onasty/mailer/main.go (view raw)
Smirnov Oleksandr
Smirnov Oleksandr
ss2316544@gmail.com refactor: fix annoyances (#97)..., 1 year ago
ss2316544@gmail.com refactor: fix annoyances (#97)..., 1 year ago
| 1 | package main |
| 2 | |
| 3 | import ( |
| 4 | "errors" |
| 5 | "fmt" |
| 6 | "log/slog" |
| 7 | "net/http" |
| 8 | "os" |
| 9 | "os/signal" |
| 10 | "strings" |
| 11 | "syscall" |
| 12 | "time" |
| 13 | |
| 14 | "github.com/nats-io/nats.go" |
| 15 | "github.com/nats-io/nats.go/micro" |
| 16 | "github.com/olexsmir/onasty/internal/logger" |
| 17 | "github.com/olexsmir/onasty/internal/transport/http/httpserver" |
| 18 | |
| 19 | _ "embed" |
| 20 | ) |
| 21 | |
| 22 | //go:embed version |
| 23 | var _version string |
| 24 | |
| 25 | var version = strings.Trim(_version, "\n") |
| 26 | |
| 27 | func main() { |
| 28 | if err := run(); err != nil { |
| 29 | fmt.Fprintf(os.Stderr, "error: %v\n", err) |
| 30 | os.Exit(1) |
| 31 | } |
| 32 | } |
| 33 | |
| 34 | func run() error { |
| 35 | cfg := NewConfig() |
| 36 | nc, err := nats.Connect(cfg.NatsURL) |
| 37 | if err != nil { |
| 38 | return err |
| 39 | } |
| 40 | |
| 41 | logger, err := logger.NewCustomLogger(cfg.LogLevel, cfg.LogFormat, cfg.LogShowLine) |
| 42 | if err != nil { |
| 43 | return err |
| 44 | } |
| 45 | |
| 46 | slog.SetDefault(logger) |
| 47 | |
| 48 | //nolint:exhaustruct |
| 49 | svc, err := micro.AddService(nc, micro.Config{ |
| 50 | Name: "mailer", |
| 51 | Version: version, |
| 52 | }) |
| 53 | if err != nil { |
| 54 | return err |
| 55 | } |
| 56 | |
| 57 | mg := NewMailgun(cfg.MailgunFrom, cfg.MailgunDomain, cfg.MailgunAPIKey) |
| 58 | service := NewService(cfg.AppURL, mg) |
| 59 | handlers := NewHandlers(service) |
| 60 | |
| 61 | if err := handlers.RegisterAll(svc); err != nil { |
| 62 | return err |
| 63 | } |
| 64 | |
| 65 | if cfg.MetricsEnabled { |
| 66 | srv := httpserver.NewServer(MetricsHandler(), httpserver.Config{ |
| 67 | Port: cfg.MetricsPort, |
| 68 | ReadTimeout: 10 * time.Second, |
| 69 | WriteTimeout: 10 * time.Second, |
| 70 | MaxHeaderSizeMb: 1, |
| 71 | }) |
| 72 | go func() { |
| 73 | slog.Info("starting metrics server", "port", cfg.MetricsPort) |
| 74 | if err := srv.Start(); !errors.Is(err, http.ErrServerClosed) { |
| 75 | slog.Error("failed to start metrics server", "error", err) |
| 76 | } |
| 77 | }() |
| 78 | } |
| 79 | |
| 80 | slog.Info("the service is listening") |
| 81 | |
| 82 | // graceful shutdown |
| 83 | quitCh := make(chan os.Signal, 1) |
| 84 | signal.Notify(quitCh, syscall.SIGINT, syscall.SIGTERM) |
| 85 | <-quitCh |
| 86 | |
| 87 | slog.Info("stopping the service") |
| 88 | |
| 89 | if err := svc.Stop(); err != nil { |
| 90 | return err |
| 91 | } |
| 92 | |
| 93 | if err := nc.Drain(); err != nil { |
| 94 | return err |
| 95 | } |
| 96 | |
| 97 | return nil |
| 98 | } |