/*
Does the actual google books API call.
*/
func lookupISBN(ctx appengine.Context, country string, isbn isbn13.ISBN13) (resp *data.BookMetaData, err error) {
var r *http.Response
url := fmt.Sprintf(lookupURLTemplate, uint64(isbn), country, apiKey)
ctx.Debugf("Calling %s", fmt.Sprintf(lookupURLTemplate, uint64(isbn), country, "<hidden>"))
client := urlfetch.Client(ctx)
if r, err = client.Get(url); err == nil {
if r.StatusCode != http.StatusOK {
err = fmt.Errorf("Google API returned %s", r.Status)
} else {
reply := new(data.LookupReply)
decode := json.NewDecoder(r.Body)
defer r.Body.Close()
ctx.Infof("Completed API call, result %s\n", r.Status)
if err = decode.Decode(reply); err == nil {
if reply.Count == 1 {
resp = &reply.BookInfos[0]
} else {
ctx.Infof("Google books reported %d matching items: %v", reply.Count, reply)
resp = new(data.BookMetaData)
resp.Volume.Title = placeHolderText + isbn.String()
}
resp.Parent = country
resp.ISBN = isbn.String()
}
}
}
return
}
func putVolumeSingle(call *Call, isbn isbn13.ISBN13) (info *data.BookMetaData, err error) {
call.Context.Debugf("Updating %d", isbn)
decode := json.NewDecoder(call.Request.Body)
info = new(data.BookMetaData)
if err = decode.Decode(info); err == nil {
call.Context.Debugf("Raw decoded entity: %v", info)
info.ISBN = isbn.String()
normalize(call, info)
call.Context.Debugf("Normalized decoded entity: %v", info)
persistence.UpdateBookshelf(call.Context, func(t *tx.Transaction, shelf *data.Bookshelf) error {
if ptr := shelf.LookupInfo(isbn); ptr != nil {
*ptr = *info
t.Put = []tx.KeyDeriver{ptr}
} else {
info.Parent = shelf
shelf.Books = append(shelf.Books, *info)
t.Put = []tx.KeyDeriver{info}
}
return nil
})
}
return info, err
}
func (shelf *Bookshelf) LookupInfo(isbn isbn13.ISBN13) *BookMetaData {
for i := range shelf.Books {
book := &shelf.Books[i]
if book.ISBN == isbn.String() {
return book
}
}
return nil
}
func deleteVolumeSingle(call *Call, isbn isbn13.ISBN13) (info *data.BookMetaData, err error) {
call.Context.Infof("Deleting ISBN %d", isbn)
err = persistence.UpdateBookshelf(call.Context, func(t *tx.Transaction, shelf *data.Bookshelf) error {
for i := range shelf.Books {
if ptr := &shelf.Books[i]; ptr.ISBN == isbn.String() {
shelf.Books = append(shelf.Books[:i], shelf.Books[i+1:]...)
t.Delete = []tx.KeyDeriver{ptr}
return nil
}
}
call.StatusCode = http.StatusNotFound
return errors.New("ISBN not found")
})
return
}
func BookInfoPrototypeKey(ctx ae.Context, isbn isbn13.ISBN13, country string) string {
return country + ":" + isbn.String()
}