Only save sites.json if fully loaded to avoid data loss

src/Site/SiteManager.py

@@ -19,12 +19,14 @@ class SiteManager(object):
         self.log = logging.getLogger("SiteManager")
         self.log.debug("SiteManager created.")
         self.sites = None
+        self.loaded = False
         gevent.spawn(self.saveTimer)
         atexit.register(self.save)
 
     # Load all sites from data/sites.json
     def load(self, cleanup=True):
         self.log.debug("Loading sites...")
+        self.loaded = False
         from Site import Site
         if self.sites is None:
             self.sites = {}
@@ -54,10 +56,15 @@ class SiteManager(object):
 
         if added:
             self.log.debug("SiteManager added %s sites" % added)
+        self.loaded = True
 
     def save(self):
         if not self.sites:
-            self.log.debug("Save: No sites found")
+            self.log.debug("Save skipped: No sites found")
+            return
+        if not self.loaded:
+            self.log.debug("Save skipped: Not loaded")
+            return
         s = time.time()
         data = {}
         # Generate data file
@@ -68,7 +75,10 @@ class SiteManager(object):
             data[address]["cache"]["bad_files"] = site.bad_files
             data[address]["cache"]["hashfield"] = site.content_manager.hashfield.tostring().encode("base64")
 
+        if data:
             helper.atomicWrite("%s/sites.json" % config.data_dir, json.dumps(data, indent=2, sort_keys=True))
+        else:
+            self.log.debug("Save error: No data")
         # Remove cache from site settings
         for address, site in self.list().iteritems():
             site.settings["cache"] = {}