fix(stages): transaction lookup stage checkpoint calculation (#3909)

crates/stages/src/stages/tx_lookup.rs

@@ -11,9 +11,9 @@ use reth_db::{
 use reth_primitives::{
     keccak256,
     stage::{EntitiesCheckpoint, StageCheckpoint, StageId},
-    TransactionSignedNoHash, TxNumber, H256,
+    PrunePart, TransactionSignedNoHash, TxNumber, H256,
 };
-use reth_provider::DatabaseProviderRW;
+use reth_provider::{BlockReader, DatabaseProviderRW, PruneCheckpointReader};
 use tokio::sync::mpsc;
 use tracing::*;
 
@@ -183,9 +183,20 @@ fn calculate_hash(
 
 fn stage_checkpoint<DB: Database>(
     provider: &DatabaseProviderRW<'_, &DB>,
-) -> Result<EntitiesCheckpoint, DatabaseError> {
+) -> Result<EntitiesCheckpoint, StageError> {
+    let pruned_entries = provider
+        .get_prune_checkpoint(PrunePart::TransactionLookup)?
+        .map(|checkpoint| provider.block_body_indices(checkpoint.block_number))
+        .transpose()?
+        .flatten()
+        // +1 is needed because TxNumber is 0-indexed
+        .map(|body| body.last_tx_num() + 1)
+        .unwrap_or_default();
     Ok(EntitiesCheckpoint {
-        processed: provider.tx_ref().entries::<tables::TxHashNumber>()? as u64,
+        // If `TxHashNumber` table was pruned, we will have a number of entries in it not matching
+        // the actual number of processed transactions. To fix that, we add the number of pruned
+        // `TxHashNumber` entries.
+        processed: provider.tx_ref().entries::<tables::TxHashNumber>()? as u64 + pruned_entries,
         total: provider.tx_ref().entries::<tables::Transactions>()? as u64,
     })
 }
@@ -202,8 +213,13 @@ mod tests {
         generators,
         generators::{random_block, random_block_range},
     };
-    use reth_primitives::{stage::StageUnitCheckpoint, BlockNumber, SealedBlock, H256};
-    use reth_provider::{BlockReader, ProviderError, TransactionsProvider};
+    use reth_primitives::{
+        stage::StageUnitCheckpoint, BlockNumber, PruneCheckpoint, PruneMode, SealedBlock, H256,
+        MAINNET,
+    };
+    use reth_provider::{
+        BlockReader, ProviderError, ProviderFactory, PruneCheckpointWriter, TransactionsProvider,
+    };
 
     // Implement stage test suite.
     stage_test_suite_ext!(TransactionLookupTestRunner, transaction_lookup);
@@ -321,6 +337,57 @@ mod tests {
         assert!(runner.validate_execution(first_input, result.ok()).is_ok(), "validation failed");
     }
 
+    #[test]
+    fn stage_checkpoint_pruned() {
+        let tx = TestTransaction::default();
+        let mut rng = generators::rng();
+
+        let blocks = random_block_range(&mut rng, 0..=100, H256::zero(), 0..10);
+        tx.insert_blocks(blocks.iter(), None).expect("insert blocks");
+
+        let max_pruned_block = 30;
+        let max_processed_block = 70;
+
+        let mut tx_hash_numbers = Vec::new();
+        let mut tx_hash_number = 0;
+        for block in &blocks[..=max_processed_block] {
+            for transaction in &block.body {
+                if block.number > max_pruned_block {
+                    tx_hash_numbers.push((transaction.hash, tx_hash_number));
+                }
+                tx_hash_number += 1;
+            }
+        }
+        tx.insert_tx_hash_numbers(tx_hash_numbers).expect("insert tx hash numbers");
+
+        let provider = tx.inner_rw();
+        provider
+            .save_prune_checkpoint(
+                PrunePart::TransactionLookup,
+                PruneCheckpoint {
+                    block_number: max_pruned_block as BlockNumber,
+                    prune_mode: PruneMode::Full,
+                },
+            )
+            .expect("save stage checkpoint");
+        provider.commit().expect("commit");
+
+        let db = tx.inner_raw();
+        let factory = ProviderFactory::new(db.as_ref(), MAINNET.clone());
+        let provider = factory.provider_rw().expect("provider rw");
+
+        assert_eq!(
+            stage_checkpoint(&provider).expect("stage checkpoint"),
+            EntitiesCheckpoint {
+                processed: blocks[..=max_processed_block]
+                    .iter()
+                    .map(|block| block.body.len() as u64)
+                    .sum::<u64>(),
+                total: blocks.iter().map(|block| block.body.len() as u64).sum::<u64>()
+            }
+        );
+    }
+
     struct TransactionLookupTestRunner {
         tx: TestTransaction,
         threshold: u64,