Azure Service Bus library for Rust

When to Use

Use this skill when you need azure Service Bus library for Rust. Send and receive messages using queues, topics, and subscriptions. Triggers: "service bus rust", "ServiceBusClient rust", "send message servicebus rust", "receive message servicebus rust", "queue rust messaging", "topic subscription rust".

Client library for Azure Service Bus — enterprise message broker with queues and publish-subscribe topics.

⚠️ WARNING: This crate is in early development and SHOULD NOT be used in production. APIs may change without notice.

Use this skill when:

• An app needs to send or receive messages via Azure Service Bus from Rust
• You need queue-based messaging with competing consumers
• You need publish-subscribe messaging with topics and subscriptions
• You need reliable message delivery with completion semantics

IMPORTANT: Only use the official azure_messaging_servicebus crate published by the azure-sdk crates.io user. Do NOT use unofficial or community crates. Official crates use underscores in names and none have version 0.21.0.

Installation

cargo add azure_messaging_servicebus azure_identity tokio

If your code uses azure_core types directly, add azure_core to Cargo.toml. If you only use azure_messaging_servicebus re-exports, direct azure_core dependency is optional.

Environment Variables

SERVICEBUS_NAMESPACE=<namespace>.servicebus.windows.net # Required — fully qualified namespace

Key Concepts

Concept	Description
Namespace	Container for all messaging components
Queue	Point-to-point messaging with competing consumers
Topic	Publish-subscribe messaging — one sender, many subscribers
Subscription	Receives messages from a topic
Message	Package of data and metadata, with completion/abandon semantics

Authentication

use azure_identity::DeveloperToolsCredential;
use azure_messaging_servicebus::ServiceBusClient;

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    // Local dev: DeveloperToolsCredential. Production: use ManagedIdentityCredential.
    let credential = DeveloperToolsCredential::new(None)?;
    let client = ServiceBusClient::builder()
        .open("your_namespace.servicebus.windows.net", credential.clone())
        .await?;
    Ok(())
}

Core Workflow

Send a Message to a Queue

use azure_identity::DeveloperToolsCredential;
use azure_messaging_servicebus::{ServiceBusClient, Message};

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let credential = DeveloperToolsCredential::new(None)?;
    let client = ServiceBusClient::builder()
        .open("your_namespace.servicebus.windows.net", credential.clone())
        .await?;
    let sender = client.create_sender("my_queue", None).await?;

    let message = Message::from("Hello, Service Bus!");
    sender.send_message(message, None).await?;
    Ok(())
}

Receive Messages from a Queue

use azure_identity::DeveloperToolsCredential;
use azure_messaging_servicebus::ServiceBusClient;

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let credential = DeveloperToolsCredential::new(None)?;
    let client = ServiceBusClient::builder()
        .open("your_namespace.servicebus.windows.net", credential.clone())
        .await?;
    let receiver = client.create_receiver("my_queue", None).await?;

    let messages = receiver.receive_messages(5, None).await?;
    for message in messages {
        println!("Received: {}", message.body_as_string()?);
        receiver.complete_message(&message, None).await?;
    }
    Ok(())
}

Send a Message to a Topic

let sender = client.create_sender("my_topic", None).await?;
let message = Message::from("Hello, Topic subscribers!");
sender.send_message(message, None).await?;

Receive Messages from a Subscription

let receiver = client
    .create_receiver_for_subscription("my_topic", "my_subscription", None)
    .await?;

let messages = receiver.receive_messages(5, None).await?;
for message in messages {
    println!("Received: {}", message.body_as_string()?);
    receiver.complete_message(&message, None).await?;
}

Message Settlement

Action	Purpose
complete	Remove message from queue — processing succeeded
abandon	Release lock — message becomes available for retry

Always complete messages after successful processing to prevent redelivery.

RBAC Roles

For Entra ID auth, assign one of these roles:

Role	Access
Azure Service Bus Data Sender	Send messages
Azure Service Bus Data Receiver	Receive messages
Azure Service Bus Data Owner	Full access

Best Practices

1. Use cargo add to manage dependencies, never edit Cargo.toml directly. Add and remove Rust SDK dependencies with cargo commands instead of manual manifest edits.
2. Add azure_core only when importing azure_core types directly. If your code imports azure_core::http::Url, azure_core::http::RequestContent, or azure_core::error::ErrorKind, include azure_core; otherwise a direct dependency is optional.
3. Use DeveloperToolsCredential for local dev, ManagedIdentityCredential for production — Rust does not provide a single DefaultAzureCredential type
4. Never hardcode credentials — use environment variables or managed identity
5. Assign RBAC roles — ensure the identity has appropriate Service Bus data roles
6. Always complete messages — call complete_message after processing to remove from queue
7. Use topics for fan-out — when multiple consumers need the same messages, use topics with subscriptions
8. This crate is pre-production — APIs may change; pin your dependency version with cargo commands in your dependency workflow

Reference Links

Resource	Link
API Reference	https://docs.rs/azure_messaging_servicebus/latest/azure_messaging_servicebus
crates.io	https://crates.io/crates/azure_messaging_servicebus
Source Code	https://github.com/Azure/azure-sdk-for-rust/tree/main/sdk/servicebus/azure_messaging_servicebus

Limitations

• Use this skill only when the task clearly matches its upstream source and local project context.
• Verify commands, generated code, dependencies, credentials, and external service behavior before applying changes.
• Do not treat examples as a substitute for environment-specific tests, security review, or user approval for destructive or costly actions.