Refactor Docker and Makefile configurations for improved build processes

- Updated docker-compose.tools.yml to mount source code at /src and set working directory for backend tools, ensuring proper Go module caching.
- Modified Dockerfile.tools to install the latest golangci-lint version compatible with Go 1.24 and adjusted working directory for build-time operations.
- Enhanced Makefile to build backend tools before running tests and linting, ensuring dependencies are up-to-date and improving overall workflow efficiency.
- Refactored test and handler files to include error handling for database operations, enhancing reliability and debugging capabilities.

internal/app/services/client.go

@@ -141,7 +141,9 @@ func (s *ClientService) ProcessGridUpdate(ctx context.Context, grup GridUpdate)
 					if err != nil {
 						return err
 					}
-					grids.Put([]byte(grid), raw)
+					if err := grids.Put([]byte(grid), raw); err != nil {
+						return err
+					}
 					greq.GridRequests = append(greq.GridRequests, grid)
 				}
 			}
@@ -192,7 +194,9 @@ func (s *ClientService) ProcessGridUpdate(ctx context.Context, grup GridUpdate)
 				if err != nil {
 					return err
 				}
-				grids.Put([]byte(grid), raw)
+				if err := grids.Put([]byte(grid), raw); err != nil {
+					return err
+				}
 				greq.GridRequests = append(greq.GridRequests, grid)
 			}
 		}
@@ -207,7 +211,7 @@ func (s *ClientService) ProcessGridUpdate(ctx context.Context, grup GridUpdate)
 			}
 		}
 		if len(maps) > 1 {
-			grids.ForEach(func(k, v []byte) error {
+			if err := grids.ForEach(func(k, v []byte) error {
 				gd := app.GridData{}
 				if err := json.Unmarshal(v, &gd); err != nil {
 					return err
@@ -244,16 +248,22 @@ func (s *ClientService) ProcessGridUpdate(ctx context.Context, grup GridUpdate)
 							File:  td.File,
 						})
 					}
-					grids.Put(k, raw)
+					if err := grids.Put(k, raw); err != nil {
+						return err
+					}
 				}
 				return nil
-			})
+			}); err != nil {
+				return err
+			}
 		}
 		for mergeid, merge := range maps {
 			if mapid == mergeid {
 				continue
 			}
-			mapB.Delete([]byte(strconv.Itoa(mergeid)))
+			if err := mapB.Delete([]byte(strconv.Itoa(mergeid))); err != nil {
+				return err
+			}
 			slog.Info("reporting merge", "from", mergeid, "to", mapid)
 			s.mapSvc.ReportMerge(mergeid, mapid, app.Coord{X: offset.X - merge.X, Y: offset.Y - merge.Y})
 		}
@@ -271,10 +281,10 @@ func (s *ClientService) ProcessGridUpdate(ctx context.Context, grup GridUpdate)
 func (s *ClientService) ProcessGridUpload(ctx context.Context, id string, extraData string, fileReader io.Reader) error {
 	if extraData != "" {
 		ed := ExtraData{}
-		json.Unmarshal([]byte(extraData), &ed)
+		_ = json.Unmarshal([]byte(extraData), &ed)
 		if ed.Season == 3 {
 			needTile := false
-			s.st.Update(ctx, func(tx *bbolt.Tx) error {
+			if err := s.st.Update(ctx, func(tx *bbolt.Tx) error {
 				raw := s.st.GetGrid(tx, id)
 				if raw == nil {
 					return fmt.Errorf("unknown grid id: %s", id)
@@ -301,7 +311,9 @@ func (s *ClientService) ProcessGridUpload(ctx context.Context, id string, extraD
 				}
 				raw, _ = json.Marshal(cur)
 				return s.st.PutGrid(tx, id, raw)
-			})
+			}); err != nil {
+				return err
+			}
 			if !needTile {
 				slog.Debug("ignoring tile upload: winter")
 				return nil
@@ -316,7 +328,7 @@ func (s *ClientService) ProcessGridUpload(ctx context.Context, id string, extraD
 	cur := app.GridData{}
 	mapid := 0
 
-	s.st.Update(ctx, func(tx *bbolt.Tx) error {
+	if err := s.st.Update(ctx, func(tx *bbolt.Tx) error {
 		raw := s.st.GetGrid(tx, id)
 		if raw == nil {
 			return fmt.Errorf("unknown grid id: %s", id)
@@ -331,7 +343,9 @@ func (s *ClientService) ProcessGridUpload(ctx context.Context, id string, extraD
 		}
 		raw, _ = json.Marshal(cur)
 		return s.st.PutGrid(tx, id, raw)
-	})
+	}); err != nil {
+		return err
+	}
 
 	if updateTile {
 		gridDir := fmt.Sprintf("%s/grids", s.mapSvc.GridStorage())
@@ -374,7 +388,7 @@ func (s *ClientService) UpdatePositions(ctx context.Context, data []byte) error
 	}
 
 	gridDataByID := make(map[string]app.GridData)
-	s.st.View(ctx, func(tx *bbolt.Tx) error {
+	if err := s.st.View(ctx, func(tx *bbolt.Tx) error {
 		for _, craw := range craws {
 			raw := s.st.GetGrid(tx, craw.GridID)
 			if raw != nil {
@@ -385,7 +399,9 @@ func (s *ClientService) UpdatePositions(ctx context.Context, data []byte) error
 			}
 		}
 		return nil
-	})
+	}); err != nil {
+		return err
+	}
 
 	username, _ := ctx.Value(app.ClientUsernameKey).(string)
 
@@ -478,8 +494,12 @@ func (s *ClientService) UploadMarkers(ctx context.Context, data []byte) error {
 				Image:    img,
 			}
 			raw, _ := json.Marshal(m)
-			grid.Put(key, raw)
-			idB.Put(idKey, key)
+			if err := grid.Put(key, raw); err != nil {
+				return err
+			}
+			if err := idB.Put(idKey, key); err != nil {
+				return err
+			}
 		}
 		return nil
 	})