mirror of
https://github.com/prometheus/prometheus.git
synced 2024-09-20 15:57:31 -07:00
Move BufferedSeriesIterator in own package
This functionality is useful for a lot of clients but not relevant to the TSDB's core features.
This commit is contained in:
Fabian Reinartz
parent
e478d0e3bc
commit
f85d89abc0
197
querier.go
197
querier.go
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@ -2,7 +2,6 @@ package tsdb
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import (
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"fmt"
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"math"
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"sort"
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"strings"
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@ -605,202 +604,6 @@ func (it *chunkSeriesIterator) Err() error {
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return it.cur.Err()
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}
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// BufferedSeriesIterator wraps an iterator with a look-back buffer.
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type BufferedSeriesIterator struct {
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it SeriesIterator
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buf *sampleRing
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lastTime int64
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}
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// NewBuffer returns a new iterator that buffers the values within the time range
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// of the current element and the duration of delta before.
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func NewBuffer(it SeriesIterator, delta int64) *BufferedSeriesIterator {
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return &BufferedSeriesIterator{
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it: it,
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buf: newSampleRing(delta, 16),
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lastTime: math.MinInt64,
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}
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}
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// PeekBack returns the previous element of the iterator. If there is none buffered,
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// ok is false.
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func (b *BufferedSeriesIterator) PeekBack() (t int64, v float64, ok bool) {
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return b.buf.last()
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}
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// Buffer returns an iterator over the buffered data.
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func (b *BufferedSeriesIterator) Buffer() SeriesIterator {
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return b.buf.iterator()
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}
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// Seek advances the iterator to the element at time t or greater.
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func (b *BufferedSeriesIterator) Seek(t int64) bool {
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t0 := t - b.buf.delta
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// If the delta would cause us to seek backwards, preserve the buffer
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// and just continue regular advancment while filling the buffer on the way.
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if t0 > b.lastTime {
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b.buf.reset()
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ok := b.it.Seek(t0)
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if !ok {
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return false
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}
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b.lastTime, _ = b.At()
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}
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if b.lastTime >= t {
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return true
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}
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for b.Next() {
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if b.lastTime >= t {
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return true
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}
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}
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return false
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}
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// Next advances the iterator to the next element.
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func (b *BufferedSeriesIterator) Next() bool {
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// Add current element to buffer before advancing.
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b.buf.add(b.it.At())
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ok := b.it.Next()
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if ok {
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b.lastTime, _ = b.At()
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}
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return ok
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}
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// At returns the current element of the iterator.
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func (b *BufferedSeriesIterator) At() (int64, float64) {
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return b.it.At()
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}
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// Err returns the last encountered error.
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func (b *BufferedSeriesIterator) Err() error {
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return b.it.Err()
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}
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type sample struct {
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t int64
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v float64
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}
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type sampleRing struct {
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delta int64
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buf []sample // lookback buffer
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i int // position of most recent element in ring buffer
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f int // position of first element in ring buffer
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l int // number of elements in buffer
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}
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func newSampleRing(delta int64, sz int) *sampleRing {
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r := &sampleRing{delta: delta, buf: make([]sample, sz)}
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r.reset()
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return r
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}
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func (r *sampleRing) reset() {
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r.l = 0
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r.i = -1
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r.f = 0
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}
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func (r *sampleRing) iterator() SeriesIterator {
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return &sampleRingIterator{r: r, i: -1}
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}
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type sampleRingIterator struct {
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r *sampleRing
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i int
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}
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func (it *sampleRingIterator) Next() bool {
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it.i++
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return it.i < it.r.l
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}
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func (it *sampleRingIterator) Seek(int64) bool {
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return false
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}
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func (it *sampleRingIterator) Err() error {
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return nil
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}
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func (it *sampleRingIterator) At() (int64, float64) {
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return it.r.at(it.i)
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}
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func (r *sampleRing) at(i int) (int64, float64) {
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j := (r.f + i) % len(r.buf)
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s := r.buf[j]
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return s.t, s.v
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}
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// add adds a sample to the ring buffer and frees all samples that fall
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// out of the delta range.
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func (r *sampleRing) add(t int64, v float64) {
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l := len(r.buf)
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// Grow the ring buffer if it fits no more elements.
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if l == r.l {
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buf := make([]sample, 2*l)
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copy(buf[l+r.f:], r.buf[r.f:])
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copy(buf, r.buf[:r.f])
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r.buf = buf
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r.i = r.f
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r.f += l
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} else {
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r.i++
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if r.i >= l {
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r.i -= l
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}
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}
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r.buf[r.i] = sample{t: t, v: v}
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r.l++
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// Free head of the buffer of samples that just fell out of the range.
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for r.buf[r.f].t < t-r.delta {
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r.f++
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if r.f >= l {
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r.f -= l
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}
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r.l--
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}
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}
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// last returns the most recent element added to the ring.
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func (r *sampleRing) last() (int64, float64, bool) {
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if r.l == 0 {
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return 0, 0, false
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}
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s := r.buf[r.i]
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return s.t, s.v, true
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}
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func (r *sampleRing) samples() []sample {
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res := make([]sample, r.l)
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var k = r.f + r.l
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var j int
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if k > len(r.buf) {
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k = len(r.buf)
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j = r.l - k + r.f
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}
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n := copy(res, r.buf[r.f:k])
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copy(res[n:], r.buf[:j])
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return res
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}
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type mockSeriesSet struct {
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next func() bool
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series func() Series
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116
querier_test.go
116
querier_test.go
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@ -1,7 +1,6 @@
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package tsdb
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import (
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"math/rand"
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"sort"
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"testing"
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@ -201,118 +200,3 @@ func expandSeriesIterator(it SeriesIterator) (r []sample, err error) {
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return r, it.Err()
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}
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func TestSampleRing(t *testing.T) {
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cases := []struct {
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input []int64
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delta int64
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size int
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}{
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{
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input: []int64{1, 2, 3, 4, 5, 6, 7, 8, 9, 10},
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delta: 2,
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size: 1,
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},
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{
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input: []int64{1, 2, 3, 4, 5, 6, 7, 8, 9, 10},
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delta: 2,
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size: 2,
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},
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{
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input: []int64{1, 2, 3, 4, 5, 6, 7, 8, 9, 10},
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delta: 7,
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size: 3,
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},
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{
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input: []int64{1, 2, 3, 4, 5, 16, 17, 18, 19, 20},
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delta: 7,
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size: 1,
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},
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}
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for _, c := range cases {
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r := newSampleRing(c.delta, c.size)
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input := []sample{}
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for _, t := range c.input {
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input = append(input, sample{
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t: t,
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v: float64(rand.Intn(100)),
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})
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}
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for i, s := range input {
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r.add(s.t, s.v)
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buffered := r.samples()
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for _, sold := range input[:i] {
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found := false
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for _, bs := range buffered {
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if bs.t == sold.t && bs.v == sold.v {
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found = true
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break
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}
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}
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if sold.t >= s.t-c.delta && !found {
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t.Fatalf("%d: expected sample %d to be in buffer but was not; buffer %v", i, sold.t, buffered)
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}
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if sold.t < s.t-c.delta && found {
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t.Fatalf("%d: unexpected sample %d in buffer; buffer %v", i, sold.t, buffered)
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}
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}
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}
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}
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}
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func TestBufferedSeriesIterator(t *testing.T) {
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var it *BufferedSeriesIterator
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bufferEq := func(exp []sample) {
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var b []sample
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bit := it.Buffer()
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for bit.Next() {
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t, v := bit.At()
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b = append(b, sample{t: t, v: v})
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}
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require.Equal(t, exp, b, "buffer mismatch")
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}
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sampleEq := func(ets int64, ev float64) {
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ts, v := it.At()
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require.Equal(t, ets, ts, "timestamp mismatch")
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require.Equal(t, ev, v, "value mismatch")
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}
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it = NewBuffer(newListSeriesIterator([]sample{
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{t: 1, v: 2},
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{t: 2, v: 3},
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{t: 3, v: 4},
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{t: 4, v: 5},
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{t: 5, v: 6},
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{t: 99, v: 8},
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{t: 100, v: 9},
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{t: 101, v: 10},
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}), 2)
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require.True(t, it.Seek(-123), "seek failed")
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sampleEq(1, 2)
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bufferEq(nil)
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require.True(t, it.Next(), "next failed")
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sampleEq(2, 3)
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bufferEq([]sample{{t: 1, v: 2}})
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require.True(t, it.Next(), "next failed")
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require.True(t, it.Next(), "next failed")
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require.True(t, it.Next(), "next failed")
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sampleEq(5, 6)
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bufferEq([]sample{{t: 2, v: 3}, {t: 3, v: 4}, {t: 4, v: 5}})
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require.True(t, it.Seek(5), "seek failed")
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sampleEq(5, 6)
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bufferEq([]sample{{t: 2, v: 3}, {t: 3, v: 4}, {t: 4, v: 5}})
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require.True(t, it.Seek(101), "seek failed")
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sampleEq(101, 10)
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bufferEq([]sample{{t: 99, v: 8}, {t: 100, v: 9}})
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require.False(t, it.Next(), "next succeeded unexpectedly")
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}
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203
tsdbutil/buffer.go
Normal file
203
tsdbutil/buffer.go
Normal file
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@ -0,0 +1,203 @@
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package tsdbutil
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import (
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"math"
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"github.com/fabxc/tsdb"
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)
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// BufferedSeriesIterator wraps an iterator with a look-back buffer.
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type BufferedSeriesIterator struct {
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it tsdb.SeriesIterator
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buf *sampleRing
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lastTime int64
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}
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// NewBuffer returns a new iterator that buffers the values within the time range
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// of the current element and the duration of delta before.
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func NewBuffer(it tsdb.SeriesIterator, delta int64) *BufferedSeriesIterator {
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return &BufferedSeriesIterator{
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it: it,
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buf: newSampleRing(delta, 16),
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lastTime: math.MinInt64,
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}
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}
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// PeekBack returns the previous element of the iterator. If there is none buffered,
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// ok is false.
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func (b *BufferedSeriesIterator) PeekBack() (t int64, v float64, ok bool) {
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return b.buf.last()
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}
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// Buffer returns an iterator over the buffered data.
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func (b *BufferedSeriesIterator) Buffer() tsdb.SeriesIterator {
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return b.buf.iterator()
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}
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// Seek advances the iterator to the element at time t or greater.
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func (b *BufferedSeriesIterator) Seek(t int64) bool {
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t0 := t - b.buf.delta
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// If the delta would cause us to seek backwards, preserve the buffer
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// and just continue regular advancment while filling the buffer on the way.
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if t0 > b.lastTime {
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b.buf.reset()
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ok := b.it.Seek(t0)
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if !ok {
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return false
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}
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b.lastTime, _ = b.At()
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}
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if b.lastTime >= t {
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return true
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}
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for b.Next() {
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if b.lastTime >= t {
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return true
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}
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}
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return false
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}
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// Next advances the iterator to the next element.
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func (b *BufferedSeriesIterator) Next() bool {
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// Add current element to buffer before advancing.
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b.buf.add(b.it.At())
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ok := b.it.Next()
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if ok {
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b.lastTime, _ = b.At()
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}
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return ok
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}
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// At returns the current element of the iterator.
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func (b *BufferedSeriesIterator) At() (int64, float64) {
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return b.it.At()
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}
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// Err returns the last encountered error.
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func (b *BufferedSeriesIterator) Err() error {
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return b.it.Err()
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}
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type sample struct {
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t int64
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v float64
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}
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type sampleRing struct {
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delta int64
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buf []sample // lookback buffer
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i int // position of most recent element in ring buffer
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f int // position of first element in ring buffer
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l int // number of elements in buffer
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}
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func newSampleRing(delta int64, sz int) *sampleRing {
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r := &sampleRing{delta: delta, buf: make([]sample, sz)}
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r.reset()
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return r
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}
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func (r *sampleRing) reset() {
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r.l = 0
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r.i = -1
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r.f = 0
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}
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func (r *sampleRing) iterator() tsdb.SeriesIterator {
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return &sampleRingIterator{r: r, i: -1}
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}
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type sampleRingIterator struct {
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r *sampleRing
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i int
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}
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func (it *sampleRingIterator) Next() bool {
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it.i++
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return it.i < it.r.l
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}
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func (it *sampleRingIterator) Seek(int64) bool {
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return false
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}
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func (it *sampleRingIterator) Err() error {
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return nil
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}
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func (it *sampleRingIterator) At() (int64, float64) {
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return it.r.at(it.i)
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}
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func (r *sampleRing) at(i int) (int64, float64) {
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j := (r.f + i) % len(r.buf)
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s := r.buf[j]
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return s.t, s.v
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}
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// add adds a sample to the ring buffer and frees all samples that fall
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// out of the delta range.
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func (r *sampleRing) add(t int64, v float64) {
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l := len(r.buf)
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// Grow the ring buffer if it fits no more elements.
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if l == r.l {
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buf := make([]sample, 2*l)
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copy(buf[l+r.f:], r.buf[r.f:])
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copy(buf, r.buf[:r.f])
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r.buf = buf
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r.i = r.f
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r.f += l
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} else {
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r.i++
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if r.i >= l {
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r.i -= l
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}
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}
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r.buf[r.i] = sample{t: t, v: v}
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r.l++
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// Free head of the buffer of samples that just fell out of the range.
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for r.buf[r.f].t < t-r.delta {
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r.f++
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if r.f >= l {
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r.f -= l
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}
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r.l--
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}
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}
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// last returns the most recent element added to the ring.
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func (r *sampleRing) last() (int64, float64, bool) {
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if r.l == 0 {
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return 0, 0, false
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}
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s := r.buf[r.i]
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return s.t, s.v, true
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}
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func (r *sampleRing) samples() []sample {
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res := make([]sample, r.l)
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|
||||
var k = r.f + r.l
|
||||
var j int
|
||||
if k > len(r.buf) {
|
||||
k = len(r.buf)
|
||||
j = r.l - k + r.f
|
||||
}
|
||||
|
||||
n := copy(res, r.buf[r.f:k])
|
||||
copy(res[n:], r.buf[:j])
|
||||
|
||||
return res
|
||||
}
|
||||
160
tsdbutil/buffer_test.go
Normal file
160
tsdbutil/buffer_test.go
Normal file
|
|
@ -0,0 +1,160 @@
|
|||
package tsdbutil
|
||||
|
||||
import (
|
||||
"math/rand"
|
||||
"sort"
|
||||
"testing"
|
||||
|
||||
"github.com/stretchr/testify/require"
|
||||
)
|
||||
|
||||
func TestSampleRing(t *testing.T) {
|
||||
cases := []struct {
|
||||
input []int64
|
||||
delta int64
|
||||
size int
|
||||
}{
|
||||
{
|
||||
input: []int64{1, 2, 3, 4, 5, 6, 7, 8, 9, 10},
|
||||
delta: 2,
|
||||
size: 1,
|
||||
},
|
||||
{
|
||||
input: []int64{1, 2, 3, 4, 5, 6, 7, 8, 9, 10},
|
||||
delta: 2,
|
||||
size: 2,
|
||||
},
|
||||
{
|
||||
input: []int64{1, 2, 3, 4, 5, 6, 7, 8, 9, 10},
|
||||
delta: 7,
|
||||
size: 3,
|
||||
},
|
||||
{
|
||||
input: []int64{1, 2, 3, 4, 5, 16, 17, 18, 19, 20},
|
||||
delta: 7,
|
||||
size: 1,
|
||||
},
|
||||
}
|
||||
for _, c := range cases {
|
||||
r := newSampleRing(c.delta, c.size)
|
||||
|
||||
input := []sample{}
|
||||
for _, t := range c.input {
|
||||
input = append(input, sample{
|
||||
t: t,
|
||||
v: float64(rand.Intn(100)),
|
||||
})
|
||||
}
|
||||
|
||||
for i, s := range input {
|
||||
r.add(s.t, s.v)
|
||||
buffered := r.samples()
|
||||
|
||||
for _, sold := range input[:i] {
|
||||
found := false
|
||||
for _, bs := range buffered {
|
||||
if bs.t == sold.t && bs.v == sold.v {
|
||||
found = true
|
||||
break
|
||||
}
|
||||
}
|
||||
if sold.t >= s.t-c.delta && !found {
|
||||
t.Fatalf("%d: expected sample %d to be in buffer but was not; buffer %v", i, sold.t, buffered)
|
||||
}
|
||||
if sold.t < s.t-c.delta && found {
|
||||
t.Fatalf("%d: unexpected sample %d in buffer; buffer %v", i, sold.t, buffered)
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
func TestBufferedSeriesIterator(t *testing.T) {
|
||||
var it *BufferedSeriesIterator
|
||||
|
||||
bufferEq := func(exp []sample) {
|
||||
var b []sample
|
||||
bit := it.Buffer()
|
||||
for bit.Next() {
|
||||
t, v := bit.At()
|
||||
b = append(b, sample{t: t, v: v})
|
||||
}
|
||||
require.Equal(t, exp, b, "buffer mismatch")
|
||||
}
|
||||
sampleEq := func(ets int64, ev float64) {
|
||||
ts, v := it.At()
|
||||
require.Equal(t, ets, ts, "timestamp mismatch")
|
||||
require.Equal(t, ev, v, "value mismatch")
|
||||
}
|
||||
|
||||
it = NewBuffer(newListSeriesIterator([]sample{
|
||||
{t: 1, v: 2},
|
||||
{t: 2, v: 3},
|
||||
{t: 3, v: 4},
|
||||
{t: 4, v: 5},
|
||||
{t: 5, v: 6},
|
||||
{t: 99, v: 8},
|
||||
{t: 100, v: 9},
|
||||
{t: 101, v: 10},
|
||||
}), 2)
|
||||
|
||||
require.True(t, it.Seek(-123), "seek failed")
|
||||
sampleEq(1, 2)
|
||||
bufferEq(nil)
|
||||
|
||||
require.True(t, it.Next(), "next failed")
|
||||
sampleEq(2, 3)
|
||||
bufferEq([]sample{{t: 1, v: 2}})
|
||||
|
||||
require.True(t, it.Next(), "next failed")
|
||||
require.True(t, it.Next(), "next failed")
|
||||
require.True(t, it.Next(), "next failed")
|
||||
sampleEq(5, 6)
|
||||
bufferEq([]sample{{t: 2, v: 3}, {t: 3, v: 4}, {t: 4, v: 5}})
|
||||
|
||||
require.True(t, it.Seek(5), "seek failed")
|
||||
sampleEq(5, 6)
|
||||
bufferEq([]sample{{t: 2, v: 3}, {t: 3, v: 4}, {t: 4, v: 5}})
|
||||
|
||||
require.True(t, it.Seek(101), "seek failed")
|
||||
sampleEq(101, 10)
|
||||
bufferEq([]sample{{t: 99, v: 8}, {t: 100, v: 9}})
|
||||
|
||||
require.False(t, it.Next(), "next succeeded unexpectedly")
|
||||
}
|
||||
|
||||
type listSeriesIterator struct {
|
||||
list []sample
|
||||
idx int
|
||||
}
|
||||
|
||||
func newListSeriesIterator(list []sample) *listSeriesIterator {
|
||||
return &listSeriesIterator{list: list, idx: -1}
|
||||
}
|
||||
|
||||
func (it *listSeriesIterator) At() (int64, float64) {
|
||||
s := it.list[it.idx]
|
||||
return s.t, s.v
|
||||
}
|
||||
|
||||
func (it *listSeriesIterator) Next() bool {
|
||||
it.idx++
|
||||
return it.idx < len(it.list)
|
||||
}
|
||||
|
||||
func (it *listSeriesIterator) Seek(t int64) bool {
|
||||
if it.idx == -1 {
|
||||
it.idx = 0
|
||||
}
|
||||
// Do binary search between current position and end.
|
||||
it.idx = sort.Search(len(it.list)-it.idx, func(i int) bool {
|
||||
s := it.list[i+it.idx]
|
||||
return s.t >= t
|
||||
})
|
||||
|
||||
return it.idx < len(it.list)
|
||||
}
|
||||
|
||||
func (it *listSeriesIterator) Err() error {
|
||||
return nil
|
||||
}
|
||||
Loading…
Reference in a new issue