don't reset buffer on exception

libp2p/connection.nim

@@ -100,7 +100,6 @@ proc readLp*(s: Connection): Future[seq[byte]] {.async, gcsafe.} =
       await s.readExactly(addr buffer[0], int(size))
   except LPStreamIncompleteError, LPStreamReadError:
     error "readLp: could not read from remote", exception = getCurrentExceptionMsg()
-    buffer.setLen(0)
   
   result = buffer
 

libp2p/muxers/mplex/coder.nim

@@ -41,7 +41,7 @@ proc readMplexVarint(conn: Connection): Future[Option[uint]] {.async, gcsafe.} =
       buffer.setLen(0)
       return
   except LPStreamIncompleteError:
-    buffer.setLen(0)
+    debug "unable to read varing", exc = getCurrentExceptionMsg()
 
 proc readMsg*(conn: Connection): Future[Option[Msg]] {.async, gcsafe.} = 
   let headerVarint = await conn.readMplexVarint()