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package main
import (
"context"
"errors"
"flag"
"fmt"
"log/slog"
"net/http"
"os"
"os/signal"
"syscall"
"time"
"aigw/internal/adminapi"
"aigw/internal/auth"
"aigw/internal/billing"
"aigw/internal/catalog"
"aigw/internal/config"
"aigw/internal/controlplane"
"aigw/internal/httpapi"
"aigw/internal/limits"
"aigw/internal/provider"
"aigw/internal/routing"
"aigw/internal/telemetry"
)
func main() {
configPath := flag.String("config", "config.json", "path to the gateway configuration")
flag.Parse()
logger := slog.New(slog.NewJSONHandler(os.Stdout, nil))
cfg, err := config.Load(*configPath)
if err != nil {
logger.Error("configuration_failed", "error", err)
os.Exit(1)
}
ctx, stop := signal.NotifyContext(context.Background(), syscall.SIGINT, syscall.SIGTERM)
defer stop()
if err := run(ctx, cfg, logger); err != nil {
logger.Error("gateway_stopped", "error", err)
os.Exit(1)
}
}
func run(ctx context.Context, cfg config.Config, logger *slog.Logger) error {
metrics := &telemetry.Metrics{}
usageSink := telemetry.NewAsyncUsageLogger(logger, metrics, cfg.Observability.UsageBuffer)
defer func() {
closeContext, cancel := context.WithTimeout(context.Background(), 5*time.Second)
defer cancel()
if err := usageSink.Close(closeContext); err != nil {
logger.Warn("usage_sink_close_failed", "error", err)
}
}()
var authenticator *auth.StaticAuthenticator
var modelCatalog *catalog.Catalog
var store *controlplane.Store
var manager *controlplane.Manager
var managerCancel context.CancelFunc
var managerDone chan struct{}
var requestLimiter *limits.Limiter
if cfg.ControlPlane.Enabled {
var err error
store, err = controlplane.NewStore(ctx, controlplane.Options{
DatabaseURL: cfg.ControlPlane.DatabaseURL, RedisURL: cfg.ControlPlane.RedisURL,
CredentialKey: cfg.ControlPlane.CredentialKey, RedisChannel: cfg.ControlPlane.RedisChannel,
VersionCacheKey: cfg.ControlPlane.SnapshotCacheKey,
})
if err != nil {
return err
}
defer store.Close()
if cfg.ControlPlane.AutoMigrate {
if err := store.Migrate(ctx); err != nil {
return err
}
}
authenticator = auth.NewDynamic(nil, cfg.Auth.AllowAnonymous)
modelCatalog = catalog.NewModels(nil)
requestLimiter = limits.New(cfg.ControlPlane.RedisURL, "aigw:limits", cfg.Billing.DefaultMaxOutputTokens, logger)
defer requestLimiter.Close()
manager = controlplane.NewManager(store, modelCatalog, authenticator, logger,
time.Duration(cfg.ControlPlane.ReloadIntervalSeconds)*time.Second, requestLimiter)
if _, err := manager.Reload(ctx); err != nil {
return fmt.Errorf("load initial control-plane snapshot: %w", err)
}
managerContext, cancel := context.WithCancel(ctx)
managerCancel = cancel
managerDone = make(chan struct{})
go func() {
defer close(managerDone)
manager.Run(managerContext)
}()
defer func() {
managerCancel()
select {
case <-managerDone:
case <-time.After(3 * time.Second):
logger.Warn("control_plane_shutdown_timed_out")
}
}()
} else {
var err error
authenticator, err = auth.NewStatic(os.Getenv(cfg.Auth.KeysEnv), cfg.Auth.AllowAnonymous)
if err != nil {
return err
}
modelCatalog = catalog.New(cfg)
}
var billingService *billing.Service
if cfg.Billing.Enabled {
var err error
billingService, err = billing.New(ctx, billing.Options{
DatabaseURL: cfg.ControlPlane.DatabaseURL, Currency: cfg.Billing.Currency,
DefaultMaxOutputTokens: cfg.Billing.DefaultMaxOutputTokens,
MinTopUpMinor: cfg.Billing.MinTopUpMinor, MaxTopUpMinor: cfg.Billing.MaxTopUpMinor,
StripeEnabled: cfg.Billing.Stripe.Enabled, StripeAPIKey: cfg.Billing.Stripe.APIKey,
StripeWebhookSecret: cfg.Billing.Stripe.WebhookSecret,
StripeSuccessURL: cfg.Billing.Stripe.SuccessURL, StripeCancelURL: cfg.Billing.Stripe.CancelURL,
})
if err != nil {
return err
}
defer billingService.Close()
}
var billingMeter billing.Meter
if billingService != nil {
billingMeter = billingService
}
inferenceAPI := httpapi.New(httpapi.Options{
Authenticator: authenticator,
Catalog: modelCatalog,
Router: routing.New(modelCatalog),
Forwarder: provider.New(cfg.UpstreamHTTP, metrics),
UsageSink: usageSink,
BillingMeter: billingMeter,
Limiter: requestLimiter,
UsageRecorder: store,
Metrics: metrics,
Logger: logger,
MaxBodyBytes: cfg.Server.MaxBodyBytes,
ExposeMetrics: cfg.Observability.ExposeMetrics,
})
root := http.NewServeMux()
root.Handle("/", inferenceAPI.Handler())
if cfg.Admin.Enabled {
adminHandler := adminapi.New(adminapi.Options{
Store: store, Manager: manager, Billing: billingService, Token: cfg.Admin.Token,
Logger: logger, Prefix: cfg.Admin.BasePath,
}).Handler()
root.Handle(cfg.Admin.BasePath, adminHandler)
root.Handle(cfg.Admin.BasePath+"/", adminHandler)
}
if billingService != nil && billingService.StripeEnabled() {
root.Handle("/billing/stripe/webhook", billingService.WebhookHandler())
}
server := &http.Server{
Addr: cfg.Server.Address, Handler: root,
ReadHeaderTimeout: cfg.Server.ReadHeaderTimeout(),
IdleTimeout: cfg.Server.IdleTimeout(),
}
errCh := make(chan error, 1)
go func() {
logger.Info("gateway_listening", "address", cfg.Server.Address, "control_plane", cfg.ControlPlane.Enabled,
"billing", cfg.Billing.Enabled, "stripe", cfg.Billing.Stripe.Enabled)
errCh <- server.ListenAndServe()
}()
select {
case <-ctx.Done():
shutdownContext, cancel := context.WithTimeout(context.Background(), cfg.Server.ShutdownTimeout())
defer cancel()
if err := server.Shutdown(shutdownContext); err != nil {
return fmt.Errorf("shutdown HTTP server: %w", err)
}
return nil
case err := <-errCh:
if errors.Is(err, http.ErrServerClosed) {
return nil
}
return fmt.Errorf("serve HTTP: %w", err)
}
}
|
