[MM-57078] Adding progress logs for attachments to bulk export job (#26396)

* adding progress logs to export job
---------
Co-authored-by: Mattermost Build <build@mattermost.com>

server/channels/app/export.go

@@ -138,26 +138,33 @@ func (a *App) BulkExport(ctx request.CTX, writer io.Writer, outPath string, job
 
 	if opts.IncludeAttachments {
 		ctx.Logger().Info("Bulk export: exporting file attachments")
-		for _, attachment := range attachments {
-			if err := a.exportFile(outPath, *attachment.Path, zipWr); err != nil {
-				return err
-			}
+		if err = a.exportAttachments(ctx, attachments, outPath, zipWr); err != nil {
+			return err
 		}
-		for _, attachment := range directAttachments {
-			if err := a.exportFile(outPath, *attachment.Path, zipWr); err != nil {
-				return err
-			}
+
+		ctx.Logger().Info("Bulk export: exporting direct file attachments")
+		if err = a.exportAttachments(ctx, directAttachments, outPath, zipWr); err != nil {
+			return err
 		}
+
+		totalExportedEmojis := 0
+		emojisLen := len(emojiPaths)
+		ctx.Logger().Info("Bulk export: exporting custom emojis")
 		for _, emojiPath := range emojiPaths {
 			if err := a.exportFile(outPath, emojiPath, zipWr); err != nil {
 				return err
 			}
+			totalExportedEmojis++
+			if totalExportedEmojis%10 == 0 {
+				ctx.Logger().Info("Bulk export: exporting emojis progress", mlog.Int("total_successfully_exported_emojis", totalExportedEmojis), mlog.Int("total_emojis_to_export", emojisLen))
+			}
 		}
 
 		updateJobProgress(ctx.Logger(), a.Srv().Store(), job, "attachments_exported", len(attachments)+len(directAttachments)+len(emojiPaths))
 	}
 
 	if opts.IncludeProfilePictures {
+		ctx.Logger().Info("Bulk export: exporting profile pictures")
 		for _, profilePicture := range profilePictures {
 			if err := a.exportFile(outPath, profilePicture, zipWr); err != nil {
 				ctx.Logger().Warn("Unable to export profile picture", mlog.String("profile_picture", profilePicture), mlog.Err(err))
@@ -169,6 +176,21 @@ func (a *App) BulkExport(ctx request.CTX, writer io.Writer, outPath string, job
 	return nil
 }
 
+func (a *App) exportAttachments(ctx request.CTX, attachments []imports.AttachmentImportData, outPath string, zipWr *zip.Writer) *model.AppError {
+	totalExportedFiles := 0
+	attachmentsLen := len(attachments)
+	for _, attachment := range attachments {
+		if err := a.exportFile(outPath, *attachment.Path, zipWr); err != nil {
+			return err
+		}
+		totalExportedFiles++
+		if totalExportedFiles%10 == 0 {
+			ctx.Logger().Info("Bulk export: exporting file attachments progress", mlog.Int("total_successfully_exported_files", totalExportedFiles), mlog.Int("total_files_to_export", attachmentsLen))
+		}
+	}
+	return nil
+}
+
 func (a *App) exportWriteLine(w io.Writer, line *imports.LineImportData) *model.AppError {
 	b, err := json.Marshal(line)
 	if err != nil {