Market Bot - Ruby scraper for Google Play (Android Market)

Market Bot is a high performance Ruby scraper for Google's Android Market with a simple to use API. Currently it supports scraping apps, leaderboards, and app searches. Books, music, movies, etc aren't currently supported. It is built on top of Nokogiri and Typhoeus. Used in production to power www.droidmeter.com.

This project is currently seeking developers to help maintain it. Please send pull requests or contact me if you are able to help out. The app, leaderboard, and app search features are known to work, but the developer scraper is currently broken.

Dependencies

Nokogiri
Typhoeus

Installation

gem install market_bot

Simple API Examples

require 'rubygems'
require 'market_bot'

# Download/parse the leaderboard.
lb = MarketBot::Android::Leaderboard.new(:topselling_free, :game)
lb.update

# Download/parse the details for the first and last entries of the leaderboard.
first_app = MarketBot::Android::App.new(lb.results.first[:market_id])
last_app = MarketBot::Android::App.new(lb.results.last[:market_id])
first_app.update
last_app.update
puts "First place app (#{first_app.title}) price: #{first_app.price}"
puts "Last place app (#{last_app.title}) price: #{last_app.price}"

# Search for apps.
sq = MarketBot::Android::SearchQuery.new('donkeys')
sq.update
puts "Results found: #{sq.results.count}"

# Download/parse developer pages.
developer = MarketBot::Android::Developer.new('Zynga')
developer.update
puts "Results found: #{developer.results.count}"

# Print the rating for an app.
puts MarketBot::Android::App.new('com.king.candycrushsaga').update.rating

# Check if an app exists and has a title.
def app_exists?(app_id)
  begin
    return !!MarketBot::Android::App.new(app_id).update.title
  rescue
    return false
  end
end
app_exists?('com.king.candycrushsaga')  # Return's true.
app_exists?('com.some.fake.app.that.does.not.exist')  # Return's false.

Advanced API Examples

require 'rubygems'
require 'market_bot'

# Create a reusable hydra object with 5 http workers.
hydra = Typhoeus::Hydra.new(:max_concurrency => 5)

# Download/parse the leaderboard.
lb = MarketBot::Android::Leaderboard.new(:topselling_free, :game, :hyda => hydra)
lb.update

# Download/parse the details for the first and last entries of the leaderboard using the batch API.
first_app = MarketBot::Android::App.new(lb.results.first[:market_id], :hydra => hydra)
last_app = MarketBot::Android::App.new(lb.results.last[:market_id], :hydra => hydra)
first_app.enqueue_update
last_app.enqueue_update do |a|
  # Callback example.  This block will execute on a successful hydra.run.
  puts "Callback... title: #{a.title}"
end
hydra.run

# You must manually check if an error occurred when using the batch API without callbacks.
puts "First place app (#{first_app.title}) price: #{first_app.price}" unless first_app.error
puts "Last place app (#{last_app.title}) price: #{last_app.price}" unless last_app.error

Excessive Use

Google will block your IP address if you attempt to scrape large quantities of data. Please contact me if you are looking for commercial data solutions.

Contributing to Market Bot

Check out the latest master to make sure the feature hasn't been implemented or the bug hasn't been fixed yet.
Check out the issue tracker to make sure someone already hasn't requested it and/or contributed it.
Fork the project.
Start a feature/bugfix branch.
Commit and push until you are happy with your contribution.
Make sure to add tests for it. This is important so I don't break it in a future version unintentionally.
Please try not to mess with the Rakefile, version, or history. If you want to have your own version, or is otherwise necessary, that is fine, but please isolate to its own commit so I can cherry-pick around it.

nwmartin / market_bot