fix(examples): Dynamic Rollup Config Loading (#293)

* fix: dynamically load the rollup config by l1 chain id

* fix(client): dynamic config loading

bin/client/src/boot.rs

@@ -4,7 +4,7 @@
 use alloy_primitives::{B256, U256};
 use anyhow::{anyhow, Result};
 use kona_preimage::{PreimageKey, PreimageOracleClient};
-use kona_primitives::{RollupConfig, OP_MAINNET_CONFIG};
+use kona_primitives::RollupConfig;
 
 /// The local key ident for the L1 head hash.
 pub const L1_HEAD_KEY: U256 = U256::from_be_slice(&[1]);
@@ -89,16 +89,9 @@ impl BootInfo {
                 .try_into()
                 .map_err(|_| anyhow!("Failed to convert L2 chain ID to u64"))?,
         );
-        let rollup_config = rollup_config_from_chain_id(chain_id)?;
+        let rollup_config = RollupConfig::from_l2_chain_id(chain_id)
+            .ok_or_else(|| anyhow!("Failed to get rollup config for L2 Chain ID: {chain_id}"))?;
 
         Ok(Self { l1_head, l2_output_root, l2_claim, l2_claim_block, chain_id, rollup_config })
     }
 }
-
-/// Returns the rollup config for the given chain ID.
-fn rollup_config_from_chain_id(chain_id: u64) -> Result<RollupConfig> {
-    match chain_id {
-        10 => Ok(OP_MAINNET_CONFIG),
-        _ => anyhow::bail!("Unsupported chain ID: {}", chain_id),
-    }
-}

crates/derive/src/online/alloy_providers.rs

@@ -178,6 +178,17 @@ impl AlloyL2ChainProvider {
         }
     }
 
+    /// Returns the chain ID.
+    pub async fn chain_id(&mut self) -> Result<u64> {
+        let chain_id: TransportResult<alloc::string::String> =
+            self.inner.raw_request("eth_chainId".into(), ()).await;
+        let chain_id = match chain_id {
+            Ok(s) => alloc::string::String::from(s.trim_start_matches("0x")),
+            Err(e) => return Err(anyhow!(e)),
+        };
+        u64::from_str_radix(&chain_id, 16).map_err(|e| anyhow!(e))
+    }
+
     /// Creates a new [AlloyL2ChainProvider] from the provided [reqwest::Url].
     pub fn new_http(url: reqwest::Url, rollup_config: Arc<RollupConfig>) -> Self {
         let inner = ReqwestProvider::new_http(url);

examples/trusted-sync/src/main.rs

@@ -1,6 +1,6 @@
 use anyhow::{anyhow, Result};
 use clap::Parser;
-use kona_derive::{online::*, types::OP_MAINNET_CONFIG};
+use kona_derive::online::*;
 use reqwest::Url;
 use std::sync::Arc;
 use tracing::{debug, error, info, warn, Level};
@@ -37,10 +37,18 @@ async fn sync(cli_cfg: crate::cli::Cli) -> Result<()> {
     let beacon_url: String =
         cli_cfg.beacon_url.unwrap_or_else(|| std::env::var(BEACON_URL).unwrap());
 
-    // Construct the pipeline and payload validator.
-    let cfg = Arc::new(OP_MAINNET_CONFIG);
-    let start = cli_cfg.start_l2_block.unwrap_or(cfg.genesis.l2.number);
+    // Query for the L2 Chain ID
+    let mut l2_provider =
+        AlloyL2ChainProvider::new_http(l2_rpc_url.clone(), Arc::new(RollupConfig::default()));
+    let l2_chain_id =
+        l2_provider.chain_id().await.expect("Failed to fetch chain ID from L2 provider");
+    let cfg = RollupConfig::from_l2_chain_id(l2_chain_id)
+        .expect("Failed to fetch rollup config from L2 chain ID");
+    let cfg = Arc::new(cfg);
+
+    // Construct the pipeline
     let mut l1_provider = AlloyChainProvider::new_http(l1_rpc_url);
+    let start = cli_cfg.start_l2_block.unwrap_or(cfg.genesis.l2.number);
     let mut l2_provider = AlloyL2ChainProvider::new_http(l2_rpc_url.clone(), cfg.clone());
     let attributes =
         StatefulAttributesBuilder::new(cfg.clone(), l2_provider.clone(), l1_provider.clone());