package helm import ( "fmt" "github.com/pelotech/drone-helm3/internal/env" "github.com/pelotech/drone-helm3/internal/run" "os" ) const ( kubeConfigTemplate = "/root/.kube/config.tpl" kubeConfigFile = "/root/.kube/config" ) // A Step is one step in the plan. type Step interface { Prepare() error Execute() error } // A Plan is a series of steps to perform. type Plan struct { steps []Step cfg env.Config } // NewPlan makes a plan for running a helm operation. func NewPlan(cfg env.Config) (*Plan, error) { p := Plan{ cfg: cfg, } p.steps = (*determineSteps(cfg))(cfg) for i, step := range p.steps { if cfg.Debug { fmt.Fprintf(os.Stderr, "calling %T.Prepare (step %d)\n", step, i) } if err := step.Prepare(); err != nil { err = fmt.Errorf("while preparing %T step: %w", step, err) return nil, err } } return &p, nil } // determineSteps is primarily for the tests' convenience: it allows testing the "which stuff should // we do" logic without building a config that meets all the steps' requirements. func determineSteps(cfg env.Config) *func(env.Config) []Step { switch cfg.Command { case "upgrade": return &upgrade case "uninstall", "delete": return &uninstall case "lint": return &lint case "help": return &help default: switch cfg.DroneEvent { case "push", "tag", "deployment", "pull_request", "promote", "rollback": return &upgrade case "delete": return &uninstall default: return &help } } } // Execute runs each step in the plan, aborting and reporting on error func (p *Plan) Execute() error { for i, step := range p.steps { if p.cfg.Debug { fmt.Fprintf(p.cfg.Stderr, "calling %T.Execute (step %d)\n", step, i) } if err := step.Execute(); err != nil { return fmt.Errorf("while executing %T step: %w", step, err) } } return nil } var upgrade = func(cfg env.Config) []Step { var steps []Step steps = append(steps, run.NewInitKube(cfg, kubeConfigTemplate, kubeConfigFile)) for _, repo := range cfg.AddRepos { steps = append(steps, run.NewAddRepo(cfg, repo)) } if cfg.UpdateDependencies { steps = append(steps, run.NewDepUpdate(cfg)) } steps = append(steps, run.NewUpgrade(cfg)) return steps } var uninstall = func(cfg env.Config) []Step { var steps []Step steps = append(steps, run.NewInitKube(cfg, kubeConfigTemplate, kubeConfigFile)) if cfg.UpdateDependencies { steps = append(steps, run.NewDepUpdate(cfg)) } steps = append(steps, run.NewUninstall(cfg)) return steps } var lint = func(cfg env.Config) []Step { var steps []Step for _, repo := range cfg.AddRepos { steps = append(steps, run.NewAddRepo(cfg, repo)) } if cfg.UpdateDependencies { steps = append(steps, run.NewDepUpdate(cfg)) } steps = append(steps, run.NewLint(cfg)) return steps } var help = func(cfg env.Config) []Step { return []Step{run.NewHelp(cfg)} }