Introduce Mock::Cache for VCR like functionality.

Author: ioquatix

lib/async/http/mock/cache.rb

@@ -0,0 +1,62 @@
+# frozen_string_literal: true
+#
+# Copyright, 2019, by Samuel G. D. Williams. <http://www.codeotaku.com>
+# 
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+# 
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+# 
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+
+require_relative '../protocol'
+
+module Async
+	module HTTP
+		module Mock
+			class Cache
+				Key = Struct.new(:method, :authority, :path, :headers, :body) do
+					def self.for(request)
+						self.new(request.method, request.authority, request.path, request.headers, request.body)
+					end
+				end
+				
+				def initialize(store = {})
+					@internet = Async::HTTP::Internet.new
+					@store = store
+				end
+				
+				attr :store
+				
+				def fetch(request)
+					@cache.fetch(Key.for(request)) do |key|
+						endpoint = @internet.endpoint_for(request)
+						response = @internet.client_for(endpoint).call(request)
+						response.body = Body::Buffered.wrap(response.body)
+						
+						@cache[key] = response
+					end
+				end
+				
+				def store(request, response)
+					@cache[Key.for(request)] = response
+				end
+				
+				def clear
+					@cache.clear
+				end
+			end
+		end
+	end
+end