56 lines
1.3 KiB
Nim
56 lines
1.3 KiB
Nim
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## Nim-Dagger
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## Copyright (c) 2021 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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import pkg/libp2p/multihash
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import pkg/libp2p/multicodec
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import pkg/libp2p/cid
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import pkg/stew/byteutils
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export cid, multihash, multicodec
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type
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CidDontMatchError* = object of CatchableError
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Block* = object of RootObj
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cid*: Cid
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data*: seq[byte]
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proc `$`*(b: Block): string =
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result &= "cid: " & $b.cid
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result &= "\ndata: " & string.fromBytes(b.data)
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proc new*(
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T: type Block,
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cid: Cid,
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data: openArray[byte] = [],
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verify: bool = false): T =
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let b = Block.new(
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data,
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cid.cidver,
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cid.mhash.get().mcodec,
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cid.mcodec
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)
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if verify and cid != b.cid:
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raise newException(CidDontMatchError,
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"The suplied Cid doesn't match the data!")
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return b
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proc new*(
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T: type Block,
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data: openArray[byte] = [],
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version = CIDv0,
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hcodec = multiCodec("sha2-256"),
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codec = multiCodec("dag-pb")): T =
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let hash = MultiHash.digest($hcodec, data).get()
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Block(
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cid: Cid.init(version, codec, hash).get(),
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data: @data)
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