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161 lines
3.3 KiB
161 lines
3.3 KiB
package tsdbutil
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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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"github.com/prometheus/tsdb/testutil"
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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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testutil.Equals(t, exp, b)
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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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testutil.Equals(t, ets, ts)
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testutil.Equals(t, ev, v)
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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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testutil.Assert(t, it.Seek(-123) == true, "seek failed")
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sampleEq(1, 2)
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bufferEq(nil)
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testutil.Assert(t, it.Next() == true, "next failed")
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sampleEq(2, 3)
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bufferEq([]sample{{t: 1, v: 2}})
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testutil.Assert(t, it.Next() == true, "next failed")
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testutil.Assert(t, it.Next() == true, "next failed")
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testutil.Assert(t, it.Next() == true, "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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testutil.Assert(t, it.Seek(5) == true, "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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testutil.Assert(t, it.Seek(101) == true, "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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testutil.Assert(t, it.Next() == false, "next succeeded unexpectedly")
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}
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type listSeriesIterator struct {
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list []sample
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idx int
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}
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func newListSeriesIterator(list []sample) *listSeriesIterator {
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return &listSeriesIterator{list: list, idx: -1}
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}
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func (it *listSeriesIterator) At() (int64, float64) {
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s := it.list[it.idx]
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return s.t, s.v
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}
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func (it *listSeriesIterator) Next() bool {
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it.idx++
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return it.idx < len(it.list)
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}
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func (it *listSeriesIterator) Seek(t int64) bool {
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if it.idx == -1 {
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it.idx = 0
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}
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// Do binary search between current position and end.
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it.idx = sort.Search(len(it.list)-it.idx, func(i int) bool {
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s := it.list[i+it.idx]
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return s.t >= t
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})
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return it.idx < len(it.list)
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}
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func (it *listSeriesIterator) Err() error {
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return nil
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}
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