refactor: extract handlers to handlers/ directory

backend/src/models/messages.rs

@@ -0,0 +1,29 @@
+use serde::{Deserialize, Serialize};
+
+use super::executable::ExecutableJson;
+use super::session::Session;
+
+#[derive(Debug, Deserialize)]
+#[serde(tag = "type", rename_all = "kebab-case")]
+pub enum IncomingMessage {
+    // A request from the client to delete a download token
+    DeleteDownloadToken { id: u32 },
+}
+
+#[derive(Debug, Serialize)]
+#[serde(tag = "type", rename_all = "kebab-case")]
+pub enum OutgoingMessage {
+    // An alert to the client that a session download has been used.
+    #[serde(rename = "notify")]
+    TokenAlert {
+        token: u32,
+    },
+    // A message describing the current session state
+    State {
+        session: Session,
+    },
+    Executables {
+        build_log: Option<String>,
+        executables: Vec<ExecutableJson>,
+    },
+}