nimbus-eth1/nimbus/db/aristo/aristo_constants.nim

49 lines
1.5 KiB
Nim

# nimbus-eth1
# Copyright (c) 2023-2024 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.
{.push raises: [].}
import
std/sets,
./aristo_desc/desc_identifiers
const
EmptyBlob* = seq[byte].default
## Useful shortcut (borrowed from `sync/snap/constants.nim`)
EmptyVidSeq* = seq[VertexID].default
## Useful shortcut
EmptyVidSet* = EmptyVidSeq.toHashSet
## Useful shortcut
VOID_HASH_KEY* = HashKey()
## Void equivalent for Merkle hash value
VOID_PATH_ID* = PathID()
## Void equivalent for Merkle hash value
LEAST_FREE_VID* = 100
## Vids smaller are used as known state roots and cannot be recycled. Only
## the `VertexID(1)` state root is used by the `Aristo` methods. The other
## numbers smaller than `LEAST_FREE_VID` may be used by application
## functions with fixed assignments of the type of a state root (e.g. for
## a receipt or a transaction root.)
ACC_LRU_SIZE* = 1024 * 1024
## LRU cache size for accounts that have storage, see `.accLeaves` and
## `.stoLeaves` fields of the main descriptor.
static:
# must stay away from `VertexID(1)` and `VertexID(2)`
doAssert 2 < LEAST_FREE_VID
# End