Expose transaction size to tx submission #4926
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| -> (tx -> SizeInBytes) -- ^ get size of CBOR encoded transaction | ||
| -> NodeToNodeVersion | ||
| -> ControlMessageSTM m | ||
| -> TxSubmissionClient txid tx m () | ||
| txSubmissionOutbound tracer maxUnacked TxSubmissionMempoolReader{..} _version controlMessageSTM = | ||
| txSubmissionOutbound tracer maxUnacked TxSubmissionMempoolReader{..} _txSize _version controlMessageSTM = |
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Does the outbound side need the callback, or can we use the sizes from the mempool?
Maybe we should change the mempool interface, to give us just [txid]s rather than [(txid, SizeInBytes)] - so we don't have multiple ways of getting that information, possibly in a non-compatible way.
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Essentially, the callback does provide the size of the transaction as it is when stored in the mempool, except for the hash because it is not part of the transaction when crossing the network. I think your second remark is accurate.
[edit] Very possibly the hash is not stored in the mempool either - but I'd have to double check - because it can be recovered from the BodyTx component, so this would be the true size of the transaction.
| txSubmissionInbound tracer (NumTxIdsToAck maxUnacked) mpReader mpWriter _version = | ||
| txSubmissionInbound tracer (NumTxIdsToAck maxUnacked) mpReader mpWriter _txSize _version = |
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Can we verify the tx sizes using an assert-ion? I'd expect that production nodes run without assertions, and this would give us a chance to verify that this works well.
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Good idea - @karknu commented on slack I think that this maybe should be in an #ifdef.
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I don't think we need CPP for it, assert-tions are only enforced if one compiled the node with -fno-ignore-asserts flag.
Description
A callback, exposing CBOR-encoded transaction size as it is when transmitted over the network, is provided to
tx submission inbound and outbound handlers. The size returned by this function does not take into account some additional wrapping that happens when a transaction is sent across the network. Namely, it does not include header data for CBOR-in-CBOR encoding (a tag + it's value to indicate a blob payload, and an encodeBytes tag ~ so roughly 3 words) neither the top level header which consists of EncodeListLen tag + it's value, era word tag + era index word, so ~4 words).
IntersectMBO/cardano-ledger#4521
IntersectMBO/ouroboros-consensus#1211
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