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feat: in-flight query coalescing for recursive resolver

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When multiple queries for the same (domain, qtype) arrive concurrently
and all miss the cache, only the first triggers recursive resolution.
Subsequent queries wait on a broadcast channel for the result.

Prevents thundering herd where N concurrent cache misses each
independently walk the full NS chain, compounding timeouts.

Uses InflightGuard (Drop impl) to guarantee map cleanup on
panic/cancellation — prevents permanent SERVFAIL poisoning.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
Razvan Dimescu
2026-03-29 08:54:04 +03:00
parent 87c321f3d4
commit 1028c1a48d
4 changed files with 86 additions and 21 deletions
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Cargo.toml
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@@ -10,7 +10,7 @@ keywords = ["dns", "dns-server", "ad-blocking", "reverse-proxy", "developer-tool
categories = ["network-programming", "development-tools"]
[dependencies]
tokio = { version = "1", features = ["rt-multi-thread", "macros", "net", "time"] }
tokio = { version = "1", features = ["rt-multi-thread", "macros", "net", "time", "sync"] }
axum = "0.8"
serde = { version = "1", features = ["derive"] }
serde_json = "1"