Add default client, accessible through TempoDB module

.gitignore

@@ -2,3 +2,4 @@
 .rspec
 Gemfile.lock
 *.swp
+.bundle

README.md

@@ -15,7 +15,7 @@ gem install tempodb-1.0.0.gem
 require 'tempodb'
 
 client = TempoDB::Client.new('database_id', 'api_key', 'api_secret')
-client.create_series("temp-1')
+client.create_series('temp-1')
 client.list_series
 ```
 

lib/tempodb.rb

@@ -1,12 +1,50 @@
 require 'rubygems'
 
 require 'tempodb/client'
+require 'tempodb/config'
 
 module TempoDB
   API_HOST = "api.tempo-db.com"
   API_PORT = 443
   API_VERSION = "v1"
 
   TRUSTED_CERT_FILE = File.join(File.dirname(__FILE__), "trusted-certs.crt")
+
+  class << self
+
+    def config
+      @config ||= Config.new
+    end
+
+    # Configure a default TempoDB API Client
+    #
+    # ==== Example
+    #
+    #    TempoDB.configure do |config|
+    #      config.database_id = 'database_id'
+    #      config.key         = 'api_key'
+    #      config.secret      = 'api_secret'
+    #    end
+    #
+    def configure
+      yield(config)
+      self.client = nil
+    end
+
+    attr_writer :client
+
+    def client
+      @client ||= Client.new(*config.to_a)
+    end
+
+    # Delegate every public instance method of Client to TempoDB.client
+    Client.public_instance_methods(false).each do |method|
+      class_eval <<-RUBY, __FILE__, __LINE__ + 1
+        def #{method}(*args, &block)
+          client.#{method}(*args, &block)
+        end
+      RUBY
+    end
+  end
 end
 

lib/tempodb/config.rb

@@ -0,0 +1,18 @@
+module TempoDB
+  class Config
+
+    OPTIONS = [:database_id, :api_key, :api_secret, :host, :port, :secure].freeze
+
+    attr_accessor *OPTIONS
+
+    def initialize
+      @host   = TempoDB::API_HOST
+      @port   = TempoDB::API_PORT
+      @secure = true
+    end
+
+    def to_a
+      OPTIONS.collect { |option| send(option) }
+    end
+  end
+end

spec/tempodb/config_spec.rb

@@ -0,0 +1,52 @@
+require 'spec_helper'
+
+describe TempoDB::Config do
+
+  subject(:config) do
+    described_class.new
+  end
+
+  it 'initializes with default host' do
+    expect(config.host).to eq('api.tempo-db.com')
+  end
+
+  it 'initializes with default port' do
+    expect(config.port).to eq(443)
+  end
+
+  it 'initializes with default secure' do
+    expect(config.secure).to be true
+  end
+
+  [:database_id, :api_key, :api_secret, :host, :port, :secure].each do |option|
+
+    describe "#{option}" do
+
+      it 'is a configurable option' do
+        config.send(:"#{option}=", 'foo')
+        expect(config.send(option)).to eq('foo')
+      end
+    end
+  end
+
+  describe '#to_a' do
+
+    let(:config) do
+      TempoDB::Config.new.tap do |config|
+        config.database_id = 'database'
+        config.api_key     = 'key'
+        config.api_secret  = 'secret'
+      end
+    end
+
+    subject(:array) do
+      config.to_a
+    end
+
+    it 'returns array of config values for Client#initialize' do
+      expect(array).to eq([
+        'database', 'key', 'secret', 'api.tempo-db.com', 443, true
+      ])
+    end
+  end
+end

spec/tempodb_spec.rb

@@ -0,0 +1,73 @@
+require 'spec_helper'
+
+describe TempoDB do
+
+  after do
+    TempoDB.instance_variable_set :@client, nil
+    TempoDB.instance_variable_set :@config, nil
+  end
+
+  describe '.config' do
+
+    it 'returns same instance of Config' do
+      expect(TempoDB.config).to be_a(TempoDB::Config)
+      expect(TempoDB.config.object_id).to eq(TempoDB.config.object_id)
+    end
+  end
+
+  describe '.configure' do
+
+    it 'yields TempoDB.config' do
+      expect { |b| TempoDB.configure(&b) }.to yield_with_args(TempoDB.config)
+    end
+
+    it 'reinitializes TempoDB client' do
+      original_client = TempoDB.client
+      TempoDB.configure do |config|
+        config.database_id = 'foo'
+      end
+      expect(original_client.object_id).not_to eq(TempoDB.client.object_id)
+    end
+  end
+
+  describe '.client' do
+
+    before do
+      TempoDB.configure do |config|
+        config.database_id = 'mydb'
+        config.api_key     = 'api_key'
+        config.api_secret  = 's3cr3t!'
+        config.host        = 'example.com'
+        config.port        = 1337
+        config.secure      = false
+      end
+    end
+
+    it 'initializes Client with TempoDB config' do
+      expect(TempoDB::Client).to receive(:new).with(
+        'mydb', 'api_key', 's3cr3t!', 'example.com', 1337, false
+      )
+      TempoDB.client
+    end
+
+    it 'returns same Client instance' do
+      expect(TempoDB::Client.object_id).to eq(TempoDB::Client.object_id)
+    end
+  end
+
+  [
+    :session, :create_series, :delete_series, :get_series, :list_series,
+    :update_series, :read_data, :get_summary, :read_multi_rollups, :find_data,
+    :aggregate_data, :read_multi, :write_data, :write_multi, :single_value,
+    :multi_series_single_value, :delete_data
+  ].each do |method|
+
+    describe ".#{method}" do
+
+      it 'delegates to TempoDB.client' do
+        expect(TempoDB.client).to receive(method)
+        TempoDB.send(method)
+      end
+    end
+  end
+end