Selenium Webdriver JavaScript Promises

Question

I'm trying to grab HTML from a web page using JavaScript and Selenium behind Nodejs. The Webdriver is using Promises and no matter what I try, all I seem to be able to access is the promise. I started down this path thinking that

driver.page_source

would work, but that was a non-starter both before the promise and the in the callback.

Here's my code:

var webdriver = require("selenium-webdriver");

var urlRoot = "http://www.google.com/finance";

var createWebDriver = function() {
    return new webdriver.Builder().withCapabilities(webdriver.Capabilities.chrome()).build();
};

exports.financials = function(symbol, callback) {
    var driver = createWebDriver();
    driver.get(urlRoot + "?q=" + symbol);

    driver.findElement(webdriver.By.linkText("Financials")).click();

    console.log("content? = " + driver.findElement(webdriver.By.tagName("body")).getAttribute("innerHTML"));
    console.log("table? = " + driver.findElement(webdriver.By.id("fs-table")).getAttribute("outerHTML"));
    var contentPromise = driver.getPageSource();

    contentPromise.then(function() {
        console.log("contentPromise = " + contentPromise);
        console.log("content? = " + driver.findElement(webdriver.By.id("fs-table")).getAttribute("outerHTML"));
        driver.quit();
        return callback(null, contentPromise);
    });
};

The output is:

  fetchFinancials
content? = Promise::90 {[[PromiseStatus]]: "pending"}
table? = Promise::119 {[[PromiseStatus]]: "pending"}
contentPromise = Promise::130 {[[PromiseStatus]]: "fulfilled"}
content? = Promise::360 {[[PromiseStatus]]: "pending"}

Does anyone know how to extract the HTML from the promise and/or driver?

Thanks in advance.