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Allow error responses for BeginBlock and EndBlock #3755

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ggarri opened this issue Jun 26, 2019 · 6 comments
Closed

Allow error responses for BeginBlock and EndBlock #3755

ggarri opened this issue Jun 26, 2019 · 6 comments

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@ggarri
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ggarri commented Jun 26, 2019 •
edited

Description

At the current implementation of an ABCI Application it is not allowed to return errors, although the ABCI LocalClient does implement the error output. Implementation has been pasted below for verification.

As far as my understanding is, in the current implementation it is not possible to reject/deny a new block in case the block headers are not compliant with the application logic.

For instance, in my particular case, we implement an ethereum compatible blockchain and there is a restriction/validation to not have two consecutive blocks in the same second, and that cannot be prevented with the current implementation.

Code

github.com/tendermint/tendermint/abci/types/application.go

type Application interface {
	// Info/Query Connection
	Info(RequestInfo) ResponseInfo                // Return application info
	SetOption(RequestSetOption) ResponseSetOption // Set application option
	Query(RequestQuery) ResponseQuery             // Query for state

	// Mempool Connection
	CheckTx(tx []byte) ResponseCheckTx // Validate a tx for the mempool

	// Consensus Connection
	InitChain(RequestInitChain) ResponseInitChain    // Initialize blockchain with validators and other info from TendermintCore
	BeginBlock(RequestBeginBlock) ResponseBeginBlock // Signals the beginning of a block
	DeliverTx(tx []byte) ResponseDeliverTx           // Deliver a tx for full processing
	EndBlock(RequestEndBlock) ResponseEndBlock       // Signals the end of a block, returns changes to the validator set
	Commit() ResponseCommit                          // Commit the state and return the application Merkle root hash
}

github.com/tendermint/tendermint/abci/types/local_client.go

func (app *localClient) BeginBlockSync(req types.RequestBeginBlock) (*types.ResponseBeginBlock, error) {
	app.mtx.Lock()
	res := app.Application.BeginBlock(req)
	app.mtx.Unlock()
	return &res, nil
}
@melekes
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melekes commented Jun 27, 2019

to not have two consecutive blocks in the same second, and that cannot be prevented with the current implementation.

You can use time_iota_ms to control min time between two consecutive blocks

"consensus_params": {
    "block": {
      ...
      "time_iota_ms": "1000"
    }
    ...

@ggarri ggarri mentioned this issue Jun 27, 2019
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@ggarri
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ggarri commented Jun 27, 2019

Hi @melekes

Thanks for the quick response. We already did that setup for our network as you can see from our genesis definition here. Also at our config.toml we got the following config:

# Block time parameters. Corresponds to the minimum time increment between consecutive blocks.
blocktime_iota = "1s"

But even having that setup two blocks were generated on the same second. At the following wal log you can see how blocks 448299 and 448300 were generated in the second 2019-06-21T11:59:41.

ENDHEIGHT 448298
{"time":"2019-06-21T11:59:41.406323507Z","msg":{"type":"tendermint/wal/EventDataRoundState","value":{"height":"448299","round":"0","step":"RoundStepNewHeight"}}}
{"time":"2019-06-21T11:59:41.406484538Z","msg":{"type":"tendermint/wal/EventDataRoundState","value":{"height":"448299","round":"0","step":"RoundStepPropose"}}}
{"time":"2019-06-21T11:59:41.444441764Z","msg":{"type":"tendermint/wal/MsgInfo","value":{"msg":{"type":"tendermint/Vote","value":{"Vote":{"type":2,"height":"448298","round":"0","block_id":{"hash":"E15AB95DC5A544E21598DD6C69EA6308ABA320026F373E186FF07439F1663D18","parts":{"total":"1","hash":"6734D65D34904CDEE71C1CC59A7262C4910701F5671FA5D763B06514D8495C6B"}},"timestamp":"2019-06-21T11:59:41.078920915Z","validator_address":"9A171D8706D6E09BE57326402D231B969DF5D872","validator_index":"2","signature":"+AJJuIGHAn9lz6brE587uFvwc82prtCKr8JsikJmRpmdYXX+FWSI28h5BXuxVw90a0SvKfYVhnGQuyx0DDrcAg=="}}},"peer_key":"0f04a32ffd95529c277e92aa9f006cc613595e54"}}}
{"time":"2019-06-21T11:59:41.444472213Z","msg":{"type":"tendermint/wal/MsgInfo","value":{"msg":{"type":"tendermint/Vote","value":{"Vote":{"type":2,"height":"448298","round":"0","block_id":{"hash":"E15AB95DC5A544E21598DD6C69EA6308ABA320026F373E186FF07439F1663D18","parts":{"total":"1","hash":"6734D65D34904CDEE71C1CC59A7262C4910701F5671FA5D763B06514D8495C6B"}},"timestamp":"2019-06-21T11:59:41.074198765Z","validator_address":"B7DFDC424F64EC89C42A502F89EB29F811144CA1","validator_index":"3","signature":"hh9lujKYoT9c8Qop1Dpo3vWOTfBdqGcGVQB9Nb4CsKMn28Mhw++31PB71jNeara+ZQt17hx23A5PC/egsJmxBA=="}}},"peer_key":"0f04a32ffd95529c277e92aa9f006cc613595e54"}}}
{"time":"2019-06-21T11:59:41.641748682Z","msg":{"type":"tendermint/wal/MsgInfo","value":{"msg":{"type":"tendermint/Proposal","value":{"Proposal":{"Type":32,"height":"448299","round":"0","pol_round":"-1","block_id":{"hash":"7D58F95FA33ECD9646BE29500351495651FBB686A99DB3A81FAAB43B979359A7","parts":{"total":"1","hash":"B8EF60301E115FC2C0DB37DCD74E5F9DDB46BD4B060C706726CABBD40308B43A"}},"timestamp":"2019-06-21T11:59:41.34699815Z","signature":"AiWXyGgx/6nmI88I7Ejzx9GXzZtbVoeq0br3650ED9LiL5wEv06aE8pcOTlyA6U76ZUOt00OTAurJzRPNuaAAw=="}}},"peer_key":"0f04a32ffd95529c277e92aa9f006cc613595e54"}}}
{"time":"2019-06-21T11:59:41.643268279Z","msg":{"type":"tendermint/wal/MsgInfo","value":{"msg":{"type":"tendermint/BlockPart","value":{"Height":"448299","Round":"0","Part":{"index":"0","bytes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proof":{"total":"1","index":"0","leaf_hash":"uO9gMB4RX8LA2zfc105fndtGvUsGDHBnJsq71AMItDo=","aunts":null}}}},"peer_key":"0f04a32ffd95529c277e92aa9f006cc613595e54"}}}
{"time":"2019-06-21T11:59:41.644737157Z","msg":{"type":"tendermint/wal/EventDataRoundState","value":{"height":"448299","round":"0","step":"RoundStepPrevote"}}}
{"time":"2019-06-21T11:59:41.64478298Z","msg":{"type":"tendermint/wal/MsgInfo","value":{"msg":{"type":"tendermint/Vote","value":{"Vote":{"type":1,"height":"448299","round":"0","block_id":{"hash":"7D58F95FA33ECD9646BE29500351495651FBB686A99DB3A81FAAB43B979359A7","parts":{"total":"1","hash":"B8EF60301E115FC2C0DB37DCD74E5F9DDB46BD4B060C706726CABBD40308B43A"}},"timestamp":"2019-06-21T11:59:41.385770115Z","validator_address":"9A171D8706D6E09BE57326402D231B969DF5D872","validator_index":"2","signature":"b+dkEayqYjuSHy/J0manKxQpD3ThMYtwaI/Mk+aP6ngWl3mbCMK2a+vsgdwubAMI1e96ajk6JMdS2soN1Y3BCw=="}}},"peer_key":"0f04a32ffd95529c277e92aa9f006cc613595e54"}}}
{"time":"2019-06-21T11:59:41.668486684Z","msg":{"type":"tendermint/wal/MsgInfo","value":{"msg":{"type":"tendermint/Proposal","value":{"Proposal":{"Type":32,"height":"448299","round":"0","pol_round":"-1","block_id":{"hash":"7D58F95FA33ECD9646BE29500351495651FBB686A99DB3A81FAAB43B979359A7","parts":{"total":"1","hash":"B8EF60301E115FC2C0DB37DCD74E5F9DDB46BD4B060C706726CABBD40308B43A"}},"timestamp":"2019-06-21T11:59:41.34699815Z","signature":"AiWXyGgx/6nmI88I7Ejzx9GXzZtbVoeq0br3650ED9LiL5wEv06aE8pcOTlyA6U76ZUOt00OTAurJzRPNuaAAw=="}}},"peer_key":"4172cede3e68412577965d0655597b9a7f235820"}}}
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{"time":"2019-06-21T11:59:41.669136647Z","msg":{"type":"tendermint/wal/MsgInfo","value":{"msg":{"type":"tendermint/Vote","value":{"Vote":{"type":1,"height":"448299","round":"0","block_id":{"hash":"7D58F95FA33ECD9646BE29500351495651FBB686A99DB3A81FAAB43B979359A7","parts":{"total":"1","hash":"B8EF60301E115FC2C0DB37DCD74E5F9DDB46BD4B060C706726CABBD40308B43A"}},"timestamp":"2019-06-21T11:59:41.385770115Z","validator_address":"9A171D8706D6E09BE57326402D231B969DF5D872","validator_index":"2","signature":"b+dkEayqYjuSHy/J0manKxQpD3ThMYtwaI/Mk+aP6ngWl3mbCMK2a+vsgdwubAMI1e96ajk6JMdS2soN1Y3BCw=="}}},"peer_key":"4172cede3e68412577965d0655597b9a7f235820"}}}
{"time":"2019-06-21T11:59:41.74305026Z","msg":{"type":"tendermint/wal/MsgInfo","value":{"msg":{"type":"tendermint/Vote","value":{"Vote":{"type":1,"height":"448299","round":"0","block_id":{"hash":"7D58F95FA33ECD9646BE29500351495651FBB686A99DB3A81FAAB43B979359A7","parts":{"total":"1","hash":"B8EF60301E115FC2C0DB37DCD74E5F9DDB46BD4B060C706726CABBD40308B43A"}},"timestamp":"2019-06-21T11:59:41.446630258Z","validator_address":"2DE3B810E4EAC51A10A3740D15AE92142B01DC7B","validator_index":"1","signature":"874aeWS9acK93V38v/KNiyyTJgHdcUCPX596L+MxG5Zce5crRPrTHPUN8LhmpNqBDe1sZWY2iuyD00GpljcuDw=="}}},"peer_key":"0f04a32ffd95529c277e92aa9f006cc613595e54"}}}
{"time":"2019-06-21T11:59:41.743504856Z","msg":{"type":"tendermint/wal/MsgInfo","value":{"msg":{"type":"tendermint/Vote","value":{"Vote":{"type":1,"height":"448299","round":"0","block_id":{"hash":"7D58F95FA33ECD9646BE29500351495651FBB686A99DB3A81FAAB43B979359A7","parts":{"total":"1","hash":"B8EF60301E115FC2C0DB37DCD74E5F9DDB46BD4B060C706726CABBD40308B43A"}},"timestamp":"2019-06-21T11:59:41.541968992Z","validator_address":"B7DFDC424F64EC89C42A502F89EB29F811144CA1","validator_index":"3","signature":"536TxvR2lZ2pnVPtioEgvhEew/cZAtCPxDmo6y6IygvUWk54NqxZrftGHSqQCCbKPKd2v9Ahxu1ENe9645QGAA=="}}},"peer_key":"0f04a32ffd95529c277e92aa9f006cc613595e54"}}}
{"time":"2019-06-21T11:59:41.744813425Z","msg":{"type":"tendermint/wal/EventDataRoundState","value":{"height":"448299","round":"0","step":"RoundStepPrecommit"}}}
{"time":"2019-06-21T11:59:41.776091151Z","msg":{"type":"tendermint/wal/MsgInfo","value":{"msg":{"type":"tendermint/Vote","value":{"Vote":{"type":1,"height":"448299","round":"0","block_id":{"hash":"7D58F95FA33ECD9646BE29500351495651FBB686A99DB3A81FAAB43B979359A7","parts":{"total":"1","hash":"B8EF60301E115FC2C0DB37DCD74E5F9DDB46BD4B060C706726CABBD40308B43A"}},"timestamp":"2019-06-21T11:59:41.541968992Z","validator_address":"B7DFDC424F64EC89C42A502F89EB29F811144CA1","validator_index":"3","signature":"536TxvR2lZ2pnVPtioEgvhEew/cZAtCPxDmo6y6IygvUWk54NqxZrftGHSqQCCbKPKd2v9Ahxu1ENe9645QGAA=="}}},"peer_key":"4172cede3e68412577965d0655597b9a7f235820"}}}
{"time":"2019-06-21T11:59:41.776139098Z","msg":{"type":"tendermint/wal/MsgInfo","value":{"msg":{"type":"tendermint/Vote","value":{"Vote":{"type":1,"height":"448299","round":"0","block_id":{"hash":"7D58F95FA33ECD9646BE29500351495651FBB686A99DB3A81FAAB43B979359A7","parts":{"total":"1","hash":"B8EF60301E115FC2C0DB37DCD74E5F9DDB46BD4B060C706726CABBD40308B43A"}},"timestamp":"2019-06-21T11:59:41.446630258Z","validator_address":"2DE3B810E4EAC51A10A3740D15AE92142B01DC7B","validator_index":"1","signature":"874aeWS9acK93V38v/KNiyyTJgHdcUCPX596L+MxG5Zce5crRPrTHPUN8LhmpNqBDe1sZWY2iuyD00GpljcuDw=="}}},"peer_key":"4172cede3e68412577965d0655597b9a7f235820"}}}
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ENDHEIGHT 448300

@ggarri
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ggarri commented Jun 27, 2019

Independently whether or not time_iota_ms is working correctly, my question is also, should it the application layer be capable to reject a block before consensus is achieved?

@melekes
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melekes commented Jun 27, 2019

#1909 is somewhat related

@ebuchman
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ebuchman commented Jul 3, 2019

my question is also, should it the application layer be capable to reject a block before consensus is achieved?

This was an early design decision to process blocks after there is consensus. This means some txs may be invalid. There's been some discussion about at least running checktx before voting to avoid invalid txs. There's also https://github.com/tendermint/tendermint/issues/2639

In any case, until then, it's not clear it would make sense for begin/endblock to return errors as there's no way for tendermint to handle them, since the block was already committed!

Do you think we can close this?

@ggarri
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ggarri commented Jul 3, 2019

That matches with my latest findings after reverse engineering the code which creates, approve and persists the blocks.

As there is no pending work to do on this issue and question was answered I proceed to close the issue.

Thanks for the clarification @ebuchman

@ggarri ggarri closed this as completed Jul 3, 2019
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