wasmer_wasix/syscalls/wasix/sock_send_file.rs
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use virtual_fs::AsyncReadExt;
use super::*;
use crate::{net::socket::TimeType, syscalls::*, WasiInodes};
/// ### `sock_send_file()`
/// Sends the entire contents of a file down a socket
///
/// ## Parameters
///
/// * `in_fd` - Open file that has the data to be transmitted
/// * `offset` - Offset into the file to start reading at
/// * `count` - Number of bytes to be sent
///
/// ## Return
///
/// Number of bytes transmitted.
#[instrument(level = "trace", skip_all, fields(%sock, %in_fd, %offset, %count, nsent = field::Empty), ret)]
pub fn sock_send_file<M: MemorySize>(
mut ctx: FunctionEnvMut<'_, WasiEnv>,
sock: WasiFd,
in_fd: WasiFd,
offset: Filesize,
count: Filesize,
ret_sent: WasmPtr<Filesize, M>,
) -> Result<Errno, WasiError> {
WasiEnv::do_pending_operations(&mut ctx)?;
let total_written = wasi_try_ok!(sock_send_file_internal(
&mut ctx, sock, in_fd, offset, count
)?);
#[cfg(feature = "journal")]
if ctx.data().enable_journal {
JournalEffector::save_sock_send_file::<M>(&mut ctx, sock, in_fd, offset, total_written)
.map_err(|err| {
tracing::error!("failed to save sock_send_file event - {}", err);
WasiError::Exit(ExitCode::from(Errno::Fault))
})?;
}
Span::current().record("nsent", total_written);
let env = ctx.data();
let memory = unsafe { env.memory_view(&ctx) };
wasi_try_mem_ok!(ret_sent.write(&memory, total_written as Filesize));
Ok(Errno::Success)
}
#[allow(clippy::await_holding_lock)]
pub(crate) fn sock_send_file_internal(
ctx: &mut FunctionEnvMut<'_, WasiEnv>,
sock: WasiFd,
in_fd: WasiFd,
offset: Filesize,
mut count: Filesize,
) -> Result<Result<Filesize, Errno>, WasiError> {
let mut env = ctx.data();
let net = env.net();
let tasks = env.tasks().clone();
let state = env.state.clone();
// Set the offset of the file
{
let mut fd_map = state.fs.fd_map.write().unwrap();
let fd_entry = wasi_try_ok_ok!(fd_map.get_mut(in_fd).ok_or(Errno::Badf));
fd_entry.offset.store(offset, Ordering::Release);
}
// Enter a loop that will process all the data
let mut total_written: Filesize = 0;
while (count > 0) {
let sub_count = count.min(4096);
count -= sub_count;
let fd_entry = wasi_try_ok_ok!(state.fs.get_fd(in_fd));
let fd_flags = fd_entry.inner.flags;
let data = {
match in_fd {
__WASI_STDIN_FILENO => {
let mut stdin = wasi_try_ok_ok!(
WasiInodes::stdin_mut(&state.fs.fd_map).map_err(fs_error_into_wasi_err)
);
let data = wasi_try_ok_ok!(__asyncify(ctx, None, async move {
// TODO: optimize with MaybeUninit
let mut buf = vec![0u8; sub_count as usize];
let amt = stdin.read(&mut buf[..]).await.map_err(map_io_err)?;
buf.truncate(amt);
Ok(buf)
})?);
env = ctx.data();
data
}
__WASI_STDOUT_FILENO | __WASI_STDERR_FILENO => return Ok(Err(Errno::Inval)),
_ => {
if !fd_entry.inner.rights.contains(Rights::FD_READ) {
// TODO: figure out the error to return when lacking rights
return Ok(Err(Errno::Access));
}
let offset = fd_entry.inner.offset.load(Ordering::Acquire) as usize;
let inode = fd_entry.inode;
let data = {
let mut guard = inode.write();
match guard.deref_mut() {
Kind::File { handle, .. } => {
if let Some(handle) = handle {
let data =
wasi_try_ok_ok!(__asyncify(ctx, None, async move {
let mut buf = vec![0u8; sub_count as usize];
let mut handle = handle.write().unwrap();
handle
.seek(std::io::SeekFrom::Start(offset as u64))
.await
.map_err(map_io_err)?;
let amt = handle
.read(&mut buf[..])
.await
.map_err(map_io_err)?;
buf.truncate(amt);
Ok(buf)
})?);
env = ctx.data();
data
} else {
return Ok(Err(Errno::Inval));
}
}
Kind::Socket { socket, .. } => {
let socket = socket.clone();
let tasks = tasks.clone();
drop(guard);
let read_timeout = socket
.opt_time(TimeType::WriteTimeout)
.ok()
.flatten()
.unwrap_or(Duration::from_secs(30));
let data = wasi_try_ok_ok!(__asyncify(ctx, None, async {
let mut buf = Vec::with_capacity(sub_count as usize);
unsafe {
buf.set_len(sub_count as usize);
}
socket
.recv(
tasks.deref(),
&mut buf,
Some(read_timeout),
false,
false,
)
.await
.map(|amt| {
unsafe {
buf.set_len(amt);
}
let buf: Vec<u8> = unsafe { std::mem::transmute(buf) };
buf
})
})?);
env = ctx.data();
data
}
Kind::PipeRx { ref mut rx } => {
let data = wasi_try_ok_ok!(__asyncify(ctx, None, async move {
// TODO: optimize with MaybeUninit
let mut buf = vec![0u8; sub_count as usize];
let amt = virtual_fs::AsyncReadExt::read(rx, &mut buf[..])
.await
.map_err(map_io_err)?;
buf.truncate(amt);
Ok(buf)
})?);
env = ctx.data();
data
}
Kind::DuplexPipe { ref mut pipe } => {
let data = wasi_try_ok_ok!(__asyncify(ctx, None, async move {
// TODO: optimize with MaybeUninit
let mut buf = vec![0u8; sub_count as usize];
let amt = virtual_fs::AsyncReadExt::read(pipe, &mut buf[..])
.await
.map_err(map_io_err)?;
buf.truncate(amt);
Ok(buf)
})?);
env = ctx.data();
data
}
Kind::PipeTx { .. }
| Kind::Epoll { .. }
| Kind::EventNotifications { .. } => {
return Ok(Err(Errno::Inval));
}
Kind::Dir { .. } | Kind::Root { .. } => {
return Ok(Err(Errno::Isdir));
}
Kind::Symlink { .. } => unimplemented!("Symlinks in wasi::fd_read"),
Kind::Buffer { buffer } => {
// TODO: optimize with MaybeUninit
let mut buf = vec![0u8; sub_count as usize];
let mut buf_read = &buffer[offset..];
let amt = wasi_try_ok_ok!(std::io::Read::read(
&mut buf_read,
&mut buf[..]
)
.map_err(map_io_err));
buf.truncate(amt);
buf
}
}
};
// reborrow
let mut fd_map = state.fs.fd_map.write().unwrap();
let fd_entry = wasi_try_ok_ok!(fd_map.get_mut(in_fd).ok_or(Errno::Badf));
fd_entry
.offset
.fetch_add(data.len() as u64, Ordering::AcqRel);
data
}
}
};
// Write it down to the socket
let tasks = ctx.data().tasks().clone();
let bytes_written = wasi_try_ok_ok!(__sock_asyncify_mut(
ctx,
sock,
Rights::SOCK_SEND,
|socket, fd| async move {
let write_timeout = socket
.opt_time(TimeType::ReadTimeout)
.ok()
.flatten()
.unwrap_or(Duration::from_secs(30));
socket
.send(tasks.deref(), &data, Some(write_timeout), true)
.await
},
));
env = ctx.data();
total_written += bytes_written as u64;
}
Ok(Ok(total_written))
}