openethereum/ethcore/src/pod_state.rs

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// Copyright 2015-2017 Parity Technologies (UK) Ltd.
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// This file is part of Parity.
// Parity is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// Parity is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with Parity. If not, see <http://www.gnu.org/licenses/>.
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//! State of all accounts in the system expressed in Plain Old Data.
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use std::fmt;
use std::collections::BTreeMap;
use itertools::Itertools;
use util::*;
use pod_account::{self, PodAccount};
use types::state_diff::StateDiff;
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use ethjson;
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/// State of all accounts in the system expressed in Plain Old Data.
#[derive(Debug, Clone, PartialEq, Eq, Default)]
pub struct PodState (BTreeMap<Address, PodAccount>);
impl PodState {
/// Contruct a new object from the `m`.
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pub fn new() -> PodState { Default::default() }
/// Contruct a new object from the `m`.
pub fn from(m: BTreeMap<Address, PodAccount>) -> PodState { PodState(m) }
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/// Get the underlying map.
pub fn get(&self) -> &BTreeMap<Address, PodAccount> { &self.0 }
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/// Get the root hash of the trie of the RLP of this.
pub fn root(&self) -> H256 {
sec_trie_root(self.0.iter().map(|(k, v)| (k.to_vec(), v.rlp())).collect())
}
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/// Drain object to get the underlying map.
pub fn drain(self) -> BTreeMap<Address, PodAccount> { self.0 }
}
impl From<ethjson::blockchain::State> for PodState {
fn from(s: ethjson::blockchain::State) -> PodState {
let state = s.into_iter().map(|(addr, acc)| (addr.into(), PodAccount::from(acc))).collect();
PodState(state)
}
}
impl From<ethjson::spec::State> for PodState {
fn from(s: ethjson::spec::State) -> PodState {
let state: BTreeMap<_,_> = s.into_iter()
.filter(|pair| !pair.1.is_empty())
.map(|(addr, acc)| (addr.into(), PodAccount::from(acc)))
.collect();
PodState(state)
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}
}
impl fmt::Display for PodState {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
for (add, acc) in &self.0 {
writeln!(f, "{} => {}", add, acc)?;
}
Ok(())
}
}
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/// Calculate and return diff between `pre` state and `post` state.
pub fn diff_pod(pre: &PodState, post: &PodState) -> StateDiff {
StateDiff { raw: pre.get().keys().merge(post.get().keys()).filter_map(|acc| pod_account::diff_pod(pre.get().get(acc), post.get().get(acc)).map(|d|(acc.clone(), d))).collect() }
}
#[cfg(test)]
mod test {
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use std::collections::BTreeMap;
use types::state_diff::*;
use types::account_diff::*;
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use pod_account::PodAccount;
use super::PodState;
#[test]
fn create_delete() {
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let a = PodState::from(map![ 1.into() => PodAccount::new(69.into(), 0.into(), vec![], map![]) ]);
assert_eq!(super::diff_pod(&a, &PodState::new()), StateDiff { raw: map![
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1.into() => AccountDiff{
balance: Diff::Died(69.into()),
nonce: Diff::Died(0.into()),
code: Diff::Died(vec![]),
storage: map![],
}
]});
assert_eq!(super::diff_pod(&PodState::new(), &a), StateDiff{ raw: map![
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1.into() => AccountDiff{
balance: Diff::Born(69.into()),
nonce: Diff::Born(0.into()),
code: Diff::Born(vec![]),
storage: map![],
}
]});
}
#[test]
fn create_delete_with_unchanged() {
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let a = PodState::from(map![ 1.into() => PodAccount::new(69.into(), 0.into(), vec![], map![]) ]);
let b = PodState::from(map![
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1.into() => PodAccount::new(69.into(), 0.into(), vec![], map![]),
2.into() => PodAccount::new(69.into(), 0.into(), vec![], map![])
]);
assert_eq!(super::diff_pod(&a, &b), StateDiff { raw: map![
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2.into() => AccountDiff{
balance: Diff::Born(69.into()),
nonce: Diff::Born(0.into()),
code: Diff::Born(vec![]),
storage: map![],
}
]});
assert_eq!(super::diff_pod(&b, &a), StateDiff { raw: map![
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2.into() => AccountDiff{
balance: Diff::Died(69.into()),
nonce: Diff::Died(0.into()),
code: Diff::Died(vec![]),
storage: map![],
}
]});
}
#[test]
fn change_with_unchanged() {
let a = PodState::from(map![
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1.into() => PodAccount::new(69.into(), 0.into(), vec![], map![]),
2.into() => PodAccount::new(69.into(), 0.into(), vec![], map![])
]);
let b = PodState::from(map![
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1.into() => PodAccount::new(69.into(), 1.into(), vec![], map![]),
2.into() => PodAccount::new(69.into(), 0.into(), vec![], map![])
]);
assert_eq!(super::diff_pod(&a, &b), StateDiff { raw: map![
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1.into() => AccountDiff{
balance: Diff::Same,
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nonce: Diff::Changed(0.into(), 1.into()),
code: Diff::Same,
storage: map![],
}
]});
}
}