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Firestore Ͱ CQRS ΍ͬͯΈͨ Firebase Meetup #13 @DeNA

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Kinjo Yuji iOS Engineer Twitter: @_yukin01 GitHub: @yukin01

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ɾσʔλϞσϦϯά͕೉͍͠ͱ͍͏࿩ ɾ࣮ࡍʹ΍ͬͯΈΔ ɾCQRS ͕࢖͑Δ͔΋͠Εͳ͍ ɾ·ͱΊ ͜Μͳ࿩Λ͠·͢

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ϦϨʔγϣϯγοϓͲ͏දݱ͍ͯ͠·͔͢ʁ

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Top-level Collection or Sub Collection collection("posts") .where("room_id", "==", "room_001") .orderBy("createdAt", "desc") collection("rooms") .doc("room_001") .collection("posts") .orderBy("createdAt", "desc") Top-level collection Sub collection

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Sub collection Map (Array) or Sub Collection

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͍ΖΜͳཁૉͰܾ·ͬͯ͘Δʢઈରղ͸ͳ͍ ɾଟॏ౓ => 1 : 1, 1 : n, n : n ɾ਌ࢠυΩϡϝϯτͷϥΠϑαΠΫϧ ɾΫΤϦ ɾॻ͖ࠐΈͷ੍ݶ document => 1 times/s collection => 500 times/s ɾetc.

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Firestore ͰͰ͖Δ͜ͱࣗମ૿͍͑ͯΔ ɾarrayUnion/array-contains ɾincrement ɾCollection Group ʢΩϟονΞοϓେมʣ

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࠷ۙࢥ͏͜ͱ ϢʔεέʔεʢͲ͏͍͏σʔλΛऔಘɾߋ৽͍͔ͨ͠ʣ ʹΑͬͯ ࠷దͳσʔλߏ଄͕ܾ·Δʢ࠷దղ͸͋Δ => ߏ଄ʹΑͬͯ͸σʔλͷऔಘɾߋ৽͕ ඇৗʹ೉͘͠ͳΔ͜ͱ΋…

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νϟοτػೳͷσʔλߏ଄Λߟ͑Δ

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͜Μͳײ͡

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Contents - ϧʔϜ໊ - ΞΠίϯը૾ - ϝϯόʔ਺ - ະಡ਺ - ࠷৽ϝοηʔδ Conditions - ॴଐ͍ͯ͠ΔϧʔϜͷΈ - ౤ߘ࣌ؒͰιʔτ

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Contents - ϧʔϜ໊ - ΞΠίϯը૾ - ϝϯόʔ਺ - ະಡ਺ - ࠷৽ϝοηʔδ Conditions - ॴଐ͍ͯ͠ΔϧʔϜͷΈ - ౤ߘ࣌ؒͰιʔτ

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Contents - ϧʔϜ໊ - ΞΠίϯը૾ - ϝϯόʔ਺ - ະಡ਺ - ࠷৽ϝοηʔδ Conditions - ॴଐ͍ͯ͠ΔϧʔϜͷΈ - ౤ߘ࣌ؒͰιʔτ

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Contents - ϧʔϜ໊ - ΞΠίϯը૾ - ϝϯόʔ਺ - ະಡ਺ - ࠷৽ϝοηʔδ Conditions - ॴଐ͍ͯ͠ΔϧʔϜͷΈ - ౤ߘ࣌ؒͰιʔτ

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Contents - ϧʔϜ໊ - ΞΠίϯը૾ - ϝϯόʔ਺ - ະಡ਺ - ࠷৽ϝοηʔδ Conditions - ॴଐ͍ͯ͠ΔϧʔϜͷΈ - ౤ߘ࣌ؒͰιʔτ

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Contents - ϧʔϜ໊ - ΞΠίϯը૾ - ϝϯόʔ਺ - ະಡ਺ - ࠷৽ϝοηʔδ Conditions - ॴଐ͍ͯ͠ΔϧʔϜͷΈ - ౤ߘ࣌ؒͰιʔτ

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·ͣ͸γϯϓϧʹ

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ɾϧʔϜ໊ɺ ΞΠίϯը૾ɺ ϝϯόʔ਺ ɾarray-contains ͷΫΤϦ ɾະಡ਺Ͳ͏͢Δ…ʁ

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ɾະಡ਺ ࠷৽ϝοηʔδ ɾཁ݅͸ຬͨͤΔ ɾWrite ͷ੍ݶ͕…" (unreadCount ʹूத͢Δ)

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ɾSub Collection Խ ɾཁ݅͸ຬͨͤΔ ɾ1ճͷΫΤϦͰ औಘͰ͖ͳ͍ Rooms => Members => Messages

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ɾJOIN ͢Δύλʔϯ ɾਖ਼نԽ ɾΫϥΠΞϯταΠυ JOIN ɾ͍ΘΏΔ N+1 ໰୊ ʢઈରμϝͱ͍͏Θ͚Ͱ͸ͳ͍ʣ ɾJOIN ͠ͳ͍ύλʔϯ ɾඇਖ਼نԽ ɾඞཁͳσʔλΛ৑௕Խʢίϐʔʣ͢Δ ɾRDB Ͱ͸ߟ͑ʹ͍͕͘ NoSQL Ͱ͸Ұൠత

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ɾJOIN ͢Δύλʔϯ ɾਖ਼نԽ ɾΫϥΠΞϯταΠυ JOIN ɾ͍ΘΏΔ N+1 ໰୊ ʢઈରμϝͱ͍͏Θ͚Ͱ͸ͳ͍ʣ ɾJOIN ͠ͳ͍ύλʔϯ ɾඇਖ਼نԽ ɾඞཁͳσʔλΛ৑௕Խʢίϐʔʣ͢Δ ɾRDB Ͱ͸ߟ͑ʹ͍͕͘ NoSQL Ͱ͸Ұൠత <= ࠾༻ͯ͠ΈΔ

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ඇਖ਼نԽʢίϐʔʣͷ࣮ݱํ๏ ɾTransaction or Batch Write ɾAtomic ͳॻ͖ࠐΈΛ࣮ݱ ɾ࠷େ 500 ݅ͷ੍ݶ͋Γ ɾFirestore Trigger ɾ݁Ռ੔߹ੑ ɾΤϥʔॲཧɺϦτϥΠॲཧͷඞཁੑ

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͚ͩ͜͜ݟΕ͹ྑ͍

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Trigger functions

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Trigger functions

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Trigger functions

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Batch Write

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ϐλΰϥεΠον

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CQRS (Command Query Responsibility Segregation) Command (ߋ৽ܥ) ͱ Query (ࢀরܥ) ͰػೳΛ෼ׂ DDD ͷจ຺ͰޠΒΕΔ͜ͱ͕ଟ͍ ES (Event Sourcing) ʮঢ়ଶʯͰ͸ͳ͘ʮΠϕϯτʯΛه࿥͍ͯ͘͠ߟ͑ํ ೚ҙͷঢ়ଶ͸ΠϕϯτΛ࠶ੜ͢Ε͹࠶ݱͰ͖Δ CQRS ͱ૊Έ߹ΘͤͰΑ͘ޠΒΕ͍ͯΔ

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h"ps://www.slideshare.net/AmazonWebServices/ srv301op=mizing-serverless-applica=on-data-=ers-with-amazon-dynamodb

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https://www.slideshare.net/AmazonWebServices/ srv301optimizing-serverless-application-data-tiers-with-amazon-dynamodb

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Command ଆ͸Πϕϯτ͚ͩΛه࿥ (ཁ͸Create ͷΈ) => ׬ᘳʹ࣮ݱ͢Δͷ͸΍Ί͓ͯ͘ σʔλͷྲྀΕΛҰํ޲ʹ͢Δͱ͜ΖΛऔΓೖΕΔ

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͜͏͍͏Πϝʔδ

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ɾਖ਼نԽ ɾηΩϡϦςΟϧʔϧͰ Write ͷΈڐՄ ɾ΄΅ RDB ͷײ֮

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ɾඇਖ਼نԽ ɾηΩϡϦςΟϧʔϧͰ Read ͷΈڐՄ ɾΫϥΠΞϯτͷॲཧָ͕ ɾཁ݅มߋʹରԠ͠΍͍͢

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Trigger functions Command -> Query ͷҰํ޲

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·ͱΊ - Firestore + Functions Ͱ CQRS ΛऔΓೖΕͨ σʔλϞσϦϯάΛ࣮૷ - Command ͱ Query Ͱ׬શʹ෼཭ - ϐλΰϥεΠονΛҰํ޲ʹͰ͖Δ - ͕ - ঢ়ଶ͕ଟ͘ɺRead ͕සൟͳϢʔεέʔεͰ͸ ༗ޮ͔΋