Feature: Count sigops for Transaction
Co-authored-by: Tobin C. Harding <me@tobin.cc>
This commit is contained in:
junderw
parent
c32c7d1611
commit
158ba26a8a
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@ -9,6 +9,7 @@ use core::ops::{Index, Range, RangeFrom, RangeFull, RangeInclusive, RangeTo, Ran
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use hashes::Hash;
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use hashes::Hash;
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use secp256k1::{Secp256k1, Verification};
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use secp256k1::{Secp256k1, Verification};
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use super::PushBytes;
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use crate::blockdata::opcodes::all::*;
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use crate::blockdata::opcodes::all::*;
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use crate::blockdata::opcodes::{self, Opcode};
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use crate::blockdata::opcodes::{self, Opcode};
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use crate::blockdata::script::witness_version::WitnessVersion;
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use crate::blockdata::script::witness_version::WitnessVersion;
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@ -207,6 +208,25 @@ impl Script {
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&& self.0[24] == OP_CHECKSIG.to_u8()
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&& self.0[24] == OP_CHECKSIG.to_u8()
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}
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}
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/// Checks whether a script is push only.
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///
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/// Note: `OP_RESERVED` (`0x50`) and all the OP_PUSHNUM operations
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/// are considered push operations.
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#[inline]
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pub fn is_push_only(&self) -> bool {
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for inst in self.instructions() {
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match inst {
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Err(_) => return false,
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Ok(Instruction::PushBytes(_)) => {}
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Ok(Instruction::Op(op)) if op.to_u8() <= 0x60 => {}
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// From Bitcoin Core
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// if (opcode > OP_PUSHNUM_16 (0x60)) return false
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Ok(Instruction::Op(_)) => return false,
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}
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}
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true
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}
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/// Checks whether a script pubkey is a P2PK output.
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/// Checks whether a script pubkey is a P2PK output.
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///
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///
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/// You can obtain the public key, if its valid,
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/// You can obtain the public key, if its valid,
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@ -459,6 +479,7 @@ impl Script {
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match inst {
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match inst {
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Ok(Instruction::Op(opcode)) => {
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Ok(Instruction::Op(opcode)) => {
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match opcode {
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match opcode {
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// p2pk, p2pkh
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OP_CHECKSIG | OP_CHECKSIGVERIFY => {
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OP_CHECKSIG | OP_CHECKSIGVERIFY => {
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n += 1;
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n += 1;
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}
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}
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@ -567,6 +588,29 @@ impl Script {
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}
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}
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}
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}
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/// Iterates the script to find the last pushdata.
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///
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/// Returns `None` if the instruction is an opcode or if the script is empty.
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pub(crate) fn last_pushdata(&self) -> Option<Push> {
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match self.instructions().last() {
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// Handles op codes up to (but excluding) OP_PUSHNUM_NEG.
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Some(Ok(Instruction::PushBytes(bytes))) => Some(Push::Data(bytes)),
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// OP_16 (0x60) and lower are considered "pushes" by Bitcoin Core (excl. OP_RESERVED).
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// By here we know that op is between OP_PUSHNUM_NEG AND OP_PUSHNUM_16 inclusive.
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Some(Ok(Instruction::Op(op))) if op.to_u8() <= 0x60 => {
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if op == OP_PUSHNUM_NEG1 {
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Some(Push::Num(-1))
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} else if op == OP_RESERVED {
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Some(Push::Reserved)
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} else {
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let num = (op.to_u8() - 0x50) as i8; // cast ok, num is [1, 16].
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Some(Push::Num(num))
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}
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}
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_ => None,
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}
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}
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/// Converts a [`Box<Script>`](Box) into a [`ScriptBuf`] without copying or allocating.
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/// Converts a [`Box<Script>`](Box) into a [`ScriptBuf`] without copying or allocating.
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#[must_use = "`self` will be dropped if the result is not used"]
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#[must_use = "`self` will be dropped if the result is not used"]
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pub fn into_script_buf(self: Box<Self>) -> ScriptBuf {
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pub fn into_script_buf(self: Box<Self>) -> ScriptBuf {
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@ -580,6 +624,19 @@ impl Script {
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}
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}
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}
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}
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/// Data pushed by "push" opcodes.
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///
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/// "push" opcodes are defined by Bitcoin Core as OP_PUSHBYTES_, OP_PUSHDATA, OP_PUSHNUM_, and
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/// OP_RESERVED i.e., everything less than OP_PUSHNUM_16 (0x60) . (TODO: Add link to core code).
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pub(crate) enum Push<'a> {
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/// All the OP_PUSHBYTES_ and OP_PUSHDATA_ opcodes.
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Data(&'a PushBytes),
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/// All the OP_PUSHNUM_ opcodes (-1, 1, 2, .., 16)
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Num(i8),
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/// OP_RESERVED
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Reserved,
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}
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/// Iterator over bytes of a script
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/// Iterator over bytes of a script
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pub struct Bytes<'a>(core::iter::Copied<core::slice::Iter<'a, u8>>);
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pub struct Bytes<'a>(core::iter::Copied<core::slice::Iter<'a, u8>>);
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@ -21,7 +21,7 @@ use internals::write_err;
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use super::Weight;
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use super::Weight;
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use crate::blockdata::locktime::absolute::{self, Height, Time};
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use crate::blockdata::locktime::absolute::{self, Height, Time};
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use crate::blockdata::locktime::relative;
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use crate::blockdata::locktime::relative;
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use crate::blockdata::script::ScriptBuf;
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use crate::blockdata::script::{Script, ScriptBuf};
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use crate::blockdata::witness::Witness;
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use crate::blockdata::witness::Witness;
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#[cfg(feature = "bitcoinconsensus")]
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#[cfg(feature = "bitcoinconsensus")]
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pub use crate::consensus::validation::TxVerifyError;
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pub use crate::consensus::validation::TxVerifyError;
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@ -30,6 +30,7 @@ use crate::hash_types::{Txid, Wtxid};
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use crate::internal_macros::impl_consensus_encoding;
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use crate::internal_macros::impl_consensus_encoding;
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use crate::parse::impl_parse_str_from_int_infallible;
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use crate::parse::impl_parse_str_from_int_infallible;
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use crate::prelude::*;
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use crate::prelude::*;
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use crate::script::Push;
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#[cfg(doc)]
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#[cfg(doc)]
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use crate::sighash::{EcdsaSighashType, TapSighashType};
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use crate::sighash::{EcdsaSighashType, TapSighashType};
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use crate::string::FromHexStr;
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use crate::string::FromHexStr;
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@ -833,6 +834,122 @@ impl Transaction {
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pub fn script_pubkey_lens(&self) -> impl Iterator<Item = usize> + '_ {
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pub fn script_pubkey_lens(&self) -> impl Iterator<Item = usize> + '_ {
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self.output.iter().map(|txout| txout.script_pubkey.len())
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self.output.iter().map(|txout| txout.script_pubkey.len())
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}
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}
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/// Counts the total number of sigops.
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///
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/// This value is for pre-taproot transactions only.
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///
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/// > In taproot, a different mechanism is used. Instead of having a global per-block limit,
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/// > there is a per-transaction-input limit, proportional to the size of that input.
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/// > ref: <https://bitcoin.stackexchange.com/questions/117356/what-is-sigop-signature-operation#117359>
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///
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/// The `spent` parameter is a closure/function that looks up the output being spent by each input
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/// It takes in an [`OutPoint`] and returns a [`TxOut`]. If you can't provide this, a placeholder of
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/// `|_| None` can be used. Without access to the previous [`TxOut`], any sigops in a redeemScript (P2SH)
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/// as well as any segwit sigops will not be counted for that input.
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pub fn total_sigop_cost<S>(&self, mut spent: S) -> usize
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where
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S: FnMut(&OutPoint) -> Option<TxOut>,
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{
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let mut cost = self.count_p2pk_p2pkh_sigops().saturating_mul(4);
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// coinbase tx is correctly handled because `spent` will always returns None.
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cost = cost.saturating_add(self.count_p2sh_sigops(&mut spent).saturating_mul(4));
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cost.saturating_add(self.count_witness_sigops(&mut spent))
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}
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/// Gets the sigop count.
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///
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/// Counts sigops for this transaction's input scriptSigs and output scriptPubkeys i.e., doesn't
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/// count sigops in the redeemScript for p2sh or the sigops in the witness (use
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/// `count_p2sh_sigops` and `count_witness_sigops` respectively).
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fn count_p2pk_p2pkh_sigops(&self) -> usize {
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let mut count: usize = 0;
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for input in &self.input {
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// 0 for p2wpkh, p2wsh, and p2sh (including wrapped segwit).
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count = count.saturating_add(input.script_sig.count_sigops_legacy());
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}
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for output in &self.output {
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count = count.saturating_add(output.script_pubkey.count_sigops_legacy());
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}
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count
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}
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/// Does not include wrapped segwit (see `count_witness_sigops`).
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fn count_p2sh_sigops<S>(&self, spent: &mut S) -> usize
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where
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S: FnMut(&OutPoint) -> Option<TxOut>,
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{
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fn count_sigops(prevout: &TxOut, input: &TxIn) -> usize {
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let mut count: usize = 0;
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if prevout.script_pubkey.is_p2sh() {
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if let Some(Push::Data(redeem)) = input.script_sig.last_pushdata() {
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count =
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count.saturating_add(Script::from_bytes(redeem.as_bytes()).count_sigops());
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}
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}
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count
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}
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let mut count: usize = 0;
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for input in &self.input {
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if let Some(prevout) = spent(&input.previous_output) {
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count = count.saturating_add(count_sigops(&prevout, input));
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}
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}
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count
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}
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/// Includes wrapped segwit (returns 0 for taproot spends).
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fn count_witness_sigops<S>(&self, spent: &mut S) -> usize
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where
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S: FnMut(&OutPoint) -> Option<TxOut>,
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{
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fn count_sigops_with_witness_program(witness: &Witness, witness_program: &Script) -> usize {
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if witness_program.is_p2wpkh() {
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1
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} else if witness_program.is_p2wsh() {
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// Treat the last item of the witness as the witnessScript
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return witness
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.last()
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.map(Script::from_bytes)
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.map(|s| s.count_sigops())
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.unwrap_or(0);
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} else {
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0
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}
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}
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fn count_sigops(prevout: TxOut, input: &TxIn) -> usize {
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let script_sig = &input.script_sig;
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let witness = &input.witness;
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let witness_program = if prevout.script_pubkey.is_witness_program() {
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&prevout.script_pubkey
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} else if prevout.script_pubkey.is_p2sh() && script_sig.is_push_only() {
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// If prevout is P2SH and scriptSig is push only
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// then we wrap the last push (redeemScript) in a Script
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if let Some(Push::Data(push_bytes)) = script_sig.last_pushdata() {
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Script::from_bytes(push_bytes.as_bytes())
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} else {
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return 0;
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}
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} else {
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return 0;
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};
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// This will return 0 if the redeemScript wasn't a witness program
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count_sigops_with_witness_program(witness, witness_program)
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}
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let mut count: usize = 0;
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for input in &self.input {
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if let Some(prevout) = spent(&input.previous_output) {
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count = count.saturating_add(count_sigops(prevout, input));
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}
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}
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count
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}
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}
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}
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impl_consensus_encoding!(TxOut, value, script_pubkey);
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impl_consensus_encoding!(TxOut, value, script_pubkey);
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@ -1803,6 +1920,154 @@ mod tests {
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assert_eq!(tx.weight(), *expected_weight);
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assert_eq!(tx.weight(), *expected_weight);
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}
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}
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}
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}
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#[test]
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fn tx_sigop_count() {
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let tx_hexes = [
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// 0 sigops (p2pkh in + p2wpkh out)
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(
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"0200000001725aab4d23f76ad10bb569a68f8702ebfb8b076e015179ff9b9425234953\
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ac63000000006a47304402204cae7dc9bb68b588dd6b8afb8b881b752fd65178c25693e\
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a6d5d9a08388fd2a2022011c753d522d5c327741a6d922342c86e05c928309d7e566f68\
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8148432e887028012103f14b11cfb58b113716e0fa277ab4a32e4d3ed64c6b09b1747ef\
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7c828d5b06a94fdffffff01e5d4830100000000160014e98527b55cae861e5b9c3a6794\
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86514c012d6fce00000000",
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0, // Expected (Some)
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return_none as fn(&OutPoint) -> Option<TxOut>, // spent fn
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0, // Expected (None)
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),
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// 5 sigops (p2wpkh in + p2pkh out (x4))
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(
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"020000000001018c47330b1c4d30e7e2244e8ccb56d411b71e10073bb42fa1813f3f01\
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e144cc4d0100000000fdffffff01f7e30300000000001976a9143b49fd16f7562cfeedc\
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6a4ba84805f8c2f8e1a2c88ac024830450221009a4dbf077a63f6e4c3628a5fef2a09ec\
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6f7ca4a4d95bc8bb69195b6b671e9272022074da9ffff5a677fc7b37d66bb4ff1f316c9\
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dbacb92058291d84cd4b83f7c63c9012103d013e9e53c9ca8dd2ddffab1e9df27811503\
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feea7eb0700ff058851bbb37d99000000000",
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5,
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return_p2wpkh,
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4,
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),
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// 8 sigops (P2WSH 3-of-4 MS (4) in + P2WSH out + P2PKH out (1x4))
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(
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"01000000000101e70d7b4d957122909a665070b0c5bbb693982d09e4e66b9e6b7a8390\
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ce65ef1f0100000000ffffffff02095f2b0000000000220020800a016ea57a08f30c273\
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ae7624f8f91c505ccbd3043829349533f317168248c52594500000000001976a914607f\
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643372477c044c6d40b814288e40832a602688ac05004730440220282943649e687b5a3\
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bda9403c16f363c2ee2be0ec43fb8df40a08b96a4367d47022014e8f36938eef41a09ee\
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d77a815b0fa120a35f25e3a185310f050959420cee360147304402201e555f894036dd5\
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78045701e03bf10e093d7e93cd9997e44c1fc65a7b669852302206893f7261e52c9d779\
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5ba39d99aad30663da43ed675c389542805469fa8eb26a014730440220510fc99bc37d6\
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dbfa7e8724f4802cebdb17b012aaf70ce625e22e6158b139f40022022e9b811751d491f\
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bdec7691b697e88ba84315f6739b9e3bd4425ac40563aed2018b5321029ddecf0cc2013\
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514961550e981a0b8b60e7952f70561a5bb552aa7f075e71e3c2103316195a59c35a3b2\
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7b6dfcc3192cc10a7a6bbccd5658dfbe98ca62a13d6a02c121034629d906165742def4e\
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f53c6dade5dcbf88b775774cad151e35ae8285e613b0221035826a29938de2076950811\
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13c58bcf61fe6adacc3aacceb21c4827765781572d54ae00000000",
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8,
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return_p2wsh,
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4,
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),
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// 5 sigops (P2SH-P2WPKH in (1), 2 P2SH outs (0), 1 P2PKH out (1x4))
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(
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"010000000001018aec7e0729ba5a2d284303c89b3f397e92d54472a225d28eb0ae2fa6\
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5a7d1a2e02000000171600145ad5db65f313ab76726eb178c2fd8f21f977838dfdfffff\
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f03102700000000000017a914dca89e03ba124c2c70e55533f91100f2d9dab04587f2d7\
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1d00000000001976a91442a34f4b0a65bc81278b665d37fd15910d261ec588ac292c3b0\
|
||||||
|
00000000017a91461978dcebd0db2da0235c1ba3e8087f9fd74c57f8702473044022000\
|
||||||
|
9226f8def30a8ffa53e55ca5d71a72a64cd20ae7f3112562e3413bd0731d2c0220360d2\
|
||||||
|
20435e67eef7f2bf0258d1dded706e3824f06d961ba9eeaed300b16c2cc012103180cff\
|
||||||
|
753d3e4ee1aa72b2b0fd72ce75956d04f4c19400a3daed0b18c3ab831e00000000",
|
||||||
|
5,
|
||||||
|
return_p2sh,
|
||||||
|
4,
|
||||||
|
),
|
||||||
|
// 12 sigops (1 P2SH 2-of-3 MS in (3x4), P2SH outs (0))
|
||||||
|
(
|
||||||
|
"010000000115fe9ec3dc964e41f5267ea26cfe505f202bf3b292627496b04bece84da9\
|
||||||
|
b18903000000fc004730440220442827f1085364bda58c5884cee7b289934083362db6d\
|
||||||
|
fb627dc46f6cdbf5793022078cfa524252c381f2a572f0c41486e2838ca94aa268f2384\
|
||||||
|
d0e515744bf0e1e9014730440220160e49536bb29a49c7626744ee83150174c22fa40d5\
|
||||||
|
8fb4cd554a907a6a7b825022045f6cf148504b334064686795f0968c689e542f475b8ef\
|
||||||
|
5a5fa42383948226a3014c69522103e54bc61efbcb8eeff3a5ab2a92a75272f5f6820e3\
|
||||||
|
8e3d28edb54beb06b86c0862103a553e30733d7a8df6d390d59cc136e2c9d9cf4e808f3\
|
||||||
|
b6ab009beae68dd60822210291c5a54bb8b00b6f72b90af0ac0ecaf78fab026d8eded28\
|
||||||
|
2ad95d4d65db268c953aeffffffff024c4f0d000000000017a9146ebf0484bd5053f727\
|
||||||
|
c755a750aa4c815dfa112887a06b12020000000017a91410065dd50b3a7f299fef3b1c5\
|
||||||
|
3b8216399916ab08700000000",
|
||||||
|
12,
|
||||||
|
return_p2sh,
|
||||||
|
0,
|
||||||
|
),
|
||||||
|
// 3 sigops (1 P2SH-P2WSH 2-of-3 MS in (3), P2SH + P2WSH outs (0))
|
||||||
|
(
|
||||||
|
"0100000000010117a31277a8ba3957be351fe4cffd080e05e07f9ee1594d638f55dd7d\
|
||||||
|
707a983c01000000232200203a33fc9628c29f36a492d9fd811fd20231fbd563f7863e7\
|
||||||
|
9c4dc0ed34ea84b15ffffffff033bed03000000000017a914fb00d9a49663fd8ae84339\
|
||||||
|
8ae81299a1941fb8d287429404000000000017a9148fe08d81882a339cf913281eca8af\
|
||||||
|
39110507c798751ab1300000000002200208819e4bac0109b659de6b9168b83238a050b\
|
||||||
|
ef16278e470083b39d28d2aa5a6904004830450221009faf81f72ec9b14a39f0f0e12f0\
|
||||||
|
1a7175a4fe3239cd9a015ff2085985a9b0e3f022059e1aaf96c9282298bdc9968a46d8a\
|
||||||
|
d28e7299799835cf982b02c35e217caeae0147304402202b1875355ee751e0c8b21990b\
|
||||||
|
7ea73bd84dfd3bd17477b40fc96552acba306ad02204913bc43acf02821a3403132aa0c\
|
||||||
|
33ac1c018d64a119f6cb55dfb8f408d997ef01695221023c15bf3436c0b4089e0ed0428\
|
||||||
|
5101983199d0967bd6682d278821c1e2ac3583621034d924ccabac6d190ce8343829834\
|
||||||
|
cac737aa65a9abe521bcccdcc3882d97481f21035d01d092bb0ebcb793ba3ffa0aeb143\
|
||||||
|
2868f5277d5d3d2a7d2bc1359ec13abbd53aee1560c00",
|
||||||
|
3,
|
||||||
|
return_p2sh,
|
||||||
|
0,
|
||||||
|
),
|
||||||
|
// 80 sigops (1 P2PKH ins (0), 1 BARE MS outs (20x4))
|
||||||
|
(
|
||||||
|
"0100000001628c1726fecd23331ae9ff2872341b82d2c03180aa64f9bceefe457448db\
|
||||||
|
e579020000006a47304402204799581a5b34ae5adca21ef22c55dbfcee58527127c95d0\
|
||||||
|
1413820fe7556ed970220391565b24dc47ce57fe56bf029792f821a392cdb5a3d45ed85\
|
||||||
|
c158997e7421390121037b2fb5b602e51c493acf4bf2d2423bcf63a09b3b99dfb7bd3c8\
|
||||||
|
d74733b5d66f5ffffffff011c0300000000000069512103a29472a1848105b2225f0eca\
|
||||||
|
5c35ada0b0abbc3c538818a53eca177f4f4dcd9621020c8fd41b65ae6b980c072c5a9f3\
|
||||||
|
aec9f82162c92eb4c51d914348f4390ac39122102222222222222222222222222222222\
|
||||||
|
222222222222222222222222222222222253ae00000000",
|
||||||
|
80,
|
||||||
|
return_none,
|
||||||
|
80,
|
||||||
|
),
|
||||||
|
];
|
||||||
|
|
||||||
|
// All we need is to trigger 3 cases for prevout
|
||||||
|
fn return_p2sh(_outpoint: &OutPoint) -> Option<TxOut> {
|
||||||
|
Some(
|
||||||
|
deserialize(&hex!(
|
||||||
|
"cc721b000000000017a91428203c10cc8f18a77412caaa83dabaf62b8fbb0f87"
|
||||||
|
))
|
||||||
|
.unwrap(),
|
||||||
|
)
|
||||||
|
}
|
||||||
|
fn return_p2wpkh(_outpoint: &OutPoint) -> Option<TxOut> {
|
||||||
|
Some(
|
||||||
|
deserialize(&hex!(
|
||||||
|
"e695779d000000001600141c6977423aa4b82a0d7f8496cdf3fc2f8b4f580c"
|
||||||
|
))
|
||||||
|
.unwrap(),
|
||||||
|
)
|
||||||
|
}
|
||||||
|
fn return_p2wsh(_outpoint: &OutPoint) -> Option<TxOut> {
|
||||||
|
Some(
|
||||||
|
deserialize(&hex!(
|
||||||
|
"66b51e0900000000220020dbd6c9d5141617eff823176aa226eb69153c1e31334ac37469251a2539fc5c2b"
|
||||||
|
))
|
||||||
|
.unwrap(),
|
||||||
|
)
|
||||||
|
}
|
||||||
|
fn return_none(_outpoint: &OutPoint) -> Option<TxOut> { None }
|
||||||
|
|
||||||
|
for (hx, expected, spent_fn, expected_none) in tx_hexes.iter() {
|
||||||
|
let tx_bytes = hex!(hx);
|
||||||
|
let tx: Transaction = deserialize(&tx_bytes).unwrap();
|
||||||
|
assert_eq!(tx.total_sigop_cost(spent_fn), *expected);
|
||||||
|
assert_eq!(tx.total_sigop_cost(return_none), *expected_none);
|
||||||
|
}
|
||||||
|
}
|
||||||
}
|
}
|
||||||
|
|
||||||
#[cfg(bench)]
|
#[cfg(bench)]
|
||||||
|
|
|
||||||
Loading…
Reference in New Issue