Code Explainers

Go code explainers

go 
package deepcopy
 
import (
	"bytes"

Deep copying any value with gob in Go

deep-copy serialization generics
Intermediate 6 steps
go 
package handlers
 
import (
	"net/http"

Query-string filtering in Gin with GORM

query-binding validation conditional-queries
Intermediate 8 steps
go 
func ProxyDownload(c *gin.Context) {
	objectKey := c.Param("key")
	upstream := fmt.Sprintf("%s/files/%s", storageBaseURL, objectKey)
 

Streaming a proxied download in Gin

reverse-proxy streaming http-headers
Intermediate 8 steps
go 
package handlers
 
import (
	"net/http"

Header-driven API versioning in Gin

api-versioning header-binding closures
Intermediate 6 steps
go 
func ListArticles(db *gorm.DB) gin.HandlerFunc {
	return func(c *gin.Context) {
		page, err := strconv.Atoi(c.DefaultQuery("page", "1"))
		if err != nil || page < 1 {

Building a paginated list endpoint in Gin

pagination query-parameters input-validation
Intermediate 8 steps
go 
package parser
 
import (
	"fmt"

Parsing access logs with named regex groups in Go

regex named-groups parsing
Intermediate 5 steps
go 
package checksum
 
import (
	"crypto/sha256"

Computing SHA-256 checksums in Go

hashing io-streaming filesystem-walk
Intermediate 7 steps
go 
package dateutil
 
import (
	"fmt"

Parsing and formatting dates in Go

date parsing layouts timezones
Intermediate 7 steps
go 
package middleware
 
import (
	"bytes"

Building a response cache middleware in Gin

middleware caching concurrency
Intermediate 8 steps
go 
package archive
 
import (
	"bytes"

Gzip round-trip compression in Go

compression io error-handling
Intermediate 5 steps
go 
package handlers
 
import (
	"encoding/json"

Hardening JSON decoding in Go HTTP handlers

json error-handling http
Intermediate 8 steps
go 
package handlers
 
import (
	"net/http"

Validating query params with Gin binding tags

validation struct-tags pagination
Intermediate 8 steps
go 
package api
 
import (
	"encoding/json"

Building reusable JSON helpers in Go HTTP handlers

http json error-handling
Intermediate 9 steps
go 
package server
 
import (
	"net/http"

Serving cached static assets in Gin

caching static-files middleware
Intermediate 7 steps
go 
package middleware
 
import (
	"net/http"

Per-IP rate limiting middleware in Gin

rate-limiting token-bucket concurrency
Intermediate 7 steps
go 
package middleware
 
import (
	"net/http"

Building a CORS middleware in Gin

cors middleware closures
Intermediate 9 steps
go 
package middleware
 
import (
	"context"

How a request-timeout middleware works in Gin

middleware context goroutines
Advanced 6 steps
go 
package main
 
import (
	"context"

Graceful shutdown for a Gin server in Go

graceful-shutdown signals goroutines
Intermediate 6 steps