test(bitcoind_rpc): test reorg between next() calls

Author: LagginTimes

crates/bitcoind_rpc/tests/test_filter_iter.rs

@@ -1,5 +1,6 @@
 use bdk_bitcoind_rpc::bip158::{Event, EventInner, FilterIter};
 use bdk_core::{BlockId, CheckPoint};
+use bdk_testenv::bitcoincore_rpc::bitcoincore_rpc_json::CreateRawTransactionInput;
 use bdk_testenv::{anyhow, bitcoind, block_id, TestEnv};
 use bitcoin::{constants, Address, Amount, Network, ScriptBuf};
 use bitcoincore_rpc::RpcApi;
@@ -198,7 +199,6 @@ fn filter_iter_handles_reorg() -> anyhow::Result<()> {
     // later by a reorg.
     let unspent = client.list_unspent(None, None, None, None, None)?;
     assert!(unspent.len() >= 2);
-    use bdk_testenv::bitcoincore_rpc::bitcoincore_rpc_json::CreateRawTransactionInput;
     let unspent_1 = &unspent[0];
     let unspent_2 = &unspent[1];
     let utxo_1 = CreateRawTransactionInput {
@@ -398,6 +398,151 @@ fn filter_iter_handles_reorg() -> anyhow::Result<()> {
     Ok(())
 }
 
+#[test]
+#[allow(clippy::print_stdout)]
+fn filter_iter_handles_reorg_between_next_calls() -> anyhow::Result<()> {
+    let env = testenv()?;
+    let client = env.rpc_client();
+
+    // 1. Initial setup & mining
+    println!("STEP: Initial mining (target height 102 for maturity)");
+    let expected_initial_height = 102;
+    while env.rpc_client().get_block_count()? < expected_initial_height {
+        let _ = env.mine_blocks(1, None)?;
+    }
+    assert_eq!(
+        client.get_block_count()?,
+        expected_initial_height,
+        "Block count should be {} after initial mine",
+        expected_initial_height
+    );
+
+    // 2. Create watched script
+    println!("STEP: Creating watched script");
+    let spk_to_watch = ScriptBuf::from_hex("0014446906a6560d8ad760db3156706e72e171f3a2aa")?;
+    let address = Address::from_script(&spk_to_watch, Network::Regtest)?;
+    println!("Watching SPK: {}", spk_to_watch.to_hex_string());
+
+    // 3. Create two transactions to be confirmed in consecutive blocks
+    println!("STEP: Creating transactions to send");
+    let unspent = client.list_unspent(None, None, None, None, None)?;
+    assert!(unspent.len() >= 2);
+    let (utxo_1, utxo_2) = (
+        CreateRawTransactionInput {
+            txid: unspent[0].txid,
+            vout: unspent[0].vout,
+            sequence: None,
+        },
+        CreateRawTransactionInput {
+            txid: unspent[1].txid,
+            vout: unspent[1].vout,
+            sequence: None,
+        },
+    );
+
+    let fee = Amount::from_sat(1000);
+    let to_send = Amount::from_sat(50_000);
+    let change_1 = (unspent[0].amount - to_send - fee).to_sat();
+    let change_2 = (unspent[1].amount - to_send - fee).to_sat();
+
+    let make_tx = |utxo, change_amt| {
+        let out = [
+            (address.to_string(), to_send),
+            (
+                client
+                    .get_new_address(None, None)?
+                    .assume_checked()
+                    .to_string(),
+                Amount::from_sat(change_amt),
+            ),
+        ]
+        .into();
+        let tx = client.create_raw_transaction(&[utxo], &out, None, None)?;
+        Ok::<_, anyhow::Error>(
+            client
+                .sign_raw_transaction_with_wallet(&tx, None, None)?
+                .transaction()?,
+        )
+    };
+
+    let tx_1 = make_tx(utxo_1, change_1)?;
+    let tx_2 = make_tx(utxo_2.clone(), change_2)?;
+
+    // 4. Mine up to height 103
+    println!("STEP: Mining to height 103");
+    while env.rpc_client().get_block_count()? < 103 {
+        let _ = env.mine_blocks(1, None)?;
+    }
+
+    // 5. Send tx1 and tx2, mine block A and block B
+    println!("STEP: Sending tx1 for block A");
+    let txid_a = client.send_raw_transaction(&tx_1)?;
+    let hash_104 = env.mine_blocks(1, None)?[0];
+
+    println!("STEP: Sending tx2 for block B");
+    let _txid_b = client.send_raw_transaction(&tx_2)?;
+    let hash_105 = env.mine_blocks(1, None)?[0];
+
+    // 6. Instantiate FilterIter and iterate once
+    println!("STEP: Instantiating FilterIter");
+    let mut iter = FilterIter::new_with_height(client, 104);
+    iter.add_spk(spk_to_watch.clone());
+    iter.get_tip()?;
+
+    println!("STEP: Iterating once (original block A)");
+    let event_a = iter.next().expect("Expected block A")?;
+    match event_a {
+        Event::Block(EventInner { height, block }) => {
+            assert_eq!(height, 104);
+            assert_eq!(block.block_hash(), hash_104);
+            assert!(block.txdata.iter().any(|tx| tx.compute_txid() == txid_a));
+        }
+        _ => panic!("Expected match in block A"),
+    }
+
+    // 7. Simulate reorg at height 105
+    println!("STEP: Invalidating original block B");
+    client.invalidate_block(&hash_105)?;
+
+    let unrelated_addr = client.get_new_address(None, None)?.assume_checked();
+    let input_amt = unspent[1].amount.to_sat();
+    let fee_sat = 2000;
+    let change_sat = input_amt - to_send.to_sat() - fee_sat;
+    assert!(change_sat > 500, "Change would be too small");
+
+    let change_addr = client.get_new_address(None, None)?.assume_checked();
+    let out = [
+        (unrelated_addr.to_string(), to_send),
+        (change_addr.to_string(), Amount::from_sat(change_sat)),
+    ]
+    .into();
+
+    let tx_ds = {
+        let tx = client.create_raw_transaction(&[utxo_2], &out, None, None)?;
+        let res = client.sign_raw_transaction_with_wallet(&tx, None, None)?;
+        res.transaction()?
+    };
+    client.send_raw_transaction(&tx_ds)?;
+
+    println!("STEP: Mining replacement block B'");
+    let _hash_105_prime = env.mine_blocks(1, None)?[0];
+    let new_tip = iter.get_tip()?.expect("Should have tip after reorg");
+    assert_eq!(new_tip.height, 105);
+    assert_ne!(new_tip.hash, hash_105, "BUG: still sees old block B");
+
+    // 8. Iterate again — should detect reorg and yield NoMatch for B'
+    println!("STEP: Iterating again (should detect reorg and yield B')");
+    let event_b_prime = iter.next().expect("Expected B'")?;
+    match event_b_prime {
+        Event::NoMatch(h) => {
+            assert_eq!(h, 105);
+        }
+        Event::Block(_) => panic!("Expected NoMatch for B' (replacement)"),
+    }
+
+    Ok(())
+}
+
 // Test that while a reorg is detected we delay incrementing the best height
 #[test]
 fn repeat_reorgs() -> anyhow::Result<()> {