chore: better error handling

bin/testapp/examples/print_token_address.rs

@@ -0,0 +1,52 @@
+use std::path::PathBuf;
+use std::sync::mpsc;
+
+use clap::Parser;
+use commonware_runtime::tokio::{Config as TokioConfig, Runner};
+use commonware_runtime::Runner as RunnerTrait;
+use evolve_node::HasTokenAccountId;
+use evolve_server::load_chain_state;
+use evolve_storage::{QmdbStorage, StorageConfig};
+use evolve_testapp::GenesisAccounts;
+use evolve_tx_eth::derive_runtime_contract_address;
+
+#[derive(Debug, Parser)]
+#[command(name = "print_token_address")]
+#[command(about = "Print the testapp token contract address for an initialized data dir")]
+struct Cli {
+    /// Path to the initialized node data directory
+    #[arg(long)]
+    data_dir: PathBuf,
+}
+
+fn main() {
+    let cli = Cli::parse();
+    let data_dir = cli.data_dir;
+    let (tx, rx) = mpsc::channel();
+
+    let runtime_config = TokioConfig::default()
+        .with_storage_directory(&data_dir)
+        .with_worker_threads(2);
+
+    Runner::new(runtime_config).start(move |context| async move {
+        let storage = QmdbStorage::new(
+            context,
+            StorageConfig {
+                path: data_dir,
+                ..Default::default()
+            },
+        )
+        .await
+        .expect("open qmdb storage");
+
+        let state =
+            load_chain_state::<GenesisAccounts, _>(&storage).expect("load initialized chain state");
+        let token_address =
+            derive_runtime_contract_address(state.genesis_result.token_account_id());
+
+        tx.send(token_address).expect("send token address");
+    });
+
+    let token_address = rx.recv().expect("receive token address");
+    println!("{token_address:#x}");
+}