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WalkthroughCentralized provider-selection and routing-candidate logic added to the chat handler, preferring DB-keyed providers in hybrid mode, removed certain region-token overrides for api-keys/hybrid flows, and added two hybrid-routing integration tests validating keyed-provider precedence and upstream token usage. ChangesHybrid routing tests
Routing / provider-selection refactor
Sequence Diagram(s)sequenceDiagram
participant Client
participant Gateway
participant DB as ProviderKeysDB
participant Metrics as RoutingMetrics
participant Keyed as KeyedProvider
participant Unkeyed as UnkeyedProvider
Client->>Gateway: POST /v1/chat/completions (model request)
Gateway->>DB: query providersWithKeys(project)
Gateway->>Metrics: fetch routing metrics (uptime/weights)
Gateway->>Gateway: getAvailableProvidersForProjectMode(...)
Gateway->>Gateway: preferProvidersWithKeys(...) (hybrid mode)
alt keyed provider chosen
Gateway->>Keyed: upstream generateContent (includes DB key / Authorization)
Keyed-->>Gateway: response (metadata.used_provider = Keyed)
else unkeyed/fallback chosen
Gateway->>Unkeyed: upstream generateContent (env token or credits path)
Unkeyed-->>Gateway: response (metadata.used_provider = Unkeyed)
end
Gateway-->>Client: response with metadata.used_provider
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| const preferredRoutingProviders = preferProvidersWithKeys( | ||
| project.mode, | ||
| contentFilterPreferredProviders, | ||
| providersWithKeys, |
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In hybrid mode this pre-filters contentFilterPreferredProviders down to keyed providers before rate-limit checks, which drops credits-backed candidates too early. When all keyed providers for a model are rate-limited but a credits-backed provider is still healthy, filterRateLimitedProviders and getRoutingCandidatesForProjectMode never see that healthy fallback, so routing can continue with a rate-limited keyed provider. This defeats the intended “prefer keys, but fall back when keyed options are not suitable” behavior and can increase 429s under keyed-provider saturation.
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Pull request overview
This PR updates gateway chat routing to prefer organization-scoped provider keys over environment-backed (credits) tokens for hybrid projects, and centralizes the “available providers” + “prefer keyed providers” logic across auto-routing and fallback paths.
Changes:
- Centralize provider availability determination by project mode (api-keys / credits / hybrid) and reuse it across routing and fallback flows.
- In hybrid mode, prefer keyed providers when both keyed and env-backed providers can serve the same model (including rate-limit and low-uptime fallbacks).
- Add regression tests covering Alibaba regional routing (DB key should win over regional env token) and the gemini-2.5-flash-lite google-ai-studio vs google-vertex preference case.
Reviewed changes
Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.
| File | Description |
|---|---|
| apps/gateway/src/chat/chat.ts | Adds shared helpers for provider availability and hybrid key-preference; removes region-env override when a DB key exists; applies the new logic across routing/fallback paths. |
| apps/gateway/src/api.spec.ts | Adds regression tests asserting hybrid-mode preference for DB provider keys and keyed-provider routing preference. |
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| function getAvailableProvidersForProjectMode( | ||
| projectMode: string, | ||
| providerKeys: Array<{ provider: string }>, | ||
| providerIds?: string[], | ||
| ): { | ||
| availableProviders: string[]; |
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getAvailableProvidersForProjectMode, preferProvidersWithKeys, and getRoutingCandidatesForProjectMode take projectMode: string, even though Project.mode is a closed union ("api-keys" | "credits" | "hybrid"). Using string removes exhaustiveness/type-safety (and allows accidental invalid values to silently fall through as "hybrid"). Consider typing this as Project["mode"] (or a shared ProjectMode type) and making the branching exhaustive.
|
|
||
| usedToken = providerKey.token; | ||
| usedRegion ??= resolveRegionFromProviderKey(providerKey); | ||
| // Override with region-specific env var if the DB key doesn't match the requested region | ||
| if (usedRegion) { | ||
| const regionToken = getRegionSpecificEnvValue(usedProvider, usedRegion); | ||
| if (regionToken && regionToken !== usedToken) { | ||
| usedToken = regionToken; | ||
| } | ||
| } | ||
| } else if (project.mode === "credits") { |
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The PR description says this change is for hybrid requests, but this hunk also changes api-keys mode behavior by removing the region-specific env var override when a DB provider key exists. Please confirm this is intended; if not, scope the change to hybrid only (or update the PR description to reflect the broader behavior change).
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Actionable comments posted: 2
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⚠️ Outside diff range comments (1)
apps/gateway/src/chat/chat.ts (1)
1908-1941:⚠️ Potential issue | 🟠 MajorApply key preference after the uptime screen.
This path removes credits-backed providers before checking whether any keyed candidate actually beats
currentUptime. In hybrid mode that means we can stick with the degraded original provider even when a credits-backed alternative has better uptime. Prefer keyed providers within the survivingbetterUptimeProviders, not before computing that set.🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed. In `@apps/gateway/src/chat/chat.ts` around lines 1908 - 1941, The current code applies preferProvidersWithKeys (creating preferredAvailableModelProviders from availableModelProviders) too early; move the key-preference filtering to after you compute the uptime-filtered set so keyed providers are only preferred among candidates that already beat currentUptime. Concretely: keep availableModelProviders unchanged, compute metricsCombinations/from modelWithPricing and call getProviderMetricsForCombinations and collapseProvidersToBestRegionPerProvider to produce betterUptimeProviders (or however the uptime filtering is done), then apply preferProvidersWithKeys to that resulting candidate list (instead of applying it before metrics/uptime checks); update references to preferredAvailableModelProviders -> preferredCandidates (or reuse name) where used downstream (e.g., where collapseProvidersToBestRegionPerProvider and any subsequent selection logic expect the keyed preference to be applied).
🤖 Prompt for all review comments with AI agents
Verify each finding against the current code and only fix it if needed.
Inline comments:
In `@apps/gateway/src/chat/chat.ts`:
- Around line 185-244: The helpers currently collapse provider-region info to
provider IDs which loses region constraints used later when callers pick
usedRegion; update getEnvironmentBackedProviders,
getAvailableProvidersForProjectMode and preferProvidersWithKeys to be
region-aware: return and operate on provider-region mappings (e.g., arrays of
ProviderModelMapping-like objects or {providerId, region}) instead of
string[]/Set<string>, make providersWithKeys represent provider->region
membership (or a Set of "provider:region" keys built from providerKeys), ensure
getEnvironmentBackedProviders returns mappings for env-backed providers
including their default/base region (use
hasProviderEnvironmentToken(provider.id) to decide inclusion but attach the
correct region), and change preferProvidersWithKeys to prefer candidates
matching provider+region entries (use providerId and region when filtering) so
usedRegion chosen downstream remains valid.
- Around line 2090-2110: Currently keyed candidates are filtered for keys before
rate-limit checks, which can remove credits-backed options prematurely; instead,
first compute the full candidate list (use the existing providersWithKeys as the
full set), run filterRateLimitedProviders against that full candidate list to
get rateLimitedProviderIds, then call preferProvidersWithKeys(project.mode,
contentFilterPreferredProviders, providersWithKeys) to produce
preferredRoutingProviders and finally call
getRoutingCandidatesForProjectMode(project.mode, preferredRoutingProviders,
rateLimitedProviderIds, providersWithKeys) so the fallback logic in
getRoutingCandidatesForProjectMode can consider credits-backed candidates when
keyed providers are rate-limited.
---
Outside diff comments:
In `@apps/gateway/src/chat/chat.ts`:
- Around line 1908-1941: The current code applies preferProvidersWithKeys
(creating preferredAvailableModelProviders from availableModelProviders) too
early; move the key-preference filtering to after you compute the
uptime-filtered set so keyed providers are only preferred among candidates that
already beat currentUptime. Concretely: keep availableModelProviders unchanged,
compute metricsCombinations/from modelWithPricing and call
getProviderMetricsForCombinations and collapseProvidersToBestRegionPerProvider
to produce betterUptimeProviders (or however the uptime filtering is done), then
apply preferProvidersWithKeys to that resulting candidate list (instead of
applying it before metrics/uptime checks); update references to
preferredAvailableModelProviders -> preferredCandidates (or reuse name) where
used downstream (e.g., where collapseProvidersToBestRegionPerProvider and any
subsequent selection logic expect the keyed preference to be applied).
🪄 Autofix (Beta)
Fix all unresolved CodeRabbit comments on this PR:
- Push a commit to this branch (recommended)
- Create a new PR with the fixes
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apps/gateway/src/api.spec.tsapps/gateway/src/chat/chat.ts
| function getEnvironmentBackedProviders(providerIds?: string[]): string[] { | ||
| const candidateProviders = providerIds | ||
| ? providers.filter((provider) => providerIds.includes(provider.id)) | ||
| : providers; | ||
|
|
||
| return candidateProviders | ||
| .filter((provider) => provider.id !== "llmgateway") | ||
| .filter((provider) => hasProviderEnvironmentToken(provider.id as Provider)) | ||
| .map((provider) => provider.id); | ||
| } | ||
|
|
||
| function getAvailableProvidersForProjectMode( | ||
| projectMode: string, | ||
| providerKeys: Array<{ provider: string }>, | ||
| providerIds?: string[], | ||
| ): { | ||
| availableProviders: string[]; | ||
| providersWithKeys: Set<string>; | ||
| } { | ||
| const providersWithKeys = new Set(providerKeys.map((key) => key.provider)); | ||
|
|
||
| if (projectMode === "api-keys") { | ||
| return { | ||
| availableProviders: Array.from(providersWithKeys), | ||
| providersWithKeys, | ||
| }; | ||
| } | ||
|
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| const envProviders = getEnvironmentBackedProviders(providerIds); | ||
|
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| if (projectMode === "credits") { | ||
| return { | ||
| availableProviders: envProviders, | ||
| providersWithKeys, | ||
| }; | ||
| } | ||
|
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||
| return { | ||
| availableProviders: Array.from( | ||
| new Set([...providersWithKeys, ...envProviders]), | ||
| ), | ||
| providersWithKeys, | ||
| }; | ||
| } | ||
|
|
||
| function preferProvidersWithKeys( | ||
| projectMode: string, | ||
| candidates: ProviderModelMapping[], | ||
| providersWithKeys: Set<string>, | ||
| ): ProviderModelMapping[] { | ||
| if (projectMode !== "hybrid") { | ||
| return candidates; | ||
| } | ||
|
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||
| const keyedCandidates = candidates.filter((candidate) => | ||
| providersWithKeys.has(candidate.providerId), | ||
| ); | ||
|
|
||
| return keyedCandidates.length > 0 ? keyedCandidates : candidates; | ||
| } |
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Keep hybrid availability region-aware.
These helpers flatten availability to provider IDs, but the callers route across expanded provider-region mappings. That drops two constraints we already depend on elsewhere: env-backed providers that only have the default/base token, and DB keys that lock a provider to a specific region. Once a later path picks usedRegion from one of those expanded mappings, the token-resolution step will not correct it because usedRegion is already set. This needs to return region-aware constraints (or filtered mappings), not just string[] / Set<string>.
🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed.
In `@apps/gateway/src/chat/chat.ts` around lines 185 - 244, The helpers currently
collapse provider-region info to provider IDs which loses region constraints
used later when callers pick usedRegion; update getEnvironmentBackedProviders,
getAvailableProvidersForProjectMode and preferProvidersWithKeys to be
region-aware: return and operate on provider-region mappings (e.g., arrays of
ProviderModelMapping-like objects or {providerId, region}) instead of
string[]/Set<string>, make providersWithKeys represent provider->region
membership (or a Set of "provider:region" keys built from providerKeys), ensure
getEnvironmentBackedProviders returns mappings for env-backed providers
including their default/base region (use
hasProviderEnvironmentToken(provider.id) to decide inclusion but attach the
correct region), and change preferProvidersWithKeys to prefer candidates
matching provider+region entries (use providerId and region when filtering) so
usedRegion chosen downstream remains valid.
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apps/gateway/src/chat/chat.ts (1)
2257-2315:⚠️ Potential issue | 🟠 MajorLow-uptime fallback still drops credits-backed providers too early.
Here hybrid mode narrows to
preferProvidersWithKeys()before checking whether any alternative actually has better uptime than the current provider. If a keyed candidate exists but is not better, the credits-backed alternatives are never considered, so this path can stick with the low-uptime provider even though a healthy credits-backed fallback exists. That misses the PR goal of using credits only when no suitable keyed provider is available.🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed. In `@apps/gateway/src/chat/chat.ts` around lines 2257 - 2315, The code applies preferProvidersWithKeys() too early (on availableModelProviders), which prevents credits-backed alternatives from being considered when a keyed provider exists but has worse uptime; instead, compute metrics and provider-agnostic candidates first (use metricsCombinations -> getProviderMetricsForCombinations -> collapseProvidersToBestRegionPerProvider on availableModelProviders), then apply preferProvidersWithKeys() to those provider-agnostic candidates to prefer keyed providers only among candidates that are already better by metrics/uptime; update references to preferredAvailableModelProviders to be the result of preferProvidersWithKeys(providerAgnosticCandidates, providersWithKeys) rather than calling preferProvidersWithKeys before metrics evaluation.
♻️ Duplicate comments (2)
apps/gateway/src/chat/chat.ts (2)
223-323:⚠️ Potential issue | 🟠 MajorKeep hybrid availability region-aware.
These helpers still collapse availability and keyed-ness to plain provider IDs, but the callers route across expanded
providerId + regionmappings. In hybrid mode that means auto-routing and fallback paths can still select a region the org cannot actually use: env-backed providers with only a default token, or DB keys that are locked to an explicit region. OnceusedRegionis chosen downstream, later token resolution does not correct it.Please make these helpers return / prefer region-aware candidates instead of
string[]plusSet<string>.🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed. In `@apps/gateway/src/chat/chat.ts` around lines 223 - 323, The helpers currently collapse provider + region into plain provider IDs which breaks hybrid routing; update them to be region-aware by returning and operating on expanded provider-region candidates instead of string[]/Set<string>. Specifically, change getEnvironmentBackedProviders to return an array of region-aware identifiers (or ProviderModelMapping-like entries) by consulting hasProviderEnvironmentToken per region, change getAvailableProvidersForProjectMode to return availableProviders as region-aware candidates and providersWithKeys as a Set of region-aware keys (derived from providerKeys including region), and update preferProvidersWithKeys and getRoutingCandidatesForProjectMode to accept and prefer region-aware ProviderModelMapping items (use providerId+region or the ProviderModelMapping shape) when filtering keyed vs env-backed and rate-limited entries so hybrid mode routing/prefers use exact provider+region combinations rather than collapsing to provider IDs.
2480-2500:⚠️ Potential issue | 🟠 MajorDon't rate-limit only the keyed subset.
preferProvidersWithKeys()still runs beforefilterRateLimitedProviders(). In hybrid mode, if every keyed candidate is rate-limited, the credits-backed candidates have already been removed, sogetRoutingCandidatesForProjectMode()cannot fall back to them and can only fail open to the keyed set.Run rate-limit filtering over the full
contentFilterPreferredProviderslist and letgetRoutingCandidatesForProjectMode()apply keyed-first fallback from that full candidate set.Suggested change
- const preferredRoutingProviders = preferProvidersWithKeys( - project.mode, - contentFilterPreferredProviders, - providersWithKeys, - ); - // Filter out rate-limited providers during routing const rateLimitedProviderIds = await filterRateLimitedProviders( project.organizationId, - preferredRoutingProviders.map((p) => ({ + contentFilterPreferredProviders.map((p) => ({ providerId: p.providerId, model: (modelInfo as ModelDefinition).id, providerModelName: p.modelName, })), ); const routingCandidates = getRoutingCandidatesForProjectMode( project.mode, - preferredRoutingProviders, + contentFilterPreferredProviders, rateLimitedProviderIds, providersWithKeys, );🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed. In `@apps/gateway/src/chat/chat.ts` around lines 2480 - 2500, Currently filterRateLimitedProviders is called on preferProvidersWithKeys(...) which removes non-keyed (credits-backed) candidates before rate-limit checks; instead call filterRateLimitedProviders with the full contentFilterPreferredProviders mapped to {providerId, model, providerModelName} so rate limits are computed across all candidates, then keep using preferProvidersWithKeys(...) only for ordering/selection and pass the full candidate list plus the rateLimitedProviderIds into getRoutingCandidatesForProjectMode (use symbols: contentFilterPreferredProviders, preferProvidersWithKeys, filterRateLimitedProviders, rateLimitedProviderIds, preferredRoutingProviders, getRoutingCandidatesForProjectMode, providersWithKeys).
🤖 Prompt for all review comments with AI agents
Verify each finding against the current code and only fix it if needed.
Outside diff comments:
In `@apps/gateway/src/chat/chat.ts`:
- Around line 2257-2315: The code applies preferProvidersWithKeys() too early
(on availableModelProviders), which prevents credits-backed alternatives from
being considered when a keyed provider exists but has worse uptime; instead,
compute metrics and provider-agnostic candidates first (use metricsCombinations
-> getProviderMetricsForCombinations -> collapseProvidersToBestRegionPerProvider
on availableModelProviders), then apply preferProvidersWithKeys() to those
provider-agnostic candidates to prefer keyed providers only among candidates
that are already better by metrics/uptime; update references to
preferredAvailableModelProviders to be the result of
preferProvidersWithKeys(providerAgnosticCandidates, providersWithKeys) rather
than calling preferProvidersWithKeys before metrics evaluation.
---
Duplicate comments:
In `@apps/gateway/src/chat/chat.ts`:
- Around line 223-323: The helpers currently collapse provider + region into
plain provider IDs which breaks hybrid routing; update them to be region-aware
by returning and operating on expanded provider-region candidates instead of
string[]/Set<string>. Specifically, change getEnvironmentBackedProviders to
return an array of region-aware identifiers (or ProviderModelMapping-like
entries) by consulting hasProviderEnvironmentToken per region, change
getAvailableProvidersForProjectMode to return availableProviders as region-aware
candidates and providersWithKeys as a Set of region-aware keys (derived from
providerKeys including region), and update preferProvidersWithKeys and
getRoutingCandidatesForProjectMode to accept and prefer region-aware
ProviderModelMapping items (use providerId+region or the ProviderModelMapping
shape) when filtering keyed vs env-backed and rate-limited entries so hybrid
mode routing/prefers use exact provider+region combinations rather than
collapsing to provider IDs.
- Around line 2480-2500: Currently filterRateLimitedProviders is called on
preferProvidersWithKeys(...) which removes non-keyed (credits-backed) candidates
before rate-limit checks; instead call filterRateLimitedProviders with the full
contentFilterPreferredProviders mapped to {providerId, model, providerModelName}
so rate limits are computed across all candidates, then keep using
preferProvidersWithKeys(...) only for ordering/selection and pass the full
candidate list plus the rateLimitedProviderIds into
getRoutingCandidatesForProjectMode (use symbols:
contentFilterPreferredProviders, preferProvidersWithKeys,
filterRateLimitedProviders, rateLimitedProviderIds, preferredRoutingProviders,
getRoutingCandidatesForProjectMode, providersWithKeys).
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apps/gateway/src/api.spec.tsapps/gateway/src/chat/chat.ts
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| const preferredAvailableModelProviders = preferProvidersWithKeys( | ||
| project.mode, | ||
| availableModelProviders, | ||
| providersWithKeys, | ||
| ); |
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In hybrid mode, filtering availableModelProviders through preferProvidersWithKeys here drops non-keyed candidates before the uptime comparison runs. When at least one keyed alternative exists but none of those keyed options have better uptime than the current provider, betterUptimeProviders becomes empty and the request stays on the degraded provider even if a credits-backed alternative has higher uptime. This makes the low-uptime fallback path miss viable healthy fallbacks and can increase failures/latency under keyed-provider degradation.
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apps/gateway/src/chat/chat.ts (1)
2315-2346:⚠️ Potential issue | 🟠 Major | ⚡ Quick winApply hybrid key preference after the uptime filter.
Right now
preferProvidersWithKeys()runs beforebetterUptimeProvidersis derived. In hybrid mode that lets a worse keyed candidate suppress a healthier credits-backed fallback, so the request can stay on the degraded provider even though no suitable keyed alternative exists. Prefer keys only after you've filtered down to candidates that actually beatcurrentUptime.Suggested change
- const preferredAvailableModelProviders = preferProvidersWithKeys( - project.mode, - availableModelProviders, - providersWithKeys, - ); - - if (preferredAvailableModelProviders.length > 0) { + if (availableModelProviders.length > 0) { const rawModelForFallback = models.find((m) => m.id === baseModelId); const modelWithPricing = rawModelForFallback ? { ...rawModelForFallback, providers: expandAllProviderRegions( rawModelForFallback.providers as ProviderModelMapping[], ), } : undefined; if (modelWithPricing) { - const metricsCombinations = preferredAvailableModelProviders.map( + const metricsCombinations = availableModelProviders.map( (p) => ({ modelId: modelWithPricing.id, providerId: p.providerId, region: p.region, }), ); const allMetricsMap = await getProviderMetricsForCombinations(metricsCombinations); const providerAgnosticCandidates = collapseProvidersToBestRegionPerProvider( - preferredAvailableModelProviders, + availableModelProviders, modelWithPricing, { metricsMap: allMetricsMap, isStreaming: stream, promptTokens: routingPromptTokens, }, ); const betterUptimeProviders = providerAgnosticCandidates.filter( (p) => { const providerMetrics = allMetricsMap.get( metricsKey(modelWithPricing.id, p.providerId, p.region), ); return ( !providerMetrics || (providerMetrics.uptime ?? 100) > currentUptime ); }, ); + const preferredBetterUptimeProviders = preferProvidersWithKeys( + project.mode, + betterUptimeProviders, + providersWithKeys, + ); - if (betterUptimeProviders.length > 0) { + if (preferredBetterUptimeProviders.length > 0) { const cheapestResult = getCheapestFromAvailableProviders( - betterUptimeProviders, + preferredBetterUptimeProviders, modelWithPricing, { metricsMap: allMetricsMap, isStreaming: stream, promptTokens: routingPromptTokens, }, );🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed. In `@apps/gateway/src/chat/chat.ts` around lines 2315 - 2346, The call to preferProvidersWithKeys is being applied too early; change the flow so you first derive betterUptimeProviders from availableModelProviders (i.e., filter by uptime against currentUptime), then apply preferProvidersWithKeys to that filtered list (instead of calling preferProvidersWithKeys on availableModelProviders and assigning to preferredAvailableModelProviders up front). Specifically, compute betterUptimeProviders from availableModelProviders using the existing uptime logic, then set preferredAvailableModelProviders = preferProvidersWithKeys(project.mode, betterUptimeProviders, providersWithKeys) and continue using preferredAvailableModelProviders for the subsequent metric/model selection (preserving existing variables like modelWithPricing, metricsCombinations, getProviderMetricsForCombinations, and collapseProvidersToBestRegionPerProvider).
♻️ Duplicate comments (2)
apps/gateway/src/chat/chat.ts (2)
2510-2529:⚠️ Potential issue | 🟠 Major | ⚡ Quick winRate-limit the full hybrid candidate set before dropping credits-backed providers.
This reintroduces the earlier hybrid bug: if
preferProvidersWithKeys()runs beforefilterRateLimitedProviders(), a fully rate-limited keyed subset hides the credits-backed candidates andgetRoutingCandidatesForProjectMode()can only fail open to the keyed set. Keep the full candidate list through rate-limit filtering, then letgetRoutingCandidatesForProjectMode()do the keyed-first fallback.Suggested change
- const preferredRoutingProviders = preferProvidersWithKeys( - project.mode, - contentFilterPreferredProviders, - providersWithKeys, - ); - // Filter out rate-limited providers during routing const rateLimitedProviderIds = await filterRateLimitedProviders( project.organizationId, - preferredRoutingProviders.map((p) => ({ + contentFilterPreferredProviders.map((p) => ({ providerId: p.providerId, model: (modelInfo as ModelDefinition).id, providerModelName: p.modelName, })), ); const routingCandidates = getRoutingCandidatesForProjectMode( project.mode, - preferredRoutingProviders, + contentFilterPreferredProviders, rateLimitedProviderIds, providersWithKeys, );🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed. In `@apps/gateway/src/chat/chat.ts` around lines 2510 - 2529, The current flow filters rate-limited providers from preferredRoutingProviders (result of preferProvidersWithKeys), which can hide credits-backed candidates; instead, pass the full candidate set (providersWithKeys) into filterRateLimitedProviders so rate-limiting is applied to the entire hybrid set, then keep preferredRoutingProviders for getRoutingCandidatesForProjectMode. Concretely, call filterRateLimitedProviders(project.organizationId, providersWithKeys.map(p => ({ providerId: p.providerId, model: (modelInfo as ModelDefinition).id, providerModelName: p.modelName }))) and then call getRoutingCandidatesForProjectMode(project.mode, preferredRoutingProviders, rateLimitedProviderIds, providersWithKeys) so the keyed-first fallback behavior in getRoutingCandidatesForProjectMode is preserved.
264-352:⚠️ Potential issue | 🟠 Major | 🏗️ Heavy liftKeep hybrid keyed availability region-aware.
availableProviders/providersWithKeyscollapse DB keys down to provider IDs, so the auto-routing and fallback paths treat every expanded region of a keyed provider as eligible. If a provider key is locked to one region and one of these paths picks a differentusedRegion, the laterusedRegion ??= resolveRegionFromProviderKey(providerKey)will not correct it. This helper layer needs to carry provider+region membership, not just provider IDs.🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed. In `@apps/gateway/src/chat/chat.ts` around lines 264 - 352, The helper functions collapse DB keys to provider IDs which loses region info; update getAvailableProvidersForProjectMode to track keys per provider+region (e.g. build providersWithKeys as a Map<string, Set<string>> or a Set of composite keys like `${provider}:${region}` using the region from providerKeys), return that region-aware structure, and make preferProvidersWithKeys and getRoutingCandidatesForProjectMode use candidate.region (or candidate.usedRegion) together with candidate.providerId to test membership against the region-aware providersWithKeys when filtering/keying so hybrid routing and fallbacks respect provider-key region locks.
🤖 Prompt for all review comments with AI agents
Verify each finding against the current code and only fix it if needed.
Outside diff comments:
In `@apps/gateway/src/chat/chat.ts`:
- Around line 2315-2346: The call to preferProvidersWithKeys is being applied
too early; change the flow so you first derive betterUptimeProviders from
availableModelProviders (i.e., filter by uptime against currentUptime), then
apply preferProvidersWithKeys to that filtered list (instead of calling
preferProvidersWithKeys on availableModelProviders and assigning to
preferredAvailableModelProviders up front). Specifically, compute
betterUptimeProviders from availableModelProviders using the existing uptime
logic, then set preferredAvailableModelProviders =
preferProvidersWithKeys(project.mode, betterUptimeProviders, providersWithKeys)
and continue using preferredAvailableModelProviders for the subsequent
metric/model selection (preserving existing variables like modelWithPricing,
metricsCombinations, getProviderMetricsForCombinations, and
collapseProvidersToBestRegionPerProvider).
---
Duplicate comments:
In `@apps/gateway/src/chat/chat.ts`:
- Around line 2510-2529: The current flow filters rate-limited providers from
preferredRoutingProviders (result of preferProvidersWithKeys), which can hide
credits-backed candidates; instead, pass the full candidate set
(providersWithKeys) into filterRateLimitedProviders so rate-limiting is applied
to the entire hybrid set, then keep preferredRoutingProviders for
getRoutingCandidatesForProjectMode. Concretely, call
filterRateLimitedProviders(project.organizationId, providersWithKeys.map(p => ({
providerId: p.providerId, model: (modelInfo as ModelDefinition).id,
providerModelName: p.modelName }))) and then call
getRoutingCandidatesForProjectMode(project.mode, preferredRoutingProviders,
rateLimitedProviderIds, providersWithKeys) so the keyed-first fallback behavior
in getRoutingCandidatesForProjectMode is preserved.
- Around line 264-352: The helper functions collapse DB keys to provider IDs
which loses region info; update getAvailableProvidersForProjectMode to track
keys per provider+region (e.g. build providersWithKeys as a Map<string,
Set<string>> or a Set of composite keys like `${provider}:${region}` using the
region from providerKeys), return that region-aware structure, and make
preferProvidersWithKeys and getRoutingCandidatesForProjectMode use
candidate.region (or candidate.usedRegion) together with candidate.providerId to
test membership against the region-aware providersWithKeys when filtering/keying
so hybrid routing and fallbacks respect provider-key region locks.
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apps/gateway/src/api.spec.tsapps/gateway/src/chat/chat.ts
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Prefer org provider keys over regional env tokens on hybrid chat requests, and make hybrid routing prefer keyed providers over credits-backed providers when both can serve the same model. This centralizes hybrid provider availability and ranking across initial routing, auto selection, rate-limit fallback, and low-uptime fallback while still falling back to credits when no keyed provider is suitable. It also adds regressions for Alibaba regional routing and the reported gemini-2.5-flash-lite google-ai-studio vs google-vertex case. Verification: pnpm exec vitest run apps/gateway/src/api.spec.ts -t "hybrid prefers" --no-file-parallelism, pnpm format, pnpm build.
Summary by CodeRabbit
Tests
Refactor