From 3fc60cb312a74f2340e0c712bc799bda6df82c44 Mon Sep 17 00:00:00 2001
From: mhchia <kevin.mh.chia@gmail.com>
Date: Tue, 4 Feb 2020 17:04:28 +0800
Subject: [PATCH] SwarmConn: iterate `streams.copy` in `_cleanup`

To avoid `RuntimeError` if `streams` is changed.
---
 libp2p/network/connection/swarm_connection.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libp2p/network/connection/swarm_connection.py b/libp2p/network/connection/swarm_connection.py
index a5e22e7..0e930f5 100644
--- a/libp2p/network/connection/swarm_connection.py
+++ b/libp2p/network/connection/swarm_connection.py
@@ -46,7 +46,7 @@ class SwarmConn(INetConn):
 
         # This is just for cleaning up state. The connection has already been closed.
         # We *could* optimize this but it really isn't worth it.
-        for stream in self.streams:
+        for stream in self.streams.copy():
             await stream.reset()
         # Force context switch for stream handlers to process the stream reset event we just emit
         # before we cancel the stream handler tasks.