153 lines
3.5 KiB
Go
153 lines
3.5 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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"log/slog"
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"net/http"
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"os"
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"os/signal"
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"strconv"
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"syscall"
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"time"
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"github.com/joho/godotenv"
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"github.com/robindittmar/dttmr-api/internal/api/router"
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"github.com/robindittmar/dttmr-api/internal/telemetry"
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)
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type Config struct {
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Environment string
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Port int
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OTLPEndpoint string
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}
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func main() {
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serviceName := "dttmr-api"
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serviceVersion := "0.1.0"
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if err := run(serviceName, serviceVersion); err != nil {
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slog.Error("Service crashed", slog.Any("error", err))
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os.Exit(1)
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}
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}
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func run(serviceName string, serviceVersion string) error {
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_ = godotenv.Load(".env")
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setupLogging()
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slog.Info("Starting service", slog.String("service", serviceName), slog.String("version", serviceVersion))
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cfg := loadConfig()
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telCfg := telemetry.Config{
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ServiceName: serviceName,
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ServiceVersion: serviceVersion,
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Endpoint: cfg.OTLPEndpoint,
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Environment: cfg.Environment,
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}
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shutdownTelemetry, err := telemetry.Init(context.Background(), telCfg)
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if err != nil {
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slog.Error("Failed to initialize telemetry", err)
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return err
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}
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defer func() {
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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 := shutdownTelemetry(shutdownCtx); err != nil {
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slog.Error("Failed to shutdown telemetry", err)
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}
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}()
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srv := makeServer(cfg)
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go func() {
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slog.Info("Starting http server", "addr", srv.Addr)
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if err := srv.ListenAndServe(); err != nil && !errors.Is(err, http.ErrServerClosed) {
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slog.Error("Failed to start http server", err)
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os.Exit(1)
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}
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}()
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quit := make(chan os.Signal, 1)
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signal.Notify(quit, syscall.SIGINT, syscall.SIGTERM)
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sig := <-quit
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slog.Info("Shutting down server...", slog.String("signal", sig.String()))
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ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
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defer cancel()
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if err := srv.Shutdown(ctx); err != nil {
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slog.Error("Server forced to shutdown", slog.Any("error", err))
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return err
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}
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slog.Info("Service shutdown successful!")
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return nil
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}
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func setupLogging() {
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baseHandler := slog.NewJSONHandler(os.Stdout, &slog.HandlerOptions{
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Level: slog.LevelInfo,
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})
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traceHandler := &telemetry.TraceHandler{Handler: baseHandler}
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logger := slog.New(traceHandler)
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slog.SetDefault(logger)
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}
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func loadConfig() *Config {
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envFlag := flag.String("env", "development", "environment to use")
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portFlag := flag.Int("port", 8080, "port to listen on")
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otlpEndpointFlag := flag.String("otlp-endpoint", "localhost:4317", "otlp endpoint")
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flag.Parse()
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cfg := &Config{
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Environment: *envFlag,
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Port: *portFlag,
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OTLPEndpoint: *otlpEndpointFlag,
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}
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assignStringFromEnv("DTTMR_ENVIRONMENT", &cfg.Environment)
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assignIntFromEnv("DTTMR_PORT", &cfg.Port)
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assignStringFromEnv("DTTMR_OTLP_ENDPOINT", &cfg.OTLPEndpoint)
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return cfg
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}
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func assignStringFromEnv(key string, target *string) {
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if val, exists := os.LookupEnv(key); exists {
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*target = val
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}
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}
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func assignIntFromEnv(key string, target *int) {
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if val, exists := os.LookupEnv(key); exists {
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parsed, err := strconv.Atoi(val)
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if err != nil {
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slog.Error("Failed to parse environment variable", slog.String("var", key), slog.Any("error", err))
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} else {
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*target = parsed
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}
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}
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}
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func makeServer(cfg *Config) *http.Server {
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routerConfig := router.Config{}
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mux := router.NewMux(routerConfig)
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srv := &http.Server{
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Addr: fmt.Sprintf(":%d", cfg.Port),
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Handler: mux,
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ReadTimeout: 5 * time.Second,
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WriteTimeout: 10 * time.Second,
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IdleTimeout: 120 * time.Second,
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}
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return srv
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}
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