/
collector.go
168 lines (140 loc) · 4.42 KB
/
collector.go
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package collection
import (
"context"
"fmt"
def "github.com/whaoinfo/net-defragmenter/definition"
"github.com/whaoinfo/net-defragmenter/internal/common"
"github.com/whaoinfo/net-defragmenter/internal/handler"
"github.com/whaoinfo/net-defragmenter/internal/linkqueue"
"github.com/whaoinfo/net-defragmenter/libstats"
"time"
)
func newCollector(id, maxListenChanCap uint32, ptrFullPktQueue *linkqueue.LinkQueue) *Collector {
cancelCtx, cancelFunc := context.WithCancel(context.Background())
return &Collector{
id: id,
cancelCtx: cancelCtx,
cancelFunc: cancelFunc,
listenChan: make(chan *common.FragmentElement, maxListenChanCap),
fragElemSetMap: make(map[def.FragmentGroupID]*common.FragmentElementSet),
ptrFullPktQueue: ptrFullPktQueue,
sharedLayers: common.NewSharedLayers(),
}
}
type Collector struct {
id uint32
cancelCtx context.Context
cancelFunc context.CancelFunc
listenChan chan *common.FragmentElement
fragElemSetMap map[def.FragmentGroupID]*common.FragmentElementSet
ptrFullPktQueue *linkqueue.LinkQueue
sharedLayers *common.SharedLayers
}
func (t *Collector) start() {
go t.schedulingCoroutine()
}
func (t *Collector) close() {
t.cancelFunc()
}
func (t *Collector) stop() {
}
func (t *Collector) schedulingCoroutine() {
fragSetCheckTimer := time.NewTicker(time.Second * time.Duration(intervalCheckFragSec))
sharedLayersRestTimer := time.NewTicker(time.Second * time.Duration(intervalRestSharedLayersFragSec))
loopExit:
for {
select {
case <-fragSetCheckTimer.C:
t.checkFragmentElementSetExpired()
break
case <-sharedLayersRestTimer.C:
if t.sharedLayers.GetReferencesNum() > 0 {
t.sharedLayers.Reset()
}
break
case clsData, ok := <-t.listenChan:
if !ok {
break loopExit
}
if err := t.accept(clsData); err != nil {
// todo
}
break
case <-t.cancelCtx.Done():
break loopExit
}
}
fragSetCheckTimer.Stop()
sharedLayersRestTimer.Stop()
t.stop()
}
func (t *Collector) checkFragmentElementSetExpired() {
nowTp := time.Now().Unix()
var expiredSets []*common.FragmentElementSet
for _, fragElemSet := range t.fragElemSetMap {
if (nowTp - fragElemSet.GetCreateTimestamp()) > fragSetDurationSec {
expiredSets = append(expiredSets, fragElemSet)
}
}
for _, fragElemSet := range expiredSets {
delete(t.fragElemSetMap, fragElemSet.GetID())
fragElemSet.Release()
libstats.AddTotalReleaseFragSetThExpiredNum(1)
}
}
func (t *Collector) accept(fragElem *common.FragmentElement) error {
libstats.AddTotalAcceptFragmentElementNum(1)
hd := handler.GetHandler(fragElem.Type)
if hd == nil {
libstats.AddTotalCollectHandleNilErrNum(1)
return fmt.Errorf("handler with fragment type %v dose not exists", fragElem.Type)
}
fragElemSet, exist := t.fragElemSetMap[fragElem.GroupID]
if !exist {
t.fragElemSetMap[fragElem.GroupID] = common.NewFragmentElementSet(fragElem.GroupID)
fragElemSet = t.fragElemSetMap[fragElem.GroupID]
libstats.AddTotalNewFragmentSetNum(1)
}
collectErr, collectErrType := hd.Collect(fragElem, fragElemSet)
if collectErr != nil {
libstats.AddTotalCollectErrStatsNum(1, collectErrType)
return collectErr
}
libstats.AddTotalAcceptFragSuccessfulNum(1)
if err := t.checkAndReassembly(fragElemSet, fragElem, hd); err != nil {
return err
}
return nil
}
func (t *Collector) checkAndReassembly(fragElemSet *common.FragmentElementSet, fragElem *common.FragmentElement, hd handler.IHandler) error {
if !fragElemSet.CheckFinalElementExists() || fragElemSet.GetHighest() != fragElemSet.GetCurrentLen() {
return nil
}
if _, exist := t.fragElemSetMap[fragElemSet.GetID()]; exist {
delete(t.fragElemSetMap, fragElemSet.GetID())
} else {
libstats.AddTotalDelFragSetNotExistNum(1)
}
fragElemListLen := fragElemSet.GetElementListLen()
defer func() {
fragElemSet.Release()
libstats.AddTotalReleaseFragSetThReassemblyNum(1)
}()
pkt, reassemblyErr, errType := hd.Reassembly(fragElemSet, t.sharedLayers)
t.sharedLayers.UpdateReferences()
if reassemblyErr != nil {
libstats.AddTotalReassemblyErrStatsNum(1, errType)
return reassemblyErr
}
libstats.AddTotalReassemblyFragNum(uint64(fragElemListLen))
libstats.AddTotalPushCompletePktNum(1)
t.ptrFullPktQueue.SafetyPutValue(&def.FullPacket{
InMarkValue: fragElem.InMarkValue,
FragGroupID: fragElem.GroupID,
Pkt: pkt,
})
return nil
}
func (t *Collector) pushFragmentElement(fragElem *common.FragmentElement) {
t.listenChan <- fragElem
}