mirror of
https://github.com/rclone/rclone.git
synced 2024-12-04 22:34:48 +01:00
103 lines
2.8 KiB
Go
103 lines
2.8 KiB
Go
// Copyright 2013 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 model
|
|
|
|
import (
|
|
"fmt"
|
|
"regexp"
|
|
"sort"
|
|
"strings"
|
|
)
|
|
|
|
var (
|
|
// MetricNameRE is a regular expression matching valid metric
|
|
// names. Note that the IsValidMetricName function performs the same
|
|
// check but faster than a match with this regular expression.
|
|
MetricNameRE = regexp.MustCompile(`^[a-zA-Z_:][a-zA-Z0-9_:]*$`)
|
|
)
|
|
|
|
// 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 LabelSet
|
|
|
|
// Equal compares the metrics.
|
|
func (m Metric) Equal(o Metric) bool {
|
|
return LabelSet(m).Equal(LabelSet(o))
|
|
}
|
|
|
|
// Before compares the metrics' underlying label sets.
|
|
func (m Metric) Before(o Metric) bool {
|
|
return LabelSet(m).Before(LabelSet(o))
|
|
}
|
|
|
|
// Clone returns a copy of the Metric.
|
|
func (m Metric) Clone() Metric {
|
|
clone := make(Metric, len(m))
|
|
for k, v := range m {
|
|
clone[k] = v
|
|
}
|
|
return clone
|
|
}
|
|
|
|
func (m Metric) String() string {
|
|
metricName, hasName := m[MetricNameLabel]
|
|
numLabels := len(m) - 1
|
|
if !hasName {
|
|
numLabels = len(m)
|
|
}
|
|
labelStrings := make([]string, 0, numLabels)
|
|
for label, value := range m {
|
|
if label != MetricNameLabel {
|
|
labelStrings = append(labelStrings, fmt.Sprintf("%s=%q", label, value))
|
|
}
|
|
}
|
|
|
|
switch numLabels {
|
|
case 0:
|
|
if hasName {
|
|
return string(metricName)
|
|
}
|
|
return "{}"
|
|
default:
|
|
sort.Strings(labelStrings)
|
|
return fmt.Sprintf("%s{%s}", metricName, strings.Join(labelStrings, ", "))
|
|
}
|
|
}
|
|
|
|
// Fingerprint returns a Metric's Fingerprint.
|
|
func (m Metric) Fingerprint() Fingerprint {
|
|
return LabelSet(m).Fingerprint()
|
|
}
|
|
|
|
// FastFingerprint returns a Metric's Fingerprint calculated by a faster hashing
|
|
// algorithm, which is, however, more susceptible to hash collisions.
|
|
func (m Metric) FastFingerprint() Fingerprint {
|
|
return LabelSet(m).FastFingerprint()
|
|
}
|
|
|
|
// IsValidMetricName returns true iff name matches the pattern of MetricNameRE.
|
|
// This function, however, does not use MetricNameRE for the check but a much
|
|
// faster hardcoded implementation.
|
|
func IsValidMetricName(n LabelValue) bool {
|
|
if len(n) == 0 {
|
|
return false
|
|
}
|
|
for i, b := range n {
|
|
if !((b >= 'a' && b <= 'z') || (b >= 'A' && b <= 'Z') || b == '_' || b == ':' || (b >= '0' && b <= '9' && i > 0)) {
|
|
return false
|
|
}
|
|
}
|
|
return true
|
|
}
|