What_s_up_Wasm_in_Go_.pdf

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1 What’s up Wasm in Go? GoでWebAssembly(Wasm)って今どんな感じなんでしたっけ? Taku Fukushima mercari.go #21 Feb 28, 2023

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2 Abstract of Wasm binary written in Rust Agenda Demo What’s up Wasm in Go? Summary 02 03 04 01

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3 Abstract of Wasm binary written in Rust Chapter 1

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4 Goal: USPS address lookup service ● Required in customers’ address management ● ZIP Code validation and address completion in forms ● Current status: gRPC API in a microservice ● Address information is a static data ○ 41,704 lines of CSV: 1.6 MiB ○ Monthly updated ○ We retrieve uniquely formatted data from USPS, parse it and generate a CSV ﬁle with K8s CronJob ● No JS/browser dependency ZIP Code → Address Information

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5 画像  Original data has all US address information in a line Our CSV data

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6 Make it Wasm binary ● CSV → binary data via Rust’s Build Scripts ○ We don’t want to load CSV at runtime ○ We want address data in binary ● Embed the binary into code via include_bytes! ● Compacted address info stored in Trie ○ std::collections::HashMap → rust-phf → fs_trie ● Export Wasm binary and JS compatibility layer via wasm-pack ZIP Code in string → Address Information in JSON

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7 Demo Chapter 2

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8 What’s up Wasm in Go? Chapter 3

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9 My past experience ● Go compiler has WASM target by default ○ GOOS=js GOARCH=wasm ○ With JavaScript glue ■ $(go env GOROOT)/misc/wasm/wasm_exec.js ○ Relatively bigger size Wasm binary ● TinyGo can generate binary with smaller footprint ○ tinygo build -o module.wasm -target wasi . Wasm binary generated from Go code contains Go runtime

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10 My current experience ● Still TinyGo is a good option ● go:embed can be used embedding binary data in Wasm binary ● Nice trie/radix tree library is needed with gob/binary format compatibility ○ github.com/hashicorp/go-immutable-radix did not get along with gob ○ * I just could not ﬁnd one and there could be any out there Not changed so much since last time

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11 Future? ● GC ● Threads ● Does Go dream of lightweight Wasm binary output? New Wasm standards are added

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12 Summary Chapter 4

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13 Go in Wasm ● Default Go compiler supports ● Still TinyGo is a good option ● We could see some improvements in the future? ● Various matured Wasm runtime ○ github.com/wasmerio/wasmer-go ○ github.com/tetratelabs/wazero ○ … Go has nice Wasm supports

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