Improve tests, fix iter update

Author: DifferentialOrange

tarantool/connection_pool.py

@@ -103,9 +103,13 @@ def update(self, new_pool):
 
         if len(RW_pool) > 0:
             self.RW_iter = cycle(RW_pool)
+        else:
+            self.RW_iter = None
 
         if len(RO_pool) > 0:
             self.RO_iter = cycle(RO_pool)
+        else:
+            self.RO_iter = None
 
     def getnext(self, mode):
         if mode == Mode.RW:

test/suites/test_pool.py

@@ -92,6 +92,9 @@ def test_01_roundrobin(self):
         self.set_cluster_ro([False, False, True, False, True])
         RW_ports = set([str(self.addrs[0]['port']), str(self.addrs[1]['port']), str(self.addrs[3]['port'])])
         RO_ports = set([str(self.addrs[2]['port']), str(self.addrs[4]['port'])])
+        all_ports = set()
+        for addr in self.addrs:
+            all_ports.add(str(addr['port']))
 
         conn = tarantool.ConnectionPool(addrs=self.addrs, user='test', password='test')
 
@@ -119,37 +122,27 @@ def test_01_roundrobin(self):
 
         self.assertSetEqual(PREFER_RO_ports_result, RO_ports)
 
-    def test_02_roundrobin_all_ro(self):
+        # Expect PREFER_RW iterate through all instances if there are no RW.
         self.set_cluster_ro([True, True, True, True, True])
-        all_ports = set()
-        for addr in self.addrs:
-            all_ports.add(str(addr['port']))
-
-        conn = tarantool.ConnectionPool(addrs=self.addrs, user='test', password='test')
+        conn.update_ro_info()
 
-        # Expect PREFER_RW iterate through all instances if there are no RW.
-        PREFER_RW_ports_result = set()
+        PREFER_RW_ports_result_all_ro = set()
         for i in range(len(self.servers)):
             resp = conn.eval('return box.cfg.listen', mode=tarantool.Mode.PREFER_RW)
-            PREFER_RW_ports_result.add(resp.data[0])
+            PREFER_RW_ports_result_all_ro.add(resp.data[0])
 
-        self.assertSetEqual(PREFER_RW_ports_result, all_ports)
+        self.assertSetEqual(PREFER_RW_ports_result_all_ro, all_ports)
 
-    def test_03_roundrobin_all_rw(self):
+        # Expect PREFER_RO iterate through all instances if there are no RO.
         self.set_cluster_ro([False, False, False, False, False])
-        all_ports = set()
-        for addr in self.addrs:
-            all_ports.add(str(addr['port']))
+        conn.update_ro_info()
 
-        conn = tarantool.ConnectionPool(addrs=self.addrs, user='test', password='test')
-
-        # Expect PREFER_RO iterate through all instances if there are no RO.
-        PREFER_RO_ports_result = set()
+        PREFER_RO_ports_result_all_rw = set()
         for i in range(len(self.servers)):
             resp = conn.eval('return box.cfg.listen', mode=tarantool.Mode.PREFER_RO)
-            PREFER_RO_ports_result.add(resp.data[0])
+            PREFER_RO_ports_result_all_rw.add(resp.data[0])
 
-        self.assertSetEqual(PREFER_RO_ports_result, all_ports)
+        self.assertSetEqual(PREFER_RO_ports_result_all_rw, all_ports)
 
     def tearDown(self):
         for srv in self.servers: