// the string as a value that satisfies error of type tagging.Error
func Errorf(format string, a ...interface{}) error {
	return Error{err: fmt.Errorf(format, a...)}
}

// Unwrap the internal error.
func (e Error) Unwrap() error { return e.err }

// Error 'error' compatible method.
func (e Error) Error() string {
	if e.err == nil {
		return "replication: cause <nil>"
	}
	return e.err.Error()

	if isCompressed {
		wantEncryption := crypto.Requested(r.Header) || isEncrypted
		s2c, cb := newS2CompressReader(reader, actualPartSize, wantEncryption)
		idxCb = cb
		defer s2c.Close()
		reader = etag.Wrap(s2c, reader)
		length = -1
	}

	srcInfo.Reader, err = hash.NewReader(ctx, reader, length, "", "", actualPartSize)
	if err != nil {
		writeErrorResponse(ctx, w, toAPIError(ctx, err), r.URL)
		return
	}

	}()
	enc := json.NewEncoder(buf)
	err = enc.Encode(j.val)
	if err != nil {
		return b, err
	}
	return msgp.AppendBytes(b, buf.Bytes()), nil
}

// UnmarshalMsg will JSON marshal the value and wrap as a msgp byte array.
// Nil values are supported.
func (j *JSON[T]) UnmarshalMsg(bytes []byte) ([]byte, error) {
	if bytes, err := msgp.ReadNilBytes(bytes); err == nil {
		if j.val != nil {
			j.p.pool.Put(j.val)

			listenErrCallback(srv.Addrs[i], listenErrs[i])
		} else {
			interfaceFound = true
		}
	}
	if !interfaceFound {
		return nil, errors.New("no available interface found")
	}

	// Wrap given handler to do additional
	// * return 503 (service unavailable) if the server in shutdown.
	wrappedHandler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		// If server is in shutdown.

func diskHealthReader(ctx context.Context, r io.Reader) io.Reader {
	// Check if context has a disk health check.
	tracker, ok := ctx.Value(healthDiskCtxKey{}).(*healthDiskCtxValue)
	if !ok {
		// No need to wrap
		return r
	}
	return &diskHealthWrapper{r: r, tracker: tracker}
}

// diskHealthWriter provides a wrapper that will update disk health on
// ctx, on every successful write.

		wantEncryption := crypto.Requested(r.Header)
		s2c, cb := newS2CompressReader(reader, actualSize, wantEncryption)
		dstOpts.IndexCB = cb
		defer s2c.Close()
		reader = etag.Wrap(s2c, reader)
		length = -1
	} else {
		delete(srcInfo.UserDefined, ReservedMetadataPrefix+"compression")
		delete(srcInfo.UserDefined, ReservedMetadataPrefix+"actual-size")
		reader = gr
	}

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

package rest

import (
	"errors"
	"net"
	"net/url"
	"testing"
)

func TestNetworkError_Unwrap(t *testing.T) {
	tests := []struct {
		name   string
		err    error
		target interface{}
		want   bool
	}{
		{
			name:   "url.Error",

	now := UTCNow().Round(time.Millisecond)
	return PolicyDoc{
		Version:    1,
		Policy:     p,
		CreateDate: now,
		UpdateDate: now,
	}
}

// defaultPolicyDoc - used to wrap a default policy as PolicyDoc.
func defaultPolicyDoc(p policy.Policy) PolicyDoc {
	return PolicyDoc{
		Version: 1,
		Policy:  p,
	}
}

func (d *PolicyDoc) update(p policy.Policy) {

		}
		if r.size >= 0 && size >= 0 && r.size != size {
			return nil, SizeMismatch{Want: r.size, Got: size}
		}

		r.checksum = MD5
		r.contentSHA256 = SHA256
		if r.size < 0 && size >= 0 {
			r.src = etag.Wrap(ioutil.HardLimitReader(r.src, size), r.src)
			r.size = size
		}
		if r.actualSize <= 0 && actualSize >= 0 {
			r.actualSize = actualSize
		}
		return r, nil
	}

	if size >= 0 {

		handlerFlags |= flag
	}

	// Get name of the handler using reflection.
	handlerName := getHandlerName(f, "objectAPIHandlers")

	var handler http.HandlerFunc = func(w http.ResponseWriter, r *http.Request) {
		// Wrap the actual handler with the appropriate tracing middleware.
		var tracedHandler http.HandlerFunc
		if handlerFlags.has(traceHdrsS3HFlag) {
			tracedHandler = httpTraceHdrs(f)
		} else {
			tracedHandler = httpTraceAll(f)