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use crate::clocks::WasiClocks;
use crate::dir::{DirCaps, DirEntry, WasiDir};
use crate::file::{FileCaps, FileEntry, WasiFile};
use crate::sched::WasiSched;
use crate::string_array::{StringArray, StringArrayError};
use crate::table::Table;
use crate::Error;
use cap_rand::RngCore;
use std::path::{Path, PathBuf};
pub struct WasiCtx {
pub args: StringArray,
pub env: StringArray,
pub random: Box<dyn RngCore + Send + Sync>,
pub clocks: WasiClocks,
pub sched: Box<dyn WasiSched>,
pub table: Table,
}
impl WasiCtx {
pub fn new(
random: Box<dyn RngCore + Send + Sync>,
clocks: WasiClocks,
sched: Box<dyn WasiSched>,
table: Table,
) -> Self {
let mut s = WasiCtx {
args: StringArray::new(),
env: StringArray::new(),
random,
clocks,
sched,
table,
};
s.set_stdin(Box::new(crate::pipe::ReadPipe::new(std::io::empty())));
s.set_stdout(Box::new(crate::pipe::WritePipe::new(std::io::sink())));
s.set_stderr(Box::new(crate::pipe::WritePipe::new(std::io::sink())));
s
}
pub fn insert_file(&mut self, fd: u32, file: Box<dyn WasiFile>, caps: FileCaps) {
self.table()
.insert_at(fd, Box::new(FileEntry::new(caps, file)));
}
pub fn insert_dir(
&mut self,
fd: u32,
dir: Box<dyn WasiDir>,
caps: DirCaps,
file_caps: FileCaps,
path: PathBuf,
) {
self.table().insert_at(
fd,
Box::new(DirEntry::new(caps, file_caps, Some(path), dir)),
);
}
pub fn table(&mut self) -> &mut Table {
&mut self.table
}
pub fn push_arg(&mut self, arg: &str) -> Result<(), StringArrayError> {
self.args.push(arg.to_owned())
}
pub fn push_env(&mut self, var: &str, value: &str) -> Result<(), StringArrayError> {
self.env.push(format!("{}={}", var, value))?;
Ok(())
}
pub fn set_stdin(&mut self, mut f: Box<dyn WasiFile>) {
let rights = Self::stdio_rights(&mut *f);
self.insert_file(0, f, rights);
}
pub fn set_stdout(&mut self, mut f: Box<dyn WasiFile>) {
let rights = Self::stdio_rights(&mut *f);
self.insert_file(1, f, rights);
}
pub fn set_stderr(&mut self, mut f: Box<dyn WasiFile>) {
let rights = Self::stdio_rights(&mut *f);
self.insert_file(2, f, rights);
}
fn stdio_rights(f: &mut dyn WasiFile) -> FileCaps {
let mut rights = FileCaps::all();
if f.isatty() {
rights &= !(FileCaps::TELL | FileCaps::SEEK);
}
rights
}
pub fn push_preopened_dir(
&mut self,
dir: Box<dyn WasiDir>,
path: impl AsRef<Path>,
) -> Result<(), Error> {
let caps = DirCaps::all();
let file_caps = FileCaps::all();
self.table().push(Box::new(DirEntry::new(
caps,
file_caps,
Some(path.as_ref().to_owned()),
dir,
)))?;
Ok(())
}
}