7a1b7cdf92
Implement Wasmtime's new API as designed by RFC 11. This is quite a large commit which has had lots of discussion externally, so for more information it's best to read the RFC thread and the PR thread.
113 lines
3.3 KiB
Rust
113 lines
3.3 KiB
Rust
mod dir;
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mod file;
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pub mod sched;
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pub mod stdio;
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use std::future::Future;
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use std::path::Path;
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pub use wasi_cap_std_sync::{clocks_ctx, random_ctx};
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use wasi_common::{Error, Table, WasiCtx, WasiFile};
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pub use dir::Dir;
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pub use file::File;
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use crate::sched::sched_ctx;
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pub struct WasiCtxBuilder(WasiCtx);
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impl WasiCtxBuilder {
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pub fn new() -> Self {
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WasiCtxBuilder(WasiCtx::new(
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random_ctx(),
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clocks_ctx(),
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sched_ctx(),
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Table::new(),
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))
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}
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pub fn env(mut self, var: &str, value: &str) -> Result<Self, wasi_common::StringArrayError> {
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self.0.push_env(var, value)?;
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Ok(self)
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}
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pub fn envs(mut self, env: &[(String, String)]) -> Result<Self, wasi_common::StringArrayError> {
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for (k, v) in env {
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self.0.push_env(k, v)?;
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}
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Ok(self)
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}
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pub fn inherit_env(mut self) -> Result<Self, wasi_common::StringArrayError> {
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for (key, value) in std::env::vars() {
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self.0.push_env(&key, &value)?;
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}
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Ok(self)
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}
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pub fn arg(mut self, arg: &str) -> Result<Self, wasi_common::StringArrayError> {
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self.0.push_arg(arg)?;
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Ok(self)
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}
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pub fn args(mut self, arg: &[String]) -> Result<Self, wasi_common::StringArrayError> {
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for a in arg {
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self.0.push_arg(&a)?;
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}
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Ok(self)
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}
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pub fn inherit_args(mut self) -> Result<Self, wasi_common::StringArrayError> {
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for arg in std::env::args() {
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self.0.push_arg(&arg)?;
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}
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Ok(self)
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}
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pub fn stdin(mut self, f: Box<dyn WasiFile>) -> Self {
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self.0.set_stdin(f);
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self
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}
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pub fn stdout(mut self, f: Box<dyn WasiFile>) -> Self {
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self.0.set_stdout(f);
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self
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}
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pub fn stderr(mut self, f: Box<dyn WasiFile>) -> Self {
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self.0.set_stderr(f);
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self
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}
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pub fn inherit_stdin(self) -> Self {
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self.stdin(Box::new(crate::stdio::stdin()))
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}
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pub fn inherit_stdout(self) -> Self {
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self.stdout(Box::new(crate::stdio::stdout()))
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}
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pub fn inherit_stderr(self) -> Self {
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self.stderr(Box::new(crate::stdio::stderr()))
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}
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pub fn inherit_stdio(self) -> Self {
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self.inherit_stdin().inherit_stdout().inherit_stderr()
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}
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pub fn preopened_dir(
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mut self,
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dir: cap_std::fs::Dir,
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guest_path: impl AsRef<Path>,
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) -> Result<Self, Error> {
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let dir = Box::new(crate::dir::Dir::from_cap_std(dir));
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self.0.push_preopened_dir(dir, guest_path)?;
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Ok(self)
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}
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pub fn build(self) -> WasiCtx {
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self.0
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}
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}
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// Much of this crate is implemented in terms of `async` methods from the
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// wasi-cap-std-sync crate. These methods may be async in signature, however,
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// they are synchronous in implementation (always Poll::Ready on first poll)
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// and perform blocking syscalls.
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//
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// This function takes this blocking code and executes it using a dummy executor
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// to assert its immediate readiness. We tell tokio this is a blocking operation
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// with the block_in_place function.
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pub(crate) fn block_on_dummy_executor<'a, F, Fut, T>(f: F) -> Result<T, Error>
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where
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F: FnOnce() -> Fut + Send + 'a,
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Fut: Future<Output = Result<T, Error>>,
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T: Send + 'static,
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{
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tokio::task::block_in_place(move || wiggle::run_in_dummy_executor(f()))
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}
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