Bug 806611 - Control wifi debug output based on a setting. r=vchang

--HG--
extra : rebase_source : 972a0956b02c7e6312ba0325d8fde1a4ee9a971d

dom/wifi/WifiWorker.js

@@ -11,7 +11,7 @@ const {classes: Cc, interfaces: Ci, utils: Cu, results: Cr} = Components;
 Cu.import("resource://gre/modules/XPCOMUtils.jsm");
 Cu.import("resource://gre/modules/Services.jsm");
 
-const DEBUG = false; // set to true to show debug messages
+var DEBUG = false; // set to true to show debug messages
 
 const WIFIWORKER_CONTRACTID = "@mozilla.org/wifi/worker;1";
 const WIFIWORKER_CID        = Components.ID("{a14e8977-d259-433a-a88d-58dd44657e5b}");
@@ -1835,9 +1835,28 @@ function WifiWorker() {
     handleError: function handleError(aErrorMessage) {
       debug("Error reading the 'wifi.enabled' setting. Default to wifi on.");
       self.setWifiEnabled({enabled: true});
-    },
+    }
   };
-  gSettingsService.createLock().get("wifi.enabled", initWifiEnabledCb);
+
+  var initWifiDebuggingEnabledCb = {
+    handle: function handle(aName, aResult) {
+      if (aName !== "wifi.debugging.enabled")
+        return;
+      if (aResult === null)
+        aResult = false;
+      DEBUG = aResult;
+      updateDebug();
+    },
+    handleError: function handleError(aErrorMessage) {
+      debug("Error reading the 'wifi.debugging.enabled' setting. Default to debugging off.");
+      DEBUG = false;
+      updateDebug();
+    }
+  };
+
+  let lock = gSettingsService.createLock();
+  lock.get("wifi.enabled", initWifiEnabledCb);
+  lock.get("wifi.debugging.enabled", initWifiDebuggingEnabledCb);
 }
 
 function translateState(state) {
@@ -2572,6 +2591,11 @@ WifiWorker.prototype = {
     }
 
     let setting = JSON.parse(data);
+    if (setting.key === "wifi.debugging.enabled") {
+      DEBUG = setting.value;
+      updateDebug();
+      return;
+    }
     if (setting.key !== "wifi.enabled" &&
         setting.key !== "tethering.wifi.enabled") {
       return;
@@ -2596,10 +2620,13 @@ WifiWorker.prototype = {
 this.NSGetFactory = XPCOMUtils.generateNSGetFactory([WifiWorker]);
 
 let debug;
-if (DEBUG) {
+function updateDebug() {
-  debug = function (s) {
+  if (DEBUG) {
-    dump("-*- WifiWorker component: " + s + "\n");
+    debug = function (s) {
-  };
+      dump("-*- WifiWorker component: " + s + "\n");
-} else {
+    };
-  debug = function (s) {};
+  } else {
+    debug = function (s) {};
+  }
 }
+updateDebug();