prometheus/querier_test.go
2017-04-10 20:59:45 +02:00

216 lines
4.9 KiB
Go

// Copyright 2017 The Prometheus Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package tsdb
import (
"sort"
"testing"
"github.com/prometheus/tsdb/labels"
"github.com/stretchr/testify/require"
)
type mockSeriesIterator struct {
seek func(int64) bool
at func() (int64, float64)
next func() bool
err func() error
}
func (m *mockSeriesIterator) Seek(t int64) bool { return m.seek(t) }
func (m *mockSeriesIterator) At() (int64, float64) { return m.at() }
func (m *mockSeriesIterator) Next() bool { return m.next() }
func (m *mockSeriesIterator) Err() error { return m.err() }
type mockSeries struct {
labels func() labels.Labels
iterator func() SeriesIterator
}
func (m *mockSeries) Labels() labels.Labels { return m.labels() }
func (m *mockSeries) Iterator() SeriesIterator { return m.iterator() }
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
}
func TestMergedSeriesSet(t *testing.T) {
newSeries := func(l map[string]string, s []sample) Series {
return &mockSeries{
labels: func() labels.Labels { return labels.FromMap(l) },
iterator: func() SeriesIterator { return newListSeriesIterator(s) },
}
}
cases := []struct {
// The input sets in order (samples in series in b are strictly
// after those in a).
a, b SeriesSet
// The composition of a and b in the partition series set must yield
// results equivalent to the result series set.
exp SeriesSet
}{
{
a: newListSeriesSet([]Series{
newSeries(map[string]string{
"a": "a",
}, []sample{
{t: 1, v: 1},
}),
}),
b: newListSeriesSet([]Series{
newSeries(map[string]string{
"a": "a",
}, []sample{
{t: 2, v: 2},
}),
newSeries(map[string]string{
"b": "b",
}, []sample{
{t: 1, v: 1},
}),
}),
exp: newListSeriesSet([]Series{
newSeries(map[string]string{
"a": "a",
}, []sample{
{t: 1, v: 1},
{t: 2, v: 2},
}),
newSeries(map[string]string{
"b": "b",
}, []sample{
{t: 1, v: 1},
}),
}),
},
{
a: newListSeriesSet([]Series{
newSeries(map[string]string{
"handler": "prometheus",
"instance": "127.0.0.1:9090",
}, []sample{
{t: 1, v: 1},
}),
newSeries(map[string]string{
"handler": "prometheus",
"instance": "localhost:9090",
}, []sample{
{t: 1, v: 2},
}),
}),
b: newListSeriesSet([]Series{
newSeries(map[string]string{
"handler": "prometheus",
"instance": "127.0.0.1:9090",
}, []sample{
{t: 2, v: 1},
}),
newSeries(map[string]string{
"handler": "query",
"instance": "localhost:9090",
}, []sample{
{t: 2, v: 2},
}),
}),
exp: newListSeriesSet([]Series{
newSeries(map[string]string{
"handler": "prometheus",
"instance": "127.0.0.1:9090",
}, []sample{
{t: 1, v: 1},
{t: 2, v: 1},
}),
newSeries(map[string]string{
"handler": "prometheus",
"instance": "localhost:9090",
}, []sample{
{t: 1, v: 2},
}),
newSeries(map[string]string{
"handler": "query",
"instance": "localhost:9090",
}, []sample{
{t: 2, v: 2},
}),
}),
},
}
Outer:
for _, c := range cases {
res := newMergedSeriesSet(c.a, c.b)
for {
eok, rok := c.exp.Next(), res.Next()
require.Equal(t, eok, rok, "next")
if !eok {
continue Outer
}
sexp := c.exp.At()
sres := res.At()
require.Equal(t, sexp.Labels(), sres.Labels(), "labels")
smplExp, errExp := expandSeriesIterator(sexp.Iterator())
smplRes, errRes := expandSeriesIterator(sres.Iterator())
require.Equal(t, errExp, errRes, "samples error")
require.Equal(t, smplExp, smplRes, "samples")
}
}
}
func expandSeriesIterator(it SeriesIterator) (r []sample, err error) {
for it.Next() {
t, v := it.At()
r = append(r, sample{t: t, v: v})
}
return r, it.Err()
}