Add logging

pkg/modules/migration/vikunja-file/vikunja.go

@@ -20,6 +20,7 @@ import (
 	"archive/zip"
 	"bytes"
 	"code.vikunja.io/api/pkg/db"
+	"code.vikunja.io/api/pkg/log"
 	"code.vikunja.io/api/pkg/models"
 	"code.vikunja.io/api/pkg/modules/migration"
 	"code.vikunja.io/api/pkg/user"
@@ -30,6 +31,8 @@ import (
 	"strings"
 )
 
+const logPrefix = "[Vikunja File Import] "
+
 type VikunjaFileMigrator struct {
 }
 
@@ -43,6 +46,8 @@ func (v *VikunjaFileMigrator) Migrate(user *user.User, file io.ReaderAt, size in
 		return fmt.Errorf("could not open import file: %s", err)
 	}
 
+	log.Debugf(logPrefix+"Importing a zip file containing %d files", len(r.File))
+
 	var dataFile *zip.File
 	var filterFile *zip.File
 	storedFiles := make(map[int64]*zip.File)
@@ -54,18 +59,25 @@ func (v *VikunjaFileMigrator) Migrate(user *user.User, file io.ReaderAt, size in
 				return fmt.Errorf("could not convert file id: %s", err)
 			}
 			storedFiles[id] = f
+			log.Debugf(logPrefix + "Found a blob file")
 			continue
 		}
 		if f.Name == "data.json" {
 			dataFile = f
+			log.Debugf(logPrefix + "Found a data file")
 			continue
 		}
 		if f.Name == "filters.json" {
 			filterFile = f
+			log.Debugf(logPrefix + "Found a filter file")
 		}
 	}
 
-	// TODO: check we have all files
+	if dataFile == nil {
+		return fmt.Errorf("no data file provided")
+	}
+
+	log.Debugf(logPrefix + "")
 
 	//////
 	// Import the bulk of Vikunja data
@@ -117,6 +129,11 @@ func (v *VikunjaFileMigrator) Migrate(user *user.User, file io.ReaderAt, size in
 		return fmt.Errorf("could not insert data: %s", err)
 	}
 
+	if filterFile == nil {
+		log.Debugf(logPrefix + "No filter file found")
+		return nil
+	}
+
 	///////
 	// Import filters
 	ff, err := filterFile.Open()
@@ -135,6 +152,8 @@ func (v *VikunjaFileMigrator) Migrate(user *user.User, file io.ReaderAt, size in
 		return fmt.Errorf("could not read filter data: %s", err)
 	}
 
+	log.Debugf(logPrefix+"Importing %d saved filters", len(filters))
+
 	s := db.NewSession()
 	defer s.Close()