1 files changed, 85 insertions, 0 deletions
diff --git a/systems/_asset/src/rw.rs b/systems/_asset/src/rw.rs
new file mode 100644
index 0000000..784d44d
--- /dev/null
+++ b/systems/_asset/src/rw.rs
@@ -0,0 +1,85 @@
+use std::path::PathBuf;
+
+use crate::error::{DataReadError, DataWriteError};
+
+pub trait RWData<DataType> {
+    type DataType;
+
+    /// Implement read logic
+    /// Given a path, return the specific data
+    fn read(path: &PathBuf) -> impl Future<Output = Result<DataType, DataReadError>> + Send + Sync;
+
+    /// Implement write logic
+    /// Given data and a path, write to the filesystem
+    fn write(
+        data: DataType,
+        path: &PathBuf,
+    ) -> impl Future<Output = Result<(), DataWriteError>> + Send + Sync;
+
+    /// Provide test data
+    fn test_data() -> DataType;
+
+    /// Given two sets of data, determine if they are equal
+    ///
+    /// Add RWDataTest derive to your struct to automatically generate tests
+    /// ```ignore
+    /// #[derive(RWDataTest)]
+    /// struct FooData;
+    /// ```
+    fn verify_data(data_a: DataType, data_b: DataType) -> bool;
+}
+
+#[macro_export]
+macro_rules! ensure_eq {
+    ($a:expr, $b:expr) => {
+        if $a != $b {
+            return false;
+        }
+    };
+}
+
+// Test Data
+pub struct FooData {
+    pub age: i32,
+    pub name: String,
+}
+
+impl RWData<FooData> for FooData {
+    type DataType = FooData;
+
+    async fn read(path: &PathBuf) -> Result<FooData, DataReadError> {
+        let content = tokio::fs::read_to_string(path)
+            .await
+            .map_err(|e| DataReadError::IoError(e))?;
+        let parts: Vec<&str> = content.split('=').collect();
+        if parts.len() != 2 {
+            return Err(DataReadError::ParseError("Invalid format".to_string()));
+        }
+        let name = parts[0].to_string();
+        let age: i32 = parts[1]
+            .parse()
+            .map_err(|_| DataReadError::ParseError("Invalid age".to_string()))?;
+        Ok(FooData { age, name })
+    }
+
+    async fn write(data: FooData, path: &PathBuf) -> Result<(), DataWriteError> {
+        let content = format!("{}={}", data.name, data.age);
+        tokio::fs::write(path, content)
+            .await
+            .map_err(|e| DataWriteError::IoError(e))?;
+        Ok(())
+    }
+
+    fn test_data() -> FooData {
+        FooData {
+            age: 24,
+            name: "OneOneFourFiveOneFour".to_string(),
+        }
+    }
+
+    fn verify_data(data_a: FooData, data_b: FooData) -> bool {
+        crate::ensure_eq!(data_a.age, data_b.age);
+        crate::ensure_eq!(data_a.name, data_b.name);
+        return true;
+    }
+}