type disconnectReader struct {
	r  io.Reader
	mu sync.Mutex
}

func (d *disconnectReader) Read(p []byte) (n int, err error) {
	d.mu.Lock()
	defer d.mu.Unlock()
	if d.r != nil {
		return d.r.Read(p)
	}
	return 0, errors.New("reader closed")
}

func (d *disconnectReader) Close() error {
	d.mu.Lock()
	d.r = nil
	d.mu.Unlock()
	return nil
}

   * data, and vertical if there is variance in the {@code y} data but not the {@code x} data.
   *
   * <p>This fit minimizes the root-mean-square error in {@code y} as a function of {@code x}. This
   * error is defined as the square root of the mean of the squares of the differences between the
   * actual {@code y} values of the data and the values predicted by the fit for the {@code x}

        status_code=HTTP_422_UNPROCESSABLE_ENTITY,
        content={"detail": jsonable_encoder(exc.errors())},
    )


async def websocket_request_validation_exception_handler(
    websocket: WebSocket, exc: WebSocketRequestValidationError
) -> None:
    await websocket.close(
        code=WS_1008_POLICY_VIOLATION, reason=jsonable_encoder(exc.errors())

	if info.Free > info.Total {
		return info, fmt.Errorf("detected free space (%d) > total drive space (%d), fs corruption at (%s). please run 'fsck'", info.Free, info.Total, path)
	}
	info.Used = info.Total - info.Free
	return info, nil
}

// GetDriveStats returns IO stats of the drive by its major:minor
func GetDriveStats(major, minor uint32) (iostats IOStats, err error) {
	return IOStats{}, errors.New("operation unsupported")

	user := User{Name: "jinzhu", Account: Account{Number: "1"}}

	if err := DB.Create(&user).Error; err != nil {
		t.Fatalf("errors happened when create: %v", err)
	}

	if err := DB.Model(&user).Association("Languages").Replace(Account{Number: "2"}); err == nil {
		t.Error("expected association error to be not nil")
	}

	}
	sm.p99Latency = p99Latency

	if me.ErrorOrNil() != nil {
		return sm, fmt.Errorf("error retrieving some metrics: %v", me.Error())
	}

	return sm, nil
}

func getLatency(promAPI promv1.API, workloadName, workloadNamespace string, duration time.Duration, quantile float64) (time.Duration, error) {

// BatchJobYamlErr can be used to return yaml validation errors with line,
// column information guiding user to fix syntax errors
type BatchJobYamlErr struct {
	line, col int
	msg       string
}

// message returns the error message excluding line, col information.
// Intended to be used in unit tests.
func (b BatchJobYamlErr) message() string {
	return b.msg
}

// Error implements Error interface
func (b BatchJobYamlErr) Error() string {

		logger.Fatal(err, "Failed to connect to KMS")
	}

	if _, err = KMS.GenerateKey(GlobalContext, &kms.GenerateKeyRequest{}); errors.Is(err, kms.ErrKeyNotFound) {
		err = KMS.CreateKey(GlobalContext, &kms.CreateKeyRequest{Name: KMS.DefaultKey})
	}
	if err != nil && !errors.Is(err, kms.ErrKeyExists) && !errors.Is(err, kms.ErrPermission) {
		logger.Fatal(err, "Failed to connect to KMS")
	}
	GlobalKMS = KMS
}

}

func (db *PreparedStmtDB) Ping() error {
	conn, err := db.GetDBConn()
	if err != nil {
		return err
	}
	return conn.Ping()
}

type PreparedStmtTX struct {
	Tx
	PreparedStmtDB *PreparedStmtDB
}

func (db *PreparedStmtTX) GetDBConn() (*sql.DB, error) {
	return db.PreparedStmtDB.GetDBConn()
}

func (tx *PreparedStmtTX) Commit() error {

var (
	defaultKeyFunc = func(claim *MapClaims) ([]byte, error) { return []byte("HelloSecret"), nil }
	emptyKeyFunc   = func(claim *MapClaims) ([]byte, error) { return nil, nil }
	errorKeyFunc   = func(claim *MapClaims) ([]byte, error) { return nil, fmt.Errorf("error loading key") }
)

var jwtTestData = []struct {
	name        string
	tokenString string
	keyfunc     func(*MapClaims) ([]byte, error)
	claims      jwt.Claims
	valid       bool