scaleset/examples/dockerscaleset/config.go

package main

import (
	"fmt"
	"log/slog"
	"net/url"
	"os"
	"strings"

	"github.com/actions/scaleset"
)

type Config struct {
	RegistrationURL string
	MaxRunners      uint32
	MinRunners      uint32
	ScaleSetName    string
	RunnerGroup     string
	GitHubApp       scaleset.GitHubAppAuth
	Token           string
	RunnerImage     string
	LogLevel        string
	LogFormat       string
}

func (c *Config) defaults() {
	if c.RunnerGroup == "" {
		c.RunnerGroup = scaleset.DefaultRunnerGroup
	}
	if c.RunnerImage == "" {
		c.RunnerImage = "ghcr.io/actions/actions-runner:latest"
	}
}

func (c *Config) Validate() error {
	c.defaults()

	if _, err := url.ParseRequestURI(c.RegistrationURL); err != nil {
		return fmt.Errorf("invalid registration URL: %w, it should be the full URL of where you want to register your scale set, e.g. 'https://github.com/org/repo'", err)
	}

	appError := c.GitHubApp.Validate()
	if c.Token == "" && appError != nil {
		return fmt.Errorf("no credentials provided: either GitHub App (client id, installation id and private key) (recommended) or a Personal Access Token are required")
	}

	if c.ScaleSetName == "" {
		return fmt.Errorf("scale set name is required")
	}
	if c.MaxRunners < c.MinRunners {
		return fmt.Errorf("max runners cannot be less than min-runners")
	}
	if c.RunnerGroup == "" {
		return fmt.Errorf("runner group is required")
	}
	if c.RunnerImage == "" {
		return fmt.Errorf("runner image is required")
	}
	return nil
}

func (c *Config) ActionsAuth() *scaleset.ActionsAuth {
	if err := c.GitHubApp.Validate(); err == nil {
		return &scaleset.ActionsAuth{
			App: &c.GitHubApp,
		}
	}

	return &scaleset.ActionsAuth{
		Token: c.Token,
	}
}

func (c *Config) Logger() *slog.Logger {
	var lvl slog.Level
	switch strings.ToLower(c.LogLevel) {
	case "debug":
		lvl = slog.LevelDebug
	case "info":
		lvl = slog.LevelInfo
	case "warn":
		lvl = slog.LevelWarn
	case "error":
		lvl = slog.LevelError
	default:
		lvl = slog.LevelInfo
	}

	switch c.LogFormat {
	case "json":
		return slog.New(slog.NewJSONHandler(os.Stdout, &slog.HandlerOptions{
			AddSource: true,
			Level:     lvl,
		}))
	case "text":
		return slog.New(slog.NewTextHandler(os.Stdout, &slog.HandlerOptions{
			AddSource: true,
			Level:     lvl,
		}))
	default:
		return slog.New(slog.DiscardHandler)
	}
}