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range over funcの使い道と非同期N+1リゾルバーの夢 / about a ran...
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mackee
December 13, 2024
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range over funcの使い道と非同期N+1リゾルバーの夢 / about a range over func
kamakura.go #7
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December 13, 2024
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Transcript
range over funcͷ͍ಓͱ ඇಉظN+1Ϧκϧόʔͷເ @mackee_w
Δਓ • X: @mackee_w • GitHub: @mackee • ໘ന๏ਓΧϠοΫ •
όοΫΤϯυ & SRE • ࠷ۙRAGύΠϓϥΠϯͳͲΛࢼ࡞ ͍ͯ͠·͢
range over func͓͞Β͍ + ͍ಓ
Go 1.23 Release NotesΑΓ
ͬ͘͟Γ range over ** Go language specΑΓ
ͬ͘͟Γrange over func • for range … ͷ … ʹೖΕΒΕΔͭͰɺҙͷڍಈΛ͢Δ͕ͭ࡞ΕΔΑ͏
ʹͳΓ·ͨ͠Α • ݴޠઃܭଆͷҙਤ: ෮ॲཧͷҰൠԽ͞Εͨॲཧύλʔϯɺͭ·ΓΠςϨʔ λʔΛݴޠػೳͱͯ͠ΈࠐΜͩ • *database/sql.Rows *bu fi o.ScannerͳͲΠςϨʔλʔΛಠࣗʹ࣮͠ ͍ͯΔ(ͦͯͦ͠ΕͧΕΠϯλʔϑΣΠε͕ҧ͏) • ͜ΕΒΛେ౷Ұ͢Δҙਤ͕͋ΔͷͰͳ͍͔(ཁग़య)
ͬ͘͟Γ͍ํ
iter.Seqࣗ࡞ͯ͠ྑ͍ • ҙͷྻจࣈྻΛϧʔϓ͝ͱʹ ੜ͠ଓ͚Δ܅࡞ΕΔ • ଞͷrange over **ͱҧ͍ɺແݶʹ Λు͖ग़͢ͷ࡞ΕΔ •
👉ͷྻΛՃ͍ͯͯ͠͠Δ
օ͞Μ͕͙͢ʹ͑Δศརؔ slices.Chunk
iter.Seqผʹfor rangeͰΘͳͯ͘ྑ͍ • iter.Seq slices.Collect ͰεϥΠεʹมͰ͖Δ • ແݶʹΛుͭ͘ऴΘΒͳ͍ͷͰҙ •
εϥΠεͷΑ͏ͳσʔλྻΛදݱ͢ΔσʔλΛ͞ΒʹநԽͨ͠ܕͱݴ͑Δ • github.com/BooleanCat/go-functional/v2/it ʹศརϢʔςΟϦςΟ͕ؔ͋Δ • ͍ΘΏΔ github.com/samber/lo ͷ iter.Seq/iter.Seq2൛ • it.Map/it.Map2, it.Filter/it.Filter2 ͳͲ • x/exp/xiter ύοέʔδʹಉछͷ͕ؔೖΔ͜ͱ͕ٞ͞Ε͍ͯΔ
ࠓ·Ͱͷ + ͬͱதͷ͕ҎԼͷεϥΠυ ʹ͋Δ • Go Conference 2024: ΠςϨʔλʹΑͬͯGoͲ͏มΘΔͷ͔ •
https://gocon.jp/2024/sessions/2/
TIPS: օ͞Μ͕͙͢ʹ͑Δศརؔ slices.Chunk • sliceΛׂͯ͠ෳݸͷsliceΛฦ͢iter.Seq[[]E]Λ࡞Δ • Ͳ͏͍͏໘ʹศར͔ʁ => όϧΫͰॲཧ͍͕ͨ͠ɺҰؾʹΓ͗͢ Δͷྑ͘ͳ͍࣌
• SQLͰIN۟Λ༻͍ͨόϧΫऔಘ • Ұʹ͛ΒΕΔID͕nݸʹ੍ݶ͞Ε͍ͯΔόϧΫऔಘAPI
ඇಉظN+1Ϧκϧόʔͷເ
N+1 • ιγϟήͷྫ: users ςʔϒϧʹ user_weapons(උث) ςʔϒϧ͕ has-many Ͱ ͍͍ͭͯΔɻҰཡͰuserͱඋثΛηοτͰग़͍ͨ͠
• φΠʔϒͳ࣮: SELECT * FROM users WHERE … • ্هͰҾͬு͖ͬͯͨ݁ՌΛߦ͝ͱʹSELECT * FROM user_weapons WHERE user_id = ? • usersͷߦ͝ͱʹSQL͕ൃߦ͞Εͯ͠·͏ͨΊɺRDBMS·Ͱͷ௨৴Φʔόʔϔο υɺSQLύʔείετɺͳͲͳͲ͕ੵΈॏͳΓϨεϙϯελΠϜ͕ྼԽ͢Δ
GraphQLN+1͕ຊ࣭తʹى͜Γ͕ͪ • GraphQLͰɺ͋Δϊʔυʹඥͮ͘ࢠڙͷϊʔυΛऔΔΑ͏ͳΫΤϦΛΫϥΠ Ξϯτ͕ಈతʹΈཱͯͯൃߦ͢Δ͜ͱ͕Ͱ͖Δ • ී௨ʹφΠʔϒʹ࣮͢ΔͱN+1͕ൃੜ͢Δʂ • ͦ͜ͰGraphQLքͰdataloaderͱ͍͏ςΫ͕·͍ͬͯΔ • GoͷdataloaderͰɺϊʔυͷղܾΛඇಉظʹ͢Δ
+ छྨ͝ͱͷϊʔυͷղ ܾϦΫΤετΛόοϑΝϦϯάͯ͠όϧΫͰॲཧ͢Δ • dataloaderʹ͍ͬͯΕ΄ͱΜͲͷN+1͍͍ײ͡ʹղܾ͞ΕΔ
ҰํRESTfulͷN+1ղܾํ๏ • ϨεϙϯεͷΈཱͯํϑϨʔϜϫʔΫͰͳ͘ΞϓϦέʔγϣϯ ίʔυͷ • => dataloaderͷΑ͏ʹఆܕԽͰ͖ͳ͍ • ΄ͱΜͲͷέʔεͰεϥΠεΛฦ͢ͱ͖ʹಉظతʹεϥΠεͷதΛ ॱ൪ʹΈཱͯͯߦ͍ͬͯΔͷͰdataloaderͷద༻Ͱ͖ͳ͍
• => εϥΠεͷղܾΛඇಉظʹ͢Εྑ͍ͷͰʁ
github.com/mackee/iterutils/async.Map • go-functional/v2/it.Mapͷඇಉظ൛ • async.Map2͋ΔΑʂ • ͜ΕͰεϥΠεͷࢠͷϊʔυͷղܾΛdataloaderʹͤΔ͜ͱ͕Ͱ ͖ΔͷͰͳ͍͔
͍ํ
sync.WaitGroupͰࣄΓΔͷͰʁ • ҧ͍ͱͯ͠ɺॏͶ͕͚͕Մೳ • async.MapiterΛड͚ೖΕΔ ͭ·Γit.Mapasync.MapΛෳճ ֻ͚߹ΘͤΔ͜ͱ͕Ͱ͖Δ • ॲཧͷ࣮ߦࣗମɺslices.Collect ͞ΕΔ·ͰԆ͞ΕΔ
• ͪͳΈʹॱ൪ೖΕͨiter.Seqͷॱ൪ʹྻͯ͠ฦ͢Α͏ʹͳͬͯ ͍·͢
async.Map2ͷ͍ํ • errgroup.Groupʹ૬ • iter.Seq2[V, error] Λฦ͢ • it.TryCollectiter.Seq2[V, error]Λ৯ͯͲΕ͔ҰͭͰ
error͕͋Εଧͪͬͯ errorΛฦ͢
github.com/vikstrous/dataloadgen • GoͰdataloaderΛߦ͏ͭ • GenericsΛ͍ͬͯΔͷ Ͱੜ͠ͳͯ͘ศར(ର vektah/dataloaden)
࣮ࡍૣ͘ͳΔ͔ݕূͯ͠ΈΔ • ӈਤͷςʔϒϧΛ༻ҙ • fi xtureΛೖΕͨ users: 10000, items: 10000
user_items: 100000 • ϥϯμϜͰ500݅IDࢦఆͨ͠users ΛऔΓɺ͞Βʹ͍࣋ͬͯΔitemΛ ͱΔૢ࡞ • FkΠϯσοΫεష͍ͬͯͳ͍
N+1͕͋Δঢ়ଶͷίʔυ
Dataloaderʹͨ͠ͱ͖ͷಉ༷ͷίʔυ
Dataloaderʹͨ͠ͱ͖ͷಉ༷ͷίʔυ
ϕϯν݁Ռ 100ഒۙ͘ͷ͕͍ࠩͭͨ
ͦͷଞͷߟ • ࣮ISUCONͷաڈͰͬͯείΞ͕ͦΜͳʹ্͕Βͳ͍ • ਪଌ: CPU/ϝϞϦ੍͕ݶ͞Ε͍ͯͨΓ͢Δ͔Βʁ • ͔ͳΓgoroutineΛىಈ͢ΔͨΊʁ • ͔࣮͠͠ࡍͷݱͰgqlgen/dataloader͕ػೳ͍ͯ͠ΔҎ্ɺ͜ͷ
ख๏༗ޮͦ͏ͱݴ͑Δ • (͕͜͜λΠτϧͷʮເʯཁૉͰ͢)
·ͱΊ • GraphQLͰͳ͍໘ͰdataloaderΛ͏߹ʹɺasync.Map/ async.Map2͕༻Ͱ͖Δ͜ͱΛࣔͨ͠ • ͦͯ͋͠ΔఔޮՌతͰ͋Δ͜ͱ͕Θ͔ͬͨ • async.Map/dataloaderΛ͏ͱطଘͷσʔλΈཱͯͷߏ͔Β͋ ·Γม͑ͳͯ͘ྑ͍ͷͰϦϑΝΫλʹศར •
AΛݺͿͷʹBͷmap͕ඞཁΈ͍ͨͳґଘؔݮΒͤΔ
Ҏ্Ͱ͢ʂ • ͦͷଞ͓Βͤ: gitHub.com/mackee/iterutils ʹطଘͷΠςϨʔλͬ Ά͍interfaceΛiter.Seqʹม͢Δ͕ؔ͋ΔͷͰݟͯ͘Εʂ