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/*
This file is part of TALER
Copyright (C) 2022 Taler Systems SA
TALER is free software; you can redistribute it and/or modify it under the
terms of the GNU Affero General Public License as published by the Free Software
Foundation; either version 3, or (at your option) any later version.
TALER is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
A PARTICULAR PURPOSE. See the GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License along with
TALER; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
*/
use std::sync::atomic::Ordering;
use btc_wire::rpc::{AutoRpcCommon, ChainTipsStatus};
use common::{
log::log::{error, warn},
postgres::fallible_iterator::FallibleIterator,
reconnect::AutoReconnectDb,
};
use crate::WireState;
use super::LoopResult;
/// Analyse blockchain behavior and adapt confirmations in real time
pub fn analysis(mut rpc: AutoRpcCommon, mut db: AutoReconnectDb, state: &WireState) {
// The biggest fork ever seen
let mut max_seen = 0;
loop {
let rpc = rpc.client();
let db = db.client();
let result: LoopResult<()> = (|| {
// Register as listener
db.batch_execute("LISTEN new_block")?;
loop {
// Get biggest known valid fork
let fork = rpc
.get_chain_tips()?
.into_iter()
.filter_map(|t| {
(t.status == ChainTipsStatus::ValidFork).then(|| t.length)
})
.max()
.unwrap_or(0) as u16;
// The first time we see a fork that big
if fork > max_seen {
max_seen = fork;
let current_conf = state.confirmation.load(Ordering::SeqCst);
// If new fork is bigger than the current confirmation
if fork > current_conf {
// Max two time the configuration
let new_conf = fork.min(state.max_confirmation);
state.confirmation.store(new_conf, Ordering::SeqCst);
warn!(
"analysis: found dangerous fork of {} blocks, adapt confirmation to {} blocks capped at {}, you should update taler.conf",
fork, new_conf, state.max_confirmation
);
}
}
// TODO smarter analysis: suspicious transaction value, limit wire bitcoin throughput
// Wait for next notification
db.notifications().blocking_iter().next()?;
}
})();
if let Err(e) = result {
error!("analysis: {}", e);
}
}
}
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