127 lines
3.6 KiB
Rust
127 lines
3.6 KiB
Rust
// Copyright 2015, 2016 Ethcore (UK) Ltd.
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// This file is part of Parity.
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// Parity is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// Parity is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with Parity. If not, see <http://www.gnu.org/licenses/>.
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use util::*;
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#[cfg(test)]
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use pod_state::*;
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use account_diff::*;
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#[derive(Debug,Clone,PartialEq,Eq)]
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/// Expression for the delta between two system states. Encoded the
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/// delta of every altered account.
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pub struct StateDiff (BTreeMap<Address, AccountDiff>);
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impl StateDiff {
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#[cfg(test)]
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/// Calculate and return diff between `pre` state and `post` state.
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pub fn diff_pod(pre: &PodState, post: &PodState) -> StateDiff {
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StateDiff(pre.get().keys().merge(post.get().keys()).filter_map(|acc| AccountDiff::diff_pod(pre.get().get(acc), post.get().get(acc)).map(|d|(acc.clone(), d))).collect())
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}
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}
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impl fmt::Display for StateDiff {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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for (add, acc) in &self.0 {
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try!(write!(f, "{} {}: {}", acc.existance(), add, acc));
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}
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Ok(())
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}
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}
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impl Deref for StateDiff {
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type Target = BTreeMap<Address, AccountDiff>;
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fn deref(&self) -> &Self::Target {
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&self.0
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}
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}
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#[cfg(test)]
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mod test {
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use common::*;
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use pod_state::*;
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use account_diff::*;
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use pod_account::*;
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use super::*;
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#[test]
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fn create_delete() {
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let a = PodState::from(map![ 1.into() => PodAccount::new(69.into(), 0.into(), vec![], map![]) ]);
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assert_eq!(StateDiff::diff_pod(&a, &PodState::new()), StateDiff(map![
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1.into() => AccountDiff{
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balance: Diff::Died(69.into()),
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nonce: Diff::Died(0.into()),
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code: Diff::Died(vec![]),
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storage: map![],
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}
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]));
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assert_eq!(StateDiff::diff_pod(&PodState::new(), &a), StateDiff(map![
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1.into() => AccountDiff{
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balance: Diff::Born(69.into()),
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nonce: Diff::Born(0.into()),
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code: Diff::Born(vec![]),
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storage: map![],
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}
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]));
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}
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#[test]
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fn create_delete_with_unchanged() {
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let a = PodState::from(map![ 1.into() => PodAccount::new(69.into(), 0.into(), vec![], map![]) ]);
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let b = PodState::from(map![
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1.into() => PodAccount::new(69.into(), 0.into(), vec![], map![]),
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2.into() => PodAccount::new(69.into(), 0.into(), vec![], map![])
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]);
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assert_eq!(StateDiff::diff_pod(&a, &b), StateDiff(map![
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2.into() => AccountDiff{
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balance: Diff::Born(69.into()),
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nonce: Diff::Born(0.into()),
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code: Diff::Born(vec![]),
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storage: map![],
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}
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]));
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assert_eq!(StateDiff::diff_pod(&b, &a), StateDiff(map![
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2.into() => AccountDiff{
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balance: Diff::Died(69.into()),
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nonce: Diff::Died(0.into()),
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code: Diff::Died(vec![]),
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storage: map![],
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}
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]));
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}
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#[test]
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fn change_with_unchanged() {
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let a = PodState::from(map![
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1.into() => PodAccount::new(69.into(), 0.into(), vec![], map![]),
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2.into() => PodAccount::new(69.into(), 0.into(), vec![], map![])
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]);
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let b = PodState::from(map![
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1.into() => PodAccount::new(69.into(), 1.into(), vec![], map![]),
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2.into() => PodAccount::new(69.into(), 0.into(), vec![], map![])
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]);
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assert_eq!(StateDiff::diff_pod(&a, &b), StateDiff(map![
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1.into() => AccountDiff{
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balance: Diff::Same,
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nonce: Diff::Changed(0.into(), 1.into()),
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code: Diff::Same,
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storage: map![],
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}
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]));
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}
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}
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