Merge pull request #2855 from uProxy/dborkan-zork-metrics-file

Setting isMetricsEnabled flag in Zork Firefox app based on options file

Author: dborkan

src/lib/samples/zork-firefoxapp/index.js

@@ -1,16 +1,40 @@
 const {Cu} = require("chrome");
 var self = require("sdk/self");
 var {setTimeout} = require("sdk/timers");
+const {TextDecoder, OS} = Cu.import("resource://gre/modules/osfile.jsm", {});
 
 Cu.import(self.data.url("freedom-for-firefox/freedom-for-firefox.jsm"));
 
+const OPTIONS_FILE_PATH = '/zork-options';
+
+// Returns Promise<boolean>
+function checkIfMetricsEnabled() {
+  return OS.File.read(OPTIONS_FILE_PATH).then((array) => {
+    try {
+      const decoder = new TextDecoder();
+      const text = decoder.decode(array);
+      const options = JSON.parse(text);
+      return options['isMetricsEnabled'] === true;
+    } catch (e) {
+      console.error('Could not parse options file');
+      return false;
+    }
+  }).catch((e) => {
+    console.warn('Could not find options file');
+    return false;  // Options file not found, not an error.
+  });
+}
+
 var manifest = self.data.url("lib/zork/freedom-module.json");
 var loggingProviderManifest = self.data.url("lib/loggingprovider/freedom-module.json");
 freedom(manifest, {
   'logger': loggingProviderManifest,
   'debug': 'debug'
 }).then(function(moduleFactory) {
-  moduleFactory();
+  const provider = moduleFactory();
+  checkIfMetricsEnabled().then(function(isEnabled) {
+    provider.emit('setMetricsEnablement', isEnabled);
+  });
 }, function() {
   console.error('could not load freedomjs module');
 });

src/lib/zork/freedom-module.ts

@@ -43,6 +43,14 @@ var PORTS = [9000, 9010, 9020];
 // Number of getters.
 let numOfGetters = 0;
 
+let isMetricsEnabled = false;
+if (typeof freedom !== 'undefined') {
+  const parentFreedomModule = freedom();
+  parentFreedomModule.on('setMetricsEnablement', function(newValue) {
+    isMetricsEnabled = newValue;
+  });
+}
+
 // Starts a TCP server on the first free port listed in PORTS.
 // Rejects if no port is free.
 function bind(i:number = 0) : Promise<tcp.Server> {