Ejemplo n.º 1
0
// ParseFlags is a helper function for parsing command line flags using Go's
// Flag library. This is extracted into a helper to keep the main function
// small, but it also makes writing tests for parsing command line arguments
// much easier and cleaner.
func (cli *CLI) ParseFlags(args []string) (*config.Config, bool, bool, bool, error) {
	var dry, once, version bool

	c := config.DefaultConfig()

	// configPaths stores the list of configuration paths on disk
	configPaths := make([]string, 0, 6)

	// Parse the flags and options
	flags := flag.NewFlagSet(Name, flag.ContinueOnError)
	flags.SetOutput(cli.errStream)
	flags.Usage = func() { fmt.Fprintf(cli.errStream, usage, Name) }

	flags.Var((funcVar)(func(s string) error {
		configPaths = append(configPaths, s)
		return nil
	}), "config", "")

	flags.Var((funcVar)(func(s string) error {
		c.Consul.Address = config.String(s)
		return nil
	}), "consul-addr", "")

	flags.Var((funcVar)(func(s string) error {
		a, err := config.ParseAuthConfig(s)
		if err != nil {
			return err
		}
		c.Consul.Auth = a
		return nil
	}), "consul-auth", "")

	flags.Var((funcBoolVar)(func(b bool) error {
		c.Consul.Retry.Enabled = config.Bool(b)
		return nil
	}), "consul-retry", "")

	flags.Var((funcIntVar)(func(i int) error {
		c.Consul.Retry.Attempts = config.Int(i)
		return nil
	}), "consul-retry-attempts", "")

	flags.Var((funcDurationVar)(func(d time.Duration) error {
		c.Consul.Retry.Backoff = config.TimeDuration(d)
		return nil
	}), "consul-retry-backoff", "")

	flags.Var((funcBoolVar)(func(b bool) error {
		c.Consul.SSL.Enabled = config.Bool(b)
		return nil
	}), "consul-ssl", "")

	flags.Var((funcVar)(func(s string) error {
		c.Consul.SSL.CaCert = config.String(s)
		return nil
	}), "consul-ssl-ca-cert", "")

	flags.Var((funcVar)(func(s string) error {
		c.Consul.SSL.CaPath = config.String(s)
		return nil
	}), "consul-ssl-ca-path", "")

	flags.Var((funcVar)(func(s string) error {
		c.Consul.SSL.Cert = config.String(s)
		return nil
	}), "consul-ssl-cert", "")

	flags.Var((funcVar)(func(s string) error {
		c.Consul.SSL.Key = config.String(s)
		return nil
	}), "consul-ssl-key", "")

	flags.Var((funcVar)(func(s string) error {
		c.Consul.SSL.ServerName = config.String(s)
		return nil
	}), "consul-ssl-server-name", "")

	flags.Var((funcBoolVar)(func(b bool) error {
		c.Consul.SSL.Verify = config.Bool(b)
		return nil
	}), "consul-ssl-verify", "")

	flags.Var((funcBoolVar)(func(b bool) error {
		c.Dedup.Enabled = config.Bool(b)
		return nil
	}), "dedup", "")

	flags.BoolVar(&dry, "dry", false, "")

	flags.Var((funcVar)(func(s string) error {
		c.Exec.Enabled = config.Bool(true)
		c.Exec.Command = config.String(s)
		return nil
	}), "exec", "")

	flags.Var((funcVar)(func(s string) error {
		sig, err := signals.Parse(s)
		if err != nil {
			return err
		}
		c.Exec.KillSignal = config.Signal(sig)
		return nil
	}), "exec-kill-signal", "")

	flags.Var((funcDurationVar)(func(d time.Duration) error {
		c.Exec.KillTimeout = config.TimeDuration(d)
		return nil
	}), "exec-kill-timeout", "")

	flags.Var((funcVar)(func(s string) error {
		sig, err := signals.Parse(s)
		if err != nil {
			return err
		}
		c.Exec.ReloadSignal = config.Signal(sig)
		return nil
	}), "exec-reload-signal", "")

	flags.Var((funcDurationVar)(func(d time.Duration) error {
		c.Exec.Splay = config.TimeDuration(d)
		return nil
	}), "exec-splay", "")

	flags.Var((funcVar)(func(s string) error {
		sig, err := signals.Parse(s)
		if err != nil {
			return err
		}
		c.KillSignal = config.Signal(sig)
		return nil
	}), "kill-signal", "")

	flags.Var((funcVar)(func(s string) error {
		c.LogLevel = config.String(s)
		return nil
	}), "log-level", "")

	flags.Var((funcDurationVar)(func(d time.Duration) error {
		c.MaxStale = config.TimeDuration(d)
		return nil
	}), "max-stale", "")

	flags.BoolVar(&once, "once", false, "")
	flags.Var((funcVar)(func(s string) error {
		c.PidFile = config.String(s)
		return nil
	}), "pid-file", "")

	flags.Var((funcVar)(func(s string) error {
		sig, err := signals.Parse(s)
		if err != nil {
			return err
		}
		c.ReloadSignal = config.Signal(sig)
		return nil
	}), "reload-signal", "")

	flags.Var((funcDurationVar)(func(d time.Duration) error {
		c.Consul.Retry.Backoff = config.TimeDuration(d)
		return nil
	}), "retry", "")

	flags.Var((funcBoolVar)(func(b bool) error {
		c.Syslog.Enabled = config.Bool(b)
		return nil
	}), "syslog", "")

	flags.Var((funcVar)(func(s string) error {
		c.Syslog.Facility = config.String(s)
		return nil
	}), "syslog-facility", "")

	flags.Var((funcVar)(func(s string) error {
		t, err := config.ParseTemplateConfig(s)
		if err != nil {
			return err
		}
		*c.Templates = append(*c.Templates, t)
		return nil
	}), "template", "")

	flags.Var((funcVar)(func(s string) error {
		c.Consul.Token = config.String(s)
		return nil
	}), "token", "")

	flags.Var((funcVar)(func(s string) error {
		c.Vault.Address = config.String(s)
		return nil
	}), "vault-addr", "")

	flags.Var((funcBoolVar)(func(b bool) error {
		c.Vault.RenewToken = config.Bool(b)
		return nil
	}), "vault-renew-token", "")

	flags.Var((funcBoolVar)(func(b bool) error {
		c.Vault.Retry.Enabled = config.Bool(b)
		return nil
	}), "vault-retry", "")

	flags.Var((funcIntVar)(func(i int) error {
		c.Vault.Retry.Attempts = config.Int(i)
		return nil
	}), "vault-retry-attempts", "")

	flags.Var((funcDurationVar)(func(d time.Duration) error {
		c.Vault.Retry.Backoff = config.TimeDuration(d)
		return nil
	}), "vault-retry-backoff", "")

	flags.Var((funcBoolVar)(func(b bool) error {
		c.Vault.SSL.Enabled = config.Bool(b)
		return nil
	}), "vault-ssl", "")

	flags.Var((funcVar)(func(s string) error {
		c.Vault.SSL.CaCert = config.String(s)
		return nil
	}), "vault-ssl-ca-cert", "")

	flags.Var((funcVar)(func(s string) error {
		c.Vault.SSL.CaPath = config.String(s)
		return nil
	}), "vault-ssl-ca-path", "")

	flags.Var((funcVar)(func(s string) error {
		c.Vault.SSL.Cert = config.String(s)
		return nil
	}), "vault-ssl-cert", "")

	flags.Var((funcVar)(func(s string) error {
		c.Vault.SSL.Key = config.String(s)
		return nil
	}), "vault-ssl-key", "")

	flags.Var((funcVar)(func(s string) error {
		c.Vault.SSL.ServerName = config.String(s)
		return nil
	}), "vault-ssl-server-name", "")

	flags.Var((funcBoolVar)(func(b bool) error {
		c.Vault.SSL.Verify = config.Bool(b)
		return nil
	}), "vault-ssl-verify", "")

	flags.Var((funcVar)(func(s string) error {
		c.Vault.Token = config.String(s)
		return nil
	}), "vault-token", "")

	flags.Var((funcBoolVar)(func(b bool) error {
		c.Vault.UnwrapToken = config.Bool(b)
		return nil
	}), "vault-unwrap-token", "")

	flags.Var((funcVar)(func(s string) error {
		w, err := config.ParseWaitConfig(s)
		if err != nil {
			return err
		}
		c.Wait = w
		return nil
	}), "wait", "")

	flags.BoolVar(&version, "v", false, "")
	flags.BoolVar(&version, "version", false, "")

	// TODO: Deprecations
	for i, a := range args {
		if a == "-auth" || strings.HasPrefix(a, "-auth=") {
			log.Println("[WARN] -auth has been renamed to -consul-auth")
			args[i] = strings.Replace(a, "-auth", "-consul-auth", 1)
		}

		if a == "-consul" || strings.HasPrefix(a, "-consul=") {
			log.Println("[WARN] -consul has been renamed to -consul-addr")
			args[i] = strings.Replace(a, "-consul", "-consul-addr", 1)
		}

		if strings.HasPrefix(a, "-ssl") {
			log.Println("[WARN] -ssl options should be prefixed with -consul")
			args[i] = strings.Replace(a, "-ssl", "-consul-ssl", 1)
		}
	}

	// If there was a parser error, stop
	if err := flags.Parse(args); err != nil {
		return nil, false, false, false, err
	}

	// Error if extra arguments are present
	args = flags.Args()
	if len(args) > 0 {
		return nil, false, false, false, fmt.Errorf("cli: extra args: %q", args)
	}

	// Create the final configuration
	finalC := config.DefaultConfig()

	// Merge all the provided configurations in the order supplied
	for _, path := range configPaths {
		c, err := config.FromPath(path)
		if err != nil {
			return nil, false, false, false, err
		}
		finalC = finalC.Merge(c)
	}

	// Add any CLI configuration options, since that's highest precedence
	finalC = finalC.Merge(c)

	// Finalize the configuration
	finalC.Finalize()

	return finalC, once, dry, version, nil
}
Ejemplo n.º 2
0
// init() creates the Runner's underlying data structures and returns an error
// if any problems occur.
func (r *Runner) init() error {
	// Ensure default configuration values
	r.config = config.DefaultConfig().Merge(r.config)

	// Print the final config for debugging
	result, err := json.Marshal(r.config)
	if err != nil {
		return err
	}
	log.Printf("[DEBUG] (runner) final config: %s", result)

	// Create the clientset
	clients, err := newClientSet(r.config)
	if err != nil {
		return fmt.Errorf("runner: %s", err)
	}

	// Create the watcher
	watcher, err := newWatcher(r.config, clients, r.once)
	if err != nil {
		return fmt.Errorf("runner: %s", err)
	}
	r.watcher = watcher

	numTemplates := len(*r.config.Templates)
	templates := make([]*template.Template, 0, numTemplates)
	ctemplatesMap := make(map[string]config.TemplateConfigs)

	// Iterate over each TemplateConfig, creating a new Template resource for each
	// entry. Templates are parsed and saved, and a map of templates to their
	// config templates is kept so templates can lookup their commands and output
	// destinations.
	for _, ctmpl := range *r.config.Templates {
		tmpl, err := template.NewTemplate(&template.NewTemplateInput{
			Source:     config.StringVal(ctmpl.Source),
			Contents:   config.StringVal(ctmpl.Contents),
			LeftDelim:  config.StringVal(ctmpl.LeftDelim),
			RightDelim: config.StringVal(ctmpl.RightDelim),
		})
		if err != nil {
			return err
		}

		if _, ok := ctemplatesMap[tmpl.ID()]; !ok {
			templates = append(templates, tmpl)
		}

		if _, ok := ctemplatesMap[tmpl.ID()]; !ok {
			ctemplatesMap[tmpl.ID()] = make([]*config.TemplateConfig, 0, 1)
		}
		ctemplatesMap[tmpl.ID()] = append(ctemplatesMap[tmpl.ID()], ctmpl)
	}

	// Convert the map of templates (which was only used to ensure uniqueness)
	// back into an array of templates.
	r.templates = templates

	r.renderEvents = make(map[string]*RenderEvent, numTemplates)
	r.dependencies = make(map[string]dep.Dependency)

	r.renderedCh = make(chan struct{}, 1)

	r.ctemplatesMap = ctemplatesMap
	r.inStream = os.Stdin
	r.outStream = os.Stdout
	r.errStream = os.Stderr
	r.brain = template.NewBrain()

	r.ErrCh = make(chan error)
	r.DoneCh = make(chan struct{})

	r.quiescenceMap = make(map[string]*quiescence)
	r.quiescenceCh = make(chan *template.Template)

	// Setup the dedup manager if needed. This is
	if config.BoolVal(r.config.Dedup.Enabled) {
		if r.once {
			log.Printf("[INFO] (runner) disabling de-duplication in once mode")
		} else {
			r.dedup, err = NewDedupManager(r.config.Dedup, clients, r.brain, r.templates)
			if err != nil {
				return err
			}
		}
	}

	return nil
}