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//! Seahorse Pyth includes builtin types and functions for working with the Pyth price oracle.
// why does every builtin have to start with a P
use std::collections::BTreeMap;
use crate::core::compile::builtin::*;
pub use crate::core::{
compile::{ast::*, build::*, check::*, namespace::*, sign::*},
util::*,
};
use crate::data::get_pyth_price_address;
use crate::match1;
use base58::FromBase58;
use quote::quote;
use regex::Regex;
#[derive(Clone, Debug, PartialEq)]
pub enum Pyth {
// Types
PriceAccount,
PriceFeed,
Price,
}
/// Create the seahorse.pyth namespace.
pub fn namespace() -> Namespace {
let data = [
("PriceAccount", Pyth::PriceAccount),
("PriceFeed", Pyth::PriceFeed),
("Price", Pyth::Price),
];
let mut namespace = BTreeMap::new();
for (name, obj) in data.into_iter() {
namespace.insert(
name.to_string(),
NamespacedObject::Item(Item::Builtin(Builtin::Pyth(obj))),
);
}
return namespace;
}
impl BuiltinSource for Pyth {
fn name(&self) -> String {
match self {
Self::PriceAccount => "PriceAccount",
Self::PriceFeed => "PriceFeed",
Self::Price => "Price",
}
.to_string()
}
fn ty(&self) -> Ty {
match self {
Self::PriceAccount | Self::PriceFeed | Self::Price => {
Ty::Type(TyName::Builtin(Builtin::Pyth(self.clone())), None)
}
}
}
fn as_instance(&self, params: &Vec<Ty>) -> CResult<()> {
match self {
_ if params.len() == 0 => Ok(()),
_ => Err(CoreError::make_raw("invalid type", "")),
}
}
fn attr(&self, attr: &String) -> Option<(Ty, Ty)> {
let ty_no_params = Ty::pyth(self.clone(), vec![]);
match (self, attr.as_str()) {
// Price.validate_price_feed(str) -> PriceFeed
(Self::PriceAccount, "validate_price_feed") => Some((
ty_no_params,
Ty::new_function(
vec![(
"product",
Ty::python(Python::Str, vec![]),
ParamType::Required,
)],
Ty::Transformed(
Ty::pyth(Self::PriceFeed, vec![]).into(),
Transformation::new_with_context(
|mut expr, _| {
let (function, product) = match1!(expr.obj, ExpressionObj::Call { function, args } => (*function, args.into_iter().next().unwrap()));
let price = match1!(function.obj, ExpressionObj::Attribute { value, .. } => *value);
let product = if let ExpressionObj::Literal(Literal::Str(product)) =
product.obj
{
product
} else {
return Err(CoreError::make_raw(
"Price.validate() requires a string literal",
"",
));
};
let product_re =
Regex::new(r"^((mainnet|devnet|testnet)-)?\w+/\w+$").unwrap();
let caps = product_re
.captures(&product)
.ok_or(CoreError::make_raw(
"invalid Pyth product string",
concat!(
"Help: Pyth product strings must have the format\n\n",
" [cluster-]BASE/QUOTE\n\n",
"(where brackets means optional, defaulting to mainnet). For example, the following are all valid:\n\n",
" SOL/USD\n",
" mainnet-SOL/USD\n",
" devnet-AAPL/USD\n",
" testnet-USD/JPY"
)
))?;
let product = match caps.get(1) {
Some(_) => product,
None => format!("mainnet-{}", product.as_str()),
};
let key = get_pyth_price_address(&product)
.ok_or(CoreError::make_raw(
"could not find price account for product",
"",
))?
.from_base58()
.unwrap();
let msg = format!(
"Pyth PriceAccount validation failed: expected {}",
product
);
expr.obj = ExpressionObj::Rendered(quote! {
{
if #price.key() != Pubkey::new_from_array([#(#key),*]) {
panic!(#msg)
}
load_price_feed_from_account_info(&#price).unwrap()
}
});
Ok(Transformed::Expression(expr))
},
// Seed context is added to prevent the string literal from expanding into
// a call to .to_string()
Some(ExprContext::Seed),
),
),
),
)),
// PriceFeed.get_price() -> Price
(Self::PriceFeed, "get_price") => Some((
ty_no_params,
Ty::new_function(
vec![],
Ty::Transformed(
Ty::pyth(Self::Price, vec![]).into(),
Transformation::new(|mut expr| {
let function = match1!(expr.obj, ExpressionObj::Call { function, .. } => *function);
let price = match1!(function.obj, ExpressionObj::Attribute { value, .. } => *value);
expr.obj = ExpressionObj::Rendered(quote! {
#price.get_price_unchecked()
});
Ok(Transformed::Expression(expr))
}),
),
),
)),
// Price.price: i64
(Self::Price, "price") => Some((
ty_no_params,
Ty::prelude(Prelude::RustInt(true, 64), vec![]),
)),
// Price.conf: u64
(Self::Price, "conf") => Some((
ty_no_params,
Ty::prelude(Prelude::RustInt(false, 64), vec![]),
)),
// Price.expo: i32
(Self::Price, "expo") => Some((
ty_no_params,
Ty::prelude(Prelude::RustInt(true, 32), vec![]),
)),
// Price.publish_time: i64
(Self::Price, "publish_time") => Some((
ty_no_params,
Ty::prelude(Prelude::RustInt(true, 64), vec![]),
)),
// Price.num() -> f64
(Self::Price, "num") => Some((
ty_no_params,
Ty::new_function(
vec![],
Ty::Transformed(
Ty::prelude(Prelude::RustFloat, vec![]).into(),
Transformation::new(|mut expr| {
// TODO this "extract caller and args" pattern is used a lot, should turn into a function
let function = match1!(expr.obj, ExpressionObj::Call { function, .. } => *function);
let price = match1!(function.obj, ExpressionObj::Attribute { value, .. } => *value);
expr.obj = ExpressionObj::Rendered(quote! {
{
let price = #price;
(price.price as f64) * 10f64.powf(price.expo as f64)
}
});
Ok(Transformed::Expression(expr))
}),
),
),
)),
_ => None,
}
}
fn index(&self) -> Option<(Ty, Ty)> {
None
}
fn static_attr(&self, _attr: &String) -> Option<Ty> {
None
}
fn casted(&self, ty: &Ty) -> Option<(Ty, Ty)> {
let builtin = if let Ty::Generic(TyName::Builtin(builtin), _) = ty {
builtin
} else {
return None;
};
match self {
Self::PriceAccount => match builtin {
Builtin::Prelude(Prelude::Account | Prelude::InitAccount) => {
Some((Ty::pyth(self.clone(), vec![]), ty.clone()))
}
Builtin::Prelude(Prelude::Seed) => Some((
Ty::pyth(self.clone(), vec![]).into(),
Ty::Transformed(
ty.clone().into(),
Transformation::new(|mut expr| {
let obj = expr.obj.without_borrows();
expr.obj = ExpressionObj::Rendered(quote! {
#obj.key().as_ref()
});
Ok(Transformed::Expression(expr))
}),
),
)),
_ => None,
},
_ => None,
}
}
}