storage/buffer.go [168:208]:
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type sampleRingIterator struct {
	r *sampleRing
	i int
}

func (it *sampleRingIterator) Next() bool {
	it.i++
	return it.i < it.r.l
}

func (it *sampleRingIterator) Seek(int64) bool {
	return false
}

func (it *sampleRingIterator) Err() error {
	return nil
}

func (it *sampleRingIterator) At() (int64, float64) {
	return it.r.at(it.i)
}

func (r *sampleRing) at(i int) (int64, float64) {
	j := (r.f + i) % len(r.buf)
	s := r.buf[j]
	return s.t, s.v
}

// add adds a sample to the ring buffer and frees all samples that fall
// out of the delta range.
func (r *sampleRing) add(t int64, v float64) {
	l := len(r.buf)
	// Grow the ring buffer if it fits no more elements.
	if l == r.l {
		buf := make([]sample, 2*l)
		copy(buf[l+r.f:], r.buf[r.f:])
		copy(buf, r.buf[:r.f])

		r.buf = buf
		r.i = r.f
		r.f += l
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tsdb/tsdbutil/buffer.go [152:192]:
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type sampleRingIterator struct {
	r *sampleRing
	i int
}

func (it *sampleRingIterator) Next() bool {
	it.i++
	return it.i < it.r.l
}

func (it *sampleRingIterator) Seek(int64) bool {
	return false
}

func (it *sampleRingIterator) Err() error {
	return nil
}

func (it *sampleRingIterator) At() (int64, float64) {
	return it.r.at(it.i)
}

func (r *sampleRing) at(i int) (int64, float64) {
	j := (r.f + i) % len(r.buf)
	s := r.buf[j]
	return s.t, s.v
}

// add adds a sample to the ring buffer and frees all samples that fall
// out of the delta range.
func (r *sampleRing) add(t int64, v float64) {
	l := len(r.buf)
	// Grow the ring buffer if it fits no more elements.
	if l == r.l {
		buf := make([]sample, 2*l)
		copy(buf[l+r.f:], r.buf[r.f:])
		copy(buf, r.buf[:r.f])

		r.buf = buf
		r.i = r.f
		r.f += l
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