Fetch user relays, synchronously

app/services/nostr_manager/discover_user_relays.rb

@@ -0,0 +1,33 @@
+module NostrManager
+  class DiscoverUserRelays < NostrManagerService
+    def initialize(pubkey:)
+      @pubkey = pubkey
+      @relays = Setting.nostr_discovery_relays
+      # @relays = %w[
+      #   wss://nostr.kosmos.org
+      #   wss://purplepag.es
+      #   wss://relay.nostr.band
+      #   wss://njump.me
+      # ]
+    end
+
+    def call
+      nip65_events = []
+      user_relays = []
+      filter = Nostr::Filter.new(
+        authors: [@pubkey],
+        kinds: [10002],
+        limit: 1,
+      )
+
+      @relays.each do |url|
+        event = NostrManager::FetchLatestEvent.call(filter: filter, relay_url: url)
+        if event.present? && user_relays.detect { |r| r[:id] == event["id"] }.nil?
+          user_relays << { id: event["id"], created_at: event["created_at"] }
+        end
+      end
+
+      puts user_relays.inspect
+    end
+  end
+end