import (
	"io"
	"sync"
)

// PipeWriter is similar to io.PipeWriter with wait group
type PipeWriter struct {
	*io.PipeWriter
	once sync.Once
	done func()
}

// CloseWithError close with supplied error the writer end.
func (w *PipeWriter) CloseWithError(err error) error {
	err = w.PipeWriter.CloseWithError(err)
	w.once.Do(func() {
		w.done()
	})
	return err
}

// PipeReader is similar to io.PipeReader with wait group

func (z *BatchJobExpire) EncodeMsg(en *msgp.Writer) (err error) {
	// map header, size 6
	// write "APIVersion"
	err = en.Append(0x86, 0xaa, 0x41, 0x50, 0x49, 0x56, 0x65, 0x72, 0x73, 0x69, 0x6f, 0x6e)
	if err != nil {
		return
	}
	err = en.WriteString(z.APIVersion)
	if err != nil {
		err = msgp.WrapError(err, "APIVersion")
		return
	}
	// write "Bucket"
	err = en.Append(0xa6, 0x42, 0x75, 0x63, 0x6b, 0x65, 0x74)

  @Override
  @J2ktIncompatible // serialization
  @GwtIncompatible // serialization
  Object writeReplace() {
    return super.writeReplace();
  }

  // No longer used for new writes, but kept so that old data can still be read.
  @GwtIncompatible // serialization
  @J2ktIncompatible
  @SuppressWarnings("unused")
  private static class KeySetSerializedForm<K> implements Serializable {

// along with this program.  If not, see <http://www.gnu.org/licenses/>.

package cmd

import (
	"context"
	"net/http"
	"net/url"
)

// Writes S3 compatible copy part range error.
func writeCopyPartErr(ctx context.Context, w http.ResponseWriter, err error, url *url.URL) {
	switch err {
	case errInvalidRange:

// WriterArgs - represents elements inside <OutputSerialization><JSON/> in request XML.
type WriterArgs struct {
	RecordDelimiter string `xml:"RecordDelimiter"`
	unmarshaled     bool
}

// IsEmpty - returns whether writer args is empty or not.
func (args *WriterArgs) IsEmpty() bool {
	return !args.unmarshaled
}

// UnmarshalXML - decodes XML data.
func (args *WriterArgs) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {

Dazu verwenden Sie den `TestClient` in einer `with`-Anweisung, eine Verbindung zum WebSocket herstellend:

```Python hl_lines="27-31"
{!../../docs_src/app_testing/tutorial002.py!}
```

/// note | "Hinweis"

Weitere Informationen finden Sie in der Starlette-Dokumentation zum <a href="https://www.starlette.io/testclient/#testing-websocket-sessions" class="external-link" target="_blank">Testen von WebSockets</a>.

Hier ist eine kleine Vorschau, wie Sie Strawberry mit FastAPI integrieren können:

```Python hl_lines="3  22  25-26"
{!../../docs_src/graphql/tutorial001.py!}
```

Weitere Informationen zu Strawberry finden Sie in der <a href="https://strawberry.rocks/" class="external-link" target="_blank">Strawberry-Dokumentation</a>.

package main

import (
	"encoding/binary"
	"encoding/hex"
	"fmt"
	"hash/crc32"
	"io"

	"github.com/secure-io/sio-go"
)

func extractInspectV1(keyHex string, r io.Reader, w io.Writer, okMsg string) error {
	id, err := hex.DecodeString(keyHex[:8])
	if err != nil {
		return err
	}
	key, err := hex.DecodeString(keyHex[8:])
	if err != nil {
		return err
	}
	// Verify that CRC is ok.

}

// EncodeMsg implements msgp.Encodable
func (z *nsScannerOptions) EncodeMsg(en *msgp.Writer) (err error) {
	// map header, size 3
	// write "id"
	err = en.Append(0x83, 0xa2, 0x69, 0x64)
	if err != nil {
		return
	}
	err = en.WriteString(z.DiskID)
	if err != nil {
		err = msgp.WrapError(err, "DiskID")
		return
	}
	// write "m"
	err = en.Append(0xa1, 0x6d)
	if err != nil {
		return
	}

    assertThat(bodyToHex(body), "Retransmit body").isEqualTo("48656c6c6f")
  }

  @Test
  fun file() {
    val file = File.createTempFile("RequestTest", "tmp")
    val writer = FileWriter(file)
    writer.write("abc")
    writer.close()
    val contentType = "text/plain".toMediaType()
    val body: RequestBody = file.asRequestBody(contentType)
    assertThat(body.contentType()).isEqualTo(contentType)