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Calculate post-constructors state root in spec at load time (#5523) 

* apply contract constructors at spec load time

* debugging

* do trie updates in two stages

* add lint exception to newly-dead constructor

* squash warning in RPC tests

* kill dead accountdb constructors

* restore accountdb constructors under test configuration

* use provided state root in spec, if it exists
This commit is contained in:
Robert Habermeier 2017-05-03 09:00:02 +02:00 committed by Gav Wood
parent 5fd5c9e85c
commit 60bb0de9d6
9 changed files with 196 additions and 123 deletions
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4
ethcore/src/account_db.rs
View File

@ -78,6 +78,7 @@ pub struct AccountDB<'db> {
impl<'db> AccountDB<'db> {
/// Create a new AccountDB from an address.
#[cfg(test)]
pub fn new(db: &'db HashDB, address: &Address) -> Self {
Self::from_hash(db, address.sha3())
}
@ -131,6 +132,7 @@ pub struct AccountDBMut<'db> {
impl<'db> AccountDBMut<'db> {
/// Create a new AccountDB from an address.
#[cfg(test)]
pub fn new(db: &'db mut HashDB, address: &Address) -> Self {
Self::from_hash(db, address.sha3())
}
@ -143,7 +145,7 @@ impl<'db> AccountDBMut<'db> {
}
}
#[allow(dead_code)]
#[cfg(test)]
pub fn immutable(&'db self) -> AccountDB<'db> {
AccountDB { db: self.db, address_hash: self.address_hash.clone() }
}

3
ethcore/src/client/client.rs
View File

@ -166,8 +166,7 @@ impl Client {
db: Arc<KeyValueDB>,
miner: Arc<Miner>,
message_channel: IoChannel<ClientIoMessage>,
) -> Result<Arc<Client>, ClientError> {
) -> Result<Arc<Client>, ::error::Error> {
let trie_spec = match config.fat_db {
true => TrieSpec::Fat,
false => TrieSpec::Secure,

1
ethcore/src/ethereum/mod.rs
View File

@ -95,6 +95,7 @@ mod tests {
let engine = &spec.engine;
let genesis_header = spec.genesis_header();
let db = spec.ensure_db_good(get_temp_state_db(), &Default::default()).unwrap();
let s = State::from_existing(db, genesis_header.state_root().clone(), engine.account_start_nonce(), Default::default()).unwrap();
assert_eq!(s.balance(&"0000000000000000000000000000000000000001".into()).unwrap(), 1u64.into());
assert_eq!(s.balance(&"0000000000000000000000000000000000000002".into()).unwrap(), 1u64.into());

2
ethcore/src/json_tests/chain.rs
View File

@ -51,7 +51,7 @@ pub fn json_chain_test(json_data: &[u8], era: ChainEra) -> Vec<String> {
ChainEra::_Eip161 => ethereum::new_eip161_test(),
ChainEra::TransitionTest => ethereum::new_transition_test(),
};
spec.set_genesis_state(state);
spec.set_genesis_state(state).expect("Failed to overwrite genesis state");
spec.overwrite_genesis_params(genesis);
assert!(spec.is_state_root_valid());
spec

3
ethcore/src/pod_account.rs
View File

@ -16,7 +16,6 @@
use util::*;
use state::Account;
use account_db::AccountDBMut;
use ethjson;
use types::account_diff::*;
use rlp::{self, RlpStream};
@ -64,7 +63,7 @@ impl PodAccount {
}
/// Place additional data into given hash DB.
pub fn insert_additional(&self, db: &mut AccountDBMut, factory: &TrieFactory) {
pub fn insert_additional(&self, db: &mut HashDB, factory: &TrieFactory) {
match self.code {
Some(ref c) if !c.is_empty() => { db.insert(c); }
_ => {}

268
ethcore/src/spec/spec.rs
View File

@ -16,25 +16,27 @@
//! Parameters for a block chain.
use util::*;
use builtin::Builtin;
use engines::{Engine, NullEngine, InstantSeal, BasicAuthority, AuthorityRound, Tendermint};
use factory::Factories;
use executive::Executive;
use trace::{NoopTracer, NoopVMTracer};
use action_params::{ActionValue, ActionParams};
use types::executed::CallType;
use state::{Backend, State, Substate};
use env_info::EnvInfo;
use pod_state::*;
use account_db::*;
use header::{BlockNumber, Header};
use state_db::StateDB;
use super::genesis::Genesis;
use super::seal::Generic as GenericSeal;
use action_params::{ActionValue, ActionParams};
use builtin::Builtin;
use engines::{Engine, NullEngine, InstantSeal, BasicAuthority, AuthorityRound, Tendermint};
use env_info::EnvInfo;
use error::Error;
use ethereum;
use ethjson;
use executive::Executive;
use factory::Factories;
use header::{BlockNumber, Header};
use pod_state::*;
use rlp::{Rlp, RlpStream};
use state_db::StateDB;
use state::{Backend, State, Substate};
use state::backend::Basic as BasicBackend;
use trace::{NoopTracer, NoopVMTracer};
use types::executed::CallType;
use util::*;
/// Parameters common to all engines.
#[derive(Debug, PartialEq, Clone, Default)]
@ -119,39 +121,46 @@ pub struct Spec {
constructors: Vec<(Address, Bytes)>,
/// May be prepopulated if we know this in advance.
state_root_memo: RwLock<Option<H256>>,
state_root_memo: RwLock<H256>,
/// Genesis state as plain old data.
genesis_state: PodState,
}
impl From<ethjson::spec::Spec> for Spec {
fn from(s: ethjson::spec::Spec) -> Self {
let builtins = s.accounts.builtins().into_iter().map(|p| (p.0.into(), From::from(p.1))).collect();
let g = Genesis::from(s.genesis);
let GenericSeal(seal_rlp) = g.seal.into();
let params = CommonParams::from(s.params);
Spec {
name: s.name.clone().into(),
params: params.clone(),
engine: Spec::engine(s.engine, params, builtins),
data_dir: s.data_dir.unwrap_or(s.name).into(),
nodes: s.nodes.unwrap_or_else(Vec::new),
parent_hash: g.parent_hash,
transactions_root: g.transactions_root,
receipts_root: g.receipts_root,
author: g.author,
difficulty: g.difficulty,
gas_limit: g.gas_limit,
gas_used: g.gas_used,
timestamp: g.timestamp,
extra_data: g.extra_data,
seal_rlp: seal_rlp,
constructors: s.accounts.constructors().into_iter().map(|(a, c)| (a.into(), c.into())).collect(),
state_root_memo: RwLock::new(g.state_root),
genesis_state: From::from(s.accounts),
}
fn load_from(s: ethjson::spec::Spec) -> Result<Spec, Error> {
let builtins = s.accounts.builtins().into_iter().map(|p| (p.0.into(), From::from(p.1))).collect();
let g = Genesis::from(s.genesis);
let GenericSeal(seal_rlp) = g.seal.into();
let params = CommonParams::from(s.params);
let mut s = Spec {
name: s.name.clone().into(),
params: params.clone(),
engine: Spec::engine(s.engine, params, builtins),
data_dir: s.data_dir.unwrap_or(s.name).into(),
nodes: s.nodes.unwrap_or_else(Vec::new),
parent_hash: g.parent_hash,
transactions_root: g.transactions_root,
receipts_root: g.receipts_root,
author: g.author,
difficulty: g.difficulty,
gas_limit: g.gas_limit,
gas_used: g.gas_used,
timestamp: g.timestamp,
extra_data: g.extra_data,
seal_rlp: seal_rlp,
constructors: s.accounts.constructors().into_iter().map(|(a, c)| (a.into(), c.into())).collect(),
state_root_memo: RwLock::new(Default::default()), // will be overwritten right after.
genesis_state: s.accounts.into(),
};
// use memoized state root if provided.
match g.state_root {
Some(root) => *s.state_root_memo.get_mut() = root,
None => { let _ = s.run_constructors(&Default::default(), BasicBackend(MemoryDB::new()))?; },
}
Ok(s)
}
macro_rules! load_bundled {
@ -174,13 +183,93 @@ impl Spec {
}
}
// given a pre-constructor state, run all the given constructors and produce a new state and state root.
fn run_constructors<T: Backend>(&self, factories: &Factories, mut db: T) -> Result<T, Error> {
let mut root = SHA3_NULL_RLP;
// basic accounts in spec.
{
let mut t = factories.trie.create(db.as_hashdb_mut(), &mut root);
for (address, account) in self.genesis_state.get().iter() {
t.insert(&**address, &account.rlp())?;
}
}
for (address, account) in self.genesis_state.get().iter() {
db.note_non_null_account(address);
account.insert_additional(
&mut *factories.accountdb.create(db.as_hashdb_mut(), address.sha3()),
&factories.trie
);
}
let start_nonce = self.engine.account_start_nonce();
let (root, db) = {
let mut state = State::from_existing(
db,
root,
start_nonce,
factories.clone(),
)?;
// Execute contract constructors.
let env_info = EnvInfo {
number: 0,
author: self.author,
timestamp: self.timestamp,
difficulty: self.difficulty,
last_hashes: Default::default(),
gas_used: U256::zero(),
gas_limit: U256::max_value(),
};
let from = Address::default();
for &(ref address, ref constructor) in self.constructors.iter() {
trace!(target: "spec", "run_constructors: Creating a contract at {}.", address);
trace!(target: "spec", " .. root before = {}", state.root());
let params = ActionParams {
code_address: address.clone(),
code_hash: constructor.sha3(),
address: address.clone(),
sender: from.clone(),
origin: from.clone(),
gas: U256::max_value(),
gas_price: Default::default(),
value: ActionValue::Transfer(Default::default()),
code: Some(Arc::new(constructor.clone())),
data: None,
call_type: CallType::None,
};
let mut substate = Substate::new();
state.kill_account(&address);
{
let mut exec = Executive::new(&mut state, &env_info, self.engine.as_ref(), &factories.vm);
if let Err(e) = exec.create(params, &mut substate, &mut NoopTracer, &mut NoopVMTracer) {
warn!(target: "spec", "Genesis constructor execution at {} failed: {}.", address, e);
}
}
if let Err(e) = state.commit() {
warn!(target: "spec", "Genesis constructor trie commit at {} failed: {}.", address, e);
}
trace!(target: "spec", " .. root after = {}", state.root());
}
state.drop()
};
*self.state_root_memo.write() = root;
Ok(db)
}
/// Return the state root for the genesis state, memoising accordingly.
pub fn state_root(&self) -> H256 {
if self.state_root_memo.read().is_none() {
*self.state_root_memo.write() = Some(self.genesis_state.root());
}
self.state_root_memo.read().as_ref().cloned()
.expect("state root memo ensured to be set at this point; qed")
self.state_root_memo.read().clone()
}
/// Get the known knodes of the network in enode format.
@ -243,95 +332,46 @@ impl Spec {
self.timestamp = g.timestamp;
self.extra_data = g.extra_data;
self.seal_rlp = seal_rlp;
self.state_root_memo = RwLock::new(g.state_root);
}
/// Alter the value of the genesis state.
pub fn set_genesis_state(&mut self, s: PodState) {
pub fn set_genesis_state(&mut self, s: PodState) -> Result<(), Error> {
self.genesis_state = s;
*self.state_root_memo.write() = None;
let _ = self.run_constructors(&Default::default(), BasicBackend(MemoryDB::new()))?;
Ok(())
}
/// Returns `false` if the memoized state root is invalid. `true` otherwise.
pub fn is_state_root_valid(&self) -> bool {
self.state_root_memo.read().clone().map_or(true, |sr| sr == self.genesis_state.root())
// TODO: get rid of this function and ensure state root always is valid.
// we're mostly there, but `self.genesis_state.root()` doesn't encompass
// post-constructor state.
*self.state_root_memo.read() == self.genesis_state.root()
}
/// Ensure that the given state DB has the trie nodes in for the genesis state.
pub fn ensure_db_good(&self, mut db: StateDB, factories: &Factories) -> Result<StateDB, Box<TrieError>> {
pub fn ensure_db_good(&self, db: StateDB, factories: &Factories) -> Result<StateDB, Error> {
if db.as_hashdb().contains(&self.state_root()) {
return Ok(db)
}
trace!(target: "spec", "ensure_db_good: Fresh database? Cannot find state root {}", self.state_root());
let mut root = H256::new();
{
let mut t = factories.trie.create(db.as_hashdb_mut(), &mut root);
for (address, account) in self.genesis_state.get().iter() {
t.insert(&**address, &account.rlp())?;
}
}
// TODO: could optimize so we don't re-run, but `ensure_db_good` is barely ever
// called anyway.
let db = self.run_constructors(factories, db)?;
trace!(target: "spec", "ensure_db_good: Populated sec trie; root is {}", root);
for (address, account) in self.genesis_state.get().iter() {
db.note_non_null_account(address);
account.insert_additional(&mut AccountDBMut::new(db.as_hashdb_mut(), address), &factories.trie);
}
// Execute contract constructors.
let env_info = EnvInfo {
number: 0,
author: self.author,
timestamp: self.timestamp,
difficulty: self.difficulty,
last_hashes: Default::default(),
gas_used: U256::zero(),
gas_limit: U256::max_value(),
};
let from = Address::default();
let start_nonce = self.engine.account_start_nonce();
let mut state = State::from_existing(db, root, start_nonce, factories.clone())?;
// Mutate the state with each constructor.
for &(ref address, ref constructor) in self.constructors.iter() {
trace!(target: "spec", "ensure_db_good: Creating a contract at {}.", address);
let params = ActionParams {
code_address: address.clone(),
code_hash: constructor.sha3(),
address: address.clone(),
sender: from.clone(),
origin: from.clone(),
gas: U256::max_value(),
gas_price: Default::default(),
value: ActionValue::Transfer(Default::default()),
code: Some(Arc::new(constructor.clone())),
data: None,
call_type: CallType::None,
};
let mut substate = Substate::new();
state.kill_account(address);
{
let mut exec = Executive::new(&mut state, &env_info, self.engine.as_ref(), &factories.vm);
if let Err(e) = exec.create(params, &mut substate, &mut NoopTracer, &mut NoopVMTracer) {
warn!(target: "spec", "Genesis constructor execution at {} failed: {}.", address, e);
}
}
if let Err(e) = state.commit() {
warn!(target: "spec", "Genesis constructor trie commit at {} failed: {}.", address, e);
}
}
let (root, db) = state.drop();
*self.state_root_memo.write() = Some(root);
Ok(db)
}
/// Loads spec from json file.
/// Loads spec from json file. Provide factories for executing contracts and ensuring
/// storage goes to the right place.
pub fn load<R>(reader: R) -> Result<Self, String> where R: Read {
match ethjson::spec::Spec::load(reader) {
Ok(spec) => Ok(spec.into()),
Err(e) => Err(format!("Spec json is invalid: {}", e)),
fn fmt<F: ::std::fmt::Display>(f: F) -> String {
format!("Spec json is invalid: {}", f)
}
ethjson::spec::Spec::load(reader).map_err(fmt)
.and_then(|x| load_from(x).map_err(fmt))
}
/// Create a new Spec which conforms to the Frontier-era Morden chain except that it's a NullEngine consensus.

33
ethcore/src/state/backend.rs
View File

@ -206,7 +206,8 @@ impl<H: AsHashDB> Proving<H> {
}
}
/// Consume the backend, extracting the gathered proof.
/// Consume the backend, extracting the gathered proof in lexicographical order
/// by value.
pub fn extract_proof(self) -> Vec<DBValue> {
self.proof.into_inner().into_iter().collect()
}
@ -221,3 +222,33 @@ impl<H: AsHashDB + Clone> Clone for Proving<H> {
}
}
}
/// A basic backend. Just wraps the given database, directly inserting into and deleting from
/// it. Doesn't cache anything.
pub struct Basic<H>(pub H);
impl<H: AsHashDB + Send + Sync> Backend for Basic<H> {
fn as_hashdb(&self) -> &HashDB {
self.0.as_hashdb()
}
fn as_hashdb_mut(&mut self) -> &mut HashDB {
self.0.as_hashdb_mut()
}
fn add_to_account_cache(&mut self, _: Address, _: Option<Account>, _: bool) { }
fn cache_code(&self, _: H256, _: Arc<Vec<u8>>) { }
fn get_cached_account(&self, _: &Address) -> Option<Option<Account>> { None }
fn get_cached<F, U>(&self, _: &Address, _: F) -> Option<U>
where F: FnOnce(Option<&mut Account>) -> U
{
None
}
fn get_cached_code(&self, _: &H256) -> Option<Arc<Vec<u8>>> { None }
fn note_non_null_account(&self, _: &Address) { }
fn is_known_null(&self, _: &Address) -> bool { false }
}

3
ethcore/src/state_db.rs
View File

@ -448,7 +448,8 @@ impl state::Backend for StateDB {
fn is_known_null(&self, address: &Address) -> bool {
trace!(target: "account_bloom", "Check account bloom: {:?}", address);
let bloom = self.account_bloom.lock();
!bloom.check(&*address.sha3())
let is_null = !bloom.check(&*address.sha3());
is_null
}
}

2
rpc/src/v1/tests/eth.rs
View File

@ -83,7 +83,7 @@ fn make_spec(chain: &BlockChain) -> Spec {
let genesis = Genesis::from(chain.genesis());
let mut spec = ethereum::new_frontier_test();
let state = chain.pre_state.clone().into();
spec.set_genesis_state(state);
spec.set_genesis_state(state).expect("unable to set genesis state");
spec.overwrite_genesis_params(genesis);
assert!(spec.is_state_root_valid());
spec