prometheus/model/labels/test_utils.go

88 lines
2.2 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 labels
import (
"bufio"
"fmt"
"os"
"strings"
)
// Slice is a sortable slice of label sets.
type Slice []Labels
func (s Slice) Len() int { return len(s) }
func (s Slice) Swap(i, j int) { s[i], s[j] = s[j], s[i] }
func (s Slice) Less(i, j int) bool { return Compare(s[i], s[j]) < 0 }
// Selector holds constraints for matching against a label set.
type Selector []*Matcher
// Matches returns whether the labels satisfy all matchers.
func (s Selector) Matches(labels Labels) bool {
for _, m := range s {
if v := labels.Get(m.Name); !m.Matches(v) {
return false
}
}
return true
}
// ReadLabels reads up to n label sets in a JSON formatted file fn. It is mostly useful
// to load testing data.
func ReadLabels(fn string, n int) ([]Labels, error) {
f, err := os.Open(fn)
if err != nil {
return nil, err
}
defer f.Close()
scanner := bufio.NewScanner(f)
b := NewScratchBuilder(0)
var mets []Labels
hashes := map[uint64]struct{}{}
i := 0
for scanner.Scan() && i < n {
b.Reset()
r := strings.NewReplacer("\"", "", "{", "", "}", "")
s := r.Replace(scanner.Text())
labelChunks := strings.Split(s, ",")
for _, labelChunk := range labelChunks {
split := strings.Split(labelChunk, ":")
b.Add(split[0], split[1])
}
// Order of the k/v labels matters, don't assume we'll always receive them already sorted.
b.Sort()
m := b.Labels()
h := m.Hash()
if _, ok := hashes[h]; ok {
continue
}
mets = append(mets, m)
hashes[h] = struct{}{}
i++
}
if i != n {
return mets, fmt.Errorf("requested %d metrics but found %d", n, i)
}
return mets, nil
}