[fuchsia] Add dummy setAssetBundle service extension (#4945)

Author: zanderso

content_handler/service_protocol_hooks.cc

@@ -17,6 +17,32 @@ namespace flutter_runner {
 namespace {
 
 constexpr char kViewIdPrefx[] = "_flutterView/";
+constexpr size_t kViewIdPrefxLength = sizeof(kViewIdPrefx) - 1;
+
+static intptr_t KeyIndex(const char** param_keys,
+                         intptr_t num_params,
+                         const char* key) {
+  if (param_keys == NULL) {
+    return -1;
+  }
+  for (intptr_t i = 0; i < num_params; i++) {
+    if (strcmp(param_keys[i], key) == 0) {
+      return i;
+    }
+  }
+  return -1;
+}
+
+static const char* ValueForKey(const char** param_keys,
+                               const char** param_values,
+                               intptr_t num_params,
+                               const char* key) {
+  intptr_t index = KeyIndex(param_keys, num_params, key);
+  if (index < 0) {
+    return NULL;
+  }
+  return param_values[index];
+}
 
 static void AppendIsolateRef(std::stringstream* stream,
                              int64_t main_port,
@@ -47,6 +73,9 @@ void ServiceProtocolHooks::RegisterHooks(bool running_precompiled_code) {
   // Listing of FlutterViews.
   Dart_RegisterRootServiceRequestCallback(kListViewsExtensionName, &ListViews,
                                           nullptr);
+
+  Dart_RegisterRootServiceRequestCallback(kSetAssetBundlePathExtensionName,
+                                          &SetAssetBundlePath, nullptr);
 }
 
 const char* ServiceProtocolHooks::kListViewsExtensionName =
@@ -88,4 +117,48 @@ bool ServiceProtocolHooks::ListViews(const char* method,
   return true;
 }
 
+const char* ServiceProtocolHooks::kSetAssetBundlePathExtensionName =
+    "_flutter.setAssetBundlePath";
+
+bool ServiceProtocolHooks::SetAssetBundlePath(const char* method,
+                                              const char** param_keys,
+                                              const char** param_values,
+                                              intptr_t num_params,
+                                              void* user_data,
+                                              const char** json_object) {
+  const char* view_id_str =
+      ValueForKey(param_keys, param_values, num_params, "viewId");
+
+  // Ask the App for the list of platform views. This will run a task on
+  // the UI thread before returning.
+  App& app = App::Shared();
+  std::vector<App::PlatformViewInfo> platform_views;
+  app.WaitForPlatformViewIds(&platform_views);
+
+  // Convert the actual flutter view hex id into a number.
+  uintptr_t view_id_as_num =
+      std::stoull((view_id_str + kViewIdPrefxLength), nullptr, 16);
+
+  // The view existed and the isolate was created. Success.
+  std::stringstream response;
+  response << "{\"type\":\"Success\","
+           << "\"view\":";
+  for (auto it = platform_views.begin(); it != platform_views.end(); it++) {
+    uintptr_t view_id = it->view_id;
+    int64_t isolate_id = it->isolate_id;
+    const std::string& isolate_name = it->isolate_name;
+    if (!view_id || view_id != view_id_as_num) {
+      continue;
+    }
+
+    // TODO(DX): Set up asset bundle path for the isolate.
+
+    AppendFlutterView(&response, view_id, isolate_id, isolate_name);
+    break;
+  }
+  response << "}";
+  *json_object = strdup(response.str().c_str());
+  return true;
+}
+
 }  // namespace flutter_runner

content_handler/service_protocol_hooks.h

@@ -22,6 +22,14 @@ class ServiceProtocolHooks {
                         intptr_t num_params,
                         void* user_data,
                         const char** json_object);
+
+  static const char* kSetAssetBundlePathExtensionName;
+  static bool SetAssetBundlePath(const char* method,
+                                 const char** param_keys,
+                                 const char** param_values,
+                                 intptr_t num_params,
+                                 void* user_data,
+                                 const char** json_object);
 };
 
 }  // namespace flutter_runner