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Implementation plan + Phase 1 finished

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This commit is contained in:
David Osipov
2026-04-02 20:08:47 +04:00
parent 5c29870632
commit a9f695623d
16 changed files with 4199 additions and 18 deletions
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56
src/proxy/adaptive_buffers.rs
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@@ -24,6 +24,8 @@ const DIRECT_S2C_CAP_BYTES: usize = 512 * 1024;
const ME_FRAMES_CAP: usize = 96;
const ME_BYTES_CAP: usize = 384 * 1024;
const ME_DELAY_MIN_US: u64 = 150;
const MAX_USER_PROFILES_ENTRIES: usize = 50_000;
const MAX_USER_KEY_BYTES: usize = 512;
#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord)]
pub enum AdaptiveTier {
@@ -234,32 +236,48 @@ fn profiles() -> &'static DashMap<String, UserAdaptiveProfile> {
}
pub fn seed_tier_for_user(user: &str) -> AdaptiveTier {
if user.len() > MAX_USER_KEY_BYTES {
return AdaptiveTier::Base;
}
let now = Instant::now();
if let Some(entry) = profiles().get(user) {
let value = entry.value();
if now.duration_since(value.seen_at) <= PROFILE_TTL {
let value = *entry.value();
drop(entry);
if now.saturating_duration_since(value.seen_at) <= PROFILE_TTL {
return value.tier;
}
profiles().remove_if(user, |_, v| now.saturating_duration_since(v.seen_at) > PROFILE_TTL);
}
AdaptiveTier::Base
}
pub fn record_user_tier(user: &str, tier: AdaptiveTier) {
let now = Instant::now();
if let Some(mut entry) = profiles().get_mut(user) {
let existing = *entry;
let effective = if now.duration_since(existing.seen_at) > PROFILE_TTL {
tier
} else {
max(existing.tier, tier)
};
*entry = UserAdaptiveProfile {
tier: effective,
seen_at: now,
};
if user.len() > MAX_USER_KEY_BYTES {
return;
}
profiles().insert(user.to_string(), UserAdaptiveProfile { tier, seen_at: now });
let now = Instant::now();
let mut was_vacant = false;
match profiles().entry(user.to_string()) {
dashmap::mapref::entry::Entry::Occupied(mut entry) => {
let existing = *entry.get();
let effective = if now.saturating_duration_since(existing.seen_at) > PROFILE_TTL {
tier
} else {
max(existing.tier, tier)
};
entry.insert(UserAdaptiveProfile {
tier: effective,
seen_at: now,
});
}
dashmap::mapref::entry::Entry::Vacant(slot) => {
slot.insert(UserAdaptiveProfile { tier, seen_at: now });
was_vacant = true;
}
}
if was_vacant && profiles().len() > MAX_USER_PROFILES_ENTRIES {
profiles().retain(|_, v| now.saturating_duration_since(v.seen_at) <= PROFILE_TTL);
}
}
pub fn direct_copy_buffers_for_tier(
@@ -310,6 +328,14 @@ fn scale(base: usize, numerator: usize, denominator: usize, cap: usize) -> usize
scaled.min(cap).max(1)
}
#[cfg(test)]
#[path = "tests/adaptive_buffers_security_tests.rs"]
mod adaptive_buffers_security_tests;
#[cfg(test)]
#[path = "tests/adaptive_buffers_record_race_security_tests.rs"]
mod adaptive_buffers_record_race_security_tests;
#[cfg(test)]
mod tests {
use super::*;