Google Books API

[McStubb]

With Google now throwing more and more frequent 429 rate limit messages. Is it possible to use the google books API instead of trying to scrape the general search results? By default each person's API key has a 1,000 query limit per day, and its not hard to request an increase (I currently have 15,000 queries per day).

[kovidgoyal]

calibre does currently use the google books api first, and only if a match is not found is a web search done. And even for the amazon plugin when google starts return 429 errors, the plugin now fallsback automatically to using duckduckgo instead.

[McStubb]

I'm using the most recent version of calibre and all plugins are updated:
Its not falling back to duck duck go.

****************************** Google (1, 1, 0) ****************************** 
Found 0 results 
Downloading from Google took 3.369441032409668 
Making query: https://books.google.com/books/feeds/volumes?q=intitle%3ADay+intitle%3Aof+intitle%3AReckoning%2Binauthor%3AJohn+inauthor%3AWinchester&max-results=20&start-index=1&min-viewability=none
No results found, doing a web search instead
Making query: https://www.google.com/search?q=Day+of+Reckoning+John+Winchester&tbm=bks
Plugin Google failed
Traceback (most recent call last):
  File "calibre\ebooks\metadata\sources\identify.py", line 47, in run
  File "", line 533, in identify
  File "", line 438, in identify_via_web_search
  File "", line 93, in query
  File "mechanize\_mechanize.py", line 241, in open_novisit
  File "mechanize\_mechanize.py", line 313, in _mech_open
mechanize._response.get_seek_wrapper_class..httperror_seek_wrapper: HTTP Error 429: Too Many Requests

[kovidgoyal]

The fallback is in the amazon plugin not the google books plugin. I could add one to the google books plugin as well, but I dont think its particularly useful since web search there is done only as a fallback when the google books api fails. AAre you seeing a lot of failures for the google books api?