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src/Switcher.ts

@@ -0,0 +1,67 @@
+import { BareTransport } from "./BareTypes";
+
+self.BCC_VERSION = "2.1.3";
+console.warn("BCC_VERSION: " + self.BCC_VERSION);
+
+if (!("gTransports" in globalThis)) {
+  globalThis.gTransports = {};
+}
+
+
+declare global {
+  interface ServiceWorkerGlobalScope {
+    gSwitcher: Switcher;
+    BCC_VERSION: string;
+    BCC_DEBUG: boolean;
+  }
+  interface WorkerGlobalScope {
+    gSwitcher: Switcher;
+    BCC_VERSION: string;
+    BCC_DEBUG: boolean;
+  }
+  interface Window {
+    gSwitcher: Switcher;
+    BCC_VERSION: string;
+    BCC_DEBUG: boolean;
+  }
+}
+
+class Switcher {
+  transports: Record<string, BareTransport> = {};
+  active: BareTransport | null = null;
+}
+
+export function findSwitcher(): Switcher {
+  if (globalThis.gSwitcher) return globalThis.gSwitcher;
+
+  for (let i = 0; i < 20; i++) {
+    try {
+      parent = parent.parent;
+      if (parent && parent["gSwitcher"]) {
+        console.warn("found implementation on parent");
+        globalThis.gSwitcher = parent["gSwitcher"];
+        return parent["gSwitcher"];
+      }
+    } catch (e) {
+
+      globalThis.gSwitcher = new Switcher;
+      return globalThis.gSwitcher;
+    }
+  }
+
+  throw "unreachable";
+}
+
+export function AddTransport(name: string, client: BareTransport) {
+
+  let switcher = findSwitcher();
+
+  switcher.transports[name] = client;
+  if (!switcher.active)
+    switcher.active = switcher.transports[name];
+}
+
+export function SetTransport(name: string) {
+  let switcher = findSwitcher();
+  switcher.active = switcher.transports[name];
+}