/
port_server.go
100 lines (85 loc) · 2.55 KB
/
port_server.go
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package main
import "sync/atomic"
// PortServer will manage TCP forward proxy port listeners
type PortServer struct {
PortDB *PortDatabase
Listeners map[uint16]*PortListener
Log *Log
CurrentVersion int
}
// NewPortServer will create and return a new server
func NewPortServer(filename string, log *Log) (*PortServer, error) {
db, err := NewPortDatabase(filename)
if err != nil {
return nil, err
}
server := &PortServer{
PortDB: db,
Log: log,
Listeners: make(map[uint16]*PortListener),
}
log.Infof("found %d port(s) in database %s", len(server.PortDB.db), filename)
err = server.refreshListeners()
if err != nil {
return nil, err
}
return server, nil
}
// ReloadPorts will load the file,
func (server *PortServer) ReloadPorts() {
err := server.PortDB.Load()
if err != nil {
server.Log.Errorf("ReloadPorts, load: %s", err)
}
err = server.refreshListeners()
if err != nil {
server.Log.Errorf("ReloadPorts, refresh: %s", err)
}
}
// GetTotalConnections return the total connection count for all listeners
func (server *PortServer) GetTotalConnections() int {
total := 0
for _, l := range server.Listeners {
total += int(atomic.LoadInt32(&l.ConnectionCount))
}
return total
}
// sync listeners and update forward maps
func (server *PortServer) refreshListeners() error {
var err error
server.PortDB.mutex.Lock()
defer server.PortDB.mutex.Unlock()
server.CurrentVersion++
for portNum, portConf := range server.PortDB.db {
listener, exists := server.Listeners[portNum]
if !exists {
server.Log.Infof("port proxy: opening port %s", portConf.ListenAddr.String())
listener, err = NewPortListener(portConf.ListenAddr, portConf.Forwards, server.CurrentVersion, server.Log)
if err != nil {
server.Log.Errorf("unable to listen on port %d: %s", portNum, err)
continue
}
server.Listeners[portNum] = listener
} else {
listener.version = server.CurrentVersion
err := listener.UpdateForwardMap(portConf.Forwards)
if err != nil {
server.Log.Errorf("unable to update port %d: %s", portNum, err)
}
}
}
// delete unused listeners
for portNum, listener := range server.Listeners {
if listener.version != server.CurrentVersion {
server.Log.Infof("port proxy: closing port %d", portNum)
err := listener.Close()
if err != nil {
server.Log.Errorf("unable to close port %d: %s", portNum, err)
} else {
delete(server.Listeners, portNum)
}
}
}
server.Log.Infof("refresh: %d port(s) - %d connection(s)", len(server.Listeners), server.GetTotalConnections())
return nil
}