117 lines
2.2 KiB
Go
117 lines
2.2 KiB
Go
package tunnel
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import (
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"errors"
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"io"
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)
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type Manager struct {
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Tunnel io.ReadWriter
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Connections map[ID]*Connection
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incoming chan *DataFrame
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outgoing chan *DataFrame
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accept chan *DataFrame
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closed chan bool
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newConnection chan *Connection
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delConnection chan *Connection
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}
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func NewManager(tun io.ReadWriter) *Manager {
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return &Manager{
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Tunnel: tun,
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Connections: make(map[ID]*Connection),
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incoming: make(chan *DataFrame, 1024),
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outgoing: make(chan *DataFrame, 1024),
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accept: make(chan *DataFrame, 1024),
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newConnection: make(chan *Connection),
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delConnection: make(chan *Connection),
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}
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}
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func (m *Manager) Run() {
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for {
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select {
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case <-m.closed:
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return
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case df := <-m.incoming:
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go df.Encode(m.Tunnel)
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case connection := <-m.newConnection:
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m.Connections[connection.ID] = connection
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case connection := <-m.delConnection:
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connection.Close()
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delete(m.Connections, connection.ID)
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default:
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go m.onReceive()
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}
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}
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}
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func (m *Manager) onReceive() {
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df := new(DataFrame)
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df.Decode(m.Tunnel)
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switch df.Type {
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case TypeRequest:
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m.accept <- df
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case TypeClosed:
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connection, ok := m.Connections[df.ID]
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if ok {
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m.delConnection <- connection
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}
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case TypeNormal:
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connection, ok := m.Connections[df.ID]
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if ok {
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connection.RX = m.outgoing
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m.outgoing <- df
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}
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}
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}
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func (m *Manager) Connect() (*Connection, error) {
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df := &DataFrame{
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ID: NewID(),
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Type: TypeRequest,
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}
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connection := &Connection{
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ID: df.ID,
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TX: m.incoming,
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}
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m.newConnection <- connection
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m.incoming <- df
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df = <-connection.RX
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if df.Type != TypeConnected {
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return nil, errors.New("failed to connect")
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}
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return connection, nil
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}
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func (m *Manager) Accept() (*Connection, error) {
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df := <-m.accept
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if df.Type != TypeRequest {
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return nil, errors.New("failed to accept")
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}
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connection := &Connection{
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ID: df.ID,
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TX: m.incoming,
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}
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m.newConnection <- connection
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df.Type = TypeConnected
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m.incoming <- df
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return connection, nil
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}
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func (m *Manager) Close() error {
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defer close(m.closed)
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defer close(m.accept)
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defer close(m.incoming)
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defer close(m.outgoing)
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for _, connection := range m.Connections {
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connection.Close()
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}
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m.closed <- true
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return nil
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}
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