307 lines
9.8 KiB
Rust
307 lines
9.8 KiB
Rust
//! Transparent-related (Bitcoin-inherited) functionality.
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#![allow(clippy::unit_arg)]
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mod address;
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mod keys;
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mod script;
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mod serialize;
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mod utxo;
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pub use address::Address;
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pub use script::Script;
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pub use serialize::GENESIS_COINBASE_DATA;
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pub use utxo::{
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new_ordered_outputs, new_outputs, utxos_from_ordered_utxos, CoinbaseSpendRestriction,
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OrderedUtxo, Utxo,
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};
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pub(crate) use utxo::outputs_from_utxos;
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#[cfg(any(test, feature = "proptest-impl"))]
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pub(crate) use utxo::new_transaction_ordered_outputs;
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#[cfg(any(test, feature = "proptest-impl"))]
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use proptest_derive::Arbitrary;
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#[cfg(any(test, feature = "proptest-impl"))]
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mod arbitrary;
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#[cfg(test)]
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mod tests;
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use crate::{
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amount::{Amount, NonNegative},
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block, transaction,
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};
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use std::{collections::HashMap, fmt, iter};
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/// The maturity threshold for transparent coinbase outputs.
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///
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/// "A transaction MUST NOT spend a transparent output of a coinbase transaction
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/// from a block less than 100 blocks prior to the spend. Note that transparent
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/// outputs of coinbase transactions include Founders' Reward outputs and
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/// transparent Funding Stream outputs."
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/// [7.1](https://zips.z.cash/protocol/nu5.pdf#txnencodingandconsensus)
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pub const MIN_TRANSPARENT_COINBASE_MATURITY: u32 = 100;
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/// Arbitrary data inserted by miners into a coinbase transaction.
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#[derive(Clone, Eq, PartialEq, Serialize, Deserialize)]
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pub struct CoinbaseData(
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/// Invariant: this vec, together with the coinbase height, must be less than
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/// 100 bytes. We enforce this by only constructing CoinbaseData fields by
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/// parsing blocks with 100-byte data fields. When we implement block
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/// creation, we should provide a constructor for the coinbase data field
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/// that restricts it to 95 = 100 -1 -4 bytes (safe for any block height up
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/// to 500_000_000).
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pub(super) Vec<u8>,
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);
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#[cfg(any(test, feature = "proptest-impl"))]
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impl CoinbaseData {
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/// Create a new `CoinbaseData` containing `data`.
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///
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/// Only for use in tests.
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pub fn new(data: Vec<u8>) -> CoinbaseData {
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CoinbaseData(data)
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}
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}
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impl AsRef<[u8]> for CoinbaseData {
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fn as_ref(&self) -> &[u8] {
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self.0.as_ref()
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}
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}
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impl std::fmt::Debug for CoinbaseData {
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fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
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let escaped = String::from_utf8(
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self.0
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.iter()
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.cloned()
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.flat_map(std::ascii::escape_default)
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.collect(),
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)
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.expect("ascii::escape_default produces utf8");
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f.debug_tuple("CoinbaseData").field(&escaped).finish()
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}
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}
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/// OutPoint
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///
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/// A particular transaction output reference.
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#[derive(Copy, Clone, Debug, Eq, PartialEq, Serialize, Deserialize, Hash)]
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#[cfg_attr(any(test, feature = "proptest-impl"), derive(Arbitrary))]
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pub struct OutPoint {
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/// References the transaction that contains the UTXO being spent.
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pub hash: transaction::Hash,
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/// Identifies which UTXO from that transaction is referenced; the
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/// first output is 0, etc.
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pub index: u32,
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}
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/// A transparent input to a transaction.
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#[derive(Clone, Debug, Eq, PartialEq, Serialize, Deserialize)]
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pub enum Input {
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/// A reference to an output of a previous transaction.
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PrevOut {
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/// The previous output transaction reference.
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outpoint: OutPoint,
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/// The script that authorizes spending `outpoint`.
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unlock_script: Script,
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/// The sequence number for the output.
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sequence: u32,
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},
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/// New coins created by the block reward.
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Coinbase {
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/// The height of this block.
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height: block::Height,
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/// Free data inserted by miners after the block height.
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data: CoinbaseData,
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/// The sequence number for the output.
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sequence: u32,
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},
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}
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impl fmt::Display for Input {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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match self {
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Input::PrevOut {
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outpoint,
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unlock_script,
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..
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} => {
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let mut fmter = f.debug_struct("transparent::Input::PrevOut");
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fmter.field("unlock_script_len", &unlock_script.as_raw_bytes().len());
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fmter.field("outpoint", outpoint);
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fmter.finish()
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}
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Input::Coinbase { height, data, .. } => {
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let mut fmter = f.debug_struct("transparent::Input::Coinbase");
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fmter.field("height", height);
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fmter.field("data_len", &data.0.len());
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fmter.finish()
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}
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}
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}
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}
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impl Input {
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/// Returns the input's sequence number.
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pub fn sequence(&self) -> u32 {
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match self {
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Input::PrevOut { sequence, .. } | Input::Coinbase { sequence, .. } => *sequence,
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}
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}
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/// Sets the input's sequence number.
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///
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/// Only for use in tests.
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#[cfg(any(test, feature = "proptest-impl"))]
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pub fn set_sequence(&mut self, new_sequence: u32) {
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match self {
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Input::PrevOut { sequence, .. } | Input::Coinbase { sequence, .. } => {
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*sequence = new_sequence
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}
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}
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}
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/// If this is a `PrevOut` input, returns this input's outpoint.
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/// Otherwise, returns `None`.
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pub fn outpoint(&self) -> Option<OutPoint> {
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if let Input::PrevOut { outpoint, .. } = self {
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Some(*outpoint)
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} else {
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None
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}
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}
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/// Set this input's outpoint.
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///
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/// Should only be called on `PrevOut` inputs.
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///
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/// # Panics
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///
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/// If `self` is a coinbase input.
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#[cfg(any(test, feature = "proptest-impl"))]
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pub fn set_outpoint(&mut self, new_outpoint: OutPoint) {
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if let Input::PrevOut {
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ref mut outpoint, ..
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} = self
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{
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*outpoint = new_outpoint;
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} else {
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unreachable!("unexpected variant: Coinbase Inputs do not have OutPoints");
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}
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}
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/// Get the value spent by this input, by looking up its [`Outpoint`] in `outputs`.
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/// See `value` for details.
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///
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/// # Panics
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///
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/// If the provided `Output`s don't have this input's `Outpoint`.
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pub(crate) fn value_from_outputs(
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&self,
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outputs: &HashMap<OutPoint, Output>,
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) -> Amount<NonNegative> {
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match self {
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Input::PrevOut { outpoint, .. } => {
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outputs
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.get(outpoint)
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.unwrap_or_else(|| {
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panic!(
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"provided Outputs (length {:?}) don't have spent {:?}",
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outputs.len(),
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outpoint
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)
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})
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.value
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}
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Input::Coinbase { .. } => Amount::zero(),
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}
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}
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/// Get the value spent by this input, by looking up its [`Outpoint`] in `utxos`.
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///
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/// This amount is added to the transaction value pool by this input.
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///
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/// # Panics
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///
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/// If the provided `Utxo`s don't have this input's `Outpoint`.
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pub fn value(&self, utxos: &HashMap<OutPoint, utxo::Utxo>) -> Amount<NonNegative> {
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if let Some(outpoint) = self.outpoint() {
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// look up the specific Output and convert it to the expected format
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let output = utxos
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.get(&outpoint)
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.expect("provided Utxos don't have spent OutPoint")
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.output
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.clone();
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self.value_from_outputs(&iter::once((outpoint, output)).collect())
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} else {
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// coinbase inputs don't need any UTXOs
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self.value_from_outputs(&HashMap::new())
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}
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}
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/// Get the value spent by this input, by looking up its [`Outpoint`] in `ordered_utxos`.
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/// See `value` for details.
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///
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/// # Panics
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///
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/// If the provided `OrderedUtxo`s don't have this input's `Outpoint`.
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pub fn value_from_ordered_utxos(
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&self,
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ordered_utxos: &HashMap<OutPoint, utxo::OrderedUtxo>,
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) -> Amount<NonNegative> {
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if let Some(outpoint) = self.outpoint() {
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// look up the specific Output and convert it to the expected format
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let output = ordered_utxos
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.get(&outpoint)
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.expect("provided Utxos don't have spent OutPoint")
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.utxo
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.output
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.clone();
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self.value_from_outputs(&iter::once((outpoint, output)).collect())
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} else {
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// coinbase inputs don't need any UTXOs
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self.value_from_outputs(&HashMap::new())
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}
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}
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}
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/// A transparent output from a transaction.
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///
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/// The most fundamental building block of a transaction is a
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/// transaction output -- the ZEC you own in your "wallet" is in
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/// fact a subset of unspent transaction outputs (or "UTXO"s) of the
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/// global UTXO set.
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///
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/// UTXOs are indivisible, discrete units of value which can only be
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/// consumed in their entirety. Thus, if I want to send you 1 ZEC and
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/// I only own one UTXO worth 2 ZEC, I would construct a transaction
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/// that spends my UTXO and sends 1 ZEC to you and 1 ZEC back to me
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/// (just like receiving change).
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#[derive(Clone, Debug, Eq, PartialEq, Serialize, Deserialize, Hash)]
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#[cfg_attr(any(test, feature = "proptest-impl"), derive(Arbitrary))]
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pub struct Output {
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/// Transaction value.
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// At https://en.bitcoin.it/wiki/Protocol_documentation#tx, this is an i64.
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pub value: Amount<NonNegative>,
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/// The lock script defines the conditions under which this output can be spent.
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pub lock_script: Script,
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}
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impl Output {
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/// Get the value contained in this output.
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/// This amount is subtracted from the transaction value pool by this output.
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pub fn value(&self) -> Amount<NonNegative> {
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self.value
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}
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}
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