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config_map.go
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config_map.go
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package discoveryutils
import (
"sync"
"time"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/fasttime"
)
// ConfigMap is a map for storing discovery api configs.
//
// It automatically removes old configs which weren't accessed recently.
type ConfigMap struct {
mu sync.Mutex
m map[interface{}]*configMapEntry
hasCleaner bool
}
// NewConfigMap creates ConfigMap
func NewConfigMap() *ConfigMap {
return &ConfigMap{
m: make(map[interface{}]*configMapEntry),
}
}
// Get returns config for the given key.
//
// Key must be a pointer.
//
// It creates new config map with newConfig() call if cm doesn't contain config under the given key.
func (cm *ConfigMap) Get(key interface{}, newConfig func() (interface{}, error)) (interface{}, error) {
cm.mu.Lock()
defer cm.mu.Unlock()
if !cm.hasCleaner {
cm.hasCleaner = true
go cm.cleaner()
}
e := cm.m[key]
if e != nil {
e.lastAccessTime = fasttime.UnixTimestamp()
return e.cfg, nil
}
cfg, err := newConfig()
if err != nil {
return nil, err
}
cm.m[key] = &configMapEntry{
cfg: cfg,
lastAccessTime: fasttime.UnixTimestamp(),
}
return cfg, nil
}
func (cm *ConfigMap) cleaner() {
tc := time.NewTicker(15 * time.Minute)
for range tc.C {
currentTime := fasttime.UnixTimestamp()
cm.mu.Lock()
for k, e := range cm.m {
if currentTime-e.lastAccessTime > 10*60 {
delete(cm.m, k)
}
}
cm.mu.Unlock()
}
}
type configMapEntry struct {
cfg interface{}
lastAccessTime uint64
}