func LookupISBN(ctx ae.Context, country string, isbn isbn13.ISBN13) (resp *data.BookMetaData, err error) {
keyString := data.BookInfoPrototypeKey(ctx, isbn, country)
target := new(data.BookMetaData)
if _, err = mc.Gob.Get(ctx, keyString, target); err == nil {
target.Parent = country
resp = target
} else {
key := ds.NewKey(ctx, data.KindBookInfo, keyString, 0, nil)
if err = ds.Get(ctx, key, target); err == nil {
resp = target
resp.Parent = country
cacheISBNResult(ctx, keyString, resp)
}
}
return
}
func StoreISBNResult(ctx ae.Context, country string, isbn isbn13.ISBN13, book *data.BookMetaData) {
cacheISBNResult(ctx, data.BookInfoPrototypeKey(ctx, isbn, country), book)
ds.Put(ctx, book.DeriveKey(ctx), book)
}