bitcoind RPC: Make mempool syncing more efficient#465
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tnull merged 3 commits intolightningdevkit:mainfrom Feb 12, 2025
Merged
bitcoind RPC: Make mempool syncing more efficient#465tnull merged 3 commits intolightningdevkit:mainfrom
tnull merged 3 commits intolightningdevkit:mainfrom
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Querying the mempool unfortunately takes multiple sequential steps: first we call `getrawmempool` to retrieve a list of all entries and then retrieve all of them via `getmempoolentry`. Previously, we would error out if a previously retrieved `Txid` wouldn't be available anymore at the second step. Here, we ensure smooth continuation by simply skipping any entries we can't retrieve anymore.
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Previously, we would retransmit entry and transaction data whenever polling for mempool data. Here we introduce simple caches for both, so most data is only retrieved in bulk on the first iteration after startup.
.. including `TRACE` logs of relevant interval times
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| mempool_txs_cache.insert(entry.txid, (tx.clone(), entry.time)); | ||
| txs_to_emit.push((tx, entry.time)); | ||
| }, | ||
| Ok(None) => { |
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should the case of having a txid among the mempool entries but not being able to find its full tx hex be handled somehow?
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Well, we handle it by skipping :)
Note that we used to log/error out in some of these races, but its exactly the point to get rid of that behavior in this PR. In fact, turns out you'll regularly run into these races between getrawmempool/getmempoolentry and getmempoolentry/getrawtransaction, since entries are dropped often from the mempool. So we can just skip processing them and will re-detect them if they would reappear in the mempool.
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Querying the mempool unfortunately takes multiple sequential steps:
first we call
getrawmempoolto retrieve a list of all entries and thenretrieve all of them via
getmempoolentry.Previously, we would error out if a previously retrieved
Txidwouldn'tbe available anymore at the second step. Here, we ensure smooth
continuation by simply skipping any entries we can't retrieve anymore.
Also we would retransmit entry and transaction data whenever
polling for mempool data. Here we introduce simple caches for both, so
most data is only retrieved in bulk on the first iteration after
startup.