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Proxy-Wasm: エッジでのWasm研究開発最先端
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mathetake
November 25, 2020
Technology
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Proxy-Wasm: エッジでのWasm研究開発最先端
@ Infra Study Meetup #8 「インフラと研究開発」
https://forkwell.connpass.com/event/193256/
mathetake
November 25, 2020
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Transcript
Takeshi Yoneda, Software Engineer, Tetrate.io Infra Study Meetup #8 ʮΠϯϑϥͱݚڀ։ൃʯ
Proxy-Wasm: ΤοδͰͷWasmݚڀ։ൃ࠷ઌ
• Takeshi Yoneda (Ϛελέ) / Twitter, Github: @mathetake • Software
Engineer at Tetrate, California, US • “Paid” OSS dev: Envoy, Istio, Proxy-Wasm, Wasm, TinyGo • C++ committer of Proxy-Wasm project • Creator of Go SDK for Proxy-Wasm • Contributor/Member of Chromium/V8, Envoy, TinyGo, Weaveworks/Flagger, etc. whoami
1. The current state of WebAssembly 2. Background: Envoy’s extensibility
3. Proxy-Wasm: WebAssembly For Proxies Agenda
1. The current state of WebAssembly
• Stack-basedͳԾϚγϯͱͦͷ༷ • ݩʑϒϥβ(JS)ͷߴԽ͕త • asm.js -> WebAssembly(Wasm)ͱਐԽ • ༷ΛಡΊ͔Δ͕Ұݴ
“host” ͷཁٻ͕ͳ͍ • Portable, platform-agnostic • Run at near-native speed: ΊͬͪΌ͍(※࣮ʹΑΔ) • Security: ελοΫ͕ϓϩάϥϜ͔Βݟ͑ͳ͍ͱ͔ͦ͏͍͏ͷ WebAssembly 101
• ༷ʑͳݴޠ͔ΒίϯύΠϧՄೳ: C, C++, Rust, Go(TinyGo), AssemblyScript • ॳjsͷΈࠐΈ͕લఏ: ͦΕͧΕͷݴޠ͕ಠࣗͷ
“glue.js”Λ࣋ͭ • ίϯύΠϥڞ௨ͷ“Platform”λʔήοτ͕ͳ͍(͍, jsͳΜ͚ͩͲ͞, Έ͍ͨͳ) • VMͱͯ͠༏ल&ίϯύΠϥج൫͋Δͷʹମͳ͍ -> ϒϥβͷ֎Ͱ͍͍ͨ • Wasm͔ΒݺͿsystem callͷ༷ΛܾΊ·͠ΐ͏ • WASI (WebAssembly System Interface)ͷొ • ͍ͭʹWasmϒϥβͷ֎ WebAssembly 101
• WASIΛ࣮ͨ͠ϥϯλΠϜ͕ొ͠, ϒϥβͷ֎ͰWasm͕ಈ͘Α͏ʹͳΔ • WAVM, Wasmtime, Wasmer, Lucet, V8 (wasm-c-apiܦ༝),
ʑ • ABIܾ͑͞ΊΕ, ҙͷΞϓϦͷதͰVMΛಈָ͔͍ͯ͜͠͠ͱ͕Ͱ͖ͦ͏ʂ • WASIʹݶΒ༷ͣʑͳABI͕ొ͍ͯ͠ΔΒ͍͠ • Blockchain্Ͱಈ͘VM, ProxyαʔόͰಈ͘VM, etc. Wasm gets out of web browsers
• WASIΛ࣮ͨ͠ϥϯλΠϜ͕ొ͠, ϒϥβͷ֎ͰWasm͕ಈ͘Α͏ʹͳΔ • WAVM, Wasmtime, Wasmer, Lucet, V8 (wasm-c-apiܦ༝),
ʑ • ABIܾ͑͞ΊΕ, ҙͷΞϓϦͷதͰVMΛಈָ͔͍ͯ͜͠͠ͱ͕Ͱ͖ͦ͏ʂ • WASIʹݶΒ༷ͣʑͳABI͕ొ͍ͯ͠ΔΒ͍͠ • Blockchain্Ͱಈ͘VM, ProxyαʔόͰಈ͘VM, etc. Wasm gets out of web browsers ࠓͷ͓
2. Background: Envoy’s extensibility
• “Cloud-native high-performance edge/middle/service proxy” • CNCF Graduated Project, Github
Star: 15,000+ • Written in C++ • αʔϏεϝογϡͷData planeͱͯ͠།Ұແೋͷଘࡏ What is Envoy?
• ϓϩΩγαʔόʔͳͷͰuse case͕ແݶ -> ϓϥάΠϯ(֦ு)ػߏ͕ଘࡏ • C++Ͱॻ͔ͳ͍ͱ͍͚ͳ͍ • ੩తϦϯΫ͠ͳ͍ͱ͍͚ͳ͍: ࣗͰΞΠπΛϏϧυ͠ͳ͍ͱ͍͚ͳ͍
• ϓϥάΠϯͷߋ৽, upstreamͷैͷͨͼʹrebuild, ࠶ىಈ • ສਓ͚Ͱͳ͍͠ਏ͍ • ಈత͔ͭηΩϡΞ͔ͭෳݴޠͰ֦ு͍ͨ͠ Envoy’s extensibility
3. Proxy-wasm: WebAssembly For Proxies
• WasmͷVMΛEnvoyͷதͰಈ͔ͯ͠WasmͷϓϩάϥϜͰ֦ு͠Α͏ • Envoy/Wasm VMؒͷABI͚ܾͩΊΕҙͷݴޠͰ֦ுͰ͖Δʂ • ͔͠ηΩϡΞ, WasmͷVMͷ࠶ىಈࣗମϥϯλΠϜͰՄೳ • =>
ͯ͢ͷ՝ΛΫϦΞ • ͦͦϓϩΩγαʔόͷ֦ுͳΜͯීวతͳͷͳͣ • => Proxy-Wasmͱ͍͏Envoyಠཱͨ͠ϓϩδΣΫτʹ Proxy-Wasm: WebAssembly for Proxies
• Proxy-Wasm: https://github.com/proxy-wasm orgͷੜ • ݱঢ়̐ͭͷݴޠͰProxy-Wasm compatibleͳWasmͷίϯύΠϧ͕Մೳ: • C++, Rust,
Go(TinyGO), AssemblyScript • ࠷৽όʔδϣϯv0.2.1, ·ͩ·ͩൃల్্(Join us!) • Hostͷެ࣮ࣜC++ͷΈ͕ͩ, GoͷϓϩΩγmosnͰ։ൃ͕͞Ε͍ͯΔΒ͍͠ Proxy-Wasm: WebAssembly for Proxies
• EnvoyProxy-Wasm orgͰ։ൃ͞Ε͍ͯΔC++ͷϥΠϒϥϦΛ༻ • 1 VM / (Plugin, Thread) ͱ͍͏ํࣜ
• TcphttpϦΫΤετͷΠϕϯτຖʹ VMʹ͔͚֦ͯுػߏΛఏڙ • VMͱͯ͠ V8, WAVM, Wasmtime ͕ΘΕ͍ͯΔ Proxy-Wasm in Envoy
• V8, WAVM, WasmtimeΛಉ࣌ʹlink͠Α͏ͱͨ͠Βsymbol͕িಥ • ͍͍ͩͨΈࠐ·ΕͯΔCݴޠͷϥΠϒϥϦىҼ • ҙͷϓϩάϥϜ͔ΒͲ͏ͷΑ͏ʹϗετΛकΔ͔? • ςετॻ͍ͯॻ͍ͯॻ͖͖Εͳ͍
• I/F͕ηΩϡΞͱ͍͑ɺಛఆͷύεͰΫϥογϡ͢Δ͜ͱ͋Δ • ύϑΥʔϚϯεͷ • Near-nativeͱ͍͑ͬͺΓগ͍͠ • GC͖ͷݴޠProxy-Wasm͚ͷGCΞϧΰϦζϜΛ։ൃ͠ͳ͍ͱ͍͚ͳ͍? Challenges in Proxy-Wasm
• Wasm = ϒϥβͱݴ͏࣌ऴΘΓ • ϋΠύϑΥʔϚϯε͔ͭηΩϡΞͳϓϥάΠϯػߏͷ։ൃ͕Մೳ • Proxy-WasmϓϩδΣΫτͰ࠷ઌͰݚڀ։ൃΛਐΊ͍ͯ·͢ʂ • We
are hiring! https://www.tetrate.io/careers/ ·ͱΊ