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// This file is Copyright its original authors, visible in version control
// history.
//
// This file is licensed under the Apache License, Version 2.0 <LICENSE-APACHE
// or http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your option.
// You may not use this file except in accordance with one or both of these
// licenses.
//! Traits and utility impls which allow other parts of rust-lightning to interact with the
//! blockchain.
//!
//! Includes traits for monitoring and receiving notifications of new blocks and block
//! disconnections, transaction broadcasting, and feerate information requests.
use bitcoin::blockdata::transaction::Transaction;
/// An interface to send a transaction to the Bitcoin network.
pub trait BroadcasterInterface {
/// Sends a transaction out to (hopefully) be mined.
fn broadcast_transaction(&self, tx: &Transaction);
}
/// An enum that represents the speed at which we want a transaction to confirm used for feerate
/// estimation.
#[derive(Clone, Copy, PartialEq, Eq)]
pub enum ConfirmationTarget {
/// We are happy with this transaction confirming slowly when feerate drops some.
Background,
/// We'd like this transaction to confirm without major delay, but 12-18 blocks is fine.
Normal,
/// We'd like this transaction to confirm in the next few blocks.
HighPriority,
}
/// A trait which should be implemented to provide feerate information on a number of time
/// horizons.
///
/// Note that all of the functions implemented here *must* be reentrant-safe (obviously - they're
/// called from inside the library in response to chain events, P2P events, or timer events).
pub trait FeeEstimator {
/// Gets estimated satoshis of fee required per 1000 Weight-Units.
///
/// Must be no smaller than 253 (ie 1 satoshi-per-byte rounded up to ensure later round-downs
/// don't put us below 1 satoshi-per-byte).
///
/// This translates to:
/// * satoshis-per-byte * 250
/// * ceil(satoshis-per-kbyte / 4)
fn get_est_sat_per_1000_weight(&self, confirmation_target: ConfirmationTarget) -> u32;
}
/// Minimum relay fee as required by bitcoin network mempool policy.
pub const MIN_RELAY_FEE_SAT_PER_1000_WEIGHT: u64 = 4000;