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use crate::{Error, ErrorExt, SystemTimeSpec};
use bitflags::bitflags;
use std::any::Any;
#[wiggle::async_trait]
pub trait WasiFile: Send + Sync {
fn as_any(&self) -> &dyn Any;
async fn get_filetype(&mut self) -> Result<FileType, Error>;
#[cfg(unix)]
fn pollable(&self) -> Option<rustix::fd::BorrowedFd> {
None
}
#[cfg(windows)]
fn pollable(&self) -> Option<io_extras::os::windows::RawHandleOrSocket> {
None
}
fn isatty(&mut self) -> bool {
false
}
async fn sock_accept(&mut self, _fdflags: FdFlags) -> Result<Box<dyn WasiFile>, Error> {
Err(Error::badf())
}
async fn sock_recv<'a>(
&mut self,
_ri_data: &mut [std::io::IoSliceMut<'a>],
_ri_flags: RiFlags,
) -> Result<(u64, RoFlags), Error> {
Err(Error::badf())
}
async fn sock_send<'a>(
&mut self,
_si_data: &[std::io::IoSlice<'a>],
_si_flags: SiFlags,
) -> Result<u64, Error> {
Err(Error::badf())
}
async fn sock_shutdown(&mut self, _how: SdFlags) -> Result<(), Error> {
Err(Error::badf())
}
async fn datasync(&mut self) -> Result<(), Error> {
Ok(())
}
async fn sync(&mut self) -> Result<(), Error> {
Ok(())
}
async fn get_fdflags(&mut self) -> Result<FdFlags, Error> {
Ok(FdFlags::empty())
}
async fn set_fdflags(&mut self, _flags: FdFlags) -> Result<(), Error> {
Err(Error::badf())
}
async fn get_filestat(&mut self) -> Result<Filestat, Error> {
Ok(Filestat {
device_id: 0,
inode: 0,
filetype: self.get_filetype().await?,
nlink: 0,
size: 0,
atim: None,
mtim: None,
ctim: None,
})
}
async fn set_filestat_size(&mut self, _size: u64) -> Result<(), Error> {
Err(Error::badf())
}
async fn advise(&mut self, _offset: u64, _len: u64, _advice: Advice) -> Result<(), Error> {
Err(Error::badf())
}
async fn allocate(&mut self, _offset: u64, _len: u64) -> Result<(), Error> {
Err(Error::badf())
}
async fn set_times(
&mut self,
_atime: Option<SystemTimeSpec>,
_mtime: Option<SystemTimeSpec>,
) -> Result<(), Error> {
Err(Error::badf())
}
async fn read_vectored<'a>(
&mut self,
_bufs: &mut [std::io::IoSliceMut<'a>],
) -> Result<u64, Error> {
Err(Error::badf())
}
async fn read_vectored_at<'a>(
&mut self,
_bufs: &mut [std::io::IoSliceMut<'a>],
_offset: u64,
) -> Result<u64, Error> {
Err(Error::badf())
}
async fn write_vectored<'a>(&mut self, _bufs: &[std::io::IoSlice<'a>]) -> Result<u64, Error> {
Err(Error::badf())
}
async fn write_vectored_at<'a>(
&mut self,
_bufs: &[std::io::IoSlice<'a>],
_offset: u64,
) -> Result<u64, Error> {
Err(Error::badf())
}
async fn seek(&mut self, _pos: std::io::SeekFrom) -> Result<u64, Error> {
Err(Error::badf())
}
async fn peek(&mut self, _buf: &mut [u8]) -> Result<u64, Error> {
Err(Error::badf())
}
async fn num_ready_bytes(&self) -> Result<u64, Error> {
Ok(0)
}
async fn readable(&self) -> Result<(), Error> {
Err(Error::badf())
}
async fn writable(&self) -> Result<(), Error> {
Err(Error::badf())
}
}
#[derive(Debug, Copy, Clone, PartialEq, Eq)]
pub enum FileType {
Unknown,
BlockDevice,
CharacterDevice,
Directory,
RegularFile,
SocketDgram,
SocketStream,
SymbolicLink,
Pipe,
}
bitflags! {
pub struct FdFlags: u32 {
const APPEND = 0b1;
const DSYNC = 0b10;
const NONBLOCK = 0b100;
const RSYNC = 0b1000;
const SYNC = 0b10000;
}
}
bitflags! {
pub struct SdFlags: u32 {
const RD = 0b1;
const WR = 0b10;
}
}
bitflags! {
pub struct SiFlags: u32 {
}
}
bitflags! {
pub struct RiFlags: u32 {
const RECV_PEEK = 0b1;
const RECV_WAITALL = 0b10;
}
}
bitflags! {
pub struct RoFlags: u32 {
const RECV_DATA_TRUNCATED = 0b1;
}
}
bitflags! {
pub struct OFlags: u32 {
const CREATE = 0b1;
const DIRECTORY = 0b10;
const EXCLUSIVE = 0b100;
const TRUNCATE = 0b1000;
}
}
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct Filestat {
pub device_id: u64,
pub inode: u64,
pub filetype: FileType,
pub nlink: u64,
pub size: u64,
pub atim: Option<std::time::SystemTime>,
pub mtim: Option<std::time::SystemTime>,
pub ctim: Option<std::time::SystemTime>,
}
pub(crate) trait TableFileExt {
fn get_file(&self, fd: u32) -> Result<&FileEntry, Error>;
fn get_file_mut(&mut self, fd: u32) -> Result<&mut FileEntry, Error>;
}
impl TableFileExt for crate::table::Table {
fn get_file(&self, fd: u32) -> Result<&FileEntry, Error> {
self.get(fd)
}
fn get_file_mut(&mut self, fd: u32) -> Result<&mut FileEntry, Error> {
self.get_mut(fd)
}
}
pub(crate) struct FileEntry {
caps: FileCaps,
file: Box<dyn WasiFile>,
}
impl FileEntry {
pub fn new(caps: FileCaps, file: Box<dyn WasiFile>) -> Self {
FileEntry { caps, file }
}
pub fn capable_of(&self, caps: FileCaps) -> Result<(), Error> {
if self.caps.contains(caps) {
Ok(())
} else {
let missing = caps & !self.caps;
let err = if missing.intersects(FileCaps::READ | FileCaps::WRITE) {
Error::badf()
} else {
Error::perm()
};
Err(err.context(format!("desired rights {:?}, has {:?}", caps, self.caps)))
}
}
pub fn drop_caps_to(&mut self, caps: FileCaps) -> Result<(), Error> {
self.capable_of(caps)?;
self.caps = caps;
Ok(())
}
pub async fn get_fdstat(&mut self) -> Result<FdStat, Error> {
Ok(FdStat {
filetype: self.file.get_filetype().await?,
caps: self.caps,
flags: self.file.get_fdflags().await?,
})
}
}
pub trait FileEntryExt {
fn get_cap(&self, caps: FileCaps) -> Result<&dyn WasiFile, Error>;
fn get_cap_mut(&mut self, caps: FileCaps) -> Result<&mut dyn WasiFile, Error>;
}
impl FileEntryExt for FileEntry {
fn get_cap(&self, caps: FileCaps) -> Result<&dyn WasiFile, Error> {
self.capable_of(caps)?;
Ok(&*self.file)
}
fn get_cap_mut(&mut self, caps: FileCaps) -> Result<&mut dyn WasiFile, Error> {
self.capable_of(caps)?;
Ok(&mut *self.file)
}
}
bitflags! {
pub struct FileCaps : u32 {
const DATASYNC = 0b1;
const READ = 0b10;
const SEEK = 0b100;
const FDSTAT_SET_FLAGS = 0b1000;
const SYNC = 0b10000;
const TELL = 0b100000;
const WRITE = 0b1000000;
const ADVISE = 0b10000000;
const ALLOCATE = 0b100000000;
const FILESTAT_GET = 0b1000000000;
const FILESTAT_SET_SIZE = 0b10000000000;
const FILESTAT_SET_TIMES = 0b100000000000;
const POLL_READWRITE = 0b1000000000000;
}
}
#[derive(Debug, Clone)]
pub struct FdStat {
pub filetype: FileType,
pub caps: FileCaps,
pub flags: FdFlags,
}
#[derive(Debug, Clone)]
pub enum Advice {
Normal,
Sequential,
Random,
WillNeed,
DontNeed,
NoReuse,
}