BN

BN is a Battle.net API adapter and entity mapper.

Install

Bundler: `gem 'bn'`

RubyGems: `gem install bn`

Usage

Requiring

You can require the whole library with

require "bn"

Or you can require individual files/groups of files with

require "bn/api/d3"
require "bn/entity/d3"

API

Mapping

The BN::API::Mapper will send an HTTP request, parse the JSON response body, and create a new instance of the entity associated with the API call.

require "bn/api/mapper"

mapper = BN::API::Mapper.new(key: "00000000000000000000000000000000")

p mapper.d3.profile(battle_tag: "Example#0000") #=> #<BN::Entity::D3::Profile:0x007fa2a10e29a0 @battle_tag="Example#0000" ...>

If called without arguments, the mapper will return a BN::API::Mapping instance, which associates API calls with Entity instances. It also holds the list of middleware which the API HTTP response will go through before returning:

require "bn/api/mapper"

mapper = BN::API::Mapper.new(key: "00000000000000000000000000000000")
mapping = mapper.d3.profile

p mapping.api_class # => BN::API::D3
p mapping.api_method # => :profile
p mapping.middleware # => [BN::Middleware::HTTPResponse, BN::Middleware::KeyConverter, BN::Middleware::APIError, BN::Middleware::D3::Profile]

mapping.execute(battle_tag: "Example#0000") #=> #<BN::Entity::D3::Profile:0x007fa2a10e29a0 @battle_tag="Example#0000" ...>

This would allow you to manipulate the middleware before executing.

Entity

An entity is a subclass of BN::Entity::Base for profiles, characters, items, and other game items.

You can initialize entities with an object responding to #to_h or use attribute setters after initialization.

require "bn/entity/d3/hero"

hero = BN::Entity::D3::Hero.new(name: "Gronc")
hero.level = 70

Some entities also come with some helper methods for calculations:

hero.strength = 220

# Calculate the damage per second based on hero attributes
p hero.damage # => 12345

Middleware

Middleware converts data from one form to another, raising an error on failure.

For example, the BN::Middleware::HTTPResponse accepts anything that responds to #body and attempts to parse the body as JSON. If the response body could not be parsed or the JSON API response returned an error, then an error will be raised.

This is useful if you're not using BN::API to send HTTP requests to the Battle.net API.

require "net/http"
require "uri"
require "bn/middleware/http_response"

uri = URI("https://us.api.battle.net/d3/profile/Example-0000")
uri.query = URI.encode_www_form(apikey: "00000000000000000000000000000000", locale: "en_US")

response = Net::HTTP.get_response(uri)
data = BN::Middleware::HTTPResponse.execute(response)

p data # => { battle_tag: "Example#0000" }

Chaining

Middleware can be chained together if the result of one conforms to the requirements of another:

require "bn/api/d3"
require "bn/middleware/http_response"
require "bn/middleware/d3/profile"

api = BN::API::D3.new(key: "00000000000000000000000000000000")

response = api.profile(battle_tag: "Example#0000")

data = BN::Middleware::HTTPResponse.execute(response)
profile = BN::Middleware::D3::Profile.execute(data)

p profile #=> #<BN::Entity::D3::Profile:0x007fa2a10e29a0 @battle_tag="Example#0000" ...>

To make chaining easier, there is a helper method on BN::Middleware:

require "bn/api/d3"
require "bn/middleware"

api = BN::API::D3.new(key: "00000000000000000000000000000000")

response = api.profile(battle_tag: "Example#0000")

data = BN::Middleware::HTTPResponse.execute(response)
profile = BN::Middleware::D3::Profile.execute(data)
profile = BN::Middleware.execute(data, BN::Middleware::HTTPResponse, BN::Middleware::D3::Profile)

p profile #=> #<BN::Entity::D3::Profile:0x007fa2a10e29a0 @battle_tag="Example#0000" ...>

Middleware given can either be classes or instances. Usually subclassed from BN::Middleware::Base, but can be anything responding to #execute.

Subclassing

You can subclass BN::Middleware::Base to create your own transformations, such as manipulating JSON API responses or initializing your own profile/item/etc objects:

require "bn/middleware/base"

class HeroMiddleware < BN::Middleware::Base
  def execute(data)
    hero_data = data[:heroes].first

    Hero.new(data[:hero_data])
  end
end

class Hero
  def initialize(name)
    @name = name
  end

  attr_reader :name
end

require "bn/api/d3"
require "bn/middleware/http_response"

api = BN::API::D3.new(key: "00000000000000000000000000000000")

response = api.hero(battle_tag: "Example#0000", id: 1234)

data = BN::Transform::HTTPResponse.execute(response)
hero = HeroTransform.execute(data)

p hero #=> #<Hero:0x007fa2a10e29a0 @name="Gronc">

Copyright

The MIT License (MIT) - See LICENSE for further details.

BN