Golang Config.Singleton方法代碼示例

func runBootstrap(args *docopt.Args) error {
	log.SetFlags(log.Lmicroseconds)
	logf := textLogger
	if args.Bool["--json"] {
		logf = jsonLogger
	}
	var cfg bootstrap.Config

	manifestFile := args.String["<manifest>"]
	if manifestFile == "" {
		manifestFile = "/etc/flynn/bootstrap-manifest.json"
	}

	var steps []string
	if s := args.String["--steps"]; s != "" {
		steps = strings.Split(s, ",")
	}

	var err error
	manifest, err = readBootstrapManifest(manifestFile)
	if err != nil {
		return fmt.Errorf("Error reading manifest: %s", err)
	}

	if n := args.String["--min-hosts"]; n != "" {
		if cfg.MinHosts, err = strconv.Atoi(n); err != nil || cfg.MinHosts < 1 {
			return fmt.Errorf("invalid --min-hosts value")
		}
	}

	cfg.Timeout, err = strconv.Atoi(args.String["--timeout"])
	if err != nil {
		return fmt.Errorf("invalid --timeout value")
	}

	if ipList := args.String["--peer-ips"]; ipList != "" {
		cfg.IPs = strings.Split(ipList, ",")
		if cfg.MinHosts == 0 {
			cfg.MinHosts = len(cfg.IPs)
		}
	}

	if cfg.MinHosts == 0 {
		cfg.MinHosts = 1
	}

	cfg.Singleton = cfg.MinHosts == 1
	if s := os.Getenv("SINGLETON"); s != "" {
		cfg.Singleton = s == "true"
	}

	ch := make(chan *bootstrap.StepInfo)
	done := make(chan struct{})
	var last error
	go func() {
		for si := range ch {
			logf(si)
			last = si.Err
		}
		close(done)
	}()

	cfg.ClusterURL = args.String["--discovery"]
	if bf := args.String["--from-backup"]; bf != "" {
		err = runBootstrapBackup(manifest, bf, ch, cfg)
	} else {
		err = bootstrap.Run(manifest, ch, cfg, steps)
	}

	<-done
	if err != nil && last != nil && err.Error() == last.Error() {
		return ErrAlreadyLogged{err}
	}
	return err
}

//.........這裏部分代碼省略.........
OR uri = (SELECT env->>'%[2]s_IMAGE_URI' FROM releases WHERE release_id = (SELECT release_id FROM apps WHERE name = 'gitreceive'));`,
			artifactURIs[name+"-image"], strings.ToUpper(name)))
	}

	// update the URI of redis artifacts currently being referenced by
	// the redis app (which will also update all current redis
	// resources to use the latest redis image)
	sqlBuf.WriteString(fmt.Sprintf(`
UPDATE artifacts SET uri = '%s'
WHERE artifact_id = (SELECT (env->>'REDIS_IMAGE_ID')::uuid FROM releases WHERE release_id = (SELECT release_id FROM apps WHERE name = 'redis'))
OR uri = (SELECT env->>'REDIS_IMAGE_URI' FROM releases WHERE release_id = (SELECT release_id FROM apps WHERE name = 'redis'));`,
		artifactURIs["redis-image"]))

	// ensure the image ID environment variables are set for legacy apps
	// which use image URI variables
	for _, name := range []string{"redis", "slugbuilder", "slugrunner"} {
		sqlBuf.WriteString(fmt.Sprintf(`
UPDATE releases SET env = pg_temp.json_object_update_key(env, '%[1]s_IMAGE_ID', (SELECT artifact_id::text FROM artifacts WHERE uri = '%[2]s'))
WHERE env->>'%[1]s_IMAGE_URI' IS NOT NULL;`,
			strings.ToUpper(name), artifactURIs[name+"-image"]))
	}

	step := func(id, name string, action bootstrap.Action) bootstrap.Step {
		if ra, ok := action.(*bootstrap.RunAppAction); ok {
			ra.ID = id
		}
		return bootstrap.Step{
			StepMeta: bootstrap.StepMeta{ID: id, Action: name},
			Action:   action,
		}
	}

	// start discoverd/flannel/postgres/mariadb
	cfg.Singleton = data.Postgres.Release.Env["SINGLETON"] == "true"
	systemSteps := bootstrap.Manifest{
		step("discoverd", "run-app", &bootstrap.RunAppAction{
			ExpandedFormation: data.Discoverd,
		}),
		step("flannel", "run-app", &bootstrap.RunAppAction{
			ExpandedFormation: data.Flannel,
		}),
		step("wait-hosts", "wait-hosts", &bootstrap.WaitHostsAction{}),
		step("postgres", "run-app", &bootstrap.RunAppAction{
			ExpandedFormation: data.Postgres,
		}),
		step("postgres-wait", "wait", &bootstrap.WaitAction{
			URL: "http://postgres-api.discoverd/ping",
		}),
	}

	// Only run up MariaDB if it's in the backup
	if data.MariaDB != nil {
		systemSteps = append(systemSteps, step("mariadb", "run-app", &bootstrap.RunAppAction{
			ExpandedFormation: data.MariaDB,
		}))
		systemSteps = append(systemSteps, step("mariadb-wait", "wait", &bootstrap.WaitAction{
			URL: "http://mariadb-api.discoverd/ping",
		}))
	}

	// Only run up MongoDB if it's in the backup
	if data.MongoDB != nil {
		systemSteps = append(systemSteps, step("mongodb", "run-app", &bootstrap.RunAppAction{
			ExpandedFormation: data.MongoDB,
		}))
		systemSteps = append(systemSteps, step("mongodb-wait", "wait", &bootstrap.WaitAction{

//.........這裏部分代碼省略.........
UPDATE artifacts SET uri = '%s'
WHERE artifact_id = (SELECT artifact_id FROM releases
                     WHERE release_id = (SELECT release_id FROM apps
                     WHERE name = '%s'));`, step.Artifact.URI, step.ID))
		}
	}

	data.Discoverd.Artifact.URI = artifactURIs["discoverd"]
	data.Discoverd.Release.Env["DISCOVERD_PEERS"] = "{{ range $ip := .SortedHostIPs }}{{ $ip }}:1110,{{ end }}"
	data.Postgres.Artifact.URI = artifactURIs["postgres"]
	data.Flannel.Artifact.URI = artifactURIs["flannel"]
	data.Controller.Artifact.URI = artifactURIs["controller"]

	for _, app := range []string{"gitreceive", "taffy"} {
		for _, env := range []string{"slugbuilder", "slugrunner"} {
			sqlBuf.WriteString(fmt.Sprintf(`
UPDATE releases SET env = pg_temp.json_object_update_key(env, '%s_IMAGE_URI', '%s')
WHERE release_id = (SELECT release_id from apps WHERE name = '%s');`,
				strings.ToUpper(env), artifactURIs[env], app))
		}
	}

	step := func(id, name string, action bootstrap.Action) bootstrap.Step {
		if ra, ok := action.(*bootstrap.RunAppAction); ok {
			ra.ID = id
		}
		return bootstrap.Step{
			StepMeta: bootstrap.StepMeta{ID: id, Action: name},
			Action:   action,
		}
	}

	// start discoverd/flannel/postgres
	cfg.Singleton = data.Postgres.Release.Env["SINGLETON"] == "true"
	steps := bootstrap.Manifest{
		step("discoverd", "run-app", &bootstrap.RunAppAction{
			ExpandedFormation: data.Discoverd,
		}),
		step("flannel", "run-app", &bootstrap.RunAppAction{
			ExpandedFormation: data.Flannel,
		}),
		step("wait-hosts", "wait-hosts", &bootstrap.WaitHostsAction{}),
		step("postgres", "run-app", &bootstrap.RunAppAction{
			ExpandedFormation: data.Postgres,
		}),
		step("postgres-wait", "wait", &bootstrap.WaitAction{
			URL: "http://postgres-api.discoverd/ping",
		}),
	}
	state, err := steps.Run(ch, cfg)
	if err != nil {
		return err
	}

	// set DISCOVERD_PEERS in release
	sqlBuf.WriteString(fmt.Sprintf(`
UPDATE releases SET env = pg_temp.json_object_update_key(env, 'DISCOVERD_PEERS', '%s')
WHERE release_id = (SELECT release_id FROM apps WHERE name = 'discoverd')
`, state.StepData["discoverd"].(*bootstrap.RunAppState).Release.Env["DISCOVERD_PEERS"]))

	// load data into postgres
	cmd := exec.JobUsingHost(state.Hosts[0], host.Artifact{Type: data.Postgres.Artifact.Type, URI: data.Postgres.Artifact.URI}, nil)
	cmd.Entrypoint = []string{"psql"}
	cmd.Env = map[string]string{
		"PGHOST":     "leader.postgres.discoverd",
		"PGUSER":     "flynn",

//.........這裏部分代碼省略.........
	if data.MariaDB != nil {
		data.MariaDB.Artifact.URI = artifactURIs["mariadb"]
		if data.MariaDB.Processes["mariadb"] == 0 {
			// skip mariadb if it wasn't scaled up in the backup
			data.MariaDB = nil
		}
	}

	sqlBuf.WriteString(fmt.Sprintf(`
UPDATE artifacts SET uri = '%s'
WHERE uri = (SELECT env->>'SLUGRUNNER_IMAGE_URI' FROM releases WHERE release_id = (SELECT release_id FROM apps WHERE name = 'gitreceive'));`,
		artifactURIs["slugrunner"]))

	for _, app := range []string{"gitreceive", "taffy"} {
		for _, env := range []string{"slugbuilder", "slugrunner"} {
			sqlBuf.WriteString(fmt.Sprintf(`
UPDATE releases SET env = pg_temp.json_object_update_key(env, '%s_IMAGE_URI', '%s')
WHERE release_id = (SELECT release_id from apps WHERE name = '%s');`,
				strings.ToUpper(env), artifactURIs[env], app))
		}
	}

	step := func(id, name string, action bootstrap.Action) bootstrap.Step {
		if ra, ok := action.(*bootstrap.RunAppAction); ok {
			ra.ID = id
		}
		return bootstrap.Step{
			StepMeta: bootstrap.StepMeta{ID: id, Action: name},
			Action:   action,
		}
	}

	// start discoverd/flannel/postgres/mariadb
	cfg.Singleton = data.Postgres.Release.Env["SINGLETON"] == "true"
	systemSteps := bootstrap.Manifest{
		step("discoverd", "run-app", &bootstrap.RunAppAction{
			ExpandedFormation: data.Discoverd,
		}),
		step("flannel", "run-app", &bootstrap.RunAppAction{
			ExpandedFormation: data.Flannel,
		}),
		step("wait-hosts", "wait-hosts", &bootstrap.WaitHostsAction{}),
		step("postgres", "run-app", &bootstrap.RunAppAction{
			ExpandedFormation: data.Postgres,
		}),
		step("postgres-wait", "wait", &bootstrap.WaitAction{
			URL: "http://postgres-api.discoverd/ping",
		}),
	}

	// Only run up MariaDB if it's in the backup
	if data.MariaDB != nil {
		systemSteps = append(systemSteps, step("mariadb", "run-app", &bootstrap.RunAppAction{
			ExpandedFormation: data.MariaDB,
		}))
		systemSteps = append(systemSteps, step("mariadb-wait", "wait", &bootstrap.WaitAction{
			URL: "http://mariadb-api.discoverd/ping",
		}))
	}
	state, err := systemSteps.Run(ch, cfg)
	if err != nil {
		return err
	}

	// set DISCOVERD_PEERS in release
	sqlBuf.WriteString(fmt.Sprintf(`