This closes #861, support concurrency get cell picture and remove unused internal function `getSheetNameByID`

cell_test.go

@@ -14,15 +14,23 @@ import (
 )
 
 func TestConcurrency(t *testing.T) {
-	f := NewFile()
+	f, err := OpenFile(filepath.Join("test", "Book1.xlsx"))
+	assert.NoError(t, err)
 	wg := new(sync.WaitGroup)
 	for i := 1; i <= 5; i++ {
 		wg.Add(1)
 		go func(val int, t *testing.T) {
+			// Concurrency set cell value
 			assert.NoError(t, f.SetCellValue("Sheet1", fmt.Sprintf("A%d", val), val))
 			assert.NoError(t, f.SetCellValue("Sheet1", fmt.Sprintf("B%d", val), strconv.Itoa(val)))
 			_, err := f.GetCellValue("Sheet1", fmt.Sprintf("A%d", val))
 			assert.NoError(t, err)
+			// Concurrency get cell picture
+			name, raw, err := f.GetPicture("Sheet1", "A1")
+			assert.Equal(t, "", name)
+			assert.Nil(t, raw)
+			assert.NoError(t, err)
+
 			wg.Done()
 		}(i, t)
 	}

drawing.go

@@ -1146,8 +1146,8 @@ func (f *File) drawingParser(path string) (*xlsxWsDr, int) {
 		err error
 		ok  bool
 	)
-
-	if f.Drawings[path] == nil {
+	_, ok = f.Drawings.Load(path)
+	if !ok {
 		content := xlsxWsDr{}
 		content.A = NameSpaceDrawingML.Value
 		content.Xdr = NameSpaceDrawingMLSpreadSheet.Value
@@ -1171,10 +1171,10 @@ func (f *File) drawingParser(path string) (*xlsxWsDr, int) {
 				})
 			}
 		}
-		f.Drawings[path] = &content
+		f.Drawings.Store(path, &content)
 	}
-	wsDr := f.Drawings[path]
-	return wsDr, len(wsDr.OneCellAnchor) + len(wsDr.TwoCellAnchor) + 2
+	wsDr, _ := f.Drawings.Load(path)
+	return wsDr.(*xlsxWsDr), len(wsDr.(*xlsxWsDr).OneCellAnchor) + len(wsDr.(*xlsxWsDr).TwoCellAnchor) + 2
 }
 
 // addDrawingChart provides a function to add chart graphic frame by given
@@ -1232,7 +1232,7 @@ func (f *File) addDrawingChart(sheet, drawingXML, cell string, width, height, rI
 		FPrintsWithSheet: formatSet.FPrintsWithSheet,
 	}
 	content.TwoCellAnchor = append(content.TwoCellAnchor, &twoCellAnchor)
-	f.Drawings[drawingXML] = content
+	f.Drawings.Store(drawingXML, content)
 	return err
 }
 
@@ -1272,7 +1272,7 @@ func (f *File) addSheetDrawingChart(drawingXML string, rID int, formatSet *forma
 		FPrintsWithSheet: formatSet.FPrintsWithSheet,
 	}
 	content.AbsoluteAnchor = append(content.AbsoluteAnchor, &absoluteAnchor)
-	f.Drawings[drawingXML] = content
+	f.Drawings.Store(drawingXML, content)
 }
 
 // deleteDrawing provides a function to delete chart graphic frame by given by
@@ -1313,6 +1313,6 @@ func (f *File) deleteDrawing(col, row int, drawingXML, drawingType string) (err
 			}
 		}
 	}
-	f.Drawings[drawingXML] = wsDr
+	f.Drawings.Store(drawingXML, wsDr)
 	return err
 }

drawing_test.go

@@ -12,12 +12,13 @@
 package excelize
 
 import (
+	"sync"
 	"testing"
 )
 
 func TestDrawingParser(t *testing.T) {
 	f := File{
-		Drawings: make(map[string]*xlsxWsDr),
+		Drawings: sync.Map{},
 		XLSX: map[string][]byte{
 			"charset": MacintoshCyrillicCharset,
 			"wsDr":    []byte(`<?xml version="1.0" encoding="UTF-8" standalone="yes"?><xdr:wsDr xmlns:xdr="http://schemas.openxmlformats.org/drawingml/2006/spreadsheetDrawing"><xdr:oneCellAnchor><xdr:graphicFrame/></xdr:oneCellAnchor></xdr:wsDr>`)},

excelize.go

@@ -39,7 +39,7 @@ type File struct {
 	CalcChain        *xlsxCalcChain
 	Comments         map[string]*xlsxComments
 	ContentTypes     *xlsxTypes
-	Drawings         map[string]*xlsxWsDr
+	Drawings         sync.Map
 	Path             string
 	SharedStrings    *xlsxSST
 	sharedStringsMap map[string]int
@@ -50,7 +50,7 @@ type File struct {
 	DecodeVMLDrawing map[string]*decodeVmlDrawing
 	VMLDrawing       map[string]*vmlDrawing
 	WorkBook         *xlsxWorkbook
-	Relationships    map[string]*xlsxRelationships
+	Relationships    sync.Map
 	XLSX             map[string][]byte
 	CharsetReader    charsetTranscoderFn
 }
@@ -93,12 +93,12 @@ func newFile() *File {
 		checked:          make(map[string]bool),
 		sheetMap:         make(map[string]string),
 		Comments:         make(map[string]*xlsxComments),
-		Drawings:         make(map[string]*xlsxWsDr),
+		Drawings:         sync.Map{},
 		sharedStringsMap: make(map[string]int),
 		Sheet:            make(map[string]*xlsxWorksheet),
 		DecodeVMLDrawing: make(map[string]*decodeVmlDrawing),
 		VMLDrawing:       make(map[string]*vmlDrawing),
-		Relationships:    make(map[string]*xlsxRelationships),
+		Relationships:    sync.Map{},
 		CharsetReader:    charset.NewReaderLabel,
 	}
 }
@@ -277,7 +277,7 @@ func (f *File) addRels(relPath, relType, target, targetMode string) int {
 		Target:     target,
 		TargetMode: targetMode,
 	})
-	f.Relationships[relPath] = rels
+	f.Relationships.Store(relPath, rels)
 	return rID
 }
 

excelize_test.go

@@ -975,7 +975,7 @@ func TestGetActiveSheetIndex(t *testing.T) {
 
 func TestRelsWriter(t *testing.T) {
 	f := NewFile()
-	f.Relationships["xl/worksheets/sheet/rels/sheet1.xml.rel"] = &xlsxRelationships{}
+	f.Relationships.Store("xl/worksheets/sheet/rels/sheet1.xml.rel", &xlsxRelationships{})
 	f.relsWriter()
 }
 
@@ -1231,7 +1231,7 @@ func TestRelsReader(t *testing.T) {
 	// Test unsupported charset.
 	f := NewFile()
 	rels := "xl/_rels/workbook.xml.rels"
-	f.Relationships[rels] = nil
+	f.Relationships.Store(rels, nil)
 	f.XLSX[rels] = MacintoshCyrillicCharset
 	f.relsReader(rels)
 }
@@ -1239,7 +1239,7 @@ func TestRelsReader(t *testing.T) {
 func TestDeleteSheetFromWorkbookRels(t *testing.T) {
 	f := NewFile()
 	rels := "xl/_rels/workbook.xml.rels"
-	f.Relationships[rels] = nil
+	f.Relationships.Store(rels, nil)
 	assert.Equal(t, f.deleteSheetFromWorkbookRels("rID"), "")
 }
 

file.go

@@ -17,6 +17,7 @@ import (
 	"fmt"
 	"io"
 	"os"
+	"sync"
 )
 
 // NewFile provides a function to create new file by default template. For
@@ -40,13 +41,13 @@ func NewFile() *File {
 	f.CalcChain = f.calcChainReader()
 	f.Comments = make(map[string]*xlsxComments)
 	f.ContentTypes = f.contentTypesReader()
-	f.Drawings = make(map[string]*xlsxWsDr)
+	f.Drawings = sync.Map{}
 	f.Styles = f.stylesReader()
 	f.DecodeVMLDrawing = make(map[string]*decodeVmlDrawing)
 	f.VMLDrawing = make(map[string]*vmlDrawing)
 	f.WorkBook = f.workbookReader()
-	f.Relationships = make(map[string]*xlsxRelationships)
-	f.Relationships["xl/_rels/workbook.xml.rels"] = f.relsReader("xl/_rels/workbook.xml.rels")
+	f.Relationships = sync.Map{}
+	f.Relationships.Store("xl/_rels/workbook.xml.rels", f.relsReader("xl/_rels/workbook.xml.rels"))
 	f.Sheet["xl/worksheets/sheet1.xml"], _ = f.workSheetReader("Sheet1")
 	f.sheetMap["Sheet1"] = "xl/worksheets/sheet1.xml"
 	f.Theme = f.themeReader()

picture.go

@@ -189,7 +189,7 @@ func (f *File) deleteSheetRelationships(sheet, rID string) {
 			sheetRels.Relationships = append(sheetRels.Relationships[:k], sheetRels.Relationships[k+1:]...)
 		}
 	}
-	f.Relationships[rels] = sheetRels
+	f.Relationships.Store(rels, sheetRels)
 }
 
 // addSheetLegacyDrawing provides a function to add legacy drawing element to
@@ -228,11 +228,12 @@ func (f *File) countDrawings() int {
 			c1++
 		}
 	}
-	for rel := range f.Drawings {
-		if strings.Contains(rel, "xl/drawings/drawing") {
+	f.Drawings.Range(func(rel, value interface{}) bool {
+		if strings.Contains(rel.(string), "xl/drawings/drawing") {
 			c2++
 		}
-	}
+		return true
+	})
 	if c1 < c2 {
 		return c2
 	}
@@ -296,7 +297,7 @@ func (f *File) addDrawingPicture(sheet, drawingXML, cell, file string, width, he
 		FPrintsWithSheet: formatSet.FPrintsWithSheet,
 	}
 	content.TwoCellAnchor = append(content.TwoCellAnchor, &twoCellAnchor)
-	f.Drawings[drawingXML] = content
+	f.Drawings.Store(drawingXML, content)
 	return err
 }
 
@@ -582,12 +583,13 @@ func (f *File) getDrawingRelationships(rels, rID string) *xlsxRelationship {
 // drawingsWriter provides a function to save xl/drawings/drawing%d.xml after
 // serialize structure.
 func (f *File) drawingsWriter() {
-	for path, d := range f.Drawings {
+	f.Drawings.Range(func(path, d interface{}) bool {
 		if d != nil {
-			v, _ := xml.Marshal(d)
-			f.saveFileList(path, v)
+			v, _ := xml.Marshal(d.(*xlsxWsDr))
+			f.saveFileList(path.(string), v)
 		}
-	}
+		return true
+	})
 }
 
 // drawingResize calculate the height and width after resizing.

shape.go

@@ -436,7 +436,7 @@ func (f *File) addDrawingShape(sheet, drawingXML, cell string, formatSet *format
 		FPrintsWithSheet: formatSet.Format.FPrintsWithSheet,
 	}
 	content.TwoCellAnchor = append(content.TwoCellAnchor, &twoCellAnchor)
-	f.Drawings[drawingXML] = content
+	f.Drawings.Store(drawingXML, content)
 	return err
 }
 

sheet.go

@@ -231,15 +231,16 @@ func (f *File) setWorkbook(name string, sheetID, rid int) {
 // relsWriter provides a function to save relationships after
 // serialize structure.
 func (f *File) relsWriter() {
-	for path, rel := range f.Relationships {
+	f.Relationships.Range(func(path, rel interface{}) bool {
 		if rel != nil {
-			output, _ := xml.Marshal(rel)
-			if strings.HasPrefix(path, "xl/worksheets/sheet/rels/sheet") {
-				output = f.replaceNameSpaceBytes(path, output)
+			output, _ := xml.Marshal(rel.(*xlsxRelationships))
+			if strings.HasPrefix(path.(string), "xl/worksheets/sheet/rels/sheet") {
+				output = f.replaceNameSpaceBytes(path.(string), output)
 			}
-			f.saveFileList(path, replaceRelationshipsBytes(output))
+			f.saveFileList(path.(string), replaceRelationshipsBytes(output))
 		}
-	}
+		return true
+	})
 }
 
 // setAppXML update docProps/app.xml file of XML.
@@ -359,22 +360,6 @@ func (f *File) SetSheetName(oldName, newName string) {
 	}
 }
 
-// getSheetNameByID provides a function to get worksheet name of the
-// spreadsheet by given worksheet ID. If given sheet ID is invalid, will
-// return an empty string.
-func (f *File) getSheetNameByID(ID int) string {
-	wb := f.workbookReader()
-	if wb == nil || ID < 1 {
-		return ""
-	}
-	for _, sheet := range wb.Sheets.Sheet {
-		if ID == sheet.SheetID {
-			return sheet.Name
-		}
-	}
-	return ""
-}
-
 // GetSheetName provides a function to get the sheet name of the workbook by
 // the given sheet index. If the given sheet index is invalid, it will return
 // an empty string.
@@ -541,7 +526,7 @@ func (f *File) DeleteSheet(name string) {
 			delete(f.sheetMap, sheetName)
 			delete(f.XLSX, sheetXML)
 			delete(f.XLSX, rels)
-			delete(f.Relationships, rels)
+			f.Relationships.Delete(rels)
 			delete(f.Sheet, sheetXML)
 			delete(f.xmlAttr, sheetXML)
 			f.SheetCount--
@@ -1727,8 +1712,8 @@ func (f *File) RemovePageBreak(sheet, cell string) (err error) {
 // after deserialization of xl/worksheets/_rels/sheet%d.xml.rels.
 func (f *File) relsReader(path string) *xlsxRelationships {
 	var err error
-
-	if f.Relationships[path] == nil {
+	rels, _ := f.Relationships.Load(path)
+	if rels == nil {
 		_, ok := f.XLSX[path]
 		if ok {
 			c := xlsxRelationships{}
@@ -1736,11 +1721,13 @@ func (f *File) relsReader(path string) *xlsxRelationships {
 				Decode(&c); err != nil && err != io.EOF {
 				log.Printf("xml decode error: %s", err)
 			}
-			f.Relationships[path] = &c
+			f.Relationships.Store(path, &c)
 		}
 	}
-
-	return f.Relationships[path]
+	if rels, _ = f.Relationships.Load(path); rels != nil {
+		return rels.(*xlsxRelationships)
+	}
+	return nil
 }
 
 // fillSheetData ensures there are enough rows, and columns in the chosen