(feat:background) Fix Rust-based file download & Create the 'bg' directory on app setup

src-tauri/Cargo.toml

@@ -13,10 +13,12 @@ edition = "2021"
 tauri-build = { version = "1.5", features = [] }
 
 [dependencies]
-tauri = { version = "1.5", features = ["shell-open"] }
+tauri = { version = "1.5", features = [ "api-all"] }
 serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0"
 
+reqwest = "0.11.22"
+
 [features]
 # this feature is used for production builds or when `devPath` points to the filesystem
 # DO NOT REMOVE!!

src-tauri/src/http.rs

@@ -1,4 +1,3 @@
-use core::error::Error;
 use std::fs::File;
 use std::io::Write;
 use std::path::Path;
@@ -9,17 +8,20 @@ use std::path::Path;
 /// url: The URL to download from.
 /// to_file: The file to save to.
 #[tauri::command]
-pub async fn download_file(url: String, to_file: String) -> Result<String, Box<dyn Error>> {
-    let mut response = reqwest::get(&url).await?;
+pub async fn download_file(url: String, to_file: String) -> Result<String, String> {
+    let mut response = reqwest::get(&url).await
+        .expect("Failed to send request");
     let mut dest = {
         let fname = Path::new(&to_file);
         match File::create(&fname) {
             Ok(f) => f,
-            Err(e) => return Err(Box::new(e)),
+            Err(_) => return Err("Failed to create file".to_string()),
         }
     };
-    while let Some(chunk) = response.chunk().await? {
-        dest.write_all(&chunk).await?;
+    while let Some(chunk) = response.chunk().await
+        .expect("Unable to read chunk") {
+        dest.write_all(&chunk)
+            .expect("Failed to write chunk to file")
     }
     Ok("Downloaded".to_string())
 }

src-tauri/src/main.rs

@@ -1,15 +1,29 @@
 // Prevents additional console window on Windows in release, DO NOT REMOVE!!
 #![cfg_attr(not(debug_assertions), windows_subsystem = "windows")]
 
-// Learn more about Tauri commands at https://tauri.app/v1/guides/features/command
-#[tauri::command]
-fn greet(name: &str) -> String {
-    format!("Hello, {}! You've been greeted from Rust!", name)
-}
+use std::fs::create_dir;
+
+mod http;
 
 fn main() {
     tauri::Builder::default()
-        .invoke_handler(tauri::generate_handler![greet])
+        .invoke_handler(tauri::generate_handler![
+            http::download_file
+        ])
+        .setup(|app| {
+            // Create base directories.
+            let app_data_dir = app.path_resolver()
+                .app_data_dir()
+                .expect("Failed to get app data directory");
+
+            let background_directory = app_data_dir.join("bg");
+            if !background_directory.exists() {
+                create_dir(background_directory.as_path())
+                    .expect("Failed to create app data directory");
+            }
+
+            Ok(())
+        })
         .run(tauri::generate_context!())
         .expect("error while running tauri application");
 }