Okioに愛を込めて - Speaker Deck

Okioに愛を込めて

by RyuNen344

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OkioʹѪΛࠐΊͯ RyuNen344 2024.06.22 Kotlin Fest

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Today's TL;DR

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Today's TL;DR ೰ΉͳΒ͍ͬͦOkio

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• What we get/lost after Kotlinize/KMPnize? • About Okio • Source/Sink/Buffer/Segment • Big Love to ByteString • FileSystem and Path • How much does okio ommit our codes? • Okio? kotlinx-io? Outline

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What we get after Kotlinize?

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Null Safety What we get after Kotlinize? એݴΛݟΔ͚ͩͰnullΛ ͱΓ͏Δͷ͔͕Θ͔Δ

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Immutability What we get after Kotlinize? ෆมΛ༏ઌͱͨ͠APIઃܭ

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Unboxed Primitive Types What we get after Kotlinize? ΑΓݎ࿚ͳ੩తܕγεςϜ

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Null Safety What we get after Kotlinize? Immutability Unboxed Primitive Types

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Null Safety Unboxed Primitive Types Immutability What we get after Kotlinize? ࣦͬͨ΋ͷ͸ͳ͍ɾɾɾʁ

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What we lost after Kotlinize? Q. Is Kotlin compatible with the Java programming language? A. Yes. Kotlin is 100% interoperable with https://kotlinlang.org/docs/faq.html

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What we lost after Kotlinize? Q. ຊ౰ʹʁ A. ৚݅෇͖(ݸਓͷҙݟؚΉ)

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• Primitive Array͸Immutableͱͯ͠એݴ͍ͯͯ͠΋஋ΛมߋͰ͖Δ What we lost after Kotlinize?

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• ΑΓݎ࿚ͳܕγεςϜʹͳͬͨͨΊNumberͱPrimitiveͳArrayཁૉͷ ҉໧తܕม׵͕ࣦΘΕΔέʔε͕͋Δ • e.g.) Java: byte[]ͱKotlin: ByteArray What we lost after Kotlinize?

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• ΑΓݎ࿚ͳܕγεςϜʹͳͬͨͨΊNumberͱPrimitiveͳArrayཁૉͷ ҉໧తܕม׵͕ࣦΘΕΔέʔε͕͋Δ What we lost after Kotlinize?

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• ΑΓݎ࿚ͳܕγεςϜʹͳͬͨͨΊNumberͱPrimitiveͳArrayཁૉͷ ҉໧తܕม׵͕ࣦΘΕΔέʔε͕͋Δ What we lost after Kotlinize? intͱbyteͷ҉໧తͳม׵

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• ΑΓݎ࿚ͳܕγεςϜʹͳͬͨͨΊNumberͱPrimitiveͳArrayཁૉͷ ҉໧తܕม׵͕ࣦΘΕΔέʔε͕͋Δ What we lost after Kotlinize? Int΋͘͠͸Byte΁ͷ໌ࣔతͳม׵

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What we lost after KMPnize?

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What we lost after KMPnize? java.* API ؙͬͱ࢖͑ͳ͍

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Q. java.* API͕࢖͑ͳ͍ͱͲ͏ͳΔʁ What we lost after KMPnize? A. ࣮૷͕େมʹͳΔύλʔϯ͕͋Δ

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Q1. java.util.Base64࢖͑ͳ͍͚ͲͲ͏͢Δʁ What we lost after KMPnize? A1. Plan1. expect/actualΛ࢖ͬͯࣗલ࣮૷ Plan2. kotlin.io.encoding.Base64(from Kotlin 1.8)Λ࢖͏

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Q1. java.util.Base64࢖͑ͳ͍͚ͲͲ͏͢Δʁ What we lost after KMPnize? A1. Plan1. expect/actualΛ࢖ͬͯࣗલ࣮૷ Plan2. kotlin.io.encoding.Base64(from Kotlin 1.8)Λ࢖͏ stdlibʹػೳ͕֦ு͞ΕΕ͹ࣗલͰͳͯ͘Α͍ ʢkotlin.io.encoding.Base64͸platform͝ͱʹ࣮૷͕෼͔ΕΔ͔֬ ఆ͍ͯ͠ͳ͍ͷͰ஫ҙ͢Δඞཁ͸͋Δʣ

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Q2. java.time API࢖͑ͳ͍͚ͲͲ͏͢Δʁ What we lost after KMPnize? A2. kotlinx-datetimeΛಋೖ͢Δ

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Q2. java.time API࢖͑ͳ͍͚ͲͲ͏͢Δʁ What we lost after KMPnize? A2. kotlinx-datetimeΛಋೖ͢Δ ެࣜϥΠϒϥϦΛಋೖ͢Δ͜ͱͰղܾ͢ΔͷͰ͋Ε͹ͦΕͰΑ͍

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Q3. java.io.{Input|Output}Stream͸ʁjava.io.File͸ʁ What we lost after KMPnize? A3.

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Q3. java.io.{Input|Output}Stream͸ʁjava.io.File͸ʁ What we lost after KMPnize? A3. OkioΛೖΕ·͠ΐ͏ kotlinx-io͋Δ͚Ͳͦͷ࿩͸͋ͱͰ....

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• Block(چSquare)͕ࣾ؅ཧ͢ΔOSS • ݩʑ͸OkHttpͷҰ෦ͱͯ͠java.io, java.nioͷऔΓճ͠ΛΑ͘͢Δͨ Ίʹ࡞ΒΕ͍ͯͨ • MoshiɺRetro fi tͰ΋core෦෼͸OkioΛ࢖࣮ͬͯ૷͞Ε͍ͯΔ About Okio

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Source/Sink/Bu ff er/Segment Source/ Sink Buffer/ Segment

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Source/Sink/Bu ff er/Segment Source/ Sink • {Input|Output}StreamʹରԠ͢ΔOkioಠࣗͷ interface • KtorͳͲͷϥΠϒϥϦ͸ࣗલͰಉ༷ͷ࣮૷Λ ߦͳ͍ͬͯͨΓ͢Δ • KMPʹ͸{Input|Output}Stream͕ͳ͍ͨΊɺ ͜ͷinterface͕KMPͱ࣮ͯ͠૷͞Ε͍ͯΔ͜ͱ ͕͋Γ͕͍ͨ

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Source/Sink/Bu ff er/Segment Buffer/ Segment • ݩʑ͸java.nio.Bufferͷ֦ுΛ໨తͱͨ͠Ϋϥε • Buffer͸࣮σʔλͷίϯςφͰ͋ΔSegmentͷ॥؀Ϧ ετͰ࣮૷͞Ε͍ͯΔͨΊՄม௕ • σʔλͷҠಈΛSegmentͷ෇͚ସ͑ʹΑ࣮ͬͯݱ͢Δ • ҆શʹσʔλΛ௥ՃͰ͖Δ • ୯ʹByteArrayͷΠϯελϯεΛ৽͘͠࡞੒ͯ͠ί ϐʔ͢ΔΑΓলίετͰ஋ΛҠಈͰ͖Δ

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• Τϯίʔυॲཧ͖ͭByteArray • HEX, UTF-8, Base64, MD5, SHA256, HMAC-SHA͕ϝιουҰͭͰॲ ཧͰ͖Δ • UTF-8ΛΤϯίʔυ͢Δࡍ͸ϝϞϦ্ʹΩϟογϡͯ͘͠ΕΔͷͰ࠶ Τϯίʔυ࣌ͷύϑΥʔϚϯε͕Α͍ Big Love to ByteString

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• OkioશൠͰUTF-8Λલఏͱͨ͠IF͕૊·Ε͍ͯΔ • Java String͕಺෦తʹUTF-16ͰจࣈྻΛѻ͏ॾ໰୊Λߟྀ͠ͳͯ͘Α ͘ͳΔ • K/N͸Posix APIͰ͋Ε͜ΕΛૢ࡞͢ΔͷͰטΈ߹͍͕ྑ͍ • toString΋ࣗಈͰΤϯίʔυ͞ΕΔͷͰϓϦϯτσόοά͠΍͍͢ • e.g.) [size=0], [size=12, hex=AEADBFF] Big Love to ByteString

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• ͦ΋ͦ΋JVM(android)͚ͩͰ΋ϑΝΠϧͷऔಘɺૢ࡞͸΍Γํ͕͍ͬͺ͍ ͋Δ • ClassLoader, TempDir, CacheDir, Asset, ExternalStorageɾɾɾɾ • ͡Ό͋ଞͷPlatform΋࣮૷͢Δͱͨ͠Βɾɾɾʁ • e.g.) Bundle, NSHomeDirectoryɾɾɾɾ • KotlinͷFileૢ࡞ܥͷAPI͸JVM onlyͷͨΊKMP͸ϑΝΠϧૢ࡞͕ۤखɾɾɾ FileSystem and Path

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• java.nio. fi le.FileSystemͱjava.nio. fi le.PathʹͦΕͧΕରԠ͢Δokio.FileSystemͱ okio.PathͰߏ੒͞ΕΔ • JVM͸java.io or java.nioɺNative͸Posix APIʹΑΔ࣮૷ • androidͷAssetɺNode΍WASMͳͲ֤Platformઐ༻ͷ֦ு΋༻ҙͯ͋͠Δ • ֤PlatformͷAPIͷ্ʹinterfaceΛ༻ҙ͞Ε͍ͯΔͷͰ • ϢʔβʔಠࣗͷFileSystem࣮૷΋͓खܰͰ͋Γ͕͍ͨ • ςελϏϦςΟ͕޲্ͯ͋͠Γ͕͍ͨ FileSystem and Path

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• ࣮ࡍʹͲΕ͙Β͍ίʔυ͕ݮΔͷ͔ʁ • ByteStringɿJWS(HS256) • FileSystem,PathɿcommonTestͷڞ௨Ϧιʔε How much does okio ommit our codes? Okioͷ༗ແͰൺֱͯ͠Έ·͠ΐ͏

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Create JWS(HS256) with Okio eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMj M0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxN TE2MjM5MDIyfQ.kK9JnTXZwzNo3BYNXJT57PGLnQk- Xyu7IBhRWFmc4C0

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Create JWS(HS256) with Okio eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMj M0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxN TE2MjM5MDIyfQ.kK9JnTXZwzNo3BYNXJT57PGLnQk- Xyu7IBhRWFmc4C0 ${header}.${payload}.${signature}

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$header = base64url(json) $payload = base64url(json) $signature = base64url(HMAC-SHA256($ {header}.${payload})) $JWS = ${header}.${payload}. ${signature} Create JWS(HS256) with Okio

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expect/actualͰ࡞Βͳ͖Ό͍͚ͳ͍΋ͷ͸ɾɾɾɾ 1. Base64ɿjava.util.Base64͕ແ͍ 2. HMAC-SHA256ɿjavax.crypto.Mac͕ແ͍ Create JWS(HS256) with Okio

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Create JWS(HS256) with Okio

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Create JWS(HS256) with Okio

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Create JWS(HS256) with Okio

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Create JWS(HS256) with Okio ७ਮʹ࣮૷͕ଟ͍ Platform͕૿͑Ε͹ͦͷ෼࣮૷΋૿͑Δ

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Create JWS(HS256) with Okio

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Create JWS(HS256) with Okio commonίʔυ͚ͩͰ׬݁ͯ͋͠Γ͕͍ͨ ϓϦϯτσόοά΋͠΍ͯ͋͘͢Γ͕͍ͨ

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Shared CommonTest Resource with Okio • commonTest/resourcesʹ fi xture(json, proto...etc)Λ഑ஔ͢Δ૝ఆ • commonTest/resources഑ԼͷϑΝΠϧΛࢀর͢Δʹ͸Platform͝ͱ ʹ޻෉͕ඞཁ

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Shared CommonTest Resource with Okio androidUnitTest iosTest current directory project root NSFileManager#currentDirectoryPath /Users/$name/Library/Developer/ CoreSimulator/Devices/$UUID/data resource directory ClassLoaderܦ༝ src/androidUnitTest/resource NSBundle.mainBundle.bundlePath build/bin/ios${arch}/debugTest

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Shared CommonTest Resource with Okio • commonTest/resourcesͷ fi leΛࢀর͢Δexpect/actualΛ࡞੒͢Δ

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Shared CommonTest Resource with Okio • commonTest/resourcesͷ fi leΛࢀর͢Δexpect/actualΛ࡞੒͢Δ ϑΝΠϧܾΊଧͪͰ͸औಘͰ͖Δ͕ ϑΝΠϧҰཡΛऔಘ͢Δ౳͕Ͱ͖ͳ͍

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Shared CommonTest Resource with Okio • commonTest/resourcesͷPathΛฦ٫͢Δexpect/actualΛ࡞੒͢Δ

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Shared CommonTest Resource with Okio • commonTest/resourcesͷPathΛฦ٫͢Δexpect/actualΛ࡞੒͢Δ

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Shared CommonTest Resource with Okio • commonTest/resourcesͷPathΛฦ٫͢Δexpect/actualΛ࡞੒͢Δ OkioͷFileSystemͱPathΛ࢖͏͜ͱͰ ֦ுੑߴ͘resourceΛಡΈࠐΊΔΑ͏ʹͳͬͯ͋Γ͕͍ͨ

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Okio? kotlinx-io? Q. ެࣜϥΠϒϥϦɺͳ͍ͷʁ A. ͋Γ·͢

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Okio? kotlinx-io? Q. ެࣜϥΠϒϥϦɺͳ͍ͷʁ A. ͋Γ·͢

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• Kotlin/kotlinx-io • ͠͹Β͘։ൃ͕ࢭ·͍͕ͬͯͨ1೥લ͙Β͍͔Β࠶։͞Εͨ experimentalͳϥΠϒϥϦʔ • جຊίϯηϓτ͸OkioͷSource, Sink, Buffer, Segment, ByteStringͱ ڞ௨ • ktor-io͸kotlinx-ioʹஔ͖׵͍͑ͯ͘༧ఆʢKTOR-6036ʣ Okio? kotlinx-io?

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• kotlinx-ioͷ։ൃ͕࠶։͞ΕΔͷʹؾ͍ͮͨࣗ෼͕ڻ͍͍ͯΔπΠʔτ ͕ͪΐ͏Ͳ1೥લ͙Β͍Ͱͨ͠ Okio? kotlinx-io? https://twitter.com/RyuNen344/status/1668992754704105480

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• Base64΍HASHؔ਺पΓ͸࣮૷͞Ε͍ͯͳ͍ • CipherStream౳ͷJVM Speci fi cͳAPI͸࣮૷͞Ε͍ͯͳ͍ • FileSystem͕sealed interfaceͰએݴ͞Ε͍ͯͯಠࣗͷFileSystemΛ࡞ ੒Ͱ͖ͳ͍ • FileSystemͷ࣮૷͕ΑΓPlatform Speci fi cͳAPIʹͳ͍ͬͯΔ • e.g.) iOSͷϑΝΠϧ؅ཧ͸NSFileManagerΛ࢖࣮ͬͯ૷ Okio? kotlinx-io?

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Summary • KMP͸IO͕ۤख • OkioΛ࢖͏ͱจࣈΤϯίʔυɺόΠτ഑ྻૢ࡞Ͱ೰Ή৔໘͕ݮΔ • kotlinx-io΋։ൃ͞Ε͍ͯΔ͕ݱঢ়͸·ͩOkioΑΓػೳ͕ͳ͍

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About Me • ଟ෼5೥͘Β͍androidΞϓϦ։ൃऀ • KMP޷͖ • Kodee͘Μͷ͵͍͙ΔΈ͕ཉ͍͠

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OkioʹIOࠐΊͯ w w 2024.06.22 Kotlin Fest RyuNen344

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Refs • https://square.github.io/okio/ • https://developer.squareup.com/blog/kotlin-multiplatform-shared- test-resources/ • https://x.com/ttuusskk/status/1722922182475694293/

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EOF