feat(logging): introduce slog logger configuration and level resolver

Author: tolgaozen

internal/invoke/invoke.go

@@ -3,13 +3,12 @@ package invoke
 import (
 	"context"
 
+	"go.opentelemetry.io/otel"
 	"go.opentelemetry.io/otel/attribute"
 	otelCodes "go.opentelemetry.io/otel/codes"
 	api "go.opentelemetry.io/otel/metric"
 	"go.opentelemetry.io/otel/trace"
 
-	"go.opentelemetry.io/otel"
-
 	"github.com/Permify/permify/internal/storage"
 	base "github.com/Permify/permify/pkg/pb/base/v1"
 	"github.com/Permify/permify/pkg/token"

pkg/cmd/serve.go

@@ -85,7 +85,10 @@ func serve() func(cmd *cobra.Command, args []string) error {
 		red := color.New(color.FgGreen)
 		_, _ = red.Printf(internal.Banner, internal.Version)
 
-		logger := slog.New(slog.NewTextHandler(os.Stdout, nil))
+		logger := slog.New(slog.NewTextHandler(os.Stdout, &slog.HandlerOptions{
+			Level: getLogLevel(cfg.Log.Level),
+		}))
+
 		slog.SetDefault(logger)
 
 		slog.Info("🚀 starting permify service...")
@@ -329,3 +332,19 @@ func serve() func(cmd *cobra.Command, args []string) error {
 		return nil
 	}
 }
+
+// getLogLevel converts a string representation of log level to its corresponding slog.Level value.
+func getLogLevel(level string) slog.Level {
+	switch level {
+	case "info":
+		return slog.LevelInfo // Return Info level
+	case "warn":
+		return slog.LevelWarn // Return Warning level
+	case "error":
+		return slog.LevelError // Return Error level
+	case "debug":
+		return slog.LevelDebug // Return Debug level
+	default:
+		return slog.LevelInfo // Default to Info level if unrecognized
+	}
+}