remove duplicate services and msgs

Author: Victor Lopez

ros1_bridge/__init__.py

@@ -245,7 +245,10 @@ def get_ros1_messages(rospack=None):
     pkgs = sorted(x for x in rosmsg.iterate_packages(rospack, rosmsg.MODE_MSG))
     for package_name, path in pkgs:
         for message_name in rosmsg._list_types(path, 'msg', rosmsg.MODE_MSG):
-            msgs.append(Message(package_name, message_name, path))
+            # iterate_packages might return ROS2 paths for already found ROS1 pkgs
+            msg = Message(package_name, message_name, path)
+            if msg not in msgs:
+              msgs.append(msg)
     return msgs
 
 
@@ -626,14 +629,15 @@ def determine_common_services(
                         'cpptype': ros2_type.rstrip('[]').replace('/', '::msg::')
                     }
                 })
-        if match:
-            services.append({
+        service_data = {
                 'ros1_name': pair[0].message_name,
                 'ros2_name': pair[1].message_name,
                 'ros1_package': pair[0].package_name,
                 'ros2_package': pair[1].package_name,
                 'fields': output
-            })
+            }
+        if match and service_data not in services:
+            services.append(service_data)
     return services