Sum up provisioned write and read capacity for DynamoDB tables in a region

dynamo-capacity.js

// to install
//   brew install node
//   npm install aws-sdk queue-async

// to run
//   fill your shell with aws credentials http://docs.aws.amazon.com/cli/latest/userguide/cli-chap-getting-started.html
//   node dynamo-capacity.js

var AWS = require('aws-sdk');
var queue = require('queue-async');

var dynamodb = new AWS.DynamoDB({region: "us-east-1"});

var sums = {
    writes: 0,
    reads: 0
};

var q = queue();

dynamodb.listTables({Limit: 100}, function(err, data) {
    if (err) throw err;

    data.TableNames.forEach(function(table) {
        q.defer(function(cb) {
            dynamodb.describeTable({TableName: table}, function(err, data) {
                if (err) throw err;

                sums.reads += data.Table.ProvisionedThroughput.ReadCapacityUnits;
                sums.writes += data.Table.ProvisionedThroughput.WriteCapacityUnits;

                cb();
            });
        });

    });

    q.awaitAll(function() {
        console.log("Provisioned Write Capacity:", sums.writes);
        console.log("Provisioned Read Capacity: ", sums.reads);
    });
});