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ちょっとわかるrack
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Leonard Chin
May 24, 2012
Programming
10
1.2k
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
Leonard Chin
May 24, 2012
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Transcript
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call(env)
def call(env) ... end 3FRVFTUΛ͞ΕΔ 3FTQPOTFΛฦ͢ [status, headers, response_body]
ৄࡉ41&$Ͱ http://rack.rubyforge.org/doc/SPEC.html
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# 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
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rackup config.ru ΞϓϦͷೖΓޱΛఆٛ Rack::Builder.new { <config.ru> }.to_app ʹ͢
#config.ru require ‘rack’ require ‘myapp’ run MyApp.new 3BDL"QQMJDBUJPO JFJNQMFNFOUTcall(env)
# Minimum config.ru require ‘rack’ run lambda { |env| [200,
{ "Content-Type" => "text/plain" }, ["OK"] ] } TUBUVT IFBEFST CPEZ
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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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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··࣍
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#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 3BDL෦Ͱ!VTFྻʹૠೖ 3BDL#VJMEFSʹCJOE͞ΕͯΔ