feat: add support for LOG_LEVEL env variable (#942)

backend/internal/bootstrap/db_bootstrap.go

@@ -422,17 +422,18 @@ func getGormLogger() gormLogger.Interface {
 		slogGorm.WithErrorField("error"),
 	)
 
-	if common.EnvConfig.AppEnv == "production" {
-		loggerOpts = append(loggerOpts,
-			slogGorm.SetLogLevel(slogGorm.DefaultLogType, slog.LevelWarn),
-			slogGorm.WithIgnoreTrace(),
-		)
-	} else {
+	if common.EnvConfig.LogLevel == "debug" {
 		loggerOpts = append(loggerOpts,
 			slogGorm.SetLogLevel(slogGorm.DefaultLogType, slog.LevelDebug),
 			slogGorm.WithRecordNotFoundError(),
 			slogGorm.WithTraceAll(),
 		)
+
+	} else {
+		loggerOpts = append(loggerOpts,
+			slogGorm.SetLogLevel(slogGorm.DefaultLogType, slog.LevelWarn),
+			slogGorm.WithIgnoreTrace(),
+		)
 	}
 
 	return slogGorm.New(loggerOpts...)

backend/internal/bootstrap/observability_boostrap.go

@@ -8,6 +8,8 @@ import (
 	"os"
 	"time"
 
+	sloggin "github.com/gin-contrib/slog"
+
 	"github.com/lmittmann/tint"
 	"github.com/mattn/go-isatty"
 	"go.opentelemetry.io/contrib/bridges/otelslog"
@@ -89,28 +91,19 @@ func initOtelLogging(ctx context.Context, resource *resource.Resource) error {
 		return fmt.Errorf("failed to initialize OpenTelemetry log exporter: %w", err)
 	}
 
-	level := slog.LevelDebug
-	if common.EnvConfig.AppEnv == "production" {
-		level = slog.LevelInfo
-	}
+	level, _ := sloggin.ParseLevel(common.EnvConfig.LogLevel)
 
 	// Create the handler
 	var handler slog.Handler
-	switch {
-	case common.EnvConfig.LogJSON:
-		// Log as JSON if configured
+	if common.EnvConfig.LogJSON {
 		handler = slog.NewJSONHandler(os.Stdout, &slog.HandlerOptions{
 			Level: level,
 		})
-	case isatty.IsTerminal(os.Stdout.Fd()):
-		// Enable colors if we have a TTY
+	} else {
 		handler = tint.NewHandler(os.Stdout, &tint.Options{
-			TimeFormat: time.StampMilli,
+			TimeFormat: time.Stamp,
 			Level:      level,
-		})
-	default:
-		handler = slog.NewTextHandler(os.Stdout, &slog.HandlerOptions{
-			Level: level,
+			NoColor:    !isatty.IsTerminal(os.Stdout.Fd()),
 		})
 	}
 

backend/internal/bootstrap/router_bootstrap.go

@@ -12,8 +12,8 @@ import (
 	"strings"
 	"time"
 
+	sloggin "github.com/gin-contrib/slog"
 	"github.com/gin-gonic/gin"
-	sloggin "github.com/samber/slog-gin"
 	"go.opentelemetry.io/contrib/instrumentation/github.com/gin-gonic/gin/otelgin"
 	"golang.org/x/time/rate"
 	"gorm.io/gorm"
@@ -49,30 +49,8 @@ func initRouterInternal(db *gorm.DB, svc *services) (utils.Service, error) {
 		gin.SetMode(gin.TestMode)
 	}
 
-	// do not log these URLs
-	loggerSkipPathsPrefix := []string{
-		"GET /application-configuration/logo",
-		"GET /application-configuration/background-image",
-		"GET /application-configuration/favicon",
-		"GET /_app",
-		"GET /fonts",
-		"GET /healthz",
-		"HEAD /healthz",
-	}
-
 	r := gin.New()
-	r.Use(sloggin.NewWithConfig(slog.Default(), sloggin.Config{
-		Filters: []sloggin.Filter{
-			func(c *gin.Context) bool {
-				for _, prefix := range loggerSkipPathsPrefix {
-					if strings.HasPrefix(c.Request.Method+" "+c.Request.URL.String(), prefix) {
-						return false
-					}
-				}
-				return true
-			},
-		},
-	}))
+	initLogger(r)
 
 	if !common.EnvConfig.TrustProxy {
 		_ = r.SetTrustedProxies(nil)
@@ -200,3 +178,29 @@ func initRouterInternal(db *gorm.DB, svc *services) (utils.Service, error) {
 
 	return runFn, nil
 }
+
+func initLogger(r *gin.Engine) {
+	loggerSkipPathsPrefix := []string{
+		"GET /api/application-configuration/logo",
+		"GET /api/application-configuration/background-image",
+		"GET /api/application-configuration/favicon",
+		"GET /_app",
+		"GET /fonts",
+		"GET /healthz",
+		"HEAD /healthz",
+	}
+
+	r.Use(sloggin.SetLogger(
+		sloggin.WithLogger(func(_ *gin.Context, _ *slog.Logger) *slog.Logger {
+			return slog.Default()
+		}),
+		sloggin.WithSkipper(func(c *gin.Context) bool {
+			for _, prefix := range loggerSkipPathsPrefix {
+				if strings.HasPrefix(c.Request.Method+" "+c.Request.URL.String(), prefix) {
+					return true
+				}
+			}
+			return false
+		}),
+	))
+}

backend/internal/common/env_config.go

@@ -10,6 +10,7 @@ import (
 	"strings"
 
 	"github.com/caarlos0/env/v11"
+	sloggin "github.com/gin-contrib/slog"
 	_ "github.com/joho/godotenv/autoload"
 )
 
@@ -32,6 +33,7 @@ const (
 
 type EnvConfigSchema struct {
 	AppEnv             string     `env:"APP_ENV"`
+	LogLevel           string     `env:"LOG_LEVEL"`
 	AppURL             string     `env:"APP_URL"`
 	DbProvider         DbProvider `env:"DB_PROVIDER"`
 	DbConnectionString string     `env:"DB_CONNECTION_STRING" options:"file"`
@@ -70,6 +72,7 @@ func init() {
 func defaultConfig() EnvConfigSchema {
 	return EnvConfigSchema{
 		AppEnv:             "production",
+		LogLevel:           "info",
 		DbProvider:         "sqlite",
 		DbConnectionString: "",
 		UploadPath:         "data/uploads",
@@ -115,6 +118,11 @@ func parseEnvConfig() error {
 	}
 
 	// Validate the environment variables
+	EnvConfig.LogLevel = strings.ToLower(EnvConfig.LogLevel)
+	if _, err := sloggin.ParseLevel(EnvConfig.LogLevel); err != nil {
+		return errors.New("invalid LOG_LEVEL value. Must be 'debug', 'info', 'warn' or 'error'")
+	}
+
 	switch EnvConfig.DbProvider {
 	case DbProviderSqlite:
 		if EnvConfig.DbConnectionString == "" {