fix: only republish if derp url changes

Author: Frando

Cargo.lock

@@ -22,6 +22,7 @@ hickory-proto = { version = "0.24.0", features = ["dnssec", "ring"] }
 hickory-resolver = { version = "0.24.0", features = ["dns-over-https", "dns-over-tls", "tokio-rustls", "webpki-roots", "dns-over-rustls", "dns-over-https-rustls"] }
 iroh-base = { version = "0.12.0", path = "../iroh-base", default_features = false, features = ["base32"] }
 iroh-net = { version = "0.12.0", path = "../iroh-net", default_features = false }
+parking_lot = "0.12.1"
 pkarr = { version = "1.1.1", features = ["async", "relay"], default_features = false }
 reqwest = { version = "0.11.24", features = ["rustls"] }
 ring = "0.16"

iroh-dns/Cargo.toml

@@ -1,6 +1,7 @@
 use anyhow::Result;
 use ed25519_dalek::SigningKey;
 use iroh_net::{key::SecretKey, AddrInfo, NodeId};
+use parking_lot::RwLock;
 use pkarr::PkarrClient;
 use url::Url;
 
@@ -41,6 +42,7 @@ pub struct Publisher {
     signing_key: SigningKey,
     pkarr_relay: Url,
     pkarr_client: PkarrClient,
+    last_announce: RwLock<Option<NodeAnnounce>>
 }
 
 impl Publisher {
@@ -53,6 +55,7 @@ impl Publisher {
             signing_key,
             pkarr_relay: config.pkarr_relay,
             pkarr_client,
+            last_announce: Default::default()
         }
     }
 
@@ -62,6 +65,10 @@ impl Publisher {
             info.derp_url.as_ref().map(|u| u.clone().into()),
             Default::default(),
         );
+        if self.last_announce.read().as_ref() == Some(&an) {
+            return Ok(());
+        }
+        let _ = self.last_announce.write().insert(an.clone());
         let signed_packet = an.into_pkarr_signed_packet(&self.signing_key)?;
         self.pkarr_client
             .relay_put(&self.pkarr_relay, &signed_packet)