add client data cache for ip and username

src/rsc.rs

@@ -0,0 +1,59 @@
+use std::{
+    fs::{self, File},
+    path::Path,
+};
+
+use directories_next::ProjectDirs;
+
+use crate::net::BINCODE_CONFIG;
+
+pub const CLIENT_DATA: &str = "client_data";
+
+pub struct DataDir {
+    dirs: ProjectDirs,
+}
+
+impl Default for DataDir {
+    fn default() -> Self {
+        Self {
+            dirs: ProjectDirs::from("", "", "openworm").unwrap(),
+        }
+    }
+}
+
+impl DataDir {
+    pub fn get(&self) -> &Path {
+        self.dirs.data_local_dir()
+    }
+
+    pub fn load<T: bincode::Decode<()> + Default>(&self, path: &str) -> T {
+        let path = self.get().join(path);
+        match fs::read(path) {
+            Ok(bytes) => match bincode::decode_from_slice(&bytes, BINCODE_CONFIG) {
+                Ok((data, _)) => data,
+                Err(_) => todo!(),
+            },
+            Err(_) => T::default(),
+        }
+    }
+
+    pub fn save<T: bincode::Encode>(&self, path: &str, data: &T) {
+        let mut file = File::create(self.get().join(path)).unwrap();
+        bincode::encode_into_std_write(data, &mut file, BINCODE_CONFIG).unwrap();
+    }
+}
+
+#[derive(bincode::Encode, bincode::Decode)]
+pub struct ClientData {
+    pub ip: String,
+    pub username: String,
+}
+
+impl Default for ClientData {
+    fn default() -> Self {
+        Self {
+            ip: "localhost:39420".to_string(),
+            username: "your [NOVEMBER]".to_string(),
+        }
+    }
+}