Scotty + Aeson + Persistentで作るJSON Web API

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Scotty + Aeson + PersistentͰ࡞ΔJSON Web API גࣜձࣾAiming ౻ଜେհ @ Yesodษڧձୈ2ճ, 2012-07-07

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ࣗݾ঺հ • ౻ଜେհ • http://fujimuradaisuke.com @ffu_ • גࣜձࣾAimingॴଐ • Haskell޷͖ͷRuby on RailsϓϩάϥϚʔ • ࠷ۙ͸JavaScript/CoffeeScript΋Α͘ॻ͍͍ͯΔ • ΞδΞͷྉཧͱΞϝϦΧͷϏʔϧɺΞϧβεͷϫΠϯ͕޷͖ • ϥςϯΞϝϦΧจֶ΋޷͖

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ͱ͜ΖͰɺͳͥࠓJSON Web APIͳͷ͔ • ͳΜ͔ͩ࠷ۙJSON Web APIΛ࡞Δػձ͕ଟ͍ • ҰͭͷΞϓϦέʔγϣϯΛෳ਺ΫϥΠΞϯτͰಈ͔͢ࣄྫ͕૿͖͑ͯͨ • Mobile, PC, iOS/Android Nativeશ෦ʹల։ͱ͔ • ϑϩϯτΤϯυͰUIΛߏங͢Δٕज़ͷൃୡɾਁಁ • ΫϥΠΞϯτɾαʔόʔͷ෼ۀ͸ਐΈͦ͏

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ಥવͰ͕͢Yesod͸͍·͍ͪͩͱࢥ͏ • ࠷ۙWebσβΠϯ/ϑϩϯτΤϯυ։ൃ͕Ұஈͱ೉͘͠ͳ͖ͬͯͨؾ͕͢Δ • ͳͷͰΫϥΠΞϯτʗαʔόʔͰ෼ۀ͕Ͱ͖ͳ͍ͱݫ͍͠ • Έͳ͞ΜHamletͱCassiusͰϓϩμΫγϣϯϨϕϧͷϨεϙϯγϒͳϚʔΫ ΞοϓͰ͖·͔͢ʁ • Α͏΍͘sass/less͕ਁಁ͖ͯͨ͠ͷʹ·ͨ৽͍ٕ͠ज़Λ… • ͔͠΋΄ͱΜͲҰॹͩ͠… • Web APIͱͯ͠࢖͏ͱͳΔͱϑϧελοΫͷ౓͕ա͗Δ • ͳͥ࢖͏༧ఆͷͳ͍ೝূϥΠϒϥϦͷΠϯετʔϧΛٻΊΒΕΔͷ͔

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ͦ͜ͰWeb API͸scottyͰ࡞Ζ͏Ͱ͸ͳ͍͔ • Web API࡞Γ͸DBΞΫηεͱϧʔςΟϯά͑͞Ͱ͖Ε͹جຊOK • ྫ͑͹RubyͩͱWeb API࡞Δ࣌RailsͰ͸ͳ͘sinatraͬͯͷ͸Α͋͘Δ • ϥΠϒϥϦͷґଘؔ܎͸গͳ͍΄͏͕Կ͔ͱ޾ͤ • DB͸persistentɺJSON͸aesonͰ΍ͬͯΈΑ͏

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scottyʹ͍ͭͯ • RubyͷsinatraΠϯεύΠΞͷWeb Application Framework • https://github.com/xich/scotty/ • γϯϓϧͳAPI • Yesodͱಉ͘͡waiϕʔε

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aesonʹ͍ͭͯ • Real World HaskellͷஶऀɺBryan O'Sullivan͞Μͷ࡞ͬͨJSONϥΠϒϥϦ • https://github.com/bos/aeson • ·ΔͰJSONͷΑ͏ͳߏจͰॻ͚ΔDSL(?)͕େมศར • ଎͍Β͍͠

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persistentʹ͍ͭͯ • ͝ଘ஌YesodಉࠝͷORM • (͔͠͠ɺ”Object”ʹϚοϐϯά͞ΕͯΔؾ഑͸શ͘ແ͍ʣ • http://www.yesodweb.com/book/persistent • PostgreSQL, SQLite, MongoDB, MySQLʹରԠ • QuasiQuoteͰςʔϒϧఆٛɺϚΠάϨʔγϣϯ΋͋Δ • ܕνΣοΫ෇͖ͷSQLͬͯײ͡Ͱ࢖͍΍͍͢

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Ͱ͖·ͨ͠ • ݁࿦͔Βݴ͏ͱͱͯ΋޾ͤͳ૊Έ߹ΘͤͰͨ͠

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persistentͱaesonͷ૬ੑ͕͢͹Β͔ͬͨ͠(1) • ςʔϒϧఆٛͨ͠ΒɺͦΕΛToJSON/FromJSONͷΠϯελϯεʹ͢Δ

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persistentͱaesonͷ૬ੑ͕͢͹Β͔ͬͨ͠(2) • ͢ΔͱɺDBͷߦΛJSONͱͯ͠ѻ͑Δ(ToJSONͷΠϯελϯεʹͳΔͷͰʣ • ͳͷͰɺscottyͰͦͷ··JSONϨεϙϯεͱͯ͠ฦͤΔ

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persistentͱaesonͷ૬ੑ͕͢͹Β͔ͬͨ͠(3) • ࠓ౓͸ςʔϒϧͱಉ͡εΩʔϚͷJSONΛPOST͢Δͱɺ • ͦͷ··ߦͱͯ͠DBʹೖΕΒΕΔʢFromJSONͷߦͱͯ͠ड͚औΕΔ͔Βʣ

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͜Ε͸͔ͳΓΤϨΨϯτͳͷͰ͸ • ͜ͷهड़ྔͰDB͔Βͷऔಘ/DB΁ͷ௥Ճ͕Ͱ͖·͢ • ͍͢͝ʂ

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ΩϥʔϥΠϒϥϦͷ༧ײ • ґଘؔ܎͕গͳ͍ͷͰίϯύΠϧ΋ָ • ܕΫϥεΛ׆͔ͤΔ • Web APIͳΒHaskellͰ΋ΫϥΠΞϯτ։ൃͱͷڠಇ΋໰୊ͳ͠ • Ή͠ΖϥϯλΠϜΤϥʔ͕ແ͍ͷͰΫϥΠΞϯτ։ൃ͸޾ͤ

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༨ஊ • ͪͳΈʹҐஔ৘ใܥͷWebαʔϏεΛ࡞Ζ͏ͱͯ͠·ͨ͠ • ΫϥΠΞϯτ͸Backbone.js, CoffeeScriptɺGoogle Maps͋ͨΓΛར༻ • ࣮ࡍͷͱ͜ΖɺΫϥΠΞϯτͷίʔυΛॻ͍ͯΔํ͕௕͔ͬͨ… • HTMLςϯϓϨʔτ͸mustacheΛ࢖ͬͨɻ͜Ε΋ྑ͔ͬͨ • ·ͩෳࡶͳ͜ͱΛ΍ͬͯͳ͍ͷͰɺམͱ͕݀͋͠Γͦ͏ • ೝূ·ΘΓ͸·ͩະணखɻམͱ݀͠͸͔͜͜…ʁ • Template HaskellΛ࢖ͬͨΒToJSON/FromJSONʹ͢Δͷ΋ࣗಈͰͰ͖ͦ͏ͳ ؾ͕…

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͓ΘΓ • ιʔείʔυ https://github.com/fujimura/spot • ͝ਗ਼ௌ͋Γ͕ͱ͏͍͟͝·ͨ͠ʂ