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checker: add DiscoveryPublisher interface for cross-checker discovery

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Introduce a DiscoveryEntry struct and an optional DiscoveryPublisher
interface that providers can co-implement to declare things worth
probing by other checkers (TLS endpoints, HTTP probes, ACME challenges,
DNSSEC keys, ...) without having to re-parse raw observations.

DiscoveryEntry carries an opaque Payload: the SDK does not interpret
it. Producers and consumers agree on the Payload schema through a
separate contract (eg. a small shared Go package imported by
both) identified by the free-form Type string. This keeps the SDK
free of protocol-specific concepts; new entry families can appear
without touching it.

The /collect HTTP handler type-asserts the provider against
DiscoveryPublisher immediately after Collect and forwards the
resulting entries in ExternalCollectResponse.Entries.
This commit is contained in:
nemunaire 2026-04-19 10:27:17 +07:00
commit 087032f6cc
2 changed files with 67 additions and 5 deletions
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18
checker/server.go
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@ -256,9 +256,21 @@ func (s *Server) handleCollect(w http.ResponseWriter, r *http.Request) {
return
}
writeJSON(w, http.StatusOK, ExternalCollectResponse{
Data: json.RawMessage(raw),
})
resp := ExternalCollectResponse{Data: json.RawMessage(raw)}
// Harvest discovery entries from the native Go value, before it goes
// out of scope. No re-parse; DiscoverEntries operates on the same
// object that was just marshaled above.
if dp, ok := s.provider.(DiscoveryPublisher); ok {
entries, derr := dp.DiscoverEntries(data)
if derr != nil {
log.Printf("DiscoverEntries failed: %v", derr)
} else {
resp.Entries = entries
}
}
writeJSON(w, http.StatusOK, resp)
}
func (s *Server) handleEvaluate(w http.ResponseWriter, r *http.Request) {