git.bitcoin.ninja Git - rust-lightning/blob - src/util/transaction_utils.rs

   1 use bitcoin::blockdata::transaction::TxOut;
   2
   3 use std::cmp::Ordering;
   4
   5 pub fn sort_outputs<T, C : Fn(&T, &T) -> Ordering>(outputs: &mut Vec<(TxOut, T)>, tie_breaker: C) {
   6         outputs.sort_unstable_by(|a, b| {
   7                 a.0.value.cmp(&b.0.value).then_with(|| {
   8                         a.0.script_pubkey[..].cmp(&b.0.script_pubkey[..]).then_with(|| {
   9                                 tie_breaker(&a.1, &b.1)
  10                         })
  11                 })
  12         });
  13 }
  14
  15 #[cfg(test)]
  16 mod tests {
  17         use super::*;
  18
  19         use bitcoin::blockdata::script::{Script, Builder};
  20         use bitcoin::blockdata::transaction::TxOut;
  21
  22         use hex::decode;
  23
  24         #[test]
  25         fn sort_output_by_value() {
  26                 let txout1 = TxOut {
  27                         value:  100,
  28                         script_pubkey: Builder::new().push_int(0).into_script()
  29                 };
  30                 let txout1_ = txout1.clone();
  31
  32                 let txout2 = TxOut {
  33                         value: 99,
  34                         script_pubkey: Builder::new().push_int(0).into_script()
  35                 };
  36                 let txout2_ = txout2.clone();
  37
  38                 let mut outputs = vec![(txout1, "ignore"), (txout2, "ignore")];
  39                 sort_outputs(&mut outputs, |_, _| { unreachable!(); });
  40
  41                 assert_eq!(
  42                         &outputs,
  43                         &vec![(txout2_, "ignore"), (txout1_, "ignore")]
  44                         );
  45         }
  46
  47         #[test]
  48         fn sort_output_by_script_pubkey() {
  49                 let txout1 = TxOut {
  50                         value:  100,
  51                         script_pubkey: Builder::new().push_int(3).into_script(),
  52                 };
  53                 let txout1_ = txout1.clone();
  54
  55                 let txout2 = TxOut {
  56                         value: 100,
  57                         script_pubkey: Builder::new().push_int(1).push_int(2).into_script()
  58                 };
  59                 let txout2_ = txout2.clone();
  60
  61                 let mut outputs = vec![(txout1, "ignore"), (txout2, "ignore")];
  62                 sort_outputs(&mut outputs, |_, _| { unreachable!(); });
  63
  64                 assert_eq!(
  65                         &outputs,
  66                         &vec![(txout2_, "ignore"), (txout1_, "ignore")]
  67                         );
  68         }
  69
  70         #[test]
  71         fn sort_output_by_bip_test() {
  72                 let txout1 = TxOut {
  73                         value: 100000000,
  74                         script_pubkey: script_from_hex("41046a0765b5865641ce08dd39690aade26dfbf5511430ca428a3089261361cef170e3929a68aee3d8d4848b0c5111b0a37b82b86ad559fd2a745b44d8e8d9dfdc0cac")
  75                 };
  76                 let txout1_ = txout1.clone();
  77
  78                 // doesn't deserialize cleanly:
  79                 let txout2 = TxOut {
  80                         value: 2400000000,
  81                         script_pubkey: script_from_hex("41044a656f065871a353f216ca26cef8dde2f03e8c16202d2e8ad769f02032cb86a5eb5e56842e92e19141d60a01928f8dd2c875a390f67c1f6c94cfc617c0ea45afac")
  82                 };
  83                 let txout2_ = txout2.clone();
  84
  85                 let mut outputs = vec![(txout1, "ignore"), (txout2, "ignore")];
  86                 sort_outputs(&mut outputs, |_, _| { unreachable!(); });
  87
  88                 assert_eq!(&outputs, &vec![(txout1_, "ignore"), (txout2_, "ignore")]);
  89         }
  90
  91         fn script_from_hex(hex_str: &str) -> Script {
  92                 Script::from(decode(hex_str).unwrap())
  93         }
  94
  95         macro_rules! bip_txout_tests {
  96                 ($($name:ident: $value:expr,)*) => {
  97                         $(
  98                                 #[test]
  99                                 fn $name() {
 100                                         let expected_raw: Vec<(u64, &str)> = $value;
 101                                         let expected: Vec<(TxOut, &str)> = expected_raw.iter()
 102                                                 .map(|txout_raw| TxOut {
 103                                                         value: txout_raw.0,
 104                                                         script_pubkey: script_from_hex(txout_raw.1)
 105                                                 }).map(|txout| (txout, "ignore"))
 106                                         .collect();
 107
 108                                         let mut outputs = expected.clone();
 109                                         outputs.reverse(); // prep it
 110
 111                                         // actually do the work!
 112                                         sort_outputs(&mut outputs, |_, _| { unreachable!(); });
 113
 114                                         assert_eq!(outputs, expected);
 115                                 }
 116                         )*
 117                 }
 118         }
 119
 120         const TXOUT1: [(u64, &str); 2] = [
 121                 (400057456, "76a9144a5fba237213a062f6f57978f796390bdcf8d01588ac"),
 122                 (40000000000, "76a9145be32612930b8323add2212a4ec03c1562084f8488ac"),
 123         ];
 124         const TXOUT2: [(u64, &str); 2] = [
 125                 (100000000, "41046a0765b5865641ce08dd39690aade26dfbf5511430ca428a3089261361cef170e3929a68aee3d8d4848b0c5111b0a37b82b86ad559fd2a745b44d8e8d9dfdc0cac"),
 126                 (2400000000, "41044a656f065871a353f216ca26cef8dde2f03e8c16202d2e8ad769f02032cb86a5eb5e56842e92e19141d60a01928f8dd2c875a390f67c1f6c94cfc617c0ea45afac"),
 127         ];
 128         bip_txout_tests! {
 129                 bip69_txout_test_1: TXOUT1.to_vec(),
 130                 bip69_txout_test_2: TXOUT2.to_vec(),
 131         }
 132 }