use SAQueue and clear cache/queue tables on startup

isso/__init__.py

@@ -175,18 +175,19 @@ class Isso(object):
 
 def make_app(conf):
 
-    dbobj = db.Adapter(conf.get("general", "dbpath"))
 
     if uwsgi is not None:
         cacheobj = cache.uWSGICache(timeout=3600)
     else:
         cacheobj = cache.SACache(conf.get("general", "dbpath"), threshold=2048)
 
+    dbobj = db.Adapter(conf.get("general", "dbpath"))
+
     jobs = tasks.Jobs()
     jobs.register("db-purge", dbobj, conf.getint("moderation", "purge-after"))
     jobs.register("http-fetch", dbobj)
 
-    queueobj = queue.Queue(1024)
+    queueobj = queue.SAQueue(conf.get("general", "dbpath"), 1024)
     worker = queue.Worker(queueobj, jobs)
 
     isso = Isso(conf, cacheobj, dbobj)

isso/cache/sa.py

@@ -71,6 +71,7 @@ class SACache(Base):
             Column("time", Float))
 
         self.metadata.create_all(self.engine)
+        self.engine.execute(self.cache.delete())
 
     def _get(self, ns, key):
         return get(self.engine.connect(), self.cache, ns + b'-' + key)

isso/queue/sa.py

@@ -32,6 +32,7 @@ class SAQueue(Queue):
             Column("wait", Float))
 
         self.metadata.create_all(self.engine)
+        self.engine.execute(self.queue.delete())
 
     def put(self, item):
         with self.engine.begin() as con: