func CmdRender(args []string, stdout, stderr io.Writer, in beam.Receiver, out beam.Sender) {
if len(args) != 2 {
fmt.Fprintf(stderr, "Usage: %s FORMAT\n", args[0])
out.Send(data.Empty().Set("status", "1").Bytes(), nil)
return
}
txt := args[1]
if !strings.HasSuffix(txt, "\n") {
txt += "\n"
}
t := template.Must(template.New("render").Parse(txt))
for {
payload, attachment, err := in.Receive()
if err != nil {
return
}
msg, err := data.Decode(string(payload))
if err != nil {
fmt.Fprintf(stderr, "decode error: %v\n")
}
if err := t.Execute(stdout, msg); err != nil {
fmt.Fprintf(stderr, "rendering error: %v\n", err)
out.Send(data.Empty().Set("status", "1").Bytes(), nil)
return
}
if err := out.Send(payload, attachment); err != nil {
return
}
}
}
func CmdDevnull(args []string, stdout, stderr io.Writer, in beam.Receiver, out beam.Sender) {
for {
_, attachment, err := in.Receive()
if err != nil {
return
}
if attachment != nil {
attachment.Close()
}
}
}
func CmdPass(args []string, stdout, stderr io.Writer, in beam.Receiver, out beam.Sender) {
for {
payload, attachment, err := in.Receive()
if err != nil {
return
}
if err := out.Send(payload, attachment); err != nil {
if attachment != nil {
attachment.Close()
}
return
}
}
}
func CmdConnect(args []string, stdout, stderr io.Writer, in beam.Receiver, out beam.Sender) {
if len(args) != 2 {
out.Send(data.Empty().Set("status", "1").Set("message", "wrong number of arguments").Bytes(), nil)
return
}
u, err := url.Parse(args[1])
if err != nil {
out.Send(data.Empty().Set("status", "1").Set("message", err.Error()).Bytes(), nil)
return
}
var tasks sync.WaitGroup
for {
_, attachment, err := in.Receive()
if err != nil {
break
}
if attachment == nil {
continue
}
Logf("connecting to %s/%s\n", u.Scheme, u.Host)
conn, err := net.Dial(u.Scheme, u.Host)
if err != nil {
out.Send(data.Empty().Set("cmd", "msg", "connect error: "+err.Error()).Bytes(), nil)
return
}
out.Send(data.Empty().Set("cmd", "msg", "connection established").Bytes(), nil)
tasks.Add(1)
go func(attachment *os.File, conn net.Conn) {
defer tasks.Done()
// even when successful, conn.File() returns a duplicate,
// so we must close the original
var iotasks sync.WaitGroup
iotasks.Add(2)
go func(attachment *os.File, conn net.Conn) {
defer iotasks.Done()
io.Copy(attachment, conn)
}(attachment, conn)
go func(attachment *os.File, conn net.Conn) {
defer iotasks.Done()
io.Copy(conn, attachment)
}(attachment, conn)
iotasks.Wait()
conn.Close()
attachment.Close()
}(attachment, conn)
}
tasks.Wait()
}
func SendToConn(connections chan net.Conn, src beam.Receiver) error {
var tasks sync.WaitGroup
defer tasks.Wait()
for {
payload, attachment, err := src.Receive()
if err == io.EOF {
return nil
} else if err != nil {
return err
}
conn, ok := <-connections
if !ok {
break
}
Logf("Sending %s\n", msgDesc(payload, attachment))
tasks.Add(1)
go func(payload []byte, attachment *os.File, conn net.Conn) {
defer tasks.Done()
if _, err := conn.Write([]byte(data.EncodeString(string(payload)))); err != nil {
return
}
if attachment == nil {
conn.Close()
return
}
var iotasks sync.WaitGroup
iotasks.Add(2)
go func(attachment *os.File, conn net.Conn) {
defer iotasks.Done()
Debugf("copying the connection to [%d]\n", attachment.Fd())
io.Copy(attachment, conn)
attachment.Close()
Debugf("done copying the connection to [%d]\n", attachment.Fd())
}(attachment, conn)
go func(attachment *os.File, conn net.Conn) {
defer iotasks.Done()
Debugf("copying [%d] to the connection\n", attachment.Fd())
io.Copy(conn, attachment)
conn.Close()
Debugf("done copying [%d] to the connection\n", attachment.Fd())
}(attachment, conn)
iotasks.Wait()
}(payload, attachment, conn)
}
return nil
}
func CmdPrint(args []string, stdout, stderr io.Writer, in beam.Receiver, out beam.Sender) {
for {
payload, a, err := in.Receive()
if err != nil {
return
}
// Skip commands
if a != nil && data.Message(payload).Get("cmd") == nil {
dup, err := beam.SendRPipe(out, payload)
if err != nil {
a.Close()
return
}
io.Copy(io.MultiWriter(os.Stdout, dup), a)
dup.Close()
} else {
if err := out.Send(payload, a); err != nil {
return
}
}
}
}