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client.go
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client.go
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package fdrpc
import (
"bufio"
"encoding/gob"
"fmt"
"net"
"syscall"
"github.com/flynn/rpcplus"
)
type FD struct {
FD int
}
type FDReader struct {
conn *net.UnixConn
FDs map[int]int
fdCount int
}
func NewFDReader(conn *net.UnixConn) *FDReader {
return &FDReader{conn, make(map[int]int), 0}
}
func (r *FDReader) Close() error {
return r.conn.Close()
}
func (r *FDReader) Read(b []byte) (int, error) {
oob := make([]byte, 32)
n, oobn, _, _, err := r.conn.ReadMsgUnix(b, oob)
if err != nil {
if n < 0 {
n = 0
}
return n, err
}
if oobn > 0 {
messages, err := syscall.ParseSocketControlMessage(oob[:oobn])
if err != nil {
return n, err
}
for _, m := range messages {
fds, err := syscall.ParseUnixRights(&m)
if err != nil {
return n, err
}
// Set the CLOEXEC flag on the FDs so they won't be leaked into future forks
for _, fd := range fds {
if _, _, errno := syscall.Syscall(syscall.SYS_FCNTL, uintptr(fd), syscall.F_SETFD, syscall.FD_CLOEXEC); errno != 0 {
return n, errno
}
r.FDs[r.fdCount] = fd
r.fdCount++
}
}
}
return n, nil
}
func (r *FDReader) Write(b []byte) (int, error) {
return r.conn.Write(b)
}
func (r *FDReader) GetFD(index int) (int, error) {
fd, ok := r.FDs[index]
if !ok {
return -1, fmt.Errorf("No received FD with index %d\n", index)
}
delete(r.FDs, index)
return fd, nil
}
type gobClientCodec struct {
fdReader *FDReader
dec *gob.Decoder
enc *gob.Encoder
encBuf *bufio.Writer
}
func (c *gobClientCodec) WriteRequest(r *rpcplus.Request, body interface{}) (err error) {
if err = c.enc.Encode(r); err != nil {
return
}
if err = c.enc.Encode(body); err != nil {
return
}
return c.encBuf.Flush()
}
func (c *gobClientCodec) ReadResponseHeader(r *rpcplus.Response) error {
return c.dec.Decode(r)
}
func (c *gobClientCodec) ReadResponseBody(body interface{}) error {
if err := c.dec.Decode(body); err != nil {
return err
}
var err error
switch f := body.(type) {
case *FD:
f.FD, err = c.fdReader.GetFD(f.FD)
if err != nil {
return err
}
case *[]FD:
for i, fd := range *f {
(*f)[i].FD, err = c.fdReader.GetFD(fd.FD)
if err != nil {
return err
}
}
}
return nil
}
func (c *gobClientCodec) Close() error {
return c.fdReader.Close()
}
func NewClient(conn *net.UnixConn) *rpcplus.Client {
fdReader := NewFDReader(conn)
encBuf := bufio.NewWriter(fdReader)
client := &gobClientCodec{fdReader, gob.NewDecoder(fdReader), gob.NewEncoder(encBuf), encBuf}
return rpcplus.NewClientWithCodec(client)
}
func Dial(path string) (*rpcplus.Client, error) {
conn, err := net.DialUnix("unix", nil, &net.UnixAddr{Net: "unix", Name: path})
if err != nil {
return nil, err
}
return NewClient(conn), nil
}