30 lines
852 B
Rust
30 lines
852 B
Rust
//! Evm interface.
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use util::uint::U256;
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use evm::{EvmParams, Ext};
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/// Evm errors.
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#[derive(Debug)]
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pub enum EvmError {
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/// `OutOfGas` is returned when transaction execution runs out of gas.
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/// The state should be reverted to the state from before the
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/// transaction execution. But it does not mean that transaction
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/// was invalid. Balance still should be transfered and nonce
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/// should be increased.
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OutOfGas,
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/// Returned on evm internal error. Should never be ignored during development.
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/// Likely to cause consensus issues.
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Internal,
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}
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/// Evm result.
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///
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/// Returns gas_left if execution is successfull, otherwise error.
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pub type EvmResult = Result<U256, EvmError>;
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/// Evm interface.
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pub trait Evm {
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/// This function should be used to execute transaction.
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fn exec(&self, params: &EvmParams, ext: &mut Ext) -> EvmResult;
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}
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