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sqlserver.go
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sqlserver.go
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package sqlserver
import (
"database/sql"
"encoding/json"
"errors"
"fmt"
"math"
"net/url"
"path"
"path/filepath"
"sort"
"strings"
"time"
"github.com/johnalotoski/storages/storage"
"github.com/wal-g/tracelog"
"github.com/wal-g/wal-g/internal"
"github.com/wal-g/wal-g/internal/databases/sqlserver/blob"
"github.com/wal-g/wal-g/utility"
)
const AllDatabases = "ALL"
const LogNamePrefix = "wal_"
const TimeSQLServerFormat = "Jan 02, 2006 03:04:05 PM"
const MaxTransferSize = 4 * 1024 * 1024
const MaxBlocksPerBlob = 25000 // 50000 actually, but we need some safety margin
const MaxBlobSize = MaxTransferSize * MaxBlocksPerBlob
const BlobNamePrefix = "blob_"
var SystemDbnames = []string{
"master",
"msdb",
"model",
}
type SentinelDto struct {
Server string
Databases []string
StartLocalTime time.Time `json:"StartLocalTime,omitempty"`
StopLocalTime time.Time `json:"StopLocalTime,omitempty"`
}
func (s *SentinelDto) String() string {
b, err := json.Marshal(s)
if err != nil {
panic(err)
}
return string(b)
}
type DatabaseFile struct {
LogicalName string
PhysicalName string
Type string
FileID int
}
func getSQLServerConnection() (*sql.DB, error) {
connString, err := internal.GetRequiredSetting(internal.SQLServerConnectionString)
if err != nil {
return nil, err
}
db, err := sql.Open("sqlserver", connString)
if err != nil {
return nil, err
}
err = db.Ping()
if err != nil {
return nil, err
}
return db, nil
}
func getDatabasesToBackup(db *sql.DB, dbnames []string) ([]string, error) {
allDbnames, err := listDatabases(db)
if err != nil {
return nil, err
}
switch {
case len(dbnames) == 1 && dbnames[0] == AllDatabases:
return allDbnames, nil
case len(dbnames) > 0:
missing := exclude(dbnames, allDbnames)
if len(missing) > 0 {
return nil, fmt.Errorf("databases %v were not found in server", missing)
}
return dbnames, nil
default:
return exclude(allDbnames, SystemDbnames), nil
}
}
func getDatabasesToRestore(sentinel *SentinelDto, dbnames []string, fromnames []string) ([]string, []string, error) {
switch {
case len(dbnames) == 0:
if len(fromnames) != 0 {
return nil, nil, fmt.Errorf("--from param should be omitted when --databases is empty")
}
dbnames = exclude(sentinel.Databases, SystemDbnames)
fromnames = dbnames
case len(dbnames) == 1 && dbnames[0] == AllDatabases:
if len(fromnames) != 0 {
return nil, nil, fmt.Errorf("--from param should be omitted when --databases %s", AllDatabases)
}
dbnames = sentinel.Databases
fromnames = dbnames
default:
if len(fromnames) == 0 {
fromnames = dbnames
}
if len(fromnames) != len(dbnames) {
return nil, nil, fmt.Errorf("--from list length should match --databases list length")
}
missing := exclude(fromnames, sentinel.Databases)
if len(missing) > 0 {
return nil, nil, fmt.Errorf("databases %v were not found in backup", missing)
}
}
return dbnames, fromnames, nil
}
func listDatabases(db *sql.DB) ([]string, error) {
rows, err := db.Query("SELECT name FROM SYS.DATABASES WHERE name != 'tempdb'")
if err != nil {
return nil, err
}
defer rows.Close()
var names []string
for rows.Next() {
var name string
err := rows.Scan(&name)
if err != nil {
return nil, err
}
names = append(names, name)
}
return names, nil
}
func estimateSize(db *sql.DB, query string, args ...interface{}) (int64, int, error) {
var size int64
row := db.QueryRow(query, args...)
err := row.Scan(&size)
if err != nil {
return 0, 0, err
}
blobCount := int(math.Ceil(float64(size) / float64(MaxBlobSize)))
return size, blobCount, nil
}
func estimateDBSize(db *sql.DB, dbname string) (int64, int, error) {
query := fmt.Sprintf(`
USE %s;
SELECT (SELECT SUM(used_log_space_in_bytes) FROM sys.dm_db_log_space_usage)
+ (SELECT SUM(allocated_extent_page_count)*8*1024 FROM sys.dm_db_file_space_usage)
USE master;
`, quoteName(dbname))
return estimateSize(db, query)
}
func estimateLogSize(db *sql.DB, dbname string) (int64, int, error) {
query := fmt.Sprintf(`
USE %s;
SELECT SUM(log_space_in_bytes_since_last_backup) FROM sys.dm_db_log_space_usage;
USE master;
`, quoteName(dbname))
return estimateSize(db, query)
}
func listDatabaseFiles(db *sql.DB, urls string) ([]DatabaseFile, error) {
var res []DatabaseFile
query := fmt.Sprintf("RESTORE FILELISTONLY FROM %s", urls)
rows, err := db.Query(query)
if err != nil {
return nil, err
}
defer rows.Close()
for rows.Next() {
var dbf DatabaseFile
err = utility.ScanToMap(rows, map[string]interface{}{
"LogicalName": &dbf.LogicalName,
"PhysicalName": &dbf.PhysicalName,
"Type": &dbf.Type,
"FileId": &dbf.FileID,
})
if err != nil {
return nil, err
}
res = append(res, dbf)
}
return res, nil
}
func buildBackupUrls(baseURL string, blobCount int) string {
res := ""
for i := 0; i < blobCount; i++ {
if i > 0 {
res += ", "
}
blobName := fmt.Sprintf("%s%03d", BlobNamePrefix, i)
res += fmt.Sprintf("URL = '%s/%s'", baseURL, blobName)
}
return res
}
func buildRestoreUrls(baseURL string, blobNames []string) string {
if len(blobNames) == 0 {
// old-style single blob backup
return fmt.Sprintf("URL = '%s'", baseURL)
}
res := ""
for i, blobName := range blobNames {
if i > 0 {
res += ", "
}
res += fmt.Sprintf("URL = '%s/%s'", baseURL, blobName)
}
return res
}
func buildPhysicalFileMove(files []DatabaseFile, dbname string) (string, error) {
sort.Slice(files, func(i, j int) bool {
return files[i].FileID < files[j].FileID
})
res := ""
dataFileCnt := 0
logFileCnt := 0
for _, file := range files {
var newName string
switch file.Type {
case "D":
suffix := ""
if dataFileCnt > 0 {
suffix = fmt.Sprintf("_%d", dataFileCnt)
}
dataFileCnt++
ext := ".mdf"
if file.FileID > 1 {
ext = ".ndf"
}
newName = dbname + suffix + ext
case "L":
suffix := "_log"
if logFileCnt > 0 {
suffix = fmt.Sprintf("_log_%d", logFileCnt)
}
logFileCnt++
newName = dbname + suffix + ".ldf"
default:
return "", fmt.Errorf("unexpected backup file type: '%s'", file.Type)
}
newPhysicalName := filepath.Join(filepath.Dir(file.PhysicalName), newName)
if res != "" {
res += ", "
}
res += fmt.Sprintf("MOVE %s TO %s", quoteValue(file.LogicalName), quoteValue(newPhysicalName))
}
return res, nil
}
func quoteName(name string) string {
return "[" + strings.ReplaceAll(name, "]", "]]") + "]"
}
func quoteValue(val string) string {
return "'" + strings.ReplaceAll(val, "'", "''") + "'"
}
func generateDatabaseBackupName() string {
return utility.BackupNamePrefix + utility.TimeNowCrossPlatformUTC().Format(utility.BackupTimeFormat)
}
func getDatabaseBackupPath(backupName, dbname string) string {
return path.Join(utility.BaseBackupPath, backupName, dbname)
}
func getDatabaseBackupURL(backupName, dbname string) string {
hostname, err := internal.GetRequiredSetting(internal.SQLServerBlobHostname)
if err != nil {
tracelog.ErrorLogger.FatalOnError(err)
}
backupName = url.QueryEscape(backupName)
dbname = url.QueryEscape(dbname)
return fmt.Sprintf("https://%s/%s", hostname, getDatabaseBackupPath(backupName, dbname))
}
func generateLogBackupName() string {
return LogNamePrefix + utility.TimeNowCrossPlatformUTC().Format(utility.BackupTimeFormat)
}
func getLogBackupPath(logBackupName, dbname string) string {
return path.Join(utility.WalPath, logBackupName, dbname)
}
func getLogBackupURL(logBackupName, dbname string) string {
hostname, err := internal.GetRequiredSetting(internal.SQLServerBlobHostname)
if err != nil {
tracelog.ErrorLogger.FatalOnError(err)
}
logBackupName = url.QueryEscape(logBackupName)
dbname = url.QueryEscape(dbname)
return fmt.Sprintf("https://%s/%s", hostname, getLogBackupPath(logBackupName, dbname))
}
func doesLogBackupContainDB(folder storage.Folder, logBakupName string, dbname string) (bool, error) {
f := folder.GetSubFolder(utility.WalPath).GetSubFolder(logBakupName)
_, dbDirs, err := f.ListFolder()
if err != nil {
return false, err
}
for _, dbDir := range dbDirs {
if dbname == path.Base(dbDir.GetPath()) {
return true, nil
}
}
return false, nil
}
func listBackupBlobs(folder storage.Folder) ([]string, error) {
ok, err := folder.Exists(blob.IndexFileName)
if err != nil {
return nil, err
}
if ok {
// old-style single blob backup
return nil, nil
}
_, blobDirs, err := folder.ListFolder()
if err != nil {
return nil, err
}
var blobs []string
for _, blobDir := range blobDirs {
name := path.Base(blobDir.GetPath())
if strings.HasPrefix(name, BlobNamePrefix) {
blobs = append(blobs, name)
}
}
sort.Strings(blobs)
return blobs, nil
}
func getLogsSinceBackup(folder storage.Folder, backupName string, stopAt time.Time) ([]string, error) {
if !strings.HasPrefix(backupName, utility.BackupNamePrefix) {
return nil, fmt.Errorf("unexpected backup name: %s", backupName)
}
startTS := backupName[len(utility.BackupNamePrefix):]
endTS := stopAt.Format(utility.BackupTimeFormat)
_, logBackups, err := folder.GetSubFolder(utility.WalPath).ListFolder()
if err != nil {
return nil, err
}
var allLogNames []string
for _, logBackup := range logBackups {
allLogNames = append(allLogNames, path.Base(logBackup.GetPath()))
}
sort.Strings(allLogNames)
var logNames []string
for _, name := range allLogNames {
logTS := name[len(LogNamePrefix):]
if logTS < startTS {
continue
}
logNames = append(logNames, name)
if logTS > endTS {
break
}
}
return logNames, nil
}
func runParallel(f func(int) error, cnt int) error {
errs := make(chan error, cnt)
for i := 0; i < cnt; i++ {
go func(i int) {
errs <- f(i)
}(i)
}
var errStr string
for i := 0; i < cnt; i++ {
err := <-errs
if err != nil {
errStr += err.Error() + "\n"
}
}
if errStr != "" {
return errors.New(errStr)
}
return nil
}
func exclude(src, excl []string) []string {
var res []string
SRC:
for _, r := range src {
for _, r2 := range excl {
if r2 == r {
continue SRC
}
}
res = append(res, r)
}
return res
}
func uniq(src []string) []string {
res := make([]string, 0, len(src))
done := make(map[string]struct{}, len(src))
for _, s := range src {
if _, ok := done[s]; !ok {
res = append(res, s)
done[s] = struct{}{}
}
}
return res
}