43 lines
1.6 KiB
Rust
43 lines
1.6 KiB
Rust
// Copyright 2015-2020 Parity Technologies (UK) Ltd.
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// This file is part of OpenEthereum.
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// OpenEthereum 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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// OpenEthereum 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 OpenEthereum. If not, see <http://www.gnu.org/licenses/>.
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//! Generalization of a state machine for a consensus engine.
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//! This will define traits for the header, block, and state of a blockchain.
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use block::ExecutedBlock;
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use ethereum_types::{Address, U256};
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/// Generalization of types surrounding blockchain-suitable state machines.
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pub trait Machine: Send + Sync {
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/// A handle to a blockchain client for this machine.
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type EngineClient: ?Sized;
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/// Errors which can occur when querying or interacting with the machine.
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type Error;
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/// Get the balance, in base units, associated with an account.
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/// Extracts data from the live block.
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fn balance(&self, live: &ExecutedBlock, address: &Address) -> Result<U256, Self::Error>;
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/// Increment the balance of an account in the state of the live block.
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fn add_balance(
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&self,
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live: &mut ExecutedBlock,
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address: &Address,
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amount: &U256,
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) -> Result<(), Self::Error>;
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}
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