347 lines
9.7 KiB
Nim
347 lines
9.7 KiB
Nim
## Nim-Codex
|
|
## Copyright (c) 2022 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.
|
|
|
|
# This module defines all operations on Manifest
|
|
|
|
import pkg/upraises
|
|
|
|
push: {.upraises: [].}
|
|
|
|
import pkg/libp2p/protobuf/minprotobuf
|
|
import pkg/libp2p/[cid, multihash, multicodec]
|
|
import pkg/questionable/results
|
|
|
|
import ../errors
|
|
import ../utils
|
|
import ../utils/json
|
|
import ../units
|
|
import ../blocktype
|
|
import ../indexingstrategy
|
|
import ../logutils
|
|
|
|
|
|
# TODO: Manifest should be reworked to more concrete types,
|
|
# perhaps using inheritance
|
|
type
|
|
Manifest* = object of RootObj
|
|
treeCid {.serialize.}: Cid # Root of the merkle tree
|
|
datasetSize {.serialize.}: NBytes # Total size of all blocks
|
|
blockSize {.serialize.}: NBytes # Size of each contained block (might not be needed if blocks are len-prefixed)
|
|
codec: MultiCodec # Dataset codec
|
|
hcodec: MultiCodec # Multihash codec
|
|
version: CidVersion # Cid version
|
|
case protected {.serialize.}: bool # Protected datasets have erasure coded info
|
|
of true:
|
|
ecK: int # Number of blocks to encode
|
|
ecM: int # Number of resulting parity blocks
|
|
originalTreeCid: Cid # The original root of the dataset being erasure coded
|
|
originalDatasetSize: NBytes
|
|
protectedStrategy: StrategyType # Indexing strategy used to build the slot roots
|
|
case verifiable {.serialize.}: bool # Verifiable datasets can be used to generate storage proofs
|
|
of true:
|
|
verifyRoot: Cid # Root of the top level merkle tree built from slot roots
|
|
slotRoots: seq[Cid] # Individual slot root built from the original dataset blocks
|
|
cellSize: NBytes # Size of each slot cell
|
|
verifiableStrategy: StrategyType # Indexing strategy used to build the slot roots
|
|
else:
|
|
discard
|
|
else:
|
|
discard
|
|
|
|
############################################################
|
|
# Accessors
|
|
############################################################
|
|
|
|
func blockSize*(self: Manifest): NBytes =
|
|
self.blockSize
|
|
|
|
func datasetSize*(self: Manifest): NBytes =
|
|
self.datasetSize
|
|
|
|
func version*(self: Manifest): CidVersion =
|
|
self.version
|
|
|
|
func hcodec*(self: Manifest): MultiCodec =
|
|
self.hcodec
|
|
|
|
func codec*(self: Manifest): MultiCodec =
|
|
self.codec
|
|
|
|
func protected*(self: Manifest): bool =
|
|
self.protected
|
|
|
|
func ecK*(self: Manifest): int =
|
|
self.ecK
|
|
|
|
func ecM*(self: Manifest): int =
|
|
self.ecM
|
|
|
|
func originalTreeCid*(self: Manifest): Cid =
|
|
self.originalTreeCid
|
|
|
|
func originalBlocksCount*(self: Manifest): int =
|
|
divUp(self.originalDatasetSize.int, self.blockSize.int)
|
|
|
|
func originalDatasetSize*(self: Manifest): NBytes =
|
|
self.originalDatasetSize
|
|
|
|
func treeCid*(self: Manifest): Cid =
|
|
self.treeCid
|
|
|
|
func blocksCount*(self: Manifest): int =
|
|
divUp(self.datasetSize.int, self.blockSize.int)
|
|
|
|
func verifiable*(self: Manifest): bool =
|
|
bool (self.protected and self.verifiable)
|
|
|
|
func verifyRoot*(self: Manifest): Cid =
|
|
self.verifyRoot
|
|
|
|
func slotRoots*(self: Manifest): seq[Cid] =
|
|
self.slotRoots
|
|
|
|
func numSlots*(self: Manifest): int =
|
|
self.ecK + self.ecM
|
|
|
|
func cellSize*(self: Manifest): NBytes =
|
|
self.cellSize
|
|
|
|
func protectedStrategy*(self: Manifest): StrategyType =
|
|
self.protectedStrategy
|
|
|
|
func verifiableStrategy*(self: Manifest): StrategyType =
|
|
self.verifiableStrategy
|
|
|
|
func numSlotBlocks*(self: Manifest): int =
|
|
divUp(self.blocksCount, self.numSlots)
|
|
|
|
############################################################
|
|
# Operations on block list
|
|
############################################################
|
|
|
|
func isManifest*(cid: Cid): ?!bool =
|
|
success (ManifestCodec == ? cid.contentType().mapFailure(CodexError))
|
|
|
|
func isManifest*(mc: MultiCodec): ?!bool =
|
|
success mc == ManifestCodec
|
|
|
|
############################################################
|
|
# Various sizes and verification
|
|
############################################################
|
|
|
|
func bytes*(self: Manifest, pad = true): NBytes =
|
|
## Compute how many bytes corresponding StoreStream(Manifest, pad) will return
|
|
if pad or self.protected:
|
|
self.blocksCount.NBytes * self.blockSize
|
|
else:
|
|
self.datasetSize
|
|
|
|
func rounded*(self: Manifest): int =
|
|
## Number of data blocks in *protected* manifest including padding at the end
|
|
roundUp(self.originalBlocksCount, self.ecK)
|
|
|
|
func steps*(self: Manifest): int =
|
|
## Number of EC groups in *protected* manifest
|
|
divUp(self.rounded, self.ecK)
|
|
|
|
func verify*(self: Manifest): ?!void =
|
|
## Check manifest correctness
|
|
##
|
|
|
|
if self.protected and (self.blocksCount != self.steps * (self.ecK + self.ecM)):
|
|
return failure newException(CodexError, "Broken manifest: wrong originalBlocksCount")
|
|
|
|
return success()
|
|
|
|
func cid*(self: Manifest): ?!Cid {.deprecated: "use treeCid instead".} =
|
|
self.treeCid.success
|
|
|
|
func `==`*(a, b: Manifest): bool =
|
|
(a.treeCid == b.treeCid) and
|
|
(a.datasetSize == b.datasetSize) and
|
|
(a.blockSize == b.blockSize) and
|
|
(a.version == b.version) and
|
|
(a.hcodec == b.hcodec) and
|
|
(a.codec == b.codec) and
|
|
(a.protected == b.protected) and
|
|
(if a.protected:
|
|
(a.ecK == b.ecK) and
|
|
(a.ecM == b.ecM) and
|
|
(a.originalTreeCid == b.originalTreeCid) and
|
|
(a.originalDatasetSize == b.originalDatasetSize) and
|
|
(a.protectedStrategy == b.protectedStrategy) and
|
|
(a.verifiable == b.verifiable) and
|
|
(if a.verifiable:
|
|
(a.verifyRoot == b.verifyRoot) and
|
|
(a.slotRoots == b.slotRoots) and
|
|
(a.cellSize == b.cellSize) and
|
|
(a.verifiableStrategy == b.verifiableStrategy)
|
|
else:
|
|
true)
|
|
else:
|
|
true)
|
|
|
|
func `$`*(self: Manifest): string =
|
|
"treeCid: " & $self.treeCid &
|
|
", datasetSize: " & $self.datasetSize &
|
|
", blockSize: " & $self.blockSize &
|
|
", version: " & $self.version &
|
|
", hcodec: " & $self.hcodec &
|
|
", codec: " & $self.codec &
|
|
", protected: " & $self.protected &
|
|
(if self.protected:
|
|
", ecK: " & $self.ecK &
|
|
", ecM: " & $self.ecM &
|
|
", originalTreeCid: " & $self.originalTreeCid &
|
|
", originalDatasetSize: " & $self.originalDatasetSize &
|
|
", verifiable: " & $self.verifiable &
|
|
(if self.verifiable:
|
|
", verifyRoot: " & $self.verifyRoot &
|
|
", slotRoots: " & $self.slotRoots
|
|
else:
|
|
"")
|
|
else:
|
|
"")
|
|
|
|
############################################################
|
|
# Constructors
|
|
############################################################
|
|
|
|
func new*(
|
|
T: type Manifest,
|
|
treeCid: Cid,
|
|
blockSize: NBytes,
|
|
datasetSize: NBytes,
|
|
version: CidVersion = CIDv1,
|
|
hcodec = Sha256HashCodec,
|
|
codec = BlockCodec,
|
|
protected = false): Manifest =
|
|
|
|
T(
|
|
treeCid: treeCid,
|
|
blockSize: blockSize,
|
|
datasetSize: datasetSize,
|
|
version: version,
|
|
codec: codec,
|
|
hcodec: hcodec,
|
|
protected: protected)
|
|
|
|
func new*(
|
|
T: type Manifest,
|
|
manifest: Manifest,
|
|
treeCid: Cid,
|
|
datasetSize: NBytes,
|
|
ecK, ecM: int,
|
|
strategy: StrategyType): Manifest =
|
|
## Create an erasure protected dataset from an
|
|
## unprotected one
|
|
##
|
|
|
|
Manifest(
|
|
treeCid: treeCid,
|
|
datasetSize: datasetSize,
|
|
version: manifest.version,
|
|
codec: manifest.codec,
|
|
hcodec: manifest.hcodec,
|
|
blockSize: manifest.blockSize,
|
|
protected: true,
|
|
ecK: ecK, ecM: ecM,
|
|
originalTreeCid: manifest.treeCid,
|
|
originalDatasetSize: manifest.datasetSize,
|
|
protectedStrategy: strategy)
|
|
|
|
func new*(
|
|
T: type Manifest,
|
|
manifest: Manifest): Manifest =
|
|
## Create an unprotected dataset from an
|
|
## erasure protected one
|
|
##
|
|
|
|
Manifest(
|
|
treeCid: manifest.originalTreeCid,
|
|
datasetSize: manifest.originalDatasetSize,
|
|
version: manifest.version,
|
|
codec: manifest.codec,
|
|
hcodec: manifest.hcodec,
|
|
blockSize: manifest.blockSize,
|
|
protected: false)
|
|
|
|
func new*(
|
|
T: type Manifest,
|
|
treeCid: Cid,
|
|
datasetSize: NBytes,
|
|
blockSize: NBytes,
|
|
version: CidVersion,
|
|
hcodec: MultiCodec,
|
|
codec: MultiCodec,
|
|
ecK: int,
|
|
ecM: int,
|
|
originalTreeCid: Cid,
|
|
originalDatasetSize: NBytes,
|
|
strategy: StrategyType): Manifest =
|
|
|
|
Manifest(
|
|
treeCid: treeCid,
|
|
datasetSize: datasetSize,
|
|
blockSize: blockSize,
|
|
version: version,
|
|
hcodec: hcodec,
|
|
codec: codec,
|
|
protected: true,
|
|
ecK: ecK,
|
|
ecM: ecM,
|
|
originalTreeCid: originalTreeCid,
|
|
originalDatasetSize: originalDatasetSize,
|
|
protectedStrategy: strategy)
|
|
|
|
func new*(
|
|
T: type Manifest,
|
|
manifest: Manifest,
|
|
verifyRoot: Cid,
|
|
slotRoots: openArray[Cid],
|
|
cellSize = DefaultCellSize,
|
|
strategy = SteppedStrategy): ?!Manifest =
|
|
## Create a verifiable dataset from an
|
|
## protected one
|
|
##
|
|
|
|
if not manifest.protected:
|
|
return failure newException(
|
|
CodexError, "Can create verifiable manifest only from protected manifest.")
|
|
|
|
if slotRoots.len != manifest.numSlots:
|
|
return failure newException(
|
|
CodexError, "Wrong number of slot roots.")
|
|
|
|
success Manifest(
|
|
treeCid: manifest.treeCid,
|
|
datasetSize: manifest.datasetSize,
|
|
version: manifest.version,
|
|
codec: manifest.codec,
|
|
hcodec: manifest.hcodec,
|
|
blockSize: manifest.blockSize,
|
|
protected: true,
|
|
ecK: manifest.ecK,
|
|
ecM: manifest.ecM,
|
|
originalTreeCid: manifest.treeCid,
|
|
originalDatasetSize: manifest.originalDatasetSize,
|
|
verifiable: true,
|
|
verifyRoot: verifyRoot,
|
|
slotRoots: @slotRoots,
|
|
cellSize: cellSize,
|
|
verifiableStrategy: strategy)
|
|
|
|
func new*(
|
|
T: type Manifest,
|
|
data: openArray[byte]): ?!Manifest =
|
|
## Create a manifest instance from given data
|
|
##
|
|
|
|
Manifest.decode(data)
|