Code Explainers

Gin code explainers

go 
package handlers
 
import (
	"net/http"

Sparse fieldsets in a Gin handler

sparse-fieldsets query-parsing json-serialization
Intermediate 9 steps
go 
package middleware
 
import (
	"bytes"

Idempotent requests in Gin with Redis

idempotency caching middleware
Advanced 10 steps
go 
package handler
 
import (
	"net/http"

Custom time validation in Gin

validation request-binding struct-tags
Intermediate 8 steps
go 
package middleware
 
import (
	"net/http"

Localized validation errors in Gin

middleware internationalization validation
Intermediate 8 steps
go 
func ListProducts(c *gin.Context) {
	allowed := map[string]string{
		"category": "category",
		"brand":    "brand",

Safe query filtering in a Gin handler

input-validation whitelisting query-building
Intermediate 7 steps
go 
func (h *ExportHandler) BulkExport(c *gin.Context) {
	projectID := c.Param("projectID")
 
	reports, err := h.reports.ListByProject(c.Request.Context(), projectID)

Streaming a ZIP download in Gin

streaming zip-archive http-headers
Intermediate 8 steps
go 
package middleware
 
import (
	"crypto/sha256"

Deduplicating concurrent requests in Gin

singleflight request-coalescing middleware
Advanced 8 steps
go 
func (h *WebhookHandler) HandleBatch(c *gin.Context) {
	var payload BatchWebhookPayload
	if err := c.ShouldBindJSON(&payload); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid payload"})

Handling batched webhooks in Gin

webhooks signature-verification job-queue
Intermediate 7 steps
go 
package admin
 
import (
	"net/http"

Building a protected admin area in Gin

routing middleware authentication
Intermediate 6 steps
go 
package middleware
 
import (
	"errors"

Capping request body size in Gin

middleware request limits error handling
Intermediate 5 steps
go 
package handlers
 
import (
	"context"

Liveness vs readiness health checks in Gin

health-checks dependency-injection context-timeout
Intermediate 7 steps
go 
package handlers
 
import (
	"net/http"

Custom query validation in Gin

validation query-binding deduplication
Intermediate 8 steps
go 
package middleware
 
import (
	"log"

Per-IP rate limiting middleware in Gin

rate-limiting middleware concurrency
Intermediate 8 steps
go 
package render
 
import (
	"net/http"

How Gin renders MsgPack responses

serialization content-type interface-implementation
Intermediate 5 steps
go 
package middleware
 
import (
	"net/http"

A per-IP rate limiter middleware in Gin

rate-limiting token-bucket middleware
Intermediate 8 steps
go 
package theme
 
import (
	"fmt"

Per-tenant HTML templates with Gin's renderer

multi-tenancy concurrency html-templates
Advanced 8 steps
go 
package middleware
 
import (
	"net/http"

A maintenance-mode gate in Gin

middleware atomic-flag concurrency
Intermediate 8 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