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use lru_cache::LruCache;
use crate::core::hash::{Hash, Hashed};
use crate::core::{Output, TxKernel};
pub trait VerifierCache: Sync + Send {
fn filter_kernel_sig_unverified(&mut self, kernels: &[TxKernel]) -> Vec<TxKernel>;
fn filter_rangeproof_unverified(&mut self, outputs: &[Output]) -> Vec<Output>;
fn add_kernel_sig_verified(&mut self, kernels: Vec<TxKernel>);
fn add_rangeproof_verified(&mut self, outputs: Vec<Output>);
}
pub struct LruVerifierCache {
kernel_sig_verification_cache: LruCache<Hash, ()>,
rangeproof_verification_cache: LruCache<Hash, ()>,
}
impl LruVerifierCache {
pub fn new() -> LruVerifierCache {
LruVerifierCache {
kernel_sig_verification_cache: LruCache::new(50_000),
rangeproof_verification_cache: LruCache::new(50_000),
}
}
}
impl VerifierCache for LruVerifierCache {
fn filter_kernel_sig_unverified(&mut self, kernels: &[TxKernel]) -> Vec<TxKernel> {
let res = kernels
.iter()
.filter(|x| !self.kernel_sig_verification_cache.contains_key(&x.hash()))
.cloned()
.collect::<Vec<_>>();
trace!(
"lru_verifier_cache: kernel sigs: {}, not cached (must verify): {}",
kernels.len(),
res.len()
);
res
}
fn filter_rangeproof_unverified(&mut self, outputs: &[Output]) -> Vec<Output> {
let res = outputs
.iter()
.filter(|x| {
!self
.rangeproof_verification_cache
.contains_key(&x.proof.hash())
})
.cloned()
.collect::<Vec<_>>();
trace!(
"lru_verifier_cache: rangeproofs: {}, not cached (must verify): {}",
outputs.len(),
res.len()
);
res
}
fn add_kernel_sig_verified(&mut self, kernels: Vec<TxKernel>) {
for k in kernels {
self.kernel_sig_verification_cache.insert(k.hash(), ());
}
}
fn add_rangeproof_verified(&mut self, outputs: Vec<Output>) {
for o in outputs {
self.rangeproof_verification_cache
.insert(o.proof.hash(), ());
}
}
}