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enhance: allow validator find script datum via both DatumDict or InlineDatum & add partial swap #7

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merged 4 commits into from
Oct 24, 2023
Merged

enhance: allow validator find script datum via both DatumDict or InlineDatum & add partial swap #7

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81db49e
allow validator find script datum via both DatumDict or InlineDatum
h2physics Oct 18, 2023
e074857
add partial swap
h2physics Oct 20, 2023
c9be21e
add some safety check
h2physics Oct 23, 2023
3a05836
add some safety check
h2physics Oct 23, 2023
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33 changes: 23 additions & 10 deletions lib/amm_dex_v2/math.ak
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Original file line number Diff line number Diff line change
Expand Up @@ -62,6 +62,23 @@ pub fn calculate_amount_out(
numerator / denominator
}

pub fn calculate_max_in_swap(
reserve_in: Int,
reserve_out: Int,
trading_fee_numerator: Int,
trading_fee_denominator: Int,
io_ratio_numerator: Int,
io_ratio_denominator: Int,
) -> Int {
let diff = trading_fee_denominator - trading_fee_numerator
let numerator =
io_ratio_numerator * diff * reserve_out - io_ratio_denominator * trading_fee_denominator * reserve_in
let denominator = io_ratio_denominator * diff
let max_in_swap = numerator / denominator
expect max_in_swap > 0
max_in_swap
}

pub fn calculate_amount_out_fraction(
reserve_in: Int,
reserve_out: Int,
Expand All @@ -83,16 +100,12 @@ pub fn calculate_amount_in(
amount_out: Int,
trading_fee_numerator: Int,
trading_fee_denominator: Int,
) -> Option<Int> {
if amount_out >= reserve_out {
None
} else {
let diff = trading_fee_denominator - trading_fee_numerator
let numerator = reserve_in * amount_out * trading_fee_denominator
let denominator = ( reserve_out - amount_out ) * diff
let amount_in = numerator / denominator + 1
Some(amount_in)
}
) -> Int {
expect amount_out < reserve_out
let diff = trading_fee_denominator - trading_fee_numerator
let numerator = reserve_in * amount_out * trading_fee_denominator
let denominator = ( reserve_out - amount_out ) * diff
numerator / denominator + 1
}

// Calculate liquidity amount which will be minted for profit sharing
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