Moved config to own module

cmd/api-server/main.go

@@ -3,29 +3,21 @@ package main
 import (
 	"context"
 	"errors"
-	"flag"
 	"fmt"
 	"log/slog"
 	"net/http"
 	"os"
 	"os/signal"
-	"strconv"
 	"syscall"
 	"time"
 
 	"github.com/joho/godotenv"
 	"github.com/robindittmar/dttmr-api/internal/api/router"
+	"github.com/robindittmar/dttmr-api/internal/config"
 	"github.com/robindittmar/dttmr-api/internal/database"
 	"github.com/robindittmar/dttmr-api/internal/telemetry"
 )
 
-type Config struct {
-	Environment  string
-	Port         int
-	OTLPEndpoint string
-	DatabaseURL  string
-}
-
 func main() {
 	serviceName := "dttmr-api"
 	serviceVersion := "0.1.0"
@@ -42,7 +34,7 @@ func run(serviceName string, serviceVersion string) error {
 
 	slog.Info("Starting service", slog.String("service", serviceName), slog.String("version", serviceVersion))
 
-	cfg := loadConfig()
+	cfg := config.Load()
 
 	telCfg := telemetry.Config{
 		ServiceName:    serviceName,
@@ -113,47 +105,7 @@ func setupLogging() {
 	slog.SetDefault(logger)
 }
 
-func loadConfig() *Config {
-	envFlag := flag.String("env", "development", "environment to use")
-	portFlag := flag.Int("port", 8080, "port to listen on")
-	otlpEndpointFlag := flag.String("otlp-endpoint", "localhost:4317", "otlp endpoint")
-	databaseUrlFlag := flag.String("database-url", "postgres://postgres:postgres@localhost:5432/postgres?sslmode=disable", "database connection string")
-
-	flag.Parse()
-
-	cfg := &Config{
-		Environment:  *envFlag,
-		Port:         *portFlag,
-		OTLPEndpoint: *otlpEndpointFlag,
-		DatabaseURL:  *databaseUrlFlag,
-	}
-
-	assignStringFromEnv("DTTMR_ENVIRONMENT", &cfg.Environment)
-	assignIntFromEnv("DTTMR_PORT", &cfg.Port)
-	assignStringFromEnv("DTTMR_OTLP_ENDPOINT", &cfg.OTLPEndpoint)
-	assignStringFromEnv("DTTMR_DATABASE_URL", &cfg.DatabaseURL)
-
-	return cfg
-}
-
-func assignStringFromEnv(key string, target *string) {
-	if val, exists := os.LookupEnv(key); exists {
-		*target = val
-	}
-}
-
-func assignIntFromEnv(key string, target *int) {
-	if val, exists := os.LookupEnv(key); exists {
-		parsed, err := strconv.Atoi(val)
-		if err != nil {
-			slog.Error("Failed to parse environment variable", slog.String("var", key), slog.Any("error", err))
-		} else {
-			*target = parsed
-		}
-	}
-}
-
-func makeServer(cfg *Config) *http.Server {
+func makeServer(cfg *config.Config) *http.Server {
 	routerConfig := router.Config{}
 	mux := router.NewMux(routerConfig)