nautilus_common/python/
msgbus.rs

1// -------------------------------------------------------------------------------------------------
2//  Copyright (C) 2015-2025 2Nautech Systems Pty Ltd. All rights reserved.
3//  https://nautechsystems.io
4//
5//  Licensed under the GNU Lesser General Public License Version 3.0 (the "License");
6//  You may not use this file except in compliance with the License.
7//  You may obtain a copy of the License at https://www.gnu.org/licenses/lgpl-3.0.en.html
8//
9//  Unless required by applicable law or agreed to in writing, software
10//  distributed under the License is distributed on an "AS IS" BASIS,
11//  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12//  See the License for the specific language governing permissions and
13//  limitations under the License.
14// -------------------------------------------------------------------------------------------------
15
16use std::rc::Rc;
17
18use pyo3::{PyObject, PyRefMut, pymethods};
19use ustr::Ustr;
20
21use super::handler::PythonMessageHandler;
22use crate::msgbus::{MessageBus, database::BusMessage, handler::ShareableMessageHandler};
23
24#[pymethods]
25impl BusMessage {
26    #[getter]
27    #[pyo3(name = "topic")]
28    fn py_close(&mut self) -> String {
29        self.topic.clone()
30    }
31
32    #[getter]
33    #[pyo3(name = "payload")]
34    fn py_payload(&mut self) -> &[u8] {
35        self.payload.as_ref()
36    }
37}
38
39#[pymethods]
40impl MessageBus {
41    /// Sends a message to a an endpoint.
42    #[pyo3(name = "send")]
43    pub fn send_py(&self, endpoint: &str, message: PyObject) {
44        if let Some(handler) = self.get_endpoint(endpoint) {
45            handler.0.handle(&message);
46        }
47    }
48
49    /// Publish a message to a topic.
50    #[pyo3(name = "publish")]
51    pub fn publish_py(&self, topic: &str, message: PyObject) {
52        let topic = Ustr::from(topic);
53        let matching_subs = self.matching_subscriptions(&topic);
54
55        for sub in matching_subs {
56            sub.handler.0.handle(&message);
57        }
58    }
59
60    /// Registers the given `handler` for the `endpoint` address.
61    #[pyo3(name = "register")]
62    pub fn register_py(&mut self, endpoint: &str, handler: PythonMessageHandler) {
63        // Updates value if key already exists
64        let handler = ShareableMessageHandler(Rc::new(handler));
65        self.register(endpoint, handler);
66    }
67
68    /// Subscribes the given `handler` to the `topic`.
69    ///
70    /// The priority for the subscription determines the ordering of
71    /// handlers receiving messages being processed, higher priority
72    /// handlers will receive messages before lower priority handlers.
73    ///
74    /// Safety: Priority should be between 0 and 255
75    ///
76    /// # Warnings
77    ///
78    /// Assigning priority handling is an advanced feature which *shouldn't
79    /// normally be needed by most users*. **Only assign a higher priority to the
80    /// subscription if you are certain of what you're doing**. If an inappropriate
81    /// priority is assigned then the handler may receive messages before core
82    /// system components have been able to process necessary calculations and
83    /// produce potential side effects for logically sound behavior.
84    #[pyo3(name = "subscribe")]
85    #[pyo3(signature = (topic, handler, priority=None))]
86    pub fn subscribe_py(
87        mut slf: PyRefMut<'_, Self>,
88        topic: &str,
89        handler: PythonMessageHandler,
90        priority: Option<u8>,
91    ) {
92        // Updates value if key already exists
93        let handler = ShareableMessageHandler(Rc::new(handler));
94        slf.subscribe(topic, handler, priority);
95    }
96
97    /// Returns whether there are subscribers for the given `pattern`.
98    #[must_use]
99    #[pyo3(name = "is_subscribed")]
100    pub fn is_subscribed_py(&self, topic: &str, handler: PythonMessageHandler) -> bool {
101        let handler = ShareableMessageHandler(Rc::new(handler));
102        self.is_subscribed(topic, handler)
103    }
104
105    /// Unsubscribes the given `handler` from the `topic`.
106    #[pyo3(name = "unsubscribe")]
107    pub fn unsubscribe_py(&mut self, topic: &str, handler: PythonMessageHandler) {
108        let handler = ShareableMessageHandler(Rc::new(handler));
109        self.unsubscribe(topic, handler);
110    }
111
112    /// Returns whether there are subscribers for the given `pattern`.
113    #[must_use]
114    #[pyo3(name = "is_registered")]
115    pub fn is_registered_py(&self, endpoint: &str) -> bool {
116        self.is_registered(endpoint)
117    }
118
119    /// Deregisters the given `handler` for the `endpoint` address.
120    #[pyo3(name = "deregister")]
121    pub fn deregister_py(&mut self, endpoint: &str) {
122        // Removes entry if it exists for endpoint
123        self.deregister(&Ustr::from(endpoint));
124    }
125}
nautilus_common/python/msgbus.rs

nautilus_common/python/
msgbus.rs
