fix: dedup Deposit events

sequencer/service/src/lib.rs

@@ -1,3 +1,5 @@
+#[cfg(not(feature = "standalone"))]
+use std::collections::HashSet;
 use std::{net::SocketAddr, sync::Arc, time::Duration};
 
 use anyhow::{Context as _, Result, anyhow};
@@ -260,6 +262,21 @@ async fn bedrock_deposit_loop(
     let mut cursor: Option<(MsgId, Slot)> = None;
     let poll_interval = Duration::from_secs(1);
 
+    /// Mirrors [`logos_blockchain_zone_sdk::Deposit`] but can be stored in a [`HashSet`].
+    #[derive(Debug, PartialEq, Eq, Hash)]
+    struct HashableDeposit {
+        inputs: logos_blockchain_core::mantle::ledger::Inputs,
+        metadata: Vec<u8>,
+    }
+    impl From<logos_blockchain_zone_sdk::Deposit> for HashableDeposit {
+        fn from(deposit: logos_blockchain_zone_sdk::Deposit) -> Self {
+            let logos_blockchain_zone_sdk::Deposit { inputs, metadata } = deposit;
+            Self { inputs, metadata }
+        }
+    }
+    // TODO: We should probably store this in DB.
+    let mut seen_deposits = HashSet::new();
+
     loop {
         let stream = match zone_indexer.next_messages(cursor).await {
             Ok(stream) => stream,
@@ -278,6 +295,10 @@ async fn bedrock_deposit_loop(
                     info!("Observed Bedrock channel block id {:?}", block.id);
                 }
                 ZoneMessage::Deposit(deposit) => {
+                    let hashable_deposit = HashableDeposit::from(deposit.clone());
+                    if !seen_deposits.insert(hashable_deposit) {
+                        continue;
+                    }
                     let metadata = match DepositMetadata::decode(&deposit.metadata) {
                         Ok(metadata) => metadata,
                         Err(err) => {