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Make the output distribution cache only available under a feature

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Enables a mode with reduced memory usage *and* increased safety given current
unsafety of the cache.

Relevant to https://github.com/serai-dex/serai/issues/415.
This commit is contained in:
Luke Parker 2023-11-13 00:17:58 -05:00
parent 351436a258
commit 3f7bdaa64b
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2 changed files with 16 additions and 5 deletions
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3
coins/monero/Cargo.toml
View file

@ -91,7 +91,7 @@ std = [
"monero-generators/std",
"futures/std",
"futures?/std",
"hex/std",
"serde/std",
@ -100,6 +100,7 @@ std = [
"base58-monero/std",
]
cache-distribution = ["futures"]
http-rpc = ["digest_auth", "simple-request", "tokio"]
multisig = ["transcript", "frost", "dleq", "std"]
binaries = ["tokio/rt-multi-thread", "tokio/macros", "http-rpc"]

18
coins/monero/src/wallet/decoys.rs
View file

@ -1,8 +1,11 @@
use std_shims::{sync::OnceLock, vec::Vec, collections::HashSet};
use std_shims::{vec::Vec, collections::HashSet};
#[cfg(not(feature = "std"))]
#[cfg(feature = "cache-distribution")]
use std_shims::sync::OnceLock;
#[cfg(all(feature = "cache-distribution", not(feature = "std")))]
use std_shims::sync::Mutex;
#[cfg(feature = "std")]
#[cfg(all(feature = "cache-distribution", feature = "std"))]
use futures::lock::Mutex;
use zeroize::{Zeroize, ZeroizeOnDrop};
@ -27,9 +30,11 @@ const BLOCK_TIME: usize = 120;
const BLOCKS_PER_YEAR: usize = 365 * 24 * 60 * 60 / BLOCK_TIME;
const TIP_APPLICATION: f64 = (LOCK_WINDOW * BLOCK_TIME) as f64;
// TODO: Expose an API to reset this in case a reorg occurs/the RPC fails/returns garbage
// TODO: Resolve safety of this in case a reorg occurs/the network changes
// TODO: Update this when scanning a block, as possible
#[cfg(feature = "cache-distribution")]
static DISTRIBUTION_CELL: OnceLock<Mutex<Vec<u64>>> = OnceLock::new();
#[cfg(feature = "cache-distribution")]
#[allow(non_snake_case)]
fn DISTRIBUTION() -> &'static Mutex<Vec<u64>> {
DISTRIBUTION_CELL.get_or_init(|| Mutex::new(Vec::with_capacity(3000000)))
@ -159,11 +164,16 @@ impl Decoys {
height: usize,
inputs: &[SpendableOutput],
) -> Result<Vec<Decoys>, RpcError> {
#[cfg(feature = "cache-distribution")]
#[cfg(not(feature = "std"))]
let mut distribution = DISTRIBUTION().lock();
#[cfg(feature = "cache-distribution")]
#[cfg(feature = "std")]
let mut distribution = DISTRIBUTION().lock().await;
#[cfg(not(feature = "cache-distribution"))]
let mut distribution = vec![];
let decoy_count = ring_len - 1;
// Convert the inputs in question to the raw output data