94 lines
1.6 KiB
Go
94 lines
1.6 KiB
Go
package chain
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import (
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"context"
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"errors"
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"net"
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)
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type Route struct {
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nodes []*Node
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}
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func (r *Route) AddNode(node *Node) {
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r.nodes = append(r.nodes, node)
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}
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func (r *Route) Connect(ctx context.Context) (conn net.Conn, err error) {
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if r.IsEmpty() {
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return nil, errors.New("empty route")
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}
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node := r.nodes[0]
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cc, err := node.Transport().Dial(ctx, r.nodes[0].Addr())
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if err != nil {
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return
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}
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cn, err := node.Transport().Handshake(ctx, cc)
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if err != nil {
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cc.Close()
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return
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}
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preNode := node
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for _, node := range r.nodes[1:] {
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cc, err = preNode.Transport().Connect(ctx, cn, "tcp", node.Addr())
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if err != nil {
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cn.Close()
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return
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}
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cc, err = node.transport.Handshake(ctx, cc)
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if err != nil {
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cn.Close()
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}
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cn = cc
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preNode = node
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}
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conn = cn
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return
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}
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func (r *Route) Dial(ctx context.Context, network, address string) (net.Conn, error) {
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if r.IsEmpty() {
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return r.dialDirect(ctx, network, address)
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}
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conn, err := r.Connect(ctx)
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if err != nil {
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return nil, err
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}
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cc, err := r.Last().Transport().Connect(ctx, conn, network, address)
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if err != nil {
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conn.Close()
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return nil, err
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}
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return cc, nil
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}
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func (r *Route) dialDirect(ctx context.Context, network, address string) (net.Conn, error) {
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switch network {
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case "udp", "udp4", "udp6":
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if address == "" {
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return net.ListenUDP(network, nil)
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}
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default:
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}
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d := &net.Dialer{}
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return d.DialContext(ctx, network, address)
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}
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func (r *Route) IsEmpty() bool {
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return r == nil || len(r.nodes) == 0
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}
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func (r Route) Last() *Node {
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if r.IsEmpty() {
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return nil
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}
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return r.nodes[len(r.nodes)-1]
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}
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