CODEWITHSUNDEEP
dropbox-api
Clifton Labrum
Clifton Labrum

Reputation: 14118

Dropbox 400 Error in JavaScript Datastore API Request

I'm attempting to post a large number of records (2000-ish) to Dropbox via the Datastore JS API. I'm getting this error:

POST https://api12.dropbox.com/1/datastores/put_delta 400 (Bad Request)

...and it references: api12.dropbox.com/1/datastores/put_delta:1

That's not a lot of info to use when debugging, but I'm guess it's because I'm over the size limit.

Any ideas how I can fix this or at least debug it further?

Update

I used the XHR inspector in Chrome to get this response:

{"error": 
  {
  "size_limit": "Error: put_delta of delta (size 4138335) exceeds size limit 2097152 bytes",
  "object_type": "delta", 
  "limit": 2097152, 
  "size": 4138335
 }
}

Upvotes: 0

Views: 178

Answers (1)

user94559
user94559

Reputation: 60153

In the JS SDK, there's an implicit "sync" every time your code yields control back to the browser. So if you write a for loop entering a lot of data, that will all go into a single delta. You can break things up by writing in smaller chunks. For example, something like this (untested, sorry if there's an off-by-one error or the like):

var LIMIT = 100; // how many things to write in a single delta

function writeThings(arrayOfThings) {

    // write up to LIMIT things
    for (var i = 0; i < arrayOfThings.length && i < LIMIT; i++) {
        writeSingleThing(arrayOfThings[i]);
    }

    if (i < arrayOfThings.length) {
        // more to write

        window.setTimeout(function () {
            // after a tick, continue from where we left off
            writeThings(arrayOfThings.slice(i));
        }, 1);
    } else {
        // done writing
    }

}

Upvotes: 1

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