Saving mixnode's config on init

mixnode/src/commands/init.rs

@@ -1,5 +1,29 @@
-use clap::{App, Arg};
+use clap::{App, Arg, ArgMatches};
+use config::NymConfig;
 
 pub fn command_args<'a, 'b>() -> clap::App<'a, 'b> {
-    App::new("init").about("Initialise the mixnode")
+    App::new("init").about("Initialise the mixnode").arg(
+        Arg::with_name("id")
+            .long("id")
+            .help("Id of the nym-mixnode we want to create config for.")
+            .takes_value(true)
+            .required(true),
+    )
+}
+
+pub fn execute(matches: &ArgMatches) {
+    println!("Initialising mixnode...");
+
+    let id = matches.value_of("id").unwrap(); // required for now
+    let mut config = crate::config::Config::new(id);
+
+    // overriding config defaults here
+
+    let config_save_location = config.get_config_file_save_location();
+    config
+        .save_to_file(None)
+        .expect("Failed to save the config file");
+    println!("Saved configuration file to {:?}", config_save_location);
+
+    println!("Mixnode configuration completed.\n\n\n")
 }

mixnode/src/config/mod.rs

@@ -75,6 +75,23 @@ impl Config {
         self.mixnode.id = id;
         self
     }
+
+    // getters
+    pub fn get_config_file_save_location(&self) -> PathBuf {
+        self.config_directory().join(Self::config_file_name())
+    }
+
+    pub fn get_private_identity_key_file(&self) -> PathBuf {
+        self.mixnode.private_identity_key_file.clone()
+    }
+
+    pub fn get_public_identity_key_file(&self) -> PathBuf {
+        self.mixnode.public_identity_key_file.clone()
+    }
+
+    pub fn get_directory_server(&self) -> String {
+        self.mixnode.directory_server.clone()
+    }
 }
 
 #[derive(Debug, Deserialize, PartialEq, Serialize)]

mixnode/src/main.rs

@@ -27,6 +27,7 @@ fn main() {
 
 fn execute(matches: ArgMatches) {
     match matches.subcommand() {
+        ("init", Some(m)) => commands::init::execute(m),
         ("run", Some(m)) => node::runner::start(m),
         _ => println!("{}", usage()),
     }