Add 'each' that iterates over all log files

Use 'select' to do an exact match when seeking a specific log file.

lib/fog/aws/models/rds/log_files.rb

@@ -6,21 +6,44 @@ module Fog
     class RDS
 
       class LogFiles < Fog::Collection
+        attribute :filters
         attribute :rds_id
         model Fog::AWS::RDS::LogFile
 
-        def all
-          data = service.describe_db_log_files(rds_id).body['DescribeDBLogFilesResult']['DBLogFiles']
-          load(data) # data is an array of attribute hashes
+        def initialize(attributes)
+          self.filters ||= {}
+          super
+        end
+
+        # This method deliberately returns only a single page of results
+        def all(filters=filters)
+          self.filters.merge!(filters)
+
+          result = service.describe_db_log_files(rds_id, filters).body['DescribeDBLogFilesResult']
+          self.filters[:marker] = result['Marker']
+          load(result['DBLogFiles'])
+        end
+
+        def each(filters=filters)
+          if block_given?
+            begin
+              page = self.all(filters)
+              # We need to explicitly use the base 'each' method here on the page, otherwise we get infinite recursion
+              base_each = Fog::Collection.instance_method(:each)
+              base_each.bind(page).call { |log_file| yield log_file }
+            end while self.filters[:marker]
+          end
+          self
         end
 
         def get(file_name=nil)
-          data = service.describe_db_log_files(rds_id, {:filename_contains => file_name}).body['DescribeDBLogFilesResult']['DBLogFiles'].first
-          new(data) # data is an attribute hash
+          if file_name
+            matches = self.select {|log_file| log_file.name.upcase == file_name.upcase}
+            return matches.first unless matches.empty?
+          end
         rescue Fog::AWS::RDS::NotFound
-          nil
         end
-
+        nil
       end
     end
   end