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package filesync
import (
"bufio"
"context"
io "io"
"os"
"time"
"github.com/moby/buildkit/util/bklog"
"github.com/pkg/errors"
"github.com/tonistiigi/fsutil"
fstypes "github.com/tonistiigi/fsutil/types"
"google.golang.org/grpc"
)
type Stream interface {
Context() context.Context
SendMsg(m interface{}) error
RecvMsg(m interface{}) error
}
func newStreamWriter(stream grpc.ClientStream) io.WriteCloser {
wc := &streamWriterCloser{ClientStream: stream}
return &bufferedWriteCloser{Writer: bufio.NewWriter(wc), Closer: wc}
}
type bufferedWriteCloser struct {
*bufio.Writer
io.Closer
}
func (bwc *bufferedWriteCloser) Close() error {
if err := bwc.Writer.Flush(); err != nil {
return errors.WithStack(err)
}
return bwc.Closer.Close()
}
type streamWriterCloser struct {
grpc.ClientStream
}
func (wc *streamWriterCloser) Write(dt []byte) (int, error) {
// grpc-go has a 4MB limit on messages by default. Split large messages
// so we don't get close to that limit.
const maxChunkSize = 3 * 1024 * 1024
if len(dt) > maxChunkSize {
n1, err := wc.Write(dt[:maxChunkSize])
if err != nil {
return n1, err
}
dt = dt[maxChunkSize:]
var n2 int
if n2, err = wc.Write(dt); err != nil {
return n1 + n2, err
}
return n1 + n2, nil
}
if err := wc.ClientStream.SendMsg(&BytesMessage{Data: dt}); err != nil {
// SendMsg return EOF on remote errors
if errors.Is(err, io.EOF) {
if err := errors.WithStack(wc.ClientStream.RecvMsg(struct{}{})); err != nil {
return 0, err
}
}
return 0, errors.WithStack(err)
}
return len(dt), nil
}
func (wc *streamWriterCloser) Close() error {
if err := wc.ClientStream.CloseSend(); err != nil {
return errors.WithStack(err)
}
// block until receiver is done
var bm BytesMessage
if err := wc.ClientStream.RecvMsg(&bm); err != io.EOF {
return errors.WithStack(err)
}
return nil
}
func recvDiffCopy(ds grpc.ClientStream, dest string, cu CacheUpdater, progress progressCb, differ fsutil.DiffType, filter func(string, *fstypes.Stat) bool) (err error) {
st := time.Now()
defer func() {
bklog.G(ds.Context()).Debugf("diffcopy took: %v", time.Since(st))
}()
var cf fsutil.ChangeFunc
var ch fsutil.ContentHasher
if cu != nil {
cu.MarkSupported(true)
cf = cu.HandleChange
ch = cu.ContentHasher()
}
defer func() {
// tracing wrapper requires close trigger even on clean eof
if err == nil {
ds.CloseSend()
}
}()
return errors.WithStack(fsutil.Receive(ds.Context(), ds, dest, fsutil.ReceiveOpt{
NotifyHashed: cf,
ContentHasher: ch,
ProgressCb: progress,
Filter: fsutil.FilterFunc(filter),
Differ: differ,
}))
}
func syncTargetDiffCopy(ds grpc.ServerStream, dest string) error {
if err := os.MkdirAll(dest, 0700); err != nil {
return errors.Wrapf(err, "failed to create synctarget dest dir %s", dest)
}
return errors.WithStack(fsutil.Receive(ds.Context(), ds, dest, fsutil.ReceiveOpt{
Merge: true,
Filter: func() func(string, *fstypes.Stat) bool {
uid := os.Getuid()
gid := os.Getgid()
return func(p string, st *fstypes.Stat) bool {
st.Uid = uint32(uid)
st.Gid = uint32(gid)
return true
}
}(),
}))
}
func writeTargetFile(ds grpc.ServerStream, wc io.WriteCloser) error {
for {
bm := BytesMessage{}
if err := ds.RecvMsg(&bm); err != nil {
if errors.Is(err, io.EOF) {
return nil
}
return errors.WithStack(err)
}
if _, err := wc.Write(bm.Data); err != nil {
return errors.WithStack(err)
}
}
}
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