statusCutoffReason = quotaCutoffEnabled ? connectionStatusReason : undefined;
|
|
// #4540: when the HARD cutoff is OFF (default), a status-flagged connection is NOT
|
|
// hard-blocked (that would surface a misleading "below quota cutoff" 429), but it
|
|
// also must not score identically to a healthy provider. A no-fetcher exhausted
|
|
// connection keeps quotaRemaining=100, so we tag a SOFT penalty applied at scoring
|
|
// time (scoreAutoTargets → STATUS_SOFT_DEPRIORITIZE_FACTOR) instead.
|
|
let statusPenalty = false;
|
|
let statusPenaltyReason: string | undefined;
|
|
if (statusCutoffReason) {
|
|
quotaCutoffBlocked = true;
|
|
quotaCutoffReason = statusCutoffReason;
|
|
quotaRemaining = 0;
|
|
} else if (connectionStatusReason) {
|
|
statusPenalty = true;
|
|
statusPenaltyReason = connectionStatusReason;
|
|
}
|
|
if (fetcher && target.connectionId) {
|
|
const quotaKey = `${provider}:${target.connectionId}`;
|
|
if (!quotaPromises.has(quotaKey)) {
|
|
quotaPromises.set(
|
|
quotaKey,
|
|
fetchResetAwareQuotaWithCache({
|
|
provider,
|
|
connectionId: target.connectionId,
|
|
connection,
|
|
fetcher,
|
|
config: resetWindowConfig,
|
|
log: {},
|
|
comboName,
|
|
})
|
|
);
|
|
}
|
|
const quota = await quotaPromises.get(quotaKey)!;
|
|
resetWindowAffinity = calculateResetWindowAffinity(quota, resetWindowConfig);
|
|
if (!quotaCutoffBlocked) {
|
|
quotaRemaining = quotaRemainingPercentFromQuota(quota);
|
|
}
|
|
if (!quotaCutoffBlocked && quotaCutoffEnabled) {
|
|
const cutoffDecision = evaluateQuotaCutoff(
|
|
quota as QuotaInfo | null,
|
|
buildAutoQuotaThresholds(provider, connection, resilienceSettings)
|
|
);
|
|
if (!cutoffDecision.proceed) {
|
|
quotaCutoffBlocked = true;
|
|
quotaCutoffReason = cutoffDecision.reason || "quota_exhausted";
|
|
}
|
|
}
|
|
}
|
|
|
|
return {
|
|
stepId: target.stepId,
|
|
executionKey: target.executionKey,
|
|
modelStr,
|
|
provider,
|
|
model,
|
|
quotaRemaining,
|
|
quotaTotal: 100,
|
|
circuitBreakerState,
|
|
costPer1MTokens,
|
|
p95LatencyMs,
|
|
latencyStdDev,
|
|
errorRate,
|
|
accountTier: "standard" as const,
|
|
quotaResetIntervalSecs: 86400,
|
|
contextAffinity,
|
|
resetWindowAffinity,
|
|
quotaCutoffBlocked,
|
|
quotaCutoffReason,
|
|
statusPenalty,
|
|
statusPenaltyReason,
|
|
connectionPoolSize: connectionPoolCounts.get(provider) ?? 1,
|
|
connectionId: target.connectionId ?? undefined,
|
|
};
|
|
})
|
|
);
|
|
|
|
// Filter out candidates whose model is hidden by the user in the dashboard
|
|
return candidates.filter((c) => {
|
|
const hiddenModels = hiddenModelsMap.get(c.provider);
|
|
return !hiddenModels?.has(c.model);
|
|
});
|
|
}
|
|
|
|
const TERMINAL_PIN_STATUSES = new Set(["credits_exhausted", "banned", "expired"]);
|
|
|
|
/**
|
|
* Pure decision: should a context-cache pin be DROPPED because its provider has
|
|
* DURABLY fallen? A ccp pin keeps the prompt cache warm by bypassing the combo
|
|
* strategy — but if the pinned provider is dead (credits exhausted / banned /
|
|
* expired, circuit-open, repeated failures, or a long rate-limit) honoring the
|
|
* pin pounds a dead account forever with no failover (laila throttle + credits
|
|
* incidents, 2026-06-22). A brief transient cooldown is tolerated (pin kept) so
|
|
* an unstable provider does not churn the pin every turn. Connection-level
|
|
* `backoffLevel` already resets on success, so `backoffLevel >= K` ≈ K
|
|
* consecutive failures — no per-session counter needed.
|
|
*
|
|
* Returns true ⇒ drop the pin and use the strategy. Pure + unit-testable.
|
|
*/
|
|
export function pinIsDurablyUnhealthy(
|
|
circuitState: string | undefined,
|
|
connections: Array<{
|
|
testStatus?: string | null;
|
|
backoffLevel?: number | null;
|
|
rateLimitedUntil?: string | null;
|
|
}>,
|
|
now: number,
|
|
opts: { backoffLevel?: number; graceMs?: number } = {}
|
|
): boolean {
|
|
if (circuitState === "OPEN") return true;
|
|
if (!Array.isArray(connections) || connections.length === 0) return true;
|
|
const backoffThreshold = opts.backoffLevel ?? Number(process.env.PIN_DROP_BACKOFF_LEVEL || "2");
|
|
const graceMs = opts.graceMs ?? Number(process.env.PIN_DROP_GRACE_MS || "20000");
|
|
// The pin survives as long as AT LEAST ONE connection is healthy or only
|
|
// briefly cooling down — failover only when every connection is durably down.
|
|
const anyUsable = connections.some((c) => {
|
|
const status = typeof c.testStatus === "string" ? c.testStatus : "";
|
|
if (TERMINAL_PIN_STATUSES.has(status)) return false;
|
|
if (Number(c.backoffLevel ?? 0) >= backoffThreshold) return false;
|
|
const rl = c.rateLimitedUntil ? new Date(String(c.rateLimitedUntil)).getTime() : 0;
|
|
if (Number.isFinite(rl) && rl - now > graceMs) return false;
|
|
return true;
|
|
});
|
|
return !anyUsable;
|
|
}
|
|
|
|
/**
|
|
* Async wrapper: resolve the pinned model's provider, read its circuit state and
|
|
* active connections, and decide via {@link pinIsDurablyUnhealthy}. Fail-open
|
|
* (return false) on any error so a lookup bug never drops a healthy pin.
|
|
*/
|
|
async function isPinnedModelDurablyUnhealthy(pinnedModel: string): Promise<boolean> {
|
|
try {
|
|
const provider = parseModel(pinnedModel).provider;
|
|
if (!provider) return false;
|
|
const circuitState = getCircuitBreaker(provider)?.getStatus?.()?.state;
|
|
const connections = (await getProviderConnections({
|
|
provider,
|
|
isActive: true,
|
|
})) as Array<{
|
|
testStatus?: string | null;
|
|
backoffLevel?: number | null;
|
|
rateLimitedUntil?: string | null;
|
|
}>;
|
|
return pinIsDurablyUnhealthy(circuitState, connections || [], Date.now());
|
|
} catch {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Handle combo chat with fallback.
|
|
* @param {Object} options
|
|
* @param {Object} options.body - Request body
|
|
* @param {Object} options.combo - Full combo object { name, models, strategy, config }
|
|
* @param {Function} options.handleSingleModel - Function: (body, modelStr) => Promise<Response>
|
|
* @param {Function} [options.isModelAvailable] - Optional pre-check: (modelStr) => Promise<boolean>
|
|
* @param {Object} options.log - Logger object
|
|
* @returns {Promise<Response>}
|
|
*/
|
|
// #2101 guard helpers: a 400 caused by context overflow or parameter validation
|
|
// is NOT body-specific — different combo targets have different context windows /
|
|
// output limits, so the request should fall through to the next target instead of
|
|
// being short-circuited. Exported as pure predicates so the guard is unit-testable.
|
|
/** @param {string} errorText */
|
|
export function isContextOverflow400(errorText) {
|
|
return (
|
|
/\bcontext.*(?:length_exceeded|too long|overflow|exceeded|window|limit)\b/i.test(errorText) ||
|
|
/exceeds.*context/i.test(errorText) ||
|
|
/your input exceeds/i.test(errorText)
|
|
);
|
|
}
|
|
/** @param {string} errorText */
|
|
export function isParamValidation400(errorText) {
|
|
return (
|
|
/\bmax_tokens\b.*(?:illegal|must|range|invalid)/i.test(errorText) ||
|
|
/\bparameter is illegal\b/i.test(errorText) ||
|
|
/\bis illegal.*range\b/i.test(errorText)
|
|
);
|
|
}
|
|
|
|
/** @param {object} options */
|
|
export async function handleComboChat({
|
|
body,
|
|
combo,
|
|
handleSingleModel,
|
|
isModelAvailable,
|
|
log,
|
|
settings,
|
|
allCombos,
|
|
relayOptions,
|
|
signal,
|
|
apiKeyAllowedConnections = null,
|
|
nesting = null,
|
|
}: HandleComboChatOptions): Promise<Response> {
|
|
const comboCtx = createComboContext({ body, combo, settings, relayOptions, log });
|
|
const {
|
|
strategy,
|
|
relayConfig,
|
|
resilienceSettings,
|
|
universalHandoffConfig,
|
|
effectiveSessionId,
|
|
pinnedModel,
|
|
clientRequestedStream,
|
|
config,
|
|
comboTargetTimeoutMs,
|
|
reasoningTokenBufferEnabled,
|
|
} = phaseComboSetup(comboCtx);
|
|
body = comboCtx.body;
|
|
|
|
const handleSingleModelWithTimeout = buildTargetTimeoutRunner({
|
|
handleSingleModel,
|
|
comboTargetTimeoutMs,
|
|
log,
|
|
});
|
|
|
|
// Route to pinned model if context caching specifies one (Fix #679)
|
|
if (pinnedModel) {
|
|
// The pin is read from session_model_history (a PRIOR turn) and may name a
|
|
// model that has since been removed from this combo, or a provider whose
|
|
// credentials are gone. Without this guard a stale pin bypasses the strategy
|
|
// and routes to a dead model forever — incident 2026-06-21: cli-claude-heavy
|
|
// pinned to a deepseek connection with no active credentials → instant fail,
|
|
// never falling through to the live targets; and combos re-pointed Opus→Sonnet
|
|
// kept serving the old model. Validate the pin is still reachable in THIS
|
|
// combo's resolved targets (refs flattened) before honoring it. Only validate
|
|
// when allCombos is authoritative (non-empty) so we can resolve combo-refs;
|
|
// the auto-combo redirect path passes an empty list and keeps prior behavior.
|
|
const haveFullCombos = Array.isArray(allCombos) ? allCombos.length > 0 : !!allCombos;
|
|
const pinInCombo =
|
|
!haveFullCombos ||
|
|
resolveComboTargets(combo, allCombos, clampComboDepth(config.maxComboDepth)).some(
|
|
(t) => t.modelStr === pinnedModel
|
|
);
|
|
// Honor the pin only if it is still a combo target AND its provider is not
|
|
// DURABLY down. Without the health gate a pin keeps routing a session to a
|
|
// dead/credits-exhausted/throttled account forever (strategy bypassed, no
|
|
// failover) — incident 2026-06-22: laila stuck on a throttled claude account
|
|
// and credits_exhausted accounts never failing over. A transient cooldown is
|
|
// tolerated (pin kept) so an unstable provider does not churn the pin.
|
|
const pinDurablyDown = pinInCombo ? await isPinnedModelDurablyUnhealthy(pinnedModel) : false;
|
|
if (pinInCombo && !pinDurablyDown) {
|
|
log.info(
|
|
"COMBO",
|
|
`Bypassing strategy — routing directly to pinned context model: ${pinnedModel}`
|
|
);
|
|
let pinnedResult: Response | null = null;
|
|
try {
|
|
pinnedResult = await handleSingleModelWithTimeout(body, pinnedModel, {
|
|
modelPinned: true,
|
|
} as SingleModelTarget);
|
|
} catch (pinErr) {
|
|
log.warn(
|
|
"COMBO",
|
|
`Pinned model ${pinnedModel} threw error: ${pinErr instanceof Error ? pinErr.message : String(pinErr)}, falling through to combo retry/fallback`
|
|
);
|
|
}
|
|
if (pinnedResult) {
|
|
if (pinnedResult.ok) {
|
|
let pinnedClone: Response;
|
|
try {
|
|
pinnedClone = pinnedResult.clone();
|
|
} catch {
|
|
pinnedClone = pinnedResult;
|
|
}
|
|
const pinnedQuality = await validateResponseQuality(
|
|
pinnedClone,
|
|
clientRequestedStream,
|
|
log,
|
|
config.responseValidation
|
|
);
|
|
releaseQualityClone(pinnedClone, pinnedResult, pinnedQuality);
|
|
if (pinnedQuality.valid) return pinnedResult;
|
|
log.warn(
|
|
"COMBO",
|
|
`Pinned model ${pinnedModel} returned 200 but failed quality check: ${pinnedQuality.reason}, falling through to combo retry/fallback`
|
|
);
|
|
} else {
|
|
const pinnedStatus = pinnedResult.status || 500;
|
|
if (![408, 429, 500, 502, 503, 504].includes(pinnedStatus)) {
|
|
return pinnedResult;
|
|
}
|
|
log.warn(
|
|
"COMBO",
|
|
`Pinned model ${pinnedModel} failed (${pinnedStatus}), falling through to combo retry/fallback`
|
|
);
|
|
}
|
|
}
|
|
// Fall through to the target iteration loop below — retries and sibling
|
|
// models will be tried via the normal combo machinery.
|
|
}
|
|
log.warn(
|
|
"COMBO",
|
|
pinInCombo
|
|
? `Context-cache pin "${pinnedModel}" provider durably unhealthy — dropping pin, using strategy`
|
|
: `Stale context-cache pin "${pinnedModel}" not in combo "${combo.name}" targets — dropping pin, using strategy`
|
|
);
|
|
// Fall through to the normal target iteration loop below — the pin is
|
|
// dropped, so the combo strategy picks the best available target.
|
|
}
|
|
|
|
// Fusion strategy: parallel panel + judge synthesis. Handled in a separate module
|
|
// because it neither iterates targets in order nor needs the failover/retry/credential
|
|
// gate machinery that follows — it fans out, then synthesizes once.
|
|
if (strategy === "fusion") {
|
|
const fusionModels = (combo.models || [])
|
|
.map((m) => {
|
|
if (typeof m === "string") return m;
|
|
if (m && typeof m === "object") {
|
|
const obj = m as Record<string, unknown>;
|
|
if (typeof obj.model === "string") return obj.model;
|
|
}
|
|
return null;
|
|
})
|
|
.filter((m): m is string => Boolean(m));
|
|
const cfg = config as Record<string, unknown>;
|
|
const judgeModel = typeof cfg.judgeModel === "string" ? cfg.judgeModel : undefined;
|
|
const tuning =
|
|
cfg.fusionTuning && typeof cfg.fusionTuning === "object"
|
|
? (cfg.fusionTuning as FusionTuning)
|
|
: undefined;
|
|
return handleFusionChat({
|
|
body,
|
|
models: fusionModels,
|
|
handleSingleModel: handleSingleModelWithTimeout,
|
|
log,
|
|
comboName: combo.name,
|
|
judgeModel,
|
|
tuning,
|
|
});
|
|
}
|
|
|
|
// Pipeline strategy: sequential chain — each step's output feeds the next step's
|
|
// input, only the final step's response is returned. Handled in a separate module
|
|
// because it neither iterates targets as fallbacks nor needs the failover/retry
|
|
// machinery below — it runs targets in order, threading output → input. The step
|
|
// list is `combo.models` (in order); an optional per-step `prompt` is read off the
|
|
// target object (comboModelStepInputSchema.prompt).
|
|
if (strategy === "pipeline") {
|
|
const pipelineSteps = (combo.models || [])
|
|
.map((m): PipelineStep | null => {
|
|
if (typeof m === "string") return { model: m };
|
|
if (m && typeof m === "object") {
|
|
const obj = m as Record<string, unknown>;
|
|
if (typeof obj.model === "string") {
|
|
return {
|
|
model: obj.model,
|
|
prompt: typeof obj.prompt === "string" ? obj.prompt : undefined,
|
|
};
|
|
}
|
|
}
|
|
return null;
|
|
})
|
|
.filter((s): s is PipelineStep => Boolean(s));
|
|
return handlePipelineChat({
|
|
body,
|
|
steps: pipelineSteps,
|
|
handleSingleModel: handleSingleModelWithTimeout,
|
|
log,
|
|
comboName: combo.name,
|
|
});
|
|
}
|
|
|
|
const nestingContext = nesting || {
|
|
depth: 0,
|
|
maxDepth: clampComboDepth(config.maxComboDepth),
|
|
visitedComboNames: [combo.name],
|
|
rootComboName: combo.name,
|
|
attemptBudget: { count: 0, limit: MAX_GLOBAL_ATTEMPTS },
|
|
};
|
|
const nestedComboMode = normalizeNestedComboMode(config.nestedComboMode);
|
|
|
|
const executeModeUnits =
|
|
nestedComboMode === "execute" && allCombos
|
|
? resolveComboRuntimeUnits(combo, allCombos, "execute", nestingContext.maxDepth)
|
|
: [];
|
|
const hasExecutableComboRef = executeModeUnits.some((unit) => unit.kind === "combo-ref");
|
|
const simpleExecuteStrategies = new Set([
|
|
"priority",
|
|
"round-robin",
|
|
"random",
|
|
"strict-random",
|
|
"weighted",
|
|
"fill-first",
|
|
]);
|
|
|
|
if (hasExecutableComboRef && simpleExecuteStrategies.has(strategy)) {
|
|
let runtimeUnits = executeModeUnits;
|
|
let unitExecutionStrategy = strategy;
|
|
if (strategy === "weighted") {
|
|
const stickyLimit = clampStickyWeightedTargetLimit(
|
|
(config as Record<string, unknown>).stickyWeightedLimit
|
|
);
|
|
const stickyKey = getStickyWeightedExecutionKey(combo.name, stickyLimit);
|
|
const stickyUnit = stickyKey
|
|
? runtimeUnits.find((unit) => unit.executionKey === stickyKey)
|
|
: null;
|
|
if (stickyUnit) {
|
|
runtimeUnits = [
|
|
stickyUnit,
|
|
...runtimeUnits.filter((unit) => unit.executionKey !== stickyUnit.executionKey),
|
|
];
|
|
unitExecutionStrategy = "priority";
|
|
}
|
|
}
|
|
if (strategy === "random") runtimeUnits = fisherYatesShuffle([...runtimeUnits]);
|
|
if (strategy === "strict-random") {
|
|
const key = await getNextFromDeck(
|
|
`combo:${combo.name}`,
|
|
runtimeUnits.map((unit) => unit.executionKey)
|
|
);
|
|
const selected = runtimeUnits.find((unit) => unit.executionKey === key) || runtimeUnits[0];
|
|
runtimeUnits = [
|
|
selected,
|
|
...runtimeUnits.filter((unit) => unit.executionKey !== selected.executionKey),
|
|
];
|
|
}
|
|
let runtimeStickyLimit: number | null = null;
|
|
let runtimeStickyTargets: ResolvedComboUnit[] = runtimeUnits;
|
|
if (strategy === "round-robin") {
|
|
const perComboStickyLimit = (config as Record<string, unknown>).stickyRoundRobinLimit;
|
|
runtimeStickyLimit = clampStickyRoundRobinTargetLimit(
|
|
perComboStickyLimit !== undefined && perComboStickyLimit !== null
|
|
? perComboStickyLimit
|
|
: (settings as Record<string, unknown> | null)?.stickyRoundRobinLimit
|
|
);
|
|
const { startIndex, counter } = getStickyRoundRobinStartIndex(
|
|
combo.name,
|
|
runtimeUnits,
|
|
runtimeStickyLimit
|
|
);
|
|
if (runtimeStickyLimit <= 1) rrCounters.set(combo.name, counter + 1);
|
|
runtimeUnits = runtimeUnits.map(
|
|
(_, offset) => runtimeUnits[(startIndex + offset) % runtimeUnits.length]
|
|
);
|
|
runtimeStickyTargets = executeModeUnits;
|
|
}
|
|
const execution = await executeRuntimeUnitCombo({
|
|
body,
|
|
combo,
|
|
strategy: unitExecutionStrategy,
|
|
effectiveComboStrategy: strategy,
|
|
units: runtimeUnits,
|
|
handleSingleModel: handleSingleModelWithTimeout,
|
|
isModelAvailable,
|
|
log,
|
|
config,
|
|
settings,
|
|
allCombos,
|
|
signal,
|
|
nesting: nestingContext,
|
|
baseOptions: {
|
|
body,
|
|
combo,
|
|
handleSingleModel,
|
|
isModelAvailable,
|
|
log,
|
|
settings,
|
|
allCombos,
|
|
relayOptions,
|
|
signal,
|
|
apiKeyAllowedConnections,
|
|
},
|
|
runCombo: handleComboChat,
|
|
});
|
|
if (strategy === "weighted" && execution.response.ok && execution.unit) {
|
|
const stickyLimit = clampStickyWeightedTargetLimit(
|
|
(config as Record<string, unknown>).stickyWeightedLimit
|
|
);
|
|
if (stickyLimit > 1)
|
|
recordStickyWeightedSuccess(combo.name, execution.unit.executionKey, stickyLimit);
|
|
}
|
|
if (
|
|
strategy === "round-robin" &&
|
|
execution.response.ok &&
|
|
execution.unit &&
|
|
runtimeStickyLimit &&
|
|
runtimeStickyLimit > 1
|
|
) {
|
|
recordStickyRoundRobinSuccess(
|
|
combo.name,
|
|
execution.unit,
|
|
runtimeStickyLimit,
|
|
runtimeStickyTargets
|
|
);
|
|
}
|
|
return execution.response;
|
|
}
|
|
|
|
// 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);
|
|
|
|
const isTargetSelectableForWeighted = async (target: ResolvedComboTarget): Promise<boolean> => {
|
|
const rawModel = parseModel(target.modelStr).model || target.modelStr;
|
|
if (target.provider && getCircuitBreaker(target.provider).getStatus().state === "OPEN")
|
|
return false;
|
|
if (
|
|
resilienceSettings.providerCooldown.enabled &&
|
|
Boolean(target.provider && target.provider !== "unknown") &&
|
|
isProviderInCooldown(target.provider, target.connectionId ?? undefined, resilienceSettings)
|
|
) {
|
|
return false;
|
|
}
|
|
if (
|
|
target.provider &&
|
|
rawModel &&
|
|
isModelLocked(target.provider, target.connectionId || "", rawModel)
|
|
) {
|
|
return false;
|
|
}
|
|
return isModelAvailable ? await isModelAvailable(target.modelStr, target) : true;
|
|
};
|
|
|
|
// #2562: Expand provider-wildcard steps (e.g. `fta/*`, `openai/gpt-4*`) into
|
|
// concrete model entries sourced from the live synced-models catalog + registry.
|
|
// Must run before any step-group / target resolution so that wildcard-originated
|
|
// steps are treated identically to hand-authored entries by all downstream logic
|
|
// (including the sticky-weighted eligibility pass below).
|
|
const expandedCombo = await expandProviderWildcardsInCombo(combo);
|
|
const expandedAllCombos = allCombos
|
|
? Array.isArray(allCombos)
|
|
? await expandProviderWildcardsInCollection(allCombos as ComboLike[])
|
|
: {
|
|
...allCombos,
|
|
combos: await expandProviderWildcardsInCollection(
|
|
((allCombos as { combos?: ComboLike[] }).combos || []) as ComboLike[]
|
|
),
|
|
}
|
|
: allCombos;
|
|
|
|
const stickyWeightedLimit = clampStickyWeightedTargetLimit(
|
|
(config as Record<string, unknown>).stickyWeightedLimit
|
|
);
|
|
if (
|
|
strategy === "weighted" &&
|
|
!weightedStickyTargets.has(combo.name) &&
|
|
weightedStickyTargets.size >= MAX_RR_COUNTERS
|
|
) {
|
|
const oldest = weightedStickyTargets.keys().next().value;
|
|
if (oldest !== undefined) weightedStickyTargets.delete(oldest);
|
|
}
|
|
let stepGroups: Array<{ step: ComboRuntimeStep; targets: ResolvedComboTarget[] }> | undefined;
|
|
const weightedEligibleKeys = new Set<string>();
|
|
if (strategy === "weighted") {
|
|
stepGroups = resolveWeightedStepGroups(expandedCombo, expandedAllCombos);
|
|
for (const group of stepGroups) {
|
|
const availability = await Promise.all(group.targets.map(isTargetSelectableForWeighted));
|
|
if (availability.some(Boolean)) weightedEligibleKeys.add(group.step.executionKey);
|
|
}
|
|
}
|
|
const rawStickyWeightedKey =
|
|
strategy === "weighted" ? getStickyWeightedExecutionKey(combo.name, stickyWeightedLimit) : null;
|
|
const stickyWeightedKey =
|
|
rawStickyWeightedKey && weightedEligibleKeys.has(rawStickyWeightedKey)
|
|
? rawStickyWeightedKey
|
|
: null;
|
|
if (strategy !== "weighted" || stickyWeightedLimit <= 1) {
|
|
weightedStickyTargets.delete(combo.name);
|
|
} else if (rawStickyWeightedKey && !stickyWeightedKey) {
|
|
weightedStickyTargets.delete(combo.name);
|
|
}
|
|
const weightedResolution =
|
|
strategy === "weighted"
|
|
? resolveWeightedTargets(
|
|
expandedCombo,
|
|
expandedAllCombos,
|
|
stickyWeightedKey,
|
|
weightedEligibleKeys,
|
|
stepGroups
|
|
)
|
|
: null;
|
|
const getWeightedStepKeyForTarget = (target: ResolvedComboTarget): string | null => {
|
|
if (!weightedResolution?.orderedSteps) return null;
|
|
const step = weightedResolution.orderedSteps.find(
|
|
(entry) =>
|
|
target.executionKey === entry.executionKey ||
|
|
target.executionKey.startsWith(entry.executionKey + ">")
|
|
);
|
|
return step?.executionKey || null;
|
|
};
|
|
let orderedTargets =
|
|
strategy === "weighted"
|
|
? weightedResolution?.orderedTargets || []
|
|
: resolveComboTargets(
|
|
expandedCombo,
|
|
expandedAllCombos,
|
|
clampComboDepth(config.maxComboDepth)
|
|
);
|
|
|
|
orderedTargets = await applyRequestTagRouting(orderedTargets, body, log);
|
|
|
|
if (strategy === "weighted") {
|
|
log.info(
|
|
"COMBO",
|
|
`Weighted selection${stickyWeightedKey ? " (sticky)" : ""}${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,
|
|
});
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// #4945 regression guard: when an "auto" combo uses an EXPLICIT router
|
|
// (routingStrategy lkgp/cost/etc, not the default "rules" scorer), that router
|
|
// pins orderedTargets[0]. The task-aware reordering below must then refine only
|
|
// the fallback order, never override the router's primary choice.
|
|
let autoUsedExplicitRouter = false;
|
|
if (strategy === "auto") {
|
|
const autoResult = await resolveAutoStrategyOrder({
|
|
orderedTargets,
|
|
body,
|
|
combo,
|
|
settings,
|
|
config,
|
|
relayOptions,
|
|
resilienceSettings,
|
|
log,
|
|
buildAutoCandidates,
|
|
});
|
|
if ("earlyResponse" in autoResult) return autoResult.earlyResponse;
|
|
orderedTargets = autoResult.orderedTargets;
|
|
autoUsedExplicitRouter = autoResult.autoUsedExplicitRouter;
|
|
} else {
|
|
orderedTargets = await applyStrategyOrdering(strategy, orderedTargets, {
|
|
combo,
|
|
config,
|
|
body,
|
|
log,
|
|
apiKeyAllowedConnections,
|
|
});
|
|
}
|
|
// #6168: session stickiness opt-out. Per-combo `config.disableSessionStickiness`
|
|
// overrides the global `settings.disableSessionStickiness` fallback (default false,
|
|
// preserving the #3825 prompt-cache/504 fix). When disabled, skip the reorder and
|
|
// treat the result as a no-op so the recordStickyBinding write-back below is skipped.
|
|
const disableSessionStickiness = resolveDisableSessionStickiness(
|
|
config as Record<string, unknown> | null | undefined,
|
|
settings as Record<string, unknown> | null | undefined
|
|
);
|
|
const _sticky = disableSessionStickiness
|
|
? ({ targets: orderedTargets, messageHash: null, stuck: false } as const)
|
|
: await applySessionStickiness(
|
|
orderedTargets,
|
|
body.messages as Array<{ role?: string; content?: unknown }>
|
|
);
|
|
orderedTargets = _sticky.targets;
|
|
orderedTargets = orderTargetsByEvalScores(orderedTargets, config.evalRouting, log);
|
|
orderedTargets = filterTargetsByRequestCompatibility(orderedTargets, body, log);
|
|
|
|
// Task-aware reordering: only active for strategies ["smart","task","task-aware","task_aware","auto"].
|
|
// Additive — does not affect any of the other 15 strategies.
|
|
if (isTaskRoutingStrategy(strategy)) {
|
|
const task = classifyTask(body);
|
|
const conversationCacheKey = getConversationCacheKey(body);
|
|
const taskReordered = reorderByTaskWeight(orderedTargets, task);
|
|
// #4945 regression guard: when an explicit auto router (lkgp/cost/…) pinned
|
|
// orderedTargets[0], keep that primary choice and let task-aware refine only
|
|
// the fallback tail — otherwise task weighting silently defeats the operator's
|
|
// chosen LKGP/cost selection. reorderByTaskWeight returns the same target
|
|
// objects (no clone), so identity filtering is safe.
|
|
const pinnedFirst = autoUsedExplicitRouter ? orderedTargets[0] : undefined;
|
|
const nextOrder = pinnedFirst
|
|
? [pinnedFirst, ...taskReordered.filter((t) => t !== pinnedFirst)]
|
|
: taskReordered;
|
|
if (nextOrder[0]?.modelStr !== orderedTargets[0]?.modelStr) {
|
|
const reasons =
|
|
Array.isArray(task.reasons) && task.reasons.length > 0
|
|
? ` (${task.reasons.join(",")})`
|
|
: "";
|
|
log.info(
|
|
"COMBO",
|
|
`task-route task=${task.level}${reasons} cacheKey=${conversationCacheKey ?? "none"} → ${nextOrder[0]?.modelStr}`
|
|
);
|
|
}
|
|
orderedTargets = nextOrder;
|
|
}
|
|
|
|
// 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>();
|
|
|
|
// #5923 (Finding #4) — reset-window config for the shared per-target quota-
|
|
// exhaustion cutoff below. The "auto" strategy already applies its own cutoff
|
|
// via buildAutoCandidates/routableCandidates, so this only affects the other
|
|
// 16 strategies (priority, weighted, etc.) that funnel through executeTarget.
|
|
const quotaCutoffResetWindowConfig = resolveResetWindowConfig(config as Record<string, unknown>);
|
|
|
|
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;
|
|
|
|
// Quota-share cooldown-aware retry (Variante A). Only quota-share (qtSd/)
|
|
// combos opt in: when the set loop would crystallize a 429 model_cooldown
|
|
// because the target hit a SHORT transient cooldown, we wait it out and
|
|
// re-run the whole set loop instead of propagating the 429. `globalAttempts`
|
|
// persists across these waits so MAX_GLOBAL_ATTEMPTS still bounds total work.
|
|
// The wait happens at the crystallization point. The only semaphore slot the
|
|
// quota-share path may hold is the FASE 2.1 per-connection concurrency slot
|
|
// (acquired once around dispatchWithCooldownRetry below); it is intentionally
|
|
// kept across the wait so the account stays "busy", and is released by the
|
|
// outer finally — not here.
|
|
//
|
|
// The set loop is wrapped in a small recursive closure rather than an extra
|
|
// labelled `while (true)` so the loop body keeps its original indentation; a
|
|
// wait+redispatch is a tail `return dispatchWithCooldownRetry()`, which
|
|
// re-runs ONLY the set loop (selection / shadow routing / setup above stay
|
|
// untouched), preserving the pre-existing `continue`-to-top-of-set-loop
|
|
// semantics exactly.
|
|
const comboCooldownWaitEnabled =
|
|
strategy === "quota-share" && resilienceSettings.comboCooldownWait.enabled;
|
|
let comboCooldownAttempt = 0;
|
|
let comboCooldownBudgetLeftMs = resilienceSettings.comboCooldownWait.budgetMs;
|
|
|
|
// FASE 2.1: per-connection concurrency limit for quota-share. The gating in
|
|
// selectQuotaShareTarget is fail-open and cannot hard-limit a single-connection
|
|
// pool, so we serialize concurrent requests to the selected account through a
|
|
// per-connection semaphore. Enabled only for quota-share combos (the cap is the
|
|
// account's) and gated by the kill-switch; the slot wraps the whole dispatch.
|
|
const quotaShareConcurrencyEnabled =
|
|
strategy === "quota-share" && resilienceSettings.quotaShareConcurrencyLimit.enabled;
|
|
|
|
const dispatchWithCooldownRetry = async (): Promise<Response> => {
|
|
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 };
|
|
|
|
// #1731 / #1731v2: skip targets already known-exhausted this request (shared predicate).
|
|
const exhaustedSkip = getExhaustedTargetSkipReason(
|
|
target,
|
|
exhaustedProviders,
|
|
exhaustedConnections
|
|
);
|
|
if (exhaustedSkip) {
|
|
log.info("COMBO", exhaustedSkip);
|
|
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;
|
|
}
|
|
|
|
// #5923 (Finding #4) — honor the same opt-in quota-exhaustion cutoff the
|
|
// "auto" strategy already applies (buildAutoCandidates), for every other
|
|
// strategy (priority, weighted, etc.). Strictly scoped per (provider,
|
|
// connectionId): a 0%-remaining connection is skipped here, but sibling
|
|
// connections/models on the same provider are untouched — the provider
|
|
// circuit breaker is never touched by this check. The "auto" strategy is
|
|
// excluded to avoid a redundant duplicate fetch — it already filtered its
|
|
// candidate pool via `routableCandidates` before reaching this loop.
|
|
if (strategy !== "auto" && provider && target.connectionId) {
|
|
const quotaCutoff = await resolveQuotaExhaustionCutoffForTarget(
|
|
provider,
|
|
target.connectionId,
|
|
resilienceSettings,
|
|
quotaCutoffResetWindowConfig,
|
|
combo.name,
|
|
log
|
|
);
|
|
if (quotaCutoff.blocked) {
|
|
log.info(
|
|
"COMBO",
|
|
`Skipping ${modelStr} — quota exhaustion cutoff (${quotaCutoff.reason || "quota_exhausted"})`
|
|
);
|
|
if (i > 0) fallbackCount++;
|
|
return null;
|
|
}
|
|
}
|
|
|
|
// Pre-screen snapshot is NOT used as a permanent skip — availability
|
|
// is always re-checked via isModelAvailable below because connection
|
|
// cooldowns can expire between setTry retries, making a previously
|
|
// unavailable target available again. Circuit-breaker-OPEN providers
|
|
// are already caught by the dedicated breaker check above.
|
|
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 ${retry})` : ""}`
|
|
);
|
|
emit("combo.target.attempt", {
|
|
comboName: combo.name,
|
|
targetIndex: i,
|
|
provider,
|
|
model: modelStr,
|
|
timestamp: Date.now(),
|
|
strategy,
|
|
});
|
|
|
|
// Deep clone the body to ensure context preservation and prevent mutations
|
|
// from affecting other targets in the combo. structuredClone avoids the
|
|
// full intermediate JSON string that JSON.parse(JSON.stringify(...)) builds
|
|
// (a second multi-hundred-KB allocation per target on large agent payloads),
|
|
// halving the per-target transient heap on the hot path (#5152).
|
|
let attemptBody = structuredClone(body);
|
|
|
|
// Proactive Context Compression for fallbacks (Zero-Latency optimization)
|
|
if (
|
|
zeroLatencyOptimizationsEnabled &&
|
|
i > 0 &&
|
|
config.fallbackCompressionMode &&
|
|
config.fallbackCompressionMode !== "off"
|
|
) {
|
|
const { estimateTokens } = await import("./contextManager.ts");
|
|
const estimatedTokens = estimateTokens(JSON.stringify(attemptBody));
|
|
if (estimatedTokens > (config.fallbackCompressionThreshold ?? 1000)) {
|
|
const { applyCompression } = await import("./compression/strategySelector.ts");
|
|
const compressionResult = applyCompression(
|
|
attemptBody,
|
|
config.fallbackCompressionMode as CompressionMode,
|
|
// Opt into the TV1 bail-out so a throwing fallback engine is SKIPPED rather than
|
|
// propagating out of executeTarget and being swallowed as a "Speculative task
|
|
// error" (which silently drops this combo target). minGainPercent:0 keeps the
|
|
// advance behavior identical to the default path — this only adds skip-on-throw.
|
|
{ model: modelStr, bailout: { enabled: true, minGainPercent: 0 } }
|
|
);
|
|
if (compressionResult.compressed) {
|
|
log.info(
|
|
"COMBO",
|
|
`Proactive fallback compression applied (${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,
|
|
effectiveComboStrategy: strategy,
|
|
failoverBeforeRetry: config.failoverBeforeRetry,
|
|
});
|
|
|
|
// Success — validate response quality before returning
|
|
if (result.ok) {
|
|
const selectedConnectionId =
|
|
result.headers?.get("X-OmniRoute-Selected-Connection-Id") ||
|
|
result.headers?.get("x-omniroute-selected-connection-id") ||
|
|
undefined;
|
|
const effectiveConnectionId = selectedConnectionId || target.connectionId || "";
|
|
|
|
// Clone BEFORE quality check — validateResponseQuality reads the body
|
|
// via getReader() which locks the stream. The clone's body is consumed
|
|
// by the quality check; the original stays unlocked for piping.
|
|
let qualityClone: Response;
|
|
try {
|
|
qualityClone = result.clone();
|
|
} catch {
|
|
qualityClone = result;
|
|
}
|
|
const quality = await validateResponseQuality(
|
|
qualityClone,
|
|
clientRequestedStream,
|
|
log,
|
|
config.responseValidation
|
|
);
|
|
releaseQualityClone(qualityClone, result, quality);
|
|
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,
|
|
maxCooldownMs: mlSettings.maxCooldownMs,
|
|
}
|
|
);
|
|
}
|
|
}
|
|
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, effectiveConnectionId, 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, effectiveConnectionId || undefined);
|
|
}
|
|
if (strategy === "weighted" && stickyWeightedLimit > 1) {
|
|
const stickySuccessKey = getWeightedStepKeyForTarget(target);
|
|
if (stickySuccessKey) {
|
|
recordStickyWeightedSuccess(combo.name, stickySuccessKey, stickyWeightedLimit);
|
|
}
|
|
}
|
|
// Webhook fan-out: best-effort, never blocks the response stream.
|
|
notifyWebhookEvent("request.completed", {
|
|
combo: combo.name,
|
|
provider,
|
|
model: modelStr,
|
|
account:
|
|
typeof target.label === "string" && target.label.trim().length > 0
|
|
? target.label.trim()
|
|
: "",
|
|
accountId: effectiveConnectionId ?? "",
|
|
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,
|
|
});
|
|
}
|
|
}
|
|
}
|
|
if (_sticky.messageHash && target.connectionId)
|
|
recordStickyBinding(_sticky.messageHash, target.connectionId); // LKGP (#919):
|
|
if (provider) {
|
|
const connId = effectiveConnectionId || 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: 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;
|
|
const selectedConnectionId =
|
|
result.headers?.get("X-OmniRoute-Selected-Connection-Id") ||
|
|
result.headers?.get("x-omniroute-selected-connection-id") ||
|
|
undefined;
|
|
const targetWithConnection = selectedConnectionId
|
|
? { ...target, connectionId: selectedConnectionId }
|
|
: target;
|
|
|
|
// #1731 / #1731v2: classify the upstream error and update the exhaustion sets
|
|
// (shared with handleRoundRobinCombo). Returns whether the provider is fully exhausted.
|
|
const providerExhausted = applyComboTargetExhaustion(targetWithConnection, {
|
|
result,
|
|
fallbackResult,
|
|
errorText,
|
|
rawModel,
|
|
isTokenLimitBreach,
|
|
allAccountsRateLimited: false,
|
|
sets: { exhaustedProviders, exhaustedConnections, transientRateLimitedProviders },
|
|
log,
|
|
tag: "COMBO",
|
|
exhaustedLogLevel: "info",
|
|
structuredError,
|
|
});
|
|
|
|
// #2101: Prevent infinite fallback loops with 400 Bad Request errors that are genuinely
|
|
// body-specific (malformed JSON, bad format, missing required fields).
|
|
// Context overflow and parameter validation errors are NOT body-specific:
|
|
// - Context overflow: different models have different context windows
|
|
// - Max_tokens / param errors: different models have different output limits
|
|
// - Model access denied: different providers serve different model sets
|
|
// These should fall through so the next combo target can try.
|
|
if (
|
|
result.status === 400 &&
|
|
fallbackResult.shouldFallback &&
|
|
!isContextOverflow400(errorText) &&
|
|
!isParamValidation400(errorText) &&
|
|
(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`);
|
|
// #4279: surface the 400 via the {ok,response} contract so the OUTER
|
|
// target loop resolves the combo and stops. A bare `break` here only
|
|
// exits the inner retry loop; executeTarget then returns null, which
|
|
// the outer loop treats as "this target produced nothing" and advances
|
|
// to the next model — so the guard failed to stop fallback and a combo
|
|
// of N body-rejecting targets tried all N. Mirrors the 499 path above.
|
|
return { ok: false, response: result };
|
|
}
|
|
|
|
// 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, targetWithConnection.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) {
|
|
if (
|
|
provider &&
|
|
rawModel &&
|
|
isModelLocked(provider, targetWithConnection.connectionId || "", rawModel)
|
|
) {
|
|
log.info("COMBO", `Skipping retry for ${modelStr} — model lockout active`);
|
|
if (i > 0) fallbackCount++;
|
|
return null;
|
|
}
|
|
// 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,
|
|
targetWithConnection.connectionId || "",
|
|
rawModel,
|
|
classifyLockoutReason(result.status),
|
|
result.status,
|
|
mlSettings.baseCooldownMs,
|
|
profile,
|
|
{
|
|
// #1308: honor a long upstream reset (e.g. "Resets in 160h") over
|
|
// the short base cooldown / exponential backoff when present.
|
|
exactCooldownMs: selectLockoutCooldownMs(cooldownMs, mlSettings),
|
|
maxCooldownMs: mlSettings.maxCooldownMs,
|
|
}
|
|
);
|
|
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,
|
|
targetWithConnection.connectionId || "",
|
|
rawModel,
|
|
classifyLockoutReason(result.status),
|
|
result.status,
|
|
mlSettings.baseCooldownMs,
|
|
profile,
|
|
{
|
|
// #1308: honor a long upstream reset over base/exponential cooldown.
|
|
exactCooldownMs: selectLockoutCooldownMs(cooldownMs, mlSettings),
|
|
maxCooldownMs: mlSettings.maxCooldownMs,
|
|
}
|
|
);
|
|
}
|
|
}
|
|
log.warn("COMBO", `Model ${modelStr} failed, trying next`, { status: result.status });
|
|
|
|
// #5976: per-model-quota providers (Gemini, GitHub, etc.) multiplex models
|
|
// behind one connection. A model-level 500 must NOT cool down the entire
|
|
// provider — sibling models may still succeed. Skip cooldown recording for
|
|
// these providers on 500 errors so the next target can try.
|
|
if (
|
|
resilienceSettings.providerCooldown.enabled &&
|
|
provider &&
|
|
provider !== "unknown" &&
|
|
!(result.status === 500 && hasPerModelQuota(provider, rawModel))
|
|
) {
|
|
recordProviderCooldown(
|
|
provider,
|
|
targetWithConnection.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) {
|
|
// Quota-share cooldown-aware retry: instead of crystallizing the 429,
|
|
// wait out a SHORT transient cooldown and re-run the whole set loop.
|
|
// Guarded by the helper (quota_exhausted/auth/not-found excluded,
|
|
// ceiling, attempts, budget). MAX_GLOBAL_ATTEMPTS still bounds total
|
|
// dispatches.
|
|
if (comboCooldownWaitEnabled && status === 429) {
|
|
const decision = resolveComboCooldownWaitDecision({
|
|
targets: orderedTargets,
|
|
earliestRetryAfter,
|
|
attempt: comboCooldownAttempt,
|
|
budgetLeftMs: comboCooldownBudgetLeftMs,
|
|
settings: resilienceSettings.comboCooldownWait,
|
|
lookupLock: (provider, connectionId) => {
|
|
const rawModel = parseModel(orderedTargets[0]?.modelStr ?? "").model || "";
|
|
return getModelLockoutInfo(provider, connectionId, rawModel);
|
|
},
|
|
computeWaitMs: (retryAfter) => computeClosestRetryAfter(retryAfter).waitMs,
|
|
});
|
|
if (decision.wait) {
|
|
log.info(
|
|
"COMBO",
|
|
`Quota-share cooldown wait: ${msg} — waiting ${Math.ceil(
|
|
decision.waitMs / 1000
|
|
)}s (reason=${decision.reason ?? "?"}) then retrying (attempt ${
|
|
comboCooldownAttempt + 1
|
|
}/${resilienceSettings.comboCooldownWait.maxAttempts})`
|
|
);
|
|
const completed = await waitForCooldownAwareRetry(decision.waitMs, signal);
|
|
if (!completed) {
|
|
log.info("COMBO", "Quota-share cooldown wait aborted by client disconnect");
|
|
return errorResponse(499, "Request aborted");
|
|
}
|
|
comboCooldownAttempt += 1;
|
|
comboCooldownBudgetLeftMs = Math.max(0, comboCooldownBudgetLeftMs - decision.waitMs);
|
|
return dispatchWithCooldownRetry();
|
|
}
|
|
}
|
|
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");
|
|
};
|
|
|
|
// FASE 2.1: acquire the per-connection concurrency slot for the selected
|
|
// quota-share target once, around the whole dispatch (including any
|
|
// cooldown-aware re-dispatch), so concurrent requests to one subscription
|
|
// account are serialized through the connection's max_concurrent ceiling. The
|
|
// cap is read fresh from the selected connection; a null cap (no limit) or a
|
|
// saturated queue is a no-op (fail-open). Released in the finally below.
|
|
let quotaShareConcurrencyRelease: (() => void) | null = null;
|
|
const qsConnectionId = orderedTargets[0]?.connectionId;
|
|
if (quotaShareConcurrencyEnabled && qsConnectionId) {
|
|
const qsCap = await lookupPositiveCap(qsConnectionId);
|
|
quotaShareConcurrencyRelease = await acquireQuotaShareConcurrencySlot(
|
|
orderedTargets[0],
|
|
qsCap,
|
|
{
|
|
queueTimeoutMs: config.queueTimeoutMs ?? 30000,
|
|
maxQueueSize: resolveComboQueueDepth(config),
|
|
},
|
|
log
|
|
);
|
|
}
|
|
|
|
try {
|
|
return await dispatchWithCooldownRetry();
|
|
} finally {
|
|
quotaShareConcurrencyRelease?.();
|
|
// 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;
|
|
// Honor each target connection's own maxConcurrent ceiling (cached per dispatch)
|
|
// so a low-concurrency subscription account is not flooded; falls back to the
|
|
// combo-level concurrency when the connection has no positive cap.
|
|
const resolveTargetConcurrency = makeConnectionConcurrencyResolver(concurrency);
|
|
const queueTimeout = config.queueTimeoutMs ?? 30000;
|
|
// #3872: pre-cascade queue depth — lower values fail over to the next combo member
|
|
// sooner under concurrency saturation (0 = never queue). Default 20 (backward-compat).
|
|
const queueDepth = resolveComboQueueDepth(config);
|
|
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);
|
|
|
|
// #2562: Expand provider-wildcard steps before resolving targets.
|
|
const rrExpandedCombo = await expandProviderWildcardsInCombo(combo);
|
|
const rrExpandedAllCombos = allCombos
|
|
? Array.isArray(allCombos)
|
|
? await expandProviderWildcardsInCollection(allCombos as ComboLike[])
|
|
: {
|
|
...allCombos,
|
|
combos: await expandProviderWildcardsInCollection(
|
|
((allCombos as { combos?: ComboLike[] }).combos || []) as ComboLike[]
|
|
),
|
|
}
|
|
: allCombos;
|
|
|
|
const orderedTargets = resolveComboTargets(
|
|
rrExpandedCombo,
|
|
rrExpandedAllCombos,
|
|
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"
|
|
);
|
|
// #6238: keep the targets the compat pre-filter rejected so they can serve as a
|
|
// last-resort fallback tier. The pre-filter drops request-incompatible targets
|
|
// BEFORE availability is known; if every compat-kept target then turns out to be
|
|
// runtime-unavailable, we must reconsider these before returning 503, instead of
|
|
// permanently dropping a compat-rejected-but-healthy provider.
|
|
const compatKeptSet = new Set(filteredTargets);
|
|
const compatRejectedTargets = evalRankedTargets.filter(
|
|
(target) => !compatKeptSet.has(target)
|
|
);
|
|
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. A per-combo `stickyRoundRobinLimit` (in
|
|
// combo.config, resolved through the cascade) overrides the global setting so one
|
|
// combo can batch differently from the default. When the per-combo value is unset,
|
|
// fall back to the global `stickyRoundRobinLimit` so the existing knob still controls
|
|
// sticky batching for both account fallback and combo targets. Values <= 1 preserve
|
|
// the historical one-request-per-target rotation.
|
|
const perComboStickyLimit = (config as Record<string, unknown>).stickyRoundRobinLimit;
|
|
const stickyLimit = clampStickyRoundRobinTargetLimit(
|
|
perComboStickyLimit !== undefined && perComboStickyLimit !== null
|
|
? perComboStickyLimit
|
|
: (settings as Record<string, unknown> | null)?.stickyRoundRobinLimit
|
|
);
|
|
const stickyRoundRobinEnabled = stickyLimit > 1;
|
|
// Exhaustion-aware sticky: if the currently sticky target is no longer
|
|
// available (circuit breaker OPEN, provider cooldown, model lockout, or
|
|
// isModelAvailable returns false), clear the sticky record so the rotation
|
|
// starts at the counter position instead of probing a dead target.
|
|
if (stickyRoundRobinEnabled) {
|
|
const sticky = rrStickyTargets.get(combo.name);
|
|
if (sticky) {
|
|
const stickyTarget = filteredTargets.find(
|
|
(target) => target.executionKey === sticky.executionKey
|
|
);
|
|
if (stickyTarget) {
|
|
const rawModel = parseModel(stickyTarget.modelStr).model || stickyTarget.modelStr;
|
|
const stickyAvailable =
|
|
(!stickyTarget.provider ||
|
|
getCircuitBreaker(stickyTarget.provider).getStatus().state !== "OPEN") &&
|
|
!(
|
|
resilienceSettings.providerCooldown.enabled &&
|
|
Boolean(stickyTarget.provider && stickyTarget.provider !== "unknown") &&
|
|
isProviderInCooldown(
|
|
stickyTarget.provider,
|
|
stickyTarget.connectionId ?? undefined,
|
|
resilienceSettings
|
|
)
|
|
) &&
|
|
!(
|
|
stickyTarget.provider &&
|
|
rawModel &&
|
|
isModelLocked(stickyTarget.provider, stickyTarget.connectionId || "", rawModel)
|
|
) &&
|
|
(isModelAvailable ? await isModelAvailable(stickyTarget.modelStr, stickyTarget) : true);
|
|
if (!stickyAvailable) {
|
|
log.info(
|
|
"COMBO-RR",
|
|
`Clearing stale sticky target ${stickyTarget.modelStr} — unavailable`
|
|
);
|
|
rrStickyTargets.delete(combo.name);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
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);
|
|
}
|
|
|
|
// #3825: per-conversation session stickiness for round-robin. weighted/priority honor a
|
|
// sticky connection via applySessionStickiness, but this RR handler returns before that
|
|
// call — so sessionless RR combos rotated every turn, busting the upstream prompt-cache.
|
|
// Reuse the SAME mechanism: start the rotation at the conversation's sticky connection
|
|
// (the loop still falls through to the other targets on failure → failover preserved).
|
|
// #6168: honor the session-stickiness opt-out here too, otherwise round-robin would
|
|
// still pin the conversation even when the flag is set. Per-combo `config` overrides
|
|
// the global `settings.disableSessionStickiness` fallback (default false).
|
|
const disableSessionStickiness = resolveDisableSessionStickiness(
|
|
config as Record<string, unknown> | null | undefined,
|
|
settings as Record<string, unknown> | null | undefined
|
|
);
|
|
const _rrSessionSticky = disableSessionStickiness
|
|
? ({ targets: filteredTargets, messageHash: null, stuck: false } as const)
|
|
: await applySessionStickiness(
|
|
filteredTargets,
|
|
body?.messages as Array<{ role?: string; content?: unknown }>
|
|
);
|
|
let rrStartIndex = startIndex;
|
|
if (_rrSessionSticky.stuck) {
|
|
const stickyIdx = filteredTargets.findIndex(
|
|
(t) => t.connectionId === _rrSessionSticky.targets[0]?.connectionId
|
|
);
|
|
if (stickyIdx >= 0) rrStartIndex = stickyIdx;
|
|
}
|
|
|
|
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 = (rrStartIndex + 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 / #1731v2: skip targets already known-exhausted this request (shared predicate).
|
|
const exhaustedSkip = getExhaustedTargetSkipReason(
|
|
target,
|
|
exhaustedProviders,
|
|
exhaustedConnections
|
|
);
|
|
if (exhaustedSkip) {
|
|
log.info("COMBO-RR", exhaustedSkip);
|
|
if (offset > 0) fallbackCount++;
|
|
continue;
|
|
}
|
|
|
|
// Acquire semaphore slot (may wait in queue). Honor the connection's own
|
|
// maxConcurrent cap when set; else fall back to the combo-level concurrency.
|
|
const targetConcurrency = await resolveTargetConcurrency(target.connectionId);
|
|
let release: () => void;
|
|
try {
|
|
release = await semaphore.acquire(semaphoreKey, {
|
|
maxConcurrency: targetConcurrency,
|
|
timeoutMs: queueTimeout,
|
|
maxQueueSize: queueDepth,
|
|
});
|
|
} 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} -> ${bufferedMaxTokens}`
|
|
);
|
|
}
|
|
}
|
|
|
|
const result = await handleSingleModel(attemptBody, modelStr, {
|
|
...targetForAttempt,
|
|
effectiveComboStrategy: "round-robin",
|
|
failoverBeforeRetry: config.failoverBeforeRetry,
|
|
});
|
|
|
|
// Success — validate response quality before returning
|
|
if (result.ok) {
|
|
let rrClone: Response;
|
|
try {
|
|
rrClone = result.clone();
|
|
} catch {
|
|
rrClone = result;
|
|
}
|
|
const quality = await validateResponseQuality(
|
|
rrClone,
|
|
clientRequestedStream,
|
|
log,
|
|
config.responseValidation
|
|
);
|
|
releaseQualityClone(rrClone, result, quality);
|
|
if (!quality.valid) {
|
|
log.warn(
|
|
"COMBO-RR",
|
|
`${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++;
|
|
|
|
const selectedConnectionId =
|
|
result.headers?.get("X-OmniRoute-Selected-Connection-Id") ||
|
|
result.headers?.get("x-omniroute-selected-connection-id") ||
|
|
undefined;
|
|
const effectiveConnectionId = selectedConnectionId || target.connectionId || "";
|
|
|
|
const rawModel = parseModel(modelStr).model || modelStr;
|
|
if (provider && rawModel) {
|
|
const dcResult = decayModelFailureCount(provider, effectiveConnectionId, rawModel);
|
|
if (dcResult.cleared) {
|
|
log.info("COMBO-RR", `Model ${modelStr} fully recovered — lockout cleared`);
|
|
} else if (dcResult.newFailureCount > 0) {
|
|
log.debug?.(
|
|
"COMBO-RR",
|
|
`Model ${modelStr} decayed to failureCount=${dcResult.newFailureCount}`
|
|
);
|
|
}
|
|
}
|
|
|
|
if (provider && provider !== "unknown") {
|
|
recordProviderSuccess(provider, effectiveConnectionId || undefined);
|
|
}
|
|
|
|
if (stickyRoundRobinEnabled) {
|
|
recordStickyRoundRobinSuccess(combo.name, target, stickyLimit, filteredTargets);
|
|
} else {
|
|
// #948: true round-robin (stickyLimit <= 1). The counter was advanced
|
|
// eagerly (+1 from the scheduled start index) before this loop ran, so
|
|
// when the scheduled model failed and a *different* model served via
|
|
// fallback, the next request reused the fallback-served model. Advance
|
|
// the pointer past the model that ACTUALLY served (modelIndex) instead,
|
|
// mirroring recordStickyRoundRobinSuccess's served-index logic. Read
|
|
// side applies `% modelCount`, so storing modelIndex + 1 is correct.
|
|
rrCounters.set(combo.name, modelIndex + 1);
|
|
}
|
|
|
|
// #3825: (re)record the sticky binding so the next turn re-pins (prompt-cache).
|
|
if (_rrSessionSticky.messageHash) {
|
|
const stickyConn = effectiveConnectionId || target.connectionId;
|
|
if (stickyConn) recordStickyBinding(_rrSessionSticky.messageHash, stickyConn);
|
|
}
|
|
|
|
if (provider) {
|
|
const connId = effectiveConnectionId || 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,
|
|
}
|
|
);
|
|
}
|
|
})();
|
|
}
|
|
// Clone is consumed by quality check; original stays unlocked.
|
|
return 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 selectedConnectionId =
|
|
result.headers?.get("X-OmniRoute-Selected-Connection-Id") ||
|
|
result.headers?.get("x-omniroute-selected-connection-id") ||
|
|
undefined;
|
|
const targetWithConnection = selectedConnectionId
|
|
? { ...target, connectionId: selectedConnectionId }
|
|
: target;
|
|
|
|
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.
|
|
// #1731 / #1731v2: classify the upstream error and update the exhaustion sets
|
|
// (shared with handleComboChat). Returns whether the provider is fully exhausted.
|
|
const providerExhausted = applyComboTargetExhaustion(targetWithConnection, {
|
|
result,
|
|
fallbackResult,
|
|
errorText,
|
|
rawModel: parseModel(modelStr).model || modelStr,
|
|
isTokenLimitBreach,
|
|
allAccountsRateLimited: isAllAccountsRateLimited,
|
|
sets: { exhaustedProviders, exhaustedConnections, transientRateLimitedProviders },
|
|
log,
|
|
tag: "COMBO-RR",
|
|
exhaustedLogLevel: "debug",
|
|
structuredError,
|
|
});
|
|
|
|
// 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" &&
|
|
!(result.status === 500 && hasPerModelQuota(provider, parseModel(modelStr).model || modelStr))
|
|
) {
|
|
recordProviderCooldown(
|
|
provider,
|
|
targetWithConnection.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;
|
|
|
|
// #6238: every compat-kept target was skipped as unavailable and NONE was ever
|
|
// attempted (recordedAttempts === 0). Before crystallizing 503, probe the targets
|
|
// the compat pre-filter rejected — a compat-rejected-but-healthy provider is a
|
|
// valid last-resort fallback tier, not a permanently dropped target.
|
|
if (recordedAttempts === 0 && compatRejectedTargets.length > 0) {
|
|
const compatFallbackResult = await attemptCompatRejectedFallback(compatRejectedTargets, body, {
|
|
handleSingleModel,
|
|
isModelAvailable,
|
|
isProviderInCooldown: (target) =>
|
|
resilienceSettings.providerCooldown.enabled &&
|
|
Boolean(target.provider && target.provider !== "unknown") &&
|
|
isProviderInCooldown(
|
|
target.provider as string,
|
|
target.connectionId as string | undefined,
|
|
resilienceSettings
|
|
),
|
|
log,
|
|
strategy: "round-robin",
|
|
});
|
|
if (compatFallbackResult) {
|
|
recordComboRequest(combo.name, null, {
|
|
success: true,
|
|
latencyMs: Date.now() - startTime,
|
|
fallbackCount,
|
|
strategy: "round-robin",
|
|
});
|
|
return compatFallbackResult;
|
|
}
|
|
}
|
|
|
|
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" },
|
|
});
|
|
}
|