nimbus-eth1/nimbus/genesis.nim

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import
std/tables,
eth/[common, rlp, p2p],
chronicles, eth/trie/[db, trie_defs],
./db/[db_chain, state_db],
"."/[constants, chain_config, forks, p2p/gaslimit]
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{.push raises: [Defect].}
# ------------------------------------------------------------------------------
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# Public functions
# ------------------------------------------------------------------------------
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proc newStateDB*(db: TrieDatabaseRef, pruneTrie: bool): AccountStateDB =
newAccountStateDB(db, emptyRlpHash, pruneTrie)
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proc toGenesisHeader*(db: BaseChainDB, sdb: AccountStateDB): BlockHeader
{.raises: [Defect, RlpError].} =
## Initialise block chain DB accounts derived from the `genesis.alloc` table
## of the `db` descriptor argument.
##
## The function returns the `Genesis` block header.
##
# For `eth/trie/db.newMemoryDB()`, the following initialisation is part of
# the constructor function which is missing for the permanent constructor
# function `eth/trie/db.trieDB()`.
db.db.put(emptyRlpHash.data, emptyRlp)
let g = db.genesis
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for address, account in g.alloc:
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sdb.setAccount(address, newAccount(account.nonce, account.balance))
sdb.setCode(address, account.code)
# Kludge:
#
# With the pruning persistent version, the initial/trivial key-value
# pair `(emptyRlpHash.data,emptyRlp)` will have been deleted after
# adding a non-trivial key-value pair in one of the above functions.
# This happens in the function/template
#
# eth/trie/db.del() called by
# eth/trie/hexary.prune() invoked by
# eth/trie/hexary.origWithNewValue() invoked by
# eth/trie/hexary.mergeAt() called by
# eth/trie/hexary.put()
#
# if the database contains the trivial key-value pair, only.
# Unfortunately, the *trie* is now empty but the previous root hash
# is re-used. This leads to an assert exception in any subsequent
# invocation of `eth/trie/hexary.put()`.
#
# See also https://github.com/status-im/nim-eth/issues/9 where other,
# probably related debilities are discussed.
#
# This kludge also fixes the initial crash described in
# https://github.com/status-im/nimbus-eth1/issues/932.
if not db.isNil and db.pruneTrie and 0 < account.storage.len:
db.db.put(emptyRlpHash.data, emptyRlp) # <-- kludge
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for k, v in account.storage:
sdb.setStorage(address, k, v)
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result = BlockHeader(
nonce: g.nonce,
timestamp: g.timestamp,
extraData: g.extraData,
gasLimit: g.gasLimit,
difficulty: g.difficulty,
mixDigest: g.mixhash,
coinbase: g.coinbase,
stateRoot: sdb.rootHash,
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parentHash: GENESIS_PARENT_HASH,
txRoot: BLANK_ROOT_HASH,
receiptRoot: BLANK_ROOT_HASH,
ommersHash: EMPTY_UNCLE_HASH
)
if g.baseFeePerGas.isSome:
result.baseFee = g.baseFeePerGas.get()
elif db.config.toFork(0.toBlockNumber) >= FkLondon:
result.baseFee = EIP1559_INITIAL_BASE_FEE.u256
if g.gasLimit.isZero:
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result.gasLimit = GENESIS_GAS_LIMIT
if g.difficulty.isZero:
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result.difficulty = GENESIS_DIFFICULTY
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proc toGenesisHeader*(params: NetworkParams): BlockHeader
{.raises: [Defect, RlpError].} =
## Generate the genesis block header from the `params` argument value.
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let cdb = newBaseChainDB(
db = newMemoryDb(),
id = params.config.chainID.NetworkId,
params = params,
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pruneTrie = true)
let sdb = newStateDB(cdb.db, cdb.pruneTrie)
cdb.toGenesisHeader(sdb)
proc toGenesisHeader*(db: BaseChainDB): BlockHeader
{.raises: [Defect, RlpError].} =
## Generate the genesis block header from the `genesis` and `config`
## fields of the argument `db` descriptor.
NetworkParams(
config: db.config,
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genesis: db.genesis).toGenesisHeader()
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proc initializeEmptyDb*(cdb: BaseChainDB)
{.raises: [Defect, CatchableError].} =
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trace "Writing genesis to DB"
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let sdb = newStateDB(cdb.db, cdb.pruneTrie)
let header = cdb.toGenesisHeader(sdb)
doAssert(header.blockNumber.isZero, "can't commit genesis block with number > 0")
# faster lookup of curent total difficulty
cdb.totalDifficulty = header.difficulty
discard cdb.persistHeaderToDb(header)
# ------------------------------------------------------------------------------
# End
# ------------------------------------------------------------------------------