ちょっとわかるrack

初心者向けrackの簡単な紹介
・rackとは何か
・rackアプリの作り方
・rack middlewareの作り方・使い方

※2012/5/14の会社内LTで使用した資料

Transcript

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6. call(env)
7. def call(env) ... end 3FRVFTUΛ౉͞ΕΔ 3FTQPOTFΛฦ͢ [status, headers, response_body]
8. ৄࡉ͸41&$Ͱ http://rack.rubyforge.org/doc/SPEC.html
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10. # Rack call interface. def call(env) dup.call!(env) end attr_accessor :env, :request, :response, :params def call!(env) # :nodoc: @env = env @request = Request.new(env) @response = Response.new @params = indifferent_params(@request.params) template_cache.clear if settings.reload_templates force_encoding(@params) @response['Content-Type'] = nil invoke { dispatch! } invoke { error_block!(response.status) } unless @response['Content-Type'] if Array === body and body[0].respond_to? :content_type content_type body[0].content_type else content_type :html end end @response.finish end
11. SBDLVQ
12. rackup config.ru ΞϓϦͷೖΓޱΛఆٛ Rack::Builder.new { <config.ru> }.to_app ʹ౉͢
13. #config.ru require ‘rack’ require ‘myapp’ run MyApp.new 3BDL
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14. # Minimum config.ru require ‘rack’ run lambda { |env| [200, { "Content-Type" => "text/plain" }, ["OK"] ] } TUBUVT IFBEFST CPEZ
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18. class Middleware def initialize(app) @app = app end def call(env) # do something response = @app.call(env) # do something end end ࣍ʹݺͿ"QQ.JEEMFXBSF 3FRVFTUΛ͍͡Δ 3FTQPOTFΛ͍͡Δ
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20. def call(env) unless env['rack.session'] raise SessionUnavailable.new('Rack::Csrf depends on session middleware') end self.class.token(env) req = Rack::Request.new(env) untouchable = skip_checking(req) || !@http_methods.include?(req.request_method) || req.params[self.class.field] == env['rack.session'][self.class.key] || req.env[self.class.rackified_header] == env['rack.session'][self.class.key] if untouchable @app.call(env) else raise InvalidCsrfToken if @raisable [403, {'Content-Type' => 'text/html', 'Content-Length' => '0'}, []] end end $43'νΣοΫࣦഊͨ͠Βɺ ͙͢ʹ3FTQPOTFฦ͢ 3FRVFTUʹ$43'ରࡦUPLFOΛνΣοΫ ௨ͬͨΒɺͦͷ··࣍΁
21. 6TJOH
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22. #config.ru require ‘rack’ require ‘myapp’ class Middleware def initialize(app) @app = app end def call(env) env["rack.some_header"] = "setting an example" @app.call(env) end end use Middleware run MyApp.new 3BDL಺෦Ͱ!VTF഑ྻʹૠೖ 3BDL#VJMEFSʹCJOE͞ΕͯΔ