1 files changed, 75 insertions, 0 deletions
diff --git a/devtools/client/fronts/eventsource.js b/devtools/client/fronts/eventsource.js
new file mode 100644
index 0000000000..43b667dcd0
--- /dev/null
+++ b/devtools/client/fronts/eventsource.js
@@ -0,0 +1,75 @@
+/* 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/. */
+
+"use strict";
+
+const {
+  FrontClassWithSpec,
+  registerFront,
+} = require("resource://devtools/shared/protocol.js");
+const {
+  eventSourceSpec,
+} = require("resource://devtools/shared/specs/eventsource.js");
+
+/**
+ * A EventSourceFront is used as a front end for the EventSourceActor that is
+ * created on the server, hiding implementation details.
+ */
+class EventSourceFront extends FrontClassWithSpec(eventSourceSpec) {
+  constructor(client, targetFront, parentFront) {
+    super(client, targetFront, parentFront);
+
+    this._onEventSourceConnectionClosed = this._onEventSourceConnectionClosed.bind(
+      this
+    );
+    this._onEventReceived = this._onEventReceived.bind(this);
+
+    // Attribute name from which to retrieve the actorID
+    // out of the target actor's form
+    this.formAttributeName = "eventSourceActor";
+
+    this.on(
+      "serverEventSourceConnectionClosed",
+      this._onEventSourceConnectionClosed
+    );
+    this.on("serverEventReceived", this._onEventReceived);
+  }
+
+  /**
+   * Close the EventSourceFront.
+   */
+  destroy() {
+    this.off("serverEventSourceConnectionClosed");
+    this.off("serverEventReceived");
+    return super.destroy();
+  }
+
+  /**
+   * The "eventSourceConnectionClosed" message type handler. We redirect any message to
+   * the UI for displaying.
+   *
+   * @private
+   * @param number httpChannelId
+   */
+  async _onEventSourceConnectionClosed(httpChannelId) {
+    this.emit("eventSourceConnectionClosed", httpChannelId);
+  }
+
+  /**
+   * The "eventReceived" message type handler. We redirect any message to
+   * the UI for displaying.
+   *
+   * @private
+   * @param string httpChannelId
+   *        Channel ID of the eventSource connection.
+   * @param object data
+   *        The data received from the server.
+   */
+  async _onEventReceived(httpChannelId, data) {
+    this.emit("eventReceived", httpChannelId, data);
+  }
+}
+
+exports.EventSourceFront = EventSourceFront;
+registerFront(EventSourceFront);