mirror of
https://github.com/drakkan/sftpgo.git
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290 lines
9.3 KiB
Go
290 lines
9.3 KiB
Go
package common
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import (
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"errors"
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"os"
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"path"
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"sync"
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"sync/atomic"
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"time"
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"github.com/drakkan/sftpgo/dataprovider"
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"github.com/drakkan/sftpgo/logger"
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"github.com/drakkan/sftpgo/metrics"
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"github.com/drakkan/sftpgo/vfs"
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)
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var (
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// ErrTransferClosed defines the error returned for a closed transfer
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ErrTransferClosed = errors.New("transfer already closed")
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)
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// BaseTransfer contains protocols common transfer details for an upload or a download.
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type BaseTransfer struct { //nolint:maligned
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ID uint64
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Fs vfs.Fs
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File *os.File
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Connection *BaseConnection
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cancelFn func()
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fsPath string
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start time.Time
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transferType int
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MinWriteOffset int64
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InitialSize int64
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isNewFile bool
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requestPath string
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BytesSent int64
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BytesReceived int64
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MaxWriteSize int64
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AbortTransfer int32
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sync.Mutex
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ErrTransfer error
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}
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// NewBaseTransfer returns a new BaseTransfer and adds it to the given connection
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func NewBaseTransfer(file *os.File, conn *BaseConnection, cancelFn func(), fsPath, requestPath string, transferType int,
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minWriteOffset, initialSize, maxWriteSize int64, isNewFile bool, fs vfs.Fs) *BaseTransfer {
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t := &BaseTransfer{
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ID: conn.GetTransferID(),
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File: file,
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Connection: conn,
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cancelFn: cancelFn,
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fsPath: fsPath,
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start: time.Now(),
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transferType: transferType,
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MinWriteOffset: minWriteOffset,
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InitialSize: initialSize,
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isNewFile: isNewFile,
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requestPath: requestPath,
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BytesSent: 0,
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BytesReceived: 0,
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MaxWriteSize: maxWriteSize,
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AbortTransfer: 0,
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Fs: fs,
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}
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conn.AddTransfer(t)
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return t
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}
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// GetID returns the transfer ID
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func (t *BaseTransfer) GetID() uint64 {
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return t.ID
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}
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// GetType returns the transfer type
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func (t *BaseTransfer) GetType() int {
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return t.transferType
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}
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// GetSize returns the transferred size
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func (t *BaseTransfer) GetSize() int64 {
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if t.transferType == TransferDownload {
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return atomic.LoadInt64(&t.BytesSent)
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}
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return atomic.LoadInt64(&t.BytesReceived)
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}
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// GetStartTime returns the start time
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func (t *BaseTransfer) GetStartTime() time.Time {
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return t.start
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}
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// SignalClose signals that the transfer should be closed.
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// For same protocols, for example WebDAV, we have no
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// access to the network connection, so we use this method
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// to make the next read or write to fail
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func (t *BaseTransfer) SignalClose() {
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atomic.StoreInt32(&(t.AbortTransfer), 1)
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}
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// GetVirtualPath returns the transfer virtual path
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func (t *BaseTransfer) GetVirtualPath() string {
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return t.requestPath
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}
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// GetFsPath returns the transfer filesystem path
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func (t *BaseTransfer) GetFsPath() string {
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return t.fsPath
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}
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// GetRealFsPath returns the real transfer filesystem path.
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// If atomic uploads are enabled this differ from fsPath
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func (t *BaseTransfer) GetRealFsPath(fsPath string) string {
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if fsPath == t.GetFsPath() {
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if t.File != nil {
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return t.File.Name()
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}
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return t.fsPath
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}
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return ""
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}
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// SetCancelFn sets the cancel function for the transfer
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func (t *BaseTransfer) SetCancelFn(cancelFn func()) {
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t.cancelFn = cancelFn
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}
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// Truncate changes the size of the opened file.
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// Supported for local fs only
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func (t *BaseTransfer) Truncate(fsPath string, size int64) (int64, error) {
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if fsPath == t.GetFsPath() {
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if t.File != nil {
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initialSize := t.InitialSize
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err := t.File.Truncate(size)
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if err == nil {
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t.Lock()
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t.InitialSize = size
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if t.MaxWriteSize > 0 {
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sizeDiff := initialSize - size
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t.MaxWriteSize += sizeDiff
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metrics.TransferCompleted(atomic.LoadInt64(&t.BytesSent), atomic.LoadInt64(&t.BytesReceived), t.transferType, t.ErrTransfer)
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atomic.StoreInt64(&t.BytesReceived, 0)
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}
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t.Unlock()
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}
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t.Connection.Log(logger.LevelDebug, "file %#v truncated to size %v max write size %v new initial size %v err: %v",
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fsPath, size, t.MaxWriteSize, t.InitialSize, err)
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return initialSize, err
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}
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if size == 0 && atomic.LoadInt64(&t.BytesSent) == 0 {
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// for cloud providers the file is always truncated to zero, we don't support append/resume for uploads
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return 0, nil
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}
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return 0, ErrOpUnsupported
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}
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return 0, errTransferMismatch
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}
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// TransferError is called if there is an unexpected error.
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// For example network or client issues
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func (t *BaseTransfer) TransferError(err error) {
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t.Lock()
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defer t.Unlock()
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if t.ErrTransfer != nil {
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return
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}
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t.ErrTransfer = err
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if t.cancelFn != nil {
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t.cancelFn()
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}
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elapsed := time.Since(t.start).Nanoseconds() / 1000000
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t.Connection.Log(logger.LevelWarn, "Unexpected error for transfer, path: %#v, error: \"%v\" bytes sent: %v, "+
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"bytes received: %v transfer running since %v ms", t.fsPath, t.ErrTransfer, atomic.LoadInt64(&t.BytesSent),
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atomic.LoadInt64(&t.BytesReceived), elapsed)
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}
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// Close it is called when the transfer is completed.
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// It logs the transfer info, updates the user quota (for uploads)
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// and executes any defined action.
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// If there is an error no action will be executed and, in atomic mode,
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// we try to delete the temporary file
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func (t *BaseTransfer) Close() error {
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defer t.Connection.RemoveTransfer(t)
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var err error
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numFiles := 0
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if t.isNewFile {
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numFiles = 1
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}
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metrics.TransferCompleted(atomic.LoadInt64(&t.BytesSent), atomic.LoadInt64(&t.BytesReceived), t.transferType, t.ErrTransfer)
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if t.ErrTransfer == ErrQuotaExceeded && t.File != nil {
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// if quota is exceeded we try to remove the partial file for uploads to local filesystem
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err = os.Remove(t.File.Name())
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if err == nil {
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numFiles--
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atomic.StoreInt64(&t.BytesReceived, 0)
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t.MinWriteOffset = 0
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}
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t.Connection.Log(logger.LevelWarn, "upload denied due to space limit, delete temporary file: %#v, deletion error: %v",
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t.File.Name(), err)
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} else if t.transferType == TransferUpload && t.File != nil && t.File.Name() != t.fsPath {
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if t.ErrTransfer == nil || Config.UploadMode == UploadModeAtomicWithResume {
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err = os.Rename(t.File.Name(), t.fsPath)
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t.Connection.Log(logger.LevelDebug, "atomic upload completed, rename: %#v -> %#v, error: %v",
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t.File.Name(), t.fsPath, err)
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} else {
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err = os.Remove(t.File.Name())
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t.Connection.Log(logger.LevelWarn, "atomic upload completed with error: \"%v\", delete temporary file: %#v, "+
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"deletion error: %v", t.ErrTransfer, t.File.Name(), err)
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if err == nil {
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numFiles--
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atomic.StoreInt64(&t.BytesReceived, 0)
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t.MinWriteOffset = 0
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}
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}
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}
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elapsed := time.Since(t.start).Nanoseconds() / 1000000
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if t.transferType == TransferDownload {
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logger.TransferLog(downloadLogSender, t.fsPath, elapsed, atomic.LoadInt64(&t.BytesSent), t.Connection.User.Username,
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t.Connection.ID, t.Connection.protocol)
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action := newActionNotification(&t.Connection.User, operationDownload, t.fsPath, "", "", t.Connection.protocol,
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atomic.LoadInt64(&t.BytesSent), t.ErrTransfer)
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go actionHandler.Handle(action) //nolint:errcheck
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} else {
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fileSize := atomic.LoadInt64(&t.BytesReceived) + t.MinWriteOffset
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info, err := t.Fs.Stat(t.fsPath)
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if err == nil {
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fileSize = info.Size()
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}
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t.Connection.Log(logger.LevelDebug, "uploaded file size %v stat error: %v", fileSize, err)
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t.updateQuota(numFiles, fileSize)
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logger.TransferLog(uploadLogSender, t.fsPath, elapsed, atomic.LoadInt64(&t.BytesReceived), t.Connection.User.Username,
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t.Connection.ID, t.Connection.protocol)
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action := newActionNotification(&t.Connection.User, operationUpload, t.fsPath, "", "", t.Connection.protocol,
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fileSize, t.ErrTransfer)
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go actionHandler.Handle(action) //nolint:errcheck
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}
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if t.ErrTransfer != nil {
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t.Connection.Log(logger.LevelWarn, "transfer error: %v, path: %#v", t.ErrTransfer, t.fsPath)
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if err == nil {
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err = t.ErrTransfer
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}
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}
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return err
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}
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func (t *BaseTransfer) updateQuota(numFiles int, fileSize int64) bool {
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// S3 uploads are atomic, if there is an error nothing is uploaded
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if t.File == nil && t.ErrTransfer != nil {
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return false
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}
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sizeDiff := fileSize - t.InitialSize
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if t.transferType == TransferUpload && (numFiles != 0 || sizeDiff > 0) {
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vfolder, err := t.Connection.User.GetVirtualFolderForPath(path.Dir(t.requestPath))
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if err == nil {
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dataprovider.UpdateVirtualFolderQuota(vfolder.BaseVirtualFolder, numFiles, //nolint:errcheck
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sizeDiff, false)
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if vfolder.IsIncludedInUserQuota() {
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dataprovider.UpdateUserQuota(t.Connection.User, numFiles, sizeDiff, false) //nolint:errcheck
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}
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} else {
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dataprovider.UpdateUserQuota(t.Connection.User, numFiles, sizeDiff, false) //nolint:errcheck
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}
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return true
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}
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return false
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}
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// HandleThrottle manage bandwidth throttling
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func (t *BaseTransfer) HandleThrottle() {
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var wantedBandwidth int64
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var trasferredBytes int64
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if t.transferType == TransferDownload {
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wantedBandwidth = t.Connection.User.DownloadBandwidth
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trasferredBytes = atomic.LoadInt64(&t.BytesSent)
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} else {
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wantedBandwidth = t.Connection.User.UploadBandwidth
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trasferredBytes = atomic.LoadInt64(&t.BytesReceived)
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}
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if wantedBandwidth > 0 {
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// real and wanted elapsed as milliseconds, bytes as kilobytes
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realElapsed := time.Since(t.start).Nanoseconds() / 1000000
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// trasferredBytes / 1000 = KB/s, we multiply for 1000 to get milliseconds
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wantedElapsed := 1000 * (trasferredBytes / 1000) / wantedBandwidth
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if wantedElapsed > realElapsed {
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toSleep := time.Duration(wantedElapsed - realElapsed)
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time.Sleep(toSleep * time.Millisecond)
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}
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}
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}
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