nim-codex/codex/manifest/manifest.nim

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2022-05-19 19:56:03 +00:00
## 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.
import pkg/upraises
push: {.upraises: [].}
import pkg/libp2p/protobuf/minprotobuf
import pkg/libp2p
import pkg/questionable
import pkg/questionable/results
import pkg/chronicles
import ../errors
import ../blocktype
import ./types
import ./coders
func len*(self: Manifest): int =
self.blocks.len
func size*(self: Manifest): int =
self.blocks.len * self.blockSize
func `[]`*(self: Manifest, i: Natural): Cid =
self.blocks[i]
func `[]=`*(self: var Manifest, i: Natural, item: Cid) =
self.rootHash = Cid.none
self.blocks[i] = item
func `[]`*(self: Manifest, i: BackwardsIndex): Cid =
self.blocks[self.len - i.int]
func `[]=`*(self: Manifest, i: BackwardsIndex, item: Cid) =
self.rootHash = Cid.none
self.blocks[self.len - i.int] = item
proc add*(self: Manifest, cid: Cid) =
self.rootHash = Cid.none
trace "Adding cid to manifest", cid
self.blocks.add(cid)
iterator items*(self: Manifest): Cid =
for b in self.blocks:
yield b
iterator pairs*(self: Manifest): tuple[key: int, val: Cid] =
for pair in self.blocks.pairs():
yield pair
func contains*(self: Manifest, cid: Cid): bool =
cid in self.blocks
template hashBytes(mh: MultiHash): seq[byte] =
## get the hash bytes of a multihash object
##
mh.data.buffer[mh.dpos..(mh.dpos + mh.size - 1)]
proc makeRoot*(self: Manifest): ?!void =
## Create a tree hash root of the contained
## block hashes
##
var
stack: seq[MultiHash]
for cid in self:
stack.add(? cid.mhash.mapFailure)
while stack.len > 1:
let
(b1, b2) = (stack.pop(), stack.pop())
mh = ? MultiHash.digest(
$self.hcodec,
(b1.hashBytes() & b2.hashBytes()))
.mapFailure
stack.add(mh)
if stack.len == 1:
let cid = ? Cid.init(
self.version,
self.codec,
(? EmptyDigests[self.version][self.hcodec].catch))
.mapFailure
self.rootHash = cid.some
success()
func rounded*(self: Manifest): int =
if (self.originalLen mod self.K) != 0:
return self.originalLen + (self.K - (self.originalLen mod self.K))
self.originalLen
func steps*(self: Manifest): int =
self.rounded div self.K # number of blocks per row
proc cid*(self: Manifest): ?!Cid =
## Generate a root hash using the treehash algorithm
##
if self.rootHash.isNone:
? self.makeRoot()
(!self.rootHash).success
proc new*(
T: type Manifest,
blocks: openArray[Cid] = [],
protected = false,
version = CIDv1,
hcodec = multiCodec("sha2-256"),
codec = multiCodec("raw"),
blockSize = BlockSize): ?!T =
## Create a manifest using array of `Cid`s
##
if hcodec notin EmptyDigests[version]:
return failure("Unsupported manifest hash codec!")
T(
blocks: @blocks,
version: version,
codec: codec,
hcodec: hcodec,
blockSize: blockSize,
protected: protected).success
proc new*(
T: type Manifest,
manifest: Manifest,
K, M: int): ?!Manifest =
## Create an erasure protected dataset from an
## un-protected one
##
var
self = Manifest(
version: manifest.version,
codec: manifest.codec,
hcodec: manifest.hcodec,
blockSize: manifest.blockSize,
protected: true,
K: K, M: M,
originalCid: ? manifest.cid,
originalLen: manifest.len)
let
encodedLen = self.rounded + (self.steps * M)
self.blocks = newSeq[Cid](encodedLen)
# copy original manifest blocks
for i in 0..<self.rounded:
if i < manifest.len:
self.blocks[i] = manifest[i]
else:
self.blocks[i] = EmptyCid[manifest.version]
.catch
.get()[manifest.hcodec]
.catch
.get()
self.success
proc new*(
T: type Manifest,
data: openArray[byte],
decoder = ManifestContainers[$DagPBCodec]): ?!T =
Manifest.decode(data, decoder)