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denoland-deno/runtime/ops/tty.rs

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2021-01-10 21:59:07 -05:00
// Copyright 2018-2021 the Deno authors. All rights reserved. MIT license.
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use super::io::StdFileResource;
use deno_core::error::bad_resource_id;
use deno_core::error::not_supported;
use deno_core::error::resource_unavailable;
use deno_core::error::AnyError;
use deno_core::serde_json;
use deno_core::serde_json::json;
use deno_core::serde_json::Value;
use deno_core::OpState;
use deno_core::RcRef;
use deno_core::ZeroCopyBuf;
use serde::Deserialize;
use serde::Serialize;
use std::io::Error;
#[cfg(unix)]
use nix::sys::termios;
#[cfg(windows)]
use deno_core::error::custom_error;
#[cfg(windows)]
use winapi::shared::minwindef::DWORD;
#[cfg(windows)]
use winapi::um::wincon;
#[cfg(windows)]
const RAW_MODE_MASK: DWORD = wincon::ENABLE_LINE_INPUT
| wincon::ENABLE_ECHO_INPUT
| wincon::ENABLE_PROCESSED_INPUT;
#[cfg(windows)]
fn get_windows_handle(
f: &std::fs::File,
) -> Result<std::os::windows::io::RawHandle, AnyError> {
use std::os::windows::io::AsRawHandle;
use winapi::um::handleapi;
let handle = f.as_raw_handle();
if handle == handleapi::INVALID_HANDLE_VALUE {
return Err(Error::last_os_error().into());
} else if handle.is_null() {
return Err(custom_error("ReferenceError", "null handle"));
}
Ok(handle)
}
pub fn init(rt: &mut deno_core::JsRuntime) {
super::reg_json_sync(rt, "op_set_raw", op_set_raw);
super::reg_json_sync(rt, "op_isatty", op_isatty);
super::reg_json_sync(rt, "op_console_size", op_console_size);
}
#[derive(Deserialize)]
#[serde(rename_all = "camelCase")]
struct SetRawOptions {
cbreak: bool,
}
#[derive(Deserialize)]
struct SetRawArgs {
rid: u32,
mode: bool,
options: SetRawOptions,
}
fn op_set_raw(
state: &mut OpState,
args: Value,
_zero_copy: &mut [ZeroCopyBuf],
) -> Result<Value, AnyError> {
super::check_unstable(state, "Deno.setRaw");
let args: SetRawArgs = serde_json::from_value(args)?;
let rid = args.rid;
let is_raw = args.mode;
let cbreak = args.options.cbreak;
// From https://github.com/kkawakam/rustyline/blob/master/src/tty/windows.rs
// and https://github.com/kkawakam/rustyline/blob/master/src/tty/unix.rs
// and https://github.com/crossterm-rs/crossterm/blob/e35d4d2c1cc4c919e36d242e014af75f6127ab50/src/terminal/sys/windows.rs
// Copyright (c) 2015 Katsu Kawakami & Rustyline authors. MIT license.
// Copyright (c) 2019 Timon. MIT license.
#[cfg(windows)]
{
use std::os::windows::io::AsRawHandle;
use winapi::shared::minwindef::FALSE;
use winapi::um::{consoleapi, handleapi};
let resource = state
.resource_table
.get::<StdFileResource>(rid)
.ok_or_else(bad_resource_id)?;
if cbreak {
return Err(not_supported());
}
if resource.fs_file.is_none() {
return Err(bad_resource_id());
}
let fs_file_resource =
RcRef::map(&resource, |r| r.fs_file.as_ref().unwrap()).try_borrow_mut();
let handle_result = if let Some(mut fs_file) = fs_file_resource {
let tokio_file = fs_file.0.take().unwrap();
match tokio_file.try_into_std() {
Ok(std_file) => {
let raw_handle = std_file.as_raw_handle();
// Turn the std_file handle back into a tokio file, put it back
// in the resource table.
let tokio_file = tokio::fs::File::from_std(std_file);
fs_file.0 = Some(tokio_file);
// return the result.
Ok(raw_handle)
}
Err(tokio_file) => {
// This function will return an error containing the file if
// some operation is in-flight.
fs_file.0 = Some(tokio_file);
Err(resource_unavailable())
}
}
} else {
Err(resource_unavailable())
};
let handle = handle_result?;
if handle == handleapi::INVALID_HANDLE_VALUE {
return Err(Error::last_os_error().into());
} else if handle.is_null() {
return Err(custom_error("ReferenceError", "null handle"));
}
let mut original_mode: DWORD = 0;
if unsafe { consoleapi::GetConsoleMode(handle, &mut original_mode) }
== FALSE
{
return Err(Error::last_os_error().into());
}
let new_mode = if is_raw {
original_mode & !RAW_MODE_MASK
} else {
original_mode | RAW_MODE_MASK
};
if unsafe { consoleapi::SetConsoleMode(handle, new_mode) } == FALSE {
return Err(Error::last_os_error().into());
}
Ok(json!({}))
}
#[cfg(unix)]
{
use std::os::unix::io::AsRawFd;
let resource = state
.resource_table
.get::<StdFileResource>(rid)
.ok_or_else(bad_resource_id)?;
if resource.fs_file.is_none() {
return Err(not_supported());
}
let maybe_fs_file_resource =
RcRef::map(&resource, |r| r.fs_file.as_ref().unwrap()).try_borrow_mut();
if maybe_fs_file_resource.is_none() {
return Err(resource_unavailable());
}
let mut fs_file_resource = maybe_fs_file_resource.unwrap();
if fs_file_resource.0.is_none() {
return Err(resource_unavailable());
}
let raw_fd = fs_file_resource.0.as_ref().unwrap().as_raw_fd();
let maybe_tty_mode = &mut fs_file_resource.1.as_mut().unwrap().tty.mode;
if is_raw {
if maybe_tty_mode.is_none() {
// Save original mode.
let original_mode = termios::tcgetattr(raw_fd)?;
maybe_tty_mode.replace(original_mode);
}
let mut raw = maybe_tty_mode.clone().unwrap();
raw.input_flags &= !(termios::InputFlags::BRKINT
| termios::InputFlags::ICRNL
| termios::InputFlags::INPCK
| termios::InputFlags::ISTRIP
| termios::InputFlags::IXON);
raw.control_flags |= termios::ControlFlags::CS8;
raw.local_flags &= !(termios::LocalFlags::ECHO
| termios::LocalFlags::ICANON
| termios::LocalFlags::IEXTEN);
if !cbreak {
raw.local_flags &= !(termios::LocalFlags::ISIG);
}
raw.control_chars[termios::SpecialCharacterIndices::VMIN as usize] = 1;
raw.control_chars[termios::SpecialCharacterIndices::VTIME as usize] = 0;
termios::tcsetattr(raw_fd, termios::SetArg::TCSADRAIN, &raw)?;
} else {
// Try restore saved mode.
if let Some(mode) = maybe_tty_mode.take() {
termios::tcsetattr(raw_fd, termios::SetArg::TCSADRAIN, &mode)?;
}
}
Ok(json!({}))
}
}
#[derive(Deserialize)]
struct IsattyArgs {
rid: u32,
}
fn op_isatty(
state: &mut OpState,
args: Value,
_zero_copy: &mut [ZeroCopyBuf],
) -> Result<Value, AnyError> {
let args: IsattyArgs = serde_json::from_value(args)?;
let rid = args.rid;
let isatty: bool =
StdFileResource::with(state, rid as u32, move |r| match r {
Ok(std_file) => {
#[cfg(windows)]
{
use winapi::um::consoleapi;
let handle = get_windows_handle(&std_file)?;
let mut test_mode: DWORD = 0;
// If I cannot get mode out of console, it is not a console.
Ok(unsafe { consoleapi::GetConsoleMode(handle, &mut test_mode) != 0 })
}
#[cfg(unix)]
{
use std::os::unix::io::AsRawFd;
let raw_fd = std_file.as_raw_fd();
Ok(unsafe { libc::isatty(raw_fd as libc::c_int) == 1 })
}
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}
_ => Ok(false),
})?;
Ok(json!(isatty))
}
#[derive(Deserialize)]
struct ConsoleSizeArgs {
rid: u32,
}
#[derive(Serialize)]
struct ConsoleSize {
columns: u32,
rows: u32,
}
fn op_console_size(
state: &mut OpState,
args: Value,
_zero_copy: &mut [ZeroCopyBuf],
) -> Result<Value, AnyError> {
super::check_unstable(state, "Deno.consoleSize");
let args: ConsoleSizeArgs = serde_json::from_value(args)?;
let rid = args.rid;
let size = StdFileResource::with(state, rid as u32, move |r| match r {
Ok(std_file) => {
#[cfg(windows)]
{
use std::os::windows::io::AsRawHandle;
let handle = std_file.as_raw_handle();
unsafe {
let mut bufinfo: winapi::um::wincon::CONSOLE_SCREEN_BUFFER_INFO =
std::mem::zeroed();
if winapi::um::wincon::GetConsoleScreenBufferInfo(
handle,
&mut bufinfo,
) == 0
{
return Err(Error::last_os_error().into());
}
Ok(ConsoleSize {
columns: bufinfo.dwSize.X as u32,
rows: bufinfo.dwSize.Y as u32,
})
}
}
#[cfg(unix)]
{
use std::os::unix::io::AsRawFd;
let fd = std_file.as_raw_fd();
unsafe {
let mut size: libc::winsize = std::mem::zeroed();
if libc::ioctl(fd, libc::TIOCGWINSZ, &mut size as *mut _) != 0 {
return Err(Error::last_os_error().into());
}
// TODO (caspervonb) return a tuple instead
Ok(ConsoleSize {
columns: size.ws_col as u32,
rows: size.ws_row as u32,
})
}
}
}
Err(_) => Err(bad_resource_id()),
})?;
Ok(json!(size))
}