func compositeISBNLookup(ctx ae.Context, country string, isbn isbn13.ISBN13) (resp *data.BookMetaData, err error) {
// look in my own library first - if this fails badly, abort anything further
if shelf, err := persistence.LookupBookshelf(ctx); err == nil {
if book := shelf.LookupInfo(isbn); book != nil {
return book, nil
}
} else {
return nil, err
}
var errors ae.MultiError
if book, err := persistence.LookupISBN(ctx, country, isbn); err == nil {
return book, nil
} else {
errors = append(errors, err)
}
if r, err := googlebooks.LookupISBN(ctx, country, isbn); err == nil {
persistence.StoreISBNResult(ctx, country, isbn, r)
return r, nil
} else {
errors = append(errors, err)
}
return nil, errors
}
func getVolumeBulk(call *Call) (reply *data.LookupReply, err error) {
var shelf *data.Bookshelf
if shelf, err = persistence.LookupBookshelf(call.Context); err == nil {
call.Context.Debugf("Bookshelf contains %d volumes", len(shelf.Books))
infos := shelf.Books
for _, str := range call.Request.URL.Query()["search"] {
matches := shelf.Search(str)
infos = make([]data.BookMetaData, len(matches))
for i, ptr := range matches {
infos[i] = *ptr
}
call.Context.Debugf("Filtered by \"%s\", down to %d entries: %v", str, len(infos), infos)
}
reply = &data.LookupReply{
Count: len(infos),
BookInfos: shelf.Books,
}
}
return
}