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98 lines
2.1 KiB
Go
98 lines
2.1 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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"fmt"
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"io"
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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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"syscall"
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"time"
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"git.runcible.io/learning/pulley/internal/logging"
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)
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const Version = "1.0.0"
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type config struct {
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port int
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env string
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logLevel string
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}
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type application struct {
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config config
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logger *slog.Logger
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}
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func run(ctx context.Context, w io.Writer, args []string) error {
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var cfg config
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flagSet := flag.NewFlagSet(args[0], flag.ExitOnError)
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flagSet.IntVar(&cfg.port, "port", 5002, "API server port")
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flagSet.StringVar(&cfg.env, "env", "development", "Environment (development|staging|production)")
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flagSet.StringVar(&cfg.logLevel, "log-level", "INFO", "Logging Level (INFO|DEBUG|WARN|ERROR)")
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if err := flagSet.Parse(args[1:]); err != nil {
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return err
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}
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logger := logging.InitLogging(cfg.logLevel, w, true)
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app := application{config: cfg, logger: logger}
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srv := &http.Server{
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Addr: fmt.Sprintf("%s:%d", "0.0.0.0", app.config.port),
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ErrorLog: slog.NewLogLogger(app.logger.Handler(), slog.LevelError),
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IdleTimeout: time.Minute,
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ReadTimeout: 5 * time.Second,
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WriteTimeout: 10 * time.Second,
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MaxHeaderBytes: 524288, // 0.5 mb
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Handler: app.routes(),
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}
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slog.Info(fmt.Sprintf("Listening on http://%s", srv.Addr))
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defer func() {
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slog.Debug("Must have hit a graceful shutdown")
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}()
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go func() {
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if err := srv.ListenAndServe(); !errors.Is(err, http.ErrServerClosed) {
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slog.Error(err.Error())
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os.Exit(1)
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slog.Info("Stopped serving connections")
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}
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}()
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// Handle graceful shutdown
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sigChan := make(chan os.Signal, 1)
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signal.Notify(sigChan, syscall.SIGINT, syscall.SIGTERM)
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// Block until signal is received
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<-sigChan
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shutdownCtx, shutdownRelease := context.WithTimeout(ctx, 10*time.Second)
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defer shutdownRelease()
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if err := srv.Shutdown(shutdownCtx); err != nil {
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slog.Error("Failed to close within context timeout. Forcing server close.")
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srv.Close()
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return err
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}
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return nil
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}
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func main() {
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ctx := context.Background()
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if err := run(ctx, os.Stdout, os.Args); err != nil {
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slog.Error(err.Error())
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os.Exit(1)
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}
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}
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