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main.go
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main.go
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//go:generate go run -mod=mod github.com/magefile/mage downloadSwaggerUi
package main
import (
"context"
"errors"
"flag"
"log/slog"
"net"
"net/http"
"os"
"os/signal"
"time"
"github.com/go-chi/chi/v5"
"github.com/go-chi/chi/v5/middleware"
"go.opentelemetry.io/otel/exporters/prometheus"
"go.opentelemetry.io/otel/sdk/metric"
"github.com/baez90/go-icndb/api/jokes"
"github.com/baez90/go-icndb/api/observability"
"github.com/baez90/go-icndb/api/swagger"
"github.com/baez90/go-icndb/internal/logging"
"github.com/baez90/go-icndb/internal/metrics"
)
var (
appCfg struct {
HTTP struct {
Address string
ReadHeaderTimeout time.Duration
}
Logging struct {
Level logging.LevelVar
}
Jokes struct {
DefaultFirstName string
DefaultLastName string
}
}
)
func main() {
appCfg.Logging.Level = logging.LevelVar{
Value: new(slog.LevelVar),
}
setupLogging()
flagSet := flag.NewFlagSet("icndb", flag.ExitOnError)
prepareFlags(flagSet)
if err := flagSet.Parse(os.Args[1:]); err != nil {
slog.Error("failed to parse flags", slog.String("error", err.Error()))
os.Exit(1)
}
ctx, cancel := signal.NotifyContext(context.Background(), os.Interrupt, os.Kill)
err := run(ctx)
cancel()
if err != nil {
slog.Error("Error occurred", slog.String("error", err.Error()))
os.Exit(1)
}
}
func run(ctx context.Context) error {
logger := slog.Default()
router := chi.NewRouter()
promExporter, err := prometheus.New()
if err != nil {
return err
}
provider := metric.NewMeterProvider(metric.WithReader(promExporter))
meter := provider.Meter("github.com/baez90/go-icndb")
router.Use(logging.RequestLogger(logger))
router.Use(metrics.RequestMetrics(meter))
router.Use(middleware.Recoverer)
observability.SetupRoutes(router)
router.Route("/swagger", swagger.SetupRoutes)
router.Route("/api/jokes", jokes.RouterSetup(appCfg.Jokes.DefaultFirstName, appCfg.Jokes.DefaultLastName))
router.Mount("/", http.RedirectHandler("/swagger/ui/index.html", http.StatusPermanentRedirect))
srv := &http.Server{
Addr: appCfg.HTTP.Address,
Handler: router,
ReadHeaderTimeout: 100 * time.Millisecond,
BaseContext: func(listener net.Listener) context.Context {
return ctx
},
}
logger.Info("Starting server", slog.String("address", appCfg.HTTP.Address))
go func() {
if err := srv.ListenAndServe(); err != nil && !errors.Is(err, http.ErrServerClosed) {
logger.Error("Error occurred", slog.String("error", err.Error()))
}
}()
<-ctx.Done()
return srv.Shutdown(context.Background())
}
func setupLogging() {
opts := slog.HandlerOptions{
Level: appCfg.Logging.Level.Value,
}
handler := slog.NewJSONHandler(os.Stderr, &opts)
slog.SetDefault(slog.New(handler))
}
func prepareFlags(flagSet *flag.FlagSet) {
flagSet.StringVar(
&appCfg.HTTP.Address,
"http.address",
envOr("ICNDB_HTTP_ADDRESS", ":3000", noOpParse),
"Listener address, the HTTP server will open - ICNDB_HTTP_ADDRESS",
)
flagSet.StringVar(
&appCfg.Jokes.DefaultFirstName,
"jokes.default-first-name",
envOr("ICNDB_JOKES_DEFAULT_FIRST_NAME", "Chuck", noOpParse),
"Name to replace Chuck with in Joke - ICNDB_JOKES_DEFAULT_FIRST_NAME",
)
flagSet.StringVar(
&appCfg.Jokes.DefaultLastName,
"jokes.default-last-name",
envOr("ICNDB_JOKES_DEFAULT_LAST_NAME", "Norris", noOpParse),
"Name to replace Norris with in Joke - ICNDB_JOKES_DEFAULT_LAST_NAME",
)
flagSet.Var(
&appCfg.Logging.Level,
"log.level",
"Logging level, one of: debug, info, warn, error",
)
}
func envOr[T any](key string, defaultValue T, parse func(v string) (T, error)) T {
envVal, ok := os.LookupEnv(key)
if !ok {
return defaultValue
}
envVal = os.ExpandEnv(envVal)
if parsed, err := parse(envVal); err != nil {
return defaultValue
} else {
return parsed
}
}
func noOpParse(v string) (string, error) {
return v, nil
}