codesnips

reliability

go 
package mailer

import (
	"crypto/sha256"
	"encoding/hex"
	"strings"

Idempotent Email Sending with a Redis Fingerprint Set in Go

redis idempotency email
by codesnips 3 tabs
go 
package cleanup

import "errors"

func CloseAll(closers ...func() error) error {
  var errs []error

errors.Join for cleanup (surface multiple close failures)

go errors reliability
by Leah Thompson 1 tab
go 
package limit

import (
  "context"

  "golang.org/x/sync/semaphore"

Concurrency limiting with a context-aware semaphore

go concurrency context
by Leah Thompson 1 tab
go 
package apiclient

import (
	"context"
	"fmt"
	"io"

Sharing a golang.org/x/time/rate Limiter Across Goroutines for Outbound API Calls

go rate-limiting concurrency
by codesnips 3 tabs
javascript 
const { pool } = require('./db');

async function recordEvent(client, { eventId, type, payload }) {
  const { rows } = await client.query(
    `INSERT INTO webhook_events (event_id, type, payload, status)
     VALUES ($1, $2, $3, 'received')

Idempotent Stripe Webhook Processing With an Express Event-Store Middleware

express webhooks idempotency
by codesnips 3 tabs
javascript 
const pino = require('pino');
const { AsyncLocalStorage } = require('async_hooks');

const als = new AsyncLocalStorage();

const logger = pino({

Request-Scoped Correlation ID Middleware and Child Logger in Express

express middleware logging
by codesnips 3 tabs
java 
import java.time.Duration;
import java.util.concurrent.ThreadLocalRandom;
import java.util.function.Predicate;

public final class RetryPolicy {
    private final int maxAttempts;

Async Retry With Exponential Backoff and Full Jitter Using ScheduledExecutorService

java retry backoff
by codesnips 3 tabs
go 
package migrate

import (
  "context"

  "github.com/jackc/pgx/v5/pgxpool"

Run database migrations on startup (with a guard)

go postgres migrations
by Leah Thompson 1 tab
ruby 
class CircuitBreaker
  class CircuitOpenError < StandardError; end

  def initialize(name, redis: Redis.current, failure_threshold: 5, failure_window: 60, cooldown: 30)
    @key = "circuit:#{name}"
    @redis = redis

Service-Level “Circuit Breaker” (Simple)

rails reliability http
by codesnips 3 tabs