1 files changed, 103 insertions, 0 deletions
diff --git a/toolkit/identity/LogUtils.jsm b/toolkit/identity/LogUtils.jsm
new file mode 100644
index 000000000..ec0f4c420
--- /dev/null
+++ b/toolkit/identity/LogUtils.jsm
@@ -0,0 +1,103 @@
+/* -*- js-indent-level: 2; indent-tabs-mode: nil -*- */
+/* vim: set ft=javascript ts=2 et sw=2 tw=80: */
+/* 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";
+
+this.EXPORTED_SYMBOLS = ["Logger"];
+const PREF_DEBUG = "toolkit.identity.debug";
+
+const Cu = Components.utils;
+const Ci = Components.interfaces;
+const Cc = Components.classes;
+const Cr = Components.results;
+
+Cu.import("resource://gre/modules/XPCOMUtils.jsm");
+Cu.import("resource://gre/modules/Services.jsm");
+
+function IdentityLogger() {
+  Services.prefs.addObserver(PREF_DEBUG, this, false);
+  this._debug = Services.prefs.getBoolPref(PREF_DEBUG);
+  return this;
+}
+
+IdentityLogger.prototype = {
+  QueryInterface: XPCOMUtils.generateQI([Ci.nsISupports, Ci.nsIObserver]),
+
+  observe: function observe(aSubject, aTopic, aData) {
+    switch (aTopic) {
+      case "nsPref:changed":
+        this._debug = Services.prefs.getBoolPref(PREF_DEBUG);
+        break;
+
+      case "quit-application-granted":
+        Services.prefs.removeObserver(PREF_DEBUG, this);
+        break;
+
+      default:
+        this.log("Logger observer", "Unknown topic:", aTopic);
+        break;
+    }
+  },
+
+  _generateLogMessage: function _generateLogMessage(aPrefix, args) {
+    // create a string representation of a list of arbitrary things
+    let strings = [];
+
+    // XXX bug 770418 - args look like flattened array, not list of strings
+
+    args.forEach(function(arg) {
+      if (typeof arg === 'string') {
+        strings.push(arg);
+      } else if (typeof arg === 'undefined') {
+        strings.push('undefined');
+      } else if (arg === null) {
+        strings.push('null');
+      } else {
+        try {
+          strings.push(JSON.stringify(arg, null, 2));
+        } catch (err) {
+          strings.push("<<something>>");
+        }
+      }
+    });
+    return 'Identity ' + aPrefix + ': ' + strings.join(' ');
+  },
+
+  /**
+   * log() - utility function to print a list of arbitrary things
+   *
+   * Enable with about:config pref toolkit.identity.debug
+   */
+  log: function log(aPrefix, ...args) {
+    if (!this._debug) {
+      return;
+    }
+    let output = this._generateLogMessage(aPrefix, args);
+    dump(output + "\n");
+
+    // Additionally, make the output visible in the Error Console
+    Services.console.logStringMessage(output);
+  },
+
+  /**
+   * reportError() - report an error through component utils as well as
+   * our log function
+   */
+  reportError: function reportError(aPrefix, ...aArgs) {
+    let prefix = aPrefix + ' ERROR';
+
+    // Report the error in the browser
+    let output = this._generateLogMessage(aPrefix, aArgs);
+    Cu.reportError(output);
+    dump("ERROR: " + output + "\n");
+    for (let frame = Components.stack.caller; frame; frame = frame.caller) {
+      dump(frame + "\n");
+    }
+  }
+
+};
+
+this.Logger = new IdentityLogger();