Expose timeout capabilities and use them for tests

Change-Id: I5b6ee43e6a6b91859dacedb9791da74e247cd12b

tooz/coordination.py

@@ -50,6 +50,13 @@ class Characteristics(enum.Enum):
     """Coordinator components when used by multiple **hosts** work
        the same as if those components were only used by a single thread."""
 
+    NON_TIMEOUT_BASED = 'NON_TIMEOUT_BASED'
+    """The driver has the following property:
+
+    * Its operations are not based on the timeout of other clients, but on some
+    other more robust mechanisms.
+    """
+
     LINEARIZABLE = 'LINEARIZABLE'
     """The driver has the following properties:
 

tooz/drivers/file.py

@@ -205,6 +205,7 @@ class FileDriver(coordination._RunWatchersMixin,
     """
 
     CHARACTERISTICS = (
+        coordination.Characteristics.NON_TIMEOUT_BASED,
         coordination.Characteristics.DISTRIBUTED_ACROSS_THREADS,
         coordination.Characteristics.DISTRIBUTED_ACROSS_PROCESSES,
     )

tooz/drivers/ipc.py

@@ -150,6 +150,7 @@ class IPCDriver(coordination.CoordinationDriver):
     """
 
     CHARACTERISTICS = (
+        coordination.Characteristics.NON_TIMEOUT_BASED,
         coordination.Characteristics.DISTRIBUTED_ACROSS_THREADS,
         coordination.Characteristics.DISTRIBUTED_ACROSS_PROCESSES,
     )

tooz/drivers/mysql.py

@@ -105,6 +105,7 @@ class MySQLDriver(coordination.CoordinationDriver):
     """
 
     CHARACTERISTICS = (
+        coordination.Characteristics.NON_TIMEOUT_BASED,
         coordination.Characteristics.DISTRIBUTED_ACROSS_THREADS,
         coordination.Characteristics.DISTRIBUTED_ACROSS_PROCESSES,
         coordination.Characteristics.DISTRIBUTED_ACROSS_HOSTS,

tooz/drivers/pgsql.py

@@ -161,6 +161,7 @@ class PostgresDriver(coordination.CoordinationDriver):
     """
 
     CHARACTERISTICS = (
+        coordination.Characteristics.NON_TIMEOUT_BASED,
         coordination.Characteristics.DISTRIBUTED_ACROSS_THREADS,
         coordination.Characteristics.DISTRIBUTED_ACROSS_PROCESSES,
         coordination.Characteristics.DISTRIBUTED_ACROSS_HOSTS,

tooz/drivers/zake.py

@@ -33,6 +33,7 @@ class ZakeDriver(zookeeper.KazooDriver):
     """
 
     CHARACTERISTICS = (
+        coordination.Characteristics.NON_TIMEOUT_BASED,
         coordination.Characteristics.DISTRIBUTED_ACROSS_THREADS,
     )
     """

tooz/drivers/zookeeper.py

@@ -435,6 +435,7 @@ class KazooDriver(BaseZooKeeperDriver):
     """
 
     CHARACTERISTICS = (
+        coordination.Characteristics.NON_TIMEOUT_BASED,
         coordination.Characteristics.DISTRIBUTED_ACROSS_THREADS,
         coordination.Characteristics.DISTRIBUTED_ACROSS_PROCESSES,
         coordination.Characteristics.DISTRIBUTED_ACROSS_HOSTS,

tooz/tests/test_coordination.py

@@ -47,13 +47,11 @@ class TestAPI(testscenarios.TestWithScenarios,
                    'bad_url': 'kazoo://localhost:1'}),
         ('zake', {'url': 'zake://?timeout=5'}),
         ('memcached', {'url': os.getenv("TOOZ_TEST_MEMCACHED_URL"),
-                       'bad_url': 'memcached://localhost:1',
+                       'bad_url': 'memcached://localhost:1'}),
-                       'timeout_capable': True}),
         ('ipc', {'url': 'ipc://'}),
         ('file', {'url': 'file:///tmp'}),
         ('redis', {'url': os.getenv("TOOZ_TEST_REDIS_URL"),
-                   'bad_url': 'redis://localhost:1',
+                   'bad_url': 'redis://localhost:1'}),
-                   'timeout_capable': True}),
         ('postgresql', {'url': os.getenv("TOOZ_TEST_POSTGRESQL_URL"),
                         'bad_url': 'postgresql://localhost:1'}),
         ('mysql', {'url': os.getenv("TOOZ_TEST_MYSQL_URL"),
@@ -377,8 +375,9 @@ class TestAPI(testscenarios.TestWithScenarios,
         self.assertTrue(member_id_test2 not in members_ids)
 
     def test_timeout(self):
-        if not getattr(self, "timeout_capable", False):
+        if (tooz.coordination.Characteristics.NON_TIMEOUT_BASED
-            self.skipTest("This test only works with timeout capable drivers")
+           in self._coord.CHARACTERISTICS):
+            self.skipTest("This driver is not based on timeout")
         self._coord.stop()
         if "?" in self.url:
             sep = "&"