dummy-service-workflow/gen.go

//go:build ignore

package main

import (
	"flag"
	"fmt"
	"os"
	"path/filepath"
)

func main() {
	countPtr := flag.Int("count", 2000, "Number of files to generate")
	flag.Parse()

	count := *countPtr
	dir := "dummy"

	fmt.Printf("Generating %d files in %s/...\n", count, dir)

	if err := os.MkdirAll(dir, 0755); err != nil {
		panic(err)
	}

	// Generate individual heavy files
	for i := 0; i < count; i++ {
		filename := filepath.Join(dir, fmt.Sprintf("file_%05d.go", i))
		content := fmt.Sprintf(`package dummy

import "math"

// Struct%[1]d is a dummy structure to consume memory during compilation
type Struct%[1]d struct {
	FieldA int
	FieldB string
	FieldC float64
	FieldD []int
	FieldE map[string]string
}

// Function%[1]d performs arbitrary calculations to consume CPU during compilation
func Function%[1]d(input int) float64 {
	s := Struct%[1]d{
		FieldA: input,
		FieldB: "dummy string to take up space in the binary symbol table",
		FieldC: float64(input) * 1.5,
		FieldD: []int{1, 2, 3, 4, 5},
		FieldE: map[string]string{"key": "value"},
	}
	
	// Some math operations
	res := math.Sqrt(s.FieldC) + float64(s.FieldA)
	for _, v := range s.FieldD {
		res += float64(v)
	}
	return res
}
`, i)
		if err := os.WriteFile(filename, []byte(content), 0644); err != nil {
			panic(err)
		}
	}

	// Generate entrypoint to ensure they are linked and not dead-code eliminated
	entrypoint := filepath.Join(dir, "entrypoint.go")
	entryContent := `package dummy

import "fmt"

// RunAll calls every generated function to prevent linker dead-code elimination
func RunAll() {
	sum := 0.0
`
	for i := 0; i < count; i++ {
		entryContent += fmt.Sprintf("\tsum += Function%d(%d)\n", i, i)
	}
	entryContent += `	fmt.Printf("Total calculation: %f\n", sum)
}
`
	if err := os.WriteFile(entrypoint, []byte(entryContent), 0644); err != nil {
		panic(err)
	}

	fmt.Println("Done.")
}