nimbus-eth1/fluffy/database/era1_db.nim

67 lines
2.2 KiB
Nim

# fluffy
# Copyright (c) 2024 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.
{.push raises: [].}
import std/os, stew/io2, results, ../network/history/accumulator, ../eth_data/era1
type Era1DB* = ref object
## The Era1 database manages a collection of era files that together make up
## a linear history of pre-merge execution chain data.
path: string
network: string
accumulator: FinishedAccumulator
files: seq[Era1File]
proc getEra1File(db: Era1DB, era: Era1): Result[Era1File, string] =
for f in db.files:
if f.blockIdx.startNumber.era == era:
return ok(f)
if era > mergeBlockNumber.era():
return err("Selected era1 past pre-merge data")
let
root = db.accumulator.historicalEpochs[era.int]
name = era1FileName(db.network, era, Digest(data: root))
path = db.path / name
if not isFile(path):
return err("No such era file")
# TODO: The open call does not do full verification. It is assumed here that
# trusted files are used. We might want to add a full validation option.
let f = Era1File.open(path).valueOr:
return err(error)
if db.files.len > 16: # TODO LRU
close(db.files[0])
db.files.delete(0)
db.files.add(f)
ok(f)
proc new*(
T: type Era1DB, path: string, network: string, accumulator: FinishedAccumulator
): Era1DB =
Era1DB(path: path, network: network, accumulator: accumulator)
proc getBlockTuple*(db: Era1DB, blockNumber: uint64): Result[BlockTuple, string] =
let f = ?db.getEra1File(blockNumber.era)
f.getBlockTuple(blockNumber)
proc getAccumulator*(
db: Era1DB, blockNumber: uint64
): Result[EpochAccumulatorCached, string] =
## Get the Epoch Accumulator that the block with `blockNumber` is part of.
# TODO: Probably want this `EpochAccumulatorCached` also actually cached in
# the Era1File or EraDB object.
let f = ?db.getEra1File(blockNumber.era)
f.buildAccumulator()