package mux
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import (
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"sync"
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"github.com/v2fly/v2ray-core/v5/common"
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"github.com/v2fly/v2ray-core/v5/common/buf"
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"github.com/v2fly/v2ray-core/v5/common/protocol"
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)
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type SessionManager struct {
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sync.RWMutex
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sessions map[uint16]*Session
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count uint16
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closed bool
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}
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func NewSessionManager() *SessionManager {
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return &SessionManager{
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count: 0,
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sessions: make(map[uint16]*Session, 16),
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}
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}
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func (m *SessionManager) Closed() bool {
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m.RLock()
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defer m.RUnlock()
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return m.closed
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}
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func (m *SessionManager) Size() int {
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m.RLock()
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defer m.RUnlock()
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return len(m.sessions)
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}
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func (m *SessionManager) Count() int {
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m.RLock()
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defer m.RUnlock()
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return int(m.count)
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}
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func (m *SessionManager) Allocate() *Session {
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m.Lock()
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defer m.Unlock()
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if m.closed {
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return nil
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}
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m.count++
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s := &Session{
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ID: m.count,
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parent: m,
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}
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m.sessions[s.ID] = s
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return s
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}
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func (m *SessionManager) Add(s *Session) {
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m.Lock()
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defer m.Unlock()
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if m.closed {
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return
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}
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m.count++
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m.sessions[s.ID] = s
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}
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func (m *SessionManager) Remove(id uint16) {
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m.Lock()
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defer m.Unlock()
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if m.closed {
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return
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}
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delete(m.sessions, id)
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if len(m.sessions) == 0 {
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m.sessions = make(map[uint16]*Session, 16)
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}
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}
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func (m *SessionManager) Get(id uint16) (*Session, bool) {
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m.RLock()
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defer m.RUnlock()
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if m.closed {
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return nil, false
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}
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s, found := m.sessions[id]
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return s, found
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}
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func (m *SessionManager) CloseIfNoSession() bool {
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m.Lock()
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defer m.Unlock()
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if m.closed {
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return true
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}
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if len(m.sessions) != 0 {
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return false
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}
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m.closed = true
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return true
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}
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func (m *SessionManager) Close() error {
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m.Lock()
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defer m.Unlock()
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if m.closed {
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return nil
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}
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m.closed = true
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for _, s := range m.sessions {
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common.Close(s.input)
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common.Close(s.output)
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}
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m.sessions = nil
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return nil
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}
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// Session represents a client connection in a Mux connection.
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type Session struct {
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input buf.Reader
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output buf.Writer
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parent *SessionManager
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ID uint16
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transferType protocol.TransferType
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}
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// Close closes all resources associated with this session.
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func (s *Session) Close() error {
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common.Close(s.output)
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common.Close(s.input)
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s.parent.Remove(s.ID)
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return nil
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}
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// NewReader creates a buf.Reader based on the transfer type of this Session.
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func (s *Session) NewReader(reader *buf.BufferedReader) buf.Reader {
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if s.transferType == protocol.TransferTypeStream {
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return NewStreamReader(reader)
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}
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return NewPacketReader(reader)
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}
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