mirror of
https://github.com/prometheus/statsd_exporter.git
synced 2024-11-22 23:41:00 +00:00
395 lines
12 KiB
Go
395 lines
12 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 registry
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import (
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"bytes"
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"fmt"
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"hash"
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"hash/fnv"
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"sort"
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"time"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/common/model"
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"github.com/prometheus/statsd_exporter/pkg/clock"
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"github.com/prometheus/statsd_exporter/pkg/mapper"
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"github.com/prometheus/statsd_exporter/pkg/metrics"
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)
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// uncheckedCollector wraps a Collector but its Describe method yields no Desc.
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// This allows incoming metrics to have inconsistent label sets
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type uncheckedCollector struct {
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c prometheus.Collector
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}
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func (u uncheckedCollector) Describe(_ chan<- *prometheus.Desc) {}
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func (u uncheckedCollector) Collect(c chan<- prometheus.Metric) {
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u.c.Collect(c)
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}
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type Registry struct {
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Registerer prometheus.Registerer
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Metrics map[string]metrics.Metric
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Mapper *mapper.MetricMapper
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// The below value and label variables are allocated in the registry struct
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// so that we don't have to allocate them every time have to compute a label
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// hash.
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ValueBuf, NameBuf bytes.Buffer
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Hasher hash.Hash64
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}
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func NewRegistry(reg prometheus.Registerer, mapper *mapper.MetricMapper) *Registry {
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return &Registry{
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Registerer: reg,
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Metrics: make(map[string]metrics.Metric),
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Mapper: mapper,
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Hasher: fnv.New64a(),
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}
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}
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func (r *Registry) MetricConflicts(metricName string, metricType metrics.MetricType) bool {
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vector, hasMetrics := r.Metrics[metricName]
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if !hasMetrics {
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// No metrics.Metric with this name exists
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return false
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}
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if vector.MetricType == metricType {
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// We've found a copy of this metrics.Metric with this type, but different
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// labels, so it's safe to create a new one.
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return false
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}
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// The metrics.Metric exists, but it's of a different type than we're trying to
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// create.
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return true
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}
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func (r *Registry) StoreCounter(metricName string, hash metrics.LabelHash, labels prometheus.Labels, vec *prometheus.CounterVec, c prometheus.Counter, ttl time.Duration) {
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r.Store(metricName, hash, labels, vec, c, metrics.CounterMetricType, ttl)
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}
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func (r *Registry) StoreGauge(metricName string, hash metrics.LabelHash, labels prometheus.Labels, vec *prometheus.GaugeVec, g prometheus.Gauge, ttl time.Duration) {
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r.Store(metricName, hash, labels, vec, g, metrics.GaugeMetricType, ttl)
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}
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func (r *Registry) StoreHistogram(metricName string, hash metrics.LabelHash, labels prometheus.Labels, vec *prometheus.HistogramVec, o prometheus.Observer, ttl time.Duration) {
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r.Store(metricName, hash, labels, vec, o, metrics.HistogramMetricType, ttl)
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}
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func (r *Registry) StoreSummary(metricName string, hash metrics.LabelHash, labels prometheus.Labels, vec *prometheus.SummaryVec, o prometheus.Observer, ttl time.Duration) {
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r.Store(metricName, hash, labels, vec, o, metrics.SummaryMetricType, ttl)
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}
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func (r *Registry) Store(metricName string, hash metrics.LabelHash, labels prometheus.Labels, vh metrics.VectorHolder, mh metrics.MetricHolder, metricType metrics.MetricType, ttl time.Duration) {
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metric, hasMetrics := r.Metrics[metricName]
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if !hasMetrics {
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metric.MetricType = metricType
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metric.Vectors = make(map[metrics.NameHash]*metrics.Vector)
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metric.Metrics = make(map[metrics.ValueHash]*metrics.RegisteredMetric)
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r.Metrics[metricName] = metric
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}
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v, ok := metric.Vectors[hash.Names]
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if !ok {
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v = &metrics.Vector{Holder: vh}
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metric.Vectors[hash.Names] = v
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}
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now := clock.Now()
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rm, ok := metric.Metrics[hash.Values]
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if !ok {
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rm = &metrics.RegisteredMetric{
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LastRegisteredAt: now,
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Labels: labels,
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TTL: ttl,
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Metric: mh,
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VecKey: hash.Names,
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}
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metric.Metrics[hash.Values] = rm
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v.RefCount++
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return
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}
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rm.LastRegisteredAt = now
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// Update ttl from mapping
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rm.TTL = ttl
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}
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func (r *Registry) Get(metricName string, hash metrics.LabelHash, metricType metrics.MetricType) (metrics.VectorHolder, metrics.MetricHolder) {
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metric, hasMetric := r.Metrics[metricName]
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if !hasMetric {
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return nil, nil
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}
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if metric.MetricType != metricType {
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return nil, nil
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}
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rm, ok := metric.Metrics[hash.Values]
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if ok {
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now := clock.Now()
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rm.LastRegisteredAt = now
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return metric.Vectors[hash.Names].Holder, rm.Metric
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}
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vector, ok := metric.Vectors[hash.Names]
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if ok {
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return vector.Holder, nil
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}
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return nil, nil
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}
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func (r *Registry) GetCounter(metricName string, labels prometheus.Labels, help string, mapping *mapper.MetricMapping, metricsCount *prometheus.GaugeVec) (prometheus.Counter, error) {
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hash, labelNames := r.HashLabels(labels)
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vh, mh := r.Get(metricName, hash, metrics.CounterMetricType)
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if mh != nil {
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return mh.(prometheus.Counter), nil
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}
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if r.MetricConflicts(metricName, metrics.CounterMetricType) {
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return nil, fmt.Errorf("metric with name %s is already registered", metricName)
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}
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var counterVec *prometheus.CounterVec
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if vh == nil {
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metricsCount.WithLabelValues("counter").Inc()
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counterVec = prometheus.NewCounterVec(prometheus.CounterOpts{
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Name: metricName,
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Help: help,
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}, labelNames)
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if err := r.Registerer.Register(uncheckedCollector{counterVec}); err != nil {
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return nil, err
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}
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} else {
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counterVec = vh.(*prometheus.CounterVec)
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}
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var counter prometheus.Counter
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var err error
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if counter, err = counterVec.GetMetricWith(labels); err != nil {
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return nil, err
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}
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r.StoreCounter(metricName, hash, labels, counterVec, counter, mapping.Ttl)
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return counter, nil
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}
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func (r *Registry) GetGauge(metricName string, labels prometheus.Labels, help string, mapping *mapper.MetricMapping, metricsCount *prometheus.GaugeVec) (prometheus.Gauge, error) {
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hash, labelNames := r.HashLabels(labels)
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vh, mh := r.Get(metricName, hash, metrics.GaugeMetricType)
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if mh != nil {
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return mh.(prometheus.Gauge), nil
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}
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if r.MetricConflicts(metricName, metrics.GaugeMetricType) {
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return nil, fmt.Errorf("metrics.Metric with name %s is already registered", metricName)
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}
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var gaugeVec *prometheus.GaugeVec
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if vh == nil {
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metricsCount.WithLabelValues("gauge").Inc()
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gaugeVec = prometheus.NewGaugeVec(prometheus.GaugeOpts{
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Name: metricName,
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Help: help,
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}, labelNames)
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if err := r.Registerer.Register(uncheckedCollector{gaugeVec}); err != nil {
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return nil, err
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}
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} else {
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gaugeVec = vh.(*prometheus.GaugeVec)
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}
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var gauge prometheus.Gauge
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var err error
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if gauge, err = gaugeVec.GetMetricWith(labels); err != nil {
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return nil, err
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}
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r.StoreGauge(metricName, hash, labels, gaugeVec, gauge, mapping.Ttl)
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return gauge, nil
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}
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func (r *Registry) GetHistogram(metricName string, labels prometheus.Labels, help string, mapping *mapper.MetricMapping, metricsCount *prometheus.GaugeVec) (prometheus.Observer, error) {
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hash, labelNames := r.HashLabels(labels)
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vh, mh := r.Get(metricName, hash, metrics.HistogramMetricType)
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if mh != nil {
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return mh.(prometheus.Observer), nil
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}
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if r.MetricConflicts(metricName, metrics.HistogramMetricType) {
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return nil, fmt.Errorf("metrics.Metric with name %s is already registered", metricName)
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}
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if r.MetricConflicts(metricName+"_sum", metrics.HistogramMetricType) {
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return nil, fmt.Errorf("metrics.Metric with name %s is already registered", metricName)
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}
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if r.MetricConflicts(metricName+"_count", metrics.HistogramMetricType) {
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return nil, fmt.Errorf("metrics.Metric with name %s is already registered", metricName)
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}
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if r.MetricConflicts(metricName+"_bucket", metrics.HistogramMetricType) {
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return nil, fmt.Errorf("metrics.Metric with name %s is already registered", metricName)
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}
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var histogramVec *prometheus.HistogramVec
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if vh == nil {
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metricsCount.WithLabelValues("histogram").Inc()
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buckets := r.Mapper.Defaults.HistogramOptions.Buckets
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if mapping.HistogramOptions != nil && len(mapping.HistogramOptions.Buckets) > 0 {
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buckets = mapping.HistogramOptions.Buckets
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}
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histogramVec = prometheus.NewHistogramVec(prometheus.HistogramOpts{
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Name: metricName,
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Help: help,
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Buckets: buckets,
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}, labelNames)
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if err := prometheus.Register(uncheckedCollector{histogramVec}); err != nil {
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return nil, err
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}
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} else {
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histogramVec = vh.(*prometheus.HistogramVec)
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}
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var observer prometheus.Observer
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var err error
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if observer, err = histogramVec.GetMetricWith(labels); err != nil {
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return nil, err
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}
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r.StoreHistogram(metricName, hash, labels, histogramVec, observer, mapping.Ttl)
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return observer, nil
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}
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func (r *Registry) GetSummary(metricName string, labels prometheus.Labels, help string, mapping *mapper.MetricMapping, metricsCount *prometheus.GaugeVec) (prometheus.Observer, error) {
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hash, labelNames := r.HashLabels(labels)
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vh, mh := r.Get(metricName, hash, metrics.SummaryMetricType)
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if mh != nil {
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return mh.(prometheus.Observer), nil
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}
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if r.MetricConflicts(metricName, metrics.SummaryMetricType) {
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return nil, fmt.Errorf("metrics.Metric with name %s is already registered", metricName)
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}
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if r.MetricConflicts(metricName+"_sum", metrics.SummaryMetricType) {
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return nil, fmt.Errorf("metrics.Metric with name %s is already registered", metricName)
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}
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if r.MetricConflicts(metricName+"_count", metrics.SummaryMetricType) {
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return nil, fmt.Errorf("metrics.Metric with name %s is already registered", metricName)
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}
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var summaryVec *prometheus.SummaryVec
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if vh == nil {
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metricsCount.WithLabelValues("summary").Inc()
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quantiles := r.Mapper.Defaults.SummaryOptions.Quantiles
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if mapping != nil && mapping.SummaryOptions != nil && len(mapping.SummaryOptions.Quantiles) > 0 {
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quantiles = mapping.SummaryOptions.Quantiles
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}
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summaryOptions := mapper.SummaryOptions{
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MaxAge: r.Mapper.Defaults.SummaryOptions.MaxAge,
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AgeBuckets: r.Mapper.Defaults.SummaryOptions.AgeBuckets,
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BufCap: r.Mapper.Defaults.SummaryOptions.BufCap,
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}
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if mapping != nil && mapping.SummaryOptions != nil {
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summaryOptions = *mapping.SummaryOptions
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}
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objectives := make(map[float64]float64)
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for _, q := range quantiles {
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objectives[q.Quantile] = q.Error
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}
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// In the case of no mapping file, explicitly define the default quantiles
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if len(objectives) == 0 {
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objectives = map[float64]float64{0.5: 0.05, 0.9: 0.01, 0.99: 0.001}
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}
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summaryVec = prometheus.NewSummaryVec(prometheus.SummaryOpts{
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Name: metricName,
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Help: help,
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Objectives: objectives,
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MaxAge: summaryOptions.MaxAge,
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AgeBuckets: summaryOptions.AgeBuckets,
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BufCap: summaryOptions.BufCap,
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}, labelNames)
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if err := prometheus.Register(uncheckedCollector{summaryVec}); err != nil {
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return nil, err
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}
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} else {
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summaryVec = vh.(*prometheus.SummaryVec)
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}
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var observer prometheus.Observer
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var err error
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if observer, err = summaryVec.GetMetricWith(labels); err != nil {
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return nil, err
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}
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r.StoreSummary(metricName, hash, labels, summaryVec, observer, mapping.Ttl)
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return observer, nil
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}
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func (r *Registry) RemoveStaleMetrics() {
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now := clock.Now()
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// delete timeseries with expired ttl
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for _, metric := range r.Metrics {
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for hash, rm := range metric.Metrics {
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if rm.TTL == 0 {
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continue
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}
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if rm.LastRegisteredAt.Add(rm.TTL).Before(now) {
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metric.Vectors[rm.VecKey].Holder.Delete(rm.Labels)
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metric.Vectors[rm.VecKey].RefCount--
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delete(metric.Metrics, hash)
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}
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}
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}
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}
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// Calculates a hash of both the label names and values.
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func (r *Registry) HashLabels(labels prometheus.Labels) (metrics.LabelHash, []string) {
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r.Hasher.Reset()
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r.NameBuf.Reset()
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r.ValueBuf.Reset()
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labelNames := make([]string, 0, len(labels))
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for labelName := range labels {
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labelNames = append(labelNames, labelName)
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}
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sort.Strings(labelNames)
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r.ValueBuf.WriteByte(model.SeparatorByte)
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for _, labelName := range labelNames {
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r.ValueBuf.WriteString(labels[labelName])
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r.ValueBuf.WriteByte(model.SeparatorByte)
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r.NameBuf.WriteString(labelName)
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r.NameBuf.WriteByte(model.SeparatorByte)
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}
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lh := metrics.LabelHash{}
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r.Hasher.Write(r.NameBuf.Bytes())
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lh.Names = metrics.NameHash(r.Hasher.Sum64())
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// Now add the values to the names we've already hashed.
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r.Hasher.Write(r.ValueBuf.Bytes())
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lh.Values = metrics.ValueHash(r.Hasher.Sum64())
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return lh, labelNames
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}
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