Added Config#service_class to override the SlackRubyBotServer::Service.instance singleton.

CHANGELOG.md

@@ -2,6 +2,7 @@
 
 #### 0.10.0 (Next)
 
+* [#97](https://github.com/slack-ruby/slack-ruby-bot-server/pull/97): Added `Config#service_class` to override the `SlackRubyBotServer::Service.instance` singleton - [@dblock](https://github.com/dblock).
 * [#96](https://github.com/slack-ruby/slack-ruby-bot-server/pull/96): Added `Team#bot_user_id`, `activated_user_id` and `activated_user_access_token` - [@dblock](https://github.com/dblock).
 * Your contribution here.
 

README.md

@@ -147,7 +147,6 @@ instance.on :creating do |team, error, options|
 end
 ```
 
-
 #### Server Class
 
 You can override the server class to handle additional events, and configure the service to use it.
@@ -168,6 +167,25 @@ SlackRubyBotServer.configure do |config|
 end
 ```
 
+#### Service Class
+
+You can override the service class to handle additional methods.
+
+```ruby
+class MyService < SlackRubyBotServer::Service
+  def url
+    'https://www.example.com'
+  end
+end
+
+SlackRubyBotServer.configure do |config|
+  config.service_class = MyService
+end
+
+SlackRubyBotServer::Service.instance # MyService
+SlackRubyBotServer::Service.instance.url # https://www.example.com
+```
+
 ### Access Tokens
 
 By default the implementation of [Team](lib/slack-ruby-bot-server/models/team) stores a `bot_access_token` as `token` that grants a certain amount of privileges to the bot user as described in [Slack OAuth Docs](https://api.slack.com/docs/oauth) along with `activated_user_access_token` that represents the token of the installing user. You may not want a bot user at all, or may require different auth scopes, such as `users.profile:read` to access user profile information via `Slack::Web::Client#users_profile_get`. To change required scopes make the following changes.

lib/slack-ruby-bot-server.rb

@@ -2,6 +2,7 @@
 
 require 'grape-swagger'
 require 'slack-ruby-bot'
+require 'slack-ruby-bot-server/service'
 require 'slack-ruby-bot-server/server'
 require 'slack-ruby-bot-server/config'
 
@@ -13,4 +14,3 @@
 
 require 'slack-ruby-bot-server/api'
 require 'slack-ruby-bot-server/app'
-require 'slack-ruby-bot-server/service'

lib/slack-ruby-bot-server/config.rb

@@ -3,10 +3,12 @@ module Config
     extend self
 
     attr_accessor :server_class
+    attr_accessor :service_class
     attr_accessor :database_adapter
 
     def reset!
       self.server_class = SlackRubyBotServer::Server
+      self.service_class = SlackRubyBotServer::Service
       self.database_adapter = if defined?(::Mongoid)
                                 :mongoid
                               elsif defined?(::ActiveRecord)

lib/slack-ruby-bot-server/service.rb

@@ -10,7 +10,7 @@ def self.start!
     end
 
     def self.instance
-      @instance ||= new
+      @instance ||= SlackRubyBotServer::Config.service_class.new
     end
 
     def initialize

spec/slack-ruby-bot-server/service_spec.rb

@@ -87,4 +87,23 @@ def initialize(options = {})
       expect(@events).to eq %w[starting started stopping stopped]
     end
   end
+  context 'overriding service_class' do
+    let(:service_class) do
+      Class.new(SlackRubyBotServer::Service) do
+        def url
+          'https://www.example.com'
+        end
+      end
+    end
+    after do
+      SlackRubyBotServer.config.reset!
+    end
+    it 'creates an instance of service class' do
+      SlackRubyBotServer.configure do |config|
+        config.service_class = service_class
+      end
+      expect(SlackRubyBotServer::Service.instance).to be_a service_class
+      expect(SlackRubyBotServer::Service.instance.url).to eq 'https://www.example.com'
+    end
+  end
 end