implementing improved error handling

backend/middlewares/AdminMWs.ts

@@ -37,8 +37,7 @@ export class AdminMWs {
 
       return next();
     } catch (err) {
-      Logger.warn(LOG_TAG, "Error saving database settings", err);
-      return next(new Error(ErrorCodes.SETTINGS_ERROR, err));
+      return next(new Error(ErrorCodes.SETTINGS_ERROR, "Error saving database settings", err));
     }
   }
 
@@ -56,8 +55,7 @@ export class AdminMWs {
       }
       return next();
     } catch (err) {
-      Logger.warn(LOG_TAG, "Error saving database settings", err);
-      return next(new Error(ErrorCodes.SETTINGS_ERROR, err));
+      return next(new Error(ErrorCodes.SETTINGS_ERROR, "Error saving database settings", err));
     }
   }
 }

backend/middlewares/GalleryMWs.ts

@@ -8,7 +8,6 @@ import {SearchTypes} from "../../common/entities/AutoCompleteItem";
 import {ContentWrapper} from "../../common/entities/ConentWrapper";
 import {PhotoDTO} from "../../common/entities/PhotoDTO";
 import {ProjectPath} from "../ProjectPath";
-import {Logger} from "../Logger";
 import {Config} from "../../common/config/private/Config";
 import {UserDTO} from "../../common/entities/UserDTO";
 
@@ -38,9 +37,7 @@ export class GalleryMWs {
       return next();
 
     } catch (err) {
-      Logger.warn(LOG_TAG, "Error during listing the directory", err);
-      console.error(err);
-      return next(new Error(ErrorCodes.GENERAL_ERROR, err));
+      return next(new Error(ErrorCodes.GENERAL_ERROR, "Error during listing the directory", err));
     }
   }
 
@@ -111,10 +108,7 @@ export class GalleryMWs {
       req.resultPipe = new ContentWrapper(null, result);
       return next();
     } catch (err) {
-
-      Logger.warn(LOG_TAG, "Error during searching", err);
-      console.error(err);
-      return next(new Error(ErrorCodes.GENERAL_ERROR, err));
+      return next(new Error(ErrorCodes.GENERAL_ERROR, "Error during searching", err));
     }
   }
 
@@ -134,9 +128,7 @@ export class GalleryMWs {
       req.resultPipe = new ContentWrapper(null, result);
       return next();
     } catch (err) {
-      Logger.warn(LOG_TAG, "Error during searching", err);
-      console.error(err);
-      return next(new Error(ErrorCodes.GENERAL_ERROR, err));
+      return next(new Error(ErrorCodes.GENERAL_ERROR, "Error during searching", err));
     }
   }
 
@@ -152,9 +144,7 @@ export class GalleryMWs {
       req.resultPipe = await ObjectManagerRepository.getInstance().SearchManager.autocomplete(req.params.text);
       return next();
     } catch (err) {
-      Logger.warn(LOG_TAG, "Error during searching", err);
-      console.error(err);
-      return next(new Error(ErrorCodes.GENERAL_ERROR, err));
+      return next(new Error(ErrorCodes.GENERAL_ERROR, "Error during searching", err));
     }
 
   }

backend/middlewares/NotificationMWs.ts

@@ -0,0 +1,22 @@
+import {NextFunction, Request, Response} from "express";
+import {UserRoles} from "../../common/entities/UserDTO";
+import {NotificationManager} from "../model/NotifocationManager";
+
+const LOG_TAG = "[NotificationMWs]";
+export class NotificationMWs {
+
+
+  public static list(req: Request, res: Response, next: NextFunction) {
+
+    if (req.session.user.role >= UserRoles.Admin) {
+      req.resultPipe = NotificationManager.notifications;
+    } else if (NotificationManager.notifications.length > 0) {
+
+      req.resultPipe = NotificationManager.HasNotification;
+    } else {
+      req.resultPipe = [];
+    }
+
+    return next();
+  }
+}

backend/middlewares/RenderingMWs.ts

@@ -5,6 +5,8 @@ import {Message} from "../../common/entities/Message";
 import {SharingDTO} from "../../common/entities/SharingDTO";
 import {Config} from "../../common/config/private/Config";
 import {PrivateConfigClass} from "../../common/config/private/PrivateConfigClass";
+import {UserRoles} from "../../common/entities/UserDTO";
+import {NotificationManager} from "../model/NotifocationManager";
 
 export class RenderingMWs {
 
@@ -55,10 +57,15 @@ export class RenderingMWs {
 
 
   public static renderError(err: any, req: Request, res: Response, next: NextFunction): any {
+
     if (err instanceof Error) {
+      if (!(req.session.user && req.session.user.role >= UserRoles.Developer)) {
+        delete (err.details);
+      }
       let message = new Message<any>(err, null);
       return res.json(message);
     }
+    NotificationManager.error("unknown server error", err);
     return next(err);
   }
 

backend/middlewares/SharingMWs.ts

@@ -1,7 +1,6 @@
 import {NextFunction, Request, Response} from "express";
 import {CreateSharingDTO, SharingDTO} from "../../common/entities/SharingDTO";
 import {ObjectManagerRepository} from "../model/ObjectManagerRepository";
-import {Logger} from "../Logger";
 import {Error, ErrorCodes} from "../../common/entities/Error";
 
 const LOG_TAG = "[SharingMWs]";
@@ -27,9 +26,7 @@ export class SharingMWs {
       return next();
 
     } catch (err) {
-      Logger.warn(LOG_TAG, "Error during retrieving sharing link", err);
-      console.error(err);
-      return next(new Error(ErrorCodes.GENERAL_ERROR, err));
+      return next(new Error(ErrorCodes.GENERAL_ERROR, "Error during retrieving sharing link", err));
     }
 
   }
@@ -71,9 +68,7 @@ export class SharingMWs {
       return next();
 
     } catch (err) {
-      Logger.warn(LOG_TAG, "Error during creating sharing link", err);
-      console.error(err);
-      return next(new Error(ErrorCodes.GENERAL_ERROR, err));
+      return next(new Error(ErrorCodes.GENERAL_ERROR, "Error during creating sharing link", err));
     }
   }
 
@@ -100,9 +95,7 @@ export class SharingMWs {
       return next();
 
     } catch (err) {
-      Logger.warn(LOG_TAG, "Error during creating sharing link", err);
-      console.error(err);
-      return next(new Error(ErrorCodes.GENERAL_ERROR, err));
+      return next(new Error(ErrorCodes.GENERAL_ERROR, "Error during creating sharing link", err));
     }
 
   }

backend/middlewares/thumbnail/ThumbnailGeneratorMWs.ts

@@ -162,8 +162,7 @@ export class ThumbnailGeneratorMWs {
         return next();
       }
     } catch (error) {
-      console.log(error);
-      return next(new Error(ErrorCodes.THUMBNAIL_GENERATION_ERROR, error));
+      return next(new Error(ErrorCodes.THUMBNAIL_GENERATION_ERROR, "Error during generating thumbnail", error));
     }
   }
 

backend/middlewares/user/AuthenticationMWs.ts

@@ -44,8 +44,7 @@ export class AuthenticationMWs {
         return next();
       }
     } catch (err) {
-      console.error(err);
-      return next(new Error(ErrorCodes.CREDENTIAL_NOT_FOUND));
+      return next(new Error(ErrorCodes.CREDENTIAL_NOT_FOUND, null, err));
     }
     if (typeof req.session.user === 'undefined') {
       return next(new Error(ErrorCodes.NOT_AUTHENTICATED));
@@ -109,11 +108,9 @@ export class AuthenticationMWs {
           return next();
         }
       } catch (err) {
-        console.error(err);
-        return next(new Error(ErrorCodes.CREDENTIAL_NOT_FOUND));
+        return next(new Error(ErrorCodes.CREDENTIAL_NOT_FOUND, null, err));
       }
 
-      console.error(err);
       return next(new Error(ErrorCodes.CREDENTIAL_NOT_FOUND));
     }
 
@@ -128,7 +125,7 @@ export class AuthenticationMWs {
     }
     //not enough parameter
     if ((!req.query.sk && !req.params.sharingKey)) {
-      return next(new Error(ErrorCodes.INPUT_ERROR));
+      return next(new Error(ErrorCodes.INPUT_ERROR, "no sharing key provided"));
     }
 
     try {
@@ -151,7 +148,7 @@ export class AuthenticationMWs {
       return next();
 
     } catch (err) {
-      return next(new Error(ErrorCodes.GENERAL_ERROR));
+      return next(new Error(ErrorCodes.GENERAL_ERROR, null, err));
     }
 
   }

backend/middlewares/user/UserMWs.ts

@@ -22,7 +22,7 @@ export class UserMWs {
       return next();
 
     } catch (err) {
-      return next(new Error(ErrorCodes.GENERAL_ERROR));
+      return next(new Error(ErrorCodes.GENERAL_ERROR, null, err));
     }
   }
 
@@ -40,7 +40,7 @@ export class UserMWs {
       return next();
 
     } catch (err) {
-      return next(new Error(ErrorCodes.USER_CREATION_ERROR));
+      return next(new Error(ErrorCodes.USER_CREATION_ERROR, null, err));
     }
 
 
@@ -60,7 +60,7 @@ export class UserMWs {
       return next();
 
     } catch (err) {
-      return next(new Error(ErrorCodes.GENERAL_ERROR));
+      return next(new Error(ErrorCodes.GENERAL_ERROR, null, err));
     }
 
 
@@ -80,7 +80,7 @@ export class UserMWs {
       return next();
 
     } catch (err) {
-      return next(new Error(ErrorCodes.GENERAL_ERROR));
+      return next(new Error(ErrorCodes.GENERAL_ERROR, null, err));
     }
   }
 
@@ -99,7 +99,7 @@ export class UserMWs {
       req.resultPipe = result;
       next();
     } catch (err) {
-      return next(new Error(ErrorCodes.GENERAL_ERROR));
+      return next(new Error(ErrorCodes.GENERAL_ERROR, null, err));
     }
   }
 

backend/model/NotifocationManager.ts

@@ -0,0 +1,28 @@
+import {NotificationDTO, NotificationType} from "../../common/entities/NotificationDTO";
+export class NotificationManager {
+  public static notifications: NotificationDTO[] = [];
+  public static HasNotification: NotificationDTO[] =
+    [
+      {
+        type: NotificationType.info,
+        message: "There are unhandled server notification. Login as Administrator to handle them."
+      }
+    ];
+
+
+  public static error(message: string, details?: any) {
+    NotificationManager.notifications.push({
+      type: NotificationType.error,
+      message: message,
+      details: details
+    });
+  }
+
+  public static warning(message: string, details?: any) {
+    NotificationManager.notifications.push({
+      type: NotificationType.warning,
+      message: message,
+      details: details
+    });
+  }
+}

backend/routes/ErrorRouter.ts

@@ -19,10 +19,9 @@ export class ErrorRouter {
 
   private static addGenericHandler(app) {
     app.use((err: any, req: Request, res: Response, next: Function) => {
-
         //Flush out the stack to the console
-        Logger.error(err);
-        next(new Error(ErrorCodes.SERVER_ERROR, "Unknown server side error"));
+        Logger.error("Unexpected error:", err);
+        next(new Error(ErrorCodes.SERVER_ERROR, "Unknown server side error", err));
       },
       RenderingMWs.renderError
     );

backend/routes/LoggerRouter.ts

@@ -1,6 +1,9 @@
 import {NextFunction, Request, Response} from "express";
 import {Logger} from "../Logger";
 
+/**
+ * Adds logging to express
+ */
 export class LoggerRouter {
   public static route(app: any) {
 

backend/routes/NotificationRouter.ts

@@ -0,0 +1,24 @@
+import {UserRoles} from "../../common/entities/UserDTO";
+import {AuthenticationMWs} from "../middlewares/user/AuthenticationMWs";
+import {RenderingMWs} from "../middlewares/RenderingMWs";
+import {NotificationMWs} from "../middlewares/NotificationMWs";
+import Request = Express.Request;
+import Response = Express.Response;
+
+export class NotificationRouter {
+  public static route(app: any) {
+
+    this.addGetNotifications(app);
+  }
+
+  private static addGetNotifications(app) {
+    app.get("/api/notifications",
+      AuthenticationMWs.authenticate,
+      AuthenticationMWs.authorise(UserRoles.Guest),
+      NotificationMWs.list,
+      RenderingMWs.renderResult
+    );
+  };
+
+
+}

backend/server.ts

@@ -16,6 +16,8 @@ import {LoggerRouter} from "./routes/LoggerRouter";
 import {ProjectPath} from "./ProjectPath";
 import {ThumbnailGeneratorMWs} from "./middlewares/thumbnail/ThumbnailGeneratorMWs";
 import {DiskManager} from "./model/DiskManger";
+import {NotificationRouter} from "./routes/NotificationRouter";
+import {NotificationManager} from "./model/NotifocationManager";
 
 const LOG_TAG = "[server]";
 export class Server {
@@ -72,6 +74,7 @@ export class Server {
     GalleryRouter.route(this.app);
     SharingRouter.route(this.app);
     AdminRouter.route(this.app);
+    NotificationRouter.route(this.app);
 
     ErrorRouter.route(this.app);
 
@@ -99,6 +102,8 @@ export class Server {
       } catch (err) {
         Logger.warn(LOG_TAG, "[MYSQL error]", err);
         Logger.warn(LOG_TAG, "Error during initializing mysql falling back to memory DB");
+
+        NotificationManager.warning("Error during initializing mysql falling back to memory DB", err);
         Config.setDatabaseType(DatabaseType.memory);
         await ObjectManagerRepository.InitMemoryManagers();
       }
@@ -112,6 +117,9 @@ export class Server {
         sharp();
 
       } catch (err) {
+        NotificationManager.warning("Thumbnail hardware acceleration is not possible." +
+          " 'Sharp' node module is not found." +
+          " Falling back to JS based thumbnail generation", err);
         Logger.warn(LOG_TAG, "[Thumbnail hardware acceleration] sharp module error: ", err);
         Logger.warn(LOG_TAG, "Thumbnail hardware acceleration is not possible." +
           " 'Sharp' node module is not found." +
@@ -128,6 +136,9 @@ export class Server {
           if (!err) {
             return;
           }
+          NotificationManager.warning("Thumbnail hardware acceleration is not possible." +
+            " 'gm' node module is not found." +
+            " Falling back to JS based thumbnail generation", err);
           Logger.warn(LOG_TAG, "[Thumbnail hardware acceleration] gm module error: ", err);
           Logger.warn(LOG_TAG, "Thumbnail hardware acceleration is not possible." +
             " 'gm' node module is not found." +
@@ -136,6 +147,9 @@ export class Server {
         });
 
       } catch (err) {
+        NotificationManager.warning("Thumbnail hardware acceleration is not possible." +
+          " 'gm' node module is not found." +
+          " Falling back to JS based thumbnail generation", err);
         Logger.warn(LOG_TAG, "[Thumbnail hardware acceleration] gm module error: ", err);
         Logger.warn(LOG_TAG, "Thumbnail hardware acceleration is not possible." +
           " 'gm' node module is not found." +
@@ -147,12 +161,14 @@ export class Server {
     if (Config.Client.Search.searchEnabled == true &&
       ObjectManagerRepository.getInstance().SearchManager.isSupported() == false) {
 
+      NotificationManager.warning("Search is not supported with these settings, switching off..");
       Logger.warn(LOG_TAG, "Search is not supported with these settings, switching off..");
       Config.Client.Search.searchEnabled = false;
     }
     if (Config.Client.Sharing.enabled == true &&
       ObjectManagerRepository.getInstance().SharingManager.isSupported() == false) {
 
+      NotificationManager.warning("Sharing is not supported with these settings, switching off..");
       Logger.warn(LOG_TAG, "Sharing is not supported with these settings, switching off..");
       Config.Client.Sharing.enabled = false;
     }

common/entities/Error.ts

@@ -21,6 +21,6 @@ export enum ErrorCodes{
 }
 
 export class Error {
-  constructor(public code: ErrorCodes, public message?: string) {
+  constructor(public code: ErrorCodes, public message?: string, public details?: any) {
   }
 }

common/entities/NotificationDTO.ts

@@ -0,0 +1,9 @@
+export enum NotificationType{
+  error, warning, info
+}
+
+export interface NotificationDTO {
+  type: NotificationType;
+  message: string;
+  details?: any;
+}

frontend/app/admin/admin.component.html

@@ -1,6 +1,27 @@
 <app-frame>
-    <div body class="container">
-      <settings-usermanager *ngIf="userManagementEnable"></settings-usermanager>
-      <settings-database></settings-database>
+  <div body class="container">
+
+    <div class="panel panel-default" *ngIf="notificationService.notifications.length>0">
+      <div class="panel-heading">
+        <h3 class="panel-title">Server notifications</h3>
+      </div>
+      <div class="panel-body">
+        <ng-container *ngFor="let notification of notificationService.notifications">
+
+          <div class="alert alert-{{NotificationType[notification.type]}}" role="alert">
+            {{notification.message}}
+            <br *ngIf="notification.details"/>
+            {{notification.details | json}}
+          </div>
+        </ng-container>
+      </div>
+
+      <div class="panel-footer">
+        To dismiss these notifications, restart the server.
+      </div>
     </div>
+
+    <settings-usermanager *ngIf="userManagementEnable"></settings-usermanager>
+    <settings-database></settings-database>
+  </div>
 </app-frame>

frontend/app/admin/admin.component.ts

@@ -3,6 +3,8 @@ import {AuthenticationService} from "../model/network/authentication.service";
 import {Router} from "@angular/router";
 import {UserRoles} from "../../../common/entities/UserDTO";
 import {Config} from "../../../common/config/public/Config";
+import {NotificationService} from "../model/notification.service";
+import {NotificationType} from "../../../common/entities/NotificationDTO";
 @Component({
   selector: 'admin',
   templateUrl: './admin.component.html',
@@ -11,8 +13,13 @@ import {Config} from "../../../common/config/public/Config";
 export class AdminComponent implements OnInit {
   userManagementEnable: boolean = false;
 
-  constructor(private _authService: AuthenticationService, private _router: Router) {
+  NotificationType: any;
+
+  constructor(private _authService: AuthenticationService,
+              private _router: Router,
+              public notificationService: NotificationService) {
     this.userManagementEnable = Config.Client.authenticationRequired;
+    this.NotificationType = NotificationType;
   }
 
   ngOnInit() {

frontend/app/frame/frame.component.css

@@ -38,3 +38,9 @@ ng2-slim-loading-bar {
     display: none;
   }
 }
+
+.badge {
+  margin-left: -5px;
+  padding: 0;
+  background-color: transparent;
+}

frontend/app/frame/frame.component.html

@@ -29,7 +29,9 @@
         <li *ngIf="isAdmin()">
           <a style="cursor: pointer"
              class="admin-link"
-             [routerLink]="['/admin']"><span class="glyphicon glyphicon-wrench" aria-hidden="true"></span>
+             [routerLink]="['/admin']">
+            <span class="glyphicon glyphicon-wrench" aria-hidden="true"></span>
+            <span *ngIf="notificationService.notifications.length>0" class="badge">{{notificationService.notifications.length}}</span>
           </a>
         </li>
         <li *ngIf="authenticationRequired">

frontend/app/frame/frame.component.ts

@@ -4,6 +4,7 @@ import {AuthenticationService} from "../model/network/authentication.service";
 import {UserDTO, UserRoles} from "../../../common/entities/UserDTO";
 import {Config} from "../../../common/config/public/Config";
 import {BehaviorSubject} from "rxjs/BehaviorSubject";
+import {NotificationService} from "../model/notification.service";
 
 @Component({
   selector: 'app-frame',
@@ -19,7 +20,8 @@ export class FrameComponent {
   public title: string;
   isIn: boolean = false;
 
-  constructor(private _authService: AuthenticationService) {
+  constructor(private _authService: AuthenticationService,
+              public notificationService: NotificationService) {
     this.user = this._authService.user;
     this.authenticationRequired = Config.Client.authenticationRequired;
     this.title = Config.Client.applicationTitle;

frontend/app/model/notification.service.ts

@@ -1,5 +1,9 @@
 import {Injectable, ViewContainerRef} from "@angular/core";
 import {ToastsManager} from "ng2-toastr/ng2-toastr";
+import {NetworkService} from "./network/network.service";
+import {AuthenticationService} from "./network/authentication.service";
+import {NotificationDTO, NotificationType} from "../../../common/entities/NotificationDTO";
+import {UserDTO} from "../../../common/entities/UserDTO";
 
 @Injectable()
 export class NotificationService {
@@ -8,9 +12,42 @@ export class NotificationService {
     positionClass: "toast-top-center",
     animate: "flyLeft"
   };
+  notifications: NotificationDTO[] = [];
+  lastUser: UserDTO = null;
 
-  constructor(private _toastr: ToastsManager) {
+  constructor(private _toastr: ToastsManager,
+              private _networkService: NetworkService,
+              private _authService: AuthenticationService) {
 
+    this._authService.user.subscribe(() => {
+      if (this._authService.isAuthenticated() &&
+        (!this.lastUser ||
+        this.lastUser.id != this._authService.user.value.id)) {
+        this.getServerNotifications();
+      }
+      this.lastUser = this._authService.user.value;
+    });
+  }
+
+  async getServerNotifications() {
+    this.notifications = await this._networkService.getJson<NotificationDTO[]>("/notifications");
+    this.notifications.forEach((noti) => {
+      let msg = noti.message;
+      if (noti.details) {
+        msg += " Details: " + JSON.stringify(noti.details);
+      }
+      switch (noti.type) {
+        case  NotificationType.error:
+          this.error(msg, "Server error");
+          break;
+        case  NotificationType.warning:
+          this.warning(msg, "Server error");
+          break;
+        case  NotificationType.info:
+          this.info(msg, "Server info");
+          break;
+      }
+    })
   }
 
   setRootViewContainerRef(vcr: ViewContainerRef) {