122 lines
3.9 KiB
Nim
122 lines
3.9 KiB
Nim
# Nimbus
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# Copyright (c) 2018-2021 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) or
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# http://www.apache.org/licenses/LICENSE-2.0)
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# * MIT license ([LICENSE-MIT](LICENSE-MIT) or
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# http://opensource.org/licenses/MIT)
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# at your option. This file may not be copied, modified, or
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# distributed except according to those terms.
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import
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std/[math, hashes],
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eth/common/eth_types_rlp,
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stew/byteutils
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{.push raises: [Defect].}
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type
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BlockHash* = distinct Hash256
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## Hash of a block, goes with `BlockNumber`.
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##
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## Note that the `ethXX` protocol driver always uses the
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## underlying `Hash256` type which needs to be converted to `BlockHash`.
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BlocksRequest* = object
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startBlock*: HashOrNum
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maxResults*, skip*: uint
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reverse*: bool
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# ------------------------------------------------------------------------------
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# Public constructors
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# ------------------------------------------------------------------------------
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proc new*(T: type BlockHash): T =
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Hash256().T
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# ------------------------------------------------------------------------------
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# Public (probably non-trivial) type conversions
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# ------------------------------------------------------------------------------
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proc to*(num: SomeInteger; T: type float): T =
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## Convert to float. Result an d argument are not strictly equivalent. Though
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## sort of `(num.to(float) + 0.5).int == num` might hold in many cases.
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num.T
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proc to*(longNum: UInt256; T: type float): T =
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## Convert to float (see also comment at `num.to(float)`, above.)
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let mantissaLen = 256 - longNum.leadingZeros
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if mantissaLen <= 64:
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longNum.truncate(uint64).T
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else:
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let exp = mantissaLen - 64
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(longNum shr exp).truncate(uint64).T * (2.0 ^ exp)
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proc to*(w: BlockHash; T: type Hash256): T =
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## Syntactic sugar
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w.Hash256
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proc to*(w: seq[BlockHash]; T: type seq[Hash256]): T =
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## Ditto
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cast[seq[Hash256]](w)
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proc to*(bh: BlockHash; T: type HashOrNum): T =
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## Convert argument blocj hash `bh` to `HashOrNum`
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T(isHash: true, hash: bh.Hash256)
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# ------------------------------------------------------------------------------
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# Public functions
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# ------------------------------------------------------------------------------
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proc read*(rlp: var Rlp, T: type BlockHash): T
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{.gcsafe, raises: [Defect,RlpError]} =
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## RLP mixin reader
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rlp.read(Hash256).T
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proc append*(writer: var RlpWriter; h: BlockHash) =
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## RLP mixin
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append(writer, h.Hash256)
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proc `==`*(a: BlockHash; b: Hash256): bool =
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a.Hash256 == b
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proc `==`*[T: BlockHash](a,b: T): bool =
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a.Hash256 == b.Hash256
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proc hash*(root: BlockHash): Hash =
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## Mixin for `Table` or `KeyedQueue`
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root.Hash256.data.hash
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# ------------------------------------------------------------------------------
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# Public printing and pretty printing
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# ------------------------------------------------------------------------------
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func toHex*(hash: Hash256): string =
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## Shortcut for `byteutils.toHex(hash.data)`
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hash.data.toHex
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func `$`*(h: BlockHash): string =
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$h.Hash256.data.toHex
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func `$`*(blob: Blob): string =
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blob.toHex
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func `$`*(hashOrNum: HashOrNum): string =
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# It's always obvious which one from the visible length of the string.
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if hashOrNum.isHash: $hashOrNum.hash
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else: $hashOrNum.number
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# ------------------------------------------------------------------------------
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# Public debug printing helpers
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# ------------------------------------------------------------------------------
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func traceStep*(request: BlocksRequest): string =
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var str = if request.reverse: "-" else: "+"
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if request.skip < high(typeof(request.skip)):
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return str & $(request.skip + 1)
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return static($(high(typeof(request.skip)).u256 + 1))
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# ------------------------------------------------------------------------------
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# End
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# ------------------------------------------------------------------------------
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