feat: add support for Conway config and params traverse (#521)

Co-authored-by: Clark Alesna <clark_alesna@hotmail.com>
Co-authored-by: johnquinnvictaboada <quinnvictaboada@gmail.com>

pallas-configs/src/conway.rs

@@ -0,0 +1,110 @@
+use serde::Deserialize;
+use std::collections::HashMap;
+
+#[derive(Debug, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct GenesisFile {
+    pub pool_voting_thresholds: PoolVotingThresholds,
+    pub d_rep_voting_thresholds: DRepVotingThresholds,
+    pub committee_min_size: u64,
+    pub committee_max_term_length: u32,
+    pub gov_action_lifetime: u32,
+    pub gov_action_deposit: u64,
+    pub d_rep_deposit: u64,
+    pub d_rep_activity: u32,
+    pub min_fee_ref_script_cost_per_byte: u64,
+    pub plutus_v3_cost_model: Vec<i64>,
+    pub constitution: Constitution,
+    pub committee: Committee,
+}
+
+#[derive(Debug, Deserialize, Clone)]
+#[serde(rename_all = "camelCase")]
+pub struct PoolVotingThresholds {
+    pub committee_normal: f32,
+    pub committee_no_confidence: f32,
+    pub hard_fork_initiation: f32,
+    pub motion_no_confidence: f32,
+    pub pp_security_group: f32,
+}
+
+#[derive(Debug, Deserialize, Clone)]
+#[serde(rename_all = "camelCase")]
+pub struct DRepVotingThresholds {
+    pub motion_no_confidence: f32,
+    pub committee_normal: f32,
+    pub committee_no_confidence: f32,
+    pub update_to_constitution: f32,
+    pub hard_fork_initiation: f32,
+    pub pp_network_group: f32,
+    pub pp_economic_group: f32,
+    pub pp_technical_group: f32,
+    pub pp_gov_group: f32,
+    pub treasury_withdrawal: f32,
+}
+
+#[derive(Debug, Deserialize)]
+pub struct Constitution {
+    pub anchor: Anchor,
+    pub script: String,
+}
+
+#[derive(Debug, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct Anchor {
+    pub data_hash: String,
+    pub url: String,
+}
+
+#[derive(Debug, Deserialize)]
+pub struct Committee {
+    pub members: HashMap<String, u64>,
+    pub threshold: Fraction,
+}
+
+#[derive(Deserialize, Clone, Debug)]
+pub struct Fraction {
+    pub numerator: u64,
+    pub denominator: u64,
+}
+
+impl From<Fraction> for pallas_primitives::conway::RationalNumber {
+    fn from(value: Fraction) -> Self {
+        Self {
+            numerator: value.numerator,
+            denominator: value.denominator,
+        }
+    }
+}
+
+pub fn from_file(path: &std::path::Path) -> Result<GenesisFile, std::io::Error> {
+    let file = std::fs::File::open(path)?;
+    let reader = std::io::BufReader::new(file);
+    let parsed: GenesisFile = serde_json::from_reader(reader)?;
+
+    Ok(parsed)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    fn load_test_data_config(network: &str) -> GenesisFile {
+        let path = std::path::PathBuf::from(std::env::var("CARGO_MANIFEST_DIR").unwrap())
+            .join("..")
+            .join("test_data")
+            .join(format!("{network}-conway-genesis.json"));
+
+        from_file(&path).unwrap()
+    }
+
+    #[test]
+    fn test_preview_json_loads() {
+        load_test_data_config("preview");
+    }
+
+    #[test]
+    fn test_mainnet_json_loads() {
+        load_test_data_config("mainnet");
+    }
+}

pallas-configs/src/lib.rs

@@ -2,4 +2,5 @@
 
 pub mod alonzo;
 pub mod byron;
+pub mod conway;
 pub mod shelley;

pallas-configs/src/shelley.rs

@@ -1,6 +1,6 @@
 use num_rational::BigRational;
 use pallas_crypto::hash::Hash;
-use pallas_primitives::conway::RationalNumber;
+use pallas_primitives::conway::{Epoch, RationalNumber};
 use serde::{Deserialize, Deserializer};
 use std::{collections::HashMap, str::FromStr};
 
@@ -90,7 +90,7 @@ pub struct ProtocolParams {
     pub pool_deposit: u64,
     pub n_opt: u32,
     pub min_pool_cost: u64,
-    pub e_max: u32,
+    pub e_max: Epoch,
     pub extra_entropy: ExtraEntropy,
 
     #[serde(deserialize_with = "deserialize_rational")]