Module data 

Utilities for task runtime data extension.

The Data type and related middleware are important for sharing state across tasks or layers within the same task.

Overview

• Data<T>: Wraps a value of type T for sharing across tasks.
• AddExtension<S, T>: Middleware for injecting shared data into a task’s context.
• MissingDataError: Error type for missing or unavailable data in a task context.

Usage

Use Data to share application state (such as database connections, configuration, etc.) across tasks and layers. Apply this middleware using WorkerBuilder::data.

Example

struct State { /* ... */ }

async fn email_service(email: String, state: Data<Arc<State>>) {
    // Use shared state here
}

let state = Arc::new(State { /* ... */ });
let worker = WorkerBuilder::new("tasty-avocado")
    .backend(MemoryStorage::new())
    .data(state)
    .build(email_service);

Features

• Type-safe access to shared data.
• Integrated as middleware.
• Error handling for missing data.

See Also

• FromRequest trait for extracting data from task contexts.
• Task type representing a unit of work.

Structs

AddExtension

Middleware for adding some shareable value to [request data].

Data

Extension data for tasks. This is commonly used to share state across tasks. or across layers within the same tasks

Enums

MissingDataError

Error type for missing data in a task’s context.