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隣の API のデータを Rails らしく、しなやかに扱う / Handling next-...
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osyoyu
October 22, 2022
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隣の API のデータを Rails らしく、しなやかに扱う / Handling next-door API data in Rails
osyoyu
October 22, 2022
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Transcript
Daisuke Aritomo (@osyoyu) / Kaigi on Rails 2022 ྡͷ API
ͷσʔλΛ Rails Β͘͠ɺ͠ͳ͔ʹѻ͏
@osyoyu Ͱ͢ • ΫοΫύουͰຖ Rails Λॻ͍ͯ·͢ • ී௨ͷ Ruby ͕͖
• ISUCON Ͱ Ruby Λ༏উ͍ͤͨ͞
ྡͷ API ͷσʔλΛ Rails Β͘͠ɺ͠ͳ͔ʹѻ͏
API ΞΫηεͳ͠ͰαʔϏεΛ࡞Εͣ ୭͕ API αʔόʔͱΫϥΠΞϯτͷ྆ํΛ࡞Δ େ API ࣌
API αʔόʔΛ࡞Δͱ͖ ϓϥΫςΟεཱ͕֬͞Ε͍ͯΔ
ҰํɺΫϥΠΞϯτΛ࡞Δͱ͖
ҰํɺΫϥΠΞϯτΛ࡞Δͱ͖
ҰํɺΫϥΠΞϯτΛ࡞Δͱ͖ API ΫϥΠΞϯτͷ࡞Γํ ඞͣ͠ཧ͞Ε͍ͯͳ͍
ྡͷ API ͷσʔλΛ Rails Β͘͠ɺ͠ͳ͔ʹѻ͏ ͍͍ײ͡ͷ API ΫϥΠΞϯτͷ࡞Γ͔ͨ
ʮ͍͍ײ͡ͷ API ΫϥΠΞϯτͷ࡞Γํʯ ΫοΫύουͰ͋Γ͕ͪͳࡐΛྫʹ έʔεελσΟͯ͠ΈΑ͏
ͲͷΑ͏ͳ Ruby ΠϯλʔϑΣʔεʹ͢Δ͔ʁ Ϩγϐίϯςετͷ microservice ͷྫ User (MySQL) Recipe
Contest (MySQL) Recipe (API) Recipe ContestEntry (MySQL) N 1 N 1 N 1 1 1
• ҟͳΔιʔεछผͷ en ti ty ҟͳΔऔಘํࣜΛఏڙ͢Δ • MySQL
༝དྷ AR::Base Λ ܧঝ͢ΔΫϥεͰදݱ • ֎෦༝དྷผͷΫϥεͰදݱ (i.e. AR::Base Λܧঝ͠ͳ͍) (1) ιʔεͷछผʹண͢Δ User (MySQL) Recipe Contest (MySQL) Recipe (API) Recipe ContestEntry (MySQL) N 1 N 1 N 1 1 1
None
has_one ૉʹදݱͰ͖ͦ͏
belongs_to Ͱ N+1 ʹͳΓ͕ͪ has_one ૉʹදݱͰ͖ͦ͏ has_manyͱ belongs_toͷෳ߹
(1) ιʔεͷछผʹண͢Δ ੑ࣭͕ҟͳΔ (DB/API) σʔλ͕֤ʑʹదͨ͠ߏΛͭ ϓϩάϥϜͷڍಈΛ૾͍͢͠ 👍 JOIN ؔ࿈
(associa ti on) Λදݱ͢Δͷʹແཧ͕ੜ͡Δ 🤔
• ಉҰͷυϝΠϯͷ en ti ty ಉҰͷऔಘํ๏Λఏڙ͢Δ • ΞϓϦͷυϝΠϯ্ͳΒ
ͯ͢ Ac ti veRecord-like ͳ औಘํࣜΛఏڙ͢Δ (2) υϝΠϯڥքʹண͢Δ Tweet (API) User (MySQL) Recipe Contest (MySQL) Recipe (API) Recipe ContestEntry (MySQL) 1 N 1 N 1 1
ਓྨͷྺ࢙: ActiveResource, Her, ... • Ac ti veResource • RESTful
API Λ͍͍ײ͡ʹ model ͬΆͯ͘͘͠ΕΔ • Rails 3.2 ·Ͱͷඪ४ػೳͩͬͨ • Her • ͜Εಉ͡Α͏ͳతͷ Gem • ΄͔ʹ Ac ti veRestClient, Spyke, Flexirest ͳͲ͕͋Δ
ਓྨͷྺ࢙: ActiveResource, Her, ... • ͜ΕΒ "Res tf ul API"
Λେલఏʹ͓͍͍ͯΔ • ಛఆͷ URL ߏΛٻΊΒΕΔ • ͬͺΓ JOIN ͦ͜·ͰಘҙͰͳ͍
(2) υϝΠϯڥքʹண͢Δ ؔ࿈͢ΔσʔλʹಉҰͷૢ࡞ମܥͰΞΫηεͰ͖Δ ʹ σʔλͷར༻͕ࣗવͳܗͰهड़Ͱ͖Δ 👍 ຊདྷҟͳΔૢ࡞ΛಉҰͷૢ࡞ʹݟ͔͚͍ͤͯΔͷͰ ࣮ʹແཧ͕ग़͖͕ͯͪ 🤔
(2) υϝΠϯڥքʹண͢Δ ؔ࿈͢ΔσʔλʹಉҰͷૢ࡞ମܥͰΞΫηεͰ͖Δ ʹ σʔλͷར༻͕ࣗવͳܗͰهड़Ͱ͖Δ 👍 ຊདྷҟͳΔૢ࡞ΛಉҰͷૢ࡞ʹݟ͔͚͍ͤͯΔͷͰ ࣮ʹແཧ͕ग़͖͕ͯͪ 🤔
👊👊 ࣮ͰΓӽ͑Εղܾ 👊👊
ͭͬͯ͘ΈΑ͏ʂ
AR ෩ API ΫϥΠΞϯτΛͭͬͯ͘ΈΑ͏ • ֎෦ API ͕ఏڙ͢Δ Recipe ʹ͍ͭͯ
• Recipe. fi nd(1) ͷΑ͏ͳܗͰΫΤϦͰ͖Δ • @recipe. ti tle ͷΑ͏ͳܗͰϑΟʔϧυΛಡΊΔ • Ϧιʔεαʔόʔʹಛఆͷߏ (RESTful) Λཁٻ͠ͳ͍ • JOIN (has_many, belongs_to, ...) ͏·͘͜ͳͤΔ • Α͏ͳʢجຊతͳʣͷΛͭͬͯ͘ΈΑ͏
ͨͱ͑ AR ෩ʹ͢Δ߹Ͱ͋ͬͯɺτϥϯεϙʔτ͖͢ ϦτϥΠॲཧͳͲ͍ͨ͠͠ɺgRPC ҠߦͳͲָʹͳΔ ·ͣૢ࡞తͳΫϥΠΞϯτΛ༻ҙ Level 1
ͦΕΛͬͯ Recipe.find ͰϦΫΤετ Level 1 ҰԠ has_one తͳϝιου ΫΤϦ༻ͷϝιου (
fi nd, where) recipe# ti tle ͳͲͰϑΟʔϧυΞΫηε
Controller Ͱผݸʹॲཧ͢ΕճආՄೳͰ͋Δ͕…… includes(:recipes) ͷΑ͏ʹهड़͍ͨ͠ ͕͢͞ʹ·࣮ͩ༻త͡Όͳ͍͔ User Recipe Contest Recipe
Recipe ContestEntry recipes (API) ΛԿϦΫΤετͯ͠͠·͏😔ɹɹɹɹ
• Recipe. fi nd ͷ෦ͰΩϡʔΠϯά͢Δ • Recipe. fi nd ͔Βͻͱ·ͣ
Promise తͳΦϒδΣΫτ͕ฦΔ • exAspArk/batch-loader Λར༻ • Recipe. fi nd ͷฦΓʹରͯ͠ # ti tle ͳͲΛݺͿͱɺอཹ͞Ε͍ͯͨϦΫΤετ͕·ͱΊͯඈͿ BatchLoader Ͱ eager loading ͢Δ Level 2
has_one :recipe Ͱهड़͍ͨ͠…… has_many :recipes Ͱهड़͍ͨ͠……
API ຊͷ ActiveRecord ʹͪ͠Ό͏ Level 3 • ຊͷ Ac ti
veRecord Ϋϥεʹͯ͠͠·͏ ͜ͱͰ has_many, belongs_to ͳͲ͕͑Δ • ͜ͷٕΛ͑Δ͔ෆม݅࣍ୈ • ͜͜Ͱ "recipe.user_id ͕ෆมͰ͋Δ" • (͔ͭ recipe.user_id ͕ FK Ͱ͋Δ͜ͱ) • ෆม݅ͷ෦͚ͩςʔϒϧʹೖΕΔ
• ݸਓతʹ AR ෩Ͱͳ͘ɺͬͱૢ࡞తͳܗ͕ྑ͍ͱࢥ͏ • APIClient.update(id: 1, {name: "nanika"}) •
τϥϯβΫγϣϯ͕ඞཁͳΒ1ͭͷDBͷ౷߹Λߟ͑Δ͖ • ΫϥΠΞϯτͷߏʹؔͳ͘ɺ͞ΜτϥϯβΫγϣϯࠔ ͱ͜ΖͰߋ৽ɾআʁ Others
མͪึͻΖ͍ɾࡉ͔͍ Others • AR ෩ͷΦϒδΣΫτΛ༻ҙ͢ΔʹͤΑɺescape hatch ༻ҙͨ͠΄͏͕͍͍ • Ac ti
veModel::Model ʹ͍ͭͯ • ͓ΈͰ include ͢ΔͱΑ͍Ͱ͠ΐ͏ • valida ti on callbacks, rou ti ng ͳͲʹؔ࿈͢Δαϙʔτ͕͍͖ͭͯ·͢ • cookpad/expeditor ͰߋͳΔߴԽΛૂ͏
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