example_my_evm/
handler.rs

1use revm::{
2    context::result::{EVMError, HaltReason, InvalidTransaction},
3    context_interface::{ContextTr, JournalTr},
4    handler::{
5        evm::FrameTr, instructions::InstructionProvider, EvmTr, FrameResult, Handler,
6        PrecompileProvider,
7    },
8    inspector::{Inspector, InspectorEvmTr, InspectorHandler},
9    interpreter::{interpreter::EthInterpreter, interpreter_action::FrameInit, InterpreterResult},
10    state::EvmState,
11    Database,
12};
13
14/// Custom handler for MyEvm that defines transaction execution behavior.
15///
16/// This handler demonstrates how to customize EVM execution by implementing
17/// the Handler trait. It can be extended to add custom validation, modify
18/// gas calculations, or implement protocol-specific behavior while maintaining
19/// compatibility with the standard EVM execution flow.
20#[derive(Debug)]
21pub struct MyHandler<EVM> {
22    /// Phantom data to maintain the EVM type parameter.
23    /// This field exists solely to satisfy Rust's type system requirements
24    /// for generic parameters that aren't directly used in the struct fields.
25    pub _phantom: core::marker::PhantomData<EVM>,
26}
27
28impl<EVM> Default for MyHandler<EVM> {
29    fn default() -> Self {
30        Self {
31            _phantom: core::marker::PhantomData,
32        }
33    }
34}
35
36impl<EVM> Handler for MyHandler<EVM>
37where
38    EVM: EvmTr<
39        Context: ContextTr<Journal: JournalTr<State = EvmState>>,
40        Precompiles: PrecompileProvider<EVM::Context, Output = InterpreterResult>,
41        Instructions: InstructionProvider<
42            Context = EVM::Context,
43            InterpreterTypes = EthInterpreter,
44        >,
45        Frame: FrameTr<FrameResult = FrameResult, FrameInit = FrameInit>,
46    >,
47{
48    type Evm = EVM;
49    type Error = EVMError<<<EVM::Context as ContextTr>::Db as Database>::Error, InvalidTransaction>;
50    type HaltReason = HaltReason;
51
52    fn reward_beneficiary(
53        &self,
54        _evm: &mut Self::Evm,
55        _exec_result: &mut FrameResult,
56    ) -> Result<(), Self::Error> {
57        // Skip beneficiary reward
58        Ok(())
59    }
60}
61
62impl<EVM> InspectorHandler for MyHandler<EVM>
63where
64    EVM: InspectorEvmTr<
65        Inspector: Inspector<<<Self as Handler>::Evm as EvmTr>::Context, EthInterpreter>,
66        Context: ContextTr<Journal: JournalTr<State = EvmState>>,
67        Precompiles: PrecompileProvider<EVM::Context, Output = InterpreterResult>,
68        Instructions: InstructionProvider<
69            Context = EVM::Context,
70            InterpreterTypes = EthInterpreter,
71        >,
72    >,
73{
74    type IT = EthInterpreter;
75}
example_my_evm/handler.rs

example_my_evm/
handler.rs
