App refactor (#140)

* Add additional types
* Split components from single index module into smaller modules
* Misc smaller changes

app/src/bridge/components/receiverSelector.ts

@@ -0,0 +1,88 @@
+"use strict";
+
+import child_process from "child_process";
+import path from "path";
+
+import { sendMessage } from "../lib/messaging";
+
+
+function fatal (message: string) {
+    console.error(message);
+    process.exit(1);
+}
+
+
+let selectorApp: child_process.ChildProcess | undefined;
+let selectorAppOpen = false;
+
+export function startReceiverSelector (data: string) {
+    if (process.platform !== "darwin") {
+        fatal("Invalid platform for native receiver selector.");
+    }
+
+    if (!data) {
+        fatal("Missing native selector data");
+    } else {
+        try {
+            JSON.parse(data);
+        } catch (err) {
+            fatal("Invalid native selector data.");
+        }
+    }
+
+    if (selectorApp && selectorAppOpen) {
+        selectorApp.kill();
+        selectorAppOpen = false;
+    }
+
+    const selectorPath = path.join(process.cwd()
+          , "fx_cast_selector.app/Contents/MacOS/fx_cast_selector");
+ 
+    selectorApp = child_process.spawn(selectorPath, [ data ]);
+    selectorAppOpen = true;
+
+    if (selectorApp.stdout) {
+        selectorApp.stdout.setEncoding("utf-8");    
+        selectorApp.stdout.on("data", data => {
+            const jsonData = JSON.parse(data);
+
+            if (!jsonData.mediaType) {
+                sendMessage({
+                    subject: "main:/receiverSelector/stop"
+                  , data: jsonData
+                });
+
+                return;
+            }
+
+            sendMessage({
+                subject: "main:/receiverSelector/selected"
+              , data: jsonData
+            });
+        });
+    }
+
+    selectorApp.on("error", err => {
+        sendMessage({
+            subject: "main:/receiverSelector/error"
+          , data: err.message
+        });
+    });
+
+    selectorApp.on("close", () => {
+        if (selectorAppOpen) {
+            selectorAppOpen = false;
+
+            sendMessage({
+                subject: "main:/receiverSelector/close"
+            });
+        }
+    });
+}
+
+export function stopReceiverSelector () {
+    if (!selectorApp?.killed) {
+        selectorApp?.kill();
+        selectorAppOpen = false;
+    }
+}