Dynamo Scan

Calls the aws-sdk's scan at a given throttle and calls an iterator function in parallel (max == throttle).

#Setup

The following environment variables must be set:

DYNAMO_REGION
DYNAMO_TABLE

scan(attributes, limit, ExclusiveStartKey, callback);

Returns limit number of rows from dynamo. If ExclusiveStartKey is set, it will start from that row.

    var db = require('dynamo_scan');

    db.scan('user_id', 5, null, function(err, items, LastEvaluatedKey)         
        cb();
    });

scanAll(attributes, throttle, iterator, done);

The iterator function will be called in parallel up to throttle until all items have been iterated.

    var db = require('dynamo_scan');

    db.scanAll('user_id', 5, function iterator(rows, cb) { 
        cb();
    }, function finished() { 
        console.log('done', arguments) 
    });