Implement the Delete handler for the datasource service

internal/datasources/service/service.go

@@ -11,6 +11,7 @@ import (
 	"fmt"
 
 	"github.com/google/uuid"
+	"github.com/rs/zerolog"
 	"google.golang.org/grpc/codes"
 	"google.golang.org/protobuf/encoding/protojson"
 
@@ -187,7 +188,7 @@ func (d *dataSourceService) Create(
 	defer func(stx serviceTX) {
 		err := stx.Rollback()
 		if err != nil {
-			fmt.Printf("failed to rollback transaction: %v", err)
+			zerolog.Ctx(ctx).Error().Err(err).Msg("failed to rollback transaction")
 		}
 	}(stx)
 
@@ -262,11 +263,61 @@ func (d *dataSourceService) Update(
 	panic("implement me")
 }
 
-// nolint:revive // there is a TODO
+// Delete deletes a data source in the given project.
 func (d *dataSourceService) Delete(
 	ctx context.Context, id uuid.UUID, project uuid.UUID, opts *Options) error {
-	//TODO implement me
-	panic("implement me")
+	stx, err := d.txBuilder(d, opts)
+	if err != nil {
+		return fmt.Errorf("failed to start transaction: %w", err)
+	}
+	defer func(stx serviceTX) {
+		err := stx.Rollback()
+		if err != nil {
+			zerolog.Ctx(ctx).Error().Err(err).Msg("failed to rollback transaction")
+		}
+	}(stx)
+
+	// Get the transaction querier
+	tx := stx.Q()
+
+	// List rule types referencing the data source
+	ret, err := tx.ListRuleTypesReferencesByDataSource(ctx, db.ListRuleTypesReferencesByDataSourceParams{
+		DataSourcesID: id,
+		ProjectID:     project,
+	})
+	if err != nil {
+		return fmt.Errorf("failed to list rule types referencing data source %s: %w", id, err)
+	}
+
+	// Check if the data source is in use by any rule types
+	if len(ret) > 0 {
+		// Return an error with the rule types that are using the data source
+		var existingRefs []string
+		for _, r := range ret {
+			existingRefs = append(existingRefs, r.RuleTypeID.String())
+		}
+		return util.UserVisibleError(codes.FailedPrecondition,
+			"data source %s is in use by the following rule types: %v", id, existingRefs)
+	}
+
+	// Delete the data source record
+	_, err = tx.DeleteDataSource(ctx, db.DeleteDataSourceParams{
+		ID:        id,
+		ProjectID: project,
+	})
+	if err != nil {
+		if errors.Is(err, sql.ErrNoRows) {
+			return util.UserVisibleError(codes.NotFound,
+				"data source with id %s not found in project %s", id, project)
+		}
+		return fmt.Errorf("failed to delete data source with id %s: %w", id, err)
+	}
+
+	// Commit the transaction
+	if err := stx.Commit(); err != nil {
+		return fmt.Errorf("failed to commit transaction: %w", err)
+	}
+	return nil
 }
 
 // nolint:revive // there is a TODO

internal/datasources/service/service_test.go

@@ -877,3 +877,167 @@ func restDriverToJson(t *testing.T, rs *minderv1.RestDataSource_Def) []byte {
 
 	return out
 }
+
+func TestDelete(t *testing.T) {
+	t.Parallel()
+
+	type args struct {
+		id      uuid.UUID
+		project uuid.UUID
+		opts    *Options
+	}
+
+	tests := []struct {
+		name    string
+		args    args
+		setup   func(args args, mockDB *mockdb.MockStore)
+		wantErr bool
+	}{
+		{
+			name: "Successful deletion",
+			args: args{
+				id:      uuid.New(),
+				project: uuid.New(),
+				opts:    &Options{},
+			},
+			setup: func(args args, mockDB *mockdb.MockStore) {
+				// Mock ListRuleTypesReferencesByDataSource to return empty list
+				mockDB.EXPECT().
+					ListRuleTypesReferencesByDataSource(gomock.Any(), gomock.Eq(db.ListRuleTypesReferencesByDataSourceParams{
+						DataSourcesID: args.id,
+						ProjectID:     args.project,
+					})).
+					Return([]db.RuleTypeDataSource{}, nil)
+
+				// Mock DeleteDataSource to succeed
+				mockDB.EXPECT().
+					DeleteDataSource(gomock.Any(), gomock.Eq(db.DeleteDataSourceParams{
+						ID:        args.id,
+						ProjectID: args.project,
+					})).
+					Return(db.DataSource{}, nil)
+			},
+			wantErr: false,
+		},
+		{
+			name: "Data source not found",
+			args: args{
+				id:      uuid.New(),
+				project: uuid.New(),
+				opts:    &Options{},
+			},
+			setup: func(args args, mockDB *mockdb.MockStore) {
+				// Mock ListRuleTypesReferencesByDataSource to return empty list
+				mockDB.EXPECT().
+					ListRuleTypesReferencesByDataSource(gomock.Any(), gomock.Eq(db.ListRuleTypesReferencesByDataSourceParams{
+						DataSourcesID: args.id,
+						ProjectID:     args.project,
+					})).
+					Return([]db.RuleTypeDataSource{}, nil)
+
+				// Mock DeleteDataSource to return sql.ErrNoRows
+				mockDB.EXPECT().
+					DeleteDataSource(gomock.Any(), gomock.Eq(db.DeleteDataSourceParams{
+						ID:        args.id,
+						ProjectID: args.project,
+					})).
+					Return(db.DataSource{}, sql.ErrNoRows)
+			},
+			wantErr: true,
+		},
+		{
+			name: "Data source is in use",
+			args: args{
+				id:      uuid.New(),
+				project: uuid.New(),
+				opts:    &Options{},
+			},
+			setup: func(args args, mockDB *mockdb.MockStore) {
+				// Mock ListRuleTypesReferencesByDataSource to return non-empty list
+				mockDB.EXPECT().
+					ListRuleTypesReferencesByDataSource(gomock.Any(), gomock.Eq(db.ListRuleTypesReferencesByDataSourceParams{
+						DataSourcesID: args.id,
+						ProjectID:     args.project,
+					})).
+					Return([]db.RuleTypeDataSource{
+						{RuleTypeID: uuid.New()},
+					}, nil)
+			},
+			wantErr: true,
+		},
+		{
+			name: "Database error when listing references",
+			args: args{
+				id:      uuid.New(),
+				project: uuid.New(),
+				opts:    &Options{},
+			},
+			setup: func(args args, mockDB *mockdb.MockStore) {
+				// Mock ListRuleTypesReferencesByDataSource to return an error
+				mockDB.EXPECT().
+					ListRuleTypesReferencesByDataSource(gomock.Any(), gomock.Eq(db.ListRuleTypesReferencesByDataSourceParams{
+						DataSourcesID: args.id,
+						ProjectID:     args.project,
+					})).
+					Return(nil, fmt.Errorf("database error"))
+			},
+			wantErr: true,
+		},
+		{
+			name: "Database error when deleting data source",
+			args: args{
+				id:      uuid.New(),
+				project: uuid.New(),
+				opts:    &Options{},
+			},
+			setup: func(args args, mockDB *mockdb.MockStore) {
+				// Mock ListRuleTypesReferencesByDataSource to return empty list
+				mockDB.EXPECT().
+					ListRuleTypesReferencesByDataSource(gomock.Any(), gomock.Eq(db.ListRuleTypesReferencesByDataSourceParams{
+						DataSourcesID: args.id,
+						ProjectID:     args.project,
+					})).
+					Return([]db.RuleTypeDataSource{}, nil)
+
+				// Mock DeleteDataSource to return an error
+				mockDB.EXPECT().
+					DeleteDataSource(gomock.Any(), gomock.Eq(db.DeleteDataSourceParams{
+						ID:        args.id,
+						ProjectID: args.project,
+					})).
+					Return(db.DataSource{}, fmt.Errorf("database error"))
+			},
+			wantErr: true,
+		},
+	}
+
+	for _, tt := range tests {
+		tt := tt // capture range variable
+		t.Run(tt.name, func(t *testing.T) {
+			t.Parallel()
+
+			ctrl := gomock.NewController(t)
+			defer ctrl.Finish()
+
+			// Setup
+			mockStore := mockdb.NewMockStore(ctrl)
+
+			svc := NewDataSourceService(mockStore)
+			svc.txBuilder = func(_ *dataSourceService, _ txGetter) (serviceTX, error) {
+				return &fakeTxBuilder{
+					store: mockStore,
+				}, nil
+			}
+
+			tt.setup(tt.args, mockStore)
+
+			err := svc.Delete(context.Background(), tt.args.id, tt.args.project, tt.args.opts)
+			if tt.wantErr {
+				assert.Error(t, err)
+				return
+			}
+
+			require.NoError(t, err)
+		})
+	}
+}