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import.go
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import.go
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// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
// See LICENSE.txt for license information.
package app
import (
"bufio"
"encoding/json"
"io"
"net/http"
"strings"
"sync"
"github.com/mattermost/mattermost-server/v5/mlog"
"github.com/mattermost/mattermost-server/v5/model"
)
const (
importMultiplePostsThreshold = 1000
maxScanTokenSize = 16 * 1024 * 1024 // Need to set a higher limit than default because some customers cross the limit. See MM-22314
)
func stopOnError(err LineImportWorkerError) bool {
if err.Error.Id == "api.file.upload_file.large_image.app_error" {
mlog.Warn("Large image import error", mlog.Err(err.Error))
return false
}
return true
}
func (a *App) bulkImportWorker(dryRun bool, wg *sync.WaitGroup, lines <-chan LineImportWorkerData, errors chan<- LineImportWorkerError) {
postLines := []LineImportWorkerData{}
directPostLines := []LineImportWorkerData{}
for line := range lines {
switch {
case line.LineImportData.Type == "post":
postLines = append(postLines, line)
if line.Post == nil {
errors <- LineImportWorkerError{model.NewAppError("BulkImport", "app.import.import_line.null_post.error", nil, "", http.StatusBadRequest), line.LineNumber}
}
if len(postLines) >= importMultiplePostsThreshold {
if errLine, err := a.importMultiplePostLines(postLines, dryRun); err != nil {
errors <- LineImportWorkerError{err, errLine}
}
postLines = []LineImportWorkerData{}
}
case line.LineImportData.Type == "direct_post":
directPostLines = append(directPostLines, line)
if line.DirectPost == nil {
errors <- LineImportWorkerError{model.NewAppError("BulkImport", "app.import.import_line.null_direct_post.error", nil, "", http.StatusBadRequest), line.LineNumber}
}
if len(directPostLines) >= importMultiplePostsThreshold {
if errLine, err := a.importMultipleDirectPostLines(directPostLines, dryRun); err != nil {
errors <- LineImportWorkerError{err, errLine}
}
directPostLines = []LineImportWorkerData{}
}
default:
if err := a.importLine(line.LineImportData, dryRun); err != nil {
errors <- LineImportWorkerError{err, line.LineNumber}
}
}
}
if len(postLines) > 0 {
if errLine, err := a.importMultiplePostLines(postLines, dryRun); err != nil {
errors <- LineImportWorkerError{err, errLine}
}
}
if len(directPostLines) > 0 {
if errLine, err := a.importMultipleDirectPostLines(directPostLines, dryRun); err != nil {
errors <- LineImportWorkerError{err, errLine}
}
}
wg.Done()
}
func (a *App) BulkImport(fileReader io.Reader, dryRun bool, workers int) (*model.AppError, int) {
scanner := bufio.NewScanner(fileReader)
buf := make([]byte, 0, 64*1024)
scanner.Buffer(buf, maxScanTokenSize)
lineNumber := 0
a.Srv().Store.LockToMaster()
defer a.Srv().Store.UnlockFromMaster()
errorsChan := make(chan LineImportWorkerError, (2*workers)+1) // size chosen to ensure it never gets filled up completely.
var wg sync.WaitGroup
var linesChan chan LineImportWorkerData
lastLineType := ""
for scanner.Scan() {
decoder := json.NewDecoder(strings.NewReader(scanner.Text()))
lineNumber++
var line LineImportData
if err := decoder.Decode(&line); err != nil {
return model.NewAppError("BulkImport", "app.import.bulk_import.json_decode.error", nil, err.Error(), http.StatusBadRequest), lineNumber
}
if lineNumber == 1 {
importDataFileVersion, appErr := processImportDataFileVersionLine(line)
if appErr != nil {
return appErr, lineNumber
}
if importDataFileVersion != 1 {
return model.NewAppError("BulkImport", "app.import.bulk_import.unsupported_version.error", nil, "", http.StatusBadRequest), lineNumber
}
lastLineType = line.Type
continue
}
if line.Type != lastLineType {
// Only clear the worker queue if is not the first data entry
if lineNumber != 2 {
// Changing type. Clear out the worker queue before continuing.
close(linesChan)
wg.Wait()
// Check no errors occurred while waiting for the queue to empty.
if len(errorsChan) != 0 {
err := <-errorsChan
if stopOnError(err) {
return err.Error, err.LineNumber
}
}
}
// Set up the workers and channel for this type.
lastLineType = line.Type
linesChan = make(chan LineImportWorkerData, workers)
for i := 0; i < workers; i++ {
wg.Add(1)
go a.bulkImportWorker(dryRun, &wg, linesChan, errorsChan)
}
}
select {
case linesChan <- LineImportWorkerData{line, lineNumber}:
case err := <-errorsChan:
if stopOnError(err) {
close(linesChan)
wg.Wait()
return err.Error, err.LineNumber
}
}
}
// No more lines. Clear out the worker queue before continuing.
if linesChan != nil {
close(linesChan)
}
wg.Wait()
// Check no errors occurred while waiting for the queue to empty.
if len(errorsChan) != 0 {
err := <-errorsChan
if stopOnError(err) {
return err.Error, err.LineNumber
}
}
if err := scanner.Err(); err != nil {
return model.NewAppError("BulkImport", "app.import.bulk_import.file_scan.error", nil, err.Error(), http.StatusInternalServerError), 0
}
return nil, 0
}
func processImportDataFileVersionLine(line LineImportData) (int, *model.AppError) {
if line.Type != "version" || line.Version == nil {
return -1, model.NewAppError("BulkImport", "app.import.process_import_data_file_version_line.invalid_version.error", nil, "", http.StatusBadRequest)
}
return *line.Version, nil
}
func (a *App) importLine(line LineImportData, dryRun bool) *model.AppError {
switch {
case line.Type == "scheme":
if line.Scheme == nil {
return model.NewAppError("BulkImport", "app.import.import_line.null_scheme.error", nil, "", http.StatusBadRequest)
}
return a.importScheme(line.Scheme, dryRun)
case line.Type == "team":
if line.Team == nil {
return model.NewAppError("BulkImport", "app.import.import_line.null_team.error", nil, "", http.StatusBadRequest)
}
return a.importTeam(line.Team, dryRun)
case line.Type == "channel":
if line.Channel == nil {
return model.NewAppError("BulkImport", "app.import.import_line.null_channel.error", nil, "", http.StatusBadRequest)
}
return a.importChannel(line.Channel, dryRun)
case line.Type == "user":
if line.User == nil {
return model.NewAppError("BulkImport", "app.import.import_line.null_user.error", nil, "", http.StatusBadRequest)
}
return a.importUser(line.User, dryRun)
case line.Type == "direct_channel":
if line.DirectChannel == nil {
return model.NewAppError("BulkImport", "app.import.import_line.null_direct_channel.error", nil, "", http.StatusBadRequest)
}
return a.importDirectChannel(line.DirectChannel, dryRun)
case line.Type == "emoji":
if line.Emoji == nil {
return model.NewAppError("BulkImport", "app.import.import_line.null_emoji.error", nil, "", http.StatusBadRequest)
}
return a.importEmoji(line.Emoji, dryRun)
default:
return model.NewAppError("BulkImport", "app.import.import_line.unknown_line_type.error", map[string]interface{}{"Type": line.Type}, "", http.StatusBadRequest)
}
}