nimbus-eth1/tests/test_sync_snap/test_calc.nim

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# Nimbus - Types, data structures and shared utilities used in network sync
#
# Copyright (c) 2018-2021 Status Research & Development GmbH
# Licensed under either of
# * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or
# http://www.apache.org/licenses/LICENSE-2.0)
# * MIT license ([LICENSE-MIT](LICENSE-MIT) or
# http://opensource.org/licenses/MIT)
# at your option. This file may not be copied, modified, or
# distributed except according to those terms.
## Snap sync components tester and TDD environment
import
std/[random, sequtils],
eth/common,
stew/byteutils,
unittest2,
../../nimbus/sync/[handlers, protocol],
../../nimbus/sync/snap/range_desc,
../../nimbus/sync/snap/worker/db/[hexary_desc, hexary_range],
./test_helpers
const
accObjRlpMin = 70 # min size of an encoded `Account()` obj
accObjRlpMax = 110 # max size of an encoded `Account()` obj
var
accBlobs: array[accObjRlpMax - accObjRlpMin + 1, Blob]
brNode = XNodeObj(kind: Branch)
nodeBlob: Blob
# ------------------------------------------------------------------------------
# Private helpers for `test_calcAccountsListSizes()`
# ------------------------------------------------------------------------------
proc randAccSize(r: var Rand): int =
## Print random account size
accObjRlpMin + r.rand(accBlobs.len - 1)
proc accBlob(n: int): Blob =
let inx = n - accObjRlpMin
if 0 <= inx and inx < accBlobs.len:
accBlobs[inx]
else:
@[]
proc initAccBlobs() =
if accBlobs[0].len == 0:
let ffAccLen = Account(
storageRoot: Hash256(data: high(UInt256).toBytesBE),
codeHash: Hash256(data: high(UInt256).toBytesBE),
nonce: high(uint64),
balance: high(UInt256)).encode.len
check accObjRlpMin == Account().encode.len
check accObjRlpMax == ffAccLen
# Initialise
for n in 0 ..< accBlobs.len:
accBlobs[n] = 5.byte.repeat(accObjRlpMin + n)
# Verify
for n in 0 .. (accObjRlpMax + 2):
if accObjRlpMin <= n and n <= accObjRlpMax:
check n == accBlob(n).len
else:
check 0 == accBlob(n).len
proc accRndChain(r: var Rand; nItems: int): seq[RangeLeaf] =
for n in 0 ..< nItems:
result.add RangeLeaf(data: accBlob(r.randAccSize()))
discard result[^1].key.init (n mod 256).byte.repeat(32)
proc accRndChain(seed: int; nItems: int): seq[RangeLeaf] =
var prng = initRand(seed)
prng.accRndChain(nItems)
# ------------------------------------------------------------------------------
# Private helpers for `test_calcProofsListSizes()`
# ------------------------------------------------------------------------------
proc initBranchNodeSample() =
if nodeBlob.len == 0:
for n in 0 .. 15:
brNode.bLink[n] = high(NodeTag).to(Blob)
nodeBlob = brNode.convertTo(Blob)
# ------------------------------------------------------------------------------
# Public test function
# ------------------------------------------------------------------------------
proc test_calcAccountsListSizes*() =
## Verify accounts size calculation for `hexaryRangeLeafsProof()`.
initAccBlobs()
let chain = 42.accRndChain(123)
# Emulate `hexaryRangeLeafsProof()` size calculations
var sizeAccu = 0
for n in 0 ..< chain.len:
let (pairLen,listLen) =
chain[n].data.len.hexaryRangeRlpLeafListSize(sizeAccu)
check listLen == chain[0 .. n].encode.len
sizeAccu += pairLen
proc test_calcProofsListSizes*() =
## RLP does not allow static check ..
initBranchNodeSample()
for n in [0, 1, 2, 126, 127]:
let
nodeSample = nodeBlob.to(SnapProof).repeat(n)
nodeBlobsEncoded = nodeSample.proofEncode
nodeBlobsDecoded = nodeBlobsEncoded.proofDecode
nodeBlobsHex = nodeBlobsEncoded.toHex
brNodesHex = brNode.repeat(n).convertTo(Blob).toHex
#echo "+++ ", n, " ", nodeBlobsEncoded.rlpFromBytes.inspect
#echo ">>> ", n, " ", nodeBlobsHex
#echo "<<< ", n, " ", brNodesHex
check nodeBlobsEncoded.len == n.hexaryRangeRlpNodesListSizeMax
check nodeBlobsDecoded == nodeSample
check nodeBlobsHex == brNodesHex
# ------------------------------------------------------------------------------
# End
# ------------------------------------------------------------------------------