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Firestore で CQRS やってみた
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Yuji Kinjo
May 28, 2019
Technology
22
4.9k
Firestore で CQRS やってみた
Yuji Kinjo
May 28, 2019
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Transcript
Firestore Ͱ CQRS ͬͯΈͨ Firebase Meetup #13 @DeNA
Kinjo Yuji iOS Engineer Twitter: @_yukin01 GitHub: @yukin01
ɾσʔλϞσϦϯά͕͍͠ͱ͍͏ ɾ࣮ࡍʹͬͯΈΔ ɾCQRS ͕͑Δ͔͠Εͳ͍ ɾ·ͱΊ ͜ΜͳΛ͠·͢
ϦϨʔγϣϯγοϓͲ͏දݱ͍ͯ͠·͔͢ʁ
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
Sub collection Map (Array) or Sub Collection
͍ΖΜͳཁૉͰܾ·ͬͯ͘Δʢઈରղͳ͍ ɾଟॏ => 1 : 1, 1 : n, n
: n ɾࢠυΩϡϝϯτͷϥΠϑαΠΫϧ ɾΫΤϦ ɾॻ͖ࠐΈͷ੍ݶ document => 1 times/s collection => 500 times/s ɾetc.
Firestore ͰͰ͖Δ͜ͱࣗମ૿͍͑ͯΔ ɾarrayUnion/array-contains ɾincrement ɾCollection Group ʢΩϟονΞοϓେมʣ
࠷ۙࢥ͏͜ͱ ϢʔεέʔεʢͲ͏͍͏σʔλΛऔಘɾߋ৽͍͔ͨ͠ʣ ʹΑͬͯ ࠷దͳσʔλߏ͕ܾ·Δʢ࠷దղ͋Δ => ߏʹΑͬͯσʔλͷऔಘɾߋ৽͕ ඇৗʹ͘͠ͳΔ͜ͱ…
νϟοτػೳͷσʔλߏΛߟ͑Δ
͜Μͳײ͡
Contents - ϧʔϜ໊ - ΞΠίϯը૾ - ϝϯόʔ - ະಡ -
࠷৽ϝοηʔδ Conditions - ॴଐ͍ͯ͠ΔϧʔϜͷΈ - ߘ࣌ؒͰιʔτ
Contents - ϧʔϜ໊ - ΞΠίϯը૾ - ϝϯόʔ - ະಡ -
࠷৽ϝοηʔδ Conditions - ॴଐ͍ͯ͠ΔϧʔϜͷΈ - ߘ࣌ؒͰιʔτ
Contents - ϧʔϜ໊ - ΞΠίϯը૾ - ϝϯόʔ - ະಡ -
࠷৽ϝοηʔδ Conditions - ॴଐ͍ͯ͠ΔϧʔϜͷΈ - ߘ࣌ؒͰιʔτ
Contents - ϧʔϜ໊ - ΞΠίϯը૾ - ϝϯόʔ - ະಡ -
࠷৽ϝοηʔδ Conditions - ॴଐ͍ͯ͠ΔϧʔϜͷΈ - ߘ࣌ؒͰιʔτ
Contents - ϧʔϜ໊ - ΞΠίϯը૾ - ϝϯόʔ - ະಡ -
࠷৽ϝοηʔδ Conditions - ॴଐ͍ͯ͠ΔϧʔϜͷΈ - ߘ࣌ؒͰιʔτ
Contents - ϧʔϜ໊ - ΞΠίϯը૾ - ϝϯόʔ - ະಡ -
࠷৽ϝοηʔδ Conditions - ॴଐ͍ͯ͠ΔϧʔϜͷΈ - ߘ࣌ؒͰιʔτ
·ͣγϯϓϧʹ
ɾϧʔϜ໊ɺ ΞΠίϯը૾ɺ ϝϯόʔ ɾarray-contains ͷΫΤϦ ɾະಡͲ͏͢Δ…ʁ
ɾະಡ ࠷৽ϝοηʔδ ɾཁ݅ຬͨͤΔ ɾWrite ͷ੍ݶ͕…" (unreadCount ʹूத͢Δ)
ɾSub Collection Խ ɾཁ݅ຬͨͤΔ ɾ1ճͷΫΤϦͰ औಘͰ͖ͳ͍ Rooms => Members =>
Messages
ɾJOIN ͢Δύλʔϯ ɾਖ਼نԽ ɾΫϥΠΞϯταΠυ JOIN ɾ͍ΘΏΔ N+1 ʢઈରμϝͱ͍͏Θ͚Ͱͳ͍ʣ ɾJOIN
͠ͳ͍ύλʔϯ ɾඇਖ਼نԽ ɾඞཁͳσʔλΛԽʢίϐʔʣ͢Δ ɾRDB Ͱߟ͑ʹ͍͕͘ NoSQL ͰҰൠత
ɾJOIN ͢Δύλʔϯ ɾਖ਼نԽ ɾΫϥΠΞϯταΠυ JOIN ɾ͍ΘΏΔ N+1 ʢઈରμϝͱ͍͏Θ͚Ͱͳ͍ʣ ɾJOIN
͠ͳ͍ύλʔϯ ɾඇਖ਼نԽ ɾඞཁͳσʔλΛԽʢίϐʔʣ͢Δ ɾRDB Ͱߟ͑ʹ͍͕͘ NoSQL ͰҰൠత <= ࠾༻ͯ͠ΈΔ
ඇਖ਼نԽʢίϐʔʣͷ࣮ݱํ๏ ɾTransaction or Batch Write ɾAtomic ͳॻ͖ࠐΈΛ࣮ݱ ɾ࠷େ 500 ݅ͷ੍ݶ͋Γ
ɾFirestore Trigger ɾ݁Ռ߹ੑ ɾΤϥʔॲཧɺϦτϥΠॲཧͷඞཁੑ
None
͚ͩ͜͜ݟΕྑ͍
Trigger functions
Trigger functions
Trigger functions
Batch Write
ϐλΰϥεΠον
CQRS (Command Query Responsibility Segregation) Command (ߋ৽ܥ) ͱ Query (ࢀরܥ)
ͰػೳΛׂ DDD ͷจ຺ͰޠΒΕΔ͜ͱ͕ଟ͍ ES (Event Sourcing) ʮঢ়ଶʯͰͳ͘ʮΠϕϯτʯΛه͍ͯ͘͠ߟ͑ํ ҙͷঢ়ଶΠϕϯτΛ࠶ੜ͢Ε࠶ݱͰ͖Δ CQRS ͱΈ߹ΘͤͰΑ͘ޠΒΕ͍ͯΔ
h"ps://www.slideshare.net/AmazonWebServices/ srv301op=mizing-serverless-applica=on-data-=ers-with-amazon-dynamodb
https://www.slideshare.net/AmazonWebServices/ srv301optimizing-serverless-application-data-tiers-with-amazon-dynamodb
Command ଆΠϕϯτ͚ͩΛه (ཁCreate ͷΈ) => ᘳʹ࣮ݱ͢ΔͷΊ͓ͯ͘ σʔλͷྲྀΕΛҰํʹ͢Δͱ͜ΖΛऔΓೖΕΔ
͜͏͍͏Πϝʔδ
None
ɾਖ਼نԽ ɾηΩϡϦςΟϧʔϧͰ Write ͷΈڐՄ ɾ΄΅ RDB ͷײ֮
ɾඇਖ਼نԽ ɾηΩϡϦςΟϧʔϧͰ Read ͷΈڐՄ ɾΫϥΠΞϯτͷॲཧָ͕ ɾཁ݅มߋʹରԠ͍͢͠
Trigger functions Command -> Query ͷҰํ
·ͱΊ - Firestore + Functions Ͱ CQRS ΛऔΓೖΕͨ σʔλϞσϦϯάΛ࣮ -
Command ͱ Query Ͱશʹ - ϐλΰϥεΠονΛҰํʹͰ͖Δ - ͕ - ঢ়ଶ͕ଟ͘ɺRead ͕සൟͳϢʔεέʔεͰ ༗ޮ͔