implementing the stream response

lib/httpx/plugins/stream.rb

@@ -7,27 +7,107 @@ module HTTPX
     #
     module Stream
       module InstanceMethods
-        def stream
-          headers("accept" => "text/event-stream",
-                  "cache-control" => "no-cache")
+        private
+
+        def request(*args, stream: false, **options)
+          return super(*args, **options) unless stream
+
+          requests = build_requests(*args, options)
+
+          raise Error, "only 1 response at a time is supported for streaming requests" unless requests.size == 1
+
+          StreamResponse.new(requests.first, self)
         end
       end
 
+      module RequestMethods
+        attr_accessor :stream
+      end
+
       module ResponseMethods
-        def complete?
-          super ||
-            stream? &&
-              @stream_complete
+        def stream
+          @request.stream
+        end
+      end
+
+      module ResponseBodyMethods
+        def initialize(*)
+          super
+          @stream = @response.stream
         end
 
-        def stream?
-          @headers["content-type"].start_with?("text/event-stream")
+        def write(chunk)
+          return super unless @stream
+
+          @stream.on_chunk(chunk)
         end
 
-        def <<(data)
-          res = super
-          @stream_complete = true if String(data).end_with?("\n\n")
-          res
+        private
+
+        def transition(*)
+          return if @stream
+
+          super
+        end
+      end
+
+      class StreamResponse
+        def initialize(request, session)
+          @request = request
+          @session = session
+          @options = @request.options
+        end
+
+        def each_line
+          raise Error, "response already streamed" if @response
+
+          Enumerator.new do |yielder|
+            @request.stream = self
+
+            @chunk_fiber = Fiber.new do
+              response
+              :done
+            end
+
+            loop do
+              chunk = @chunk_fiber.resume
+
+              break if chunk == :done
+
+              yielder << chunk
+            end
+          end
+        end
+
+        # This is a ghost method. It's to be used ONLY internally, when processing streams
+        def on_chunk(chunk)
+          raise NoMethodError unless @chunk_fiber
+
+          @on_chunk.call(chunk.dup)
+        end
+
+        # :nocov:
+        def inspect
+          "#<StreamResponse:#{object_id} >"
+        end
+        # :nocov:
+
+        private
+
+        def response
+          @response ||= @session.__send__(:send_requests, @request, @options).first
+        end
+
+        def respond_to_missing?(*args)
+          @options.response_class.respond_to?(*args) || super
+        end
+
+        def method_missing(meth, *args, &block)
+          if @options.response_class.public_method_defined?(meth)
+            response.__send__(meth, *args, &block)
+          else
+            super
+          end
         end
       end
     end

lib/httpx/response.rb

@@ -278,7 +278,7 @@ module HTTPX
 
     # rubocop:disable Style/MissingRespondToMissing
     def method_missing(meth, *, &block)
-      raise NoMethodError, "undefined response method `#{meth}' for error response" if Response.public_method_defined?(meth)
+      raise NoMethodError, "undefined response method `#{meth}' for error response" if @options.response_class.public_method_defined?(meth)
 
       super
     end