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net.go
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//go:build !embed
package webui
import (
"fmt"
"io"
"log/slog"
"net/http"
"os"
"path/filepath"
"github.com/alecthomas/kong"
gsa "github.com/Zxilly/go-size-analyzer"
"github.com/Zxilly/go-size-analyzer/internal/utils"
)
const BaseURL = "https://github.com/Zxilly/go-size-analyzer/releases/download/ui-v" +
gsa.StaticVersion +
"/index.html"
func GetTemplate() string {
tmpl, err := readTemplate()
if err != nil {
utils.FatalError(err)
}
return tmpl
}
func (UpdateCacheFlag) BeforeReset(app *kong.Kong, _ kong.Vars) error {
p, err := getCacheFilePath()
if err != nil {
return err
}
_, err = updateCache(p)
if err != nil {
return err
}
_, err = fmt.Fprintf(app.Stdout, "Cache updated: %s\n", p)
if err != nil {
return err
}
app.Exit(0)
return nil
}
func download() (string, error) {
slog.Info("Downloading template")
resp, err := http.Get(BaseURL)
if err != nil {
return "", err
}
defer func(body io.ReadCloser) {
_ = body.Close()
}(resp.Body)
// check status code
if resp.StatusCode != http.StatusOK {
return "", fmt.Errorf("failed to download template: %s", resp.Status)
}
body, err := io.ReadAll(resp.Body)
if err != nil {
return "", err
}
return string(body), nil
}
func getCacheFilePath() (string, error) {
dir, err := os.UserCacheDir()
if err != nil {
return "", err
}
cacheDir := filepath.Join(dir, "go-size-analyzer")
err = os.MkdirAll(cacheDir, 0755)
if err != nil {
return "", err
}
file := filepath.Join(cacheDir, fmt.Sprintf("webui-v%s.html", gsa.StaticVersion))
return file, nil
}
func readTemplate() (string, error) {
cacheFile, err := getCacheFilePath()
if err != nil {
return "", err
}
if _, err := os.Stat(cacheFile); os.IsNotExist(err) {
tmpl, err := updateCache(cacheFile)
if err != nil {
return "", err
}
return tmpl, nil
}
tmplBytes, err := os.ReadFile(cacheFile)
if err != nil {
slog.Error(fmt.Sprintf("failed to read cache file: %v", err))
// still try to download the template
tmpl, err := download()
if err != nil {
return "", err
}
return tmpl, nil
}
return string(tmplBytes), nil
}
func updateCache(cacheFilePath string) (string, error) {
tmpl, err := download()
if err != nil {
return "", err
}
err = os.WriteFile(cacheFilePath, []byte(tmpl), 0600)
if err != nil {
return "", err
}
return tmpl, nil
}