client_golang/model/metric.go

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// Copyright 2013 Prometheus Team
// 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 model
import (
"fmt"
"sort"
"strings"
)
// A Metric is similar to a LabelSet, but the key difference is that a Metric is
// a singleton and refers to one and only one stream of samples.
type Metric map[LabelName]LabelValue
// Equal compares the fingerprints of both metrics.
func (m Metric) Equal(o Metric) bool {
lFingerprint := &Fingerprint{}
rFingerprint := &Fingerprint{}
lFingerprint.LoadFromMetric(m)
rFingerprint.LoadFromMetric(o)
return lFingerprint.Equal(rFingerprint)
}
// Before compares the fingerprints of both metrics.
func (m Metric) Before(o Metric) bool {
lFingerprint := &Fingerprint{}
rFingerprint := &Fingerprint{}
lFingerprint.LoadFromMetric(m)
rFingerprint.LoadFromMetric(o)
return lFingerprint.Less(rFingerprint)
}
func (m Metric) String() string {
metricName, ok := m[MetricNameLabel]
if !ok {
panic("Tried to print metric without name")
}
labelStrings := make([]string, 0, len(m)-1)
for label, value := range m {
if label != MetricNameLabel {
labelStrings = append(labelStrings, fmt.Sprintf("%s=%q", label, value))
}
}
switch len(labelStrings) {
case 0:
return string(metricName)
default:
sort.Strings(labelStrings)
return fmt.Sprintf("%s{%s}", metricName, strings.Join(labelStrings, ", "))
}
}
// MergeFromLabelSet merges a label set into this Metric, prefixing a collision
// prefix to the label names merged from the label set where required.
func (m Metric) MergeFromLabelSet(labels LabelSet, collisionPrefix LabelName) {
for k, v := range labels {
if collisionPrefix != "" {
for {
if _, exists := m[k]; !exists {
break
}
k = collisionPrefix + k
}
}
m[k] = v
}
}