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GoとGAEによるWebアプリケーション開発(Go Con 2016 Spring)
Tatsuya Tsuruoka
April 23, 2016
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GoとGAEによるWebアプリケーション開発(Go Con 2016 Spring)
2016年4月23日の Go Conference 2016 Spring の発表資料です。
Tatsuya Tsuruoka
April 23, 2016
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Transcript
(Pͱ("&ʹΑΔ 8FCΞϓϦέʔγϣϯ։ൃ 2016/04/23
ࣗݾհ 2 • גࣜձࣾικ ˍ גࣜձࣾϝϧΧϦ • ٕज़తͳҙࢥܾఆͱνʔϜ࡞Γ͕ࣄͰ͢ !UUTVSVPLB Ԭ
ୡ
ࠓճ͓͍͑ͨ͜͠ͱ 3 1. Google App Engine / Go Ͱ ݱ࣮తͳ
Web ΞϓϦΛ։ൃ͠ɺӡ༻͍ͯ͘͜͠ͱ͕Ͱ͖Δ 2. ͦͯ͠ Go ʹΑΔ Web ΞϓϦ։ൃ͕ɺ ࠓޙ·͢·͋ͨ͢Γ·͑ʹͳ͍ͬͯ͘
INDEX Why Google App Engineʁ εέʔϥϏϦςΟʢΩϡʔͱӬଓԽʣ ϩάੳͱӡ༻
Why GAE? - GAE ͱ 5 • GAE Web
ΞϓϦͷͨΊͷ PaaS • ༷ʑͳ։ൃݴޠʹରԠ͓ͯ͠Γ Go ͦͷ͏ͪͷͻͱͭ • ࣮ݱͰ͖Δ͜ͱ • ۃΊͯߴ͍εέʔϥϏϦςΟ • req/sec ेສreq/sec ಉ͡Α͏ʹѻ͑Δ • Google ϨϕϧͷՄ༻ੑ • োʹΑͬͯαʔϏε͕ఀࢭ͢Δ͜ͱك • ϝϯςφϯεϑϦʔ • ࠷ॳʹΞʔΩςΫνϟΛܾΊΕ͋ͱ͏ख͕͔͔Βͳ͍
Why GAE? - GAE ͱ 6 • ࣮ࡍʹ GAE ͰͲΜͳ
Web ΞϓϦΛ࡞͍͚ͬͯΔʁ • ࣄྫɿSnapchatɺIngress • ผͷར༻Ϣʔβ͕1ԯਓΛ͑Δنͷ࣮͕ɺ͢Ͱʹ͋Δ ※ͨͩ͠ݴޠ Go Ͱͳ͍ͱࢥΘΕ·͢ • ϝϧΧϦࢠձࣾͷ৽نࣄۀʮϝϧΧϦ Ξοςʯ GAE Λ࠷େݶʹར༻ • ΠϯϑϥΤϯδχΞ 0 ਓ • ϦϦʔε͔Βͷ1ϲ݄ؒʹٸܹͳΞΫηε૿ͳͲͰࠔͬͨ͜ͱҰͳ͠ • μϯλΠϜθϩɻܭըఀࢭͳ͠ • → ݱ࣮తͳ Web ΞϓϦΛ࡞ΔͨΊͷػೳඋΘ͍ͬͯΔ
Why GAE? 7 • ࠓճɺGAE ͷػೳΛհ͢ΔͨΊʹ Web ΞϓϦΛߟ͑ͯΈΔ • ྫ͑ɺ͍·Γ্͕͍ͬͯΔ
Bot ΞϓϦ 4݄7 LINE BOT API ެ։ɺ4݄13 Facebook bots on Messenger ެ։ • → ͜ͷ Bot ΞϓϦΛ GAE ͰϋΠεέʔϥϒϧʹ࡞Δͱͨ͠Β...
εέʔϥϏϦςΟʢΩϡʔͱӬଓԽʣ
εέʔϥϏϦςΟ - ୯७ͳ Bot 9 • ػೳɿ • νϟοταʔόʢ͜ͷྫͰLINEʣ͔Β ίʔϧόοΫΛड͚औΓɺ
ϢʔβͷϝοηʔδͳͲΛऔಘͰ͖Δ • ϝοηʔδΛݩʹԿΒ͔ͷॲཧΛͯ͠ɺ Ϣʔβʹฦ৴Ͱ͖Δ
εέʔϥϏϦςΟ - ୯७ͳ Bot 10 • ίʔϧόοΫΛϋϯυϦϯά͢Δ func init() {
http.HandleFunc("/line/callback", receiveLine) } func receiveLine(w http.ResponseWriter, r *http.Request) { ... } • func init GAE/Go ΞϓϦͷཪଆ͔ΒݺΕΔॏཁͳؔ • func receiveLine ͷதͰૹΒΕͯ͘ΔϝοηʔδΛॲཧͯ͠ฦ৴ͨ͠Γ͢Δ
εέʔϥϏϦςΟ - ୯७ͳ Bot 11 • ͜ΕΛσϓϩΠ͢Δ͚ͩͰ… ʢ͍͔ͭ͘՝͋Δͷͷʣεέʔϥϒϧͳ Bot ͕Ͱ͖͕͋Γ
• ͜ͷ࣌ͷεέʔϥϏϦςΟɿ • ༑ୡ͕͍ͳ͍ͱ͖ → Πϯελϯεىಈ͍ͯ͠ͳ͍ • ༑ୡ͕૿͑ͨΓϝοηʔδ͕ૹΒΕͯ͘ΔͱίʔϧόοΫ͕ୟ͔ΕΔ → ༑ୡͷ૿͑ํϝοηʔδͷྲྀྔʹ߹ΘͤͯΠϯελϯε͕ࣗಈͰ૿ݮ • Πϯελϯεͷىಈेʙ200msͳͷͰऔΓ͜΅͠ͳ͠ • Πϯελϯεͷىಈ࣮࣌ؒݴޠʹΑͬͯҟͳΔ • ͪΖΜ Go ͕࠷
εέʔϥϏϦςΟ - ୯७ͳ Bot 12 • ՝ɿ • ͻͱͭͷϦΫΤετΛॲཧ͢Δͷʹ͕͔͔࣌ؒͬͯ͠·͏ͱ͖ •
GAE ଆɿϦΫΤετ60ඵͰλΠϜΞτ͢Δ • LINE BOT ଆɿ 1ϦΫΤετ10ඵͰλΠϜΞτ͢Δ • → ίʔϧόοΫͷडͱͦͷޙͷॲཧΛඇಉظʹ͢Δඞཁ͋Γ • աڈͷϝοηʔδͷΓͱΓͱൺͯฦ৴Λ͍ͨ͠ • → աڈͷΓͱΓΛอଘͯ͠ࢀরͰ͖Δඞཁ͋Γ
εέʔϥϏϦςΟ - Task Queue 13 • ΩϡʔΛͬͯඇಉظʹॲཧ͢Δ • GAE Ͱ
Task Queue ͱ͍͏ػೳ͕ ఏڙ͞Ε͍ͯΔ プロジェクト App Engine App Engine Datastore Instances Search BigQuery Task Queue - GCE - Logs etc. - Networks
εέʔϥϏϦςΟ - Task Queue 14 • Task Queue ͷ Push
Queue Λ͏ • ͖Ίࡉ͔͍࣮ߦ੍ޚ͕؆୯ʹͰ͖Δ • Ұఆ࣌ؒʹॲཧ͢ΔλεΫͷʢྫɿຖඵ100݅ɺຖ࣌50݅ʣ • ಉ࣌ʹॲཧ͢ΔλεΫͷ੍ݶɺࣦഊ࣌ͷ࠶࣮ߦ੍ޚͳͲ • ؆୯ͳઃఆϑΝΠϧʹΩϡʔΛఆٛ͢Δ total_storage_limit: 1T queue: - name: received-messages rate: 100/s RVFVFZBNM
εέʔϥϏϦςΟ - Task Queue 15 • enqueue ͷํ๏ɿλεΫΛ࡞ͬͯΩϡʔʹՃ͢Δ • λεΫʹॲཧઌͱϖΠϩʔυΛࢦఆ
t := taskqueue.NewPOSTTask("/worker/reply-message", url.Values{...}) resultTask, err := taskqueue.Add(ctx, t, "received-message") if err != nil { return err } • dequeue ͷํ๏ɿ • Ωϡʔͷઃఆʹͱ͍ͮͯλεΫ͕ॲཧ͞Ε͍ͯ͘ • ্ͷ߹ POST ϦΫΤετͰ /worker/reply-message ͕ୟ͔ΕΔ • → λεΫ୯७ͳ HTTP ϦΫΤετʹͳΔ
εέʔϥϏϦςΟ - Task Queue 16
εέʔϥϏϦςΟ - ӬଓԽ 17 • ՝ɿաڈͷϝοηʔδͷΓͱΓͱൺͯฦ৴Λ͍ͨ͠ • → աڈͷΓͱΓΛอଘͯ͠ࢀরͰ͖Δඞཁ͋Γ •
NoSQL σʔλϕʔεʮDatastoreʯΛ͏ • ΩʔʹΑΔ CRUD • ෳ߹ΠϯσοΫε • ʢ੍ଟΊͷʣτϥϯβΫγϣϯ • ΫΤϦͳͲ
εέʔϥϏϦςΟ - ӬଓԽ 18 type Message struct { Id int64
SenderId int64 Sender *User `datastore:"-"` Text string Unread bool Location Location CreatedTime time.Time } type Location struct { Lat float64 Lng float64 } • Datastore ʹอଘ͢ΔΤϯςΟςΟΛ ఆٛ͢Δ • ͍ͨͬͯී௨ͷߏମ • datastore λά͕͍͍ͯΔ • อଘ࣌ͷ໊લมߋ • อଘ͢Δ͔Ͳ͏͔ • ୯ҰߦΠϯσοΫεΛ͚Δ͔
εέʔϥϏϦςΟ - ӬଓԽ 19 key := datastore.NewKey(ctx, "Message", "", msg.Id,
nil) if _, err := datastore.Put(ctx, key, msg); err != nil { return err } • ϝοηʔδͷอଘ *% 4FOEFS*E 5FYU 6OSFBE -PDBUJPO-BU -PDBUJPO-OH $SFBUFE5JNF ͜Μʹͪ 536& ͓ෲ͍ͨ͢ '"-4&
εέʔϥϏϦςΟ - ӬଓԽ 20 • ϝοηʔδͷऔಘ key := datastore.NewKey(c, "Message",
"", id, nil) if err := datastore.Get(c, key, &msg); err != nil { return nil, err } q := datastore.NewQuery("Message") q = q.Filter("SenderId =", senderId).Order("-CreatedTime").Limit(10) var msgs []Message _, err := q.GetAll(c, &msgs) • ΫΤϦ
εέʔϥϏϦςΟ - Datastore ͷಛ 21 • Pros • ۃΊͯߴ͍εέʔϥϏϦςΟ •
ӬଓԽͰ͖ΔσʔλʢΤϯςΟςΟʣͷʹ੍ݶͳ͍ • ӬଓԽσʔλ͕ͲΕ͚ͩ૿͑ͯऔಘͱՃͷྼԽ͠ͳ͍ • 1݅Ͱ10ԯ݅Ͱಉ͡ • ಉҰΤϯςΟςΟͰͳ͚Ε੍ݶͳ͠ͷฒྻॻ͖ࠐΈ • ۃΊͯߴ͍Մ༻ੑ • μϯλΠϜͳ͠ • Cons • BigTable ΑΓߴػೳͱ͍͑ϓϦϛςΟϒ • ݶఆ͞Εͨ݅Ͱ͔͠ ACID τϥϯβΫγϣϯ͕αϙʔτ͞Εͳ͍ • JOIN ͕ͳ͍ɺू͕ؔͳ͍ɺetc.
ϩάੳͱӡ༻
ϩάੳͱӡ༻ 23 • Web ΞϓϦΛެ։͢Εɺ ͦͷΞΫηεϩάΛݟͨΓɺ༷ʑͳσʔλੳΛ͢Δඞཁ͋Δ • Web ΞϓϦ͕ਖ਼ৗʹಈ͍͍ͯΔͷ͔Ͳ͏͔ࢹ͍ͨ͠ •
→ ͪΖΜ GAEʢGCPʣ͚ͩͰରԠՄೳ
౷߹͞Ε͍ͯΔϦΞϧλΠϜͷϩάػೳ 24
౷߹͞Ε͍ͯΔϦΞϧλΠϜͷϩάػೳ - τϨʔε 25
౷߹͞Ε͍ͯΔϦΞϧλΠϜͷϩάػೳ - τϨʔε 26
౷߹͞Ε͍ͯΔϦΞϧλΠϜͷϩάػೳ - τϨʔε 27
ϩάੳͱӡ༻ 28 • ϦΫΤετʹͻ͍ͨΞϓϦέʔγϣϯϩάΛग़ྗ͢Δ log.Infof(ctx, "Read Message: id=%v", ids[i])
log.Warningf(ctx, "missing Message entity: id=%v, err=%v", ids[i], err) ͦͷ··ϩάϏϡʔϫʹग़ྗ͞ΕΔ #JH2VFSZͷϦΞϧλΠϜૠೖ ઃఆϘλϯΛԡ͚ͩ͢
ϩάੳͱӡ༻ 29 ϩάͷݕࡧ݅Λࢦఆ ϑΟϧλ໊Λ͚Δ
ϩάੳͱӡ༻ 30 • ࡞ͬͨϩάϑΟϧλΛͬͯɺ ݅Λ࡞ɻ ͖͍͠Λ͑ͨΒΞϥʔτ ʢϝʔϧɺSlack ͳͲ௨ʣ
·ͱΊ 31 1. Google App Engine / Go Ͱ ݱ࣮తͳ
Web ΞϓϦΛ։ൃ͠ɺӡ༻͍ͯ͘͜͠ͱ͕Ͱ͖Δ 2. ͦͯ͠ Go ʹΑΔ Web ΞϓϦ։ൃ͕ɺ ࠓޙ·͢·͋ͨ͢Γ·͑ʹͳ͍ͬͯ͘