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Original file line number | Diff line number | Diff line change |
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@@ -1,71 +1,77 @@ | ||
use starknet::storage_access::{StorePacking}; | ||
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const MASK_BOOK_ID: u256 = consteval_int!(2 * *192); | ||
const MASK_TICK: u256 = consteval_int!(2 * *32); | ||
const MASK_INDEX: u256 = consteval_int!(2 * *40); | ||
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const TWO_POW_72: u256 = consteval_int!(2 * *72); | ||
const TWO_POW_40: u256 = consteval_int!(2 * *40); | ||
const TWO_POW_192: u256 = 0x1000000000000000000000000000000000000000000000000; // 2**192 | ||
const TWO_POW_64: u256 = 0x10000000000000000; // 2**64 | ||
const TWO_POW_40: u64 = 0x10000000000; // 2**40 | ||
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#[derive(Copy, Drop, Serde, Debug)] | ||
pub struct OrderId { | ||
pub book_id: u256, // u192 | ||
pub tick: i32, // u32 | ||
pub book_id: felt252, // u192 | ||
pub tick: u32, // todo: change to Tick struct | ||
pub index: u64, // u40 | ||
} | ||
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#[generate_trait] | ||
impl OrderIdImpl of OrderIdTrait { | ||
fn encode(self: OrderId) -> u256 { | ||
assert(self.book_id < MASK_BOOK_ID, "book_id overflow"); | ||
assert(self.tick < MASK_TICK, "tick overflow"); | ||
assert(self.index < MASK_INDEX, "index overflow"); | ||
return self.book_id * TWO_POW_72 + self.tick * TWO_POW_40 + self.index; | ||
fn encode(self: OrderId) -> felt252 { | ||
assert(self.book_id.into() < TWO_POW_192, 'book_id overflow'); | ||
assert(self.index < TWO_POW_40, 'index overflow'); | ||
return self.book_id.try_into().unwrap() * TWO_POW_64.try_into().unwrap() | ||
+ self.tick.into() * TWO_POW_40.try_into().unwrap() | ||
+ self.index.into(); | ||
} | ||
} | ||
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impl OrderIdStoragePacking of StoragePacking<OrderId, u256> { | ||
fn pack(value: OrderId) -> u256 { | ||
impl OrderIdStoragePacking of StorePacking<OrderId, felt252> { | ||
fn pack(value: OrderId) -> felt252 { | ||
value.encode() | ||
} | ||
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fn unpack(value: u256) -> OrderId { | ||
let book_id = value / TWO_POW_72; | ||
let tick = (value % TWO_POW_72) / TWO_POW_40; | ||
let index = value % TWO_POW_40; | ||
OrderId { book_id, tick, index } | ||
fn unpack(value: felt252) -> OrderId { | ||
let casted_value: u256 = value.into(); | ||
let book_id: u256 = casted_value / TWO_POW_64.into(); | ||
let tick_felt252: felt252 = (casted_value % TWO_POW_64.into() / TWO_POW_40.into()) | ||
.try_into() | ||
.unwrap(); | ||
let index: u64 = (casted_value % TWO_POW_40.into()).try_into().unwrap(); | ||
OrderId { | ||
book_id: book_id.try_into().unwrap(), tick: tick_felt252.try_into().unwrap(), index | ||
} | ||
} | ||
} | ||
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#[cfg(test)] | ||
mod tests { | ||
use super::OrderId; | ||
use super::OrderIdImpl; | ||
use super::StoragePacking; | ||
use super::StorePacking; | ||
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// todo delete this | ||
const TWO_POW_24: u32 = 0x1000000; // 2**24 | ||
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#[test] | ||
fn encode() { | ||
let order_id = OrderId { book_id: 1, tick: 2, index: 3 }; | ||
let encoded = order_id.encode(); | ||
assert_eq!(encoded, 0x10000020000000003_u256); | ||
assert_eq!(encoded, 0x10000020000000003_felt252); | ||
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let order_id = OrderId { book_id: 1, tick: -2, index: 3 }; | ||
let order_id = OrderId { book_id: 1, tick: TWO_POW_24 - 2, index: 3 }; | ||
let encoded = order_id.encode(); | ||
assert_eq!(encoded, 0x1fffffe0000000003_u256); | ||
assert_eq!(encoded, 0x1fffffe0000000003_felt252); | ||
} | ||
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#[test] | ||
fn unpack() { | ||
let encoded = 0x10000020000000003_u256; | ||
let order_id = OrderId::unpack(encoded); | ||
let encoded = 0x10000020000000003_felt252; | ||
let order_id: OrderId = StorePacking::unpack(encoded); | ||
assert_eq!(order_id.book_id, 1); | ||
assert_eq!(order_id.tick, 2); | ||
assert_eq!(order_id.index, 3); | ||
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let encoded = 0x1fffffe0000000003_u256; | ||
let order_id = OrderId::unpack(encoded); | ||
let encoded = 0x1fffffe0000000003_felt252; | ||
let order_id: OrderId = StorePacking::unpack(encoded); | ||
assert_eq!(order_id.book_id, 1); | ||
assert_eq!(order_id.tick, -2); | ||
assert_eq!(order_id.tick, TWO_POW_24 - 2); | ||
assert_eq!(order_id.index, 3); | ||
} | ||
} |