forked from wal-g/wal-g
/
stream_fetch_helper.go
154 lines (133 loc) · 4.53 KB
/
stream_fetch_helper.go
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package internal
import (
"encoding/json"
"fmt"
"github.com/pkg/errors"
"io"
"sort"
"time"
"github.com/wal-g/storages/storage"
"github.com/tinsane/tracelog"
"github.com/wal-g/wal-g/internal/compression"
"github.com/wal-g/wal-g/utility"
)
type LogFetchSettings interface {
GetEndTS() (*time.Time, error)
GetDestFolderPath() (string, error)
GetLogFolderPath() string
}
type LogFetchHandlers interface {
GetLogFilePath(pathToLog string) (string, error)
ShouldBeAborted(pathToLog string) (bool, error)
DownloadLogTo(logFolder storage.Folder, logName string, dstLogFilePath string) error
HandleAbortFetch(string) error
}
func ParseTS(endTSEnvVar string) (endTS *time.Time, err error) {
endTSStr, ok := GetSetting(endTSEnvVar)
if ok {
t, err := time.Parse(time.RFC3339, endTSStr)
if err != nil {
return nil, err
}
endTS = &t
}
return endTS, nil
}
// GetLogsDstSettings reads from the environment variables fetch settings
func GetLogsDstSettings(operationLogsDstEnvVariable string) (dstFolder string, err error) {
dstFolder, ok := GetSetting(operationLogsDstEnvVariable)
if !ok {
return dstFolder, NewUnsetRequiredSettingError(operationLogsDstEnvVariable)
}
return dstFolder, nil
}
// DownloadAndDecompressStream downloads, decompresses and writes stream to stdout
func DownloadAndDecompressStream(backup *Backup, writeCloser io.WriteCloser) error {
for _, decompressor := range compression.Decompressors {
archiveReader, exists, err := TryDownloadWALFile(backup.BaseBackupFolder, getStreamName(backup.Name, decompressor.FileExtension()))
if err != nil {
return err
}
if !exists {
continue
}
err = DecompressWALFile(&EmptyWriteIgnorer{WriteCloser: writeCloser}, archiveReader, decompressor)
if err != nil {
return err
}
utility.LoggedClose(writeCloser, "")
return nil
}
return NewArchiveNonExistenceError(fmt.Sprintf("Archive '%s' does not exist.\n", backup.Name))
}
// GetLogsCoveringInterval lists the operation logs that cover the interval
func GetLogsCoveringInterval(folder storage.Folder, start time.Time, end *time.Time) ([]storage.Object, error) {
logFiles, _, err := folder.ListFolder()
if err != nil {
return nil, err
}
sort.Slice(logFiles, func(i, j int) bool {
return logFiles[i].GetLastModified().Before(logFiles[j].GetLastModified())
})
var logsToFetch []storage.Object
for _, logFile := range logFiles {
tracelog.InfoLogger.Println("Consider log file: ", logFile.GetName(), logFile.GetLastModified().Format(time.RFC3339))
if LogFileShouldBeFetched(start, end, logFile) {
logsToFetch = append(logsToFetch, logFile)
}
}
return logsToFetch, nil
}
// DownloadLogFiles downloads files to specified folder
func DownloadLogFiles(logFiles []storage.Object, logFolder storage.Folder, handlers LogFetchHandlers) ([]storage.Object, error) {
var fetched []storage.Object
for _, logFile := range logFiles {
logName := utility.TrimFileExtension(logFile.GetName())
logFilePath, err := handlers.GetLogFilePath(logName)
if err != nil {
return nil, err
}
tracelog.InfoLogger.Printf("Download %v to %v\n", logName, logFilePath)
err = handlers.DownloadLogTo(logFolder, logName, logFilePath)
if err != nil {
return nil, err
}
needAbortFetch, err := handlers.ShouldBeAborted(logFilePath)
if err != nil {
return nil, err
}
if needAbortFetch {
if err = handlers.HandleAbortFetch(logFilePath); err != nil {
return nil, err
}
return fetched, nil
}
fetched = append(fetched, logFile)
}
return fetched, nil
}
func FetchLogs(folder storage.Folder, startTS time.Time, endTS *time.Time, logFolderPath string, handlers LogFetchHandlers) (fetched []storage.Object, err error) {
logFolder := folder.GetSubFolder(logFolderPath)
logsToFetch, err := GetLogsCoveringInterval(logFolder, startTS, endTS)
if err != nil {
return nil, err
}
fetched, err = DownloadLogFiles(logsToFetch, logFolder, handlers)
if err != nil {
return nil, err
}
return fetched, nil
}
func LogFileShouldBeFetched(backupStartUploadTime time.Time, endTS *time.Time, object storage.Object) bool {
return (backupStartUploadTime.Before(object.GetLastModified()) || backupStartUploadTime.Equal(object.GetLastModified())) &&
(endTS == nil || (*endTS).After(object.GetLastModified()))
}
// TODO : unit tests
func FetchStreamSentinel(backup *Backup, sentinelDto interface{}) error {
sentinelDtoData, err := backup.FetchSentinelData()
if err != nil {
return errors.Wrap(err, "failed to fetch sentinel")
}
err = json.Unmarshal(sentinelDtoData, sentinelDto)
return errors.Wrap(err, "failed to unmarshal sentinel")
}