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Add upper bound for bitcoin fees of 100,000 satoshi.

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Fees are hard to compute and it is too easy to get wrong and lose a lot of money. Hence, a hardcoded maximum of 100,000 satoshi for a single transaction is in place.
This commit is contained in:
Philipp Hoenisch 2021-05-03 11:48:21 +10:00
parent 46e0449b8e
commit 14c5a4f025
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GPG Key ID: E5F8E74C672BC666
1 changed files with 8 additions and 0 deletions
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8
swap/src/bitcoin/wallet.rs
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@ -22,6 +22,7 @@ use std::time::{Duration, Instant};
use tokio::sync::{watch, Mutex}; use tokio::sync::{watch, Mutex};
const SLED_TREE_NAME: &str = "default_tree"; const SLED_TREE_NAME: &str = "default_tree";
const MAX_TX_FEE: u64 = 100_000;
pub struct Wallet<B = ElectrumBlockchain, D = bdk::sled::Tree, C = Client> { pub struct Wallet<B = ElectrumBlockchain, D = bdk::sled::Tree, C = Client> {
client: Arc<Mutex<C>>, client: Arc<Mutex<C>>,
@ -344,6 +345,7 @@ where
fee_rate, fee_rate,
sats_per_vbyte sats_per_vbyte
); );
if sats_per_vbyte < min_relay_fee.as_sat() { if sats_per_vbyte < min_relay_fee.as_sat() {
tracing::warn!( tracing::warn!(
"Estimated fee of {} is smaller than the min relay fee, defaulting to min relay fee {}", "Estimated fee of {} is smaller than the min relay fee, defaulting to min relay fee {}",
@ -351,6 +353,12 @@ where
min_relay_fee.as_sat() min_relay_fee.as_sat()
); );
Ok(min_relay_fee) Ok(min_relay_fee)
} else if sats_per_vbyte > MAX_TX_FEE {
tracing::warn!(
"Hard bound of max transaction fees reached. Falling back to: {} sats",
MAX_TX_FEE
);
Ok(bitcoin::Amount::from_sat(MAX_TX_FEE))
} else { } else {
Ok(bitcoin::Amount::from_sat(sats_per_vbyte)) Ok(bitcoin::Amount::from_sat(sats_per_vbyte))
} }