234 lines
7.6 KiB
Nim
234 lines
7.6 KiB
Nim
## Nim-Codex
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## Copyright (c) 2022 Status Research & Development GmbH
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## Licensed under either of
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## * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE))
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## * MIT license ([LICENSE-MIT](LICENSE-MIT))
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## at your option.
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## This file may not be copied, modified, or distributed except according to
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## those terms.
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# This module implements serialization and deserialization of Manifest
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import pkg/upraises
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push: {.upraises: [].}
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import std/tables
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import std/sequtils
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import pkg/libp2p
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import pkg/questionable
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import pkg/questionable/results
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import pkg/chronos
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import ./manifest
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import ../errors
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import ../blocktype
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import ../logutils
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import ../indexingstrategy
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proc encode*(manifest: Manifest): ?!seq[byte] =
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## Encode the manifest into a ``ManifestCodec``
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## multicodec container (Dag-pb) for now
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##
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? manifest.verify()
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var pbNode = initProtoBuffer()
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# NOTE: The `Data` field in the the `dag-pb`
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# contains the following protobuf `Message`
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#
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# ```protobuf
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# Message VerificationInfo {
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# bytes verifyRoot = 1; # Decimal encoded field-element
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# repeated bytes slotRoots = 2; # Decimal encoded field-elements
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# }
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# Message ErasureInfo {
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# optional uint32 ecK = 1; # number of encoded blocks
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# optional uint32 ecM = 2; # number of parity blocks
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# optional bytes originalTreeCid = 3; # cid of the original dataset
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# optional uint32 originalDatasetSize = 4; # size of the original dataset
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# optional VerificationInformation verification = 5; # verification information
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# }
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#
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# Message Header {
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# optional bytes treeCid = 1; # cid (root) of the tree
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# optional uint32 blockSize = 2; # size of a single block
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# optional uint64 datasetSize = 3; # size of the dataset
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# optional codec: MultiCodec = 4; # Dataset codec
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# optional hcodec: MultiCodec = 5 # Multihash codec
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# optional version: CidVersion = 6; # Cid version
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# optional ErasureInfo erasure = 7; # erasure coding info
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# }
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# ```
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#
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# var treeRootVBuf = initVBuffer()
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var header = initProtoBuffer()
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header.write(1, manifest.treeCid.data.buffer)
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header.write(2, manifest.blockSize.uint32)
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header.write(3, manifest.datasetSize.uint64)
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header.write(4, manifest.codec.uint32)
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header.write(5, manifest.hcodec.uint32)
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header.write(6, manifest.version.uint32)
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if manifest.protected:
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var erasureInfo = initProtoBuffer()
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erasureInfo.write(1, manifest.ecK.uint32)
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erasureInfo.write(2, manifest.ecM.uint32)
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erasureInfo.write(3, manifest.originalTreeCid.data.buffer)
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erasureInfo.write(4, manifest.originalDatasetSize.uint64)
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erasureInfo.write(5, manifest.protectedStrategy.uint32)
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if manifest.verifiable:
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var verificationInfo = initProtoBuffer()
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verificationInfo.write(1, manifest.verifyRoot.data.buffer)
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for slotRoot in manifest.slotRoots:
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verificationInfo.write(2, slotRoot.data.buffer)
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verificationInfo.write(3, manifest.cellSize.uint32)
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verificationInfo.write(4, manifest.verifiableStrategy.uint32)
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erasureInfo.write(6, verificationInfo)
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erasureInfo.finish()
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header.write(7, erasureInfo)
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pbNode.write(1, header) # set the treeCid as the data field
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pbNode.finish()
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return pbNode.buffer.success
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proc decode*(_: type Manifest, data: openArray[byte]): ?!Manifest =
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## Decode a manifest from a data blob
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##
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var
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pbNode = initProtoBuffer(data)
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pbHeader: ProtoBuffer
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pbErasureInfo: ProtoBuffer
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pbVerificationInfo: ProtoBuffer
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treeCidBuf: seq[byte]
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originalTreeCid: seq[byte]
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datasetSize: uint64
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codec: uint32
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hcodec: uint32
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version: uint32
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blockSize: uint32
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originalDatasetSize: uint64
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ecK, ecM: uint32
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protectedStrategy: uint32
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verifyRoot: seq[byte]
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slotRoots: seq[seq[byte]]
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cellSize: uint32
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verifiableStrategy: uint32
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# Decode `Header` message
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if pbNode.getField(1, pbHeader).isErr:
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return failure("Unable to decode `Header` from dag-pb manifest!")
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# Decode `Header` contents
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if pbHeader.getField(1, treeCidBuf).isErr:
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return failure("Unable to decode `treeCid` from manifest!")
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if pbHeader.getField(2, blockSize).isErr:
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return failure("Unable to decode `blockSize` from manifest!")
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if pbHeader.getField(3, datasetSize).isErr:
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return failure("Unable to decode `datasetSize` from manifest!")
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if pbHeader.getField(4, codec).isErr:
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return failure("Unable to decode `codec` from manifest!")
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if pbHeader.getField(5, hcodec).isErr:
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return failure("Unable to decode `hcodec` from manifest!")
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if pbHeader.getField(6, version).isErr:
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return failure("Unable to decode `version` from manifest!")
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if pbHeader.getField(7, pbErasureInfo).isErr:
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return failure("Unable to decode `erasureInfo` from manifest!")
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let protected = pbErasureInfo.buffer.len > 0
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var verifiable = false
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if protected:
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if pbErasureInfo.getField(1, ecK).isErr:
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return failure("Unable to decode `K` from manifest!")
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if pbErasureInfo.getField(2, ecM).isErr:
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return failure("Unable to decode `M` from manifest!")
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if pbErasureInfo.getField(3, originalTreeCid).isErr:
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return failure("Unable to decode `originalTreeCid` from manifest!")
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if pbErasureInfo.getField(4, originalDatasetSize).isErr:
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return failure("Unable to decode `originalDatasetSize` from manifest!")
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if pbErasureInfo.getField(5, protectedStrategy).isErr:
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return failure("Unable to decode `protectedStrategy` from manifest!")
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if pbErasureInfo.getField(6, pbVerificationInfo).isErr:
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return failure("Unable to decode `verificationInfo` from manifest!")
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verifiable = pbVerificationInfo.buffer.len > 0
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if verifiable:
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if pbVerificationInfo.getField(1, verifyRoot).isErr:
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return failure("Unable to decode `verifyRoot` from manifest!")
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if pbVerificationInfo.getRequiredRepeatedField(2, slotRoots).isErr:
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return failure("Unable to decode `slotRoots` from manifest!")
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if pbVerificationInfo.getField(3, cellSize).isErr:
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return failure("Unable to decode `cellSize` from manifest!")
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if pbVerificationInfo.getField(4, verifiableStrategy).isErr:
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return failure("Unable to decode `verifiableStrategy` from manifest!")
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let
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treeCid = ? Cid.init(treeCidBuf).mapFailure
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let
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self = if protected:
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Manifest.new(
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treeCid = treeCid,
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datasetSize = datasetSize.NBytes,
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blockSize = blockSize.NBytes,
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version = CidVersion(version),
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hcodec = hcodec.MultiCodec,
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codec = codec.MultiCodec,
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ecK = ecK.int,
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ecM = ecM.int,
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originalTreeCid = ? Cid.init(originalTreeCid).mapFailure,
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originalDatasetSize = originalDatasetSize.NBytes,
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strategy = StrategyType(protectedStrategy))
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else:
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Manifest.new(
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treeCid = treeCid,
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datasetSize = datasetSize.NBytes,
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blockSize = blockSize.NBytes,
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version = CidVersion(version),
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hcodec = hcodec.MultiCodec,
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codec = codec.MultiCodec)
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? self.verify()
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if verifiable:
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let
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verifyRootCid = ? Cid.init(verifyRoot).mapFailure
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slotRootCids = slotRoots.mapIt(? Cid.init(it).mapFailure)
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return Manifest.new(
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manifest = self,
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verifyRoot = verifyRootCid,
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slotRoots = slotRootCids,
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cellSize = cellSize.NBytes,
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strategy = StrategyType(verifiableStrategy)
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)
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self.success
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func decode*(_: type Manifest, blk: Block): ?!Manifest =
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## Decode a manifest using `decoder`
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##
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if not ? blk.cid.isManifest:
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return failure "Cid not a manifest codec"
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Manifest.decode(blk.data)
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