92 lines
3.0 KiB
Rust
92 lines
3.0 KiB
Rust
//! Transaction types.
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#![allow(clippy::unit_arg)]
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#[cfg(test)]
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use proptest_derive::Arbitrary;
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use crate::types::{
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amount::{Amount, NonNegative},
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BlockHeight, Script,
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};
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use super::TransactionHash;
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/// Arbitrary data inserted by miners into a coinbase transaction.
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#[derive(Clone, Debug, 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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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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/// 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)]
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#[cfg_attr(test, 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: TransactionHash,
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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 TransparentInput {
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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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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: BlockHeight,
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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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/// 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)]
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#[cfg_attr(test, derive(Arbitrary))]
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pub struct TransparentOutput {
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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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/// Usually contains the public key as a Bitcoin script setting up
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/// conditions to claim this output.
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pub pk_script: Script,
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}
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