Make a dedicated IndexDb

processor/scanner/src/db.rs

@@ -44,13 +44,8 @@ impl<S: ScannerFeed> OutputWithInInstruction<S> {
 
 create_db!(
   Scanner {
-    BlockId: (number: u64) -> [u8; 32],
-    BlockNumber: (id: [u8; 32]) -> u64,
-
     ActiveKeys: <K: Borshy>() -> Vec<SeraiKeyDbEntry<K>>,
 
-    // The latest finalized block to appear of a blockchain
-    LatestFinalizedBlock: () -> u64,
     // The next block to scan for received outputs
     NextToScanForOutputsBlock: () -> u64,
     // The next block to check for resolving eventualities
@@ -89,17 +84,6 @@ create_db!(
 
 pub(crate) struct ScannerDb<S: ScannerFeed>(PhantomData<S>);
 impl<S: ScannerFeed> ScannerDb<S> {
-  pub(crate) fn set_block(txn: &mut impl DbTxn, number: u64, id: [u8; 32]) {
-    BlockId::set(txn, number, &id);
-    BlockNumber::set(txn, id, &number);
-  }
-  pub(crate) fn block_id(getter: &impl Get, number: u64) -> Option<[u8; 32]> {
-    BlockId::get(getter, number)
-  }
-  pub(crate) fn block_number(getter: &impl Get, id: [u8; 32]) -> Option<u64> {
-    BlockNumber::get(getter, id)
-  }
-
   // activation_block_number is inclusive, so the key will be scanned for starting at the specified
   // block
   pub(crate) fn queue_key(txn: &mut impl DbTxn, activation_block_number: u64, key: KeyFor<S>) {
@@ -155,13 +139,13 @@ impl<S: ScannerFeed> ScannerDb<S> {
 
   pub(crate) fn set_start_block(txn: &mut impl DbTxn, start_block: u64, id: [u8; 32]) {
     assert!(
-      LatestFinalizedBlock::get(txn).is_none(),
+      NextToScanForOutputsBlock::get(txn).is_none(),
       "setting start block but prior set start block"
     );
 
-    Self::set_block(txn, start_block, id);
+    crate::index::IndexDb::set_block(txn, start_block, id);
+    crate::index::IndexDb::set_latest_finalized_block(txn, start_block);
 
-    LatestFinalizedBlock::set(txn, &start_block);
     NextToScanForOutputsBlock::set(txn, &start_block);
     // We can receive outputs in this block, but any descending transactions will be in the next
     // block. This, with the check on-set, creates a bound that this value in the DB is non-zero.
@@ -169,13 +153,6 @@ impl<S: ScannerFeed> ScannerDb<S> {
     NextToPotentiallyReportBlock::set(txn, &start_block);
   }
 
-  pub(crate) fn set_latest_finalized_block(txn: &mut impl DbTxn, latest_finalized_block: u64) {
-    LatestFinalizedBlock::set(txn, &latest_finalized_block);
-  }
-  pub(crate) fn latest_finalized_block(getter: &impl Get) -> Option<u64> {
-    LatestFinalizedBlock::get(getter)
-  }
-
   pub(crate) fn latest_scannable_block(getter: &impl Get) -> Option<u64> {
     // We can only scan up to whatever block we've checked the Eventualities of, plus the window
     // length. Since this returns an inclusive bound, we need to subtract 1

processor/scanner/src/index/db.rs

@@ -0,0 +1,34 @@
+use serai_db::{Get, DbTxn, create_db};
+
+create_db!(
+  ScannerIndex {
+    // A lookup of a block's number to its ID
+    BlockId: (number: u64) -> [u8; 32],
+    // A lookup of a block's ID to its number
+    BlockNumber: (id: [u8; 32]) -> u64,
+
+    // The latest finalized block to appear on the blockchain
+    LatestFinalizedBlock: () -> u64,
+  }
+);
+
+pub(crate) struct IndexDb;
+impl IndexDb {
+  pub(crate) fn set_block(txn: &mut impl DbTxn, number: u64, id: [u8; 32]) {
+    BlockId::set(txn, number, &id);
+    BlockNumber::set(txn, id, &number);
+  }
+  pub(crate) fn block_id(getter: &impl Get, number: u64) -> Option<[u8; 32]> {
+    BlockId::get(getter, number)
+  }
+  pub(crate) fn block_number(getter: &impl Get, id: [u8; 32]) -> Option<u64> {
+    BlockNumber::get(getter, id)
+  }
+
+  pub(crate) fn set_latest_finalized_block(txn: &mut impl DbTxn, latest_finalized_block: u64) {
+    LatestFinalizedBlock::set(txn, &latest_finalized_block);
+  }
+  pub(crate) fn latest_finalized_block(getter: &impl Get) -> Option<u64> {
+    LatestFinalizedBlock::get(getter)
+  }
+}

processor/scanner/src/index/mod.rs

@@ -1,9 +1,11 @@
 use serai_db::{DbTxn, Db};
 
-use primitives::BlockHeader;
+use primitives::{task::ContinuallyRan, BlockHeader};
 
-// TODO: Localize to IndexDb?
-use crate::{db::ScannerDb, ScannerFeed, ContinuallyRan};
+use crate::ScannerFeed;
+
+mod db;
+pub(crate) use db::IndexDb;
 
 /*
   This processor should build its own index of the blockchain, yet only for finalized blocks which
@@ -22,7 +24,7 @@ struct IndexFinalizedTask<D: Db, S: ScannerFeed> {
 impl<D: Db, S: ScannerFeed> ContinuallyRan for IndexFinalizedTask<D, S> {
   async fn run_iteration(&mut self) -> Result<bool, String> {
     // Fetch the latest finalized block
-    let our_latest_finalized = ScannerDb::<S>::latest_finalized_block(&self.db)
+    let our_latest_finalized = IndexDb::latest_finalized_block(&self.db)
       .expect("IndexTask run before writing the start block");
     let latest_finalized = match self.feed.latest_finalized_block_number().await {
       Ok(latest_finalized) => latest_finalized,
@@ -51,7 +53,7 @@ impl<D: Db, S: ScannerFeed> ContinuallyRan for IndexFinalizedTask<D, S> {
       // Check this descends from our indexed chain
       {
         let expected_parent =
-          ScannerDb::<S>::block_id(&self.db, b - 1).expect("didn't have the ID of the prior block");
+          IndexDb::block_id(&self.db, b - 1).expect("didn't have the ID of the prior block");
         if block.parent() != expected_parent {
           panic!(
             "current finalized block (#{b}, {}) doesn't build off finalized block (#{}, {})",
@@ -64,8 +66,8 @@ impl<D: Db, S: ScannerFeed> ContinuallyRan for IndexFinalizedTask<D, S> {
 
       // Update the latest finalized block
       let mut txn = self.db.txn();
-      ScannerDb::<S>::set_block(&mut txn, b, block.id());
-      ScannerDb::<S>::set_latest_finalized_block(&mut txn, b);
+      IndexDb::set_block(&mut txn, b, block.id());
+      IndexDb::set_latest_finalized_block(&mut txn, b);
       txn.commit();
     }
 

processor/scanner/src/lib.rs

@@ -112,7 +112,7 @@ pub trait ScannerFeed: Send + Sync {
     // Check the ID of this block is the expected ID
     {
       let expected =
-        ScannerDb::<S>::block_id(&self.db, number).expect("requested a block which wasn't indexed");
+        crate::index::IndexDb::block_id(&self.db, number).expect("requested a block which wasn't indexed");
       if block.id() != expected {
         panic!(
           "finalized chain reorganized from {} to {} at {}",