add: initial plugin manager

src/plugins.rs

@@ -0,0 +1,57 @@
+use std::{collections::HashMap, path::Path, sync::Arc, ffi::CStr};
+
+use hbb_common::anyhow::{anyhow, Error};
+use lazy_static::lazy_static;
+
+lazy_static! {
+    pub static ref PLUGIN_REGISTRAR: Arc<PluginRegistar<PluginImpl>> =
+        Arc::new(PluginRegistar::<PluginImpl>::default());
+}
+
+pub trait Plugin {
+    // Return: the unique ID which identifies this plugin.
+    fn plugin_id(&self) -> String;
+    // Return: the name which is human-readable.
+    fn plugin_name(&self) -> String;
+}
+
+#[derive(Default, Clone)]
+pub struct PluginImpl {
+    id: String,
+    name: String,
+}
+
+impl Plugin for PluginImpl {
+    fn plugin_id(&self) -> String {
+        self.id.to_owned()
+    }
+
+    fn plugin_name(&self) -> String {
+        self.name.to_owned()
+    }
+}
+
+#[derive(Default, Clone)]
+pub struct PluginRegistar<P: Plugin> {
+    plugins: HashMap<String, P>,
+}
+
+impl<P: Plugin> PluginRegistar<P> {
+    pub fn load_plugin(&self, path: *const i8) -> i32 {
+        let p = unsafe { CStr::from_ptr(path) };
+        0
+    }
+
+    pub fn unload_plugin(&self, path: *const i8) -> i32 {
+        let p = unsafe { CStr::from_ptr(path) };
+        0
+    }
+}
+
+impl TryFrom<&Path> for PluginImpl {
+    type Error = Error;
+
+    fn try_from(value: &Path) -> Result<Self, Self::Error> {
+        Err(anyhow!("Not implemented yet."))
+    }
+}