Added a timeout for HAR generation.

src/index.js

@@ -15,7 +15,10 @@ var spawn = require('cross-spawn-async');
  * @param {function(err, json)} callback callback (NOTE: if err != null err.code will be the exit code (e.g. 3 - wrong usage,
  * 4 - timeout, below zero - http://src.chromium.org/svn/trunk/src/net/base/net_error_list.h))
  */
-module.exports = function electronHAR(url, options, callback) {
+module.exports = function electronHAR(url, options, timeout, callback) {
+
+  if (timeout == undefined) { timeout = 0; }
+
   typeof options === 'function' && (callback = options, options = {});
 
   // Using temporary file to prevent messages like "Xlib:  extension ...",
@@ -54,6 +57,9 @@ module.exports = function electronHAR(url, options, callback) {
 
     // The callback for the spawned process.
     var processCallback = function (err, stdout, stderr) {
+
+      if (timeoutID != null) { clearTimeout(timeoutID); }
+
       if (err) {
         if (stderr) {
           err.message = stderr.trim();
@@ -77,11 +83,19 @@ module.exports = function electronHAR(url, options, callback) {
 
     // Initialise the electron-har process using spawn
     // as cross-exec-file (exec-file) results in stdout maxBuffer exceeded errors.
-    var command = spawn(__dirname + '/../bin/electron-har', args)
+    var command = spawn(__dirname + '/../bin/electron-har', args, {detached: true})
     var result = ''
     command.stdout.on('data', function(data){
       result += data.toString();
     })
     command.on('close', processCallback)
+
+    var timeoutID = null
+    if (timeout > 0) {
+      timeoutID = setTimeout(function () {
+          process.kill(-command.pid, 'SIGINT')
+      }, timeout * 1000);
+    }
+
   });
 };