forked from mirror/client_golang
159 lines
4.5 KiB
Go
159 lines
4.5 KiB
Go
// Copyright 2018 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package testutil
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import (
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"bytes"
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"fmt"
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"reflect"
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"sort"
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"github.com/prometheus/common/expfmt"
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dto "github.com/prometheus/client_model/go"
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"github.com/prometheus/client_golang/prometheus"
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)
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// GatherAndCompare retrieves all metrics exposed by a collector and compares it
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// to an expected output in the Prometheus text exposition format.
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// metricNames allows only comparing the given metrics. All are compared if it's nil.
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func GatherAndCompare(c prometheus.Collector, expected string, metricNames ...string) error {
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reg := prometheus.NewPedanticRegistry()
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if err := reg.Register(c); err != nil {
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return fmt.Errorf("registering collector failed: %s", err)
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}
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metrics, err := reg.Gather()
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if err != nil {
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return fmt.Errorf("gathering metrics failed: %s", err)
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}
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if metricNames != nil {
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metrics = filterMetrics(metrics, metricNames)
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}
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var tp expfmt.TextParser
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expectedMetrics, err := tp.TextToMetricFamilies(bytes.NewReader([]byte(expected)))
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if err != nil {
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return fmt.Errorf("parsing expected metrics failed: %s", err)
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}
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if !reflect.DeepEqual(metrics, normalizeMetricFamilies(expectedMetrics)) {
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// Encode the gathered output to the readbale text format for comparison.
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var buf1 bytes.Buffer
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enc := expfmt.NewEncoder(&buf1, expfmt.FmtText)
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for _, mf := range metrics {
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if err := enc.Encode(mf); err != nil {
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return fmt.Errorf("encoding result failed: %s", err)
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}
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}
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// Encode normalized expected metrics again to generate them in the same ordering
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// the registry does to spot differences more easily.
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var buf2 bytes.Buffer
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enc = expfmt.NewEncoder(&buf2, expfmt.FmtText)
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for _, mf := range normalizeMetricFamilies(expectedMetrics) {
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if err := enc.Encode(mf); err != nil {
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return fmt.Errorf("encoding result failed: %s", err)
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}
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}
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return fmt.Errorf(`
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metric output does not match expectation; want:
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%s
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got:
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%s
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`, buf2.String(), buf1.String())
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}
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return nil
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}
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func filterMetrics(metrics []*dto.MetricFamily, names []string) []*dto.MetricFamily {
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var filtered []*dto.MetricFamily
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for _, m := range metrics {
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drop := true
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for _, name := range names {
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if m.GetName() == name {
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drop = false
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break
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}
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}
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if !drop {
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filtered = append(filtered, m)
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}
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}
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return filtered
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}
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// The below sorting code is copied form the Prometheus client library modulo the added
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// label pair sorting.
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// https://github.com/prometheus/client_golang/blob/ea6e1db4cb8127eeb0b6954f7320363e5451820f/prometheus/registry.go#L642-L684
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// metricSorter is a sortable slice of *dto.Metric.
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type metricSorter []*dto.Metric
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func (s metricSorter) Len() int {
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return len(s)
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}
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func (s metricSorter) Swap(i, j int) {
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s[i], s[j] = s[j], s[i]
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}
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func (s metricSorter) Less(i, j int) bool {
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sort.Sort(prometheus.LabelPairSorter(s[i].Label))
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sort.Sort(prometheus.LabelPairSorter(s[j].Label))
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if len(s[i].Label) != len(s[j].Label) {
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return len(s[i].Label) < len(s[j].Label)
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}
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for n, lp := range s[i].Label {
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vi := lp.GetValue()
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vj := s[j].Label[n].GetValue()
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if vi != vj {
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return vi < vj
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}
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}
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if s[i].TimestampMs == nil {
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return false
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}
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if s[j].TimestampMs == nil {
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return true
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}
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return s[i].GetTimestampMs() < s[j].GetTimestampMs()
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}
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// normalizeMetricFamilies returns a MetricFamily slice with empty
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// MetricFamilies pruned and the remaining MetricFamilies sorted by name within
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// the slice, with the contained Metrics sorted within each MetricFamily.
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func normalizeMetricFamilies(metricFamiliesByName map[string]*dto.MetricFamily) []*dto.MetricFamily {
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for _, mf := range metricFamiliesByName {
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sort.Sort(metricSorter(mf.Metric))
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}
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names := make([]string, 0, len(metricFamiliesByName))
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for name, mf := range metricFamiliesByName {
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if len(mf.Metric) > 0 {
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names = append(names, name)
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}
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}
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sort.Strings(names)
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result := make([]*dto.MetricFamily, 0, len(names))
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for _, name := range names {
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result = append(result, metricFamiliesByName[name])
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}
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return result
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}
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