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initial commit #4

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52 changes: 43 additions & 9 deletions src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -38,7 +38,7 @@ pub struct ProjectedFees {
pub minimum_fee: (u64, u64),
}

pub async fn calculate_fee(utxos: Option<Vec<Utxo>>, amount: u64) -> Result<ProjectedFees, FestivusError> {
pub async fn calculate_fee(utxos: Option<Vec<Utxo>>, amount: u64, user_fee_rate: Option<u64>) -> Result<ProjectedFees, FestivusError> {
// Create a random taproot keypair for the ouput.
let secp = Secp256k1::new();
let mut rand = rand::thread_rng();
Expand Down Expand Up @@ -87,13 +87,24 @@ pub async fn calculate_fee(utxos: Option<Vec<Utxo>>, amount: u64) -> Result<Proj
let virtual_bytes = weight.to_vbytes_ceil();

// Get fees
let fees = reqwest::get("https://mempool.space/api/v1/fees/recommended")
let fees = if let Some(fee_rate) = user_fee_rate {
// User provides a fee rate
RecommendedFess {
fastest_fee: fee_rate,
half_hour_fee: fee_rate,
hour_fee: fee_rate,
economy_fee: fee_rate,
minimum_fee: fee_rate,
}
} else {
// User does not provide a fee rate
reqwest::get("https://mempool.space/api/v1/fees/recommended")
.await
.map_err(|_| FestivusError::ReqwestError)?
.json::<RecommendedFess>()
.await
.map_err(|_| FestivusError::ReqwestError)?;

.map_err(|_| FestivusError::ReqwestError)?
};
// Calc total amount
Ok(ProjectedFees {
fastest_fee: (virtual_bytes * fees.fastest_fee, fees.fastest_fee),
Expand Down Expand Up @@ -163,7 +174,7 @@ mod tests {

let utxos = vec![utxo_one, utxo_two];

let fees = calculate_fee(Some(utxos), 19_000).await;
let fees = calculate_fee(Some(utxos), 19_000, None).await;

assert_eq!(fees.is_ok(), true)
}
Expand All @@ -184,14 +195,14 @@ mod tests {

let utxos = vec![utxo_one, utxo_two];

let fees = calculate_fee(Some(utxos), 19_000).await;
let fees = calculate_fee(Some(utxos), 19_000, None).await;

assert_eq!(fees.is_ok(), true)
}

#[tokio::test]
async fn no_utxos() {
let fees = calculate_fee(None, 19_000).await;
let fees = calculate_fee(None, 19_000, None).await;

assert_eq!(fees.is_ok(), true)
}
Expand All @@ -213,7 +224,7 @@ mod tests {

let utxos = vec![utxo_one, utxo_two];

let fees = calculate_fee(Some(utxos), 125_000_000).await;
let fees = calculate_fee(Some(utxos), 125_000_000, None).await;

assert_eq!(fees.is_ok(), true)
}
Expand All @@ -234,8 +245,31 @@ mod tests {

let utxos = vec![utxo_one, utxo_two];

let fees = calculate_fee(Some(utxos), 19_000).await;
let fees = calculate_fee(Some(utxos), 19_000, None).await;

assert_eq!(fees.is_err(), true)
}

#[tokio::test]
async fn calculate_fee_with_user_provided_rate() {
let mut utxo_one = Utxo::default();
utxo_one.amount_sat = Amount::from_btc(1.0).unwrap().to_sat() as i64;

let mut utxo_two = Utxo::default();
utxo_two.amount_sat = Amount::from_btc(0.5).unwrap().to_sat() as i64;

let utxos = vec![utxo_one, utxo_two];

let user_fee_rate = 50;

let fees = calculate_fee(Some(utxos), 125_000_000, Some(user_fee_rate)).await.unwrap();

// Testing the second item in each fee pair of the ProjectedFees struct
// which is just the fee rate not the math of each fee * virtual_bytes
assert_eq!(fees.fastest_fee.1, user_fee_rate);
assert_eq!(fees.half_hour_fee.1, user_fee_rate);
assert_eq!(fees.hour_fee.1, user_fee_rate);
assert_eq!(fees.economy_fee.1, user_fee_rate);
assert_eq!(fees.minimum_fee.1, user_fee_rate);
}
}