use cached api to retrieve interface name to avoid highcpu (#251)

Signed-off-by: Mohamed Mahmoud <mmahmoud@redhat.com>

pkg/agent/agent.go

@@ -422,7 +422,7 @@ func (f *Flows) buildAndStartPipeline(ctx context.Context) (*node.Terminal[[]*fl
 	rbTracer.SendsTo(accounter)
 
 	if f.cfg.Deduper == DeduperFirstCome {
-		deduper := node.AsMiddle(flow.Dedupe(f.cfg.DeduperFCExpiry, f.cfg.DeduperJustMark, f.cfg.DeduperMerge),
+		deduper := node.AsMiddle(flow.Dedupe(f.cfg.DeduperFCExpiry, f.cfg.DeduperJustMark, f.cfg.DeduperMerge, f.interfaceNamer),
 			node.ChannelBufferLen(f.cfg.BuffersLength))
 		mapTracer.SendsTo(deduper)
 		accounter.SendsTo(deduper)

pkg/flow/deduper.go

@@ -8,7 +8,6 @@ import (
 	"github.com/sirupsen/logrus"
 
 	"github.com/netobserv/netobserv-ebpf-agent/pkg/ebpf"
-	"github.com/netobserv/netobserv-ebpf-agent/pkg/utils"
 )
 
 var dlog = logrus.WithField("component", "flow/Deduper")
@@ -40,7 +39,7 @@ type entry struct {
 // (no activity for it during the expiration time)
 // The justMark argument tells that the deduper should not drop the duplicate flows but
 // set their Duplicate field.
-func Dedupe(expireTime time.Duration, justMark, mergeDup bool) func(in <-chan []*Record, out chan<- []*Record) {
+func Dedupe(expireTime time.Duration, justMark, mergeDup bool, ifaceNamer InterfaceNamer) func(in <-chan []*Record, out chan<- []*Record) {
 	cache := &deduperCache{
 		expire:  expireTime,
 		entries: list.New(),
@@ -51,7 +50,7 @@ func Dedupe(expireTime time.Duration, justMark, mergeDup bool) func(in <-chan []
 			cache.removeExpired()
 			fwd := make([]*Record, 0, len(records))
 			for _, record := range records {
-				cache.checkDupe(record, justMark, mergeDup, &fwd)
+				cache.checkDupe(record, justMark, mergeDup, &fwd, ifaceNamer)
 			}
 			if len(fwd) > 0 {
 				out <- fwd
@@ -61,7 +60,7 @@ func Dedupe(expireTime time.Duration, justMark, mergeDup bool) func(in <-chan []
 }
 
 // checkDupe check current record if its already available nad if not added to fwd records list
-func (c *deduperCache) checkDupe(r *Record, justMark, mergeDup bool, fwd *[]*Record) {
+func (c *deduperCache) checkDupe(r *Record, justMark, mergeDup bool, fwd *[]*Record, ifaceNamer InterfaceNamer) {
 	mergeEntry := make(map[string]uint8)
 	rk := r.Id
 	// zeroes fields from key that should be ignored from the flow comparison
@@ -95,7 +94,7 @@ func (c *deduperCache) checkDupe(r *Record, justMark, mergeDup bool, fwd *[]*Rec
 				*fwd = append(*fwd, r)
 			}
 			if mergeDup {
-				ifName := utils.GetInterfaceName(r.Id.IfIndex)
+				ifName := ifaceNamer(int(r.Id.IfIndex))
 				mergeEntry[ifName] = r.Id.Direction
 				if dupEntryNew(*fEntry.dupList, mergeEntry) {
 					*fEntry.dupList = append(*fEntry.dupList, mergeEntry)
@@ -122,7 +121,7 @@ func (c *deduperCache) checkDupe(r *Record, justMark, mergeDup bool, fwd *[]*Rec
 		expiryTime: timeNow().Add(c.expire),
 	}
 	if mergeDup {
-		ifName := utils.GetInterfaceName(r.Id.IfIndex)
+		ifName := ifaceNamer(int(r.Id.IfIndex))
 		mergeEntry[ifName] = r.Id.Direction
 		r.DupList = append(r.DupList, mergeEntry)
 		e.dupList = &r.DupList

pkg/flow/deduper_test.go

 package flow
 
 import (
+	"net"
 	"testing"
 	"time"
 
 	"github.com/stretchr/testify/assert"
 
 	"github.com/netobserv/netobserv-ebpf-agent/pkg/ebpf"
-	"github.com/netobserv/netobserv-ebpf-agent/pkg/utils"
 )
 
 var (
@@ -70,7 +70,7 @@ func TestDedupe(t *testing.T) {
 	input := make(chan []*Record, 100)
 	output := make(chan []*Record, 100)
 
-	go Dedupe(time.Minute, false, false)(input, output)
+	go Dedupe(time.Minute, false, false, interfaceNamer)(input, output)
 
 	input <- []*Record{
 		oneIf2,   // record 1 at interface 2: should be accepted
@@ -108,7 +108,7 @@ func TestDedupe_EvictFlows(t *testing.T) {
 	input := make(chan []*Record, 100)
 	output := make(chan []*Record, 100)
 
-	go Dedupe(15*time.Second, false, false)(input, output)
+	go Dedupe(15*time.Second, false, false, interfaceNamer)(input, output)
 
 	// Should only accept records 1 and 2, at interface 1
 	input <- []*Record{oneIf1, twoIf1, oneIf2}
@@ -143,7 +143,7 @@ func TestDedupeMerge(t *testing.T) {
 	input := make(chan []*Record, 100)
 	output := make(chan []*Record, 100)
 
-	go Dedupe(time.Minute, false, true)(input, output)
+	go Dedupe(time.Minute, false, true, interfaceNamer)(input, output)
 
 	input <- []*Record{
 		oneIf2, // record 1 at interface 2: should be accepted
@@ -155,10 +155,10 @@ func TestDedupeMerge(t *testing.T) {
 
 	expectedMap := []map[string]uint8{
 		{
-			utils.GetInterfaceName(oneIf2.Id.IfIndex): oneIf2.Id.Direction,
+			interfaceNamer(int(oneIf2.Id.IfIndex)): oneIf2.Id.Direction,
 		},
 		{
-			utils.GetInterfaceName(oneIf1.Id.IfIndex): oneIf1.Id.Direction,
+			interfaceNamer(int(oneIf1.Id.IfIndex)): oneIf1.Id.Direction,
 		},
 	}
 
@@ -174,3 +174,11 @@ type timerMock struct {
 func (tm *timerMock) Now() time.Time {
 	return tm.now
 }
+
+func interfaceNamer(ifIndex int) string {
+	iface, err := net.InterfaceByIndex(ifIndex)
+	if err != nil {
+		return "unknown"
+	}
+	return iface.Name
+}

pkg/utils/utils.go

@@ -91,11 +91,3 @@ func utsnameStr[T int8 | uint8](in []T) string {
 	}
 	return string(out)
 }
-
-func GetInterfaceName(ifIndex uint32) string {
-	iface, err := net.InterfaceByIndex(int(ifIndex))
-	if err != nil {
-		return "unknown"
-	}
-	return iface.Name
-}