Azure Functions for Rust

The Azure Functions for Rust crate supports creating Azure Functions with Rust.

The following Azure Functions trigger bindings are supported:

• Blob trigger
• Cosmos DB trigger
• Durable Activity trigger
• Durable Orchestration trigger
• Event Grid trigger
• Event Hub trigger
• Generic trigger
• HTTP trigger
• Service Bus trigger
• Queue trigger
• Timer trigger

The following Azure Functions input bindings are supported:

• Blob input
• Cosmos DB input
• Durable orchestration client input
• Generic input
• SignalR connection info input
• Table input

The following Azure Functions output bindings are supported:

• Blob output
• Cosmos DB output
• Event Hub output
• Generic output
• HTTP output
• Queue output
• SendGrid email message output
• Service Bus output
• SignalR group action output
• SignalR message output
• Table output
• Twilio SMS message output

Eventually more bindings will be implemented, including custom binding data.

Example

Start by installing the Azure Functions for Rust SDK:

$ cargo install azure-functions-sdk

Create a new Azure Functions for Rust application:

$ cargo func new-app hello && cd hello

Create a HTTP-triggered function:

$ cargo func new http -n hello

This generates src/functions/hello.rs with the following contents:

use azure_functions::{
    bindings::{HttpRequest, HttpResponse},
    func,
};

#[func]
pub fn hello(req: HttpRequest) -> HttpResponse {
    "Hello from Rust!".into()
}

Azure Functions are implemented by applying a #[func] attribute to a Rust function.

Run the application with cargo func run:

$ cargo func run

The above Azure Function can be invoked with http://localhost:8080/api/hello.

The expected response would be Hello from Rust!.