1 //! Contains simple structs describing parts of transactions on the chain.
3 use bitcoin::hash_types::Txid;
4 use bitcoin::blockdata::transaction::OutPoint as BitcoinOutPoint;
6 /// A reference to a transaction output.
8 /// Differs from bitcoin::blockdata::transaction::OutPoint as the index is a u16 instead of u32
9 /// due to LN's restrictions on index values. Should reduce (possibly) unsafe conversions this way.
10 #[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Debug, Hash)]
12 /// The referenced transaction's txid.
14 /// The index of the referenced output in its transaction's vout.
19 /// Convert an `OutPoint` to a lightning channel id.
20 pub fn to_channel_id(&self) -> [u8; 32] {
21 let mut res = [0; 32];
22 res[..].copy_from_slice(&self.txid[..]);
23 res[30] ^= ((self.index >> 8) & 0xff) as u8;
24 res[31] ^= ((self.index >> 0) & 0xff) as u8;
28 /// Converts this OutPoint into the OutPoint field as used by rust-bitcoin
29 pub fn into_bitcoin_outpoint(self) -> BitcoinOutPoint {
32 vout: self.index as u32,
37 impl_writeable!(OutPoint, 0, { txid, index });
41 use chain::transaction::OutPoint;
43 use bitcoin::blockdata::transaction::Transaction;
44 use bitcoin::consensus::encode;
49 fn test_channel_id_calculation() {
50 let tx: Transaction = encode::deserialize(&hex::decode("020000000001010e0adef48412e4361325ac1c6e36411299ab09d4f083b9d8ddb55fbc06e1b0c00000000000feffffff0220a1070000000000220020f81d95e040bd0a493e38bae27bff52fe2bb58b93b293eb579c01c31b05c5af1dc072cfee54a3000016001434b1d6211af5551905dc2642d05f5b04d25a8fe80247304402207f570e3f0de50546aad25a872e3df059d277e776dda4269fa0d2cc8c2ee6ec9a022054e7fae5ca94d47534c86705857c24ceea3ad51c69dd6051c5850304880fc43a012103cb11a1bacc223d98d91f1946c6752e358a5eb1a1c983b3e6fb15378f453b76bd00000000").unwrap()[..]).unwrap();
51 assert_eq!(&OutPoint {
54 }.to_channel_id(), &hex::decode("3e88dd7165faf7be58b3c5bb2c9c452aebef682807ea57080f62e6f6e113c25e").unwrap()[..]);
55 assert_eq!(&OutPoint {
58 }.to_channel_id(), &hex::decode("3e88dd7165faf7be58b3c5bb2c9c452aebef682807ea57080f62e6f6e113c25f").unwrap()[..]);