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