347 lines
12 KiB
Nim
347 lines
12 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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## Snapshot Structure for 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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const
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# debugging, enable with: nim c -r -d:noisy:3 ...
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noisy {.intdefine.}: int = 0
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isMainOk {.used.} = noisy > 2
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import
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../../db/[storage_types, db_chain],
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../../utils/lru_cache,
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./clique_cfg,
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./clique_defs,
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./clique_poll,
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./ec_recover,
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algorithm,
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chronicles,
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eth/[common, rlp, trie/db],
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sequtils,
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strformat,
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strutils,
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tables,
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times
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type
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AddressHistory = Table[BlockNumber,EthAddress]
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SnapshotData* = object
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blockNumber: BlockNumber ## truncated block num where snapshot was created
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blockHash: Hash256 ## block hash where snapshot was created
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recents: AddressHistory ## recent signers for spam protections
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# clique/snapshot.go(58): Recents map[uint64]common.Address [..]
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ballot: CliquePoll ## Votes => authorised signers
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# clique/snapshot.go(50): type Snapshot struct [..]
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Snapshot* = object ## Snapshot is the state of the authorization voting at
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## a given point in time.
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cfg: CliqueCfg ## parameters to fine tune behavior
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data*: SnapshotData ## real snapshot
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{.push raises: [Defect,CatchableError].}
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logScope:
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topics = "clique PoA snapshot"
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# ------------------------------------------------------------------------------
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# Pretty printers for debugging
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# ------------------------------------------------------------------------------
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proc getPrettyPrinters(s: var Snapshot): var PrettyPrinters =
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## Mixin for pretty printers
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s.cfg.prettyPrint
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proc pp(s: var Snapshot; h: var AddressHistory): string =
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toSeq(h.keys)
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.mapIt(it.truncate(uint64))
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.sorted
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.mapIt("#" & $it & ":" & s.pp(h[it.u256]))
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.join(",")
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proc pp(s: var Snapshot; v: Vote): string =
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proc authorized(b: bool): string =
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if b: ",auhorized" else: ""
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"{" & &"signer={s.pp(v.signer)}" &
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&",address={s.pp(v.address)}" &
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&",blockNumber={v.blockNumber.truncate(uint64)}" &
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&"{authorized(v.authorize)}" & "}"
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proc pp(s: var Snapshot;
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v: (EthAddress,EthAddress,Vote); delim: string): string =
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&"(account={s.pp(v[0])}" &
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&"{delim}signer={s.pp(v[1])}" &
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&"{delim}vote={s.pp(v[2])})"
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proc pp(s: var Snapshot;
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w: seq[(EthAddress,EthAddress,Vote)]; sep1, sep2: string): string =
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w.mapIt(s.pp(it,sep1)).join(sep2)
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proc pp(s: var Snapshot;
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w: seq[(EthAddress,EthAddress,Vote)]; indent = 0): string =
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let
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sep1 = if 0 < indent: "\n" & ' '.repeat(indent) else: ","
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sep2 = if 0 < indent: "\n" & ' '.repeat(indent) else: " "
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s.pp(w,sep1,sep2)
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# ------------------------------------------------------------------------------
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# Public pretty printers
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# ------------------------------------------------------------------------------
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proc pp*(s: var Snapshot; delim: string): string =
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## Pretty print descriptor
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let
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sep1 = if 0 < delim.len: delim
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else: ";"
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sep2 = if 0 < delim.len and delim[0] == '\n': delim & ' '.repeat(8)
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else: ";"
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sep3 = if 0 < delim.len and delim[0] == '\n': delim & ' '.repeat(7)
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else: ";"
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&"(blockNumber=#{s.data.blockNumber}" &
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&"{sep1}recents=[{s.pp(s.data.recents)}]" &
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&"{sep1}votes=[" &
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s.pp(s.data.ballot.votesInternal,sep2,sep3) &
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"])"
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proc pp*(s: var Snapshot; indent = 0): string =
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## Pretty print descriptor
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let delim = if 0 < indent: "\n" & ' '.repeat(indent) else: " "
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s.pp(delim)
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# ------------------------------------------------------------------------------
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# Private functions needed to support RLP conversion
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# ------------------------------------------------------------------------------
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proc append[K,V](rw: var RlpWriter; tab: Table[K,V]) {.inline.} =
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rw.startList(tab.len)
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for key,value in tab.pairs:
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rw.append((key,value))
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proc read[K,V](rlp: var Rlp;
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Q: type Table[K,V]): Q {.inline, raises: [Defect,CatchableError].} =
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for w in rlp.items:
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let (key,value) = w.read((K,V))
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result[key] = value
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# ------------------------------------------------------------------------------
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# Public functions
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# ------------------------------------------------------------------------------
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# clique/snapshot.go(72): func newSnapshot(config [..]
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proc initSnapshot*(s: var Snapshot; cfg: CliqueCfg;
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number: BlockNumber; hash: Hash256; signers: openArray[EthAddress]) =
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## This creates a new snapshot with the specified startup parameters. The
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## method does not initialize the set of recent signers, so only ever use
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## if for the genesis block.
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s.cfg = cfg
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s.data.blockNumber = number
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s.data.blockHash = hash
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s.data.recents = initTable[BlockNumber,EthAddress]()
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s.data.ballot.initCliquePoll(signers)
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echo ">>> initSnapshot #", number.truncate(uint64),
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" >> ", s.pp(s.data.ballot.authSigners)
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proc initSnapshot*(cfg: CliqueCfg; number: BlockNumber; hash: Hash256;
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signers: openArray[EthAddress]): Snapshot =
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result.initSnapshot(cfg, number, hash, signers)
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proc blockNumber*(s: var Snapshot): BlockNumber =
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## Getter
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s.data.blockNumber
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# clique/snapshot.go(88): func loadSnapshot(config [..]
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proc loadSnapshot*(s: var Snapshot; cfg: CliqueCfg;
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hash: Hash256): CliqueResult {.gcsafe, raises: [Defect].} =
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## Load an existing snapshot from the database.
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try:
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let
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key = hash.cliqueSnapshotKey
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value = cfg.dbChain.db.get(key.toOpenArray)
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s.data = value.decode(SnapshotData)
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s.cfg = cfg
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except CatchableError as e:
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return err((errSnapshotLoad,e.msg))
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result = ok()
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# clique/snapshot.go(104): func (s *Snapshot) store(db [..]
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proc storeSnapshot*(s: var Snapshot): CliqueResult {.gcsafe,raises: [Defect].} =
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## Insert the snapshot into the database.
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try:
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let
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key = s.data.blockHash.cliqueSnapshotKey
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value = rlp.encode(s.data)
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s.cfg.dbChain.db.put(key.toOpenArray, value)
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except CatchableError as e:
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return err((errSnapshotStore,e.msg))
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result = ok()
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# clique/snapshot.go(185): func (s *Snapshot) apply(headers [..]
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proc applySnapshot*(s: var Snapshot;
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headers: openArray[BlockHeader]): CliqueResult =
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## Initialises an authorization snapshot `snap` by applying the `headers`
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## to the argument snapshot `s`.
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echo ">>> applySnapshot ", s.pp(headers).join("\n" & ' '.repeat(18))
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# Allow passing in no headers for cleaner code
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if headers.len == 0:
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return ok()
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# Sanity check that the headers can be applied
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if headers[0].blockNumber != s.data.blockNumber + 1:
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return err((errInvalidVotingChain,""))
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# clique/snapshot.go(191): for i := 0; i < len(headers)-1; i++ {
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for i in 0 ..< headers.len - 1:
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if headers[i+1].blockNumber != headers[i].blockNumber+1:
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return err((errInvalidVotingChain,""))
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# Iterate through the headers and create a new snapshot
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let
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start = getTime()
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logInterval = initDuration(seconds = 8)
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var
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logged = start
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# clique/snapshot.go(206): for i, header := range headers [..]
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for headersIndex in 0 ..< headers.len:
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echo ">>> applySnapshot headersIndex=", headersIndex
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let
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# headersIndex => also used for logging at the end of this loop
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header = headers[headersIndex]
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number = header.blockNumber
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echo "<<< applySnapshot 1"
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# Remove any votes on checkpoint blocks
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if (number mod s.cfg.epoch) == 0:
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s.data.ballot.initCliquePoll
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# Delete the oldest signer from the recent list to allow it signing again
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block:
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let limit = s.data.ballot.authSignersThreshold.u256
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if limit <= number:
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s.data.recents.del(number - limit)
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echo "<<< applySnapshot 2 snap=", s.pp(26)
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# Resolve the authorization key and check against signers
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let signer = ? s.cfg.signatures.getEcRecover(header)
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echo "<<< applySnapshot 3 ", s.pp(signer)
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if not s.data.ballot.isAuthSigner(signer):
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echo "<<< applySnapshot 3 => fail ", s.pp(29)
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return err((errUnauthorizedSigner,""))
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echo "<<< applySnapshot 4"
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for recent in s.data.recents.values:
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if recent == signer:
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return err((errRecentlySigned,""))
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s.data.recents[number] = signer
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echo "<<< applySnapshot 5"
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# Header authorized, discard any previous vote from the signer
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# clique/snapshot.go(233): for i, vote := range snap.Votes {
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s.data.ballot.delVote(signer = signer, address = header.coinbase)
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# Tally up the new vote from the signer
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# clique/snapshot.go(244): var authorize bool
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var authOk = false
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if header.nonce == NONCE_AUTH:
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authOk = true
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elif header.nonce != NONCE_DROP:
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return err((errInvalidVote,""))
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let vote = Vote(address: header.coinbase,
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signer: signer,
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blockNumber: number,
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authorize: authOk)
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echo "<<< applySnapshot calling addVote ", s.pp(vote)
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# clique/snapshot.go(253): if snap.cast(header.Coinbase, authorize) {
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s.data.ballot.addVote(vote)
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echo "<<< applySnapshot 6 ", s.pp(21)
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# clique/snapshot.go(269): if limit := uint64(len(snap.Signers)/2 [..]
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if s.data.ballot.authSignersShrunk:
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# Signer list shrunk, delete any leftover recent caches
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let limit = s.data.ballot.authSignersThreshold.u256
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if limit <= number:
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s.data.recents.del(number - limit)
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echo "<<< applySnapshot 7"
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# If we're taking too much time (ecrecover), notify the user once a while
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if logInterval < logged - getTime():
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info "Reconstructing voting history",
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processed = headersIndex,
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total = headers.len,
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elapsed = start - getTime()
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logged = getTime()
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let sinceStart = start - getTime()
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if logInterval < sinceStart:
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info "Reconstructed voting history",
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processed = headers.len,
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elapsed = sinceStart
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# clique/snapshot.go(303): snap.Number += uint64(len(headers))
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s.data.blockNumber += headers.len.u256
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s.data.blockHash = headers[^1].blockHash
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result = ok()
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proc validVote*(s: var Snapshot; address: EthAddress; authorize: bool): bool =
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## Returns `true` if voting makes sense, at all.
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s.data.ballot.validVote(address, authorize)
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proc recent*(s: var Snapshot; address: EthAddress): Result[BlockNumber,void] =
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## Return `BlockNumber` for `address` argument (if any)
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for (number,recent) in s.data.recents.pairs:
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if recent == address:
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return ok(number)
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return err()
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proc signersThreshold*(s: var Snapshot): int =
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## Forward to `CliquePoll`: Minimum number of authorised signers needed.
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s.data.ballot.authSignersThreshold
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proc isSigner*(s: var Snapshot; address: EthAddress): bool =
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## Checks whether argukment ``address` is in signers list
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s.data.ballot.isAuthSigner(address)
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proc signers*(s: var Snapshot): seq[EthAddress] =
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## Retrieves the sorted list of authorized signers
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s.data.ballot.authSigners
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# clique/snapshot.go(319): func (s *Snapshot) inturn(number [..]
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proc inTurn*(s: var Snapshot; number: BlockNumber, signer: EthAddress): bool =
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## Returns `true` if a signer at a given block height is in-turn or not.
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let ascSignersList = s.data.ballot.authSigners
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for offset in 0 ..< ascSignersList.len:
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if ascSignersList[offset] == signer:
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return (number mod ascSignersList.len.u256) == offset.u256
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# ------------------------------------------------------------------------------
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# End
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# ------------------------------------------------------------------------------
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