chore: Move fee logic out of primitives (#174)

pallas-primitives/src/byron/fees.rs

@@ -1,73 +0,0 @@
-use crate::Error;
-
-use super::TxPayload;
-use pallas_codec::minicbor::to_vec;
-
-pub struct PolicyParams {
-    constant: u64,
-    size_coeficient: u64,
-}
-
-impl Default for PolicyParams {
-    fn default() -> Self {
-        Self {
-            constant: 155_381_000_000_000u64,
-            size_coeficient: 43_946_000_000u64,
-        }
-    }
-}
-
-fn compute_linear_fee_policy(tx_size: u64, params: &PolicyParams) -> u64 {
-    println!("tx size: {}", tx_size);
-    let nanos = params.constant + (tx_size * params.size_coeficient);
-
-    let loves = nanos / 1_000_000_000;
-
-    let rem = match nanos % 1_000_000_000 {
-        0 => 0u64,
-        _ => 1u64,
-    };
-
-    loves + rem
-}
-
-impl TxPayload {
-    pub fn compute_fee(&self, params: &PolicyParams) -> Result<u64, Error> {
-        let tx_size = to_vec(&self)?.len();
-        let fee = compute_linear_fee_policy(tx_size as u64, params);
-
-        Ok(fee)
-    }
-
-    pub fn compute_fee_with_defaults(&self) -> Result<u64, Error> {
-        self.compute_fee(&PolicyParams::default())
-    }
-}
-
-#[cfg(test)]
-mod tests {
-    use pallas_codec::minicbor;
-
-    use crate::byron::Block;
-
-    type BlockWrapper = (u16, Block);
-
-    #[test]
-    fn known_fee_matches() {
-        // TODO: expand this test to include more test blocks
-        let block_idx = 1;
-        let block_str = include_str!("../../../test_data/byron4.block");
-
-        let block_bytes = hex::decode(block_str).expect(&format!("bad block file {}", block_idx));
-        let (_, block): BlockWrapper = minicbor::decode(&block_bytes[..])
-            .expect(&format!("error decoding cbor for file {}", block_idx));
-
-        // don't want to pass if we don't have tx in the block
-        assert!(block.body.tx_payload.len() > 0);
-
-        for tx in block.body.tx_payload.iter().take(1) {
-            let fee = tx.compute_fee_with_defaults().unwrap();
-            assert_eq!(fee, 171070);
-        }
-    }
-}

pallas-primitives/src/byron/mod.rs

@@ -1,6 +1,5 @@
 //! Ledger primitives and cbor codec for the Byron era
 
-mod fees;
 mod model;
 
 pub use model::*;