Azure Eventhub Rust

Azure Event Hubs library for Rust

Client library for Azure Event Hubs — send and receive events for streaming data ingestion.

Use this skill when:

• An app needs to send events to Azure Event Hubs from Rust

• You need to receive and process events from partitions

• You need batch sending for throughput optimization

• You need to control consumer start position

IMPORTANT: Only use the official azure_messaging_eventhubs 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_eventhubs azure_identity tokio futures

DeveloperToolsCredential::new(None)? already returns an Arc<DeveloperToolsCredential>, so you can pass or clone it directly into .open(). Add azure_core only when you need direct azure_core imports such as ErrorKind.

Environment Variables

EVENTHUBS_HOST=<namespace>.servicebus.windows.net # Required — fully qualified namespace
EVENTHUB_NAME=<eventhub-name>                     # Required — name of the Event Hub

Key Concepts

Authentication

Rust Azure SDK code must not use DefaultAzureCredential. The Rust identity crate does not provide that type.

use azure_identity::DeveloperToolsCredential;
use azure_messaging_eventhubs::ProducerClient;

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    // Local dev: DeveloperToolsCredential. Production: use ManagedIdentityCredential.
    let credential = DeveloperToolsCredential::new(None)?;

    let producer = ProducerClient::builder()
        .open(
            "<namespace>.servicebus.windows.net",
            "<eventhub-name>",
            credential.clone(),
        )
        .await?;
    Ok(())
}

Prefer the crate README/examples when checking builder signatures and receive-stream event wrapper shapes.

Core Workflow

Send Events

// Send a single event
producer.send_event(vec![1, 2, 3, 4], None).await?;

Send Batch

let batch = producer.create_batch(None).await?;
batch.try_add_event_data(vec![1, 2, 3, 4], None)?;

producer.send_batch(batch, None).await?;

Receive Events

use azure_identity::DeveloperToolsCredential;
use azure_messaging_eventhubs::ConsumerClient;

// Local dev: DeveloperToolsCredential. Production: use ManagedIdentityCredential.
let credential = DeveloperToolsCredential::new(None)?;
let consumer = ConsumerClient::builder()
    .open(
        "<namespace>.servicebus.windows.net",
        "<eventhub-name>".to_string(),
        credential.clone(),
    )
    .await?;

Receive from Partition

use futures::stream::StreamExt;
use azure_messaging_eventhubs::{
    ConsumerClient, OpenReceiverOptions, StartLocation, StartPosition,
};

let receiver = consumer
    .open_receiver_on_partition(
        "0".to_string(),
        Some(OpenReceiverOptions {
            start_position: Some(StartPosition {
                location: StartLocation::Earliest,
                ..Default::default()
            }),
            ..Default::default()
        }),
    )
    .await?;

let mut stream = receiver.stream_events();
while let Some(event_result) = stream.next().await {
    match event_result {
        // Body is on the inner event data, not the received wrapper: `event.event_data().body()`.
        Ok(event) => {
            let body = event.event_data().body().unwrap_or_default();
            println!("Received: {:?}", body);
        }
        Err(err) => eprintln!("Error: {:?}", err),
    }
}

RBAC Roles

For Entra ID auth, assign one of these roles:

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. Pass or clone credentials directly into .open(). DeveloperToolsCredential::new(None)? already returns an Arc, so you do not need to annotate the binding as Arc<dyn TokenCredential> unless you are naming that trait object type explicitly.

3. Match the builder signature. ProducerClient::builder().open(...) takes the hub name as &str, while ConsumerClient::builder().open(...) takes an owned String.

4. Use DeveloperToolsCredential for local dev, ManagedIdentityCredential for production — Rust does not provide a single DefaultAzureCredential type

5. Never hardcode credentials — use environment variables or managed identity

6. Use batching — create_batch + send_batch for throughput optimization

7. Handle errors per event — match on Ok/Err in the event stream

8. Extract event bodies via event.event_data().body(), not event.body() — ReceivedEventData wraps the underlying EventData.

9. Specify start position — use StartLocation::Earliest or StartLocation::Latest to control where consumption begins

10. Run cargo clippy -- -D warnings when the prompt, eval, or CI expects lint-clean output

Reference Links