//go:build !confonly
|
// +build !confonly
|
|
package encoding
|
|
import (
|
"bytes"
|
"context"
|
"io"
|
"net"
|
"time"
|
|
"google.golang.org/grpc/peer"
|
)
|
|
// GunService is the abstract interface of GunService_TunClient and GunService_TunServer
|
type GunService interface {
|
Context() context.Context
|
Send(*Hunk) error
|
Recv() (*Hunk, error)
|
}
|
|
// GunConn implements net.Conn for gun tunnel
|
type GunConn struct {
|
service GunService
|
reader io.Reader
|
over context.CancelFunc
|
local net.Addr
|
remote net.Addr
|
}
|
|
// Read implements net.Conn.Read()
|
func (c *GunConn) Read(b []byte) (n int, err error) {
|
if c.reader == nil {
|
h, err := c.service.Recv()
|
if err != nil {
|
return 0, newError("unable to read from gun tunnel").Base(err)
|
}
|
c.reader = bytes.NewReader(h.Data)
|
}
|
n, err = c.reader.Read(b)
|
if err == io.EOF {
|
c.reader = nil
|
return n, nil
|
}
|
return n, err
|
}
|
|
// Write implements net.Conn.Write()
|
func (c *GunConn) Write(b []byte) (n int, err error) {
|
err = c.service.Send(&Hunk{Data: b})
|
if err != nil {
|
return 0, newError("Unable to send data over gun").Base(err)
|
}
|
return len(b), nil
|
}
|
|
// Close implements net.Conn.Close()
|
func (c *GunConn) Close() error {
|
if c.over != nil {
|
c.over()
|
}
|
return nil
|
}
|
|
// LocalAddr implements net.Conn.LocalAddr()
|
func (c *GunConn) LocalAddr() net.Addr {
|
return c.local
|
}
|
|
// RemoteAddr implements net.Conn.RemoteAddr()
|
func (c *GunConn) RemoteAddr() net.Addr {
|
return c.remote
|
}
|
|
// SetDeadline implements net.Conn.SetDeadline()
|
func (*GunConn) SetDeadline(time.Time) error {
|
return nil
|
}
|
|
// SetReadDeadline implements net.Conn.SetReadDeadline()
|
func (*GunConn) SetReadDeadline(time.Time) error {
|
return nil
|
}
|
|
// SetWriteDeadline implements net.Conn.SetWriteDeadline()
|
func (*GunConn) SetWriteDeadline(time.Time) error {
|
return nil
|
}
|
|
// NewGunConn creates GunConn which handles gun tunnel
|
func NewGunConn(service GunService, over context.CancelFunc) *GunConn {
|
conn := &GunConn{
|
service: service,
|
reader: nil,
|
over: over,
|
}
|
|
conn.local = &net.TCPAddr{
|
IP: []byte{0, 0, 0, 0},
|
Port: 0,
|
}
|
pr, ok := peer.FromContext(service.Context())
|
if ok {
|
conn.remote = pr.Addr
|
} else {
|
conn.remote = &net.TCPAddr{
|
IP: []byte{0, 0, 0, 0},
|
Port: 0,
|
}
|
}
|
|
return conn
|
}
|
