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use std::env;
use std::os::unix::io::RawFd;
use std::path::PathBuf;
use std::process::{Child, Command};
use std::sync::{Arc, Mutex};
use zellij_utils::{async_std, interprocess, libc, nix, signal_hook, zellij_tile};
use async_std::fs::File as AsyncFile;
use async_std::os::unix::io::FromRawFd;
use interprocess::local_socket::LocalSocketStream;
use nix::pty::{forkpty, Winsize};
use nix::sys::signal::{kill, Signal};
use nix::sys::termios;
use nix::sys::wait::waitpid;
use nix::unistd::{self, ForkResult};
use signal_hook::consts::*;
use zellij_tile::data::Palette;
use zellij_utils::{
errors::ErrorContext,
ipc::{
ClientToServerMsg, ExitReason, IpcReceiverWithContext, IpcSenderWithContext,
ServerToClientMsg,
},
shared::default_palette,
};
use async_std::io::ReadExt;
pub use async_trait::async_trait;
pub use nix::unistd::Pid;
pub(crate) fn set_terminal_size_using_fd(fd: RawFd, columns: u16, rows: u16) {
use libc::ioctl;
use libc::TIOCSWINSZ;
let winsize = Winsize {
ws_col: columns,
ws_row: rows,
ws_xpixel: 0,
ws_ypixel: 0,
};
#[allow(clippy::useless_conversion)]
unsafe {
ioctl(fd, TIOCSWINSZ.into(), &winsize)
};
}
fn handle_command_exit(mut child: Child) {
let mut signals = signal_hook::iterator::Signals::new(&[SIGINT]).unwrap();
'handle_exit: loop {
match child.try_wait() {
Ok(Some(_status)) => {
break 'handle_exit;
}
Ok(None) => {
::std::thread::sleep(::std::time::Duration::from_millis(100));
}
Err(e) => panic!("error attempting to wait: {}", e),
}
for signal in signals.pending() {
if let SIGINT = signal {
child.kill().unwrap();
child.wait().unwrap();
break 'handle_exit;
}
}
}
}
fn spawn_terminal(file_to_open: Option<PathBuf>, orig_termios: termios::Termios) -> (RawFd, Pid) {
let (pid_primary, pid_secondary): (RawFd, Pid) = {
match forkpty(None, Some(&orig_termios)) {
Ok(fork_pty_res) => {
let pid_primary = fork_pty_res.master;
let pid_secondary = match fork_pty_res.fork_result {
ForkResult::Parent { child } => {
child
}
ForkResult::Child => match file_to_open {
Some(file_to_open) => {
if env::var("EDITOR").is_err() && env::var("VISUAL").is_err() {
panic!("Can't edit files if an editor is not defined. To fix: define the EDITOR or VISUAL environment variables with the path to your editor (eg. /usr/bin/vim)");
}
let editor =
env::var("EDITOR").unwrap_or_else(|_| env::var("VISUAL").unwrap());
let child = Command::new(editor)
.args(&[file_to_open])
.spawn()
.expect("failed to spawn");
handle_command_exit(child);
::std::process::exit(0);
}
None => {
let child = Command::new(env::var("SHELL").unwrap())
.spawn()
.expect("failed to spawn");
handle_command_exit(child);
::std::process::exit(0);
}
},
};
(pid_primary, pid_secondary)
}
Err(e) => {
panic!("failed to fork {:?}", e);
}
}
};
(pid_primary, pid_secondary)
}
#[derive(Clone)]
pub struct ServerOsInputOutput {
orig_termios: Arc<Mutex<termios::Termios>>,
receive_instructions_from_client: Option<Arc<Mutex<IpcReceiverWithContext<ClientToServerMsg>>>>,
send_instructions_to_client: Arc<Mutex<Option<IpcSenderWithContext<ServerToClientMsg>>>>,
}
#[async_trait]
pub trait AsyncReader: Send + Sync {
async fn read(&mut self, buf: &mut [u8]) -> Result<usize, std::io::Error>;
}
struct RawFdAsyncReader {
fd: async_std::fs::File,
}
impl RawFdAsyncReader {
fn new(fd: RawFd) -> RawFdAsyncReader {
RawFdAsyncReader {
fd: unsafe { AsyncFile::from_raw_fd(fd) },
}
}
}
#[async_trait]
impl AsyncReader for RawFdAsyncReader {
async fn read(&mut self, buf: &mut [u8]) -> Result<usize, std::io::Error> {
self.fd.read(buf).await
}
}
pub trait ServerOsApi: Send + Sync {
fn set_terminal_size_using_fd(&self, fd: RawFd, cols: u16, rows: u16);
fn spawn_terminal(&self, file_to_open: Option<PathBuf>) -> (RawFd, Pid);
fn read_from_tty_stdout(&self, fd: RawFd, buf: &mut [u8]) -> Result<usize, nix::Error>;
fn async_file_reader(&self, fd: RawFd) -> Box<dyn AsyncReader>;
fn write_to_tty_stdin(&self, fd: RawFd, buf: &[u8]) -> Result<usize, nix::Error>;
fn tcdrain(&self, fd: RawFd) -> Result<(), nix::Error>;
fn kill(&self, pid: Pid) -> Result<(), nix::Error>;
fn box_clone(&self) -> Box<dyn ServerOsApi>;
fn recv_from_client(&self) -> (ClientToServerMsg, ErrorContext);
fn send_to_client(&self, msg: ServerToClientMsg);
fn add_client_sender(&self);
fn send_to_temp_client(&self, msg: ServerToClientMsg);
fn remove_client_sender(&self);
fn update_receiver(&mut self, stream: LocalSocketStream);
fn load_palette(&self) -> Palette;
}
impl ServerOsApi for ServerOsInputOutput {
fn set_terminal_size_using_fd(&self, fd: RawFd, cols: u16, rows: u16) {
set_terminal_size_using_fd(fd, cols, rows);
}
fn spawn_terminal(&self, file_to_open: Option<PathBuf>) -> (RawFd, Pid) {
let orig_termios = self.orig_termios.lock().unwrap();
spawn_terminal(file_to_open, orig_termios.clone())
}
fn read_from_tty_stdout(&self, fd: RawFd, buf: &mut [u8]) -> Result<usize, nix::Error> {
unistd::read(fd, buf)
}
fn async_file_reader(&self, fd: RawFd) -> Box<dyn AsyncReader> {
Box::new(RawFdAsyncReader::new(fd))
}
fn write_to_tty_stdin(&self, fd: RawFd, buf: &[u8]) -> Result<usize, nix::Error> {
unistd::write(fd, buf)
}
fn tcdrain(&self, fd: RawFd) -> Result<(), nix::Error> {
termios::tcdrain(fd)
}
fn box_clone(&self) -> Box<dyn ServerOsApi> {
Box::new((*self).clone())
}
fn kill(&self, pid: Pid) -> Result<(), nix::Error> {
kill(pid, Some(Signal::SIGKILL)).unwrap();
waitpid(pid, None).unwrap();
Ok(())
}
fn recv_from_client(&self) -> (ClientToServerMsg, ErrorContext) {
self.receive_instructions_from_client
.as_ref()
.unwrap()
.lock()
.unwrap()
.recv()
}
fn send_to_client(&self, msg: ServerToClientMsg) {
self.send_instructions_to_client
.lock()
.unwrap()
.as_mut()
.unwrap()
.send(msg);
}
fn add_client_sender(&self) {
let sender = self
.receive_instructions_from_client
.as_ref()
.unwrap()
.lock()
.unwrap()
.get_sender();
let old_sender = self
.send_instructions_to_client
.lock()
.unwrap()
.replace(sender);
if let Some(mut sender) = old_sender {
sender.send(ServerToClientMsg::Exit(ExitReason::ForceDetached));
}
}
fn send_to_temp_client(&self, msg: ServerToClientMsg) {
self.receive_instructions_from_client
.as_ref()
.unwrap()
.lock()
.unwrap()
.get_sender()
.send(msg);
}
fn remove_client_sender(&self) {
assert!(self.send_instructions_to_client.lock().unwrap().is_some());
*self.send_instructions_to_client.lock().unwrap() = None;
}
fn update_receiver(&mut self, stream: LocalSocketStream) {
self.receive_instructions_from_client =
Some(Arc::new(Mutex::new(IpcReceiverWithContext::new(stream))));
}
fn load_palette(&self) -> Palette {
default_palette()
}
}
impl Clone for Box<dyn ServerOsApi> {
fn clone(&self) -> Box<dyn ServerOsApi> {
self.box_clone()
}
}
pub fn get_server_os_input() -> Result<ServerOsInputOutput, nix::Error> {
let current_termios = termios::tcgetattr(0)?;
let orig_termios = Arc::new(Mutex::new(current_termios));
Ok(ServerOsInputOutput {
orig_termios,
receive_instructions_from_client: None,
send_instructions_to_client: Arc::new(Mutex::new(None)),
})
}