Add a close() method to the ZEOStorage that closes connection to client.

XXX If select() raises an exception inside asyncore, close the connection.

src/ZEO/StorageServer.py

@@ -118,11 +118,16 @@ class ZEOStorage:
     def __init__(self, server):
         self.server = server
         self.client = None
+        self._conn = None # the connection associated with client
         self.__storage = None
         self.__storage_id = "uninitialized"
         self._transaction = None
 
+    def close(self):
+        self._conn.close()
+
     def notifyConnected(self, conn):
+        self._conn = conn
         self.client = ClientStub.ClientStorage(conn)
 
     def __repr__(self):

src/ZEO/zrpc/connection.py

@@ -325,7 +325,12 @@ class Connection(smac.SizedMessageAsyncConnection):
             # Do loop only if lock is already acquired.  XXX But can't
             # we already guarantee that the lock is already acquired?
             while not self.__reply_lock.acquire(0):
+                try:
                     asyncore.poll(10.0, self._map)
+                except select.error, err:
+                    log("Closing.  asyncore.poll() raised %s." % err,
+                        level=zLOG.BLATHER)
+                    self.close()
                 if self.closed:
                     raise DisconnectedError()
         self.__reply_lock.release()