Add duties service to validator

validator_client/src/config.rs

@@ -0,0 +1,25 @@
+use std::fs;
+use std::path::PathBuf;
+
+/// Stores the core configuration for this validator instance.
+#[derive(Clone)]
+pub struct ClientConfig {
+    pub data_dir: PathBuf,
+    pub server: String,
+}
+
+const DEFAULT_LIGHTHOUSE_DIR: &str = ".lighthouse-validators";
+
+impl ClientConfig {
+    /// Build a new lighthouse configuration from defaults.
+    pub fn default() -> Self {
+        let data_dir = {
+            let home = dirs::home_dir().expect("Unable to determine home dir.");
+            home.join(DEFAULT_LIGHTHOUSE_DIR)
+        };
+        fs::create_dir_all(&data_dir)
+            .unwrap_or_else(|_| panic!("Unable to create {:?}", &data_dir));
+        let server = "localhost:50051".to_string();
+        Self { data_dir, server }
+    }
+}