p2p/discover: add support for counting findnode failures

p2p/discover/database.go

@@ -44,9 +44,10 @@ var (
 	nodeDBVersionKey = []byte("version") // Version of the database to flush if changes
 	nodeDBItemPrefix = []byte("n:")      // Identifier to prefix node entries with
 
-	nodeDBDiscoverRoot = ":discover"
-	nodeDBDiscoverPing = nodeDBDiscoverRoot + ":lastping"
-	nodeDBDiscoverPong = nodeDBDiscoverRoot + ":lastpong"
+	nodeDBDiscoverRoot      = ":discover"
+	nodeDBDiscoverPing      = nodeDBDiscoverRoot + ":lastping"
+	nodeDBDiscoverPong      = nodeDBDiscoverRoot + ":lastpong"
+	nodeDBDiscoverFindFails = nodeDBDiscoverRoot + ":findfail"
 )
 
 // newNodeDB creates a new node database for storing and retrieving infos about
@@ -275,6 +276,16 @@ func (db *nodeDB) updateLastPong(id NodeID, instance time.Time) error {
 	return db.storeInt64(makeKey(id, nodeDBDiscoverPong), instance.Unix())
 }
 
+// findFails retrieves the number of findnode failures since bonding.
+func (db *nodeDB) findFails(id NodeID) int {
+	return int(db.fetchInt64(makeKey(id, nodeDBDiscoverFindFails)))
+}
+
+// updateFindFails updates the number of findnode failures since bonding.
+func (db *nodeDB) updateFindFails(id NodeID, fails int) error {
+	return db.storeInt64(makeKey(id, nodeDBDiscoverFindFails), int64(fails))
+}
+
 // querySeeds retrieves a batch of nodes to be used as potential seed servers
 // during bootstrapping the node into the network.
 //

p2p/discover/database_test.go

@@ -93,6 +93,7 @@ func TestNodeDBFetchStore(t *testing.T) {
 		30303,
 	)
 	inst := time.Now()
+	num := 314
 
 	db, _ := newNodeDB("", Version, NodeID{})
 	defer db.close()
@@ -117,6 +118,16 @@ func TestNodeDBFetchStore(t *testing.T) {
 	if stored := db.lastPong(node.ID); stored.Unix() != inst.Unix() {
 		t.Errorf("pong: value mismatch: have %v, want %v", stored, inst)
 	}
+	// Check fetch/store operations on a node findnode-failure object
+	if stored := db.findFails(node.ID); stored != 0 {
+		t.Errorf("find-node fails: non-existing object: %v", stored)
+	}
+	if err := db.updateFindFails(node.ID, num); err != nil {
+		t.Errorf("find-node fails: failed to update: %v", err)
+	}
+	if stored := db.findFails(node.ID); stored != num {
+		t.Errorf("find-node fails: value mismatch: have %v, want %v", stored, num)
+	}
 	// Check fetch/store operations on an actual node object
 	if stored := db.node(node.ID); stored != nil {
 		t.Errorf("node: non-existing object: %v", stored)