321 lines
12 KiB
Nim
321 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 http://www.apache.org/licenses/LICENSE-2.0)
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# * MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)
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# at your option. This file may not be copied, modified, or distributed except according to those terms.
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import
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sequtils, algorithm,
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stew/[byteutils], eth/trie/[hexary, db],
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eth/[common, rlp], chronicles,
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../errors, ../constants, ./storage_types,
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../utils, ../config
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type
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BaseChainDB* = ref object
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db* : TrieDatabaseRef
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pruneTrie*: bool
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config* : ChainConfig
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# startingBlock, currentBlock, and highestBlock
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# are progress indicator
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startingBlock*: BlockNumber
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currentBlock*: BlockNumber
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highestBlock*: BlockNumber
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TransactionKey = tuple
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blockNumber: BlockNumber
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index: int
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proc newBaseChainDB*(db: TrieDatabaseRef, pruneTrie: bool = true, id: PublicNetwork = MainNet): BaseChainDB =
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new(result)
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result.db = db
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result.pruneTrie = pruneTrie
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result.config = publicChainConfig(id)
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proc `$`*(db: BaseChainDB): string =
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result = "BaseChainDB"
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proc exists*(self: BaseChainDB, hash: Hash256): bool =
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self.db.contains(hash.data)
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proc getBlockHeader*(self: BaseChainDB; blockHash: Hash256, output: var BlockHeader): bool =
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let data = self.db.get(genericHashKey(blockHash).toOpenArray)
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if data.len != 0:
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output = rlp.decode(data, BlockHeader)
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result = true
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proc getBlockHeader*(self: BaseChainDB, blockHash: Hash256): BlockHeader =
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## Returns the requested block header as specified by block hash.
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##
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## Raises BlockNotFound if it is not present in the db.
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if not self.getBlockHeader(blockHash, result):
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raise newException(BlockNotFound, "No block with hash " & blockHash.data.toHex)
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proc getHash(self: BaseChainDB, key: DbKey, output: var Hash256): bool {.inline.} =
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let data = self.db.get(key.toOpenArray)
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if data.len != 0:
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output = rlp.decode(data, Hash256)
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result = true
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proc getCanonicalHead*(self: BaseChainDB): BlockHeader =
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var headHash: Hash256
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if not self.getHash(canonicalHeadHashKey(), headHash) or
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not self.getBlockHeader(headHash, result):
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raise newException(CanonicalHeadNotFound,
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"No canonical head set for this chain")
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proc populateProgress*(self: BaseChainDB) =
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try:
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self.startingBlock = self.getCanonicalHead().blockNumber
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except CanonicalHeadNotFound:
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self.startingBlock = toBlockNumber(0)
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self.currentBlock = self.startingBlock
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self.highestBlock = self.startingBlock
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proc getBlockHash*(self: BaseChainDB, n: BlockNumber, output: var Hash256): bool {.inline.} =
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## Return the block hash for the given block number.
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self.getHash(blockNumberToHashKey(n), output)
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proc getBlockHash*(self: BaseChainDB, n: BlockNumber): Hash256 {.inline.} =
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## Return the block hash for the given block number.
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if not self.getHash(blockNumberToHashKey(n), result):
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raise newException(BlockNotFound, "No block hash for number " & $n)
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proc getBlockHeader*(self: BaseChainDB; n: BlockNumber, output: var BlockHeader): bool =
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## Returns the block header with the given number in the canonical chain.
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var blockHash: Hash256
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if self.getBlockHash(n, blockHash):
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result = self.getBlockHeader(blockHash, output)
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proc getBlockHeader*(self: BaseChainDB; n: BlockNumber): BlockHeader =
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## Returns the block header with the given number in the canonical chain.
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## Raises BlockNotFound error if the block is not in the DB.
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self.getBlockHeader(self.getBlockHash(n))
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proc getScore*(self: BaseChainDB; blockHash: Hash256): Uint256 =
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rlp.decode(self.db.get(blockHashToScoreKey(blockHash).toOpenArray), Uint256)
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proc getAncestorsHashes*(self: BaseChainDB, limit: Uint256, header: BlockHeader): seq[Hash256] =
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var ancestorCount = min(header.blockNumber, limit).truncate(int)
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var h = header
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result = newSeq[Hash256](ancestorCount)
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while ancestorCount > 0:
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h = self.getBlockHeader(h.parentHash)
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result[ancestorCount - 1] = h.hash
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dec ancestorCount
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iterator findNewAncestors(self: BaseChainDB; header: BlockHeader): BlockHeader =
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## Returns the chain leading up from the given header until the first ancestor it has in
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## common with our canonical chain.
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var h = header
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var orig: BlockHeader
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while true:
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if self.getBlockHeader(h.blockNumber, orig) and orig.hash == h.hash:
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break
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yield h
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if h.parentHash == GENESIS_PARENT_HASH:
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break
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else:
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h = self.getBlockHeader(h.parentHash)
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proc addBlockNumberToHashLookup*(self: BaseChainDB; header: BlockHeader) =
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self.db.put(blockNumberToHashKey(header.blockNumber).toOpenArray,
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rlp.encode(header.hash))
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proc persistTransactions*(self: BaseChainDB, blockNumber:
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BlockNumber, transactions: openArray[Transaction]): Hash256 =
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var trie = initHexaryTrie(self.db)
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for idx, tx in transactions:
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let
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encodedTx = rlp.encode(tx)
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txHash = keccakHash(encodedTx)
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txKey: TransactionKey = (blockNumber, idx)
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trie.put(rlp.encode(idx), encodedTx)
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self.db.put(transactionHashToBlockKey(txHash).toOpenArray, rlp.encode(txKey))
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trie.rootHash
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proc getTransaction*(self: BaseChainDB, txRoot: Hash256, txIndex: int, res: var Transaction): bool =
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var db = initHexaryTrie(self.db, txRoot)
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let txData = db.get(rlp.encode(txIndex))
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if txData.len > 0:
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res = rlp.decode(txData, Transaction)
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result = true
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iterator getBlockTransactionData*(self: BaseChainDB, transactionRoot: Hash256): seq[byte] =
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var transactionDb = initHexaryTrie(self.db, transactionRoot)
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var transactionIdx = 0
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while true:
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let transactionKey = rlp.encode(transactionIdx)
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if transactionKey in transactionDb:
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yield transactionDb.get(transactionKey)
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else:
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break
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inc transactionIdx
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iterator getBlockTransactions*(self: BaseChainDB, header: BlockHeader): Transaction =
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for encodedTx in self.getBlockTransactionData(header.txRoot):
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yield rlp.decode(encodedTx, Transaction)
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iterator getBlockTransactionHashes*(self: BaseChainDB, blockHeader: BlockHeader): Hash256 =
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## Returns an iterable of the transaction hashes from th block specified
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## by the given block header.
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for encodedTx in self.getBlockTransactionData(blockHeader.txRoot):
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yield keccakHash(encodedTx)
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proc getTransactionCount*(chain: BaseChainDB, txRoot: Hash256): int =
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var trie = initHexaryTrie(chain.db, txRoot)
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var txCount = 0
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while true:
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let txKey = rlp.encode(txCount)
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if txKey notin trie:
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break
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inc txCount
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proc getUnclesCount*(self: BaseChainDB, ommersHash: Hash256): int =
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if ommersHash != EMPTY_UNCLE_HASH:
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let encodedUncles = self.db.get(genericHashKey(ommersHash).toOpenArray)
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if encodedUncles.len != 0:
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let r = rlpFromBytes(encodedUncles)
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result = r.listLen
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proc getUncles*(self: BaseChainDB, ommersHash: Hash256): seq[BlockHeader] =
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if ommersHash != EMPTY_UNCLE_HASH:
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let encodedUncles = self.db.get(genericHashKey(ommersHash).toOpenArray)
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if encodedUncles.len != 0:
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result = rlp.decode(encodedUncles, seq[BlockHeader])
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proc getBlockBody*(self: BaseChainDB, blockHash: Hash256, output: var BlockBody): bool =
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var header: BlockHeader
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if self.getBlockHeader(blockHash, header):
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result = true
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output.transactions = @[]
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output.uncles = @[]
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for encodedTx in self.getBlockTransactionData(header.txRoot):
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output.transactions.add(rlp.decode(encodedTx, Transaction))
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if header.ommersHash != EMPTY_UNCLE_HASH:
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let encodedUncles = self.db.get(genericHashKey(header.ommersHash).toOpenArray)
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if encodedUncles.len != 0:
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output.uncles = rlp.decode(encodedUncles, seq[BlockHeader])
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else:
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result = false
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proc getBlockBody*(self: BaseChainDB, hash: Hash256): BlockBody =
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if not self.getBlockBody(hash, result):
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raise newException(ValueError, "Error when retrieving block body")
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proc getUncleHashes*(self: BaseChainDB, blockHashes: openArray[Hash256]): seq[Hash256] =
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for blockHash in blockHashes:
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var blockBody = self.getBlockBody(blockHash)
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for uncle in blockBody.uncles:
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result.add uncle.hash
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proc getUncleHashes*(self: BaseChainDB, header: BlockHeader): seq[Hash256] =
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if header.ommersHash != EMPTY_UNCLE_HASH:
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let encodedUncles = self.db.get(genericHashKey(header.ommersHash).toOpenArray)
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if encodedUncles.len != 0:
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let uncles = rlp.decode(encodedUncles, seq[BlockHeader])
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for x in uncles:
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result.add x.hash
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proc getTransactionKey*(self: BaseChainDB, transactionHash: Hash256): tuple[blockNumber: BlockNumber, index: int] {.inline.} =
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let tx = self.db.get(transactionHashToBlockKey(transactionHash).toOpenArray)
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if tx.len > 0:
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let key = rlp.decode(tx, TransactionKey)
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result = (key.blockNumber, key.index)
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else:
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result = (0.toBlockNumber, -1)
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proc removeTransactionFromCanonicalChain(self: BaseChainDB, transactionHash: Hash256) {.inline.} =
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## Removes the transaction specified by the given hash from the canonical chain.
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self.db.del(transactionHashToBlockKey(transactionHash).toOpenArray)
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proc setAsCanonicalChainHead(self: BaseChainDB; headerHash: Hash256): seq[BlockHeader] =
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## Sets the header as the canonical chain HEAD.
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let header = self.getBlockHeader(headerHash)
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var newCanonicalHeaders = sequtils.toSeq(findNewAncestors(self, header))
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reverse(newCanonicalHeaders)
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for h in newCanonicalHeaders:
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var oldHash: Hash256
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if not self.getBlockHash(h.blockNumber, oldHash):
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break
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let oldHeader = self.getBlockHeader(oldHash)
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for txHash in self.getBlockTransactionHashes(oldHeader):
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self.removeTransactionFromCanonicalChain(txHash)
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# TODO re-add txn to internal pending pool (only if local sender)
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for h in newCanonicalHeaders:
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self.addBlockNumberToHashLookup(h)
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self.db.put(canonicalHeadHashKey().toOpenArray, rlp.encode(headerHash))
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return newCanonicalHeaders
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proc setHead*(self: BaseChainDB, header: BlockHeader, writeHeader = false) =
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var headerHash = rlpHash(header)
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if writeHeader:
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self.db.put(genericHashKey(headerHash).toOpenArray, rlp.encode(header))
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self.addBlockNumberToHashLookup(header)
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self.db.put(canonicalHeadHashKey().toOpenArray, rlp.encode(headerHash))
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proc headerExists*(self: BaseChainDB; blockHash: Hash256): bool =
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## Returns True if the header with the given block hash is in our DB.
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self.db.contains(genericHashKey(blockHash).toOpenArray)
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proc persistReceipts*(self: BaseChainDB, receipts: openArray[Receipt]): Hash256 =
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var trie = initHexaryTrie(self.db)
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for idx, rec in receipts:
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trie.put(rlp.encode(idx), rlp.encode(rec))
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trie.rootHash
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iterator getReceipts*(self: BaseChainDB; header: BlockHeader): Receipt =
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var receiptDb = initHexaryTrie(self.db, header.receiptRoot)
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var receiptIdx = 0
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while true:
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let receiptKey = rlp.encode(receiptIdx)
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if receiptKey in receiptDb:
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let receiptData = receiptDb.get(receiptKey)
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yield rlp.decode(receiptData, Receipt)
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else:
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break
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inc receiptIdx
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proc persistHeaderToDb*(self: BaseChainDB; header: BlockHeader): seq[BlockHeader] =
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let isGenesis = header.parentHash == GENESIS_PARENT_HASH
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let headerHash = header.blockHash
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if not isGenesis and not self.headerExists(header.parentHash):
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raise newException(ParentNotFound, "Cannot persist block header " &
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$headerHash & " with unknown parent " & $header.parentHash)
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self.db.put(genericHashKey(headerHash).toOpenArray, rlp.encode(header))
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let score = if isGenesis: header.difficulty
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else: self.getScore(header.parentHash) + header.difficulty
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self.db.put(blockHashToScoreKey(headerHash).toOpenArray, rlp.encode(score))
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self.addBlockNumberToHashLookup(header)
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var headScore: Uint256
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try:
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headScore = self.getScore(self.getCanonicalHead().hash)
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except CanonicalHeadNotFound:
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return self.setAsCanonicalChainHead(headerHash)
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if score > headScore:
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result = self.setAsCanonicalChainHead(headerHash)
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proc persistUncles*(self: BaseChainDB, uncles: openarray[BlockHeader]): Hash256 =
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## Persists the list of uncles to the database.
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## Returns the uncles hash.
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let enc = rlp.encode(uncles)
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result = keccakHash(enc)
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self.db.put(genericHashKey(result).toOpenArray, enc)
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