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use std::future::Future;
use std::io::BufReader;
use std::marker::PhantomData;
use std::pin::Pin;
use std::task::{Context, Poll, Waker};
use serde::{Deserialize, de::DeserializeOwned};
use assemblylift_core_io_common::constants::{FUNCTION_INPUT_BUFFER_SIZE, IO_BUFFER_SIZE_BYTES};
extern "C" {
fn __asml_abi_io_poll(id: u32) -> i32;
fn __asml_abi_io_len(id: u32) -> u32;
fn __asml_abi_io_load(id: u32) -> i32;
fn __asml_abi_io_next() -> i32;
fn __asml_abi_clock_time_get() -> u64;
fn __asml_abi_console_log(ptr: *const u8, len: usize);
fn __asml_abi_input_start() -> i32;
fn __asml_abi_input_next() -> i32;
fn __asml_abi_input_length_get() -> u64;
fn __asml_expabi_z85_encode(ptr: *const u8, len: usize, out_ptr: *const u8) -> i32;
fn __asml_expabi_z85_decode(ptr: *const u8, len: usize, out_ptr: *const u8) -> i32;
}
pub static mut IO_BUFFER: [u8; IO_BUFFER_SIZE_BYTES] = [0; IO_BUFFER_SIZE_BYTES];
#[no_mangle]
pub fn __asml_guest_get_io_buffer_pointer() -> *const u8 {
unsafe { IO_BUFFER.as_ptr() }
}
fn console_log(message: String) {
unsafe { __asml_abi_console_log(message.as_ptr(), message.len()) }
}
pub fn get_time() -> u64 {
unsafe { __asml_abi_clock_time_get() }
}
pub struct IoDocument {
bytes_read: usize,
pages_read: usize,
length: usize,
}
impl IoDocument {
pub fn new(ioid: u32) -> Self {
unsafe { __asml_abi_io_load(ioid) };
Self {
bytes_read: 0,
pages_read: 0,
length: unsafe { __asml_abi_io_len(ioid) } as usize,
}
}
pub fn len(&self) -> usize {
self.length
}
}
impl std::io::Read for IoDocument {
fn read(&mut self, buf: &mut [u8]) -> Result<usize, std::io::Error> {
let mut bytes_read = 0usize;
if self.bytes_read < self.length {
for idx in 0..std::cmp::min(self.length, buf.len()) {
buf[idx] = unsafe {
IO_BUFFER[self.bytes_read % IO_BUFFER_SIZE_BYTES]
};
bytes_read += 1;
self.bytes_read += 1;
if self.bytes_read % IO_BUFFER_SIZE_BYTES == 0 {
unsafe { __asml_abi_io_next() };
self.pages_read += 1;
}
}
}
Ok(bytes_read)
}
}
#[derive(Clone)]
pub struct Io<'a, R> {
pub id: u32,
waker: Box<Option<Waker>>,
_phantom: PhantomData<&'a R>,
}
impl<'a, R: Deserialize<'a>> Io<'_, R> {
pub fn new(id: u32) -> Self {
Io {
id,
waker: Box::new(None),
_phantom: PhantomData,
}
}
}
impl<'a, R> Future for Io<'_, R>
where
R: DeserializeOwned,
{
type Output = R;
fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
match unsafe { __asml_abi_io_poll(self.id) } {
1 => Poll::Ready(read_response::<Self::Output>(self.id).unwrap()),
_ => {
self.waker = Box::new(Some(cx.waker().clone()));
Poll::Pending
}
}
}
}
fn read_response<'a, T>(id: u32) -> Option<T>
where
T: DeserializeOwned,
{
let doc = IoDocument::new(id);
let doc = BufReader::with_capacity(doc.len(), doc);
match serde_json::from_reader::<BufReader<IoDocument>, T>(doc) {
Ok(response) => Some(response),
Err(why) => {
console_log(format!("[ERROR] ioid={} {}", id, why.to_string()));
None
}
}
}
pub static mut FUNCTION_INPUT_BUFFER: [u8; FUNCTION_INPUT_BUFFER_SIZE] =
[0; FUNCTION_INPUT_BUFFER_SIZE];
#[no_mangle]
pub fn __asml_guest_get_function_input_buffer_pointer() -> *const u8 {
unsafe { FUNCTION_INPUT_BUFFER.as_ptr() }
}
pub struct FunctionInputBuffer {
bytes_read: usize,
pages_read: usize,
length: usize,
}
impl FunctionInputBuffer {
pub fn new() -> Self {
unsafe { __asml_abi_input_start() };
Self {
bytes_read: 0usize,
pages_read: 0usize,
length: unsafe { __asml_abi_input_length_get() as usize },
}
}
}
impl std::io::Read for FunctionInputBuffer {
fn read(&mut self, buf: &mut [u8]) -> Result<usize, std::io::Error> {
let mut bytes_read = 0usize;
if self.bytes_read < self.length {
for idx in 0..std::cmp::min(self.length, buf.len()) {
buf[idx] = unsafe {
FUNCTION_INPUT_BUFFER[self.bytes_read % FUNCTION_INPUT_BUFFER_SIZE]
};
bytes_read += 1;
self.bytes_read += 1;
if self.bytes_read % FUNCTION_INPUT_BUFFER_SIZE == 0 {
unsafe { __asml_abi_input_next() };
self.pages_read += 1;
}
}
}
Ok(bytes_read)
}
}