Code Explainers

Code explainers tagged #error handling

go 
func (h *ArticleHandler) Create(c *gin.Context) {
	var req struct {
		Title   string `json:"title" binding:"required"`
		Body    string `json:"body" binding:"required"`

Handling a POST request in Gin

request binding validation http status codes
Intermediate 7 steps
go 
package middleware
 
import (
	"errors"

Capping request body size in Gin

middleware request limits error handling
Intermediate 5 steps
ruby 
class PaymentGateway
  class MissingCredentialError < StandardError; end
 
  def initialize(env: Rails.env)

Wrapping Rails credentials in a gateway

encapsulation credentials error handling
Intermediate 6 steps
python 
from urllib.parse import urlparse, parse_qs
from dataclasses import dataclass, field
 
ALLOWED_SCHEMES = {"http", "https"}

Validating URLs into a safe endpoint in Python

input validation url parsing dataclasses
Intermediate 7 steps
go 
func ServeVideo(c *gin.Context) {
	id := c.Param("id")
	video, err := videoRepo.FindByID(c.Request.Context(), id)
	if err != nil {

Streaming video files with Gin

http streaming range requests file serving
Intermediate 6 steps
go 
package dateutil
 
import (
	"fmt"

Parsing and formatting dates in Go

date parsing layouts timezones
Intermediate 7 steps
typescript 
import {
  Injectable,
  NestInterceptor,
  ExecutionContext,

A per-route timeout interceptor in NestJS

interceptors metadata reflection rxjs
Intermediate 8 steps
go 
package handlers
 
import (
	"errors"

Turning Gin binding errors into field messages

input validation struct tags error handling
Intermediate 9 steps
go 
package handlers
 
type BookURI struct {
	Collection string `uri:"collection" binding:"required,alphanum"`

Validating URI params in a Gin handler

input validation struct binding error handling
Intermediate 7 steps
php 
<?php
 
namespace App\Services\Provisioning;
 

Sequencing site setup with Laravel job chains

job chains queues async workflows
Intermediate 6 steps
go 
package handlers
 
import (
	"fmt"

Handling multipart profile uploads in Gin

form binding file upload validation
Intermediate 7 steps
ruby 
class Webhooks::StripeController < ApplicationController
  skip_before_action :verify_authenticity_token
  skip_before_action :authenticate_user!
 

How a Rails Stripe webhook controller works

webhooks signature verification event dispatch
Intermediate 7 steps
rust 
use axum::{
    body::Body,
    extract::Request,
    http::{header, StatusCode},

How bearer-auth middleware works in Axum

middleware authentication request extensions
Intermediate 7 steps
go 
package config
 
import (
	"encoding/json"

Parsing untyped JSON config in Go

json parsing type assertions error handling
Intermediate 7 steps
ruby 
class FundsTransfer
  class InsufficientFundsError < StandardError; end
 
  def initialize(source:, destination:, amount:)

Atomic money transfers with Rails transactions

service object database transactions row locking
Advanced 9 steps
javascript 
const express = require('express');
 
const v1 = express.Router();
 

Versioning an API with Express Routers

api versioning routing modularity
Intermediate 10 steps
go 
package handlers
 
type SignupRequest struct {
	Email           string `json:"email" binding:"required,email"`

Validated signup handler in Gin

request validation error handling http status codes
Intermediate 7 steps
ruby 
class CheckoutService
  Result = Struct.new(:success?, :order, :error, keyword_init: true)
 
  def self.call(...)

How a Rails checkout service object works

service object transactions result object
Intermediate 9 steps