feat(configs): add Shelley config structs (#359)

pallas-configs/src/lib.rs

@@ -1,3 +1,4 @@
 //! Genesis data structs and utilities
 
 pub mod byron;
+pub mod shelley;

pallas-configs/src/shelley.rs

@@ -0,0 +1,103 @@
+use serde::Deserialize;
+use std::collections::HashMap;
+
+#[derive(Debug, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct GenDelegs {
+    pub delegate: Option<String>,
+    pub vrf: Option<String>,
+}
+
+#[derive(Debug, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct ProtocolVersion {
+    pub minor: Option<u32>,
+    pub major: Option<u32>,
+}
+
+#[derive(Debug, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct ExtraEntropy {
+    pub tag: Option<String>,
+}
+
+#[derive(Debug, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct ProtocolParams {
+    pub protocol_version: Option<ProtocolVersion>,
+    pub decentralisation_param: Option<u32>,
+    pub e_max: Option<u32>,
+    pub extra_entropy: Option<ExtraEntropy>,
+    pub max_tx_size: Option<u32>,
+    pub max_block_body_size: Option<u32>,
+    pub max_block_header_size: Option<u32>,
+    pub min_fee_a: Option<u32>,
+    pub min_fee_b: Option<u32>,
+    pub min_u_tx_o_value: Option<u32>,
+    pub pool_deposit: Option<u64>,
+    pub min_pool_cost: Option<u64>,
+    pub key_deposit: Option<u32>,
+    pub n_opt: Option<u32>,
+    pub rho: Option<f32>,
+    pub tau: Option<f32>,
+    pub a0: Option<f32>,
+}
+
+#[derive(Debug, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct Staking {
+    pub pools: Option<HashMap<String, String>>,
+    pub stake: Option<HashMap<String, String>>,
+}
+
+#[derive(Debug, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct GenesisFile {
+    pub active_slots_coeff: Option<f32>,
+    pub epoch_length: Option<u32>,
+    pub gen_delegs: Option<HashMap<String, GenDelegs>>,
+    pub initial_funds: Option<HashMap<String, String>>,
+    pub max_kes_evolutions: Option<u32>,
+    pub max_lovelace_supply: Option<u64>,
+    pub network_id: Option<String>,
+    pub network_magic: Option<u32>,
+    pub protocol_params: Option<ProtocolParams>,
+    pub security_param: Option<u32>,
+    pub slot_length: Option<u32>,
+    pub slots_per_kes_period: Option<u32>,
+    pub staking: Option<Staking>,
+    pub system_start: Option<String>,
+    pub update_quorum: Option<u32>,
+}
+
+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}-shelley-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");
+    }
+}