nimbus-eth1/fluffy/tests/test_accumulator.nim

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# Nimbus
# Copyright (c) 2022 Status Research & Development GmbH
# Licensed and distributed under either of
# * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
# * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
# at your option. This file may not be copied, modified, or distributed except according to those terms.
{.used.}
{.push raises: [Defect].}
import
unittest2, stint, stew/byteutils,
eth/common/eth_types,
../populate_db,
../network/history/[accumulator, accumulator_db]
suite "Header Accumulator":
test "Header Accumulator Update":
const
hashTreeRoots = [
"b629833240bb2f5eabfb5245be63d730ca4ed30d6a418340ca476e7c1f1d98c0",
"00cbebed829e1babb93f2300bebe7905a98cb86993c7fc09bb5b04626fd91ae5",
"88cce8439ebc0c1d007177ffb6831c15c07b4361984cc52235b6fd728434f0c7"]
dataFile = "./fluffy/tests/blocks/mainnet_blocks_1-2.json"
let blockDataRes = readJsonType(dataFile, BlockDataTable)
check blockDataRes.isOk()
let blockData = blockDataRes.get()
var headers: seq[BlockHeader]
# Len of headers from blockdata + genesis header
headers.setLen(blockData.len() + 1)
headers[0] = getGenesisHeader()
for k, v in blockData.pairs:
let res = v.readBlockHeader()
check res.isOk()
let header = res.get()
headers[header.blockNumber.truncate(int)] = header
var accumulator: Accumulator
for i, hash in hashTreeRoots:
updateAccumulator(accumulator, headers[i])
check accumulator.hash_tree_root().data.toHex() == hashTreeRoots[i]
test "Header Accumulator Proofs":
const
# Amount of headers to be created and added to the accumulator
amount = 25000
# Headers to test verification for
headersToTest = [
0,
epochSize - 1,
epochSize,
epochSize*2 - 1,
epochSize*2,
epochSize*3 - 1,
epochSize*3,
epochSize*3 + 1,
amount - 1]
var headers: seq[BlockHeader]
for i in 0..<amount:
# Note: These test headers will not be a blockchain, as the parent hashes
# are not properly filled in. That's fine however for this test, as that
# is not the way the headers are verified with the accumulator.
headers.add(BlockHeader(
blockNumber: i.stuint(256), difficulty: 1.stuint(256)))
let db = AccumulatorDB.new("", inMemory = true)
db.buildAccumulator(headers)
let accumulatorOpt = db.getAccumulator()
check accumulatorOpt.isSome()
let accumulator = accumulatorOpt.get()
block: # Test valid headers
for i in headersToTest:
let header = headers[i]
let proofOpt =
if header.inCurrentEpoch(accumulator):
none(seq[Digest])
else:
let proof = db.buildProof(header)
check proof.isOk()
some(proof.get())
check db.verifyHeader(header, proofOpt).isOk()
block: # Test some invalid headers
# Test a header with block number > than latest in accumulator
let header = BlockHeader(blockNumber: 25000.stuint(256))
check db.verifyHeader(header, none(seq[Digest])).isErr()
# Test different block headers by altering the difficulty
for i in headersToTest:
let header = BlockHeader(
blockNumber: i.stuint(256), difficulty: 2.stuint(256))
check db.verifyHeader(header, none(seq[Digest])).isErr()