dynamo_runtime/component/
namespace.rs

1// SPDX-FileCopyrightText: Copyright (c) 2024-2026 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
2// SPDX-License-Identifier: Apache-2.0
3
4use anyhow::Context;
5use anyhow::Result;
6use async_trait::async_trait;
7use futures::stream::StreamExt;
8use futures::{Stream, TryStreamExt};
9use serde::Deserialize;
10use serde::Serialize;
11
12use crate::component::Namespace;
13use crate::metrics::{MetricsHierarchy, MetricsRegistry};
14use crate::traits::DistributedRuntimeProvider;
15use crate::traits::events::{EventPublisher, EventSubscriber};
16
17#[async_trait]
18impl EventPublisher for Namespace {
19    fn subject(&self) -> String {
20        format!("namespace.{}", self.name)
21    }
22
23    async fn publish(
24        &self,
25        event_name: impl AsRef<str> + Send + Sync,
26        event: &(impl Serialize + Send + Sync),
27    ) -> Result<()> {
28        let bytes = serde_json::to_vec(event)?;
29        self.publish_bytes(event_name, bytes).await
30    }
31
32    async fn publish_bytes(
33        &self,
34        event_name: impl AsRef<str> + Send + Sync,
35        bytes: Vec<u8>,
36    ) -> Result<()> {
37        let subject = format!("{}.{}", self.subject(), event_name.as_ref());
38        self.drt()
39            .kv_router_nats_publish(subject, bytes.into())
40            .await?;
41        Ok(())
42    }
43}
44
45#[async_trait]
46impl EventSubscriber for Namespace {
47    async fn subscribe(
48        &self,
49        event_name: impl AsRef<str> + Send + Sync,
50    ) -> Result<async_nats::Subscriber> {
51        let subject = format!("{}.{}", self.subject(), event_name.as_ref());
52        Ok(self.drt().kv_router_nats_subscribe(subject).await?)
53    }
54
55    async fn subscribe_with_type<T: for<'de> Deserialize<'de> + Send + 'static>(
56        &self,
57        event_name: impl AsRef<str> + Send + Sync,
58    ) -> Result<impl Stream<Item = Result<T>> + Send> {
59        let subscriber = self.subscribe(event_name).await?;
60
61        // Transform the subscriber into a stream of deserialized events
62        let stream = subscriber.map(move |msg| {
63            serde_json::from_slice::<T>(&msg.payload)
64                .with_context(|| format!("Failed to deserialize event payload: {:?}", msg.payload))
65        });
66
67        Ok(stream)
68    }
69}
70
71impl MetricsHierarchy for Namespace {
72    fn basename(&self) -> String {
73        self.name.clone()
74    }
75
76    fn parent_hierarchies(&self) -> Vec<&dyn MetricsHierarchy> {
77        let mut parents = vec![];
78
79        // Walk up the namespace parent chain (grandparents to immediate parent)
80        let parent_chain: Vec<&Namespace> =
81            std::iter::successors(self.parent.as_deref(), |ns| ns.parent.as_deref()).collect();
82
83        // Add DRT first (root)
84        parents.push(&*self.runtime as &dyn MetricsHierarchy);
85
86        // Then add parent namespaces in reverse order (root -> leaf)
87        for parent_ns in parent_chain.iter().rev() {
88            parents.push(*parent_ns as &dyn MetricsHierarchy);
89        }
90
91        parents
92    }
93
94    fn get_metrics_registry(&self) -> &MetricsRegistry {
95        &self.metrics_registry
96    }
97}
98
99#[cfg(feature = "integration")]
100#[cfg(test)]
101mod tests {
102    use crate::{DistributedRuntime, Runtime};
103
104    use super::*;
105
106    // todo - make a distributed runtime fixture
107    // todo - two options - fully mocked or integration test
108    #[tokio::test]
109    async fn test_publish() {
110        let rt = Runtime::from_current().unwrap();
111        let dtr = DistributedRuntime::from_settings(rt.clone()).await.unwrap();
112        let ns = dtr.namespace("test_namespace_publish".to_string()).unwrap();
113        ns.publish("test_event", &"test".to_string()).await.unwrap();
114        rt.shutdown();
115    }
116
117    #[tokio::test]
118    async fn test_subscribe() {
119        let rt = Runtime::from_current().unwrap();
120        let dtr = DistributedRuntime::from_settings(rt.clone()).await.unwrap();
121        let ns = dtr
122            .namespace("test_namespace_subscribe".to_string())
123            .unwrap();
124
125        // Create a subscriber
126        let mut subscriber = ns.subscribe("test_event").await.unwrap();
127
128        // Publish a message
129        ns.publish("test_event", &"test_message".to_string())
130            .await
131            .unwrap();
132
133        // Receive the message
134        if let Some(msg) = subscriber.next().await {
135            let received = String::from_utf8(msg.payload.to_vec()).unwrap();
136            assert_eq!(received, "\"test_message\"");
137        }
138
139        rt.shutdown();
140    }
141}
dynamo_runtime/component/namespace.rs

dynamo_runtime/component/
namespace.rs
