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stream.go
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stream.go
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/*
Copyright The containerd Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package streaming
import (
"context"
"crypto/rand"
"encoding/base64"
"errors"
"fmt"
"io"
"sync"
"time"
transferapi "github.com/containerd/containerd/api/types/transfer"
"github.com/containerd/containerd/log"
"github.com/containerd/containerd/pkg/streaming"
"github.com/containerd/typeurl/v2"
)
const maxRead = 32 * 1024
const windowSize = 2 * maxRead
var bufPool = &sync.Pool{
New: func() interface{} {
buffer := make([]byte, maxRead)
return &buffer
},
}
func SendStream(ctx context.Context, r io.Reader, stream streaming.Stream) {
window := make(chan int32)
go func() {
defer close(window)
for {
select {
case <-ctx.Done():
return
default:
}
any, err := stream.Recv()
if err != nil {
if !errors.Is(err, io.EOF) && !errors.Is(err, context.Canceled) {
log.G(ctx).WithError(err).Error("send stream ended without EOF")
}
return
}
i, err := typeurl.UnmarshalAny(any)
if err != nil {
log.G(ctx).WithError(err).Error("failed to unmarshal stream object")
continue
}
switch v := i.(type) {
case *transferapi.WindowUpdate:
select {
case <-ctx.Done():
return
case window <- v.Update:
}
default:
log.G(ctx).Errorf("unexpected stream object of type %T", i)
}
}
}()
go func() {
defer stream.Close()
buf := bufPool.Get().(*[]byte)
defer bufPool.Put(buf)
var remaining int32
for {
if remaining > 0 {
// Don't wait for window update since there are remaining
select {
case <-ctx.Done():
// TODO: Send error message on stream before close to allow remote side to return error
return
case update := <-window:
remaining += update
default:
}
} else {
// Block until window updated
select {
case <-ctx.Done():
// TODO: Send error message on stream before close to allow remote side to return error
return
case update := <-window:
remaining = update
}
}
var max int32 = maxRead
if max > remaining {
max = remaining
}
b := (*buf)[:max]
n, err := r.Read(b)
if err != nil {
if !errors.Is(err, io.EOF) {
log.G(ctx).WithError(err).Errorf("failed to read stream source")
// TODO: Send error message on stream before close to allow remote side to return error
}
return
}
remaining = remaining - int32(n)
data := &transferapi.Data{
Data: b[:n],
}
any, err := typeurl.MarshalAny(data)
if err != nil {
log.G(ctx).WithError(err).Errorf("failed to marshal data for send")
// TODO: Send error message on stream before close to allow remote side to return error
return
}
if err := stream.Send(any); err != nil {
log.G(ctx).WithError(err).Errorf("send failed")
return
}
}
}()
}
func ReceiveStream(ctx context.Context, stream streaming.Stream) io.Reader {
r, w := io.Pipe()
go func() {
defer stream.Close()
var window int32
for {
var werr error
if window < windowSize {
update := &transferapi.WindowUpdate{
Update: windowSize,
}
any, err := typeurl.MarshalAny(update)
if err != nil {
w.CloseWithError(fmt.Errorf("failed to marshal window update: %w", err))
return
}
// check window update error after recv, stream may be complete
if werr = stream.Send(any); werr == nil {
window += windowSize
} else if errors.Is(werr, io.EOF) {
// TODO: Why does send return EOF here
werr = nil
}
}
any, err := stream.Recv()
if err != nil {
if errors.Is(err, io.EOF) || errors.Is(err, context.Canceled) {
err = nil
} else {
err = fmt.Errorf("received failed: %w", err)
}
w.CloseWithError(err)
return
} else if werr != nil {
// Try receive before erroring out
w.CloseWithError(fmt.Errorf("failed to send window update: %w", werr))
return
}
i, err := typeurl.UnmarshalAny(any)
if err != nil {
w.CloseWithError(fmt.Errorf("failed to unmarshal received object: %w", err))
return
}
switch v := i.(type) {
case *transferapi.Data:
n, err := w.Write(v.Data)
if err != nil {
w.CloseWithError(fmt.Errorf("failed to unmarshal received object: %w", err))
// Close will error out sender
return
}
window = window - int32(n)
// TODO: Handle error case
default:
log.G(ctx).Warnf("Ignoring unknown stream object of type %T", i)
continue
}
}
}()
return r
}
func GenerateID(prefix string) string {
t := time.Now()
var b [3]byte
rand.Read(b[:])
return fmt.Sprintf("%s-%d-%s", prefix, t.Nanosecond(), base64.URLEncoding.EncodeToString(b[:]))
}