Scala Fukuoka Play 25 2016

Play Framework 2.5 でつくる Web アプリケーション

Transcript

1. Play Framework 2.5 Ͱͭ͘Δ Web ΞϓϦέʔγϣϯ Tsuyoshi Yoshizawa @ussy00
3. Play + Scala ܦݧྺ • Java Λத৺ʹडୗҊ݅ • ओʹ Seasar2 ϑϨʔϜϫʔΫ • Play 2.0 ͔Βຊ֨తʹ Scala Λ৮Δ • ͍͍ͩͨ 4 ೥͙Β͍ • αʔϏεΛͭ͘Δͱ͖ʹબఆ • ຊӡ༻ظؒ͸ 2 ೥
4. Play + Scala ΛબΜͩཧ༝ • Java 8 ͸·ͩͳ͘ Scala ʹڵຯ • ίϨΫγϣϯ API ͕ศརͩͬͨ • Option ͕ॳΊ͔Β૊Έࠐ·Ε͍ͯͨ • ؆ܿͳίʔυʹͰ͖Δ • Java ࢿ࢈ʢϥΠϒϥϦʣ͕ར༻Ͱ͖Δ • ॻ͍ͯΈָ͔ͯͬͨ͠
5. Play Framework makes it easy to build web applications with Java & Scala. Play is based on a lightweight, stateless, web-friendly architecture.
6. RESTful GET /users/:id controllers.UserController.find(id: Long) class UserController extends Controller { def find(id: Long) = Action { implicit request => User.findById(id).map { user => Ok(Json.obj( “id” -> user.id, “name” -> user.name )) }.getOrElse { NotFound(Json.obj( “message” -> “User not found” )) } } } routes UserController.scala
7. εςʔτϨε • ηογϣϯ৘ใ͸ ΫϥΠΞϯταΠυ (Cookie) ʹจࣈྻΛอ࣋ • ΩʔΛݩʹ DB/Ehcache/Redis ͳͲʹ อଘ͢Δ • HMAC-SHA1 ʹΑΔॺ໊ • play.crypto.secret ҉߸伴ͷΩʔ (application.conf)
8. ϦόʔεϧʔςΟϯά GET /users/:id controllers.UserController.find(id: Long) POST /users/create controllers.UserController.create class UserController extends Controller { def create = Action { implicit request => // ࡞੒ॲཧ val user = ??? Redirect(routes.UserController.find(user.id)) } } • ίϯύΠϧνΣοΫʹΑΔ҆৺ײ • ύϥϝʔλʔɺ URL มߋ΁ͷࣗಈ௥ਵ <a href=“@routes.UserController.find(user.id)”>@user.name</a> view
9. ςϯϓϨʔτΤϯδϯ (twirl) @(customer: Customer, orders: List[Order]) <h1>Welcome @customer.name!</h1> <ul> @for(order <- orders) { <li>@order.title</li> } </ul> • ίϯύΠϧνΣοΫʹΑΔ҆৺ײ • Scala ه๏Ͱهड़ view
10. HTTP ϦΫΤετϋϯυϦϯά case class UserData(name: String, age: Int) val userForm = Form( mapping( "name" -> nonEmptyText, "age" -> number(min = 0, max = 100) )(UserData.apply)(UserData.unapply) ) • ύϥϝʔλʔͷܕ߹Θͤ΋ίϯύΠϧνΣοΫ • content-type ʹΑΔϋϯυϦϯάରԠ • application/x-www-form-urlencoded • application/json
11. Play ෇ଐϥΠϒϥϦ • Web ΞϓϦΛ࡞੒͢Δ্Ͱ࠷௿ݶͷ ϥΠϒϥϦ͕෇ଐ͍ͯ͠Δ • Play JSON • Play WS • HTTP client • OAuth client • Play Filters (CSRF, CORS …)
12. Dependency Injection • JSR 330 ඪ४࢓༷ʹ४ڌ • ίϯετϥΫλΠϯδΣΫγϣϯਪ঑ • Play 2.4 ͔Βಋೖ import javax.inject.Inject import play.api.libs.ws._ class MyComponent @Inject()(wsClient: WSClient) { def request(url: String) = { wsClient.url(url).get() … } }
13. ࣮૷੾Γସ͑ྫ • trait (interface) ʹΑΔ։ൃ؀ڥ/ຊ൪؀ ڥͷ࣮૷੾Γସ͑΋ίʔυͰදݱ class MyModule(environment: Environment, configuration: Configuration) extends AbstractModule { override def configure() = { configuration.getString("storage.type") match { case Some(t) if t == "local" => bind(classOf[StorageService]).to(classOf[LocalStorageService]) case Some(t) if t == "s3" => bind(classOf[StorageService]).to(classOf[S3StorageService]) case t => sys.error(s"The storage type is not supported: $t") } } }
14. ࠃࡍԽରԠ (i18n) • ϝοηʔδϦιʔε͸ conf/messages ϑΝΠϧʹ key=value ܗࣜͰهड़ • ϩέʔϧΛ֦ுࢠʹ෇Ճͯ͠ෳ਺ݴޠ ରԠ • conf/messages.ja-JP • conf/messages.fr play.i18n.langs=[“en-US”,"ja-JP", “fr”]
15. ࠃࡍԽରԠྫ import javax.inject.Inject import play.api.i18n.I18nSupport class UserController @Inject()(val messagesApi: MessagesApi) extends Controller with I18nSupport { def hello = Action { implicit request => Ok(Json.obj( “text” -> Messages(“hello”) )) } } hello=Hello Scala! hello=͜Μʹͪ͸ Scala! messages.ja-JP messages
16. ࠃࡍԽରԠϫϯϙΠϯτ • ݴޠͷద༻͸ΫϥΠΞϯτ৘ใ͔Β 1. Cookie (PLAY_LANG) 2. AcceptLanguage (HTTP Header) • MessagesApi#setLang Ͱ Cookie ʹ൓ө Lang(Locale.JAPAN) Lang.get(“ja-JP”).getOrElse(Lang.defaultLang)
17. ͕͍͍͜͜Α Play Framework
18. Hot reloading • ίϯςφ࠶ىಈͳ͠ʹίʔυ൓ө • sbt ʹΑΔࠩ෼ίϯύΠϧ • Ϋϥεϩʔμʔࠩ͠ସ͑ • ։ൃϞʔυͰ͸σϑΥϧτͰ༗ޮ • dev/prod/test Ϟʔυ
19. Evolutions • SQL ͰϑΝΠϧʹΞοϓάϨʔυ/μ΢ ϯάϨʔυΛهड़ • Scala ͰϩδοΫ͸هड़Ͱ͖ͳ͍ • HTTP ϦΫΤετ࣌ʹݕ஌ • ։ൃऀͷ DB Λࣗಈతʹ౷ҰͰ͖Δ
20. ϚΠάϨʔγϣϯ࣮ߦྫ
21. ϚΠάϨʔγϣϯϒϥϯνઓུ
22. ϚΠάϨʔγϣϯϝϦοτ • ϑΟʔνϟʔϒϥϯν։ൃͱ૬ੑ͕Α͍ • ϒϥϯνؒͷҠಈ͕͠΍͍͢ • try&error ͕͠΍͍͢ • ϑΝΠϧ໊͸࿈൪Ͱ؅ཧ (n.sql) • Ϛʔδ͢Δͱ͖ʹίϯϑϦΫτΛى͜ ͤ͞ɺϚΠάϨʔγϣϯॱΛݻఆ
23. ϚΠάϨʔγϣϯຊ൪؀ڥྫ • ຊ൪؀ڥͰ͸ແޮʹ͍ͯ͠Δ • खಈͰΦϯϥΠϯεΩʔϚมߋରԠ͢ ΔͨΊ෼ׂ࣮ͯ͠ߦ͢Δέʔε͋Γ • σʔλ݅਺ɺϩοΫͷҧ͍ʹ஫ҙ play.evolutions.enabled=false
24. ଞͷϚΠάϨʔγϣϯπʔϧ • Play Evolutions ͕ഽʹ߹Θͳ͍ • ίϚϯυϥΠϯ͔Βద༻͍ͨ͠ • Java(Scala) ͰϚΠάϨʔγϣϯ͍ͨ͠ • Flyway ͕͓͢͢Ί • https://github.com/flyway/flyway- play
25. Typesafe config db { default { driver = org.postgresql.Driver } } • Java ϥΠϒϥϦ Scala ϥούʔ • HOCON ܗࣜ (JSON Superset) • ઃఆϑΝΠϧΛ include Ͱ͖Δʢ্ॻ͖ʣ • application.conf -> prod.conf -> beta.conf
26. ͕͍͍͜͜Α Play ·ͱΊ • RESTful ϑϨʔϜϫʔΫ • εέʔϧΞ΢τ͠΍͍͢ • ա৒ͳ·Ͱͷܕ҆શ • Ξϊςʔγϣϯ΋΄΅ͳ͘ॻ͍ͯ͋Δ ͱ͓Γʹಈ҆͘৺ײ • ࢼ͠ͳ͕Β։ൃΛਐΊ͍͚ͯΔ
27. ͕͜͜ϋϚΔΑ Play Framework
28. Scala ඇಉظॲཧ import scala.concurrent.ExecutionContext.Implicits.global Future { // Some blocking or expensive code here } • Future Λ࢖͏͜ͱͰɺॲཧΛඇಉظԽ ͢Δ͜ͱ͕Ͱ͖Δ • CPU ίΞ਺෼ಉ࣌ʹॲཧ • Java8 CompletableFuture తͳ΋ͷ
29. Play Scala ඇಉظॲཧ import play.api.libs.concurrent.Execution.Implicits._ • Future Λ࢖͏ • import ઌΛมߋ͢Δ͜ͱ • Play ͸σϑΥϧτ 24 ݸ·ͰͷϦΫΤε τΛฒྻͰड͚औΔ • Thread Pool ͕ރׇ͢Δͱ৽نϦΫΤε τ͕଴ͪঢ়ଶʹͳΔ
30. σϑΥϧτεϨουϓʔϧௐ੔ akka { actor { default-dispatcher = { fork-join-executor { parallelism-min = 100 parallelism-max = 100 } } } } • ϦϦʔεલʹඞͣνϡʔχϯά • DB ࠷େ઀ଓ਺Λ֬ೝ
31. Netty Play Request Default thread pool Other thread pool Play
32. ผεϨουϓʔϧ࡞੒ contexts { http { fork-join-executor { parallelism-factor = 20.0 parallelism-max = 200 } } } val executionContext = akkaSystem.dispatchers.lookup(“contexts.http”) Future { // Some blocking or expensive code here }(executionContext)
33. • ద੾ʹεϨουϓʔϧΛఆٛ͠ύϑΥʔ Ϛϯενϡʔχϯά • DB ࠷େ઀ଓ਺΋֬ೝ • εϨουΛա৴͗ͣ͢͠ SQS ͳͲͷ ϝοηʔδΩϡʔ΋ߟྀ Play εϨουϓʔϧ·ͱΊ https://www.playframework.com/documentation/ 2.5.x/ThreadPools
34. ORM • Slick • Lightbender ࣾʹΑΔ ORM • Slick 3.0 ͔ΒඇಉظΞΫηεΛਪ঑ • ScalikeJDBC • ૉ௚ʹ͔͚ͯେ͖ͳϋϚϦͳ͠ • جຊతʹ SQL Ͱهड़͢Δ։ൃʹ • νϡʔχϯά͍͔ͨ͠Β
35. ϦόʔεϓϩΩγ໰୊ play { http { forwarded.trustedProxies=[“10.0.0.0/8”, "::1", “127.0.0.1"] } } • Nginx ͳͲϦόʔεϓϩΩγΛஔ͍ͯ IP ΞυϨεΛऔಘ͍ͨ͠ • ৴པ͢Δ Private ωοτϫʔΫΛࢦఆ
36. Assets ύϑΥʔϚϯε໰୊ • ϦΫΤετ͝ͱʹεϨουফඅ • ϦϦʔεϏϧυ࣌ʹ S3 (cloudfront) ʹ Ξοϓϩʔυ͢ΔεΫϦϓτࣗ࡞ • CDN Λར༻͠ϦΫΤετΛࡹ͔ͳ͍
37. Play ৘ใपΓ • Stackoverflow ͕ୈೋͷυΩϡϝϯτ • ೔ຊޠपΓ • Blog ౳͸ݹ͘ͳΓ͕ͪ • ༗ࢤͷํʑʹΑΔຊՈ຋༁ • https://gitter.im/scalajp/public • @scalajp_gitter (twitter)
38. ͕͜͜ବ໨ͩΑ Play Framework
39. ίϯύΠϧ଎౓໰୊ • Scala ͓໿ଋ໰୊ • View/Routing ਺͕ଟ͘ͳΔͱίϯύΠ ϧ͕஗͘ͳͬͯ͘Δ • αϒϓϩδΣΫτ౳ߟྀ͢Δ • API αʔόʔͱͯ͠ͷར༻ݕ౼
40. ίϯύΠϧ଎౓ྫ 0 50 100 67s 90s MBA 11-inch Mid 2012 (2.0 GHz intel Core i7) MBP Retina 15-inch Early 2013 (2.7 GHz Intel Core i7) ։ൃ࣌͸ຖճΫϦʔϯίϯ ύΠϧ͢ΔΘ͚Ͱ͸ͳ͘ɺ sbt ͕ࠩ෼ίϯύΠϧͯ͘͠ ΕΔ
41. ίϯύΠϧ଎౓վળ sources in (Compile, doc) := Nil, publishArtifact in (Compile, packageDoc) := false build.sbt • υΩϡϝϯτϑΝΠϧੜ੒͠ͳ͍ • ϑΝΠϧमਖ਼ޙʹࣗಈίϯύΠϧ $ sbt ~run # activator ~run
42. ޓ׵ੑ໰୊ • Play όʔδϣϯޓ׵ੑ໰୊ • ։ൃ଎౓͕଎͍ʢϝϦοτͰ΋͋Δʣ • Ҡߦظؒ͸͘ΕΔ͕ഁյత • Scala όʔδϣϯޓ׵ੑ໰୊ • ϚΠφʔόʔδϣϯ͝ͱʹόΠφϦޓ ׵ੑ͕ͳ͍ • ϥΠϒϥϦʹ PR ૹͬͨΓ fork ͨ͠Γ
43. sbt-web • grunt/gulp ͷΑ͏ͳϏϧυγεςϜ • ΤίγεςϜʹ৐ΔͨΊར༻͍ͯ͠ͳ ͍ • JS ք۾ͷར༻ਓ਺/ϥΠϒϥϦ਺ͷࠩ • όʔδϣϯΞοϓ໰୊
44. Build front-end with sbt • ։ൃ࣌͸ sbt ʹλεΫΛ௥Ճͯࣗ͠ಈ Ͱ gulp (npm) Λ࣮ߦ • https://www.playframework.com/ documentation/2.5.x/SBTCookbook
45. ϑϩϯτΤϯυ໰୊ • JavaScript/CSS मਖ਼΋ύοέʔδϯά • Scala ίϯύΠϧ଎౓໰୊ • ΤϯυϢʔβʔ͸ࠓࠔͬͯΔ • ࠩ͠໭͠Λ؆୯ʹͰ͖ΔΑ͏ʹ͢Δ • API αʔόʔͱͯ͠ͷར༻ݕ౼
46. ͕͜͜ବ໨ͩΑ Play ·ͱΊ • ϓϩδΣΫτ͕େ͖͘ͳΔͱίϯύΠϧ ࣌ؒ΋૿Ճ • ഁյతͳΞοϓάϨʔυ • อकతͳϓϩδΣΫτͰ͸ޙʑͭΒ͘ ͳΔ • Play ʹґଘ͗͢͠ͳ͍ • γεςϜʹݟ߹ͬͨߏ੒Λߟ͑Δ
47. Play Framework ·ͱΊ • Lightbend ࣾʹΑΔ Scala Web Framework ͷσϑΝΫτ • τϨϯυΛऔΓೖΕͯ։ൃ͕׆ൃ • গͳ͘ͱ΋ ̐ ೥͸ܧଓ͓ͯ͠Γɺ 2.6/3.0 ʹ޲͚ͯ։ൃத
48. Play Framework ·ͱΊ • ܕʹकΒΕͳ͕Βָ͘͠ Web ։ൃ • খ͍͞ϓϩδΣΫτɺࣾ಺πʔϧͰ࢝ ΊΔ͕Φεεϝ • Scala ͷػೳΛ͍֮͑ͯ͘ػձʹ΋ • API αʔόʔͱͯ͠࢖ͬͯΈΔ