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Hi @txtualtrail,

Thanks for reporting this.

I've been looking up on the Google Books API and I'm fairly certain one of these things is happening.

• maximum requests made
• google books api key is required

Here:
http://superpowerplanet.com/content/drupal-google-book-filter-module
there are 3 books loading, but not 40. I'm guessing that the lack of an API field in the module is what is causing it and what is needed to have a larger number than a few requests made per minute / hour/ etc.

I was under the impression that as long as the data was public, that Google Books would always return data without a key, however I don't think this is the case.

So requests need to be like:

GET https://www.googleapis.com/books/v1/volumes?q=pride+prejudice&download=epub&key=yourAPIKey

The call to the API:

$bib = google_books_api_get_google_books_data($search_string, 0);

is not passing in an API key anywhere.

So what needs to be done (probably)

• In admin interface create a field for an API key as per: https://developers.google.com/books/docs/v1/using#APIKey
• For anywhere requesting data from the Google API, add on this key as a param and into the string.

I'm taking a guess here, but you may have found something where they have stronger requirements to use the API.

Thank you,

Thanks @txtualtrail, also there are things that would be nice to expand and improve as well. I'm looking into some of these areas, and please post back if/when you learn anything.

There appears to be an API limit (with a valid key) of 1000 per day, and the API Key can be created setup at: https://code.google.com/apis/console

Need to create a key for the Books API

then click on Quotas and will see:

Courtesy Limit

• Per-User Limit: 1.0 requests/second/user
• Used: 0%
• Courtesy Limit: 1,000 requests/day
• Link: Request more...
• Link: Set per-user limits...

If the per user limit Request More link is clicked, a new form to request more usage reads:
"Description: Please provide a description of your API usage."

I'm guessing that Google would be friendly to non-profit organizations for larger requests.

First we need to get that API Key into the module.

Thanks again,

Hello, I added an API Key to the module, the development head currently, which can be received at:
http://drupal.org/node/1372154/git-instructions/7.x-1.x/nonmaintainer
if you can pull it over with git.

This fix is working with the API Key at:
https://code.google.com/apis/console
and what could be helpful, is in the report tab, you can see how many out of the 1000 daily books you have used up.

Important: every time the cache is cleared, all 40 (or however many) books will try to re-load which will count against the daily limit for 1000, which can be extended if Google OK's the request. Otherwise, I would be careful clearing the cache as the books will need to slowly load back in.

If you (or anybody) can test the development git version at:
http://drupal.org/node/1372154/git-instructions/7.x-1.x/nonmaintainer
you can use the command: git clone --recursive --branch 7.x-1.x http://git.drupal.org/project/google_books.git
if you have git installed, we can get this tested, and I'll make a dev-release.

Thanks again @txtualtrail

Also made a dev release last night at the main page http://drupal.org/project/google_books and it has showed up.

(Just scroll down) 7.x-1.x-dev

If after running this for a while and it seems stable, please anyone post and let us know, and I'll make a 7.x-2.0 release before adding any of the new dev changes. Probably it should have always had the API key in there, but apparently Google allows usage without for a limited test number of requests.

Thanks for the feedback!

This has been working and no complaints, so I'm going to close this one out.

Getting an error here, so something may have changed with Google's API Key interface.

Looking into this.

It's working, Google's API interface changed. Tested an API Key and it worked, showing hits, and quota.

Fixed in 7.x-2.0 release.