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https://github.com/logos-storage/nim-nitro.git
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35 lines
942 B
Nim
35 lines
942 B
Nim
import std/tables
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import std/sets
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import std/hashes
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import ../basics
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push: {.upraises: [].}
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type
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Nonces* = object
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next: Table[NonceKey, UInt48]
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NonceKey = object
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chainId: UInt256
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participants: HashSet[EthAddress]
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func hash(key: NonceKey): Hash =
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var h: Hash
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h = h !& key.chainId.hash
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h = h !& key.participants.hash
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!$h
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func key(chainId: UInt256, participants: openArray[EthAddress]): NonceKey =
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NonceKey(chainId: chainId, participants: participants.toHashSet)
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func getNonce*(nonces: var Nonces,
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chainId: UInt256,
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participants: varargs[EthAddress]): UInt48 =
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nonces.next.?[key(chainId, participants)] |? 0
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func incNonce*(nonces: var Nonces,
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oldNonce: UInt48,
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chainId: UInt256,
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participants: varargs[EthAddress]) =
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let next = max(oldNonce, nonces.getNonce(chainId, participants)) + 1
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nonces.next[key(chainId, participants)] = next
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