Err  error     // Error returned by the remote peer for an rpc call
}

// A NotificationGroup is a collection of goroutines working on subtasks that are part of
// the same overall task.
//
// A zero NotificationGroup is valid and does not cancel on error.
type NotificationGroup struct {
	workers    *workers.Workers
	errs       []NotificationPeerErr
	retryCount int
}

	c := make(chan ioret[V], 1)
	go func() {
		v, err := work(ctx)
		c <- ioret[V]{val: v, err: err}
	}()

	select {
	case v := <-c:
		return v.val, v.err
	case <-ctx.Done():
		var zero V
		return zero, ctx.Err()
	}
}

// DeadlineWorker implements the deadline/timeout resiliency pattern.
type DeadlineWorker struct {
	timeout time.Duration
}

		i, test := i, test
		func() {
			defer recoverTest(i, test.ShouldPass, t)
			key := GenerateKey(test.ExtKey[:], test.Random)
			if [32]byte(key) == [32]byte{} {
				t.Errorf("Test %d: generated key is zero key", i) // check that we generate random and unique key
			}
		}()
	}
}

var generateIVTests = []struct {
	Random     io.Reader
	ShouldPass bool
}{
	{Random: nil, ShouldPass: true},              // 0

	if err == io.EOF && size != 0 {
		err = io.ErrUnexpectedEOF
	}
	if err != nil && err != io.EOF {
		cr.err = err
		return n, cr.err
	}

	// If the chunk size is zero we return io.EOF. As specified by AWS,
	// only the last chunk is zero-sized.
	if len(cr.buffer) == 0 {
		if cr.debug {
			fmt.Println("EOF")
		}
		if cr.trailers != nil {
			err = cr.readTrailers()
			if cr.debug {

		if publicKey == nil {
			w.Write([]byte{1})
			w.Write(key[:])
		}

		stream, err := sio.AES_256_GCM.Stream(key[:])
		if err != nil {
			bugLogIf(ctx, err)
			return
		}
		// Zero nonce, we only use each key once, and 32 bytes is plenty.
		nonce := make([]byte, stream.NonceSize())
		encw := stream.EncryptWriter(w, nonce, nil)
		defer encw.Close()

}

// Return shuffled partsMetadata depending on fi.Distribution.
// additional validation is attempted and invalid metadata is
// automatically skipped only when fi.ModTime is non-zero
// indicating that this is called during read-phase
func shuffleDisksAndPartsMetadata(disks []StorageAPI, partsMetadata []FileInfo, fi FileInfo) (shuffledDisks []StorageAPI, shuffledPartsMetadata []FileInfo) {

	"fmt"
	"testing"
)

// appropriate errors on validation
func TestInvalidExpiration(t *testing.T) {
	testCases := []struct {
		inputXML    string
		expectedErr error
	}{
		{ // Expiration with zero days
			inputXML: ` <Expiration>
                                    <Days>0</Days>
                                    </Expiration>`,
			expectedErr: errLifecycleInvalidDays,
		},
		{ // Expiration with invalid date

		}

		if err != nil && key != zeroKey {
			t.Errorf("Test %d: parsing failed and client key is not zero key", i)
		}
		if err == nil && key == zeroKey {
			t.Errorf("Test %d: parsed client key is zero key", i)
		}
	}
}

var ssecCopyParseTests = []struct {
	Header      http.Header
	ExpectedErr error
}{
	{
		Header: http.Header{

	}

	if len(labels)/2 != len(validLabels) {
		panic(fmt.Sprintf("not all labels were given values"))
	}

	v, ok := m.values[name]
	if !ok {
		v = make([]metricValue, 0, 1)
	}
	// If valid non zero value set the metrics
	if value > 0 {
		m.values[name] = append(v, metricValue{
			Labels: labelMap,
			Value:  value,
		})
	}
}

func (b BatchJobSnowball) Validate() error {
	if *b.Batch <= 0 {
		return BatchJobYamlErr{
			line: b.line,
			col:  b.col,
			msg:  "batch number should be non positive zero",
		}
	}
	_, err := humanize.ParseBytes(*b.SmallerThan)
	if err != nil {
		return BatchJobYamlErr{
			line: b.line,
			col:  b.col,
			msg:  err.Error(),
		}
	}
	return nil
}