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fix newPendingTransactions subscription deadlock issue (#933)

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crypto-facs 2022-02-09 21:10:37 -05:00 committed by GitHub
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commit e16b7f8ab0
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2 changed files with 10 additions and 1 deletions
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1
CHANGELOG.md
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@ -78,6 +78,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
* (evm) [tharsis#871](https://github.com/tharsis/ethermint/pull/871) Set correct nonce in `EthCall` and `EstimateGas` grpc query.
* (rpc) [tharsis#878](https://github.com/tharsis/ethermint/pull/878) Workaround to make GetBlock RPC api report correct block gas used.
* (rpc) [tharsis#900](https://github.com/tharsis/ethermint/pull/900) newPendingTransactions filter return ethereum tx hash.
* (rpc) [tharsis#933](https://github.com/tharsis/ethermint/pull/933) Fix newPendingTransactions subscription deadlock when a Websocket client exits without unsubscribing and the node errors.
## [v0.9.0] - 2021-12-01

10
rpc/websockets.go
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@ -712,8 +712,16 @@ func (api *pubSubAPI) subscribePendingTransactions(wsConn *wsConn) (rpc.ID, erro
api.logger.Debug("error writing header, will drop peer", "error", err.Error())
try(func() {
// Release the initial read lock in .RUnlock() before
// invoking .Lock() to avoid the deadlock in
// https://github.com/tharsis/ethermint/issues/821#issuecomment-1033959984
// and as documented at https://pkg.go.dev/sync#RWMutex
api.filtersMu.RUnlock()
api.filtersMu.Lock()
defer api.filtersMu.Unlock()
defer func() {
api.filtersMu.Unlock()
api.filtersMu.RLock()
}()
if err != websocket.ErrCloseSent {
_ = wsSub.wsConn.Close()