feat(spells): support -relay- for spell scripts [NET-374] (#1461)

crates/particle-node-tests/tests/spells.rs

@@ -177,7 +177,7 @@ fn spell_args_test() {
     let mut config = TriggerConfig::default();
     config.clock.period_sec = 1;
     config.clock.start_sec = 1;
-    let expected_value = json! ({"a": "b", "c": 1});
+    let expected_value = json!({"a": "b", "c": 1});
     create_spell(
         &mut client,
         &script,
@@ -1007,6 +1007,7 @@ fn spell_peer_id_test() {
 
     assert_eq!(result, scope_peer_id);
 }
+
 #[test]
 fn spell_update_config() {
     let swarms = make_swarms(1);
@@ -1245,3 +1246,39 @@ fn resolve_global_alias() {
         assert_eq!(*resolved, tetraplets_service.id);
     }
 }
+
+#[test]
+fn spell_relay_id_test() {
+    let swarms = make_swarms(1);
+    let mut client = ConnectedClient::connect_to(swarms[0].multiaddr.clone())
+        .wrap_err("connect client")
+        .unwrap();
+
+    let script = format!(
+        r#"
+        (seq
+            (seq
+                (call %init_peer_id% ("getDataSrv" "-relay-") [] -relay-)
+                (call -relay- ("op" "identity") [-relay-] also_relay)
+            )
+            (call "{}" ("return" "") [also_relay])
+        )"#,
+        client.peer_id
+    );
+
+    let mut config = TriggerConfig::default();
+    config.clock.period_sec = 1;
+    config.clock.start_sec = 1;
+    create_spell(&mut client, &script, config, json!({}));
+
+    if let [JValue::String(relay_id)] = client
+        .receive_args()
+        .wrap_err("receive")
+        .unwrap()
+        .as_slice()
+    {
+        assert_eq!(*relay_id, client.node.to_base58());
+    } else {
+        panic!("expected one string result")
+    }
+}

sorcerer/src/sorcerer.rs

@@ -20,6 +20,7 @@ use std::time::Duration;
 use async_std::task::{spawn, JoinHandle};
 use fluence_spell_dtos::trigger_config::TriggerConfigValue;
 use futures::{FutureExt, StreamExt};
+use serde_json::Value;
 
 use aquamarine::AquamarineApi;
 use fluence_libp2p::types::Inlet;
@@ -167,6 +168,7 @@ impl Sorcerer {
 
         let mut get_data_srv = SpellBuiltin::new("getDataSrv");
         get_data_srv.append("spell_id", self.make_get_spell_id_closure().into());
+        get_data_srv.append("-relay-", self.make_get_relay_closure().into());
         get_data_srv.set_unhandled(self.make_get_spell_arg_closure().into());
         spell_builtins.push(get_data_srv);
 
@@ -254,6 +256,14 @@ impl Sorcerer {
         Box::new(move |_, params| async move { wrap(get_spell_id(params)) }.boxed())
     }
 
+    fn make_get_relay_closure(&self) -> ServiceFunctionImmut {
+        let relay_peer_id = self.key_manager.get_host_peer_id().to_base58();
+        Box::new(move |_, _| {
+            let relay = relay_peer_id.clone();
+            async move { wrap(Ok(Value::String(relay))) }.boxed()
+        })
+    }
+
     fn make_get_spell_arg_closure(&self) -> ServiceFunctionImmut {
         let services = self.services.clone();
         Box::new(move |args, params| {