codesnips

async

typescript 
export type FetchState<T> =
  | { status: 'idle' }
  | { status: 'loading' }
  | { status: 'success'; data: T }
  | { status: 'error'; error: Error };

Discriminated-Union State Machine for a React Data-Fetching Hook

react hooks state-machine
by codesnips 3 tabs
python 
from celery import shared_task
from django.core.mail import send_mail
from django.contrib.auth import get_user_model

User = get_user_model()

Django celery task for async email sending

django python celery
by Priya Sharma 2 tabs
javascript 
class ApiError extends Error {
  constructor(statusCode, message, code) {
    super(message);
    this.name = 'ApiError';
    this.statusCode = statusCode;
    this.code = code || null;

Centralized Async Error Handling in Express With asyncHandler and Error Middleware

express nodejs error-handling
by codesnips 4 tabs
rust 
use tokio::sync::broadcast;

pub struct Shutdown {
    is_shutdown: bool,
    notify: broadcast::Receiver<()>,
}

Graceful Shutdown for a Tokio TCP Server on Ctrl-C with a Broadcast Signal

tokio async graceful-shutdown
by codesnips 3 tabs
rust 
use tokio::time::{sleep, Duration};

async fn fetch_data() -> String {
    sleep(Duration::from_millis(100)).await;
    "data".to_string()
}

async/await with tokio for concurrent I/O without blocking threads

rust async tokio
by Marcus Chen 1 tab
python 
import asyncio
from typing import Awaitable, Callable, Dict, TypeVar

T = TypeVar("T")

Coalesce Duplicate In-Flight Requests with an Asyncio Single-Flight Cache

asyncio concurrency caching
by codesnips 3 tabs