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use std::fmt;
use std::ops::Deref;
use std::sync::atomic::{AtomicU32, Ordering};
use thiserror::Error;
use wasmer_vbus::{UnsupportedVirtualBus, VirtualBus};
use wasmer_vnet::VirtualNetworking;
use wasmer_wasi_types::wasi::Errno;
use super::WasiError;
use super::WasiThreadId;
#[derive(Error, Debug)]
pub enum WasiThreadError {
#[error("Multithreading is not supported")]
Unsupported,
#[error("The method named is not an exported function")]
MethodNotFound,
}
impl From<WasiThreadError> for Errno {
fn from(a: WasiThreadError) -> Errno {
match a {
WasiThreadError::Unsupported => Errno::Notsup,
WasiThreadError::MethodNotFound => Errno::Inval,
}
}
}
#[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord)]
pub struct WasiTtyState {
pub cols: u32,
pub rows: u32,
pub width: u32,
pub height: u32,
pub stdin_tty: bool,
pub stdout_tty: bool,
pub stderr_tty: bool,
pub echo: bool,
pub line_buffered: bool,
}
pub trait WasiRuntimeImplementation: fmt::Debug + Sync {
fn bus(&self) -> &(dyn VirtualBus);
fn networking(&self) -> &(dyn VirtualNetworking);
fn thread_generate_id(&self) -> WasiThreadId;
fn tty_get(&self) -> WasiTtyState {
WasiTtyState {
rows: 25,
cols: 80,
width: 800,
height: 600,
stdin_tty: false,
stdout_tty: false,
stderr_tty: false,
echo: true,
line_buffered: true,
}
}
fn tty_set(&self, _tty_state: WasiTtyState) {}
fn thread_spawn(
&self,
_callback: Box<dyn FnOnce() + Send + 'static>,
) -> Result<(), WasiThreadError> {
Err(WasiThreadError::Unsupported)
}
fn thread_parallelism(&self) -> Result<usize, WasiThreadError> {
Err(WasiThreadError::Unsupported)
}
fn yield_now(&self, _id: WasiThreadId) -> Result<(), WasiError> {
std::thread::yield_now();
Ok(())
}
fn getpid(&self) -> Option<u32> {
None
}
}
#[derive(Debug)]
pub struct PluggableRuntimeImplementation {
pub bus: Box<dyn VirtualBus + Sync>,
pub networking: Box<dyn VirtualNetworking + Sync>,
pub thread_id_seed: AtomicU32,
}
impl PluggableRuntimeImplementation {
pub fn set_bus_implementation<I>(&mut self, bus: I)
where
I: VirtualBus + Sync,
{
self.bus = Box::new(bus)
}
pub fn set_networking_implementation<I>(&mut self, net: I)
where
I: VirtualNetworking + Sync,
{
self.networking = Box::new(net)
}
}
impl Default for PluggableRuntimeImplementation {
fn default() -> Self {
Self {
#[cfg(not(feature = "host-vnet"))]
networking: Box::new(wasmer_vnet::UnsupportedVirtualNetworking::default()),
#[cfg(feature = "host-vnet")]
networking: Box::new(wasmer_wasi_local_networking::LocalNetworking::default()),
bus: Box::new(UnsupportedVirtualBus::default()),
thread_id_seed: Default::default(),
}
}
}
impl WasiRuntimeImplementation for PluggableRuntimeImplementation {
fn bus(&self) -> &(dyn VirtualBus) {
self.bus.deref()
}
fn networking(&self) -> &(dyn VirtualNetworking) {
self.networking.deref()
}
fn thread_generate_id(&self) -> WasiThreadId {
self.thread_id_seed.fetch_add(1, Ordering::Relaxed).into()
}
}