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mame.go
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mame.go
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package ds
import (
"archive/zip"
"fmt"
"io/ioutil"
"log"
"net/http"
"os"
"path/filepath"
"strings"
"github.com/sselph/scraper/mamedb"
"github.com/syndtr/goleveldb/leveldb"
)
const (
mameDBName = "mame_history"
mameZipURL = "https://storage.googleapis.com/stevenselph.appspot.com/mamehist.zip"
mameZipName = "mamehist.zip"
mameMetaName = "mamehist.meta"
)
// MAME is a Data Source using mamedb and arcade-history.
type MAME struct {
db *leveldb.DB
}
func (m *MAME) GetID(p string) (string, error) {
b := filepath.Base(p)
id := b[:len(b)-len(filepath.Ext(b))]
return id, nil
}
func (m *MAME) GetName(p string) string {
return ""
}
func (m *MAME) Close() error {
return m.db.Close()
}
func (m *MAME) GetGame(id string) (*Game, error) {
g, err := mamedb.GetGame(id)
if err != nil {
return nil, err
}
game := NewGame()
game.ID = g.ID
game.GameTitle = g.Name
game.ReleaseDate = g.Date
game.Developer = g.Developer
game.Genre = g.Genre
game.Source = g.Source
game.Players = g.Players
game.Rating = g.Rating / 10.0
if g.Title != "" {
game.Images[IMG_TITLE] = g.Title
game.Thumbs[IMG_TITLE] = g.Title
}
if g.Snap != "" {
game.Images[IMG_SCREEN] = g.Snap
game.Thumbs[IMG_SCREEN] = g.Snap
}
if g.Marquee != "" {
game.Images[IMG_MARQUEE] = g.Marquee
game.Thumbs[IMG_MARQUEE] = g.Marquee
}
if g.Cabinet != "" {
game.Images[IMG_CABINET] = g.Cabinet
game.Thumbs[IMG_CABINET] = g.Cabinet
}
hi, err := m.db.Get([]byte(id), nil)
if err == nil {
desc, err := m.db.Get(hi, nil)
if err == nil {
game.Overview = string(desc)
}
}
return game, nil
}
func updateMAMEDB(version, p string) error {
log.Print("INFO: Checking for new MAME History.")
req, err := http.NewRequest("GET", mameZipURL, nil)
if err != nil {
return err
}
req.Header.Set("if-none-match", version)
resp, err := http.DefaultClient.Do(req)
if err != nil {
return err
}
defer resp.Body.Close()
if resp.StatusCode == http.StatusNotModified {
log.Printf("INFO: MAME History %s up to date.", version)
return nil
}
if resp.StatusCode != http.StatusOK {
return fmt.Errorf("got %v response", resp.Status)
}
dbp := filepath.Join(p, mameDBName)
err = os.RemoveAll(dbp)
if err != nil {
return err
}
err = os.Mkdir(dbp, 0775)
if err != nil {
return err
}
newVersion := resp.Header.Get("etag")
log.Printf("INFO: Upgrading MAME History: %s -> %s.", version, newVersion)
b, err := ioutil.ReadAll(resp.Body)
if err != nil {
return err
}
zf := filepath.Join(p, mameZipName)
err = ioutil.WriteFile(zf, b, 0664)
if err != nil {
return err
}
rc, err := zip.OpenReader(zf)
if err != nil {
return err
}
defer rc.Close()
for _, v := range rc.Reader.File {
n := v.FileHeader.Name
frc, err := v.Open()
if err != nil {
return err
}
defer frc.Close()
b, err = ioutil.ReadAll(frc)
if err != nil {
return err
}
err = ioutil.WriteFile(filepath.Join(dbp, n), b, 0664)
if err != nil {
return err
}
}
log.Print("INFO: Upgrade Complete.")
os.Remove(zf)
ioutil.WriteFile(filepath.Join(p, mameMetaName), []byte(newVersion), 0664)
return nil
}
func getMAMEDB(p string) (*leveldb.DB, error) {
var err error
if p == "" {
p, err = DefaultCachePath()
if err != nil {
return nil, err
}
}
err = mkDir(p)
var version string
if err != nil {
return nil, err
}
fp := filepath.Join(p, mameDBName)
mp := filepath.Join(p, mameMetaName)
if exists(fp) && exists(mp) {
b, err := ioutil.ReadFile(mp)
if err != nil {
return nil, err
}
version = strings.Trim(string(b[:]), "\n\r")
}
err = updateMAMEDB(version, p)
if err != nil {
return nil, err
}
db, err := leveldb.OpenFile(fp, nil)
if err != nil {
return nil, err
}
return db, nil
}
// NewMAME returns a new MAME. MAME should be closed when not needed.
func NewMAME(p string) (*MAME, error) {
db, err := getMAMEDB(p)
if err != nil {
return nil, err
}
return &MAME{db}, nil
}