1 files changed, 66 insertions, 0 deletions
diff --git a/devtools/client/webconsole/net/data-provider.js b/devtools/client/webconsole/net/data-provider.js
new file mode 100644
index 000000000..d8a70d72d
--- /dev/null
+++ b/devtools/client/webconsole/net/data-provider.js
@@ -0,0 +1,66 @@
+/* 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 promise = require("promise");
+
+/**
+ * Map of pending requests. Used mainly by tests to wait
+ * till things are ready.
+ */
+var promises = new Map();
+
+/**
+ * This object is used to fetch network data from the backend.
+ * Communication with the chrome scope is based on message
+ * exchange.
+ */
+var DataProvider = {
+  hasPendingRequests: function () {
+    return promises.size > 0;
+  },
+
+  requestData: function (client, actor, method) {
+    let key = actor + ":" + method;
+    let p = promises.get(key);
+    if (p) {
+      return p;
+    }
+
+    let deferred = promise.defer();
+    let realMethodName = "get" + method.charAt(0).toUpperCase() +
+      method.slice(1);
+
+    if (!client[realMethodName]) {
+      return null;
+    }
+
+    client[realMethodName](actor, response => {
+      promises.delete(key);
+      deferred.resolve(response);
+    });
+
+    promises.set(key, deferred.promise);
+    return deferred.promise;
+  },
+
+  resolveString: function (client, stringGrip) {
+    let key = stringGrip.actor + ":getString";
+    let p = promises.get(key);
+    if (p) {
+      return p;
+    }
+
+    p = client.getString(stringGrip).then(result => {
+      promises.delete(key);
+      return result;
+    });
+
+    promises.set(key, p);
+    return p;
+  },
+};
+
+// Exports from this module
+module.exports = DataProvider;