Add bind option to Typhoeus [#154]

lib/faraday/adapter/typhoeus.rb

@@ -40,6 +40,7 @@ module Faraday
         configure_ssl     req, env
         configure_proxy   req, env
         configure_timeout req, env
+        configure_socket  req, env
 
         req.on_complete do |resp|
           if resp.timed_out?
@@ -87,6 +88,12 @@ module Faraday
         req.timeout = req.connect_timeout = (env_req[:timeout] * 1000) if env_req[:timeout]
         req.connect_timeout = (env_req[:open_timeout] * 1000)          if env_req[:open_timeout]
       end
+      
+      def configure_socket(req, env)
+        if bind = request_options(env)[:bind]
+          req.interface = bind[:host]
+        end
+      end
 
       def request_options(env)
         env[:request]

test/adapters/typhoeus_test.rb

@@ -9,6 +9,11 @@ module Adapters
       # https://github.com/dbalatero/typhoeus/issues/75
       undef :test_GET_with_body
     end
-
+    
+    def test_binds_local_socket
+      host = '1.2.3.4'
+      conn = create_connection :request => { :bind => { :host => host } }
+      assert_equal host, conn.options[:bind][:host]
+    end
   end unless defined? RUBY_ENGINE and 'jruby' == RUBY_ENGINE
 end