Added file, explicitly set file-like response object.

.rubocop_todo.yml

@@ -1,52 +1,52 @@
 # This configuration was generated by `rubocop --auto-gen-config`
-# on 2014-12-16 11:52:50 -0500 using RuboCop version 0.29.1.
+# on 2015-06-03 09:20:43 -0400 using RuboCop version 0.29.1.
 # The point is for the user to remove these configuration records
 # one by one as the offenses are removed from the code base.
 # Note that changes in the inspected code, or installation of new
 # versions of RuboCop, may require this file to be generated again.
 
-# Offense count: 29
+# Offense count: 33
 # Cop supports --auto-correct.
 Lint/UnusedBlockArgument:
   Enabled: false
 
-# Offense count: 26
+# Offense count: 27
 # Cop supports --auto-correct.
 Lint/UnusedMethodArgument:
   Enabled: false
 
-# Offense count: 35
+# Offense count: 37
 Metrics/AbcSize:
-  Max: 50
+  Max: 48
 
-# Offense count: 1
+# Offense count: 2
 Metrics/BlockNesting:
   Max: 4
 
 # Offense count: 4
 # Configuration parameters: CountComments.
 Metrics/ClassLength:
-  Max: 245
+  Max: 246
 
-# Offense count: 15
+# Offense count: 23
 Metrics/CyclomaticComplexity:
   Max: 20
 
-# Offense count: 545
+# Offense count: 676
 # Configuration parameters: AllowURI, URISchemes.
 Metrics/LineLength:
   Max: 198
 
-# Offense count: 42
+# Offense count: 44
 # Configuration parameters: CountComments.
 Metrics/MethodLength:
   Max: 35
 
-# Offense count: 13
+# Offense count: 17
 Metrics/PerceivedComplexity:
   Max: 22
 
-# Offense count: 26
+# Offense count: 46
 # Cop supports --auto-correct.
 Style/Blocks:
   Enabled: false
@@ -57,7 +57,7 @@ Style/Blocks:
 Style/ClassCheck:
   Enabled: false
 
-# Offense count: 157
+# Offense count: 174
 Style/Documentation:
   Enabled: false
 
@@ -73,7 +73,7 @@ Style/EachWithObject:
 Style/EmptyElse:
   Enabled: false
 
-# Offense count: 14
+# Offense count: 15
 # Configuration parameters: MinBodyLength.
 Style/GuardClause:
   Enabled: false
@@ -89,7 +89,8 @@ Style/HashSyntax:
 Style/IndentArray:
   Enabled: false
 
-# Offense count: 18
+# Offense count: 20
+# Cop supports --auto-correct.
 Style/Lambda:
   Enabled: false
 
@@ -109,7 +110,7 @@ Style/PercentLiteralDelimiters:
 Style/PredicateName:
   Enabled: false
 
-# Offense count: 9
+# Offense count: 13
 # Configuration parameters: EnforcedStyle, SupportedStyles.
 Style/RaiseArgs:
   Enabled: false
@@ -119,7 +120,7 @@ Style/RaiseArgs:
 Style/RegexpLiteral:
   Enabled: false
 
-# Offense count: 4
+# Offense count: 11
 # Cop supports --auto-correct.
 # Configuration parameters: EnforcedStyle, SupportedStyles.
 Style/SpaceBeforeBlockBraces:

CHANGELOG.md

@@ -11,6 +11,7 @@
 * [#952](/~https://github.com/intridea/grape/pull/952): Status method now raises error when called with invalid status code - [@dabrorius](/~https://github.com/dabrorius).
 * [#957](/~https://github.com/intridea/grape/pull/957): Regexp validator now supports `allow_blank`, `nil` value behavior changed - [@calfzhou](https://giihub.com/calfzhou).
 * [#962](/~https://github.com/intridea/grape/pull/962): The `default` attribute with `false` value is documented now - [@ajvondrak](/~https://github.com/ajvondrak).
+* [#1026](/~https://github.com/intridea/grape/pull/1026): Added `file` method, explicitly setting a file-like response object - [@dblock](/~https://github.com/dblock).
 
 #### Fixes
 

README.md

@@ -2009,7 +2009,7 @@ class API < Grape::API
 end
 ```
 
-You can also set the response body explicitly with `body`.
+You can set the response body explicitly with `body`.
 
 ```ruby
 class API < Grape::API
@@ -2023,6 +2023,28 @@ end
 
 Use `body false` to return `204 No Content` without any data or content-type.
 
+You can also set the response to a file-like object with `file`.
+
+```ruby
+class FileStreamer
+  def initialize(file_path)
+    @file_path = file_path
+  end
+
+  def each(&blk)
+    File.open(@file_path, 'rb') do |file|
+      file.each(10, &blk)
+    end
+  end
+end
+
+class API < Grape::API
+  get '/' do
+    file FileStreamer.new('file.bin')
+  end
+end
+```
+
 ## Authentication
 
 ### Basic and Digest Auth

lib/grape/dsl/inside_route.rb

@@ -169,6 +169,22 @@ def body(value = nil)
         end
       end
 
+      # Allows you to define the response as a file-like object.
+      #
+      # @example
+      #   get '/file' do
+      #     file FileStreamer.new(...)
+      #   end
+      #
+      #   GET /file # => "contents of file"
+      def file(value = nil)
+        if value
+          @file = value
+        else
+          @file
+        end
+      end
+
       # Allows you to make use of Grape Entities by setting
       # the response body to the serializable hash of the
       # entity provided in the `:with` option. This has the

lib/grape/endpoint.rb

@@ -248,11 +248,13 @@ def run(env)
 
       run_filters after_validations
 
-      response_text = @block ? @block.call(self) : nil
+      response_object = @block ? @block.call(self) : nil
       run_filters afters
       cookies.write(header)
 
-      [status, header, [body || response_text]]
+      # The Body commonly is an Array of Strings, the application instance itself, or a File-like object.
+      response_object = file || [body || response_object]
+      [status, header, response_object]
     end
 
     def build_middleware

lib/grape/middleware/formatter.rb

@@ -29,9 +29,13 @@ def after
         api_format = mime_types[headers[Grape::Http::Headers::CONTENT_TYPE]] || env['api.format']
         formatter = Grape::Formatter::Base.formatter_for api_format, options
         begin
-          bodymap = bodies.collect do |body|
-            formatter.call body, env
-          end
+          bodymap = if bodies.respond_to?(:collect)
+                      bodies.collect do |body|
+                        formatter.call body, env
+                      end
+                    else
+                      bodies
+                    end
         rescue Grape::Exceptions::InvalidFormatter => e
           throw :error, status: 500, message: e.message
         end

spec/grape/dsl/inside_route_spec.rb

@@ -195,6 +195,22 @@ def initialize
         end
       end
 
+      describe '#file' do
+        describe 'set' do
+          before do
+            subject.file 'file'
+          end
+
+          it 'returns value' do
+            expect(subject.file).to eq 'file'
+          end
+        end
+
+        it 'returns default' do
+          expect(subject.file).to be nil
+        end
+      end
+
       describe '#route' do
         before do
           subject.env['rack.routing_args'] = {}

spec/grape/endpoint_spec.rb

@@ -927,4 +927,18 @@ def memoized
       expect(last_response.status).to eq(406)
     end
   end
+
+  context 'binary' do
+    before do
+      subject.get do
+        file FileStreamer.new(__FILE__)
+      end
+    end
+
+    it 'suports stream objects in response' do
+      get '/'
+      expect(last_response.status).to eq 200
+      expect(last_response.body).to eq File.read(__FILE__)
+    end
+  end
 end

spec/support/file_streamer.rb

@@ -0,0 +1,11 @@
+class FileStreamer
+  def initialize(file_path)
+    @file_path = file_path
+  end
+
+  def each(&blk)
+    File.open(@file_path, 'rb') do |file|
+      file.each(10, &blk)
+    end
+  end
+end