1.
About Clack Hatena Co., Ltd. Eitarow Fukamachi Oct 24, 2012 International Lisp Conference @ Kyoto, Japan

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About Me• Eitarow FUKAMACHI (≒ eight arrow)• Live in Kyoto, Japan• Common Lisp user since 2010• Attended ILC2010 @ Reno• (I’m using Clozure CL)• Web application developer at Hatena Co., Ltd.• Using Perl at work

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Products• Clack • CL-Markup• Caveman • CL-Project• ningle • Shelly• CL-TEST-MORE etc.• CL-DBI See github.com/fukamachi

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What’s “Clack”?

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What’s Clack?• Web application environment • Foundation for Web application framework• Equivalent to... • Python’s WSGI, Ruby’s Rack, Perl’s Plack/PSGI and Clojure’s Ring

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What’s Clack?• Web application environment • Foundation for Web application framework• Equivalent to... • Python’s WSGI, Ruby’s Rack, Perl’s Plack/PSGI and Clojure’s Ring• Abstract HTTP into a simple API (Portability)• Share code across web frameworks (Reusability)

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Clack’s“Portability”

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“Portability”• Abstract a web server ※Application includes Web frameworks.

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“Portability”• Abstract a web server ※Application includes Web frameworks.

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“Portability”(clack:clackup app);-> Hunchentoot server is started.; Listening on localhost:5000.; # #x30200A102B3D

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“Portability”(clack:clackup app);-> Hunchentoot server is started.; Listening on localhost:5000.; # #x30200A102B3D(clack:clackup app :server :hunchentoot) ;; default(clack:clackup app :server :fcgi)(clack:clackup app :server :apache)

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Clack’s“Reusability”

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“Reusability”• Application takes Request and returns Response

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“Reusability”• Application takes Request and returns Response• Extension mechanism called “Middleware”• “Middleware” can be reused

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“Show me how to use it!”

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Example 1“Hello, World!”

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Example: Hello, World!(defun app (env) (declare (ignore env)) (200 (:content-type "text/plain") ("Hello, World!")))(clack:clackup #app)

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Example: Hello, World!(defun app (env) (declare (ignore env)) (200 ‘(200 (:content-type "text/plain") “text/plain”) ("Hello, World!"))) (“Hello, World!”))(clack:clackup #app)

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Example: Hello, World! (defun app (env) (declare (ignore env)) (200 ‘(200(:request-method :GET :script-name "" (:content-type "text/plain") “text/plain”) :path-info "/sns/member" ("Hello, World!"))) (“Hello, World!”)) :query-string "id=3":server-name "localhost":server-port 5000 (clack:clackup #app):request-uri "/sns/member?id=3":server-protocol :HTTP/1.1:http-user-agent "Mozilla/5.0 (Macintosh...":remote-addr "127.0.0.1":remote-port 26077:http-referer nil:http-host "localhost:5000":http-cookies nil)

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Example: Hello, World!

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Example 2“Conditional flow”

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Example: Conditional flow(defun app (env) (cond ((string= (getf env :path-info) "/favicon.ico") (200 (:content-type "image/x-icon") #p"/path/to/favicon.ico")) ((string= (getf env :path-info) "/") (200 (:content-type "text/html") ("Hello again"))) (t (404 (:content-type "text/plain") ("Not found")))))(clack:clackup #app)

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Example 3“Basic Auth”

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Example: Basic Auth(import ‘(clack.builder:builder clack.middleware.auth.basic:<clack-middleware-auth-basic>))(defun app (env) (declare (ignore env)) (200 (:content-type "text/plain") ("Hello, World!")))(clack:clackup (builder (<clack-middleware-auth-basic> :authenticator (lambda (user pass) (and (string= user "johnmccarthy") (string= password "password")))) #app))

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Example: Basic Auth

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Example 4“Static files”

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Example: Static files(import ‘(clack.builder:builder clack.middleware.static:<clack-middleware-static>))(defun app (req) (declare (ignore req)) (200 (:content-type "text/plain") ("Hello, World!")))(clack:clackup (builder (<clack-middleware-static> :path (lambda (path) (when (ppcre:scan "^/(?:images|css|js)/" path) (ppcre:regex-replace "^/[^/]+" path ""))) :root #p"static/") #app))

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What are the benefits of using Clack?

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Clack allows you to:• If you’re a “Web framework developer”... • Clack provides server interfaces. • Reuse code from other web frameworks.

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Clack allows you to:• If you’re a “Web framework developer”... • Clack provides server interfaces. • Reuse code from other web frameworks.• If you’re a “Web application engineer”... • Reuse code in your projects • Extensible

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Frameworks

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Frameworks• Caveman • A Sinatra-like micro framework• ningle • A really micro framework

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Frameworks• Caveman (fukamachi.github.com/caveman/) • A Sinatra-like micro framework• ningle (fukamachi.github.com/ningle/) • A really micro framework

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Future Work

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Future Work• More Middlewares• More Servers • non-blocking web server? • preforking web server?

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Future Work• More Middlewares• More Servers • non-blocking web server? • preforking web server?• More Frameworks • Ruby on Rails?

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THE ENDThank you for listening

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Maybe we still have time. Any questions in easy English? To Japanese speakers: Please translate a question for me if it looks I dont understand it. 僕が質問を理解できていなさそうだったら翻訳してください＞＜