nimbus-eth1/nimbus/db/db_chain.nim

438 lines
16 KiB
Nim

# Nimbus
# Copyright (c) 2018 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/[sequtils, algorithm],
stew/[byteutils], eth/trie/[hexary, db],
eth/[common, rlp, p2p], chronicles,
".."/[errors, constants, utils, chain_config],
"."/storage_types
type
BaseChainDB* = ref object
db* : TrieDatabaseRef
pruneTrie*: bool
networkId*: NetworkId
config* : ChainConfig
genesis* : Genesis
totalDifficulty*: DifficultyInt
# startingBlock, currentBlock, and highestBlock
# are progress indicator
startingBlock*: BlockNumber
currentBlock*: BlockNumber
highestBlock*: BlockNumber
TransactionKey = tuple
blockNumber: BlockNumber
index: int
proc getTotalDifficulty*(self: BaseChainDB): UInt256 =
# this is actually a combination of `getHash` and `getScore`
const key = canonicalHeadHashKey()
let data = self.db.get(key.toOpenArray)
if data.len == 0:
return 0.u256
let blockHash = rlp.decode(data, Hash256)
rlp.decode(self.db.get(blockHashToScoreKey(blockHash).toOpenArray), Uint256)
proc newBaseChainDB*(
db: TrieDatabaseRef,
pruneTrie: bool = true,
id: NetworkId = MainNet,
params = networkParams(MainNet)): BaseChainDB =
new(result)
result.db = db
result.pruneTrie = pruneTrie
result.networkId = id
result.config = params.config
result.genesis = params.genesis
result.totalDifficulty = result.getTotalDifficulty()
proc `$`*(db: BaseChainDB): string =
result = "BaseChainDB"
proc ttd*(db: BaseChainDB): DifficultyInt =
if db.config.terminalTotalDifficulty.isSome:
db.config.terminalTotalDifficulty.get()
else:
high(DifficultyInt)
proc networkParams*(db: BaseChainDB): NetworkParams =
NetworkParams(config: db.config, genesis: db.genesis)
proc exists*(self: BaseChainDB, hash: Hash256): bool =
self.db.contains(hash.data)
proc getBlockHeader*(self: BaseChainDB; blockHash: Hash256, output: var BlockHeader): bool =
let data = self.db.get(genericHashKey(blockHash).toOpenArray)
if data.len != 0:
try:
output = rlp.decode(data, BlockHeader)
true
except RlpError:
false
else:
false
proc getBlockHeader*(self: BaseChainDB, blockHash: Hash256): BlockHeader =
## Returns the requested block header as specified by block hash.
##
## Raises BlockNotFound if it is not present in the db.
if not self.getBlockHeader(blockHash, result):
raise newException(BlockNotFound, "No block with hash " & blockHash.data.toHex)
proc getHash(self: BaseChainDB, key: DbKey, output: var Hash256): bool {.inline.} =
let data = self.db.get(key.toOpenArray)
if data.len != 0:
output = rlp.decode(data, Hash256)
result = true
proc getCanonicalHead*(self: BaseChainDB): BlockHeader =
var headHash: Hash256
if not self.getHash(canonicalHeadHashKey(), headHash) or
not self.getBlockHeader(headHash, result):
raise newException(CanonicalHeadNotFound,
"No canonical head set for this chain")
proc populateProgress*(self: BaseChainDB) =
try:
self.startingBlock = self.getCanonicalHead().blockNumber
except CanonicalHeadNotFound:
self.startingBlock = toBlockNumber(0)
self.currentBlock = self.startingBlock
self.highestBlock = self.startingBlock
proc getBlockHash*(self: BaseChainDB, n: BlockNumber, output: var Hash256): bool {.inline.} =
## Return the block hash for the given block number.
self.getHash(blockNumberToHashKey(n), output)
proc getBlockHash*(self: BaseChainDB, n: BlockNumber): Hash256 {.inline.} =
## Return the block hash for the given block number.
if not self.getHash(blockNumberToHashKey(n), result):
raise newException(BlockNotFound, "No block hash for number " & $n)
proc getCurrentBlockHash*(self: BaseChainDB): Hash256 =
if not self.getHash(blockNumberToHashKey(self.currentBlock), result):
result = Hash256()
proc getBlockHeader*(self: BaseChainDB; n: BlockNumber, output: var BlockHeader): bool =
## Returns the block header with the given number in the canonical chain.
var blockHash: Hash256
if self.getBlockHash(n, blockHash):
result = self.getBlockHeader(blockHash, output)
proc getBlockHeader*(self: BaseChainDB; n: BlockNumber): BlockHeader =
## Returns the block header with the given number in the canonical chain.
## Raises BlockNotFound error if the block is not in the DB.
self.getBlockHeader(self.getBlockHash(n))
proc getScore*(self: BaseChainDB; blockHash: Hash256): Uint256 =
rlp.decode(self.db.get(blockHashToScoreKey(blockHash).toOpenArray), Uint256)
proc getTd*(self: BaseChainDB; blockHash: Hash256, td: var Uint256): bool =
let bytes = self.db.get(blockHashToScoreKey(blockHash).toOpenArray)
if bytes.len == 0: return false
try:
td = rlp.decode(bytes, Uint256)
except RlpError:
return false
return true
proc getAncestorsHashes*(self: BaseChainDB, limit: Uint256, header: BlockHeader): seq[Hash256] =
var ancestorCount = min(header.blockNumber, limit).truncate(int)
var h = header
result = newSeq[Hash256](ancestorCount)
while ancestorCount > 0:
h = self.getBlockHeader(h.parentHash)
result[ancestorCount - 1] = h.hash
dec ancestorCount
iterator findNewAncestors(self: BaseChainDB; header: BlockHeader): BlockHeader =
## Returns the chain leading up from the given header until the first ancestor it has in
## common with our canonical chain.
var h = header
var orig: BlockHeader
while true:
if self.getBlockHeader(h.blockNumber, orig) and orig.hash == h.hash:
break
yield h
if h.parentHash == GENESIS_PARENT_HASH:
break
else:
h = self.getBlockHeader(h.parentHash)
proc addBlockNumberToHashLookup*(self: BaseChainDB; header: BlockHeader) =
self.db.put(blockNumberToHashKey(header.blockNumber).toOpenArray,
rlp.encode(header.hash))
proc persistTransactions*(self: BaseChainDB, blockNumber:
BlockNumber, transactions: openArray[Transaction]): Hash256 =
var trie = initHexaryTrie(self.db)
for idx, tx in transactions:
let
encodedTx = rlp.encode(tx)
txHash = keccakHash(encodedTx)
txKey: TransactionKey = (blockNumber, idx)
trie.put(rlp.encode(idx), encodedTx)
self.db.put(transactionHashToBlockKey(txHash).toOpenArray, rlp.encode(txKey))
trie.rootHash
proc getTransaction*(self: BaseChainDB, txRoot: Hash256, txIndex: int, res: var Transaction): bool =
var db = initHexaryTrie(self.db, txRoot)
let txData = db.get(rlp.encode(txIndex))
if txData.len > 0:
res = rlp.decode(txData, Transaction)
result = true
iterator getBlockTransactionData*(self: BaseChainDB, transactionRoot: Hash256): seq[byte] =
var transactionDb = initHexaryTrie(self.db, transactionRoot)
var transactionIdx = 0
while true:
let transactionKey = rlp.encode(transactionIdx)
if transactionKey in transactionDb:
yield transactionDb.get(transactionKey)
else:
break
inc transactionIdx
iterator getBlockTransactions*(self: BaseChainDB, header: BlockHeader): Transaction =
for encodedTx in self.getBlockTransactionData(header.txRoot):
yield rlp.decode(encodedTx, Transaction)
iterator getBlockTransactionHashes*(self: BaseChainDB, blockHeader: BlockHeader): Hash256 =
## Returns an iterable of the transaction hashes from th block specified
## by the given block header.
for encodedTx in self.getBlockTransactionData(blockHeader.txRoot):
yield keccakHash(encodedTx)
proc getTransactionCount*(chain: BaseChainDB, txRoot: Hash256): int =
var trie = initHexaryTrie(chain.db, txRoot)
var txCount = 0
while true:
let txKey = rlp.encode(txCount)
if txKey notin trie:
break
inc txCount
txCount
proc getUnclesCount*(self: BaseChainDB, ommersHash: Hash256): int =
if ommersHash != EMPTY_UNCLE_HASH:
let encodedUncles = self.db.get(genericHashKey(ommersHash).toOpenArray)
if encodedUncles.len != 0:
let r = rlpFromBytes(encodedUncles)
result = r.listLen
proc getUncles*(self: BaseChainDB, ommersHash: Hash256): seq[BlockHeader] =
if ommersHash != EMPTY_UNCLE_HASH:
let encodedUncles = self.db.get(genericHashKey(ommersHash).toOpenArray)
if encodedUncles.len != 0:
result = rlp.decode(encodedUncles, seq[BlockHeader])
proc getBlockBody*(self: BaseChainDB, blockHash: Hash256, output: var BlockBody): bool =
var header: BlockHeader
if self.getBlockHeader(blockHash, header):
result = true
output.transactions = @[]
output.uncles = @[]
for encodedTx in self.getBlockTransactionData(header.txRoot):
output.transactions.add(rlp.decode(encodedTx, Transaction))
if header.ommersHash != EMPTY_UNCLE_HASH:
let encodedUncles = self.db.get(genericHashKey(header.ommersHash).toOpenArray)
if encodedUncles.len != 0:
output.uncles = rlp.decode(encodedUncles, seq[BlockHeader])
else:
result = false
proc getBlockBody*(self: BaseChainDB, hash: Hash256): BlockBody =
if not self.getBlockBody(hash, result):
raise newException(ValueError, "Error when retrieving block body")
proc getUncleHashes*(self: BaseChainDB, blockHashes: openArray[Hash256]): seq[Hash256] =
for blockHash in blockHashes:
var blockBody = self.getBlockBody(blockHash)
for uncle in blockBody.uncles:
result.add uncle.hash
proc getUncleHashes*(self: BaseChainDB, header: BlockHeader): seq[Hash256] =
if header.ommersHash != EMPTY_UNCLE_HASH:
let encodedUncles = self.db.get(genericHashKey(header.ommersHash).toOpenArray)
if encodedUncles.len != 0:
let uncles = rlp.decode(encodedUncles, seq[BlockHeader])
for x in uncles:
result.add x.hash
proc getTransactionKey*(self: BaseChainDB, transactionHash: Hash256): tuple[blockNumber: BlockNumber, index: int] {.inline.} =
let tx = self.db.get(transactionHashToBlockKey(transactionHash).toOpenArray)
if tx.len > 0:
let key = rlp.decode(tx, TransactionKey)
result = (key.blockNumber, key.index)
else:
result = (0.toBlockNumber, -1)
proc removeTransactionFromCanonicalChain(self: BaseChainDB, transactionHash: Hash256) {.inline.} =
## Removes the transaction specified by the given hash from the canonical chain.
self.db.del(transactionHashToBlockKey(transactionHash).toOpenArray)
proc setAsCanonicalChainHead(self: BaseChainDB; headerHash: Hash256): seq[BlockHeader] =
## Sets the header as the canonical chain HEAD.
let header = self.getBlockHeader(headerHash)
var newCanonicalHeaders = sequtils.toSeq(findNewAncestors(self, header))
reverse(newCanonicalHeaders)
for h in newCanonicalHeaders:
var oldHash: Hash256
if not self.getBlockHash(h.blockNumber, oldHash):
break
let oldHeader = self.getBlockHeader(oldHash)
for txHash in self.getBlockTransactionHashes(oldHeader):
self.removeTransactionFromCanonicalChain(txHash)
# TODO re-add txn to internal pending pool (only if local sender)
for h in newCanonicalHeaders:
self.addBlockNumberToHashLookup(h)
self.db.put(canonicalHeadHashKey().toOpenArray, rlp.encode(headerHash))
return newCanonicalHeaders
proc headerExists*(self: BaseChainDB; blockHash: Hash256): bool =
## Returns True if the header with the given block hash is in our DB.
self.db.contains(genericHashKey(blockHash).toOpenArray)
proc markCanonicalChain(self: BaseChainDB, header: BlockHeader, headerHash: Hash256) =
## mark this chain as canonical by adding block number to hash lookup
## down to forking point
var
currHash = headerHash
currHeader = header
while currHash != Hash256():
let key = blockNumberToHashKey(currHeader.blockNumber)
let data = self.db.get(key.toOpenArray)
if data.len == 0:
# not marked, mark it
self.db.put(key.toOpenArray, rlp.encode(currHash))
elif rlp.decode(data, Hash256) != currHash:
# replace prev chain
self.db.put(key.toOpenArray, rlp.encode(currHash))
else:
# forking point, done
break
currHash = currHeader.parentHash
currHeader = self.getBlockHeader(currHeader.parentHash)
proc setHead*(self: BaseChainDB, blockHash: Hash256): bool =
var header: BlockHeader
if not self.getBlockHeader(blockHash, header):
return false
self.markCanonicalChain(header, blockHash)
self.db.put(canonicalHeadHashKey().toOpenArray, rlp.encode(blockHash))
return true
proc setHead*(self: BaseChainDB, header: BlockHeader, writeHeader = false) =
var headerHash = rlpHash(header)
if writeHeader:
self.db.put(genericHashKey(headerHash).toOpenArray, rlp.encode(header))
self.markCanonicalChain(header, headerHash)
self.db.put(canonicalHeadHashKey().toOpenArray, rlp.encode(headerHash))
proc persistReceipts*(self: BaseChainDB, receipts: openArray[Receipt]): Hash256 =
var trie = initHexaryTrie(self.db)
for idx, rec in receipts:
trie.put(rlp.encode(idx), rlp.encode(rec))
trie.rootHash
iterator getReceipts*(self: BaseChainDB; receiptRoot: Hash256): Receipt =
var receiptDb = initHexaryTrie(self.db, receiptRoot)
var receiptIdx = 0
while true:
let receiptKey = rlp.encode(receiptIdx)
if receiptKey in receiptDb:
let receiptData = receiptDb.get(receiptKey)
yield rlp.decode(receiptData, Receipt)
else:
break
inc receiptIdx
proc readTerminalHash*(self: BaseChainDB; h: var Hash256): bool =
let bytes = self.db.get(terminalHashKey().toOpenArray)
if bytes.len == 0:
return false
try:
h = rlp.decode(bytes, Hash256)
except RlpError:
return false
true
proc writeTerminalHash*(self: BaseChainDB; h: Hash256) =
self.db.put(terminalHashKey().toOpenArray, rlp.encode(h))
proc currentTerminalHeader*(self: BaseChainDB; header: var BlockHeader): bool =
var terminalHash: Hash256
if not self.readTerminalHash(terminalHash):
return false
if not self.getBlockHeader(terminalHash, header):
return false
true
proc persistHeaderToDb*(self: BaseChainDB; header: BlockHeader): seq[BlockHeader] =
let isGenesis = header.parentHash == GENESIS_PARENT_HASH
let headerHash = header.blockHash
if not isGenesis and not self.headerExists(header.parentHash):
raise newException(ParentNotFound, "Cannot persist block header " &
$headerHash & " with unknown parent " & $header.parentHash)
self.db.put(genericHashKey(headerHash).toOpenArray, rlp.encode(header))
let score = if isGenesis: header.difficulty
else: self.getScore(header.parentHash) + header.difficulty
self.db.put(blockHashToScoreKey(headerHash).toOpenArray, rlp.encode(score))
self.addBlockNumberToHashLookup(header)
var headScore: Uint256
try:
headScore = self.getScore(self.getCanonicalHead().hash)
except CanonicalHeadNotFound:
return self.setAsCanonicalChainHead(headerHash)
let ttd = self.ttd()
if headScore < ttd and score >= ttd:
self.writeTerminalHash(headerHash)
if score > headScore:
self.totalDifficulty = score
result = self.setAsCanonicalChainHead(headerHash)
proc persistHeaderToDbWithoutSetHead*(self: BaseChainDB; header: BlockHeader) =
let isGenesis = header.parentHash == GENESIS_PARENT_HASH
let headerHash = header.blockHash
let score = if isGenesis: header.difficulty
else: self.getScore(header.parentHash) + header.difficulty
self.db.put(blockHashToScoreKey(headerHash).toOpenArray, rlp.encode(score))
self.db.put(genericHashKey(headerHash).toOpenArray, rlp.encode(header))
proc persistUncles*(self: BaseChainDB, uncles: openarray[BlockHeader]): Hash256 =
## Persists the list of uncles to the database.
## Returns the uncles hash.
let enc = rlp.encode(uncles)
result = keccakHash(enc)
self.db.put(genericHashKey(result).toOpenArray, enc)