16 unstable releases (4 breaking)
0.5.0 | Apr 7, 2024 |
---|---|
0.4.2 | Oct 26, 2023 |
0.3.4 | Dec 16, 2022 |
0.3.2 | Jul 29, 2022 |
0.1.6 | Jun 4, 2019 |
#6 in #cita
260KB
6K
SLoC
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
Let us begin with the most basic example. First, we initialize a database in memory:
let db = Arc::new(cita_vm::state::MemoryDB::new(false));
And, wrap this db as a WorldState
let mut state = cita_vm::state::State::new(db).unwrap();
Create some accounts in WorldState
, one of them stores the SimpleStorage code.
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)
let block_data_provider: Arc<cita_vm::BlockDataProvider> =
Arc::new(cita_vm::BlockDataProviderMock::default());
let state_data_provider = Arc::new(RefCell::new(state));
let context = cita_vm::evm::Context::default();
let config = cita_vm::Config {
block_gas_limit: 8000000,
};
let tx = cita_vm::Transaction {
from: Address::from_str("0x1000000000000000000000000000000000000000").unwrap(),
to: Some(Address::from("0xBd770416a3345F91E4B34576cb804a576fa48EB1")),
value: U256::from(0),
nonce: U256::from(1),
gas_limit: 80000,
gas_price: U256::from(1),
input: hex::decode(
"60fe47b1000000000000000000000000000000000000000000000000000000000000002a",
)
.unwrap(),
};
let r = cita_vm::exec(
block_data_provider.clone(),
state_data_provider.clone(),
context.clone(),
config.clone(),
tx,
)
.unwrap();
Send a transaction to call SimpleStorage.get()
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
$ make testdata
$ cargo test
Licences
Apache License 2.0
Dependencies
~9–17MB
~205K SLoC