68 lines
1.7 KiB
Go
68 lines
1.7 KiB
Go
package vsphere
|
|
|
|
import (
|
|
"log"
|
|
"sync"
|
|
"time"
|
|
)
|
|
|
|
// TSCache is a cache of timestamps used to determine the validity of datapoints
|
|
type TSCache struct {
|
|
ttl time.Duration
|
|
table map[string]time.Time
|
|
mux sync.RWMutex
|
|
}
|
|
|
|
// NewTSCache creates a new TSCache with a specified time-to-live after which timestamps are discarded.
|
|
func NewTSCache(ttl time.Duration) *TSCache {
|
|
return &TSCache{
|
|
ttl: ttl,
|
|
table: make(map[string]time.Time),
|
|
}
|
|
}
|
|
|
|
// Purge removes timestamps that are older than the time-to-live
|
|
func (t *TSCache) Purge() {
|
|
t.mux.Lock()
|
|
defer t.mux.Unlock()
|
|
n := 0
|
|
for k, v := range t.table {
|
|
if time.Now().Sub(v) > t.ttl {
|
|
delete(t.table, k)
|
|
n++
|
|
}
|
|
}
|
|
log.Printf("D! [inputs.vsphere] purged timestamp cache. %d deleted with %d remaining", n, len(t.table))
|
|
}
|
|
|
|
// IsNew returns true if the supplied timestamp for the supplied key is more recent than the
|
|
// timestamp we have on record.
|
|
func (t *TSCache) IsNew(key string, metricName string, tm time.Time) bool {
|
|
t.mux.RLock()
|
|
defer t.mux.RUnlock()
|
|
v, ok := t.table[makeKey(key, metricName)]
|
|
if !ok {
|
|
return true // We've never seen this before, so consider everything a new sample
|
|
}
|
|
return !tm.Before(v)
|
|
}
|
|
|
|
// Get returns a timestamp (if present)
|
|
func (t *TSCache) Get(key string, metricName string) (time.Time, bool) {
|
|
t.mux.RLock()
|
|
defer t.mux.RUnlock()
|
|
ts, ok := t.table[makeKey(key, metricName)]
|
|
return ts, ok
|
|
}
|
|
|
|
// Put updates the latest timestamp for the supplied key.
|
|
func (t *TSCache) Put(key string, metricName string, time time.Time) {
|
|
t.mux.Lock()
|
|
defer t.mux.Unlock()
|
|
t.table[makeKey(key, metricName)] = time
|
|
}
|
|
|
|
func makeKey(resource string, metric string) string {
|
|
return resource + "|" + metric
|
|
}
|