forked from mirrors/statsd_exporter
101 lines
2.7 KiB
Go
101 lines
2.7 KiB
Go
// Copyright 2019 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 mapper
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import (
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"github.com/hashicorp/golang-lru"
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"github.com/prometheus/client_golang/prometheus"
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)
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var (
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cacheLength = prometheus.NewGauge(
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prometheus.GaugeOpts{
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Name: "statsd_exporter_cache_length",
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Help: "The count of unique metrics currently cached.",
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},
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)
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)
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type MetricMapperCacheResult struct {
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Mapping *MetricMapping
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Matched bool
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Labels prometheus.Labels
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}
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type MetricMapperCache interface {
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Get(metricString string) (*MetricMapperCacheResult, bool)
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AddMatch(metricString string, mapping *MetricMapping, labels prometheus.Labels)
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AddMiss(metricString string)
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}
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type MetricMapperLRUCache struct {
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MetricMapperCache
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cache *lru.Cache
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}
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type MetricMapperNoopCache struct {
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MetricMapperCache
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}
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func NewMetricMapperCache(size int) (*MetricMapperLRUCache, error) {
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cacheLength.Set(0)
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cache, err := lru.New(size)
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if err != nil {
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return &MetricMapperLRUCache{}, err
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}
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return &MetricMapperLRUCache{cache: cache}, nil
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}
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func (m *MetricMapperLRUCache) Get(metricString string) (*MetricMapperCacheResult, bool) {
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if result, ok := m.cache.Get(metricString); ok {
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return result.(*MetricMapperCacheResult), true
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} else {
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return nil, false
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}
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}
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func (m *MetricMapperLRUCache) AddMatch(metricString string, mapping *MetricMapping, labels prometheus.Labels) {
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go m.trackCacheLength()
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m.cache.Add(metricString, &MetricMapperCacheResult{Mapping: mapping, Matched: true, Labels: labels})
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}
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func (m *MetricMapperLRUCache) AddMiss(metricString string) {
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go m.trackCacheLength()
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m.cache.Add(metricString, &MetricMapperCacheResult{Matched: false})
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}
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func (m *MetricMapperLRUCache) trackCacheLength() {
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cacheLength.Set(float64(m.cache.Len()))
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}
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func NewMetricMapperNoopCache() *MetricMapperNoopCache {
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cacheLength.Set(0)
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return &MetricMapperNoopCache{}
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}
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func (m *MetricMapperNoopCache) Get(metricString string) (*MetricMapperCacheResult, bool) {
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return nil, false
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}
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func (m *MetricMapperNoopCache) AddMatch(metricString string, mapping *MetricMapping, labels prometheus.Labels) {
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return
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}
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func (m *MetricMapperNoopCache) AddMiss(metricString string) {
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return
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}
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func init() {
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prometheus.MustRegister(cacheLength)
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}
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