145 lines
3.8 KiB
Rust
145 lines
3.8 KiB
Rust
use crate::clocks::{WasiMonotonicClock, WasiSystemClock};
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use crate::dir::{DirCaps, DirEntry, WasiDir};
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use crate::file::{FileCaps, FileEntry, WasiFile};
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use crate::string_array::{StringArray, StringArrayError};
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use crate::table::Table;
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use crate::Error;
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use cap_rand::RngCore;
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use std::cell::{RefCell, RefMut};
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use std::path::{Path, PathBuf};
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use std::rc::Rc;
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pub struct WasiCtx {
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pub(crate) args: StringArray,
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pub(crate) env: StringArray,
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pub(crate) random: RefCell<Box<dyn RngCore>>,
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pub(crate) clocks: WasiCtxClocks,
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table: Rc<RefCell<Table>>,
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}
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impl WasiCtx {
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pub fn builder() -> WasiCtxBuilder {
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WasiCtxBuilder(WasiCtx::new())
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}
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pub fn new() -> Self {
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WasiCtx {
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args: StringArray::new(),
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env: StringArray::new(),
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random: RefCell::new(Box::new(unsafe { cap_rand::rngs::OsRng::default() })),
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clocks: WasiCtxClocks::default(),
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table: Rc::new(RefCell::new(Table::new())),
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}
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}
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pub fn insert_file(&self, fd: u32, file: Box<dyn WasiFile>, caps: FileCaps) {
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self.table()
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.insert_at(fd, Box::new(FileEntry::new(caps, file)));
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}
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pub fn insert_dir(
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&self,
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fd: u32,
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dir: Box<dyn WasiDir>,
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caps: DirCaps,
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file_caps: FileCaps,
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path: PathBuf,
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) {
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self.table().insert_at(
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fd,
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Box::new(DirEntry::new(caps, file_caps, Some(path), dir)),
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);
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}
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pub fn table(&self) -> RefMut<Table> {
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self.table.borrow_mut()
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}
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}
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pub struct WasiCtxBuilder(WasiCtx);
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impl WasiCtxBuilder {
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pub fn build(self) -> Result<WasiCtx, Error> {
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Ok(self.0)
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}
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pub fn arg(&mut self, arg: &str) -> Result<&mut Self, StringArrayError> {
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self.0.args.push(arg.to_owned())?;
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Ok(self)
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}
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pub fn stdin(&mut self, f: Box<dyn WasiFile>) -> &mut Self {
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self.0.insert_file(
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0,
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f,
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FileCaps::READ, // XXX fixme: more rights are ok, but this is read-only
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);
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self
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}
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pub fn stdout(&mut self, f: Box<dyn WasiFile>) -> &mut Self {
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self.0.insert_file(
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1,
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f,
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FileCaps::WRITE, // XXX fixme: more rights are ok, but this is append only
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);
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self
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}
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pub fn stderr(&mut self, f: Box<dyn WasiFile>) -> &mut Self {
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self.0.insert_file(
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2,
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f,
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FileCaps::WRITE, // XXX fixme: more rights are ok, but this is append only
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);
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self
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}
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pub fn inherit_stdio(&mut self) -> &mut Self {
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self.stdin(Box::new(crate::stdio::stdin()))
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.stdout(Box::new(crate::stdio::stdout()))
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.stderr(Box::new(crate::stdio::stderr()))
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}
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pub fn preopened_dir(
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&mut self,
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dir: Box<dyn WasiDir>,
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path: impl AsRef<Path>,
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) -> Result<&mut Self, Error> {
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let caps = DirCaps::all();
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let file_caps = FileCaps::all();
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self.0.table().push(Box::new(DirEntry::new(
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caps,
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file_caps,
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Some(path.as_ref().to_owned()),
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dir,
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)))?;
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Ok(self)
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}
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pub fn random(&mut self, random: Box<dyn RngCore>) -> &mut Self {
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self.0.random.replace(random);
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self
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}
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}
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pub struct WasiCtxClocks {
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pub(crate) system: Box<dyn WasiSystemClock>,
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pub(crate) monotonic: Box<dyn WasiMonotonicClock>,
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pub(crate) creation_time: cap_std::time::Instant,
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}
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impl Default for WasiCtxClocks {
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fn default() -> WasiCtxClocks {
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let system = Box::new(unsafe { cap_std::time::SystemClock::new() });
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let monotonic = unsafe { cap_std::time::MonotonicClock::new() };
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let creation_time = monotonic.now();
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let monotonic = Box::new(monotonic);
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WasiCtxClocks {
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system,
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monotonic,
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creation_time,
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}
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}
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}
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