perf: identity lookups — HTTP/2 and a handle answer cache #197

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opened 2026-10-05 02:19:52 +00:00 by Grandiras · 0 comments

Grandiras commented

2026-10-05 02:19:52 +00:00

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Problem

Identity lookups are slower than they need to be:

Every fetch goes out over HTTP/1.1, so a burst of concurrent lookups against one host (the PLC directory, the DNS-over-HTTPS endpoint) opens a connection per request. Measured on the live network, 88 concurrent PLC lookups take ~550 ms p50.
Handle answers are never remembered. IdentityResolver re-verifies the claimed handle on every resolution of a DID, even when the DID document is cached, so each call costs a well-known/DoH round trip (~120 ms p50 warm).

Proposal

Send identity fetches as HTTP/2 with fallback to 1.1 (RequestVersionOrLower). The same burst drops to ~335 ms p50.
Remember a handle's resolved DID for IdentityResolverOptions.HandleCacheTtl (default 5 min; zero disables), as the handle spec recommends. Only answers are cached, never "no answer" or conflicts. ResolveUncachedAsync bypasses the cache.

### Problem Identity lookups are slower than they need to be: - Every fetch goes out over HTTP/1.1, so a burst of concurrent lookups against one host (the PLC directory, the DNS-over-HTTPS endpoint) opens a connection per request. Measured on the live network, 88 concurrent PLC lookups take ~550 ms p50. - Handle answers are never remembered. `IdentityResolver` re-verifies the claimed handle on every resolution of a DID, even when the DID document is cached, so each call costs a well-known/DoH round trip (~120 ms p50 warm). ### Proposal - Send identity fetches as HTTP/2 with fallback to 1.1 (`RequestVersionOrLower`). The same burst drops to ~335 ms p50. - Remember a handle's resolved DID for `IdentityResolverOptions.HandleCacheTtl` (default 5 min; zero disables), as the handle spec recommends. Only answers are cached, never "no answer" or conflicts. `ResolveUncachedAsync` bypasses the cache.

Grandiras referenced this issue from a commit

2026-10-05 02:20:24 +00:00

perf: identity lookups over HTTP/2, with a handle answer cache (closes #197)

Grandiras referenced this issue from a pull request that will close it,

2026-10-05 02:20:37 +00:00

perf: identity lookups over HTTP/2, with a handle answer cache #198

Grandiras referenced this issue

2026-10-05 02:21:08 +00:00

perf: identity types and DID documents — allocations and debloat #200

Grandiras referenced this issue

2026-10-05 02:29:46 +00:00

perf: leaner XRPC request path (HTTP/2, single JSON serialization, DPoP) #201