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util: rewrite gIndex helper #679

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Dec 4, 2024
Merged

util: rewrite gIndex helper #679

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13 changes: 2 additions & 11 deletions packages/portalnetwork/src/networks/history/util.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -239,18 +239,9 @@ export const addRLPSerializedBlock = async (
await network.addBlockBody(sszBlock, header.hash(), header.serialize())
}

// Each EpochAccumulator is a merkle tree with 16384 leaves, and 16383 parent nodes.
// gIndex refers to index within the tree starting at the root
// So the gIndices of the leaf nodes start at 16384

export const blockNumberToGindex = (blockNumber: bigint): bigint => {
const randArray = new Array(8192).fill({
blockHash: hexToBytes('0xa66afd523336ddf6e71567e366c7ef98aa529644915c30a3802eac73c2c2f3a6'),
totalDifficulty: 1n,
})
const epochAcc = EpochAccumulator.value_toTree(randArray)
const listIndex = (Number(blockNumber) % 8192) * 2
const gIndex = EpochAccumulator.tree_getLeafGindices(1n, epochAcc)[listIndex]
const j = blockNumber % 8192n
const gIndex = 2n * j + 32768n
return gIndex
}

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