implement cache/clean api

src/list.rs

@@ -90,4 +90,9 @@ impl List {
         self.cache.block(rule).await?;
         Ok(self.index.write().await.remove(&Item::from_line(rule)))
     }
+    /// Privately clean `--cache` file collected, return deleted rules
+    /// * we can implement `self.index` update at this step @TODO
+    pub async fn cache_clean(&self) -> Result<Option<Vec<String>>> {
+        self.cache.clean().await
+    }
 }

src/list/cache.rs

@@ -49,6 +49,22 @@ impl Cache {
         }
         Ok(())
     }
+    /// Clean `--cache` file collected, return deleted rules
+    pub async fn clean(&self) -> Result<Option<Vec<String>>> {
+        match self.0 {
+            Some(ref p) => {
+                init_file(p).await?;
+                let mut rules = Vec::new();
+                let lines = fs::read_to_string(p).await?;
+                for line in lines.lines() {
+                    rules.push(line.into());
+                }
+                fs::write(p, "").await?;
+                Ok(Some(rules))
+            }
+            None => Ok(None),
+        }
+    }
 }
 
 /// Make sure that cache file is always exist (e.g. user may remove it when the daemon is running)

src/main.rs

@@ -56,6 +56,16 @@ async fn api_block(
     })?))
 }
 
+#[rocket::get("/api/cache/clean")]
+async fn api_cache_clean(list: &State<Arc<List>>) -> Result<Json<Option<Vec<String>>>, Status> {
+    let result = list.cache_clean().await;
+    info!("Clean cache file: {result:?}");
+    Ok(Json(result.map_err(|e| {
+        error!("Could not handle cache clean request: `{e}`");
+        Status::InternalServerError
+    })?))
+}
+
 #[rocket::launch]
 async fn rocket() -> _ {
     env_logger::init();
@@ -91,7 +101,7 @@ async fn rocket() -> _ {
         .manage(Instant::now())
         .mount(
             "/",
-            rocket::routes![index, api_totals, api_allow, api_block],
+            rocket::routes![index, api_totals, api_allow, api_block, api_cache_clean],
         )
 }