82 lines
2.4 KiB
Go
82 lines
2.4 KiB
Go
// Copyright 2013 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 metrics is a minimal copy of github.com/prometheus/common/model
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// providing types to work with the Prometheus-style results in a DigitalOcean
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// Monitoring metrics response.
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package metrics
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import (
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"fmt"
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"sort"
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"strings"
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)
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const (
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// MetricNameLabel is the label name indicating the metric name of a
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// timeseries.
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MetricNameLabel = "__name__"
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)
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// A LabelSet is a collection of LabelName and LabelValue pairs. The LabelSet
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// may be fully-qualified down to the point where it may resolve to a single
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// Metric in the data store or not. All operations that occur within the realm
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// of a LabelSet can emit a vector of Metric entities to which the LabelSet may
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// match.
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type LabelSet map[LabelName]LabelValue
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func (l LabelSet) String() string {
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lstrs := make([]string, 0, len(l))
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for l, v := range l {
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lstrs = append(lstrs, fmt.Sprintf("%s=%q", l, v))
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}
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sort.Strings(lstrs)
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return fmt.Sprintf("{%s}", strings.Join(lstrs, ", "))
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}
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// A LabelValue is an associated value for a MetricLabelName.
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type LabelValue string
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// A LabelName is a key for a Metric.
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type LabelName string
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// A Metric is similar to a LabelSet, but the key difference is that a Metric is
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// a singleton and refers to one and only one stream of samples.
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type Metric LabelSet
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func (m Metric) String() string {
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metricName, hasName := m[MetricNameLabel]
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numLabels := len(m) - 1
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if !hasName {
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numLabels = len(m)
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}
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labelStrings := make([]string, 0, numLabels)
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for label, value := range m {
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if label != MetricNameLabel {
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labelStrings = append(labelStrings, fmt.Sprintf("%s=%q", label, value))
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}
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}
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switch numLabels {
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case 0:
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if hasName {
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return string(metricName)
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}
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return "{}"
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default:
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sort.Strings(labelStrings)
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return fmt.Sprintf("%s{%s}", metricName, strings.Join(labelStrings, ", "))
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}
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}
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