[MM-13033] Continue bulk import on large image error (#10780)

* [MM-13033] Continue bulk import on large image error

* add tests, review comments

* Update app/import_functions.go

Co-Authored-By: liusy182 <liusy182@hotmail.com>

app/import.go

@@ -6,14 +6,25 @@ package app
 import (
 	"bufio"
 	"encoding/json"
+	"fmt"
 	"io"
 	"net/http"
 	"strings"
 	"sync"
 
+	"github.com/mattermost/mattermost-server/mlog"
+
 	"github.com/mattermost/mattermost-server/model"
 )
 
+func stopOnError(err LineImportWorkerError) bool {
+	if err.Error.Id == "api.file.upload_file.large_image.app_error" {
+		mlog.Warn(fmt.Sprintf("Large image import error: %s", err.Error.Error()))
+		return false
+	}
+	return true
+}
+
 func (a *App) bulkImportWorker(dryRun bool, wg *sync.WaitGroup, lines <-chan LineImportWorkerData, errors chan<- LineImportWorkerError) {
 	for line := range lines {
 		if err := a.ImportLine(line.LineImportData, dryRun); err != nil {
@@ -65,7 +76,9 @@ func (a *App) BulkImport(fileReader io.Reader, dryRun bool, workers int) (*model
 				// Check no errors occurred while waiting for the queue to empty.
 				if len(errorsChan) != 0 {
 					err := <-errorsChan
-					return err.Error, err.LineNumber
+					if stopOnError(err) {
+						return err.Error, err.LineNumber
+					}
 				}
 			}
 
@@ -81,9 +94,11 @@ func (a *App) BulkImport(fileReader io.Reader, dryRun bool, workers int) (*model
 		select {
 		case linesChan <- LineImportWorkerData{line, lineNumber}:
 		case err := <-errorsChan:
-			close(linesChan)
-			wg.Wait()
-			return err.Error, err.LineNumber
+			if stopOnError(err) {
+				close(linesChan)
+				wg.Wait()
+				return err.Error, err.LineNumber
+			}
 		}
 	}
 
@@ -94,7 +109,9 @@ func (a *App) BulkImport(fileReader io.Reader, dryRun bool, workers int) (*model
 	// Check no errors occurred while waiting for the queue to empty.
 	if len(errorsChan) != 0 {
 		err := <-errorsChan
-		return err.Error, err.LineNumber
+		if stopOnError(err) {
+			return err.Error, err.LineNumber
+		}
 	}
 
 	if err := scanner.Err(); err != nil {