Use u64 since U256 was not deserialized correctly from config

apps/fortuna/src/config.rs

@@ -161,7 +161,7 @@ pub struct EthereumConfig {
  pub confirmed_block_status: BlockStatus,
 
  /// The gas limit to use for entropy callback transactions.
- pub gas_limit: U256,
+ pub gas_limit: u64,
 }
 
 #[derive(Args, Clone, Debug)]

apps/fortuna/src/keeper.rs

@@ -228,14 +228,15 @@ pub async fn run_keeper_threads(
  let fulfilled_requests_cache = Arc::new(RwLock::new(HashMap::<u64, RequestState>::new()));
 
  // Spawn a thread to handle the events from last BACKLOG_RANGE blocks.
+ let gas_limit: U256 = chain_eth_config.gas_limit.into();
  spawn(
  process_backlog(
  BlockRange {
  from: latest_safe_block.saturating_sub(BACKLOG_RANGE),
  to: latest_safe_block,
  },
  contract.clone(),
- chain_eth_config.gas_limit,
+ gas_limit,
  chain_state.clone(),
  keeper_metrics.clone(),
  fulfilled_requests_cache.clone(),
@@ -260,7 +261,7 @@ pub async fn run_keeper_threads(
  chain_state.clone(),
  rx,
  Arc::clone(&contract),
- chain_eth_config.gas_limit,
+ gas_limit,
  keeper_metrics.clone(),
  fulfilled_requests_cache.clone(),
  )

apps/fortuna/src/main.rs

@@ -4,6 +4,7 @@
 use {
  anyhow::Result,
  clap::Parser,
+ ethers::types::U256,
  std::io::IsTerminal,
 };