From 5448b623bdbeec6efd2c99dc2b04e778bc019136 Mon Sep 17 00:00:00 2001
From: Dmitriy Ryajov <dryajov@gmail.com>
Date: Tue, 25 Jan 2022 10:05:17 -0600
Subject: [PATCH] avoid spin/live-lock on 0 bytes read

---
 websock/session.nim | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/websock/session.nim b/websock/session.nim
index 6af9e770..4978f959 100644
--- a/websock/session.nim
+++ b/websock/session.nim
@@ -399,6 +399,9 @@ proc recvMsg*(
       var buf = newSeq[byte](min(size, ws.frameSize))
       let read = await ws.recv(addr buf[0], buf.len)
 
+      if read <= 0:
+        return res
+
       buf.setLen(read)
       if res.len + buf.len > size:
         raise newException(WSMaxMessageSizeError, "Max message size exceeded")