feat: extract optimism genesis info

Cargo.toml

@@ -37,6 +37,7 @@ alloy-primitives = { version = "0.7.1", default-features = false }
 
 alloy = { version = "0.1" }
 alloy-consensus = { version = "0.1", default-features = false}
+alloy-genesis = { version = "0.1", default-features = false }
 alloy-network = { version = "0.1", default-features = false }
 alloy-rpc-types = { version = "0.1" }
 alloy-rpc-types-eth = { version = "0.1" }

crates/rpc-types/Cargo.toml

@@ -14,6 +14,7 @@ exclude.workspace = true
 [dependencies]
 op-alloy-consensus = { workspace = true, features = ["serde"] }
 
+alloy-genesis.workspace = true
 alloy-primitives = { workspace = true, features = ["rlp", "serde", "std"] }
 alloy-rpc-types-eth.workspace = true
 alloy-network.workspace = true

crates/rpc-types/src/genesis.rs

@@ -1,5 +1,7 @@
 //! OP types for genesis data.
 
+use alloy_genesis::Genesis;
+
 /// Genesis info for Optimism.
 #[derive(Default, Debug, Clone, Copy, Eq, PartialEq, serde::Serialize, serde::Deserialize)]
 #[serde(rename_all = "camelCase")]
@@ -27,3 +29,22 @@ pub struct OptimismBaseFeeInfo {
     /// EIP-1559 denominator after canyon
     pub eip1559_denominator_canyon: Option<u64>,
 }
+
+impl OptimismGenesisInfo {
+    /// Extract the Optimism genesis info from the genesis.
+    pub fn extract_from(genesis: &Genesis) -> Option<Self> {
+        genesis.config.extra_fields.deserialize_as().ok()
+    }
+}
+
+impl OptimismBaseFeeInfo {
+    /// Extract the Optimism base fee info from the genesis.
+    pub fn extract_from(genesis: &Genesis) -> Option<Self> {
+        if let Some(Ok(optimism_base_fee_info)) =
+            genesis.config.extra_fields.get_deserialized::<OptimismBaseFeeInfo>("optimism")
+        {
+            return Some(optimism_base_fee_info);
+        }
+        None
+    }
+}