The Tor Browser / file revision

 /* Any copyright is dedicated to the Public Domain.

    http://creativecommons.org/publicdomain/zero/1.0/ 

 */

 /* A testcase to make sure reading the failed profile lock count works.  */

 const Cc = Components.classes;

 const Ci = Components.interfaces;

 const Cu = Components.utils;

 const Cr = Components.results;

 Cu.import("resource://gre/modules/Services.jsm", this);

 const Telemetry = Cc["@mozilla.org/base/telemetry;1"].getService(Ci.nsITelemetry);

 const LOCK_FILE_NAME = "Telemetry.FailedProfileLocks.txt";

 const N_FAILED_LOCKS = 10;

 // Constants from prio.h for nsIFileOutputStream.init

 const PR_WRONLY = 0x2;

 const PR_CREATE_FILE = 0x8;

 const PR_TRUNCATE = 0x20;

 const RW_OWNER = 0600;

 function write_string_to_file(file, contents) {

   let ostream = Cc["@mozilla.org/network/safe-file-output-stream;1"]

                 .createInstance(Ci.nsIFileOutputStream);

   ostream.init(file, PR_WRONLY | PR_CREATE_FILE | PR_TRUNCATE,

 	       RW_OWNER, ostream.DEFER_OPEN);

   ostream.write(contents, contents.length);

   ostream.QueryInterface(Ci.nsISafeOutputStream).finish();

   ostream.close();

 }

 function construct_file() {

   let profileDirectory = Services.dirsvc.get("ProfD", Ci.nsIFile);

   let file = profileDirectory.clone();

   file.append(LOCK_FILE_NAME);

   return file;

 }

 function run_test() {

   do_get_profile();

   do_check_eq(Telemetry.failedProfileLockCount, 0);

   write_string_to_file(construct_file(), N_FAILED_LOCKS.toString());

   // Make sure that we're not eagerly reading the count now that the

   // file exists.

   do_check_eq(Telemetry.failedProfileLockCount, 0);

   do_test_pending();

   Telemetry.asyncFetchTelemetryData(actual_test);

 }

 function actual_test() {

   do_check_eq(Telemetry.failedProfileLockCount, N_FAILED_LOCKS);

   do_check_false(construct_file().exists());

   do_test_finished();

 }