fw: prevent goroutine in non fw apps

fw/executor/yanfd.go

@@ -47,6 +47,7 @@ func NewYaNFD(config *core.Config) *YaNFD {
 
 	// Initialize all modules here
 	core.OpenLogger()
+	face.Initialize()
 	table.Initialize()
 
 	return &YaNFD{

fw/face/config.go

@@ -14,6 +14,12 @@ import (
 	"github.com/named-data/ndnd/fw/core"
 )
 
+// Initialize initializes the face module.
+func Initialize() {
+	FaceTable.nextFaceID.Store(1)
+	go FaceTable.expirationHandler()
+}
+
 // CfgFaceQueueSize returns the maximum number of packets that can be buffered
 // to be sent or received on a face.
 func CfgFaceQueueSize() int {

fw/face/table.go

@@ -24,12 +24,7 @@ var FaceTable Table
 // Table hold all faces used by the forwarder.
 type Table struct {
 	faces      sync.Map
-	nextFaceID atomic.Uint64
-}
-
-func init() {
-	FaceTable.nextFaceID.Store(1)
-	go FaceTable.expirationHandler()
+	nextFaceID atomic.Uint64 // starts at 1
 }
 
 func (t *Table) String() string {
@@ -87,6 +82,7 @@ func (t *Table) Remove(id uint64) {
 }
 
 // expirationHandler stops the faces that have expired
+// Runs in a separate goroutine called from Initialize()
 func (t *Table) expirationHandler() {
 	for !core.ShouldQuit {
 		// Check for expired faces every 10 seconds