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Vitor PamplonaandClaude Opus 5
5c24b003e7
A monitor normally probes — opens connections purely to measure, then
throws them away. A client that is already subscribing, fetching and
publishing has better data for free: measured under real load, against
the relays it actually uses, at the concurrency it actually runs.
RelayObserver is a RelayConnectionListener, so it sees every connection
whichever code path opened it and none of them has to report anything:
rtt-open onConnecting to onConnected
rtt-read first REQ to its EOSE
rtt-write first EVENT to its OK
reachable it opened, or served something
auth-required it sent AUTH, or CLOSED saying so
the error, verbatim, when it never opened
Everything is OBSERVED. Nothing is copied from a relay's NIP-11: that is
the relay's own claim, available to anyone who asks, and republishing it
under a monitor's signature adds nothing but a chance to go stale. Where
the two disagree — a relay advertising open reads that then challenges
us — the observation is the half worth having, and copying the claim
would erase it. It also keeps quartz free of an HTTP dependency.
RelayMonitor is the whole wiring: construct one and connections are
measured, signed as 30166s on an interval, and folded into a cheap
in-memory isKnownDead for picking relays. That read has to be cheap — an
outbox picker runs per event — so it answers from a snapshot refreshed on
an interval, never a store query.
The signer is required. Measuring relay quality and letting others check
it IS NIP-66, and an optional signer would just add the failure mode this
library keeps designing out: configured, silent, doing nothing. A client
that should not publish does not construct one.
RelayObserver also replaces the CLI's RelayDiagnostics, which was the
same listener minus the timings. Porting it surfaced a bug both shared:
substringBefore(':') returns the WHOLE string when there is no colon, so
a relay's free-form CLOSED prose became its own tally key and the map
grew with the number of distinct sentences relays wrote. The colon is
now required.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>