fix(fortuna): configurable backlog processing (#2459)

Author: jayantk

apps/fortuna/Cargo.lock

@@ -1,6 +1,6 @@
 [package]
 name = "fortuna"
-version = "7.4.6"
+version = "7.4.7"
 edition = "2021"
 
 [lib]

apps/fortuna/Cargo.toml

@@ -128,6 +128,10 @@ pub struct EthereumConfig {
     #[serde(default)]
     pub confirmed_block_status: BlockStatus,
 
+    /// The number of blocks to look back for events that might be missed when starting the keeper
+    #[serde(default = "default_backlog_range")]
+    pub backlog_range: u64,
+
     /// Use the legacy transaction format (for networks without EIP 1559)
     #[serde(default)]
     pub legacy_tx: bool,
@@ -194,6 +198,10 @@ fn default_priority_fee_multiplier_pct() -> u64 {
     100
 }
 
+fn default_backlog_range() -> u64 {
+    1000
+}
+
 #[derive(Clone, Debug, serde::Serialize, serde::Deserialize)]
 pub struct EscalationPolicyConfig {
     // The keeper will perform the callback as long as the tx is within this percentage of the configured gas limit.

apps/fortuna/src/config.rs

@@ -33,8 +33,6 @@ pub(crate) mod keeper_metrics;
 pub(crate) mod process_event;
 pub(crate) mod track;
 
-/// How many blocks to look back for events that might be missed when starting the keeper
-const BACKLOG_RANGE: u64 = 1000;
 /// Track metrics in this interval
 const TRACK_INTERVAL: Duration = Duration::from_secs(10);
 /// Check whether we need to conduct a withdrawal at this interval.
@@ -80,12 +78,12 @@ pub async fn run_keeper_threads(
 
     let fulfilled_requests_cache = Arc::new(RwLock::new(HashSet::<u64>::new()));
 
-    // Spawn a thread to handle the events from last BACKLOG_RANGE blocks.
+    // 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),
+                from: latest_safe_block.saturating_sub(chain_eth_config.backlog_range),
                 to: latest_safe_block,
             },
             contract.clone(),