bdk/crates/chain/tests/test_tx_graph.rs

#[macro_use]
mod common;
use bdk_chain::{
    collections::*,
    local_chain::LocalChain,
    tx_graph::{Additions, TxGraph},
    BlockId, ObservedAs,
};
use bitcoin::{
    hashes::Hash, BlockHash, OutPoint, PackedLockTime, Script, Transaction, TxIn, TxOut, Txid,
};
use core::iter;

#[test]
fn insert_txouts() {
    // 2 (Outpoint, TxOut) tupples that denotes original data in the graph, as partial transactions.
    let original_ops = [
        (
            OutPoint::new(h!("tx1"), 1),
            TxOut {
                value: 10_000,
                script_pubkey: Script::new(),
            },
        ),
        (
            OutPoint::new(h!("tx1"), 2),
            TxOut {
                value: 20_000,
                script_pubkey: Script::new(),
            },
        ),
    ];

    // Another (OutPoint, TxOut) tupple to be used as update as partial transaction.
    let update_ops = [(
        OutPoint::new(h!("tx2"), 0),
        TxOut {
            value: 20_000,
            script_pubkey: Script::new(),
        },
    )];

    // One full transaction to be included in the update
    let update_txs = Transaction {
        version: 0x01,
        lock_time: PackedLockTime(0),
        input: vec![TxIn {
            previous_output: OutPoint::null(),
            ..Default::default()
        }],
        output: vec![TxOut {
            value: 30_000,
            script_pubkey: Script::new(),
        }],
    };

    // Conf anchor used to mark the full transaction as confirmed.
    let conf_anchor = ObservedAs::Confirmed(BlockId {
        height: 100,
        hash: h!("random blockhash"),
    });

    // Unconfirmed anchor to mark the partial transactions as unconfirmed
    let unconf_anchor = ObservedAs::<BlockId>::Unconfirmed(1000000);

    // Make the original graph
    let mut graph = {
        let mut graph = TxGraph::<ObservedAs<BlockId>>::default();
        for (outpoint, txout) in &original_ops {
            assert_eq!(
                graph.insert_txout(*outpoint, txout.clone()),
                Additions {
                    txout: [(*outpoint, txout.clone())].into(),
                    ..Default::default()
                }
            );
        }
        graph
    };

    // Make the update graph
    let update = {
        let mut graph = TxGraph::default();
        for (outpoint, txout) in &update_ops {
            // Insert partials transactions
            assert_eq!(
                graph.insert_txout(*outpoint, txout.clone()),
                Additions {
                    txout: [(*outpoint, txout.clone())].into(),
                    ..Default::default()
                }
            );
            // Mark them unconfirmed.
            assert_eq!(
                graph.insert_anchor(outpoint.txid, unconf_anchor),
                Additions {
                    tx: [].into(),
                    txout: [].into(),
                    anchors: [(unconf_anchor, outpoint.txid)].into(),
                    last_seen: [].into()
                }
            );
            // Mark them last seen at.
            assert_eq!(
                graph.insert_seen_at(outpoint.txid, 1000000),
                Additions {
                    tx: [].into(),
                    txout: [].into(),
                    anchors: [].into(),
                    last_seen: [(outpoint.txid, 1000000)].into()
                }
            );
        }
        // Insert the full transaction
        assert_eq!(
            graph.insert_tx(update_txs.clone()),
            Additions {
                tx: [update_txs.clone()].into(),
                ..Default::default()
            }
        );

        // Mark it as confirmed.
        assert_eq!(
            graph.insert_anchor(update_txs.txid(), conf_anchor),
            Additions {
                tx: [].into(),
                txout: [].into(),
                anchors: [(conf_anchor, update_txs.txid())].into(),
                last_seen: [].into()
            }
        );
        graph
    };

    // Check the resulting addition.
    let additions = graph.determine_additions(&update);

    assert_eq!(
        additions,
        Additions {
            tx: [update_txs.clone()].into(),
            txout: update_ops.into(),
            anchors: [(conf_anchor, update_txs.txid()), (unconf_anchor, h!("tx2"))].into(),
            last_seen: [(h!("tx2"), 1000000)].into()
        }
    );

    // Apply addition and check the new graph counts.
    graph.apply_additions(additions);
    assert_eq!(graph.all_txouts().count(), 4);
    assert_eq!(graph.full_txs().count(), 1);
    assert_eq!(graph.floating_txouts().count(), 3);

    // Check TxOuts are fetched correctly from the graph.
    assert_eq!(
        graph.tx_outputs(h!("tx1")).expect("should exists"),
        [
            (
                1u32,
                &TxOut {
                    value: 10_000,
                    script_pubkey: Script::new(),
                }
            ),
            (
                2u32,
                &TxOut {
                    value: 20_000,
                    script_pubkey: Script::new(),
                }
            )
        ]
        .into()
    );

    assert_eq!(
        graph.tx_outputs(update_txs.txid()).expect("should exists"),
        [(
            0u32,
            &TxOut {
                value: 30_000,
                script_pubkey: Script::new()
            }
        )]
        .into()
    );
}

#[test]
fn insert_tx_graph_doesnt_count_coinbase_as_spent() {
    let tx = Transaction {
        version: 0x01,
        lock_time: PackedLockTime(0),
        input: vec![TxIn {
            previous_output: OutPoint::null(),
            ..Default::default()
        }],
        output: vec![],
    };

    let mut graph = TxGraph::<()>::default();
    let _ = graph.insert_tx(tx);
    assert!(graph.output_spends(OutPoint::null()).is_empty());
    assert!(graph.tx_spends(Txid::all_zeros()).next().is_none());
}

#[test]
fn insert_tx_graph_keeps_track_of_spend() {
    let tx1 = Transaction {
        version: 0x01,
        lock_time: PackedLockTime(0),
        input: vec![],
        output: vec![TxOut::default()],
    };

    let op = OutPoint {
        txid: tx1.txid(),
        vout: 0,
    };

    let tx2 = Transaction {
        version: 0x01,
        lock_time: PackedLockTime(0),
        input: vec![TxIn {
            previous_output: op,
            ..Default::default()
        }],
        output: vec![],
    };

    let mut graph1 = TxGraph::<()>::default();
    let mut graph2 = TxGraph::<()>::default();

    // insert in different order
    let _ = graph1.insert_tx(tx1.clone());
    let _ = graph1.insert_tx(tx2.clone());

    let _ = graph2.insert_tx(tx2.clone());
    let _ = graph2.insert_tx(tx1);

    assert_eq!(
        graph1.output_spends(op),
        &iter::once(tx2.txid()).collect::<HashSet<_>>()
    );
    assert_eq!(graph2.output_spends(op), graph1.output_spends(op));
}

#[test]
fn insert_tx_can_retrieve_full_tx_from_graph() {
    let tx = Transaction {
        version: 0x01,
        lock_time: PackedLockTime(0),
        input: vec![TxIn {
            previous_output: OutPoint::null(),
            ..Default::default()
        }],
        output: vec![TxOut::default()],
    };

    let mut graph = TxGraph::<()>::default();
    let _ = graph.insert_tx(tx.clone());
    assert_eq!(graph.get_tx(tx.txid()), Some(&tx));
}

#[test]
fn insert_tx_displaces_txouts() {
    let mut tx_graph = TxGraph::<()>::default();
    let tx = Transaction {
        version: 0x01,
        lock_time: PackedLockTime(0),
        input: vec![],
        output: vec![TxOut {
            value: 42_000,
            script_pubkey: Script::default(),
        }],
    };

    let _ = tx_graph.insert_txout(
        OutPoint {
            txid: tx.txid(),
            vout: 0,
        },
        TxOut {
            value: 1_337_000,
            script_pubkey: Script::default(),
        },
    );

    let _ = tx_graph.insert_txout(
        OutPoint {
            txid: tx.txid(),
            vout: 0,
        },
        TxOut {
            value: 1_000_000_000,
            script_pubkey: Script::default(),
        },
    );

    let _additions = tx_graph.insert_tx(tx.clone());

    assert_eq!(
        tx_graph
            .get_txout(OutPoint {
                txid: tx.txid(),
                vout: 0
            })
            .unwrap()
            .value,
        42_000
    );
    assert_eq!(
        tx_graph.get_txout(OutPoint {
            txid: tx.txid(),
            vout: 1
        }),
        None
    );
}

#[test]
fn insert_txout_does_not_displace_tx() {
    let mut tx_graph = TxGraph::<()>::default();
    let tx = Transaction {
        version: 0x01,
        lock_time: PackedLockTime(0),
        input: vec![],
        output: vec![TxOut {
            value: 42_000,
            script_pubkey: Script::default(),
        }],
    };

    let _additions = tx_graph.insert_tx(tx.clone());

    let _ = tx_graph.insert_txout(
        OutPoint {
            txid: tx.txid(),
            vout: 0,
        },
        TxOut {
            value: 1_337_000,
            script_pubkey: Script::default(),
        },
    );

    let _ = tx_graph.insert_txout(
        OutPoint {
            txid: tx.txid(),
            vout: 0,
        },
        TxOut {
            value: 1_000_000_000,
            script_pubkey: Script::default(),
        },
    );

    assert_eq!(
        tx_graph
            .get_txout(OutPoint {
                txid: tx.txid(),
                vout: 0
            })
            .unwrap()
            .value,
        42_000
    );
    assert_eq!(
        tx_graph.get_txout(OutPoint {
            txid: tx.txid(),
            vout: 1
        }),
        None
    );
}

#[test]
fn test_calculate_fee() {
    let mut graph = TxGraph::<()>::default();
    let intx1 = Transaction {
        version: 0x01,
        lock_time: PackedLockTime(0),
        input: vec![],
        output: vec![TxOut {
            value: 100,
            ..Default::default()
        }],
    };
    let intx2 = Transaction {
        version: 0x02,
        lock_time: PackedLockTime(0),
        input: vec![],
        output: vec![TxOut {
            value: 200,
            ..Default::default()
        }],
    };

    let intxout1 = (
        OutPoint {
            txid: h!("dangling output"),
            vout: 0,
        },
        TxOut {
            value: 300,
            ..Default::default()
        },
    );

    let _ = graph.insert_tx(intx1.clone());
    let _ = graph.insert_tx(intx2.clone());
    let _ = graph.insert_txout(intxout1.0, intxout1.1);

    let mut tx = Transaction {
        version: 0x01,
        lock_time: PackedLockTime(0),
        input: vec![
            TxIn {
                previous_output: OutPoint {
                    txid: intx1.txid(),
                    vout: 0,
                },
                ..Default::default()
            },
            TxIn {
                previous_output: OutPoint {
                    txid: intx2.txid(),
                    vout: 0,
                },
                ..Default::default()
            },
            TxIn {
                previous_output: intxout1.0,
                ..Default::default()
            },
        ],
        output: vec![TxOut {
            value: 500,
            ..Default::default()
        }],
    };

    assert_eq!(graph.calculate_fee(&tx), Some(100));

    tx.input.remove(2);

    // fee would be negative
    assert_eq!(graph.calculate_fee(&tx), Some(-200));

    // If we have an unknown outpoint, fee should return None.
    tx.input.push(TxIn {
        previous_output: OutPoint {
            txid: h!("unknown_txid"),
            vout: 0,
        },
        ..Default::default()
    });
    assert_eq!(graph.calculate_fee(&tx), None);
}

#[test]
fn test_calculate_fee_on_coinbase() {
    let tx = Transaction {
        version: 0x01,
        lock_time: PackedLockTime(0),
        input: vec![TxIn {
            previous_output: OutPoint::null(),
            ..Default::default()
        }],
        output: vec![TxOut::default()],
    };

    let graph = TxGraph::<()>::default();

    assert_eq!(graph.calculate_fee(&tx), Some(0));
}

#[test]
fn test_conflicting_descendants() {
    let previous_output = OutPoint::new(h!("op"), 2);

    // tx_a spends previous_output
    let tx_a = Transaction {
        input: vec![TxIn {
            previous_output,
            ..TxIn::default()
        }],
        output: vec![TxOut::default()],
        ..common::new_tx(0)
    };

    // tx_a2 spends previous_output and conflicts with tx_a
    let tx_a2 = Transaction {
        input: vec![TxIn {
            previous_output,
            ..TxIn::default()
        }],
        output: vec![TxOut::default(), TxOut::default()],
        ..common::new_tx(1)
    };

    // tx_b spends tx_a
    let tx_b = Transaction {
        input: vec![TxIn {
            previous_output: OutPoint::new(tx_a.txid(), 0),
            ..TxIn::default()
        }],
        output: vec![TxOut::default()],
        ..common::new_tx(2)
    };

    let txid_a = tx_a.txid();
    let txid_b = tx_b.txid();

    let mut graph = TxGraph::<()>::default();
    let _ = graph.insert_tx(tx_a);
    let _ = graph.insert_tx(tx_b);

    assert_eq!(
        graph
            .walk_conflicts(&tx_a2, |depth, txid| Some((depth, txid)))
            .collect::<Vec<_>>(),
        vec![(0_usize, txid_a), (1_usize, txid_b),],
    );
}

#[test]
fn test_descendants_no_repeat() {
    let tx_a = Transaction {
        output: vec![TxOut::default(), TxOut::default(), TxOut::default()],
        ..common::new_tx(0)
    };

    let txs_b = (0..3)
        .map(|vout| Transaction {
            input: vec![TxIn {
                previous_output: OutPoint::new(tx_a.txid(), vout),
                ..TxIn::default()
            }],
            output: vec![TxOut::default()],
            ..common::new_tx(1)
        })
        .collect::<Vec<_>>();

    let txs_c = (0..2)
        .map(|vout| Transaction {
            input: vec![TxIn {
                previous_output: OutPoint::new(txs_b[vout as usize].txid(), vout),
                ..TxIn::default()
            }],
            output: vec![TxOut::default()],
            ..common::new_tx(2)
        })
        .collect::<Vec<_>>();

    let tx_d = Transaction {
        input: vec![
            TxIn {
                previous_output: OutPoint::new(txs_c[0].txid(), 0),
                ..TxIn::default()
            },
            TxIn {
                previous_output: OutPoint::new(txs_c[1].txid(), 0),
                ..TxIn::default()
            },
        ],
        output: vec![TxOut::default()],
        ..common::new_tx(3)
    };

    let tx_e = Transaction {
        input: vec![TxIn {
            previous_output: OutPoint::new(tx_d.txid(), 0),
            ..TxIn::default()
        }],
        output: vec![TxOut::default()],
        ..common::new_tx(4)
    };

    let txs_not_connected = (10..20)
        .map(|v| Transaction {
            input: vec![TxIn {
                previous_output: OutPoint::new(h!("tx_does_not_exist"), v),
                ..TxIn::default()
            }],
            output: vec![TxOut::default()],
            ..common::new_tx(v)
        })
        .collect::<Vec<_>>();

    let mut graph = TxGraph::<()>::default();
    let mut expected_txids = BTreeSet::new();

    // these are NOT descendants of `tx_a`
    for tx in txs_not_connected {
        let _ = graph.insert_tx(tx.clone());
    }

    // these are the expected descendants of `tx_a`
    for tx in txs_b
        .iter()
        .chain(&txs_c)
        .chain(core::iter::once(&tx_d))
        .chain(core::iter::once(&tx_e))
    {
        let _ = graph.insert_tx(tx.clone());
        assert!(expected_txids.insert(tx.txid()));
    }

    let descendants = graph
        .walk_descendants(tx_a.txid(), |_, txid| Some(txid))
        .collect::<Vec<_>>();

    assert_eq!(descendants.len(), expected_txids.len());

    for txid in descendants {
        assert!(expected_txids.remove(&txid));
    }
    assert!(expected_txids.is_empty());
}

#[test]
fn test_chain_spends() {
    let local_chain: LocalChain = (0..=100)
        .map(|ht| (ht, BlockHash::hash(format!("Block Hash {}", ht).as_bytes())))
        .collect::<BTreeMap<u32, BlockHash>>()
        .into();
    let tip = local_chain.tip().expect("must have tip");

    // The parent tx contains 2 outputs. Which are spent by one confirmed and one unconfirmed tx.
    // The parent tx is confirmed at block 95.
    let tx_0 = Transaction {
        input: vec![],
        output: vec![
            TxOut {
                value: 10_000,
                script_pubkey: Script::new(),
            },
            TxOut {
                value: 20_000,
                script_pubkey: Script::new(),
            },
        ],
        ..common::new_tx(0)
    };

    // The first confirmed transaction spends vout: 0. And is confirmed at block 98.
    let tx_1 = Transaction {
        input: vec![TxIn {
            previous_output: OutPoint::new(tx_0.txid(), 0),
            ..TxIn::default()
        }],
        output: vec![
            TxOut {
                value: 5_000,
                script_pubkey: Script::new(),
            },
            TxOut {
                value: 5_000,
                script_pubkey: Script::new(),
            },
        ],
        ..common::new_tx(0)
    };

    // The second transactions spends vout:1, and is unconfirmed.
    let tx_2 = Transaction {
        input: vec![TxIn {
            previous_output: OutPoint::new(tx_0.txid(), 1),
            ..TxIn::default()
        }],
        output: vec![
            TxOut {
                value: 10_000,
                script_pubkey: Script::new(),
            },
            TxOut {
                value: 10_000,
                script_pubkey: Script::new(),
            },
        ],
        ..common::new_tx(0)
    };

    let mut graph = TxGraph::<BlockId>::default();

    let _ = graph.insert_tx(tx_0.clone());
    let _ = graph.insert_tx(tx_1.clone());
    let _ = graph.insert_tx(tx_2.clone());

    [95, 98]
        .iter()
        .zip([&tx_0, &tx_1].into_iter())
        .for_each(|(ht, tx)| {
            let block_id = local_chain.get_block(*ht).expect("block expected");
            let _ = graph.insert_anchor(tx.txid(), block_id);
        });

    // Assert that confirmed spends are returned correctly.
    assert_eq!(
        graph
            .get_chain_spend(&local_chain, tip, OutPoint::new(tx_0.txid(), 0))
            .unwrap(),
        (
            ObservedAs::Confirmed(&local_chain.get_block(98).expect("block expected")),
            tx_1.txid()
        )
    );

    // Check if chain position is returned correctly.
    assert_eq!(
        graph
            .get_chain_position(&local_chain, tip, tx_0.txid())
            .expect("position expected"),
        ObservedAs::Confirmed(&local_chain.get_block(95).expect("block expected"))
    );

    // As long the unconfirmed tx isn't marked as seen, chain_spend will return None.
    assert!(graph
        .get_chain_spend(&local_chain, tip, OutPoint::new(tx_0.txid(), 1))
        .is_none());

    // Mark the unconfirmed as seen and check correct ObservedAs status is returned.
    let _ = graph.insert_seen_at(tx_2.txid(), 1234567);

    // Check chain spend returned correctly.
    assert_eq!(
        graph
            .get_chain_spend(&local_chain, tip, OutPoint::new(tx_0.txid(), 1))
            .unwrap(),
        (ObservedAs::Unconfirmed(1234567), tx_2.txid())
    );

    // A conflicting transaction that conflicts with tx_1.
    let tx_1_conflict = Transaction {
        input: vec![TxIn {
            previous_output: OutPoint::new(tx_0.txid(), 0),
            ..Default::default()
        }],
        ..common::new_tx(0)
    };
    let _ = graph.insert_tx(tx_1_conflict.clone());

    // Because this tx conflicts with an already confirmed transaction, chain position should return none.
    assert!(graph
        .get_chain_position(&local_chain, tip, tx_1_conflict.txid())
        .is_none());

    // Another conflicting tx that conflicts with tx_2.
    let tx_2_conflict = Transaction {
        input: vec![TxIn {
            previous_output: OutPoint::new(tx_0.txid(), 1),
            ..Default::default()
        }],
        ..common::new_tx(0)
    };

    // Insert in graph and mark it as seen.
    let _ = graph.insert_tx(tx_2_conflict.clone());
    let _ = graph.insert_seen_at(tx_2_conflict.txid(), 1234568);

    // This should return a valid observation with correct last seen.
    assert_eq!(
        graph
            .get_chain_position(&local_chain, tip, tx_2_conflict.txid())
            .expect("position expected"),
        ObservedAs::Unconfirmed(1234568)
    );

    // Chain_spend now catches the new transaction as the spend.
    assert_eq!(
        graph
            .get_chain_spend(&local_chain, tip, OutPoint::new(tx_0.txid(), 1))
            .expect("expect observation"),
        (ObservedAs::Unconfirmed(1234568), tx_2_conflict.txid())
    );

    // Chain position of the `tx_2` is now none, as it is older than `tx_2_conflict`
    assert!(graph
        .get_chain_position(&local_chain, tip, tx_2.txid())
        .is_none());
}