statsd_exporter/pkg/mapper/mapper_cache.go

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// Copyright 2019 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 mapper
import (
"github.com/prometheus/client_golang/prometheus"
)
type CacheMetrics struct {
CacheLength prometheus.Gauge
CacheGetsTotal prometheus.Counter
CacheHitsTotal prometheus.Counter
}
func NewCacheMetrics(reg prometheus.Registerer) *CacheMetrics {
var m CacheMetrics
m.CacheLength = prometheus.NewGauge(
prometheus.GaugeOpts{
Name: "statsd_metric_mapper_cache_length",
Help: "The count of unique metrics currently cached.",
},
)
m.CacheGetsTotal = prometheus.NewCounter(
prometheus.CounterOpts{
Name: "statsd_metric_mapper_cache_gets_total",
Help: "The count of total metric cache gets.",
},
)
m.CacheHitsTotal = prometheus.NewCounter(
prometheus.CounterOpts{
Name: "statsd_metric_mapper_cache_hits_total",
Help: "The count of total metric cache hits.",
},
)
if reg != nil {
reg.MustRegister(m.CacheLength)
reg.MustRegister(m.CacheGetsTotal)
reg.MustRegister(m.CacheHitsTotal)
}
return &m
}
type MetricMapperCacheResult struct {
Mapping *MetricMapping
Matched bool
Labels prometheus.Labels
}
// MetricMapperCache MUST be thread-safe and should be instrumented with CacheMetrics
type MetricMapperCache interface {
// Get a cached result
Get(metricKey string) (interface{}, bool)
// Add a statsd MetricMapperResult to the cache
Add(metricKey string, result interface{}) // Add an item to the cache
// Reset clears the cache for config reloads
Reset()
}
func formatKey(metricString string, metricType MetricType) string {
return string(metricType) + "." + metricString
}