return from WebPage to indicate whether a link was actually crawlable and only actually crawl it if it was

crawler.py

@@ -6,6 +6,7 @@ Need a docstring.
 import argparse
 import jinja2
 import os
+import asyncio
 from datetime import datetime
 from utils.helpers import (UrlPool, WebPage, RobotsTxt, sanitise_url)
 
@@ -57,16 +58,18 @@ def process_pool(base_url=None, uncrawled_urls=None, crawled_urls=None, robots=N
         # create a WebPage object for the URL
         current_page = WebPage(url=new_url, base_url=base_url, robots=robots)
         try:
-            current_page.run()
-            _urls = current_page.list_urls()
-            crawled_urls.add_to_pool(new_url)
+            succeeded = current_page.run()
         except Exception as e:
             print(e)
 
-        for url in _urls:
-            sanitised_url = sanitise_url(url=url)
-            if sanitised_url not in crawled_urls.pool:
-                uncrawled_urls.add_to_pool(url)
+        if succeeded:
+            _urls = current_page.list_urls()
+            crawled_urls.add_to_pool(new_url)
+
+            for url in _urls:
+                sanitised_url = sanitise_url(url=url)
+                if sanitised_url not in crawled_urls.pool:
+                    uncrawled_urls.add_to_pool(url)
 
         print('{0} URLs crawled, {1} remaining'.format(len(crawled_urls.pool),
                 len(uncrawled_urls.pool)))