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package routing
import (
"errors"
"testing"
"time"
"aigw/internal/catalog"
"aigw/internal/config"
"aigw/internal/domain"
"aigw/internal/providerhealth"
)
func TestPlanHonorsPriorityAndProtocol(t *testing.T) {
cfg := config.Config{
Providers: []config.ProviderConfig{
{ID: "openai-primary", Protocol: domain.ProtocolOpenAI, BaseURL: "https://one.test", APIKey: "one"},
{ID: "openai-fallback", Protocol: domain.ProtocolOpenAI, BaseURL: "https://two.test", APIKey: "two"},
{ID: "anthropic", Protocol: domain.ProtocolAnthropic, BaseURL: "https://three.test", APIKey: "three"},
},
Models: []config.ModelConfig{{
ID: "public/model",
Routes: []config.RouteConfig{
{Provider: "openai-fallback", UpstreamModel: "fallback", Priority: 10, Weight: 1},
{Provider: "anthropic", UpstreamModel: "claude", Priority: 0, Weight: 1},
{Provider: "openai-primary", UpstreamModel: "primary", Priority: 0, Weight: 1},
},
}},
}
router := New(catalog.New(cfg))
plan, err := router.Plan("public/model", domain.ProtocolOpenAI)
if err != nil {
t.Fatal(err)
}
if len(plan) != 2 || plan[0].Provider.ID != "openai-primary" || plan[1].Provider.ID != "openai-fallback" {
t.Fatalf("unexpected plan: %+v", plan)
}
}
func TestPlanSkipsOpenCircuitAndRecoversAfterCooldown(t *testing.T) {
now := time.Date(2026, time.August, 6, 0, 0, 0, 0, time.UTC)
health := providerhealth.New(providerhealth.Options{FailureThreshold: 3, OpenDuration: 30 * time.Second, Now: func() time.Time { return now }})
cfg := config.Config{
Providers: []config.ProviderConfig{
{ID: "primary", Protocol: domain.ProtocolOpenAI, BaseURL: "https://primary.test", APIKey: "one"},
{ID: "fallback", Protocol: domain.ProtocolOpenAI, BaseURL: "https://fallback.test", APIKey: "two"},
},
Models: []config.ModelConfig{{ID: "public/model", Routes: []config.RouteConfig{
{Provider: "primary", UpstreamModel: "model", Priority: 0, Weight: 1},
{Provider: "fallback", UpstreamModel: "model", Priority: 10, Weight: 1},
}}},
}
for range 3 {
health.Observe(providerhealth.RouteKey{ModelID: "public/model", ProviderID: "primary", WireAPI: "chat_completions"}, providerhealth.Observation{StatusCode: 503, Failed: true})
}
router := New(catalog.New(cfg), health)
plan, err := router.Plan("public/model", domain.ProtocolOpenAI)
if err != nil || len(plan) != 1 || plan[0].Provider.ID != "fallback" {
t.Fatalf("open primary was not skipped: plan=%+v err=%v", plan, err)
}
for range 3 {
health.Observe(providerhealth.RouteKey{ModelID: "public/model", ProviderID: "fallback", WireAPI: "chat_completions"}, providerhealth.Observation{StatusCode: 503, Failed: true})
}
if _, err := router.Plan("public/model", domain.ProtocolOpenAI); !errors.Is(err, ErrNoHealthyRoute) {
t.Fatalf("Plan() error = %v, want ErrNoHealthyRoute", err)
}
now = now.Add(31 * time.Second)
plan, err = router.Plan("public/model", domain.ProtocolOpenAI)
if err != nil || len(plan) != 2 || plan[0].Provider.ID != "primary" {
t.Fatalf("routes did not recover after cooldown: plan=%+v err=%v", plan, err)
}
}
func TestPlanUsesWeightsForPrimarySelection(t *testing.T) {
cfg := config.Config{
Providers: []config.ProviderConfig{
{ID: "one", Protocol: domain.ProtocolOpenAI, BaseURL: "https://one.test", APIKey: "one"},
{ID: "two", Protocol: domain.ProtocolOpenAI, BaseURL: "https://two.test", APIKey: "two"},
},
Models: []config.ModelConfig{{ID: "public/model", Routes: []config.RouteConfig{
{Provider: "one", UpstreamModel: "one", Weight: 3},
{Provider: "two", UpstreamModel: "two", Weight: 1},
}}},
}
router := New(catalog.New(cfg))
counts := map[string]int{}
for range 8 {
plan, err := router.Plan("public/model", domain.ProtocolOpenAI)
if err != nil {
t.Fatal(err)
}
counts[plan[0].Provider.ID]++
}
if counts["one"] != 6 || counts["two"] != 2 {
t.Fatalf("unexpected weighted distribution: %+v", counts)
}
}
func TestPlanSeparatesOpenAIWireAPIs(t *testing.T) {
cfg := config.Config{
Providers: []config.ProviderConfig{
{ID: "chat", Protocol: domain.ProtocolOpenAI, WireAPI: "chat_completions", BaseURL: "https://chat.test", APIKey: "one"},
{ID: "responses", Protocol: domain.ProtocolOpenAI, WireAPI: "responses", BaseURL: "https://responses.test", APIKey: "two"},
},
Models: []config.ModelConfig{{ID: "public/model", Routes: []config.RouteConfig{
{Provider: "chat", UpstreamModel: "chat-model", Weight: 1},
{Provider: "responses", UpstreamModel: "responses-model", Weight: 1},
}}},
}
router := New(catalog.New(cfg))
chat, err := router.Plan("public/model", domain.ProtocolOpenAI)
if err != nil || len(chat) != 1 || chat[0].Provider.ID != "chat" {
t.Fatalf("unexpected Chat plan: %+v err=%v", chat, err)
}
responses, err := router.Plan("public/model", domain.ProtocolOpenAIResponses)
if err != nil || len(responses) != 1 || responses[0].Provider.ID != "responses" {
t.Fatalf("unexpected Responses plan: %+v err=%v", responses, err)
}
}
func TestPlanProviderPinsWithoutFallbackToOtherProviders(t *testing.T) {
cfg := config.Config{
Providers: []config.ProviderConfig{
{ID: "primary", Protocol: domain.ProtocolOpenAI, BaseURL: "https://primary.test", APIKey: "one"},
{ID: "backup", Protocol: domain.ProtocolOpenAI, BaseURL: "https://backup.test", APIKey: "two"},
},
Models: []config.ModelConfig{{ID: "public/model", Routes: []config.RouteConfig{
{Provider: "primary", UpstreamModel: "primary-model", Priority: 0, Weight: 1},
{Provider: "backup", UpstreamModel: "backup-model", Priority: 10, Weight: 1},
}}},
}
router := New(catalog.New(cfg))
plan, err := router.PlanProvider("public/model", domain.ProtocolOpenAI, "backup")
if err != nil || len(plan) != 1 || plan[0].Provider.ID != "backup" {
t.Fatalf("unexpected pinned plan: %+v err=%v", plan, err)
}
if _, err := router.PlanProvider("public/model", domain.ProtocolOpenAI, "missing"); !errors.Is(err, ErrProviderNotFound) {
t.Fatalf("missing provider error = %v, want ErrProviderNotFound", err)
}
}
func TestPlanProviderHonorsCircuitBreaker(t *testing.T) {
now := time.Date(2026, time.August, 6, 0, 0, 0, 0, time.UTC)
health := providerhealth.New(providerhealth.Options{FailureThreshold: 1, OpenDuration: time.Minute, Now: func() time.Time { return now }})
cfg := config.Config{
Providers: []config.ProviderConfig{{ID: "primary", Protocol: domain.ProtocolOpenAI, BaseURL: "https://primary.test", APIKey: "one"}},
Models: []config.ModelConfig{{ID: "public/model", Routes: []config.RouteConfig{{Provider: "primary", UpstreamModel: "model", Weight: 1}}}},
}
health.Observe(providerhealth.RouteKey{ModelID: "public/model", ProviderID: "primary", WireAPI: "chat_completions"}, providerhealth.Observation{StatusCode: 503, Failed: true})
router := New(catalog.New(cfg), health)
if _, err := router.PlanProvider("public/model", domain.ProtocolOpenAI, "primary"); !errors.Is(err, ErrNoHealthyRoute) {
t.Fatalf("open pinned provider error = %v, want ErrNoHealthyRoute", err)
}
}
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