feat: add native session handlers

src/plugin/native_handlers/mod.rs

@@ -0,0 +1,24 @@
+use std::ffi::{c_void, c_ulonglong, c_ulong};
+
+use serde_json::Map;
+
+pub mod session;
+
+pub type NR = super::native::NativeReturnValue;
+pub type PluginNativeHandlerRegistrar = NativeHandlerRegistrar<dyn PluginNativeHandler>;
+
+pub struct NativeHandlerRegistrar<H>{
+    handlers: Vec<H>
+}
+
+pub(crate) trait PluginNativeHandler {
+    /// Try to handle the method with the given data.
+    /// 
+    /// Returns: None for the message does not be handled by this handler.
+    fn on_message(method: &String, data: &Map<String, serde_json::Value>) -> Option<NR>;
+
+    /// Try to handle the method with the given data and extra void binary data.
+    /// 
+    /// Returns: None for the message does not be handled by this handler.
+    fn on_message_raw(method: &String, data: &Map<String, serde_json::Value>, raw: *const c_void, raw_len: usize) -> Option<NR>; 
+}