stream_body fragment include http_response feature (#588)

examples/stream_download.rb

@@ -9,8 +9,14 @@ url = "https://cdn.kernel.org/pub/linux/kernel/v4.x/#{filename}"
 
 File.open(filename, "w") do |file|
   response = HTTParty.get(url, stream_body: true) do |fragment|
-    print "."
-    file.write(fragment)
+    if [301, 302].include?(fragment.code)
+      print "skip writing for redirect"
+    elsif fragment.code == 200
+      print "."
+      file.write(fragment)
+    else
+      raise StandardError, "Non-success status code while streaming #{fragment.code}"
+    end
   end
 end
 puts

lib/httparty/fragment_with_response.rb

@@ -0,0 +1,20 @@
+require 'delegate'
+
+module HTTParty
+  # Allow access to http_response and code by delegation on fragment
+  class FragmentWithResponse < SimpleDelegator
+    extend Forwardable
+
+    attr_reader :http_response
+
+    def code
+      @http_response.code.to_i
+    end
+
+    def initialize(fragment, http_response)
+      @fragment = fragment
+      @http_response = http_response
+      super fragment
+    end
+  end
+end

lib/httparty/request.rb

@@ -1,5 +1,6 @@
 require 'erb'
 require 'httparty/request/body'
+require 'httparty/fragment_with_response'
 
 module HTTParty
   class Request #:nodoc:
@@ -148,7 +149,7 @@ module HTTParty
 
           http_response.read_body do |fragment|
             chunks << fragment unless options[:stream_body]
-            block.call(fragment)
+            block.call FragmentWithResponse.new(fragment, http_response)
           end
 
           chunked_body = chunks.join

spec/httparty/fragment_with_response_spec.rb

@@ -0,0 +1,14 @@
+require File.expand_path(File.join(File.dirname(__FILE__), '../spec_helper'))
+
+RSpec.describe HTTParty::FragmentWithResponse do
+  it "access to fragment" do
+    fragment = HTTParty::FragmentWithResponse.new("chunk", nil)
+    expect(fragment).to eq("chunk")
+  end
+  it "has access to delegators" do
+    response = double(code: '200')
+    fragment = HTTParty::FragmentWithResponse.new("chunk", response)
+    expect(fragment.code).to eq(200)
+    expect(fragment.http_response).to eq response
+  end
+end

spec/httparty_spec.rb

@@ -831,6 +831,8 @@ RSpec.describe HTTParty do
       expect(
         HTTParty.get('http://www.google.com', options) do |fragment|
           expect(chunks).to include(fragment)
+          expect(fragment.code).to eql 200
+          expect(fragment.http_response).to be
         end.parsed_response
       ).to eq(nil)
     end