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use pyo3::prelude::*;
use pyo3::types::PyTuple;
use std::fs::File;
use std::io::prelude::*;
pub const MODEL_FEE_NUMERATOR: u64 = 10000000;
pub const MODEL_FEE_DENOMINATOR: u64 = 10000000000;
const DEFAULT_POOL_TOKENS: u64 = 0;
const DEFAULT_TARGET_PRICE: u128 = 1000000000000000000;
const FILE_NAME: &str = "simulation.py";
const FILE_PATH: &str = "sim/simulation.py";
const MODULE_NAME: &str = "simulation";
pub struct Model {
pub py_src: String,
pub amp_factor: u64,
pub balances: Vec<u64>,
pub n_coins: u8,
pub target_prices: Vec<u128>,
pub pool_tokens: u64,
}
impl Model {
pub fn new(amp_factor: u64, balances: Vec<u64>, n_coins: u8) -> Model {
let src_file = File::open(FILE_PATH);
let mut src_file = match src_file {
Ok(file) => file,
Err(error) => {
panic!("{:?}\n Please run `curl -L
https://raw.githubusercontent.com/curvefi/curve-contract/master/tests/simulation.py > sim/simulation.py`", error)
}
};
let mut src_content = String::new();
let _ = src_file.read_to_string(&mut src_content);
Self {
py_src: src_content,
amp_factor,
balances,
n_coins,
target_prices: vec![DEFAULT_TARGET_PRICE, DEFAULT_TARGET_PRICE],
pool_tokens: DEFAULT_POOL_TOKENS,
}
}
pub fn new_with_pool_tokens(
amp_factor: u64,
balances: Vec<u64>,
n_coins: u8,
pool_token_amount: u64,
) -> Model {
let src_file = File::open(FILE_PATH);
let mut src_file = match src_file {
Ok(file) => file,
Err(error) => {
panic!("{:?}\n Please run `curl -L
https://raw.githubusercontent.com/curvefi/curve-contract/master/tests/simulation.py > sim/simulation.py`", error)
}
};
let mut src_content = String::new();
let _ = src_file.read_to_string(&mut src_content);
Self {
py_src: src_content,
amp_factor,
balances,
n_coins,
target_prices: vec![DEFAULT_TARGET_PRICE, DEFAULT_TARGET_PRICE],
pool_tokens: pool_token_amount,
}
}
pub fn sim_d(&self) -> u128 {
let gil = Python::acquire_gil();
return self
.call0(gil.python(), "D")
.unwrap()
.extract(gil.python())
.unwrap();
}
pub fn sim_dy(&self, i: u128, j: u128, dx: u128) -> u128 {
let gil = Python::acquire_gil();
return self
.call1(gil.python(), "dy", (i, j, dx))
.unwrap()
.extract(gil.python())
.unwrap();
}
pub fn sim_exchange(&self, i: u128, j: u128, dx: u128) -> u64 {
let gil = Python::acquire_gil();
return self
.call1(gil.python(), "exchange", (i, j, dx))
.unwrap()
.extract(gil.python())
.unwrap();
}
pub fn sim_xp(&self) -> Vec<u128> {
let gil = Python::acquire_gil();
return self
.call0(gil.python(), "xp")
.unwrap()
.extract(gil.python())
.unwrap();
}
pub fn sim_y(&self, i: u128, j: u128, x: u64) -> u128 {
let gil = Python::acquire_gil();
return self
.call1(gil.python(), "y", (i, j, x))
.unwrap()
.extract(gil.python())
.unwrap();
}
pub fn sim_y_d(&self, i: u128, d: u128) -> u128 {
let gil = Python::acquire_gil();
return self
.call1(gil.python(), "y_D", (i, d))
.unwrap()
.extract(gil.python())
.unwrap();
}
pub fn sim_remove_liquidity_imbalance(&self, amounts: Vec<u128>) -> u128 {
let gil = Python::acquire_gil();
return self
.call1(
gil.python(),
"remove_liquidity_imbalance",
PyTuple::new(gil.python(), amounts.to_vec()),
)
.unwrap()
.extract(gil.python())
.unwrap();
}
pub fn sim_calc_withdraw_one_coin(&self, token_amount: u64, i: u128) -> (u64, u64) {
let gil = Python::acquire_gil();
return self
.call1(gil.python(), "calc_withdraw_one_coin", (token_amount, i))
.unwrap()
.extract(gil.python())
.unwrap();
}
fn call0(&self, py: Python, method_name: &str) -> Result<PyObject, PyErr> {
let sim = PyModule::from_code(py, &self.py_src, FILE_NAME, MODULE_NAME).unwrap();
let model = sim
.getattr("Curve")?
.call1((
self.amp_factor,
self.balances.to_vec(),
self.n_coins,
self.target_prices.to_vec(),
self.pool_tokens,
))
.unwrap()
.to_object(py);
let py_ret = model.as_ref(py).call_method0(method_name);
self.extract_py_ret(py, py_ret)
}
fn call1(
&self,
py: Python,
method_name: &str,
args: impl IntoPy<Py<PyTuple>>,
) -> Result<PyObject, PyErr> {
let sim = PyModule::from_code(py, &self.py_src, FILE_NAME, MODULE_NAME).unwrap();
let model = sim
.getattr("Curve")?
.call1((
self.amp_factor,
self.balances.to_vec(),
self.n_coins,
self.target_prices.to_vec(),
self.pool_tokens,
))
.unwrap()
.to_object(py);
let py_ret = model.as_ref(py).call_method1(method_name, args);
self.extract_py_ret(py, py_ret)
}
fn extract_py_ret(&self, py: Python, ret: PyResult<&PyAny>) -> Result<PyObject, PyErr> {
match ret {
Ok(v) => v.extract(),
Err(e) => {
e.print_and_set_sys_last_vars(py);
panic!("Python exeuction failed.")
}
}
}
pub fn print_src(&self) {
println!("{}", self.py_src);
}
}
