Use rclpy.init context manager where we can. (#547)

This allows us to cleanup, while using a lot less code
to try and track it.

Signed-off-by: Chris Lalancette <clalancette@gmail.com>

test_cli/test/initial_params.py

@@ -15,19 +15,21 @@
 import sys
 
 import rclpy
+from rclpy.executors import ExternalShutdownException
 
 
 def main(argv=sys.argv):
-    rclpy.init(args=argv)
+    try:
+        with rclpy.init(args=argv):
+            node = rclpy.create_node(
+                'initial_params_node',
+                namespace='/',
+                allow_undeclared_parameters=True,
+                automatically_declare_parameters_from_overrides=True)
+            rclpy.spin(node)
+    except (KeyboardInterrupt, ExternalShutdownException):
+        pass
 
-    node = rclpy.create_node(
-        'initial_params_node',
-        namespace='/',
-        allow_undeclared_parameters=True,
-        automatically_declare_parameters_from_overrides=True)
-    rclpy.spin(node)
-
-    rclpy.shutdown()
     return 0
 
 

test_cli/test/test_params_yaml.py

@@ -31,19 +31,15 @@
 @pytest.fixture(scope='module', params=CLIENT_LIBRARY_EXECUTABLES)
 def node_fixture(request):
     """Create a fixture with a node and helper executable."""
-    rclpy.init()
-    node = rclpy.create_node(
-        'tests_yaml',
-        allow_undeclared_parameters=True,
-        automatically_declare_parameters_from_overrides=True)
-    try:
+    with rclpy.init():
+        node = rclpy.create_node(
+            'tests_yaml',
+            allow_undeclared_parameters=True,
+            automatically_declare_parameters_from_overrides=True)
         yield {
             'node': node,
             'executable': request.param,
         }
-    finally:
-        node.destroy_node()
-        rclpy.shutdown()
 
 
 def get_params(node, node_name, param_names, wfs_timeout=5.0):

test_cli_remapping/test/name_maker.py

@@ -13,6 +13,7 @@
 # limitations under the License.
 
 import rclpy
+from rclpy.executors import ExternalShutdownException
 import rclpy.node
 from test_msgs.msg import Empty as EmptyMsg
 from test_msgs.srv import Empty as EmptySrv
@@ -35,15 +36,9 @@ def __init__(self):
 
 
 if __name__ == '__main__':
-    rclpy.init()
-
-    node = NameMaker()
-
     try:
-        rclpy.spin(node)
-    except KeyboardInterrupt:
+        with rclpy.init():
+            node = NameMaker()
+            rclpy.spin(node)
+    except (KeyboardInterrupt, ExternalShutdownException):
         print('Shutting down name_maker.py')
-    else:
-        rclpy.shutdown()
-    finally:
-        node.destroy_node()

test_communication/test/action_server_py.py

@@ -16,6 +16,8 @@
 import sys
 import time
 
+import rclpy
+from rclpy.action import ActionServer
 from rclpy.executors import ExternalShutdownException
 
 from test_msgs.action import Fibonacci
@@ -32,8 +34,6 @@ def execute_goal(self, goal_handle):
 
 
 def receive_goals(node, action_type, expected_goals):
-    from rclpy.action import ActionServer
-
     def execute_callback(goal_handle):
         for expected_goal in expected_goals:
             if expected_goal.is_goal_expected(goal_handle.request):
@@ -48,8 +48,6 @@ def execute_callback(goal_handle):
 
 
 def generate_expected_fibonacci_goals():
-    import rclpy
-
     expected_goals = []
 
     def is_goal_expected(goal):
@@ -101,8 +99,6 @@ def execute_goal(goal_handle):
 
 
 def generate_expected_nested_message_goals():
-    import rclpy
-
     expected_goals = []
 
     def is_goal_expected(goal):
@@ -151,39 +147,27 @@ def execute_goal(goal_handle):
 
 
 if __name__ == '__main__':
-    import rclpy
-
-    parser = argparse.ArgumentParser(formatter_class=argparse.ArgumentDefaultsHelpFormatter)
-    parser.add_argument('action_type', help='type of the ROS action')
-    parser.add_argument('namespace', help='namespace of the ROS node')
-    args = parser.parse_args()
-
-    rclpy.init(args=[])
-    node = rclpy.create_node('action_server', namespace=args.namespace)
-
-    if 'Fibonacci' == args.action_type:
-        action_server = receive_goals(node, Fibonacci, generate_expected_fibonacci_goals())
-    elif 'NestedMessage' == args.action_type:
-        action_server = receive_goals(
-            node,
-            NestedMessage,
-            generate_expected_nested_message_goals(),
-        )
-    else:
-        print('Unknown action type {!r}'.format(args.action_type), file=sys.stderr)
-        node.destroy_node()
-        rclpy.shutdown()
-        sys.exit(1)
-
     try:
-        rclpy.spin(node)
-    except KeyboardInterrupt:
+        parser = argparse.ArgumentParser(formatter_class=argparse.ArgumentDefaultsHelpFormatter)
+        parser.add_argument('action_type', help='type of the ROS action')
+        parser.add_argument('namespace', help='namespace of the ROS node')
+        args = parser.parse_args()
+
+        with rclpy.init(args=[]):
+            node = rclpy.create_node('action_server', namespace=args.namespace)
+
+            if 'Fibonacci' == args.action_type:
+                action_server = receive_goals(node, Fibonacci, generate_expected_fibonacci_goals())
+            elif 'NestedMessage' == args.action_type:
+                action_server = receive_goals(
+                    node,
+                    NestedMessage,
+                    generate_expected_nested_message_goals(),
+                )
+            else:
+                print('Unknown action type {!r}'.format(args.action_type), file=sys.stderr)
+                sys.exit(1)
+
+            rclpy.spin(node)
+    except (KeyboardInterrupt, ExternalShutdownException):
         print('Action server stopped cleanly')
-    except ExternalShutdownException:
-        sys.exit(1)
-    except BaseException:
-        print('Exception in action server:', file=sys.stderr)
-        raise
-    finally:
-        rclpy.try_shutdown()
-        node.destroy_node()

test_communication/test/replier_py.py

@@ -15,7 +15,11 @@
 import argparse
 import functools
 import importlib
-import sys
+
+import rclpy
+from rclpy.executors import ExternalShutdownException
+
+from test_msgs.service_fixtures import get_test_srv
 
 
 def replier_callback(request, response, srv_fixtures):
@@ -27,33 +31,27 @@ def replier_callback(request, response, srv_fixtures):
 
 
 def replier(service_name, number_of_cycles, namespace):
-    from test_msgs.service_fixtures import get_test_srv
-    import rclpy
-
     service_pkg = 'test_msgs'
     module = importlib.import_module(service_pkg + '.srv')
     srv_mod = getattr(module, service_name)
 
-    rclpy.init(args=[])
-
-    node = rclpy.create_node('replier', namespace=namespace)
+    with rclpy.init(args=[]):
+        node = rclpy.create_node('replier', namespace=namespace)
 
-    srv_fixtures = get_test_srv(service_name)
+        srv_fixtures = get_test_srv(service_name)
 
-    chatter_callback = functools.partial(
-        replier_callback, srv_fixtures=srv_fixtures)
+        chatter_callback = functools.partial(
+            replier_callback, srv_fixtures=srv_fixtures)
 
-    node.create_service(
-        srv_mod, 'test/service/' + service_name, chatter_callback)
+        node.create_service(
+            srv_mod, 'test/service/' + service_name, chatter_callback)
 
-    spin_count = 1
-    print('replier: beginning loop')
-    while rclpy.ok() and spin_count < number_of_cycles:
-        rclpy.spin_once(node, timeout_sec=2)
-        spin_count += 1
-        print('spin_count: ' + str(spin_count))
-    node.destroy_node()
-    rclpy.shutdown()
+        spin_count = 1
+        print('replier: beginning loop')
+        while rclpy.ok() and spin_count < number_of_cycles:
+            rclpy.spin_once(node, timeout_sec=2)
+            spin_count += 1
+            print('spin_count: ' + str(spin_count))
 
 
 if __name__ == '__main__':
@@ -69,8 +67,5 @@ def replier(service_name, number_of_cycles, namespace):
             number_of_cycles=args.number_of_cycles,
             namespace=args.namespace
         )
-    except KeyboardInterrupt:
+    except (KeyboardInterrupt, ExternalShutdownException):
         print('server stopped cleanly')
-    except BaseException:
-        print('exception in server:', file=sys.stderr)
-        raise

test_communication/test/requester_py.py

@@ -14,13 +14,14 @@
 
 import argparse
 import importlib
-import sys
 
+import rclpy
+from rclpy.executors import ExternalShutdownException
+
+from test_msgs.service_fixtures import get_test_srv
 
-def requester(service_name, namespace):
-    import rclpy
-    from test_msgs.service_fixtures import get_test_srv
 
+def requester(service_name, namespace):
     # Import the service
     service_pkg = 'test_msgs'
     module = importlib.import_module(service_pkg + '.srv')
@@ -29,31 +30,25 @@ def requester(service_name, namespace):
     srv_fixtures = get_test_srv(service_name)
     service_name = 'test/service/' + service_name
 
-    rclpy.init(args=[])
-    try:
+    with rclpy.init(args=[]):
         node = rclpy.create_node('requester', namespace=namespace)
-        try:
-            # wait for the service to be available
-            client = node.create_client(srv_mod, service_name)
-            tries = 15
-            while rclpy.ok() and not client.wait_for_service(timeout_sec=1.0) and tries > 0:
-                print('service not available, waiting again...')
-                tries -= 1
-            assert tries > 0, 'service still not available, aborting test'
-
-            print('requester: beginning request')
-            # Make one call to that service
-            for req, resp in srv_fixtures:
-                future = client.call_async(req)
-                rclpy.spin_until_future_complete(node, future)
-                assert repr(future.result()) == repr(resp), \
-                    'unexpected response %r\n\nwas expecting %r' % (future.result(), resp)
-                print('received reply #%d of %d' % (
-                    srv_fixtures.index([req, resp]) + 1, len(srv_fixtures)))
-        finally:
-            node.destroy_node()
-    finally:
-        rclpy.shutdown()
+        # wait for the service to be available
+        client = node.create_client(srv_mod, service_name)
+        tries = 15
+        while rclpy.ok() and not client.wait_for_service(timeout_sec=1.0) and tries > 0:
+            print('service not available, waiting again...')
+            tries -= 1
+        assert tries > 0, 'service still not available, aborting test'
+
+        print('requester: beginning request')
+        # Make one call to that service
+        for req, resp in srv_fixtures:
+            future = client.call_async(req)
+            rclpy.spin_until_future_complete(node, future)
+            assert repr(future.result()) == repr(resp), \
+                'unexpected response %r\n\nwas expecting %r' % (future.result(), resp)
+            print('received reply #%d of %d' % (
+                srv_fixtures.index([req, resp]) + 1, len(srv_fixtures)))
 
 
 if __name__ == '__main__':
@@ -63,8 +58,5 @@ def requester(service_name, namespace):
     args = parser.parse_args()
     try:
         requester(service_name=args.service_name, namespace=args.namespace)
-    except KeyboardInterrupt:
+    except (KeyboardInterrupt, ExternalShutdownException):
         print('requester stopped cleanly')
-    except BaseException:
-        print('exception in requester:', file=sys.stderr)
-        raise