feat: implements fiber panic recovery

Fiber includes a built-in panic recovery middleware that catches panics in route handlers and middlewares, preventing the server from crashing and allowing it to recover. Alongside this, a stack trace handler has been implemented to store system panics in the context locals (stack).

Both the S3 API server and the Admin server use a global error handler to catch unexpected exceptions and recovered panics. The middleware’s logic is to log the panic or internal error and return an S3-style internal server error response.

Additionally, dedicated **Panic** and **InternalError** loggers have been added to the `s3api` debug logger to record system panics and internal errors in the console.

s3api/server_test.go

@@ -16,66 +16,12 @@ package s3api
 
 import (
 	"crypto/tls"
-	"reflect"
 	"testing"
 
 	"github.com/gofiber/fiber/v2"
-	"github.com/versity/versitygw/auth"
 	"github.com/versity/versitygw/backend"
-	"github.com/versity/versitygw/s3api/middlewares"
 )
 
-func TestNew(t *testing.T) {
-	type args struct {
-		app  *fiber.App
-		be   backend.Backend
-		port string
-		root middlewares.RootUserConfig
-	}
-
-	app := fiber.New()
-	be := backend.BackendUnsupported{}
-	router := S3ApiRouter{}
-	port := ":7070"
-
-	tests := []struct {
-		name            string
-		args            args
-		wantS3ApiServer *S3ApiServer
-		wantErr         bool
-	}{
-		{
-			name: "Create S3 api server",
-			args: args{
-				app:  app,
-				be:   be,
-				port: port,
-				root: middlewares.RootUserConfig{},
-			},
-			wantS3ApiServer: &S3ApiServer{
-				app:     app,
-				port:    port,
-				router:  &router,
-				backend: be,
-			},
-			wantErr: false,
-		},
-	}
-	for _, tt := range tests {
-		t.Run(tt.name, func(t *testing.T) {
-			gotS3ApiServer, err := New(tt.args.app, tt.args.be, tt.args.root,
-				tt.args.port, "us-east-1", &auth.IAMServiceInternal{}, nil, nil, nil, nil)
-			if (err != nil) != tt.wantErr {
-				t.Errorf("New() error = %v, wantErr %v", err, tt.wantErr)
-				return
-			}
-			if !reflect.DeepEqual(gotS3ApiServer, tt.wantS3ApiServer) {
-				t.Errorf("New() = %v, want %v", gotS3ApiServer, tt.wantS3ApiServer)
-			}
-		})
-	}
-}
-
 func TestS3ApiServer_Serve(t *testing.T) {
 	tests := []struct {
 		name    string