wasi-module-sdk-go/examples/hello_world_go/module/hello_world.go

package module

import (
	"fmt"
	"os"

	"code.icb4dc0.de/buildr/wasi-module-sdk-go/exec"

	"golang.org/x/exp/slog"

	sdk "code.icb4dc0.de/buildr/wasi-module-sdk-go"
)

var _ sdk.Module = (*HelloWorld)(nil)

type HelloWorld struct {
	Name string
}

func (h HelloWorld) Execute(ctx sdk.ExecutionContext) error {
	logger := ctx.Logger()

	logger.Info("Executing hello world", slog.String("name", h.Name))

	if f, err := os.CreateTemp(ctx.OutDir(), "hello_world.*.txt"); err != nil {
		return err
	} else if err = f.Close(); err != nil {
		return err
	}

	if foundPath, err := exec.LookPath("go"); err != nil {
		return err
	} else {
		logger.Info("found path for go", slog.String("path", foundPath))
	}

	cmd := exec.NewCommand("/bin/bash", "-c", `set -ex; echo "Hello process execution!"`)

	if err := cmd.Run(); err != nil {
		return err
	}

	fmt.Println("Hello world")
	_, _ = fmt.Fprint(ctx.StdOut(), "Hello world via pipeline")

	return nil
}

func (HelloWorld) Category() sdk.Category {
	return sdk.CategoryTask
}

func (HelloWorld) Type() string {
	return "hello_world"
}