/go-wasm-example

Primary LanguageJavaScriptMIT LicenseMIT

go-wasm-example

This repository contains example of how to run wasm binary compiled by Go and TinyGo. These exmaples are tested only on a web browser, not WASI compatiable envrionment.

The example shows:

  • Exporting Go function to JS side (which is same as TinyGo exmaple). See multiple function in the code.
  • Call async JS function from Go side. See addAsync function in the code.
  • Call async JS function which takes a callback function as argument from Go side. See addPromiss function in the code.

Since TinyGo 0.26.0, runtime.timer is implemented for wasm platform, Go code using timer feature, including context.WithTimeout, can be compiled. Older TinyGo version <0.26.0 will not work this code.

Usage

  • Build wasm binary
# using tiny go
bash scripts/build-tiny-wasm-on-docker
# using go
bash scripts/build-wasm-on-docker
  • Serve compiled binary and html
go run server.go --dir tiny-html
# if you use go version instead of tinygo version, use below
go run server.go --dir html

  • Access localhost:8080 from web broser.

  • Result are shown on Debug console (The screen still blank page since no content on html.)

  GEThttp://localhost:8080/favicon.ico
[HTTP/1.1 404 Not Found 0ms]

multiplied two numbers: 15 
adding promiss two numbers: 5
adding async two numbers: 5