lxd/cluster/gateway.go
func NewGateway(db *db.Node, cert *shared.CertInfo, options ...Option) (*Gateway, error) {
	ctx, cancel := context.WithCancel(context.Background())

	o := newOptions()
	for _, option := range options {
		option(o)

	}

	gateway := &Gateway{
		db:        db,
		cert:      cert,
		options:   o,
		ctx:       ctx,
		cancel:    cancel,
		upgradeCh: make(chan struct{}, 16),
		acceptCh:  make(chan net.Conn),
		store:     &dqliteServerStore{},
	}

	err := gateway.init()
	if err != nil {
		return nil, err
	}

	return gateway, nil
}
func NewGateway(db *db.Node, cert *shared.CertInfo, options ...Option) (*Gateway, error) {
	ctx, cancel := context.WithCancel(context.Background())

	o := newOptions()
	for _, option := range options {
		option(o)

	}

	gateway := &Gateway{
		db:        db,
		cert:      cert,
		options:   o,
		ctx:       ctx,
		cancel:    cancel,
		upgradeCh: make(chan struct{}, 16),
		acceptCh:  make(chan net.Conn),
		store:     &dqliteServerStore{},
	}

	err := gateway.init()
	if err != nil {
		return nil, err
	}

	return gateway, nil
}
// NewGateway creates a new Gateway for managing access to the dqlite cluster.
//
// When a new gateway is created, the node-level database is queried to check
// what kind of role this node plays and if it's exposed over the network. It
// will initialize internal data structures accordingly, for example starting a
// dqlite driver if this node is a database node.
//
// After creation, the Daemon is expected to expose whatever http handlers the
// HandlerFuncs method returns and to access the dqlite cluster using the gRPC
// dialer returned by the Dialer method.