[Bug Report] miner_client can not submit seal

[sanlee42]

Bug Report

Starcoin version:
升级actix 版本到0.13之后. #3271

Current behavior:
starcoin_miner client 无法提交 seal, 能获取到job, 但计算出来的 seal 无法提交至 starcoin node stratum service.

Steps to reproduce:

./target/debug/starcoin -n mychain:253 --genesis-config halley
RUST_LOG=debug ./target/debug/starcoin_miner  -u fikgol -a 127.0.0.1:9880 -n 4

可以观察到所有出块都是 starcoin node, starcoin_miner 能计算,但无法提交seal。

Related code:
cmd/miner_client/src/stratum_client_service.rs

impl ServiceHandler<StratumClientService, SubmitSealRequest> for StratumClientService {
    fn handle(
        &mut self,
        msg: SubmitSealRequest,
        _ctx: &mut ServiceContext<StratumClientService>,
    ) -> <SubmitSealRequest as ServiceRequest>::Response {
        //FIXME: Failed to receive this msg since upgrade actix to 0.13.
        if let Some(sender) = self.sender.clone().take() {
            if let Err(e) = sender.unbounded_send(Request::SubmitSealRequest(msg)) {
                error!("stratum handle submit seal request failed:{}", e);
            }
        } else {
            unreachable!()
        }
    }
}

the SubmitSealRequest message 的 handle 逻辑无法永远无法触发。

消息的发送端: cmd/miner_client/src/stratum_client.rs

    async fn submit_seal(&self, seal: SealEvent) -> Result<()> {
        let srv = self.stratum_cli_srv.clone();
        let mut n = Vec::new();
        n.write_u32::<LittleEndian>(seal.nonce)?;
        let nonce = hex::encode(n);
        let mint_extra = seal
            .extra
            .ok_or_else(|| anyhow::anyhow!("submit missing field"))?;
        if let Err(e) = srv.try_send(SubmitSealRequest(ShareRequest {
            id: mint_extra.worker_id,
            job_id: mint_extra.job_id,
            nonce,
            result: seal.hash_result,
        })) {
            error!("failed to submit seal request {:?}", e);
        }
        Ok(())
    }

如果send message 改成async 的

srv.send(SubmitSealRequest(ShareRequest {
            id: mint_extra.worker_id,
            job_id: mint_extra.job_id,
            nonce,
            result: seal.hash_result,
        })).await

则这里会一直卡住，无法返回。

改成srv.do_send则不会卡住，但是也没有报错。但依旧无法触发messge handle