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ethcore/src/state/substate.rs

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+// Copyright 2015, 2016 Ethcore (UK) Ltd.
+// 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/>.
+
+//! Execution environment substate.
+use std::collections::HashSet;
+use util::{Address, U256};
+use log_entry::LogEntry;
+
+/// State changes which should be applied in finalize,
+/// after transaction is fully executed.
+#[derive(Debug, Default)]
+pub struct Substate {
+	/// Any accounts that have suicided.
+	pub suicides: HashSet<Address>,
+
+	/// Any logs.
+	pub logs: Vec<LogEntry>,
+
+	/// Refund counter of SSTORE nonzero -> zero.
+	pub sstore_clears_count: U256,
+
+	/// Created contracts.
+	pub contracts_created: Vec<Address>,
+}
+
+impl Substate {
+	/// Creates new substate.
+	pub fn new() -> Self {
+		Substate::default()
+	}
+
+	/// Merge secondary substate `s` into self, accruing each element correspondingly.
+	pub fn accrue(&mut self, s: Substate) {
+		self.suicides.extend(s.suicides.into_iter());
+		self.logs.extend(s.logs.into_iter());
+		self.sstore_clears_count = self.sstore_clears_count + s.sstore_clears_count;
+		self.contracts_created.extend(s.contracts_created.into_iter());
+	}
+}
+
+#[cfg(test)]
+mod tests {
+	use super::Substate;
+	use log_entry::LogEntry;
+
+	#[test]
+	fn created() {
+		let sub_state = Substate::new();
+		assert_eq!(sub_state.suicides.len(), 0);
+	}
+
+	#[test]
+	fn accrue() {
+		let mut sub_state = Substate::new();
+		sub_state.contracts_created.push(1u64.into());
+		sub_state.logs.push(LogEntry {
+			address: 1u64.into(),
+			topics: vec![],
+			data: vec![]
+		});
+		sub_state.sstore_clears_count = 5.into();
+		sub_state.suicides.insert(10u64.into());
+
+		let mut sub_state_2 = Substate::new();
+		sub_state_2.contracts_created.push(2u64.into());
+		sub_state_2.logs.push(LogEntry {
+			address: 1u64.into(),
+			topics: vec![],
+			data: vec![]
+		});
+		sub_state_2.sstore_clears_count = 7.into();
+
+		sub_state.accrue(sub_state_2);
+		assert_eq!(sub_state.contracts_created.len(), 2);
+		assert_eq!(sub_state.sstore_clears_count, 12.into());
+		assert_eq!(sub_state.suicides.len(), 1);
+	}
+}