# Nimbus # Copyright (c) 2018-2019 Status Research & Development GmbH # Licensed under either of # * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or # http://www.apache.org/licenses/LICENSE-2.0) # * MIT license ([LICENSE-MIT](LICENSE-MIT) or # http://opensource.org/licenses/MIT) # at your option. This file may not be copied, modified, or distributed except # according to those terms. import std/[algorithm, sequtils, strformat, strutils, tables], eth/keys, ethash, secp256k1/abi, stew/objects, ../../nimbus/core/[chain, clique], # must be early (compilation annoyance) ../../nimbus/common/common, ../../nimbus/core/clique/[clique_desc, clique_genvote, clique_helpers, clique_snapshot], ../../nimbus/core/clique/snapshot/[ballot, snapshot_desc], ../../nimbus/[config, constants], ./voter_samples as vs export vs, snapshot_desc const prngSeed = 42 ## The `TestSpecs` sample depends on this seed, type XSealKey = array[EXTRA_SEAL,byte] XSealValue = object blockNumber: uint64 account: string TesterPool* = ref object ## Pool to maintain currently active tester accounts, ## mapped from textual names used in the tests below ## to actual Ethereum private keys capable of signing ## transactions. prng: uint32 ## random state accounts: Table[string,PrivateKey] ## accounts table networkId: NetworkId boot: NetworkParams ## imported Genesis configuration batch: seq[seq[BlockHeader]] ## collect header chains chain: ChainRef names: Table[EthAddress,string] ## reverse lookup for debugging xSeals: Table[XSealKey,XSealValue] ## collect signatures for debugging noisy*: bool # ------------------------------------------------------------------------------ # Private Prng (Clique keeps generated addresses sorted) # ------------------------------------------------------------------------------ proc posixPrngInit(state: var uint32; seed: uint32) = state = seed proc posixPrngRand(state: var uint32): byte = ## POSIX.1-2001 example of a rand() implementation, see manual page rand(3). ## ## Clique relies on the even/odd position of an address after sorting. For ## address generation, the Nim PRNG was used which seems to have changed ## with Nim 1.6.11 (Linux, Windoes only.) ## ## The `TestSpecs` sample depends on `prngSeed` and `posixPrngRand()`. state = state * 1103515245 + 12345; let val = (state shr 16) and 32767 # mod 2^31 (val shr 8).byte # Extract second byte # ------------------------------------------------------------------------------ # Private Helpers # ------------------------------------------------------------------------------ proc getBlockHeader(ap: TesterPool; number: BlockNumber): BlockHeader = ## Shortcut => db/core_db.getBlockHeader() doAssert ap.chain.clique.db.getBlockHeader(number, result) proc getBlockHeader(ap: TesterPool; hash: Hash256): BlockHeader = ## Shortcut => db/core_db.getBlockHeader() doAssert ap.chain.clique.db.getBlockHeader(hash, result) proc isZero(a: openArray[byte]): bool = result = true for w in a: if w != 0: return false proc rand(ap: TesterPool): byte = ap.prng.posixPrngRand().byte proc newPrivateKey(ap: TesterPool): PrivateKey = ## Roughly modelled after `random(PrivateKey,getRng()[])` with ## non-secure but reproducible PRNG var data{.noinit.}: array[SkRawSecretKeySize,byte] for n in 0 ..< data.len: data[n] = ap.rand # verify generated key, see keys.random(PrivateKey) from eth/keys.nim var dataPtr0 = cast[ptr byte](unsafeAddr data[0]) doAssert secp256k1_ec_seckey_verify( secp256k1_context_no_precomp, dataPtr0) == 1 # Convert to PrivateKey PrivateKey.fromRaw(data).value proc privateKey(ap: TesterPool; account: string): PrivateKey = ## Return private key for given tester `account` if account != "": if account in ap.accounts: result = ap.accounts[account] else: result = ap.newPrivateKey ap.accounts[account] = result let address = result.toPublicKey.toCanonicalAddress ap.names[address] = account # ------------------------------------------------------------------------------ # Private pretty printer call backs # ------------------------------------------------------------------------------ proc findName(ap: TesterPool; address: EthAddress): string = ## Find name for a particular address if address notin ap.names: ap.names[address] = &"X{ap.names.len+1}" ap.names[address] proc findSignature(ap: TesterPool; sig: openArray[byte]): XSealValue = ## Find a previusly registered signature if sig.len == XSealKey.len: let key = toArray(XSealKey.len,sig) if key in ap.xSeals: result = ap.xSeals[key] proc pp(ap: TesterPool; v: BlockNonce): string = ## Pretty print nonce if v == NONCE_AUTH: "AUTH" elif v == NONCE_DROP: "DROP" else: &"0x{v.toHex}" proc pp(ap: TesterPool; v: EthAddress): string = ## Pretty print address if v.isZero: result = "@0" else: let a = ap.findName(v) if a == "": result = &"@{v}" else: result = &"@{a}" proc pp*(ap: TesterPool; v: openArray[EthAddress]): seq[string] = ## Pretty print address list toSeq(v).mapIt(ap.pp(it)) proc pp(ap: TesterPool; v: Blob): string = ## Visualise `extraData` field if v.len < EXTRA_VANITY + EXTRA_SEAL or ((v.len - (EXTRA_VANITY + EXTRA_SEAL)) mod EthAddress.len) != 0: result = &"0x{v.toHex}[{v.len}]" else: var data = v # # extra vanity prefix let vanity = data[0 ..< EXTRA_VANITY] data = data[EXTRA_VANITY ..< data.len] result = if vanity.isZero: "0u256+" else: &"{vanity.toHex}+" # # list of addresses if EthAddress.len + EXTRA_SEAL <= data.len: var glue = "[" while EthAddress.len + EXTRA_SEAL <= data.len: let address = toArray(EthAddress.len,data[0 ..< EthAddress.len]) data = data[EthAddress.len ..< data.len] result &= &"{glue}{ap.pp(address)}" glue = "," result &= "]+" # # signature let val = ap.findSignature(data) if val.account != "": result &= &"<#{val.blockNumber},{val.account}>" elif data.isZero: result &= &"<0>" else: let sig = SkSignature.fromRaw(data) if sig.isOk: result &= &"<{sig.value.toHex}>" else: result &= &"0x{data.toHex}[{data.len}]" proc pp(ap: TesterPool; v: Vote): string = proc authorized(b: bool): string = if b: "authorise" else: "de-authorise" "(" & &"address={ap.pp(v.address)}" & &",signer={ap.pp(v.signer)}" & &",blockNumber=#{v.blockNumber}" & &",{authorized(v.authorize)}" & ")" proc pp(ap: TesterPool; h: AddressHistory): string = toSeq(h.keys) .sorted .mapIt("#" & $it & ":" & ap.pp(h[it.u256])) .join(",") proc votesList(ap: TesterPool; s: Snapshot; sep: string): string = proc s3Cmp(a, b: (string,string,Vote)): int = result = cmp(a[0], b[0]) if result == 0: result = cmp(a[1], b[1]) let votes = s.ballot.votesInternal votes.mapIt((ap.pp(it[0]),ap.pp(it[1]),it[2])) .sorted(cmp = s3Cmp) .mapIt(ap.pp(it[2])) .join(sep) proc signersList(ap: TesterPool; s: Snapshot): string = ap.pp(s.ballot.authSigners).sorted.join(",") proc pp*(ap: TesterPool; s: Snapshot; delim: string): string = ## Pretty print descriptor let p1 = if 0 < delim.len: delim else: ";" p2 = if 0 < delim.len and delim[0] == '\n': delim & ' '.repeat(7) else: ";" "(" & &"blockNumber=#{s.blockNumber}" & &"{p1}recents=" & "{" & ap.pp(s.recents) & "}" & &"{p1}signers=" & "{" & ap.signersList(s) & "}" & &"{p1}votes=[" & ap.votesList(s,p2) & "])" proc pp*(ap: TesterPool; s: Snapshot; indent = 0): string = ## Pretty print descriptor let delim = if 0 < indent: "\n" & ' '.repeat(indent) else: " " ap.pp(s, delim) proc pp(ap: TesterPool; v: BlockHeader; delim: string): string = ## Pretty print block header let sep = if 0 < delim.len: delim else: ";" &"(blockNumber=#{v.blockNumber}" & &"{sep}parentHash={v.parentHash}" & &"{sep}selfHash={v.blockHash}" & &"{sep}stateRoot={v.stateRoot}" & &"{sep}coinbase={ap.pp(v.coinbase)}" & &"{sep}nonce={ap.pp(v.nonce)}" & &"{sep}extraData={ap.pp(v.extraData)})" proc pp(ap: TesterPool; v: BlockHeader; indent = 3): string = ## Pretty print block header, NL delimited, indented fields let delim = if 0 < indent: "\n" & ' '.repeat(indent) else: " " ap.pp(v, delim) # ------------------------------------------------------------------------------ # Private: Constructor helpers # ------------------------------------------------------------------------------ proc resetChainDb(ap: TesterPool; extraData: Blob; debug = false) = ## Setup new block chain with bespoke genesis # new genesis block if 0 < extraData.len: ap.boot.genesis.extraData = extraData let com = CommonRef.new( newCoreDbRef LegacyDbMemory, networkId = ap.networkId, params = ap.boot) ap.chain = newChain(com) com.initializeEmptyDB() ap.noisy = debug proc initTesterPool(ap: TesterPool): TesterPool {.discardable.} = result = ap result.prng.posixPrngInit(prngSeed) result.batch = @[newSeq[BlockHeader]()] result.accounts = initTable[string,PrivateKey]() result.xSeals = initTable[XSealKey,XSealValue]() result.names = initTable[EthAddress,string]() result.resetChainDb(@[]) # ------------------------------------------------------------------------------ # Public: pretty printer support # ------------------------------------------------------------------------------ proc say*(t: TesterPool; v: varargs[string,`$`]) = if t.noisy: stderr.write v.join & "\n" proc sayHeaderChain*(ap: TesterPool; indent = 0): TesterPool {.discardable.} = result = ap let pfx = ' '.repeat(indent) var top = if 0 < ap.batch[^1].len: ap.batch[^1][^1] else: ap.getBlockHeader(0.u256) ap.say pfx, " top header: " & ap.pp(top, 16+indent) while not top.blockNumber.isZero: top = ap.getBlockHeader(top.parentHash) ap.say pfx, "parent header: " & ap.pp(top, 16+indent) # ------------------------------------------------------------------------------ # Public: Constructor # ------------------------------------------------------------------------------ proc newVoterPool*(networkId = GoerliNet): TesterPool = TesterPool( networkId: networkId, boot: networkParams(networkId) ).initTesterPool # ------------------------------------------------------------------------------ # Public: getter # ------------------------------------------------------------------------------ proc chain*(ap: TesterPool): ChainRef = ## Getter ap.chain proc clique*(ap: TesterPool): Clique = ## Getter ap.chain.clique proc db*(ap: TesterPool): CoreDbRef = ## Getter ap.clique.db proc cliqueSigners*(ap: TesterPool): seq[EthAddress] = ## Getter ap.clique.cliqueSigners proc cliqueSignersLen*(ap: TesterPool): int = ## Getter ap.clique.cliqueSignersLen proc snapshot*(ap: TesterPool): Snapshot = ## Getter ap.clique.snapshot proc failed*(ap: TesterPool): CliqueFailed = ## Getter ap.clique.failed # ------------------------------------------------------------------------------ # Public: setter # ------------------------------------------------------------------------------ proc `verifyFrom=`*(ap: TesterPool; verifyFrom: uint64) = ## Setter, block number where `Clique` should start ap.chain.verifyFrom = verifyFrom # ------------------------------------------------------------------------------ # Public functions # ------------------------------------------------------------------------------ # clique/snapshot_test.go(62): func (ap *testerAccountPool) address(account [..] proc address*(ap: TesterPool; account: string): EthAddress = ## retrieves the Ethereum address of a tester account by label, creating ## a new account if no previous one exists yet. if account != "": result = ap.privateKey(account).toPublicKey.toCanonicalAddress # ------------------------------------------------------------------------------ # Public: set up & manage voter database # ------------------------------------------------------------------------------ proc resetVoterChain*(ap: TesterPool; signers: openArray[string]; epoch = 0; runBack = true): TesterPool {.discardable.} = ## Reset the batch list for voter headers and update genesis block result = ap ap.batch = @[newSeq[BlockHeader]()] # clique/snapshot_test.go(384): signers := make([]common.Address, [..] let signers = signers.mapIt(ap.address(it)).sorted(EthAscending) var extraData = 0.byte.repeat(EXTRA_VANITY) # clique/snapshot_test.go(399): for j, signer := range signers { for signer in signers: extraData.add signer.toSeq # clique/snapshot_test.go(397): extraData.add 0.byte.repeat(EXTRA_SEAL) # store modified genesis block and epoch ap.resetChainDb(extraData, ap.noisy) ap.clique.cfg.epoch = epoch ap.clique.applySnapsMinBacklog = runBack # clique/snapshot_test.go(415): blocks, _ := core.GenerateChain(&config, [..] proc appendVoter*(ap: TesterPool; voter: TesterVote): TesterPool {.discardable.} = ## Append a voter header to the block chain batch list result = ap doAssert 0 < ap.batch.len # see initTesterPool() and resetVoterChain() let parent = if ap.batch[^1].len == 0: ap.getBlockHeader(0.u256) else: ap.batch[^1][^1] let header = ap.chain.clique.cliqueGenvote( voter = ap.address(voter.voted), seal = ap.privateKey(voter.signer), parent = parent, elapsed = EthTime(100), voteInOk = voter.auth, outOfTurn = voter.noTurn, checkPoint = voter.checkpoint.mapIt(ap.address(it)).sorted(EthAscending)) if 0 < voter.checkpoint.len: doAssert (header.blockNumber mod ap.clique.cfg.epoch) == 0 # Register for debugging let extraLen = header.extraData.len extraSeal = header.extraData[extraLen - EXTRA_SEAL ..< extraLen] ap.xSeals[toArray(XSealKey.len,extraSeal)] = XSealValue( blockNumber: header.blockNumber.truncate(uint64), account: voter.signer) if voter.newbatch: ap.batch.add @[] ap.batch[^1].add header proc appendVoter*(ap: TesterPool; voters: openArray[TesterVote]): TesterPool {.discardable.} = ## Append a list of voter headers to the block chain batch list result = ap for voter in voters: ap.appendVoter(voter) proc commitVoterChain*(ap: TesterPool; postProcessOk = false; stopFaultyHeader = false): TesterPool {.discardable.} = ## Write the headers from the voter header batch list to the block chain DB. ## ## If `postProcessOk` is set, an additional verification step is added at ## the end of each transaction. ## ## if `stopFaultyHeader` is set, the function stops immediately on error. ## Otherwise the offending block is removed, the rest of the batch is ## adjusted and applied again repeatedly. result = ap var reChainOk = false for n in 0 ..< ap.batch.len: block forLoop: var headers = ap.batch[n] while true: if headers.len == 0: break forLoop # continue with for loop ap.say &"*** transaction ({n}) list: [", headers.mapIt(&"#{it.blockNumber}").join(", "), "]" # Realign rest of transaction to existing block chain if reChainOk: var parent = ap.chain.clique.db.getCanonicalHead for i in 0 ..< headers.len: headers[i].parentHash = parent.blockHash headers[i].blockNumber = parent.blockNumber + 1 parent = headers[i] # Perform transaction into the block chain let bodies = BlockBody().repeat(headers.len) if ap.chain.persistBlocks(headers,bodies) == ValidationResult.OK: break if stopFaultyHeader: return # If the offending block is the last one of the last transaction, # then there is nothing to do. let culprit = headers.filterIt(ap.failed[0] == it.blockHash) doAssert culprit.len == 1 let number = culprit[0].blockNumber if n + 1 == ap.batch.len and number == headers[^1].blockNumber: return # Remove offending block and try again for the rest ap.say "*** persistBlocks failed, omitting block #", culprit let prevLen = headers.len headers = headers.filterIt(number != it.blockNumber) doAssert headers.len < prevLen reChainOk = true if ap.noisy: ap.say "*** snapshot argument: #", headers[^1].blockNumber ap.sayHeaderChain(8) when false: # all addresses are typically pp-mappable ap.say " address map: ", toSeq(ap.names.pairs) .mapIt(&"@{it[1]}:{it[0]}") .sorted .join("\n" & ' '.repeat(23)) if postProcessOk: discard ap.clique.cliqueSnapshot(headers[^1]) # ------------------------------------------------------------------------------ # End # ------------------------------------------------------------------------------