handle errors from extract-outlinks.js, which happens on polyvore.com…

… because it changes the definition of Set 😭

brozzler/browser.py

@@ -1,7 +1,7 @@
 '''
 brozzler/browser.py - manages the browsers for brozzler
 
-Copyright (C) 2014-2016 Internet Archive
+Copyright (C) 2014-2017 Internet Archive
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
@@ -485,9 +485,17 @@ def extract_outlinks(self, timeout=60):
                 lambda: self.websock_thread.received_result(msg_id),
                 timeout=timeout)
         message = self.websock_thread.pop_result(msg_id)
-        if message['result']['result']['value']:
-            return frozenset(message['result']['result']['value'].split('\n'))
+        if ('result' in message and 'result' in message['result']
+                and 'value' in message['result']['result']):
+            if message['result']['result']['value']:
+                return frozenset(
+                        message['result']['result']['value'].split('\n'))
+            else:
+                # no links found
+                return frozenset()
         else:
+            self.logger.error(
+                    'problem extracting outlinks, result message: %s', message)
             return frozenset()
 
     def screenshot(self, timeout=30):

brozzler/js-templates/extract-outlinks.js

@@ -1,3 +1,5 @@
+// we have problems if the page has changed the definition of Set or Array
+// http://www.polyvore.com/ does this for example
 var __brzl_framesDone = new Set();
 var __brzl_compileOutlinks = function(frame) {
     __brzl_framesDone.add(frame);

setup.py

@@ -32,7 +32,7 @@ def find_package_data(package):
 
 setuptools.setup(
         name='brozzler',
-        version='1.1b9.dev191',
+        version='1.1b9.dev192',
         description='Distributed web crawling with browsers',
         url='https://github.com/internetarchive/brozzler',
         author='Noah Levitt',