Gmail API limitations for getting mails

Question

As I understand currently google's API provides 10 requests per second to its API (from their docs), and it looks to be far from enough for comfortable work with mail. I need to get all emails' headers (or at least senders and recipients). Is there anything better than waiting numberOfMails / 10 seconds?

I'm currently accessing API from client side JavaScript application, I'm thinking of distributing API calls for the same user over a number of machines/applications, but's still unclear if their limits apply to gmail user or registered application.

Anyway, hope to get some ideas what to do with it, with current quota it's completely not usable.

The page you linked to states pretty clearly the usage limits: 10,000,000,000 quota units per day for all application requests, and 10 requests per second per gmail user. — Frxstrem
@Frxstrem is there something better then getting emails one by one then? — Artem Volkhin
@ArtemVolkhin I answered this question. Maybe you have the same question: stackoverflow.com/questions/24562981/… — gitter
@gitter it works (with limitation of 1000 request per batch -- developers.google.com/gmail/api/guides/batch) add it as an answer and I'll accept it — Artem Volkhin

gitter gitter · Accepted Answer · 2014-07-05T20:51:02

You can use batch requests to send multiple requests together. I spent a whole day this week figuring this out. The java code goes like this:

BatchRequest batchRequest = service.batch();
//callback function. (Can also define different callbacks for each request, as required)
JsonBatchCallback<Thread> callback = new JsonBatchCallback<Thread>() {

    @Override
    public void onSuccess(Thread t, HttpHeaders responseHeaders)
        throws IOException {
        System.out.println(t.getMessages().get(0).getPayload().getBody().getData());
    }

    @Override
    public void onFailure(GoogleJsonError e, HttpHeaders responseHeaders)
        throws IOException {

    }
};

// queuing requests on the batch request
for (Thread thread : threads) {
    service.users().threads().get("me", threads.getId()).queue(batchRequest, callback);
 }


batchRequest.execute();

Added by question's author: for those who also have this problem: https://developers.google.com/gmail/api/guides/batch and https://developers.google.com/api-client-library/javascript/features/rpcbatch. Although RpcBatch is deprecated it's working now and with limitation of 1000 request per batch.

Gmail API limitations for getting mails

2 Answers