working commit

app/rproxy/rproxy.go

@@ -0,0 +1,125 @@
+package rproxy
+
+import (
+	"context"
+	"errors"
+	"io"
+	"sync"
+
+	"helmet/app/logger"
+)
+
+type Proxy struct {
+	Forwarders []*Forwarder       `json:"forwarders"  yaml:"forwarders"`
+	ctx        context.Context    `json:"-"           yaml:"-"`
+	cancel     context.CancelFunc `json:"-"           yaml:"-"`
+	wg         sync.WaitGroup     `json:"-"           yaml:"-"`
+	log        *logger.Logger     `json:"-"           yaml:"-"`
+}
+
+func NewProxy() *Proxy {
+	ctx, cancel := context.WithCancel(context.Background())
+	return &Proxy{
+		Forwarders: make([]*Forwarder, 0),
+		ctx:        ctx,
+		cancel:     cancel,
+		log:        logger.NewLogger("proxy"),
+	}
+}
+
+func (bal *Proxy) AddForwarder(ctx context.Context, lport, dport uint32, addrs ...string) error {
+	var err error
+	if lport == 0 {
+		return errors.New("Zero lport")
+	}
+	if dport == 0 {
+		return errors.New("Zero dport")
+	}
+	forw, err := NewForwarder(ctx, lport, dport, addrs...)
+	if err != nil {
+		return err
+	}
+	bal.Forwarders = append(bal.Forwarders, forw)
+	bal.wg.Add(1)
+	go forw.Listen(&bal.wg)
+	return err
+}
+
+func (bal *Proxy) DeleteForwarder(ctx context.Context, lport uint32) error {
+	var err error
+	var forw *Forwarder
+	for _, iforw := range bal.Forwarders {
+		if iforw.Lport == lport {
+			forw = iforw
+			break
+		}
+	}
+	if forw == nil {
+		bal.log.Debugf("Forwarder for lport %d not found", lport)
+		return err
+	}
+	bal.log.Debugf("Stop forwarder for lport %d", lport)
+	err = forw.Stop()
+	if err != nil {
+		return err
+	}
+	forwarders := make([]*Forwarder, 0)
+	for _, forw := range bal.Forwarders {
+		if forw.Lport == lport {
+			continue
+		}
+		forwarders = append(forwarders, forw)
+	}
+	bal.Forwarders = forwarders
+	return err
+}
+
+func (bal *Proxy) Start() error {
+	var err error
+	for _, forw := range bal.Forwarders {
+		bal.wg.Add(1)
+		go forw.Listen(&bal.wg)
+	}
+	bal.wg.Wait()
+	return err
+}
+
+func (bal *Proxy) Stop() error {
+	var err error
+	for _, forw := range bal.Forwarders {
+		forw.Stop()
+	}
+	return err
+}
+
+func copy(ctx context.Context, writer io.Writer, reader io.Reader) (int64, error) {
+	var err error
+	var size int64
+	var halt bool
+	buffer := make([]byte, 1024*4)
+	for {
+		select {
+		case <-ctx.Done():
+			err = errors.New("Break copy by context")
+			break
+		default:
+		}
+		rsize, err := reader.Read(buffer)
+		if err == io.EOF {
+			err = nil
+			halt = true
+		}
+		if err != nil {
+			return size, err
+		}
+		wsize, err := writer.Write(buffer[0:rsize])
+		size += int64(wsize)
+		if err != nil {
+			return size, err
+		}
+		if halt {
+			break
+		}
+	}
+	return size, err
+}