shop
137 lines
2.5 KiB
Go
137 lines
2.5 KiB
Go
package main
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import (
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"context"
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"html/template"
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"io/fs"
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"log"
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"net/http"
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"os"
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"os/signal"
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"syscall"
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"time"
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"shop/internal/config"
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"shop/internal/database"
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"shop/internal/handlers"
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"shop/internal/repository"
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"shop/internal/web"
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)
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func main() {
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cfg, err := config.Load()
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if err != nil {
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log.Fatalf("config: %v", err)
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}
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ctx := context.Background()
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pool, err := database.Connect(ctx, cfg.DatabaseURL)
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if err != nil {
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log.Fatalf("database: %v", err)
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}
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defer pool.Close()
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tmpl, err := loadTemplates()
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if err != nil {
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log.Fatalf("templates: %v", err)
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}
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products := repository.NewProductRepository(pool)
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home := handlers.NewHomeHandler(products, tmpl)
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staticSub, err := fs.Sub(web.StaticFS, "static")
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if err != nil {
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log.Fatalf("static fs: %v", err)
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}
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mux := http.NewServeMux()
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mux.Handle("GET /static/", http.StripPrefix("/static/", http.FileServer(http.FS(staticSub))))
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mux.Handle("GET /health", http.HandlerFunc(handlers.Health))
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mux.Handle("GET /", home)
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srv := &http.Server{
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Addr: cfg.HTTPAddr,
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Handler: mux,
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ReadTimeout: cfg.ReadTimeout,
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WriteTimeout: cfg.WriteTimeout,
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}
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go func() {
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log.Printf("server listening on %s", cfg.HTTPAddr)
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if err := srv.ListenAndServe(); err != nil && err != http.ErrServerClosed {
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log.Fatalf("listen: %v", err)
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}
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}()
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quit := make(chan os.Signal, 1)
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signal.Notify(quit, syscall.SIGINT, syscall.SIGTERM)
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<-quit
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shutdownCtx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
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defer cancel()
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if err := srv.Shutdown(shutdownCtx); err != nil {
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log.Printf("shutdown: %v", err)
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}
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}
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func loadTemplates() (*template.Template, error) {
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funcMap := template.FuncMap{
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"formatPrice": func(v float64) string {
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return formatRub(v)
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},
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}
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return template.New("").Funcs(funcMap).ParseFS(web.TemplatesFS, "templates/*.html")
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}
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func formatRub(v float64) string {
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intPart := int64(v)
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frac := int64((v - float64(intPart)) * 100)
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if frac < 0 {
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frac = -frac
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}
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return formatThousands(intPart) + "," + pad2(frac) + " ₽"
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}
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func formatThousands(n int64) string {
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if n < 0 {
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n = -n
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}
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s := ""
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for n >= 1000 {
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s = "," + pad3(n%1000) + s
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n /= 1000
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}
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return itoa(n) + s
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}
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func pad3(n int64) string {
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if n < 10 {
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return "00" + itoa(n)
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}
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if n < 100 {
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return "0" + itoa(n)
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}
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return itoa(n)
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}
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func pad2(n int64) string {
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if n < 10 {
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return "0" + itoa(n)
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}
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return itoa(n)
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}
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func itoa(n int64) string {
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if n == 0 {
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return "0"
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}
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var b [20]byte
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i := len(b)
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for n > 0 {
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i--
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b[i] = byte('0' + n%10)
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n /= 10
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}
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return string(b[i:])
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}
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