sdk: Fix two issues with the signer

`Signer.start()` was not creating the runtime, and spawning the
thread, rather it was assuming it already had a runtime. Since the
signer is isolated, we can just have it spawn its own thread and
runtime. The API will use a shared runtime it can block on, but the
signer needs to run independently in the background.

The second issue was that the `Signer.node_id()` method was still
stubbed out. Now it delegates to the gl-client Signer.

Reported-By: <@lvaccaro>

Author: cdecker

Cargo.lock

@@ -13,6 +13,7 @@ gl-client = { version = "0.3.1", path = "../gl-client" }
 once_cell = "1.21.3"
 thiserror = "2.0.17"
 tokio = { version = "1", features = ["sync"] }
+tracing = { version = "0.1.43", features = ["async-await", "log"] }
 uniffi = { version = "0.29.4" }
 
 [build-dependencies]

libs/gl-sdk/Cargo.toml

@@ -1,6 +1,7 @@
 use crate::{Credentials, Error};
 use bip39::Mnemonic;
 use std::str::FromStr;
+use tracing;
 
 #[derive(uniffi::Object, Clone)]
 pub struct Signer {
@@ -53,17 +54,24 @@ impl Signer {
 
     fn start(&self) -> Result<Handle, Error> {
         let (tx, rx) = tokio::sync::mpsc::channel(1);
-
-        let clone = self.clone();
-        tokio::spawn(async move {
-            clone.run(rx).await;
+        let inner = self.inner.clone();
+        std::thread::spawn(move || {
+            let runtime = tokio::runtime::Builder::new_current_thread()
+                .enable_all()
+                .build()
+                .expect("building tokio runtime");
+            runtime.block_on(async move {
+                if let Err(e) = inner.run_forever(rx).await {
+                    tracing::error!("Error running signer in thread: {e}")
+                }
+            })
         });
 
         Ok(Handle { chan: tx })
     }
 
     fn node_id(&self) -> Vec<u8> {
-        unimplemented!()
+        self.inner.node_id()
     }
 }
 

libs/gl-sdk/src/signer.rs

@@ -1,10 +1,16 @@
-"""Testing client-scheduler interactions
-"""
+"""Testing client-scheduler interactions"""
 
 import pytest
 import glsdk
 from gltesting.fixtures import *
 
+
 def test_register(scheduler, clients):
-    signer = glsdk.Signer("abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon about")
-    
+    signer = glsdk.Signer(" ".join(["abandon"] * 11 + ["about"]))
+    signer.start()
+
+    # Check that the derived node_id matches the Signer seed phrase.
+    assert (
+        signer.node_id().hex()
+        == "03653e90c1ce4660fd8505dd6d643356e93cfe202af109d382787639dd5890e87d"
+    )