Feature/double init prevention (#386)

* Updated NymConfig trait making id always obligatory. Also added extra default method implementations

* Preventing init on mixnodes that were initialised before

* Quotes before mix id

* Preventing init on gateways that were initialised before

* Preventing init on native clients that were initialised before

* Preventing init on socks5 clients that were initialised before

clients/client-core/src/config/mod.rs

@@ -360,31 +360,31 @@ impl<T: NymConfig> Default for Client<T> {
 
 impl<T: NymConfig> Client<T> {
     fn default_private_identity_key_file(id: &str) -> PathBuf {
-        T::default_data_directory(Some(id)).join("private_identity.pem")
+        T::default_data_directory(id).join("private_identity.pem")
     }
 
     fn default_public_identity_key_file(id: &str) -> PathBuf {
-        T::default_data_directory(Some(id)).join("public_identity.pem")
+        T::default_data_directory(id).join("public_identity.pem")
     }
 
     fn default_private_encryption_key_file(id: &str) -> PathBuf {
-        T::default_data_directory(Some(id)).join("private_encryption.pem")
+        T::default_data_directory(id).join("private_encryption.pem")
     }
 
     fn default_public_encryption_key_file(id: &str) -> PathBuf {
-        T::default_data_directory(Some(id)).join("public_encryption.pem")
+        T::default_data_directory(id).join("public_encryption.pem")
     }
 
     fn default_gateway_shared_key_file(id: &str) -> PathBuf {
-        T::default_data_directory(Some(id)).join("gateway_shared.pem")
+        T::default_data_directory(id).join("gateway_shared.pem")
     }
 
     fn default_ack_key_file(id: &str) -> PathBuf {
-        T::default_data_directory(Some(id)).join("ack_key.pem")
+        T::default_data_directory(id).join("ack_key.pem")
     }
 
     fn default_reply_encryption_key_store_path(id: &str) -> PathBuf {
-        T::default_data_directory(Some(id)).join("reply_key_store")
+        T::default_data_directory(id).join("reply_key_store")
     }
 }
 

clients/native/src/client/config/mod.rs

@@ -55,10 +55,6 @@ impl NymConfig for Config {
         config_template()
     }
 
-    fn config_file_name() -> String {
-        "config.toml".to_string()
-    }
-
     fn default_root_directory() -> PathBuf {
         dirs::home_dir()
             .expect("Failed to evaluate $HOME value")

clients/native/src/commands/init.rs

@@ -25,6 +25,7 @@ use gateway_requests::registration::handshake::SharedKeys;
 use rand::rngs::OsRng;
 use rand::seq::SliceRandom;
 use std::convert::TryInto;
+use std::process;
 use std::sync::Arc;
 use std::time::Duration;
 use topology::{gateway, NymTopology};
@@ -131,7 +132,14 @@ pub fn execute(matches: &ArgMatches) {
     println!("Initialising client...");
 
     let id = matches.value_of("id").unwrap(); // required for now
+
+    if Config::default_config_file_path(id).exists() {
+        eprintln!("Client \"{}\" was already initialised before! If you wanted to upgrade your client to most recent version, try `upgrade` command instead!", id);
+        process::exit(1);
+    }
+
     let mut config = Config::new(id);
+
     let mut rng = OsRng;
 
     // TODO: ideally that should be the last thing that's being done to config.

clients/socks5/src/client/config/mod.rs

@@ -38,10 +38,6 @@ impl NymConfig for Config {
         config_template()
     }
 
-    fn config_file_name() -> String {
-        "config.toml".to_string()
-    }
-
     fn default_root_directory() -> PathBuf {
         dirs::home_dir()
             .expect("Failed to evaluate $HOME value")

clients/socks5/src/commands/init.rs

@@ -24,6 +24,7 @@ use gateway_client::GatewayClient;
 use gateway_requests::registration::handshake::SharedKeys;
 use rand::{prelude::SliceRandom, rngs::OsRng};
 use std::convert::TryInto;
+use std::process;
 use std::sync::Arc;
 use std::time::Duration;
 use topology::{gateway, NymTopology};
@@ -134,7 +135,13 @@ pub fn execute(matches: &ArgMatches) {
     let id = matches.value_of("id").unwrap(); // required for now
     let provider_address = matches.value_of("provider").unwrap();
 
+    if Config::default_config_file_path(id).exists() {
+        eprintln!("Socks5 client \"{}\" was already initialised before! If you wanted to upgrade your client to most recent version, try `upgrade` command instead!", id);
+        process::exit(1);
+    }
+
     let mut config = Config::new(id, provider_address);
+
     let mut rng = OsRng;
 
     // TODO: ideally that should be the last thing that's being done to config.

common/config/src/lib.rs

@@ -21,21 +21,23 @@ use std::{fs, io};
 pub trait NymConfig: Default + Serialize + DeserializeOwned {
     fn template() -> &'static str;
 
-    fn config_file_name() -> String;
+    fn config_file_name() -> String {
+        "config.toml".to_string()
+    }
 
     fn default_root_directory() -> PathBuf;
 
     // default, most probable, implementations; can be easily overridden where required
-    fn default_config_directory(id: Option<&str>) -> PathBuf {
-        Self::default_root_directory()
-            .join(id.unwrap_or(""))
-            .join("config")
+    fn default_config_directory(id: &str) -> PathBuf {
+        Self::default_root_directory().join(id).join("config")
     }
 
-    fn default_data_directory(id: Option<&str>) -> PathBuf {
-        Self::default_root_directory()
-            .join(id.unwrap_or(""))
-            .join("data")
+    fn default_data_directory(id: &str) -> PathBuf {
+        Self::default_root_directory().join(id).join("data")
+    }
+
+    fn default_config_file_path(id: &str) -> PathBuf {
+        Self::default_config_directory(id).join(Self::config_file_name())
     }
 
     fn root_directory(&self) -> PathBuf;
@@ -66,10 +68,20 @@ pub trait NymConfig: Default + Serialize + DeserializeOwned {
         )
     }
 
+    // Hopefully should get simplified by https://github.com/nymtech/nym/issues/385
+    // so that `custom_location` could be completely removed
     fn load_from_file(custom_location: Option<PathBuf>, id: Option<&str>) -> io::Result<Self> {
+        if custom_location.is_none() && id.is_none() {
+            return Err(io::Error::new(
+                io::ErrorKind::InvalidInput,
+                "Both custom location and id are unspecified!",
+            ));
+        }
+
+        // unwrap on id can't fail as we just checked whether at least one of custom location or id
+        // is not None
         let config_contents = fs::read_to_string(
-            custom_location
-                .unwrap_or_else(|| Self::default_config_directory(id).join("config.toml")),
+            custom_location.unwrap_or_else(|| Self::default_config_file_path(id.unwrap())),
         )?;
 
         toml::from_str(&config_contents)

gateway/src/commands/init.rs

@@ -14,9 +14,11 @@
 
 use crate::commands::override_config;
 use crate::config::persistence::pathfinder::GatewayPathfinder;
+use crate::config::Config;
 use clap::{App, Arg, ArgMatches};
 use config::NymConfig;
 use crypto::asymmetric::{encryption, identity};
+use std::process;
 
 pub fn command_args<'a, 'b>() -> clap::App<'a, 'b> {
     App::new("init")
@@ -116,7 +118,12 @@ pub fn execute(matches: &ArgMatches) {
     let id = matches.value_of("id").unwrap();
     println!("Initialising gateway {}...", id);
 
-    let mut config = crate::config::Config::new(id);
+    if Config::default_config_file_path(id).exists() {
+        eprintln!("Gateway \"{}\" was already initialised before! If you wanted to upgrade your gateway to most recent version, try `upgrade` command instead!", id);
+        process::exit(1);
+    }
+
+    let mut config = Config::new(id);
 
     config = override_config(config, matches);
 

gateway/src/config/mod.rs

@@ -62,10 +62,6 @@ impl NymConfig for Config {
         config_template()
     }
 
-    fn config_file_name() -> String {
-        "config.toml".to_string()
-    }
-
     fn default_root_directory() -> PathBuf {
         dirs::home_dir()
             .expect("Failed to evaluate $HOME value")
@@ -457,19 +453,19 @@ pub struct Gateway {
 
 impl Gateway {
     fn default_private_sphinx_key_file(id: &str) -> PathBuf {
-        Config::default_data_directory(Some(id)).join("private_sphinx.pem")
+        Config::default_data_directory(id).join("private_sphinx.pem")
     }
 
     fn default_public_sphinx_key_file(id: &str) -> PathBuf {
-        Config::default_data_directory(Some(id)).join("public_sphinx.pem")
+        Config::default_data_directory(id).join("public_sphinx.pem")
     }
 
     fn default_private_identity_key_file(id: &str) -> PathBuf {
-        Config::default_data_directory(Some(id)).join("private_identity.pem")
+        Config::default_data_directory(id).join("private_identity.pem")
     }
 
     fn default_public_identity_key_file(id: &str) -> PathBuf {
-        Config::default_data_directory(Some(id)).join("public_identity.pem")
+        Config::default_data_directory(id).join("public_identity.pem")
     }
 
     fn default_location() -> String {
@@ -545,11 +541,11 @@ pub struct ClientsEndpoint {
 
 impl ClientsEndpoint {
     fn default_inboxes_directory(id: &str) -> PathBuf {
-        Config::default_data_directory(Some(id)).join("inboxes")
+        Config::default_data_directory(id).join("inboxes")
     }
 
     fn default_ledger_path(id: &str) -> PathBuf {
-        Config::default_data_directory(Some(id)).join("client_ledger.sled")
+        Config::default_data_directory(id).join("client_ledger.sled")
     }
 }
 

mixnode/src/commands/init.rs

@@ -14,6 +14,7 @@
 
 use crate::commands::override_config;
 use crate::config::persistence::pathfinder::MixNodePathfinder;
+use crate::config::Config;
 use clap::{App, Arg, ArgMatches};
 use config::NymConfig;
 use crypto::asymmetric::{encryption, identity};
@@ -21,6 +22,7 @@ use directory_client::DirectoryClient;
 use log::*;
 use nymsphinx::params::DEFAULT_NUM_MIX_HOPS;
 use std::convert::TryInto;
+use std::process;
 use tokio::runtime::Runtime;
 use topology::NymTopology;
 
@@ -134,7 +136,13 @@ pub fn execute(matches: &ArgMatches) {
     rt.block_on(async {
         let id = matches.value_of("id").unwrap();
         println!("Initialising mixnode {}...", id);
-        let mut config = crate::config::Config::new(id);
+
+        if Config::default_config_file_path(id).exists() {
+            eprintln!("Mixnode \"{}\" was already initialised before! If you wanted to upgrade your node to most recent version, try `upgrade` command instead!", id);
+            process::exit(1);
+        }
+
+        let mut config = Config::new(id);
         config = override_config(config, matches);
         let layer = choose_layer(matches, config.get_presence_directory_server()).await;
         // TODO: I really don't like how we override config and are presumably done with it

mixnode/src/config/mod.rs

@@ -56,10 +56,6 @@ impl NymConfig for Config {
         config_template()
     }
 
-    fn config_file_name() -> String {
-        "config.toml".to_string()
-    }
-
     fn default_root_directory() -> PathBuf {
         dirs::home_dir()
             .expect("Failed to evaluate $HOME value")
@@ -377,11 +373,11 @@ impl MixNode {
     }
 
     fn default_private_sphinx_key_file(id: &str) -> PathBuf {
-        Config::default_data_directory(Some(id)).join("private_sphinx.pem")
+        Config::default_data_directory(id).join("private_sphinx.pem")
     }
 
     fn default_public_sphinx_key_file(id: &str) -> PathBuf {
-        Config::default_data_directory(Some(id)).join("public_sphinx.pem")
+        Config::default_data_directory(id).join("public_sphinx.pem")
     }
 
     fn default_location() -> String {