blockprod: Ability to specify custom transactions #1270
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iljakuklic
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iljakuklic
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alfiedotwtf,
OBorce,
TheQuantumPhysicist and
azarovh
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| // TODO: Alternatively, we can construct the transaction sequence from | ||
| // scratch every time a different timestamp is attempted. That is more costly | ||
| // in terms of computational resources but will allow the node to include more | ||
| // transactions since the passing time may release some time locks. |
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Going through the above code and then this change, I'm thinking that the minimum here should be MIN(last_timestamp_seconds_used, min_constructed_block_timestamp) given that transactions may be earlier than min_constructed_block_timestamp.
min_contstructed_block_timestamp should probably by locally scoped to the construction of max_constructed_block_timestamp as it's only used to calculate that value.
mempool/src/pool/collet_txs.rs
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| // Set of transactions already placed into the accumulator | ||
| let mut emitted: BTreeSet<_> = accum_ids.iter().collect(); | ||
| // Set of already processed transactions, for de-duplication | ||
| let mut processed = emitted.clone(); |
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Race condition fix in 22940c6 looks good |
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Apparently, the mempool sync issue resurfaced also in functional tests, need to fix it up. |
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| accumulator | ||
| .add_tx(transaction, Amount::ZERO.into()) | ||
| .map_err(|err| BlockProductionError::FailedToAddTransaction(transaction_id, err))? |
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How are we making sure that these raw transactions are valid against what's coming from the mempool? I do hope we're not depending on the temporary solution we deployed that we wanted to solve later, where we include a transaction verifier inside the accumulator.
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There is no guarantee currently. Even transaction verifier is not sufficient because mempool deps are used to figure out the parent/child relationships. So it only properly works for transactions that are "independent" of transactions in the mempool. Could be removed since the guarantees are much weaker than for transactions specified by IDs.
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I thought we agreed to just remove it...
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I thought we agreed to just remove it...
Ok will do.
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Hmm there are many existing functional tests that rely on this functionality, and some are not easy to adapt so the transactions can be pushed through mempool.
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Let's just keep it, and write in the documentation that adding transactions there relies on the user ensuring the validity, and is done only in testing.
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I took a round and it looks fine. I just don't understand the consistency guarantees we're having on transactions. Besides that and the comments, looking good. |
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This gives the user the option to add a custom list of transactions when asking the node to generate a new block. Based on the original work of @alfiedotwtf.
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This gives the user the option to add a custom list of transactions when asking the node to generate a new block.
Based on the original work of @alfiedotwtf.
Related: