bugfix: gracefull shutdown #13
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Description
delete(ps.diffWait, id) while the handshake fails on handler_diff.go
Rationale
The preceding error occurs multiple times when node stop(). Wait channel in waitDiffExtension can't exit normally.
In runEthPeer of eth/handler.go, if the peer has a diff extension, wait for it to connect through peerset.diffWait channel.
While RunPeer of eth/handler_diff.go runs, if the peer.Handshake is successful, peerset.diffWait[id] will exit and be removed. If it it not successful, peerset.diffWait[id] on waitDiffExtension will keep waiting. Which caused graceful shutdown cannot be enabled