From 703e67e5211722749efc08432a8fb1023df8241c Mon Sep 17 00:00:00 2001
From: Zsolt Felfoldi <zsfelfoldi@gmail.com>
Date: Sun, 3 Nov 2019 01:21:16 +0100
Subject: [PATCH] les: keep pos balance entry if meta field is not empty

---
 les/clientpool.go | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/les/clientpool.go b/les/clientpool.go
index 78b24fe3e7..ac9a2e3bc9 100644
--- a/les/clientpool.go
+++ b/les/clientpool.go
@@ -451,7 +451,9 @@ func (f *clientPool) balanceExhausted(id enode.ID) {
 		c.capacity = f.freeClientCap
 		c.peer.updateCapacity(c.capacity)
 	}
-	f.ndb.delPB(id)
+	pb := f.ndb.getOrNewPB(id)
+	pb.value = 0
+	f.ndb.setPB(id, pb)
 	if f.eventHook != nil {
 		f.eventHook("balanceExhausted", c)
 	}
@@ -740,6 +742,10 @@ func (db *nodeDB) getOrNewPB(id enode.ID) posBalance {
 }
 
 func (db *nodeDB) setPB(id enode.ID, b posBalance) {
+	if b.value == 0 && len(b.meta) == 0 {
+		db.delPB(id)
+		return
+	}
 	key := db.key(id.Bytes(), false)
 	enc, err := rlp.EncodeToBytes(&(b))
 	if err != nil {