/usr/share/gocode/src/github.com/docker/go-metrics/namespace.go is in golang-github-docker-go-metrics-dev 0.0~git20161110.0.0f35294-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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import (
"fmt"
"sync"
"github.com/prometheus/client_golang/prometheus"
)
type Labels map[string]string
// NewNamespace returns a namespaces that is responsible for managing a collection of
// metrics for a particual namespace and subsystem
//
// labels allows const labels to be added to all metrics created in this namespace
// and are commonly used for data like application version and git commit
func NewNamespace(name, subsystem string, labels Labels) *Namespace {
if labels == nil {
labels = make(map[string]string)
}
return &Namespace{
name: name,
subsystem: subsystem,
labels: labels,
}
}
// Namespace describes a set of metrics that share a namespace and subsystem.
type Namespace struct {
name string
subsystem string
labels Labels
mu sync.Mutex
metrics []prometheus.Collector
}
// WithConstLabels returns a namespace with the provided set of labels merged
// with the existing constant labels on the namespace.
//
// Only metrics created with the returned namespace will get the new constant
// labels. The returned namespace must be registered separately.
func (n *Namespace) WithConstLabels(labels Labels) *Namespace {
n.mu.Lock()
ns := &Namespace{
name: n.name,
subsystem: n.subsystem,
labels: mergeLabels(n.labels, labels),
}
n.mu.Unlock()
return ns
}
func (n *Namespace) NewCounter(name, help string) Counter {
c := &counter{pc: prometheus.NewCounter(n.newCounterOpts(name, help))}
n.addMetric(c)
return c
}
func (n *Namespace) NewLabeledCounter(name, help string, labels ...string) LabeledCounter {
c := &labeledCounter{pc: prometheus.NewCounterVec(n.newCounterOpts(name, help), labels)}
n.addMetric(c)
return c
}
func (n *Namespace) newCounterOpts(name, help string) prometheus.CounterOpts {
return prometheus.CounterOpts{
Namespace: n.name,
Subsystem: n.subsystem,
Name: fmt.Sprintf("%s_%s", name, Total),
Help: help,
ConstLabels: prometheus.Labels(n.labels),
}
}
func (n *Namespace) NewTimer(name, help string) Timer {
t := &timer{
m: prometheus.NewHistogram(n.newTimerOpts(name, help)),
}
n.addMetric(t)
return t
}
func (n *Namespace) NewLabeledTimer(name, help string, labels ...string) LabeledTimer {
t := &labeledTimer{
m: prometheus.NewHistogramVec(n.newTimerOpts(name, help), labels),
}
n.addMetric(t)
return t
}
func (n *Namespace) newTimerOpts(name, help string) prometheus.HistogramOpts {
return prometheus.HistogramOpts{
Namespace: n.name,
Subsystem: n.subsystem,
Name: fmt.Sprintf("%s_%s", name, Seconds),
Help: help,
ConstLabels: prometheus.Labels(n.labels),
}
}
func (n *Namespace) NewGauge(name, help string, unit Unit) Gauge {
g := &gauge{
pg: prometheus.NewGauge(n.newGaugeOpts(name, help, unit)),
}
n.addMetric(g)
return g
}
func (n *Namespace) NewLabeledGauge(name, help string, unit Unit, labels ...string) LabeledGauge {
g := &labeledGauge{
pg: prometheus.NewGaugeVec(n.newGaugeOpts(name, help, unit), labels),
}
n.addMetric(g)
return g
}
func (n *Namespace) newGaugeOpts(name, help string, unit Unit) prometheus.GaugeOpts {
return prometheus.GaugeOpts{
Namespace: n.name,
Subsystem: n.subsystem,
Name: fmt.Sprintf("%s_%s", name, unit),
Help: help,
ConstLabels: prometheus.Labels(n.labels),
}
}
func (n *Namespace) Describe(ch chan<- *prometheus.Desc) {
n.mu.Lock()
defer n.mu.Unlock()
for _, metric := range n.metrics {
metric.Describe(ch)
}
}
func (n *Namespace) Collect(ch chan<- prometheus.Metric) {
n.mu.Lock()
defer n.mu.Unlock()
for _, metric := range n.metrics {
metric.Collect(ch)
}
}
func (n *Namespace) addMetric(collector prometheus.Collector) {
n.mu.Lock()
n.metrics = append(n.metrics, collector)
n.mu.Unlock()
}
// mergeLabels merges two or more labels objects into a single map, favoring
// the later labels.
func mergeLabels(lbs ...Labels) Labels {
merged := make(Labels)
for _, target := range lbs {
for k, v := range target {
merged[k] = v
}
}
return merged
}
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