GUI now starts verif server in background

This is done by user clicking a dot which changes color.
The server's slow startup is monitored with a new RPC
call 'echo'.
The app is now basically fully functional, but rough edges
need cleaning off, in particular the syncing of the config
vars that are being set in the window, with those used
to start up the server.

Cargo.toml

@@ -13,6 +13,7 @@ version = "0.0.1"
 edition = "2021"
 
 [dependencies]
+futures = {version = "0.3.3", features = ["executor"]}
 rand = { version = "0.8", default-features = false }
 bulletproofs = { git = "https://github.com/AdamISZ/curve-trees", rev = "7268c22944595e2cfe52de623d33ece6f4882e5f" }
 relations = { git = "https://github.com/AdamISZ/curve-trees", rev = "7268c22944595e2cfe52de623d33ece6f4882e5f" }

src/autctactions.rs

@@ -114,6 +114,14 @@ fn print_and_return(s: &str) -> Result<String, Box<dyn Error>>{
     Ok(s.to_string())
 }
 
+pub async fn request_echo(autctcfg: &AutctConfig) -> Result<String, Box<dyn Error>> {
+    let res = rpcclient::echo(autctcfg).await;
+    match res {
+        Ok(x) => Ok(x.response_msg),
+        Err(_) => Err("Failed echo call".into())
+    }
+}
+
 pub async fn request_audit_verify(autctcfg: AutctConfig) -> Result<String, Box<dyn Error>>{
     let res = rpcclient::auditverify(autctcfg.clone()).await;
     match res {