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shortner.go
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shortner.go
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package main
import (
"encoding/json"
"io/ioutil"
"log"
"net/http"
"os"
"sync"
"time"
"github.com/gin-gonic/gin"
)
type URLData struct {
URL string
Count int
}
type URLStore struct {
urls map[string]*URLData
mux sync.RWMutex
}
var store = &URLStore{
urls: make(map[string]*URLData),
}
func (s *URLStore) Set(alias string, data *URLData) {
s.mux.Lock()
defer s.mux.Unlock()
s.urls[alias] = data
}
func (s *URLStore) Get(alias string) (*URLData, bool) {
s.mux.RLock()
defer s.mux.RUnlock()
urlData, exists := s.urls[alias]
return urlData, exists
}
func (s *URLStore) Increment(alias string) {
s.mux.Lock()
defer s.mux.Unlock()
s.urls[alias].Count++
}
func createAlias(c *gin.Context) {
var aliasRequest struct {
URL string `json:"url" binding:"required"`
}
if err := c.ShouldBindJSON(&aliasRequest); err != nil {
c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
return
}
alias := c.Param("alias")
store.Set(alias, &URLData{URL: aliasRequest.URL})
c.JSON(http.StatusOK, gin.H{"alias": alias})
}
func getAlias(c *gin.Context) {
alias := c.Param("alias")
urlData, exists := store.Get(alias)
if !exists {
c.JSON(http.StatusNotFound, gin.H{"error": "Alias not found"})
return
}
store.Increment(alias)
c.Redirect(http.StatusMovedPermanently, urlData.URL)
}
func saveToDisk() {
store.mux.RLock()
defer store.mux.RUnlock()
jsonData, err := json.Marshal(store.urls)
if err != nil {
log.Fatalf("Failed to marshal store.urls: %v", err)
}
if err := ioutil.WriteFile("store.json", jsonData, 0644); err != nil {
log.Fatalf("Failed to write to file: %v", err)
}
}
func loadFromDisk() {
jsonData, err := os.ReadFile("store.json")
if err != nil {
log.Fatalf("Failed to read file: %v", err)
}
var urls map[string]*URLData
if err := json.Unmarshal(jsonData, &urls); err != nil {
log.Fatalf("Failed to unmarshal JSON data: %v", err)
}
store.urls = urls
}
func listStats(c *gin.Context) {
store.mux.RLock()
defer store.mux.RUnlock()
c.JSON(http.StatusOK, store.urls)
}
func main() {
loadFromDisk()
r := gin.New()
r.POST("/:alias", createAlias)
r.GET("/:alias", getAlias)
r.GET("/stats", listStats)
r.StaticFile("stats.html", "./assets/stats.html")
r.GET("/", func(c *gin.Context) {
index := "<html><body>Nothing to see here!</body></html>"
c.Writer.WriteHeader(http.StatusOK)
c.Writer.Write([]byte(index))
})
ticker := time.NewTicker(10 * time.Second)
go func() {
for range ticker.C {
saveToDisk()
}
}()
log.Fatal(r.Run(":3030"))
}