131 lines
3.5 KiB
Go
131 lines
3.5 KiB
Go
// Command scoreboard-apid serves the root-me.org scoreboard over HTTP/JSON and
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// gRPC. It scrapes the public Rankings fragment through a native Anubis
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// proof-of-work solver, caching the result in memory and refreshing on an
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// interval.
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package main
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import (
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"context"
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"errors"
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"fmt"
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"log/slog"
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"net"
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"net/http"
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"os"
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"os/signal"
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"syscall"
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"time"
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"google.golang.org/grpc"
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"google.golang.org/grpc/reflection"
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pb "git.mkz.me/mycroft/root-me-api/gen/scoreboard/v1"
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"git.mkz.me/mycroft/root-me-api/internal/anubis"
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"git.mkz.me/mycroft/root-me-api/internal/config"
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"git.mkz.me/mycroft/root-me-api/internal/scoreboard"
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"git.mkz.me/mycroft/root-me-api/internal/scraper"
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"git.mkz.me/mycroft/root-me-api/internal/server"
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)
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func main() {
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if err := run(os.Args[1:]); err != nil {
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slog.Error("fatal", "err", err)
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os.Exit(1)
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}
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}
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func run(args []string) error {
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cfg, err := config.Load(args)
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if err != nil {
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return err
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}
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logger := setupLogger(cfg.LogLevel)
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slog.SetDefault(logger)
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// Anubis-solving HTTP client.
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tr, err := anubis.New()
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if err != nil {
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return err
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}
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tr.UserAgent = cfg.UserAgent
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tr.Logger = logger
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client := tr.Client()
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client.Timeout = cfg.RequestTimeout
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// Scraper + store + refresher.
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sc := scraper.New(client, logger)
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store := scoreboard.NewStore()
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fetch := func(ctx context.Context) ([]scoreboard.Entry, error) {
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return sc.Fetch(ctx, cfg.Pages)
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}
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refresher := scoreboard.NewRefresher(store, fetch, cfg.RefreshInterval, logger)
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ctx, stop := signal.NotifyContext(context.Background(), syscall.SIGINT, syscall.SIGTERM)
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defer stop()
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// Warm start: try once before serving so /readyz flips green quickly. A
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// failure here is non-fatal — the refresher will retry on its interval.
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warmCtx, cancel := context.WithTimeout(ctx, cfg.RequestTimeout*time.Duration(cfg.Pages+1))
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if err := refresher.RefreshOnce(warmCtx); err != nil {
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logger.Warn("initial scoreboard load failed; serving will start unready", "err", err)
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}
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cancel()
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go refresher.Run(ctx)
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// HTTP server.
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httpSrv := &http.Server{
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Addr: cfg.HTTPAddr,
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Handler: server.HTTPHandler(store, refresher, logger),
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ReadHeaderTimeout: 10 * time.Second,
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}
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// gRPC server.
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grpcSrv := grpc.NewServer()
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pb.RegisterScoreboardServiceServer(grpcSrv, server.NewGRPC(store))
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reflection.Register(grpcSrv)
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grpcLis, err := net.Listen("tcp", cfg.GRPCAddr)
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if err != nil {
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return fmt.Errorf("grpc listen: %w", err)
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}
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errCh := make(chan error, 2)
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go func() {
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logger.Info("HTTP server listening", "addr", cfg.HTTPAddr)
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if err := httpSrv.ListenAndServe(); err != nil && !errors.Is(err, http.ErrServerClosed) {
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errCh <- fmt.Errorf("http: %w", err)
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}
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}()
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go func() {
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logger.Info("gRPC server listening", "addr", cfg.GRPCAddr)
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if err := grpcSrv.Serve(grpcLis); err != nil {
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errCh <- fmt.Errorf("grpc: %w", err)
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}
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}()
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select {
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case <-ctx.Done():
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logger.Info("shutdown signal received")
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case err := <-errCh:
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logger.Error("server error", "err", err)
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}
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// Graceful shutdown.
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shutCtx, shutCancel := context.WithTimeout(context.Background(), 10*time.Second)
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defer shutCancel()
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if err := httpSrv.Shutdown(shutCtx); err != nil {
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logger.Warn("http shutdown", "err", err)
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}
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grpcSrv.GracefulStop()
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logger.Info("stopped")
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return nil
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}
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func setupLogger(level string) *slog.Logger {
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var lvl slog.Level
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if err := lvl.UnmarshalText([]byte(level)); err != nil {
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lvl = slog.LevelInfo
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}
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return slog.New(slog.NewTextHandler(os.Stderr, &slog.HandlerOptions{Level: lvl}))
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}
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