nim-codex/codex/codextypes.nim

107 lines
2.8 KiB
Nim

## Nim-Codex
## Copyright (c) 2023 Status Research & Development GmbH
## Licensed under either of
## * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE))
## * MIT license ([LICENSE-MIT](LICENSE-MIT))
## at your option.
## This file may not be copied, modified, or distributed except according to
## those terms.
{.push raises: [].}
import std/tables
import std/sugar
import pkg/libp2p/multicodec
import pkg/libp2p/multihash
import pkg/libp2p/cid
import pkg/results
import pkg/questionable/results
import ./units
import ./errors
export tables
const
# Size of blocks for storage / network exchange,
DefaultBlockSize* = NBytes 1024*64
DefaultCellSize* = NBytes 2048
# hashes
Sha256HashCodec* = multiCodec("sha2-256")
Sha512HashCodec* = multiCodec("sha2-512")
Pos2Bn128SpngCodec* = multiCodec("poseidon2-alt_bn_128-sponge-r2")
Pos2Bn128MrklCodec* = multiCodec("poseidon2-alt_bn_128-merkle-2kb")
ManifestCodec* = multiCodec("codex-manifest")
DatasetRootCodec* = multiCodec("codex-root")
BlockCodec* = multiCodec("codex-block")
SlotRootCodec* = multiCodec("codex-slot-root")
SlotProvingRootCodec* = multiCodec("codex-proving-root")
CodexSlotCellCodec* = multiCodec("codex-slot-cell")
CodexHashesCodecs* = [
Sha256HashCodec,
Pos2Bn128SpngCodec,
Pos2Bn128MrklCodec
]
CodexPrimitivesCodecs* = [
ManifestCodec,
DatasetRootCodec,
BlockCodec,
SlotRootCodec,
SlotProvingRootCodec,
CodexSlotCellCodec,
]
proc initEmptyCidTable(): ?!Table[(CidVersion, MultiCodec, MultiCodec), Cid] =
## Initialize padding blocks table
##
## TODO: Ideally this is done at compile time, but for now
## we do it at runtime because of an `importc` error that is
## coming from somewhere in MultiHash that I can't track down.
##
let
emptyData: seq[byte] = @[]
PadHashes = {
Sha256HashCodec: ? MultiHash.digest($Sha256HashCodec, emptyData).mapFailure,
Sha512HashCodec: ? MultiHash.digest($Sha512HashCodec, emptyData).mapFailure,
}.toTable
var
table = initTable[(CidVersion, MultiCodec, MultiCodec), Cid]()
for hcodec, mhash in PadHashes.pairs:
table[(CIDv1, hcodec, BlockCodec)] = ? Cid.init(CIDv1, BlockCodec, mhash).mapFailure
success table
proc emptyCid*(
version: CidVersion,
hcodec: MultiCodec,
dcodec: MultiCodec): ?!Cid =
## Returns cid representing empty content,
## given cid version, hash codec and data codec
##
var
table {.global, threadvar.}: Table[(CidVersion, MultiCodec, MultiCodec), Cid]
once:
table = ? initEmptyCidTable()
table[(version, hcodec, dcodec)].catch
proc emptyDigest*(
version: CidVersion,
hcodec: MultiCodec,
dcodec: MultiCodec): ?!MultiHash =
## Returns hash representing empty content,
## given cid version, hash codec and data codec
##
emptyCid(version, hcodec, dcodec)
.flatMap((cid: Cid) => cid.mhash.mapFailure)