Add a UntranslatedPeer constructor

This commits adds a constructor for UntranslatedPeer,
hidden under nodejs_rs_unstable feature flag. This constructor
is needed to allow unit testing of the address translation policies,
implemented in that driver.

Author: adespawn

scylla/Cargo.toml

@@ -157,6 +157,7 @@ unexpected_cfgs = { level = "warn", check-cfg = [
     'cfg(scylla_cloud_tests)',
     'cfg(cassandra_tests)',
     'cfg(cpp_rust_unstable)',
+    'cfg(nodejs_rs_unstable)',
     'cfg(ccm_tests)',
 ] }
 

scylla/src/policies/address_translator.rs

@@ -49,6 +49,18 @@ impl UntranslatedPeer<'_> {
     pub fn rack(&self) -> Option<&str> {
         self.rack
     }
+
+    /// Creates a new untranslated peer. Intended to be used only in nodejs-rs driver only.
+    /// This specific constructor is intended for unit tests only.
+    #[cfg(nodejs_rs_unstable)]
+    pub fn new(address: SocketAddr) -> Self {
+        UntranslatedPeer {
+            host_id: Uuid::nil(),
+            untranslated_address: address,
+            datacenter: None,
+            rack: None,
+        }
+    }
 }
 
 /// Translates IP addresses received from ScyllaDB nodes into locally reachable addresses.