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Allow peeking back further in buffer.

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This commit is contained in:
Brian Brazil 2017-05-23 17:01:54 +01:00
parent 10d8b6b633
commit c02c25d5ba
3 changed files with 10 additions and 10 deletions
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2
promql/engine.go
View File

@ -752,7 +752,7 @@ func (ev *evaluator) vectorSelector(node *VectorSelector) Vector {
t, v := it.Values()
if !ok || t > refTime {
t, v, ok = it.PeekBack()
t, v, ok = it.PeekBack(1)
if !ok || t < refTime-durationMilliseconds(StalenessDelta) {
continue
}

16
storage/buffer.go
View File

@ -36,10 +36,10 @@ func NewBuffer(it SeriesIterator, delta int64) *BufferedSeriesIterator {
return bit
}
// PeekBack returns the previous element of the iterator. If there is none buffered,
// PeekBack returns the nth previous element of the iterator. If there is none buffered,
// ok is false.
func (b *BufferedSeriesIterator) PeekBack() (t int64, v float64, ok bool) {
return b.buf.last()
func (b *BufferedSeriesIterator) PeekBack(n int) (t int64, v float64, ok bool) {
return b.buf.nthLast(n)
}
// Buffer returns an iterator over the buffered data.
@ -189,13 +189,13 @@ func (r *sampleRing) add(t int64, v float64) {
}
}
// last returns the most recent element added to the ring.
func (r *sampleRing) last() (int64, float64, bool) {
if r.l == 0 {
// nthLast returns the nth most recent element added to the ring.
func (r *sampleRing) nthLast(n int) (int64, float64, bool) {
if n > r.l {
return 0, 0, false
}
s := r.buf[r.i]
return s.t, s.v, true
t, v := r.at(r.l - n)
return t, v, true
}
func (r *sampleRing) samples() []sample {

2
web/federate.go
View File

@ -94,7 +94,7 @@ func (h *Handler) federation(w http.ResponseWriter, req *http.Request) {
if ok {
t, v = it.Values()
} else {
t, v, ok = it.PeekBack()
t, v, ok = it.PeekBack(0)
if !ok {
continue
}