1 files changed, 27 insertions, 0 deletions
diff --git a/remote/shared/messagehandler/sessiondata/SessionDataReader.sys.mjs b/remote/shared/messagehandler/sessiondata/SessionDataReader.sys.mjs
new file mode 100644
index 0000000000..6d5ea08e59
--- /dev/null
+++ b/remote/shared/messagehandler/sessiondata/SessionDataReader.sys.mjs
@@ -0,0 +1,27 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+const lazy = {};
+
+ChromeUtils.defineESModuleGetters(lazy, {
+  SESSION_DATA_SHARED_DATA_KEY:
+    "chrome://remote/content/shared/messagehandler/sessiondata/SessionData.sys.mjs",
+});
+
+ChromeUtils.defineLazyGetter(lazy, "sharedData", () => {
+  const isInParent =
+    Services.appinfo.processType == Ci.nsIXULRuntime.PROCESS_TYPE_DEFAULT;
+
+  return isInParent ? Services.ppmm.sharedData : Services.cpmm.sharedData;
+});
+
+/**
+ * Returns a snapshot of the session data map, which is cloned from the
+ * sessionDataMap singleton of SessionData.jsm.
+ *
+ *  @returns {Map.<string, Array<SessionDataItem>>}
+ *     Map of session id to arrays of SessionDataItems.
+ */
+export const readSessionData = () =>
+  lazy.sharedData.get(lazy.SESSION_DATA_SHARED_DATA_KEY) || new Map();