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package httpapi
import (
"bufio"
"bytes"
"encoding/json"
"io"
"log/slog"
"net/http"
"net/http/httptest"
"strings"
"sync/atomic"
"testing"
"time"
"aigw/internal/auth"
"aigw/internal/catalog"
"aigw/internal/config"
"aigw/internal/domain"
"aigw/internal/provider"
"aigw/internal/routing"
"aigw/internal/telemetry"
)
type captureUsageSink struct {
events chan domain.UsageEvent
}
func (s *captureUsageSink) Publish(event domain.UsageEvent) {
s.events <- event
}
func TestOpenAIProxyRewritesModelAndEmitsUsage(t *testing.T) {
upstream := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
if r.URL.Path != "/v1/chat/completions" {
t.Errorf("unexpected path: %s", r.URL.Path)
}
if r.Header.Get("Authorization") != "Bearer upstream-secret" {
t.Errorf("upstream authorization leaked or missing: %q", r.Header.Get("Authorization"))
}
var request map[string]any
if err := json.NewDecoder(r.Body).Decode(&request); err != nil {
t.Error(err)
}
if request["model"] != "upstream-model" {
t.Errorf("model was not rewritten: %+v", request)
}
w.Header().Set("Content-Type", "application/json")
_, _ = io.WriteString(w, `{"id":"chat-1","choices":[],"usage":{"prompt_tokens":3,"completion_tokens":2,"total_tokens":5}}`)
}))
defer upstream.Close()
gateway, sink := newTestGateway(t, []config.ProviderConfig{{
ID: "primary", Protocol: domain.ProtocolOpenAI, BaseURL: upstream.URL + "/v1", APIKey: "upstream-secret",
}}, []config.RouteConfig{{Provider: "primary", UpstreamModel: "upstream-model", Weight: 1}})
defer gateway.Close()
request, _ := http.NewRequest(http.MethodPost, gateway.URL+"/v1/chat/completions", strings.NewReader(`{"model":"public/model","messages":[{"role":"user","content":"hello"}]}`))
request.Header.Set("Authorization", "Bearer client-secret")
response, err := http.DefaultClient.Do(request)
if err != nil {
t.Fatal(err)
}
defer response.Body.Close()
if response.StatusCode != http.StatusOK {
payload, _ := io.ReadAll(response.Body)
t.Fatalf("unexpected status %d: %s", response.StatusCode, payload)
}
if response.Header.Get("X-AIGW-Request-ID") == "" {
t.Fatal("missing gateway request id")
}
select {
case event := <-sink.events:
if event.PublicModel != "public/model" || event.UpstreamModel != "upstream-model" || event.Usage.TotalTokens != 5 || !event.Success {
t.Fatalf("unexpected usage event: %+v", event)
}
case <-time.After(time.Second):
t.Fatal("usage event was not emitted")
}
}
func TestProxyFailsOverBeforeWritingResponse(t *testing.T) {
var primaryCalls atomic.Int64
primary := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
primaryCalls.Add(1)
w.WriteHeader(http.StatusServiceUnavailable)
}))
defer primary.Close()
var fallbackCalls atomic.Int64
fallback := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
fallbackCalls.Add(1)
w.Header().Set("Content-Type", "application/json")
_, _ = io.WriteString(w, `{"choices":[],"usage":{"prompt_tokens":1,"completion_tokens":1,"total_tokens":2}}`)
}))
defer fallback.Close()
gateway, sink := newTestGateway(t,
[]config.ProviderConfig{
{ID: "primary", Protocol: domain.ProtocolOpenAI, BaseURL: primary.URL + "/v1", APIKey: "one"},
{ID: "fallback", Protocol: domain.ProtocolOpenAI, BaseURL: fallback.URL + "/v1", APIKey: "two"},
},
[]config.RouteConfig{
{Provider: "primary", UpstreamModel: "model", Priority: 0, Weight: 1},
{Provider: "fallback", UpstreamModel: "model", Priority: 10, Weight: 1},
},
)
defer gateway.Close()
response := postOpenAI(t, gateway.URL, false)
defer response.Body.Close()
if response.StatusCode != http.StatusOK || primaryCalls.Load() != 1 || fallbackCalls.Load() != 1 {
t.Fatalf("failover did not complete: status=%d primary=%d fallback=%d", response.StatusCode, primaryCalls.Load(), fallbackCalls.Load())
}
event := <-sink.events
if event.Attempts != 2 || event.ProviderID != "fallback" {
t.Fatalf("unexpected failover event: %+v", event)
}
}
func TestSSEIsFlushedBeforeUpstreamCompletes(t *testing.T) {
release := make(chan struct{})
upstream := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
w.Header().Set("Content-Type", "text/event-stream")
_, _ = io.WriteString(w, "data: {\"id\":\"chunk-1\",\"choices\":[]}\n\n")
w.(http.Flusher).Flush()
<-release
_, _ = io.WriteString(w, "data: [DONE]\n\n")
}))
defer upstream.Close()
gateway, _ := newTestGateway(t, []config.ProviderConfig{{
ID: "primary", Protocol: domain.ProtocolOpenAI, BaseURL: upstream.URL + "/v1", APIKey: "secret",
}}, []config.RouteConfig{{Provider: "primary", UpstreamModel: "model", Weight: 1}})
defer gateway.Close()
response := postOpenAI(t, gateway.URL, true)
defer response.Body.Close()
reader := bufio.NewReader(response.Body)
line, err := reader.ReadString('\n')
if err != nil {
close(release)
t.Fatal(err)
}
if !strings.Contains(line, "chunk-1") {
close(release)
t.Fatalf("unexpected first SSE line: %q", line)
}
close(release)
}
func TestAnthropicHeadersAndPath(t *testing.T) {
upstream := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
if r.URL.Path != "/v1/messages" || r.Header.Get("x-api-key") != "anthropic-upstream" || r.Header.Get("anthropic-version") != "2023-06-01" {
t.Errorf("unexpected anthropic request: path=%s key=%q version=%q", r.URL.Path, r.Header.Get("x-api-key"), r.Header.Get("anthropic-version"))
}
_, _ = io.WriteString(w, `{"type":"message","content":[],"usage":{"input_tokens":4,"output_tokens":6}}`)
}))
defer upstream.Close()
gateway, sink := newTestGateway(t, []config.ProviderConfig{{
ID: "anthropic", Protocol: domain.ProtocolAnthropic, BaseURL: upstream.URL + "/v1", APIKey: "anthropic-upstream",
}}, []config.RouteConfig{{Provider: "anthropic", UpstreamModel: "claude-upstream", Weight: 1}})
defer gateway.Close()
request, _ := http.NewRequest(http.MethodPost, gateway.URL+"/anthropic/v1/messages", strings.NewReader(`{"model":"public/model","max_tokens":10,"messages":[{"role":"user","content":"hello"}]}`))
request.Header.Set("x-api-key", "client-secret")
request.Header.Set("anthropic-version", "2023-06-01")
response, err := http.DefaultClient.Do(request)
if err != nil {
t.Fatal(err)
}
defer response.Body.Close()
if response.StatusCode != http.StatusOK {
t.Fatalf("unexpected status: %d", response.StatusCode)
}
event := <-sink.events
if event.Usage.InputTokens != 4 || event.Usage.OutputTokens != 6 {
t.Fatalf("unexpected anthropic usage: %+v", event.Usage)
}
}
func newTestGateway(t *testing.T, providers []config.ProviderConfig, routes []config.RouteConfig) (*httptest.Server, *captureUsageSink) {
t.Helper()
authenticator, err := auth.NewStatic(`[{"key":"client-secret","key_id":"key-1","tenant_id":"tenant-1","project_id":"project-1","scopes":["inference"]}]`, false)
if err != nil {
t.Fatal(err)
}
cfg := config.Config{
Providers: providers,
Models: []config.ModelConfig{{ID: "public/model", OwnedBy: "test", Routes: routes}},
UpstreamHTTP: config.UpstreamHTTPConfig{
MaxIdleConnections: 100, MaxIdleConnectionsPerHost: 20,
IdleConnectionTimeoutSecs: 10, ResponseHeaderTimeoutSecs: 2,
},
}
metrics := &telemetry.Metrics{}
modelCatalog := catalog.New(cfg)
sink := &captureUsageSink{events: make(chan domain.UsageEvent, 10)}
api := New(Options{
Authenticator: authenticator,
Catalog: modelCatalog,
Router: routing.New(modelCatalog),
Forwarder: provider.New(cfg.UpstreamHTTP, metrics),
UsageSink: sink,
Metrics: metrics,
Logger: slog.New(slog.NewTextHandler(io.Discard, nil)),
MaxBodyBytes: 1 << 20,
})
return httptest.NewServer(api.Handler()), sink
}
func postOpenAI(t *testing.T, gatewayURL string, stream bool) *http.Response {
t.Helper()
payload := []byte(`{"model":"public/model","messages":[{"role":"user","content":"hello"}],"stream":false}`)
if stream {
payload = []byte(`{"model":"public/model","messages":[{"role":"user","content":"hello"}],"stream":true}`)
}
request, _ := http.NewRequest(http.MethodPost, gatewayURL+"/v1/chat/completions", bytes.NewReader(payload))
request.Header.Set("Authorization", "Bearer client-secret")
response, err := http.DefaultClient.Do(request)
if err != nil {
t.Fatal(err)
}
return response
}
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