/
cleaner.go
89 lines (72 loc) · 1.73 KB
/
cleaner.go
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package tap
import (
"sync"
"time"
"github.com/google/gopacket/reassembly"
"github.com/kubeshark/kubeshark/logger"
"github.com/kubeshark/kubeshark/tap/api"
)
type CleanerStats struct {
deleted int
}
type Cleaner struct {
assembler *reassembly.Assembler
cleanPeriod time.Duration
connectionTimeout time.Duration
stats CleanerStats
statsMutex sync.Mutex
streamsMap api.TcpStreamMap
}
func (cl *Cleaner) clean() {
startCleanTime := time.Now()
cl.streamsMap.Range(func(k, v interface{}) bool {
reqResMatchers := v.(api.TcpStream).GetReqResMatchers()
for _, reqResMatcher := range reqResMatchers {
if reqResMatcher == nil {
continue
}
deleted := deleteOlderThan(reqResMatcher.GetMap(), startCleanTime.Add(-cl.connectionTimeout))
cl.stats.deleted += deleted
}
return true
})
cl.statsMutex.Lock()
logger.Log.Debugf("Assembler Stats after cleaning %s", cl.assembler.Dump())
cl.statsMutex.Unlock()
}
func (cl *Cleaner) start() {
go func() {
ticker := time.NewTicker(cl.cleanPeriod)
for {
<-ticker.C
cl.clean()
}
}()
}
func (cl *Cleaner) dumpStats() CleanerStats {
cl.statsMutex.Lock()
stats := CleanerStats{
deleted: cl.stats.deleted,
}
cl.stats.deleted = 0
cl.statsMutex.Unlock()
return stats
}
func deleteOlderThan(matcherMap *sync.Map, t time.Time) int {
numDeleted := 0
if matcherMap == nil {
return numDeleted
}
matcherMap.Range(func(key interface{}, value interface{}) bool {
message, _ := value.(*api.GenericMessage)
// TODO: Investigate the reason why `request` is `nil` in some rare occasion
if message != nil {
if message.CaptureTime.Before(t) {
matcherMap.Delete(key)
numDeleted++
}
}
return true
})
return numDeleted
}