A Basic Riot API Client using Rest-Client + Command Line Wrapper to show how it's used

riotapi.rb

require 'rest-client'
require 'json'

module RiotAPI
  API_ROOT = 'https://na.api.pvp.net/api/lol/na/'

  class Client
    def initialize(api_key)
      @api_key = api_key
      @api = RestClient::Resource.new(API_ROOT, verify_ssl: OpenSSL::SSL::VERIFY_NONE)
    end

    def get(path)
      response = @api["#{path}?api_key=#{@api_key}"].get
      JSON.parse(response)
    end
  end

  class Summoner
    def self.find_summoners(client, names)
      names_csv = names.join(',')
      client.get("v1.4/summoner/by-name/#{names_csv}")
    end
  end

  class Stats
    def self.ranked(client, summoner_id)
      stats(client, summoner_id, 'ranked')
    end

    def self.summary(client, summoner_id)
      stats(client, summoner_id, 'summary')
    end

    def self.stats(client, summoner_id, type)
      client.get("v1.3/stats/by-summoner/#{summoner_id}/#{type}")
    end
  end
end

riotcli.rb

require './riotapi'
require 'pp' # pretty printing

puts "Enter your API Key:"
api_key = gets.chomp.strip
@client = RiotAPI::Client.new(api_key)

def client
  @client
end

def read_command
  commands = {
    'f' => '[f]ind a summoner',
    'r' => '[r]anking of a summoner',
    's' => '[s]ummary of a summoner',
    'q' => '[q]uit'
  }
  puts "enter a command:"
  commands.each { |command, description| puts description }
  command = gets.chomp.strip
  if commands.keys.include?(command)
    command
  else
    puts "'#{command}'' is not a valid command. Please try again."
    read_command
  end
end

def find_summoner
  puts "Enter a summoner name:"
  summoner = gets.chomp.strip
  puts "Finding details for '#{summoner}'"
  pp RiotAPI::Summoner.find_summoners(client, Array[summoner])
end

def get_stats_ranked
  puts "Enter a summoner ID:"
  id = gets.chomp.strip
  puts "Finding ranked statistics for SummonerID '#{id}'"
  pp RiotAPI::Stats.ranked(client, id)
end

def get_stats_summary
  puts "Enter a summoner ID:"
  id = gets.chomp.strip
  puts "Finding summarized statistics for SummonerID '#{id}'"
  pp RiotAPI::Stats.summary(client, id)
end

def process(command)
  case command.to_sym
  when :f then find_summoner
  when :r then get_stats_ranked
  when :s then get_stats_summary
  when :q then exit(0)
  else puts "hmm... that's weird. #{command} isn't allowed!"
  end
end

# Read / Eval / Print / Loop
# This is our console program, kinda like IRB
# but not really
while true
  command = read_command
  process(command)
end