Merge pull request #584 from darosior/max_tx_weight_const

Introduce some policy constants from Bitcoin Core
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Sebastian 2021-05-29 02:49:46 +02:00 committed by GitHub
commit d7eb15c6f1
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4 changed files with 66 additions and 2 deletions

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@ -46,7 +46,8 @@ pub const MAX_BLOCK_WEIGHT: u32 = 4_000_000;
pub const MIN_TRANSACTION_WEIGHT: u32 = 4 * 60;
/// The factor that non-witness serialization data is multiplied by during weight calculation
pub const WITNESS_SCALE_FACTOR: usize = 4;
/// The maximum allowed number of signature check operations in a block
pub const MAX_BLOCK_SIGOPS_COST: i64 = 80_000;
/// In Bitcoind this is insanely described as ~((u256)0 >> 32)
pub fn max_target(_: Network) -> Uint256 {

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@ -33,6 +33,7 @@ use hash_types::{PubkeyHash, WPubkeyHash, ScriptHash, WScriptHash};
use blockdata::opcodes;
use consensus::{encode, Decodable, Encodable};
use hashes::{Hash, hex};
use policy::DUST_RELAY_TX_FEE;
#[cfg(feature="bitcoinconsensus")] use bitcoinconsensus;
#[cfg(feature="bitcoinconsensus")] use std::convert;
#[cfg(feature="bitcoinconsensus")] use OutPoint;
@ -412,7 +413,7 @@ impl Script {
// This must never be lower than Bitcoin Core's GetDustThreshold() (as of v0.21) as it may
// otherwise allow users to create transactions which likely can never be
// broadcasted/confirmed.
3 * // The default dust relay fee is 3000 satoshi/kB (ie 3 sat/vByte)
DUST_RELAY_TX_FEE as u64 / 1000 * // The default dust relay fee is 3000 satoshi/kB (ie 3 sat/vByte)
if self.is_op_return() {
0
} else if self.is_witness_program() {

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@ -68,6 +68,7 @@ pub mod blockdata;
pub mod util;
pub mod consensus;
pub mod hash_types;
pub mod policy;
pub use hash_types::*;
pub use blockdata::block::Block;

61
src/policy/mod.rs Normal file
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@ -0,0 +1,61 @@
// Rust Bitcoin Library
// Written in 2014 by
// Andrew Poelstra <apoelstra@wpsoftware.net>
//
// To the extent possible under law, the author(s) have dedicated all
// copyright and related and neighboring rights to this software to
// the public domain worldwide. This software is distributed without
// any warranty.
//
// You should have received a copy of the CC0 Public Domain Dedication
// along with this software.
// If not, see <http://creativecommons.org/publicdomain/zero/1.0/>.
//
//! Policy
//!
//! This module exposes some constants and functions used in the reference implementation and which
//! as a consequence defines some network rules.
//!
//! # *Warning*
//! While the constants present in this module are very unlikely to change, they do not define
//! Bitcoin. As such they must not be relied upon as if they were consensus rules.
//!
//! These values were taken from bitcoind v0.21.1 (194b9b8792d9b0798fdb570b79fa51f1d1f5ebaf).
use super::blockdata::constants::{MAX_BLOCK_SIGOPS_COST, WITNESS_SCALE_FACTOR};
use std::cmp;
/// Maximum weight of a transaction for it to be relayed by most nodes on the network
pub const MAX_STANDARD_TX_WEIGHT: u32 = 400_000;
/// Minimum non-witness size for a standard transaction (1 segwit input + 1 P2WPKH output = 82 bytes)
pub const MIN_STANDARD_TX_NONWITNESS_SIZE: u32 = 82;
/// Maximum number of sigops in a standard tx.
pub const MAX_STANDARD_TX_SIGOPS_COST: u32 = MAX_BLOCK_SIGOPS_COST as u32 / 5;
/// The minimum incremental *feerate* (despite the name), in sats per virtual kilobyte for RBF.
pub const DEFAULT_INCREMENTAL_RELAY_FEE: u32 = 1_000;
/// The number of bytes equivalent per signature operation. Affects transaction relay through the
/// virtual size computation.
pub const DEFAULT_BYTES_PER_SIGOP: u32 = 20;
/// The minimum feerate, in sats per kilo-virtualbyte, for defining dust. An output is considered
/// dust if spending it under this feerate would cost more in fee.
pub const DUST_RELAY_TX_FEE: u32 = 3_000;
/// Minimum feerate, in sats per virtual kilobyte, for a transaction to be relayed by most nodes on
/// the network.
pub const DEFAULT_MIN_RELAY_TX_FEE: u32 = 1_000;
/// Default number of hours for an unconfirmed transaction to expire in most of the network nodes'
/// mempools.
pub const DEFAULT_MEMPOOL_EXPIRY: u32 = 336;
/// The virtual transaction size, as computed by default by bitcoind node.
pub fn get_virtual_tx_size(weight: i64, n_sigops: i64) -> i64 {
(cmp::max(weight, n_sigops * DEFAULT_BYTES_PER_SIGOP as i64) + WITNESS_SCALE_FACTOR as i64 - 1)
/ WITNESS_SCALE_FACTOR as i64
}