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package xesite
import (
"archive/zip"
"compress/gzip"
"encoding/json"
"fmt"
"io"
"log/slog"
"net/http"
"os"
"path/filepath"
"sync"
"time"
)
const (
compressionGZIP = 0x69
)
func init() {
zip.RegisterCompressor(compressionGZIP, func(w io.Writer) (io.WriteCloser, error) {
return gzip.NewWriterLevel(w, gzip.BestCompression)
})
zip.RegisterDecompressor(compressionGZIP, func(r io.Reader) io.ReadCloser {
rdr, err := gzip.NewReader(r)
if err != nil {
slog.Error("can't read from gzip stream", "err", err)
panic(err)
}
return rdr
})
}
type ZipServer struct {
dir string
lock sync.RWMutex
zip *zip.ReadCloser
}
func NewZipServer(zipPath, dir string) (*ZipServer, error) {
result := &ZipServer{dir: dir}
if _, err := os.Stat(zipPath); !os.IsNotExist(err) {
file, err := zip.OpenReader(zipPath)
if err != nil {
return nil, err
}
result.zip = file
}
return result, nil
}
func (zs *ZipServer) NukeGeneration(w http.ResponseWriter, r *http.Request) {
gen := r.URL.Query().Get("gen")
os.Remove(filepath.Join(zs.dir, "xesite", gen))
fmt.Fprintln(w, "removed", gen)
}
func (zs *ZipServer) ListGenerations(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/json")
// list files in zs.dir/xesite
var files []string
dirEntries, err := os.ReadDir(filepath.Join(zs.dir, "xesite"))
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
slog.Error("can't read dir", "err", err, "dir", filepath.Join(zs.dir, "xesite"))
return
}
for _, dirEntry := range dirEntries {
if dirEntry.IsDir() {
continue
}
if dirEntry.Name() == "latest.zip" {
continue
}
files = append(files, dirEntry.Name())
}
json.NewEncoder(w).Encode(files)
}
func (zs *ZipServer) UploadNewZip(w http.ResponseWriter, r *http.Request) {
fname := fmt.Sprintf("xesite-%s.zip", time.Now().Format("2006-01-02T15-04-05"))
fpath := filepath.Join(zs.dir, "xesite", fname)
fout, err := os.Create(fpath)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
slog.Error("can't create file", "err", err, "fpath", fpath)
return
}
defer fout.Close()
if _, err := io.Copy(fout, r.Body); err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
slog.Error("can't write file", "err", err, "fpath", fpath)
return
}
if err := fout.Close(); err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
slog.Error("can't close file", "err", err, "fpath", fpath)
return
}
if err := zs.Update(fpath); err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
slog.Error("can't update zip", "err", err, "fpath", fpath)
return
}
os.Link(fpath, filepath.Join(zs.dir, "xesite", "latest.zip"))
if err := deleteOldestFileInFolder(filepath.Join(zs.dir, "xesite")); err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
slog.Error("can't delete oldest file", "err", err)
return
}
}
func (zs *ZipServer) Update(fname string) error {
zs.lock.Lock()
defer zs.lock.Unlock()
old := zs.zip
file, err := zip.OpenReader(fname)
if err != nil {
return err
}
zs.zip = file
if old != nil {
old.Close()
}
slog.Info("activated new generation", "fname", fname)
return nil
}
func (zs *ZipServer) ServeHTTP(w http.ResponseWriter, r *http.Request) {
zs.lock.RLock()
defer zs.lock.RUnlock()
if zs.zip == nil {
http.Error(w, "no zip file", http.StatusNotFound)
return
}
http.FileServer(http.FS(zs.zip)).ServeHTTP(w, r)
}
func deleteOldestFileInFolder(folderPath string) error {
// Read the files in the folder
files, err := os.ReadDir(folderPath)
if err != nil {
return err
}
if len(files) == 0 {
slog.Debug("no files in the folder")
return nil
}
if len(files) < 5 {
slog.Debug("less than 5 files in the folder")
return nil
}
// Initialize variables to keep track of the oldest file
var oldestFile os.DirEntry
var oldestTime time.Time
// Find the oldest file in the folder
for _, file := range files {
fileInfo, err := file.Info()
if err != nil {
return err
}
if fileInfo.Name() == "latest.zip" {
continue
}
if oldestFile == nil || fileInfo.ModTime().Before(oldestTime) {
oldestFile = file
oldestTime = fileInfo.ModTime()
}
}
// Delete the oldest file
oldestFilePath := filepath.Join(folderPath, oldestFile.Name())
err = os.Remove(oldestFilePath)
if err != nil {
return err
}
slog.Info("deleted oldest generation", "path", oldestFilePath)
return nil
}
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