cita-vm

Fast EVM implementation for CITA. Tuned for high performance, up to 5x faster than parity. Based entirely on the Ethereum Yellow Paper(Version: 2d0661f 2018-11-08).

[dependencies] cita-vm = "0.3.3"

• Example
• Performance comparison with parity and geth
• Tests
• Licences

Example

Let us begin with the most basic example. First, we initialize a database in memory:

rs let db = Arc::new(cita_vm::state::MemoryDB::new(false));

And, wrap this db as a WorldState

rs let mut state = cita_vm::state::State::new(db).unwrap();

Create some accounts in WorldState, one of them stores the SimpleStorage code.

rs let code = "6080604052600436106049576000357c0100000000000000000000000000000\ 000000000000000000000000000900463ffffffff16806360fe47b114604e57\ 80636d4ce63c146078575b600080fd5b348015605957600080fd5b506076600\ 4803603810190808035906020019092919050505060a0565b005b3480156083\ 57600080fd5b50608a60aa565b6040518082815260200191505060405180910\ 390f35b8060008190555050565b600080549050905600a165627a7a72305820\ 99c66a25d59f0aa78f7ebc40748fa1d1fbc335d8d780f284841b30e0365acd9\ 60029"; state.new_contract( &Address::from_str("0xBd770416a3345F91E4B34576cb804a576fa48EB1").unwrap(), U256::from(10), U256::from(1), hex::decode(code).unwrap(), ); state.new_contract( &Address::from_str("0x1000000000000000000000000000000000000000").unwrap(), U256::from(1000000000000000u64), U256::from(1), vec![], );

Send a transaction to call SimpleStorage.set(42)

```rs let blockdataprovider: Arc = Arc::new(citavm::BlockDataProviderMock::default()); let statedataprovider = Arc::new(RefCell::new(state)); let context = citavm::evm::Context::default(); let config = citavm::Config { blockgas_limit: 8000000, };

let tx = citavm::Transaction { from: Address::fromstr("0x1000000000000000000000000000000000000000").unwrap(), to: Some(Address::from("0xBd770416a3345F91E4B34576cb804a576fa48EB1")), value: U256::from(0), nonce: U256::from(1), gaslimit: 80000, gasprice: U256::from(1), input: hex::decode( "60fe47b1000000000000000000000000000000000000000000000000000000000000002a", ) .unwrap(), }; let r = citavm::exec( blockdataprovider.clone(), statedata_provider.clone(), context.clone(), config.clone(), tx, ) .unwrap(); ```

Send a transaction to call SimpleStorage.get()

rs let tx = cita_vm::Transaction { from: Address::from_str("0x1000000000000000000000000000000000000000").unwrap(), to: Some(Address::from_str("0xBd770416a3345F91E4B34576cb804a576fa48EB1").unwrap()), value: U256::from(0), nonce: U256::from(2), gas_limit: 80000, gas_price: U256::from(1), input: hex::decode("6d4ce63c").unwrap(), }; let r = cita_vm::exec( block_data_provider.clone(), state_data_provider.clone(), context.clone(), config.clone(), tx, ) .unwrap(); println!("return={:?}", r); // 42 is outputed

Full code could be found here. You could run it by

$ cargo run --example simplestorage

Performance comparison with parity and geth

In short, cita-vm is the fastest EVM. Below are benchmark results on Intel(R) Xeon(R) CPU E5-26xx v3.

Tests

sh $ make testdata $ cargo test

Licences

Apache License 2.0