Add protocol names to host-side panel binding

src/backend/mod.rs

@@ -36,10 +36,11 @@ pub trait Instance {
     /// Binds script data to a Canary panel.
     ///
     /// To "bind" a Canary panel to a Canary script, this function must be
-    /// called. It passes the ID of a panel to the script, plus an
+    /// called. It passes the ID of a panel to the script, the name of the
-    /// initialization message, and the script returns an integer as
+    /// protocol that this panel will be using, plus an initialization
-    /// userdata. All panel events will be identified to the script with this
+    /// message, and the script returns an integer as userdata. All panel
-    /// userdata as the first argument.
+    /// events will be identified to the script with this userdata as the first
+    /// argument.
     ///
     /// The intended usecase for this userdata is to contain a pointer. A
     /// Canary script can allocate some high-level object in memory, and when
@@ -47,7 +48,7 @@ pub trait Instance {
     /// userdata. Then, when the runtime calls back into the script, the
     /// userdata will be reinterpreted as a pointer and a method can be called
     /// on that object in memory.
-    fn bind_panel(&self, panel: PanelId, msg: Vec<u8>) -> u32;
+    fn bind_panel(&self, panel: PanelId, protocol: String, msg: Vec<u8>) -> u32;
 
     fn update(&self, panel_ud: u32, dt: f32);
 

src/backend/wasmtime.rs

@@ -61,7 +61,7 @@ impl Backend for WasmtimeBackend {
 
 pub struct WasmtimeInstance {
     store: Mutex<Store>,
-    bind_panel: wasmtime::TypedFunc<(u32, u32), u32>,
+    bind_panel: wasmtime::TypedFunc<(u32, u32, u32), u32>,
     update: wasmtime::TypedFunc<(u32, f32), ()>,
     draw: wasmtime::TypedFunc<u32, ()>,
     on_resize: wasmtime::TypedFunc<(u32, f32, f32), ()>,
@@ -189,11 +189,13 @@ impl WasmtimeInstance {
 }
 
 impl Instance for WasmtimeInstance {
-    fn bind_panel(&self, panel: PanelId, msg: Vec<u8>) -> u32 {
+    fn bind_panel(&self, panel: PanelId, protocol: String, msg: Vec<u8>) -> u32 {
         let mut store = self.store.lock();
+        let protocol = store.data().message_new(protocol.as_bytes().to_vec());
         let msg = store.data().message_new(msg);
-        let args = (panel.0 as u32, msg);
+        let args = (panel.0 as u32, protocol, msg);
         let data = self.bind_panel.call(store.deref_mut(), args).unwrap();
+        store.data().message_free(protocol);
         store.data().message_free(msg);
         data
     }

src/lib.rs

@@ -45,10 +45,10 @@ pub struct Script {
 }
 
 impl Script {
-    pub fn create_panel(&mut self, msg: Vec<u8>) -> anyhow::Result<Panel> {
+    pub fn create_panel(&mut self, protocol: String, msg: Vec<u8>) -> anyhow::Result<Panel> {
         let id = PanelId(self.next_panel);
         self.next_panel += 1;
-        let userdata = self.instance.bind_panel(id, msg);
+        let userdata = self.instance.bind_panel(id, protocol, msg);
         Ok(Panel {
             instance: self.instance.clone(),
             id,