89 lines
1.9 KiB
Go
89 lines
1.9 KiB
Go
package main
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import (
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"context"
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"errors"
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"flag"
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"log/slog"
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"net/http"
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"os"
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"os/signal"
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"path/filepath"
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"syscall"
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"time"
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"github.com/wzray/dns/internal/resolv"
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"github.com/wzray/dns/internal/server"
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)
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func main() {
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addr := flag.String("addr", ":8080", "HTTP listen address")
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logLevel := flag.String("log-level", "info", "Log level: debug, info, warn, error")
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logFormat := flag.String("log-format", "text", "Log format: text or json")
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flag.Parse()
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log := newLogger(*logLevel, *logFormat)
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resolvPath := resolv.DefaultPath
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if err := os.MkdirAll(filepath.Dir(resolvPath), 0o755); err != nil {
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log.Error("prepare resolv directory", "err", err)
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os.Exit(1)
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}
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mgr := resolv.New(resolvPath)
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srv := server.New(mgr, log)
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httpSrv := &http.Server{
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Addr: *addr,
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Handler: srv.Handler(),
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ReadHeaderTimeout: 5 * time.Second,
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}
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ctx, stop := signal.NotifyContext(context.Background(), syscall.SIGINT, syscall.SIGTERM)
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defer stop()
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errCh := make(chan error, 1)
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go func() {
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log.Info("starting server", "addr", *addr)
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if err := httpSrv.ListenAndServe(); err != nil && !errors.Is(err, http.ErrServerClosed) {
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errCh <- 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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log.Info("shutting down")
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case err := <-errCh:
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log.Error("server error", "err", err)
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os.Exit(1)
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}
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shutdownCtx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
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defer cancel()
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if err := httpSrv.Shutdown(shutdownCtx); err != nil {
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log.Error("graceful shutdown failed", "err", err)
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os.Exit(1)
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}
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}
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func newLogger(level, format string) *slog.Logger {
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var lvl slog.Level
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switch level {
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case "debug":
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lvl = slog.LevelDebug
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case "warn":
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lvl = slog.LevelWarn
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case "error":
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lvl = slog.LevelError
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default:
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lvl = slog.LevelInfo
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}
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opts := &slog.HandlerOptions{Level: lvl}
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var h slog.Handler
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if format == "json" {
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h = slog.NewJSONHandler(os.Stderr, opts)
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} else {
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h = slog.NewTextHandler(os.Stderr, opts)
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}
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return slog.New(h)
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}
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