101 lines
3.5 KiB
Nim
101 lines
3.5 KiB
Nim
# Nimbus
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# Copyright (c) 2018 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 distributed except
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# according to those terms.
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##
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## EIP-225 Clique PoA Consensus Protocol
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## =====================================
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##
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## For details see
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## `EIP-225 <https://github.com/ethereum/EIPs/blob/master/EIPS/eip-225.md>`_
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## and
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## `go-ethereum <https://github.com/ethereum/EIPs/blob/master/EIPS/eip-225.md>`_
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##
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import
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std/[times],
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./clique/[clique_cfg, clique_defs, clique_desc],
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./clique/snapshot/[ballot, snapshot_desc],
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stew/results
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{.push raises: [].}
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# Note that mining is unsupported. Unused code ported from the Go
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# implementation is stashed into the `clique_unused` module.
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export
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clique_cfg,
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clique_defs,
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clique_desc.Clique
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type
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CliqueState* = ##\
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## Descriptor state snapshot which can be used for implementing
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## transaction trasnaction handling. Nore the the `Snapshot` type
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## inside the `Result[]` is most probably opaque.
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Result[Snapshot,void]
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# ------------------------------------------------------------------------------
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# Public
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# ------------------------------------------------------------------------------
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proc newClique*(db: CoreDbRef, cliquePeriod, cliqueEpoch: int): Clique =
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## Constructor for a new Clique proof-of-authority consensus engine. The
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## initial state of the engine is `empty`, there are no authorised signers.
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##
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## If chain_config provides `Period` or `Epoch`, then `Period` or `Epoch`
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## will be taken from chain_config. Otherwise, default value in `newCliqueCfg`
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## will be used
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let cfg = db.newCliqueCfg
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if cliquePeriod > 0:
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cfg.period = initDuration(seconds = cliquePeriod)
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if cliqueEpoch > 0:
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cfg.epoch = cliqueEpoch
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cfg.newClique
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proc cliqueSave*(c: Clique): CliqueState =
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## Save current `Clique` state. This state snapshot saves the internal
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## data that make up the list of authorised signers (see `cliqueSigners()`
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## below.)
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ok(c.snapshot)
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proc cliqueRestore*(c: Clique; state: var CliqueState) =
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## Restore current `Clique` state from a saved snapshot.
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##
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## For the particular `state` argument this fuction is disabled with
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## `cliqueDispose()`. So it can be savely wrapped in a `defer:` statement.
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## In transaction lingo, this would then be the rollback function.
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if state.isOk:
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c.snapshot = state.value
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proc cliqueDispose*(c: Clique; state: var CliqueState) =
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## Disable the function `cliqueDispose()` for the particular `state`
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## argument.
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##
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## In transaction lingo, this would be the commit function if
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## `cliqueRestore()` was wrapped in a `defer:` statement.
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state = err(CliqueState)
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proc cliqueSigners*(c: Clique): seq[EthAddress] =
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## Retrieve the sorted list of authorized signers for the current state
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## of the `Clique` descriptor.
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##
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## Note that the return argument list is sorted on-the-fly each time this
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## function is invoked.
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c.snapshot.ballot.authSigners
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proc cliqueSignersLen*(c: Clique): int =
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## Get the number of authorized signers for the current state of the
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## `Clique` descriptor. The result is equivalent to `c.cliqueSigners.len`.
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c.snapshot.ballot.authSignersLen
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# ------------------------------------------------------------------------------
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# End
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# ------------------------------------------------------------------------------
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