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// License: GPLv3 Copyright: 2022, Kovid Goyal, <kovid at kovidgoyal.net>
package at
import (
"bytes"
"errors"
"fmt"
"io"
"net"
"os"
"strconv"
"time"
"github.com/kovidgoyal/kitty/tools/tui/loop"
"github.com/kovidgoyal/kitty/tools/utils"
"github.com/kovidgoyal/kitty/tools/wcswidth"
)
var _ = fmt.Print
func write_all_to_conn(conn *net.Conn, data []byte) error {
for len(data) > 0 {
n, err := (*conn).Write(data)
if err != nil && errors.Is(err, io.ErrShortWrite) {
err = nil
}
if err != nil {
return err
}
data = data[n:]
}
return nil
}
func write_many_to_conn(conn *net.Conn, datums ...[]byte) error {
for len(datums) > 0 {
err := write_all_to_conn(conn, datums[0])
if err != nil {
return err
}
datums = datums[1:]
}
return nil
}
type response_reader struct {
parser wcswidth.EscapeCodeParser
storage [utils.DEFAULT_IO_BUFFER_SIZE]byte
pending_responses [][]byte
}
func (r *response_reader) read_response_from_conn(conn *net.Conn, timeout time.Duration) (serialized_response []byte, err error) {
keep_going := true
if len(r.pending_responses) == 0 {
r.parser.HandleDCS = func(data []byte) error {
if bytes.HasPrefix(data, []byte("@kitty-cmd")) {
r.pending_responses = append(r.pending_responses, append([]byte{}, data[len("@kitty-cmd"):]...))
keep_going = false
}
return nil
}
buf := r.storage[:]
for keep_going {
var n int
(*conn).SetDeadline(time.Now().Add(timeout))
n, err = (*conn).Read(buf)
if err != nil {
keep_going = false
break
}
r.parser.Parse(buf[:n])
}
}
if len(r.pending_responses) > 0 {
serialized_response = r.pending_responses[0]
r.pending_responses = r.pending_responses[1:]
}
return
}
const cmd_escape_code_prefix = "\x1bP@kitty-cmd"
const cmd_escape_code_suffix = "\x1b\\"
func run_stdin_echo_loop(conn *net.Conn, io_data *rc_io_data) (err error) {
lp, err := loop.New(loop.NoAlternateScreen, loop.NoRestoreColors)
if err != nil {
return
}
lp.OnKeyEvent = func(event *loop.KeyEvent) error {
event.Handled = true
err = io_data.on_key_event(lp, event)
if err != nil {
if err == end_reading_from_stdin {
lp.Quit(0)
return nil
}
return err
}
chunk, err := io_data.next_chunk()
if err != nil {
if err == waiting_on_stdin {
return nil
}
return err
}
err = write_many_to_conn(conn, []byte(cmd_escape_code_prefix), chunk, []byte(cmd_escape_code_suffix))
if err != nil {
return err
}
return nil
}
err = lp.Run()
if err == nil {
lp.KillIfSignalled()
}
return err
}
func simple_socket_io(conn *net.Conn, io_data *rc_io_data) (serialized_response []byte, err error) {
r := response_reader{}
r.pending_responses = make([][]byte, 0, 2) // we read at most two responses
first_escape_code_sent := false
wants_streaming := io_data.rc.Stream
for {
var chunk []byte
chunk, err = io_data.next_chunk()
if err != nil {
if err == waiting_on_stdin {
err := run_stdin_echo_loop(conn, io_data)
return make([]byte, 0), err
}
return
}
if len(chunk) == 0 {
break
}
err = write_many_to_conn(conn, []byte(cmd_escape_code_prefix), chunk, []byte(cmd_escape_code_suffix))
if err != nil {
return
}
if !first_escape_code_sent {
first_escape_code_sent = true
if wants_streaming {
var streaming_response []byte
streaming_response, err = r.read_response_from_conn(conn, io_data.timeout)
if err != nil {
return
}
if !is_stream_response(streaming_response) {
err = fmt.Errorf("Did not receive expected streaming response")
return
}
}
}
}
if io_data.rc.NoResponse {
return
}
return r.read_response_from_conn(conn, io_data.timeout)
}
func do_socket_io(io_data *rc_io_data) (serialized_response []byte, err error) {
var conn net.Conn
if global_options.to_network == "fd" {
fd, _ := strconv.Atoi(global_options.to_address)
if err != nil {
return nil, err
}
f := os.NewFile(uintptr(fd), "fd:"+global_options.to_address)
conn, err = net.FileConn(f)
if err != nil {
return nil, fmt.Errorf("Failed to open a socket for the remote control file descriptor: %d with error: %w", fd, err)
}
defer f.Close()
} else {
network := utils.IfElse(global_options.to_network == "ip", "tcp", global_options.to_network)
conn, err = net.Dial(network, global_options.to_address)
if err != nil {
err = fmt.Errorf("Failed to connect to %s:%s with error: %w", network, global_options.to_address, err)
return
}
}
defer conn.Close()
return simple_socket_io(&conn, io_data)
}
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