parse env variable in dedicated struct

main.go

@@ -6,8 +6,6 @@ import (
 	"librapi/services"
 	"os"
 	"os/signal"
-	"strconv"
-	"sync"
 
 	"github.com/rs/zerolog"
 	"github.com/rs/zerolog/log"
@@ -16,17 +14,6 @@ import (
 	"librapi/handlers/upload"
 )
 
-const DefaultPort = 8585
-
-var APIPort = sync.OnceValue[int](func() int {
-	port, err := strconv.Atoi(os.Getenv("API_PORT"))
-	if err != nil {
-		log.Debug().Err(err).Msg("unable to load API_PORT")
-		return DefaultPort
-	}
-	return port
-})
-
 func initLogger() {
 	zerolog.TimeFieldFormat = zerolog.TimeFormatUnix
 	log.Logger = log.With().Caller().Logger().Output(zerolog.ConsoleWriter{Out: os.Stderr})
@@ -42,7 +29,7 @@ func main() {
 
 	srv := server.NewServer(
 		ctx,
-		APIPort(),
+		services.GetEnv().GetPort(),
 		server.NewHandler("/upload", upload.Handler(sessionStore)),
 		server.NewHandler("/login", login.Handler(sessionStore)),
 	)

server/server.go

@@ -3,6 +3,7 @@ package server
 import (
 	"context"
 	"errors"
+	"librapi/services"
 	"net/http"
 	"strconv"
 	"time"
@@ -13,7 +14,6 @@ import (
 const (
 	ServerShutdownTimeout = 10 * time.Second
 	ServerReadTimeout     = 5 * time.Second
-	DefaultPort           = 8888
 )
 
 type Handler struct {
@@ -35,8 +35,8 @@ type ServerOption func()
 
 func NewServer(ctx context.Context, port int, handlers ...Handler) Server {
 	if port == 0 {
-		log.Warn().Int("port", DefaultPort).Msg("no port detected, set to default")
+		log.Warn().Int("port", services.GetEnv().GetPort()).Msg("no port detected, set to default")
-		port = DefaultPort
+		port = services.GetEnv().GetPort()
 	}
 
 	srvmux := http.NewServeMux()

services/environments.go

@@ -0,0 +1,63 @@
+package services
+
+import (
+	"os"
+	"strconv"
+	"sync"
+	"time"
+
+	"github.com/rs/zerolog/log"
+)
+
+const defaultAPISessionExpirationDuration = 30 * time.Second
+const defaultPort = 8585
+
+var GetEnv = sync.OnceValue[env](newEnv)
+
+type env struct {
+	adminUsername             string
+	adminPassword             string
+	sessionExpirationDuration time.Duration
+	port                      int
+	isSecure                  bool
+}
+
+func (e env) GetCredentials() (username, password string) {
+	return e.adminUsername, e.adminPassword
+}
+
+func (e env) GetSessionExpirationDuration() time.Duration {
+	return e.sessionExpirationDuration
+}
+
+func (e env) GetPort() int {
+	return e.port
+}
+
+func (e env) IsSecure() bool {
+	return e.isSecure
+}
+
+func newEnv() env {
+	env := env{
+		adminUsername: os.Getenv("API_ADMIN_USERNAME"),
+		adminPassword: os.Getenv("API_ADMIN_PASSWORD"),
+		isSecure:      os.Getenv("API_SECURE") == "true",
+	}
+
+	sessionExpirationDuration, err := strconv.Atoi(os.Getenv("API_SESSION_EXPIRATION_DURATION"))
+	env.sessionExpirationDuration = time.Duration(sessionExpirationDuration)
+	if err != nil {
+		log.Warn().Err(err).Dur("default", defaultAPISessionExpirationDuration).Msg("unable to load API_SESSION_EXPIRATION_DURATION, set to default")
+		env.sessionExpirationDuration = defaultAPISessionExpirationDuration
+	}
+
+	port, err := strconv.Atoi(os.Getenv("API_PORT"))
+	env.port = port
+	if err != nil {
+		log.Warn().Err(err).Int("default", defaultPort).Msg("unable to load API_PORT, set to default")
+		env.port = defaultPort
+	}
+
+	return env
+}

services/sessions.go

@@ -6,29 +6,12 @@ import (
 	"encoding/hex"
 	"errors"
 	"net/http"
-	"os"
-	"strconv"
 	"sync"
 	"time"
 
 	"github.com/rs/zerolog/log"
 )
 
-const defaultAPISessionExpirationDuration = 30 * time.Second
-
-var APISessionExpirationDuration = sync.OnceValue[time.Duration](func() time.Duration {
-	expirationDuration, err := strconv.Atoi(os.Getenv("API_SESSION_EXPIRATION_DURATION"))
-	if err != nil {
-		log.Debug().Err(err).Msg("unable to load API_SESSION_EXPIRATION_DURATION")
-		return defaultAPISessionExpirationDuration
-	}
-	return time.Duration(expirationDuration * int(time.Second))
-})
-
-var APISecure = sync.OnceValue[bool](func() bool {
-	return os.Getenv("API_SECURE") == "true"
-})
-
 var (
 	ErrSessionIDCollision = errors.New("sessionId collision")
 	ErrUnauthorized       = errors.New("unauthorized")
@@ -57,7 +40,7 @@ func (s *Session) GenerateCookie() *http.Cookie {
 		Name:     "session_id",
 		Value:    s.sessionID,
 		HttpOnly: true,
-		Secure:   APISecure(),
+		Secure:   GetEnv().isSecure,
 		Expires:  s.expirationTime,
 	}
 }
@@ -141,7 +124,7 @@ func (s *SessionStore) NewSession() (*Session, error) {
 		return nil, ErrSessionIDCollision
 	}
 
-	now := time.Now().Add(APISessionExpirationDuration())
+	now := time.Now().Add(GetEnv().GetSessionExpirationDuration())
 	session := Session{expirationTime: now, sessionID: sessionID}
 	s.sessions[sessionID] = &session