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

sh
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

bash
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

rust
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

rust
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

rust
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

rust
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

rust
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.